1. The utility model provides an air flue tumble adjusting device, includes the cylinder cap, the cylinder cap is including being used for corresponding the inlet structure of intercommunication with the cylinder, inlet structure includes two at least intake ducts, a serial communication port, air flue tumble adjusting device still includes movable mounting in each guider in the intake duct and be used for detachably shutoff the block structure of intake duct, guider is located the intake duct is close to the one end of (air) intake valve, guider is including relative the bellied protruding structure of water conservancy diversion of the wall of intake duct, the protruding structure of water conservancy diversion is in the circumference position of intake duct is adjustable.

2. The device for adjusting the tumble flow of the air passage according to claim 1, wherein said guiding means comprises a mounting ring movably fitted to the inner wall of said air inlet, and said guide protrusion is a guide baffle fixedly connected to the inner side of said mounting ring.

3. The device for adjusting the tumble flow of the air flue according to claim 2, wherein the edge of the side of the diversion baffle facing the center of the air inlet is an arc-shaped edge, a straight edge or a zigzag edge.

4. The airway tumble adjusting device according to claim 3, wherein said guiding baffle is a crescent-shaped plate with its concave side arranged toward the center of said inlet.

5. The airway tumble adjusting device according to claim 1, characterized in that said guiding device is rotatably disposed in said air intake duct or detachably disposed in said air intake duct.

6. The airway tumble flow adjusting device according to claim 5, characterized in that said cylinder head is provided with a locking device for locking the position of said guiding device in said intake passage.

7. The air passage tumble flow adjusting device according to claim 6, characterized in that a locking threaded hole communicated to the inner wall of the air inlet passage is formed in the outer side of the cylinder cover, and the locking device is a set screw matched with the locking threaded hole.

8. The air passage tumble flow adjusting device according to claim 1, characterized in that the opening of the air inlet passage on the bottom surface of the cylinder head is an air inlet throat, and an angle scale mark for indicating the installation angle of the guide device is arranged in the circumferential direction of the outer end surface of the air inlet throat.

9. The device for adjusting the tumble flow of the air passage according to claim 1, wherein the opening of the air inlet passage on the bottom surface of the cylinder head is an air inlet throat, and the blocking structure is a sealing plate capable of covering the air inlet throat.

10. A testing device comprises a test bed, a simulation cylinder sleeve and a momentum moment instrument, wherein the simulation cylinder sleeve is connected below the test bed, the momentum moment instrument is positioned in the simulation cylinder sleeve and used for detecting the tumble strength and the tumble direction in the simulation cylinder sleeve, and the device is characterized by further comprising the air passage tumble adjusting device as claimed in any one of claims 1 to 9.

11. A test method applied to the test apparatus according to claim 10, comprising the steps of:

setting a plurality of different installation angles of the flow guide protruding structure in each air inlet in the air inlet structure;

conducting one air inlet channel in the air inlet structure, and plugging the other air inlet channels in the air inlet structure by using the plugging structure;

gradually adjusting the flow guide protruding structures in the communicated air inlet channel to different installation angles, carrying out air blowing test after adjusting the installation angles once, and respectively recording the tumble strength and the tumble direction corresponding to each installation angle;

conducting the rest air inlet channels in the air inlet structure successively and returning to the previous step respectively to perform air blowing test on the conducted air inlet channels, and obtaining individual test results of all the air inlet channels of the air inlet structure after completing the air blowing test on all the air inlet channels, wherein each individual test result comprises the corresponding relation between the tumble strength and each installation angle and the corresponding relation between the tumble direction and each installation angle;

and superposing the individual test results of each air inlet channel, wherein the superposed part of the tumble directions of the individual test results is the target tumble direction, and the mounting angle corresponding to the target tumble direction is the first target mounting angle of each flow guide bulge structure.

12. The test method according to claim 11, wherein within the range of the target tumble direction, the installation angle corresponding to the tumble intensity greater than or equal to the preset intensity is a second target installation angle of each guide projection structure.

Background

The air flow movement form in the cylinder of the internal combustion engine has decisive influence on the formation and the combustion process of the mixed gas, meanwhile, the combustion quality in the cylinder deeply influences the indexes of the engine such as dynamic property, economical efficiency and emission, and good air flow organization has important effects on improving the combustion rate and improving the mixing of air and unburned fuel in the cylinder. For a gas engine or a gasoline engine, the appropriate tumble strength is favorable for improving the flame propagation rate in a cylinder and inhibiting combustion cycle variation, the momentum attenuation of the tumble is small in the compression process, the tumble can be reserved to the end of a compression stroke, and the large-scale tumble is broken into a plurality of small-scale turbulences along with the progress of the compression stroke, so that the turbulence strength and the turbulence energy are increased, the in-cylinder combustion is favorably improved, and the engine performance is improved.

At present, the formation mode of tumble has a plurality of, and traditional tumble forms and relies on the shape and the arrangement form of intake duct, commonly uses the mode of two tangential air ducts in the current engine, and the tumble intensity and the direction that each air duct formed are fixed, can't adjust in certain extent. In the process of developing the cylinder cover, in order to achieve the highest tumble strength in the cylinder and enable the tumble directions generated by the air inlet channels to be consistent, an air passage core box needs to be manufactured in advance for a blow test, and then the air passage core box is repeatedly repaired according to the blow test result. Therefore, the cylinder cover development process in the prior art is difficult to change the tumble direction and tumble strength of multiple air passages, and has the defects of high difficulty and low efficiency.

Therefore, how to realize the function of adjusting the tumble strength and the tumble direction of the air passages and how to more conveniently and quickly determine the tumble strength and the tumble direction of the multiple air passages is a technical problem which needs to be solved by the technical personnel in the field at present.

Disclosure of Invention

In view of this, the present invention provides an air passage tumble adjusting device, which can achieve independent adjustment of tumble strength and tumble direction of each air inlet passage, and reduce difficulty in development and design of a cylinder head. Another objective of the present invention is to provide a testing apparatus and a testing method.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides an air flue tumble adjusting device, includes the cylinder cap, the cylinder cap is including being used for corresponding the inlet structure of intercommunication with the cylinder, inlet structure includes two at least intake ducts, air flue tumble adjusting device still includes movable mounting in each guider in the intake duct and be used for detachably shutoff the block structure of intake duct, guider is located the intake duct is close to the one end of (air) intake valve, guider is including relative the bellied water conservancy diversion protruding structure of wall of intake duct, the protruding structure of water conservancy diversion is in the circumference position of intake duct is adjustable.

Preferably, the guiding device comprises a mounting ring movably matched with the inner wall of the air inlet channel, and the flow guide protruding structure is a flow guide baffle fixedly connected to the inner side of the mounting ring.

Preferably, the edge of the guide baffle facing to the center side of the air inlet channel is an arc-shaped edge, a straight edge or a fold-line-shaped edge.

Preferably, the flow guide baffle is a crescent plate with a concave side facing the center of the air inlet channel.

Preferably, the guiding device is rotatably arranged in the air inlet channel or detachably arranged in the air inlet channel.

Preferably, the cylinder head is provided with locking means for locking the position of the guide means in the intake duct.

Preferably, the outer side of the cylinder cover is provided with a locking threaded hole communicated to the inner wall of the air inlet channel, and the locking device is a set screw matched with the locking threaded hole.

Preferably, the inlet duct is in the opening of the bottom surface of cylinder cap is the throat that admits air, the circumference of the outer terminal surface of the throat that admits air is provided with and is used for instructing guider's installation angle's angle scale sign.

Preferably, the inlet duct is in the opening of the bottom surface of cylinder cap is the throat mouth that admits air, block structure is for can covering the sealing plate of throat mouth that admits air.

The invention provides an air passage tumble adjusting device which comprises a cylinder cover, wherein the cylinder cover comprises an air inlet structure which is correspondingly communicated with a cylinder, the air inlet structure comprises at least two air inlet channels, the air passage tumble adjusting device also comprises a guide device which is movably arranged in each air inlet channel and a blocking structure which is used for detachably blocking the air inlet channels, the guide device is positioned at one end, close to an air inlet valve, of each air inlet channel, the guide device comprises a flow guide protruding structure protruding relative to the wall surface of each air inlet channel, and the circumferential position of the flow guide protruding structure in each air inlet channel is adjustable.

The test process of the airway tumble adjusting device provided by the invention is as follows:

firstly, set for the protruding structure's of water conservancy diversion of every intake duct a plurality of different installation angles in the air inlet structure, then, switch on an intake duct in the air inlet structure, and utilize the shutoff structure with all the other intake ducts shutoff in this air inlet structure, the intake duct that switches on is the intake duct that awaits measuring, during the test, adjust the protruding structure of water conservancy diversion in the intake duct that will switch on to different installation angles one by one, carry out the test of once blowing after the installation angle of every adjustment, and record respectively every installation angle and the tumble intensity and the tumble direction that correspond, to this end, the multi-angle test process of the intake duct that awaits measuring has been accomplished. And then, conducting the rest air inlet channels in the air inlet structure one by one, respectively conducting blowing tests on the conducted air inlet channels according to the test process, and after the blowing tests are completed on the air inlet channels, obtaining individual test results of the air inlet channels of the air inlet structure, wherein each individual test result comprises the corresponding relation between the tumble strength and each installation angle and the corresponding relation between the tumble direction and each installation angle. And finally, overlapping the individual test results of each air inlet channel, wherein the overlapped part of the tumble direction of each individual test result is the target tumble direction, and the installation angle corresponding to the target tumble direction is the target installation angle of each flow guide bulge structure. When the cylinder cover is designed and developed, the flow guide protruding structures are arranged in the corresponding air inlet channels according to respective target installation angles, so that the air inlet channel arrangement structure of the cylinder cover can be determined, the rolling directions generated by the air inlet channels can be consistent, and the rolling strength can be further improved in the cylinder.

Therefore, the invention can realize the independent adjustment of the tumble strength and the tumble direction of the air inlet passage by arranging the guide device in the air inlet passage, can realize the superposition of the intake tumble strength and the adjustment of the tumble direction by respectively adjusting the installation angle of the flow guide protruding structure for a multi-inlet valve type, and can determine the optimal tumble ratio and tumble direction through the blowing test.

The invention also provides a testing device which comprises a test bench, a simulation cylinder sleeve and a momentum moment instrument, wherein the simulation cylinder sleeve is connected below the test bench, the momentum moment instrument is positioned in the simulation cylinder sleeve and used for detecting the tumble strength and the tumble direction in the simulation cylinder sleeve, and the testing device also comprises the air passage tumble adjusting device. The derivation process of the beneficial effect generated by the blowing test device is substantially similar to the derivation process of the beneficial effect brought by the air passage tumble ratio quick adjustment device, and therefore the description is omitted here.

The invention also provides a test method applied to the test device, and the test method comprises the following steps:

setting a plurality of different installation angles of the flow guide protruding structure in each air inlet in the air inlet structure;

conducting one air inlet channel in the air inlet structure, and plugging the other air inlet channels in the air inlet structure by using the plugging structure;

gradually adjusting the flow guide protruding structures in the communicated air inlet channel to different installation angles, carrying out air blowing test after adjusting the installation angles once, and respectively recording the tumble strength and the tumble direction corresponding to each installation angle;

conducting the rest air inlet channels in the air inlet structure successively and returning to the previous step respectively to perform air blowing test on the conducted air inlet channels, and obtaining individual test results of all the air inlet channels of the air inlet structure after completing the air blowing test on all the air inlet channels, wherein each individual test result comprises the corresponding relation between the tumble strength and each installation angle and the corresponding relation between the tumble direction and each installation angle;

and superposing the individual test results of each air inlet channel, wherein the superposed part of the tumble directions of the individual test results is the target tumble direction, and the mounting angle corresponding to the target tumble direction is the first target mounting angle of each flow guide bulge structure.

Preferably, in the range of the target tumble direction, the installation angle corresponding to the tumble strength greater than or equal to the preset strength is the second target installation angle of each flow guide protrusion structure.

By the testing method, the installation angle of each flow guide protrusion structure in each air inlet channel can be quickly determined, and the optimal tumble ratio and tumble direction of each air inlet channel can be determined. When the engine cylinder cover of a multi-inlet-valve type is developed, repeated mould repairing is not needed for the cylinder cover structure, the testing efficiency is greatly improved, and the development design difficulty and the design cost of the cylinder cover are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of two inlet channels and a guide protrusion structure according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating the tumble direction definitions of two inlet ducts according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating a correspondence relationship between a tumble direction and a strength of a first air inlet and an installation angle of a first guide protrusion structure according to an embodiment of the present disclosure;

FIG. 4 is a diagram illustrating a correspondence relationship between a tumble direction and a strength of a second air inlet and an installation angle of a second guide protrusion structure according to an embodiment of the present disclosure;

FIG. 5 is a superimposed correspondence between FIGS. 3 and 4;

FIG. 6 is a schematic diagram of an external structure of an airway tumble adjusting device according to an embodiment of the present invention;

FIG. 7 is a longitudinal cross-sectional view of an airway tumble flow regulating device in an embodiment of the present invention;

FIG. 8 is a schematic view of a locking device locking the mounting angle of a valve seat insert in an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a blocking structure and an intake valve connected to a cylinder head according to an embodiment of the present invention;

FIG. 10 is a longitudinal cross-sectional view of a valve seat insert in an embodiment of the present invention;

FIG. 11 is a schematic view of a projection of a first flow guide protrusion structure on an upper end surface of a valve seat ring according to an embodiment of the present invention.

The meaning of the individual reference numerals in fig. 1 to 11 is as follows:

1-a first air inlet channel, 2-a first guide bulge structure, 3-a second air inlet channel, 4-a second guide bulge structure, 5-an air cylinder, 10-angle scale marks, 100-a central connecting line of two air inlet valves, 6-a cylinder cover, 61-a cylinder cover air inlet, 62-a locking threaded hole, 7-an air inlet valve, 8-an air valve seat ring, 9-a set screw, 81-an indication mark, 11-a first air inlet channel center, 12-a blocking structure, 21-a convex projection and 22-a convex characteristic line.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 11, fig. 1 is a schematic view of two air inlets and a flow guide protrusion structure according to an embodiment of the invention; FIG. 2 is a schematic diagram illustrating the tumble direction definitions of two inlet ducts according to an embodiment of the present invention; FIG. 3 is a diagram illustrating a correspondence relationship between a tumble direction and a strength of a first air inlet and an installation angle of a first guide protrusion structure according to an embodiment of the present disclosure; FIG. 4 is a diagram illustrating a correspondence relationship between a tumble direction and a strength of a second air inlet and an installation angle of a second guide protrusion structure according to an embodiment of the present disclosure; FIG. 5 is a superimposed correspondence between FIGS. 3 and 4; fig. 6 and 7 are an external structural schematic view and a longitudinal sectional view of an airway tumble adjusting apparatus according to an embodiment of the present invention, respectively; FIG. 8 is a schematic view of a locking device locking the mounting angle of a valve seat insert in an embodiment of the present invention; FIG. 9 is a schematic structural diagram of a blocking structure and an intake valve connected to a cylinder head according to an embodiment of the present invention; FIG. 10 is a longitudinal cross-sectional view of a valve seat insert in an embodiment of the present invention; FIG. 11 is a schematic view of a projection of a first flow guide protrusion structure on an upper end surface of a valve seat ring according to an embodiment of the present invention.

In order to realize the independent adjustment of the tumble strength and the tumble direction of each air inlet channel, the development and design difficulty of the cylinder cover is reduced. The invention provides an air passage tumble adjusting device which comprises a cylinder cover 6, wherein the cylinder cover 6 comprises an air inlet structure which is correspondingly communicated with an air cylinder 5, the air inlet structure comprises at least two air inlet channels, a cylinder cover air inlet 61 (namely an air inlet of the air inlet channel) which is communicated with each air inlet channel is further arranged on the outer side of the cylinder cover 6, an opening of each air inlet channel on the bottom surface of the cylinder cover 6 is an air inlet throat for air inlet airflow to enter the air cylinder 5, it needs to be noted that the cylinder cover 6 in the scheme is a cylinder cover model which is made when a cylinder cover product is designed and developed, specifically, an air passage core box structure can be adopted, and the air inlet channels and a guide bulge structure inside the air inlet channels are determined to be used as the structure of the cylinder cover product. The air passage tumble adjusting device further comprises a guide device movably mounted in each air inlet passage and a plugging structure 12 used for detachably plugging the air inlet passage, the guide device is located at one end, close to the air inlet valve 7, of the air inlet passage, the guide device comprises a guide protruding structure protruding relative to the wall surface of the air inlet passage, and the guide protruding structure is adjustable in the circumferential position of the air inlet passage. It should be noted that the air passage tumble adjusting device may further include a valve seat 8 and an intake valve 7, that is, each intake passage may be installed with one valve seat 8 and one intake valve 7, the intake valve 7 is used in cooperation with the valve seat 8, and when a blowing test is performed, the intake valve 7 is opened according to a certain valve lift, so as to facilitate simulation of a real intake air flow condition. In the blow test, the intake air flow enters the intake passage from the head intake port 61 and then enters the simulated cylinder 5 (i.e., the simulated liner) from the intake throat at the other end of the intake passage.

The test process of the airway tumble adjusting device provided by the invention is as follows:

firstly, set for the protruding structure's of water conservancy diversion of every intake duct a plurality of different installation angles in the air inlet structure, then, switch on an intake duct in the air inlet structure, and utilize the shutoff structure 12 with all the other intake ducts shutoff in this air inlet structure, the intake duct that switches on is the intake duct that awaits measuring, during the test, adjust the protruding structure of water conservancy diversion in the intake duct that switches on to different installation angles one by one, carry out the test of once blowing after the installation angle of every adjustment, and record the tumble intensity and the tumble direction that every installation angle corresponds respectively, so far, the multi-angle test process of the intake duct that awaits measuring has been accomplished. And then, conducting the rest air inlet channels in the air inlet structure one by one, respectively conducting blowing tests on the conducted air inlet channels according to the test process, and after the blowing tests are completed on the air inlet channels, obtaining individual test results of the air inlet channels of the air inlet structure, wherein each individual test result comprises the corresponding relation between the tumble strength and each installation angle and the corresponding relation between the tumble direction and each installation angle. And finally, overlapping the individual test results of each air inlet channel, wherein the overlapped part of the tumble direction of each individual test result is the target tumble direction, and the installation angle corresponding to the target tumble direction is the target installation angle of each flow guide bulge structure. When the cylinder cover is designed and developed, the flow guide protruding structures are arranged in the corresponding air inlet channels according to respective target installation angles, so that the air inlet channel arrangement structure of the cylinder cover can be determined, the rolling directions generated by the air inlet channels can be consistent, and the rolling strength can be further improved in the cylinder.

Therefore, the invention can realize the independent adjustment of the tumble strength and the tumble direction of the air inlet passage by arranging the guide device in the air inlet passage, can realize the superposition of the intake tumble strength and the adjustment of the tumble direction by respectively adjusting the installation angle of the flow guide protruding structure for a multi-inlet valve type, and can determine the optimal tumble ratio and tumble direction through the blowing test.

It should be noted that the guiding device of the present invention can be designed in various forms, such as a rotatable mounting ring at the end of the inlet and a baffle plate at the inner side of the mounting ring, or a flow guiding protrusion structure at the inner wall of the valve seat 8 in the inlet throat, etc. Preferably, the guiding device in this scheme includes the collar with the inner wall clearance fit of intake duct, and the protruding structure of water conservancy diversion is for linking firmly the water conservancy diversion baffle in the collar inboard. This water conservancy diversion baffle extends along the central direction to the intake duct by the inner wall of intake duct, and on the direction of admitting air, water conservancy diversion baffle makes the circulation cross-section of intake duct diminish to form the water conservancy diversion structure that can extrude or throw the air current of admitting air. In another preferred scheme, the valve seat ring 8 is used as a guide device, the guide protrusion structure is designed to be a tumble sharp-angle structure integrated on the inner side of the valve seat ring 8, as shown in fig. 7 to 10, the tumble sharp-angle structure protrudes towards the center direction of the valve seat ring relative to the inner wall of the valve seat ring 8, so that intake airflow is extruded and guided, the intake airflow forms two asymmetric airflows at the tail end of the intake passage, namely, when passing through a gap between the intake valve 7 and the valve seat ring 8, the intake airflow is guided and cast to the maximum, and further, tumble motion is facilitated to be formed.

It should be noted that the guide protrusion structure of the present invention may be integrally formed with the guide device, for example, by integral casting, forging, or machining, so that the guide protrusion structure and the guide device are an integral structure.

It should be noted that the structure of the flow guide baffle may be designed into various structural shapes, and in this embodiment, the edge of the flow guide baffle facing the center of the air inlet is designed into an arc-shaped edge, a straight-line-shaped edge, a zigzag-shaped edge, or other curved edges. Specifically, the projection of the diversion baffle on the upper end surface of the air inlet throat is a convex projection 21, and in the scheme, one side edge of the convex projection 21 facing the center of the air inlet channel is defined as a convex characteristic line 22, as shown in fig. 11, in the first air inlet channel 1, the convex projection 21 forms a convex area which is convex from the inner side edge of the air inlet throat to the center of the air inlet throat (namely, the center 11 of the first air inlet channel) along the radial direction, and the width of the middle part of the convex projection 21 in the circumferential direction of the air inlet throat is greater than the width of the two ends of the convex projection. The raised feature lines 22 may be configured as arcs, lines, folds, or other curvilinear configurations. Preferably, this scheme designs the water conservancy diversion baffle as crescent moon shaped plate, and the indent side of crescent moon shaped plate is arranged towards the center of intake duct, i.e. as shown in fig. 11, in first intake duct 1, protruding projection 21 is crescent moon region, and the indent side of crescent moon region is arranged towards first intake duct center 11.

To the scheme that the tumble closed angle is arranged on the inner side of the valve seat ring 8, it needs to be explained that the tumble closed angle specifically comprises an upper side guide surface and a lower side processing surface, the junction of the upper side guide surface and the lower side processing surface is the edge of the tumble closed angle protruding towards the center of the valve seat ring, the tumble closed angle can be designed into different structures, and the lower side processing surface can be specifically designed into a rotary processing surface, or a plurality of planes connected in sequence, or other curved surface structures and the like. Preferably, in the scheme, the lower side processing surface of the tumble closed angle is a rotary processing surface surrounding a processing axis, the processing axis can be designed to be superposed with, parallel to or relatively obliquely arranged with the central line of the valve seat ring 8, and a generatrix of the rotary processing surface is a straight line, a broken line or a curve.

It should be noted that, the rotary processing surface may be specifically designed into a plurality of different tapered surface structures according to different bus shapes, and preferably, the rotary processing surface in this embodiment is a conical processing surface, a processing axis of the conical processing surface coincides with a central line of the valve seat ring 8, and a vertex of the conical processing surface is located above a lower end surface of the valve seat ring 8. The specific shape of the tumble sharp angle depends on the size of the cone angle of the conical processing surface, and the tumble sharp angle is sharper when the cone angle is larger. Preferably, the value range of the cone angle of the conical processing surface in the scheme is 60-160 degrees, and within the range, the tumble flow sharp angle can be ensured to have a sharp enough angle, so that the flow velocity mutation and the extrusion effect on the intake air flow are further strengthened.

Preferably, guider can rotate and set up in the intake duct, is convenient for adjust the installation angle of water conservancy diversion protruding structure for the intake duct, can improve efficiency of software testing greatly. Of course, the guide device can be detachably arranged in the air inlet channel, and when the installation angle needs to be adjusted, the guide device is only needed to be disassembled and then the angle is changed for installation again. In addition, through the detachable connection mode, the guide device with different inner diameters or different flow guide protruding structures can be replaced, so that different tumble generation structures can be designed in the same cylinder cover 6 structure, and the test convenience is further improved.

In order to keep the guide stationary during the test and to improve the test accuracy, the cylinder head 6 is preferably provided with locking means for locking the position of the guide in the inlet duct.

It should be noted that the locking device can be designed in various forms, for example, a screw locking manner, a cam locking manner, etc. In a preferable scheme, the outer side of the cylinder cover 6 is provided with a locking threaded hole 62 communicated to the inner wall of the intake duct, as shown in fig. 6, and the locking device is a set screw 9 matched with the locking threaded hole 62, as shown in fig. 8. After the guide device is installed in place, the installation angle of the guide device can be fixed by screwing the set screw 9.

Preferably, the opening of the air inlet channel on the bottom surface of the cylinder cover 6 is an air inlet throat, and an angle scale mark 10 for indicating the installation angle of the guide device is arranged on the circumferential direction of the outer end surface of the air inlet throat, as shown in fig. 1 and 6. Correspondingly, the lower end of the guide device is provided with an indicating mark 81 for indicating the scale, and in the solution shown in fig. 10 in which the valve seat ring 8 is used as the guide device, the lower end surface of the valve seat ring 8 is provided with the indicating mark 81. When the circumferential installation angle of the guide device relative to the air inlet channel is changed, the indication mark 81 indicates different angle scales, and an operator can conveniently set the installation angle of the guide device in the air inlet channel according to the scales indicated by the operator. Specifically, the angle scale mark 10 may be designed in the form of a plurality of scales or a plurality of scale points, and the indication mark 81 at the lower end of the guide device may also be designed in the form of a scale or a scale point. Preferably, in the scheme, the indication mark 81 is designed to be of a straight line groove structure, so that the processing is convenient, and an operator can observe the installation angle conveniently.

Preferably, the opening of the intake duct at the bottom surface of the cylinder head 6 is an intake throat, and the blocking structure 12 is a sealing plate capable of covering the intake throat. Specifically, as shown in fig. 9, the sealing plate may be connected to the bottom surface of the cylinder head 6 by rotation, sliding, or the like. Of course, the air inlet valve 7 can be used as a plugging structure, and in the process of carrying out blowing test on a certain air inlet channel, the air inlet throats of other air inlet channels are sealed by the air inlet valve, so that plugging of other air inlet channels can be realized.

Preferably, the outer side of the cylinder cover 6 is provided with a mounting structure which is detachably connected and fixed with the test bed. Specifically, the mounting structure may be designed as a bolt connection structure, or a clip type quick-release structure, etc.

The following describes a test procedure of the airway tumble flow adjusting apparatus according to the present invention by using a specific example.

As shown in fig. 1, the air intake structure of the cylinder cover 6 corresponding to the cylinder 5 includes two air intake channels, which are a first air intake channel 1 and a second air intake channel 3, the two air intake channels form a bi-tangential air passage structure, guide devices are disposed in the two air intake channels, the guide devices can rotate 360 degrees along the circumferential direction of the inner wall of each air intake channel, so as to adjust the guiding direction of the intake air flow, the guide protrusion structure in the first air intake channel 1 is a first guide protrusion structure 2, the guide protrusion structure in the second air intake channel 3 is a second guide protrusion structure 4, and the position of the specified line perpendicular to the central line 100 of the two intake valves in fig. 1 is 0 degree as the starting point. Referring to fig. 2, the tumble direction is defined as that, in fig. 2, the central connecting line 100 of the two intake valves is taken as a reference, the normal direction is 0 ° direction, the rotation from 0 ° direction along the counterclockwise direction is defined as a square, the rotation from 0 ° direction along the clockwise direction is defined as a negative direction, the maximum value of the rotation angle in each direction is 180 °, in fig. 2, the tumble direction angle of the first intake passage 1 is defined as θ 1, and the tumble direction angle of the second intake passage 3 is defined as θ 2.

As can be seen from fig. 1 and 2, rotating the first guide protrusion structure 2 and the second guide protrusion structure 4 in fig. 1 may affect the tumble direction and the tumble strength of the two air inlets to different degrees. The air inlets in fig. 1 are respectively subjected to a blowing test, and a corresponding relationship between the tumble direction and tumble intensity of each air inlet and the installation angle of the guide protrusion structure can be obtained, as shown in fig. 3 and 4, fig. 3 represents a blowing test result of the first air inlet 1 after the second air inlet 3 in fig. 1 is plugged, fig. 4 represents a blowing test result of the second air inlet 3 after the first air inlet 1 in fig. 1 is plugged, the abscissa in fig. 3 and 4 is the installation angle of the guide protrusion structure in each air inlet, the ordinate is the tumble direction in each air inlet, and the size of each data point in the figure represents tumble intensity, that is, the larger the area of the data point represents the larger the tumble intensity, and the smaller the area of the data point represents the smaller the tumble intensity.

After the two blowing test results of fig. 3 and fig. 4 are superimposed, the comprehensive blowing test result of the air intake structure shown in fig. 5 is obtained, and the hatched portion in fig. 5 represents the angular range of the tumble direction corresponding to the overlapping portion of the blowing test results of the first air intake duct 1 and the second air intake duct 3, that is, the partial test result with the tumble directions of the two air intake ducts being identical represents that the tumble directions of the two air intake ducts can be unified by adjusting the position of the flow guide protrusion structure. As can be seen from fig. 5, when the tumble directions generated by the first air inlet duct 1 and the second air inlet duct 3 are in the range of 60 ° to 80 °, the tumble intensities may be superimposed and further enhanced, where the diamond data points in fig. 5 represent the tumble direction and the tumble intensity corresponding to the first air inlet duct, and the circular data points represent the tumble direction and the tumble intensity corresponding to the second air inlet duct. It can be seen that, in fig. 5, the portions (within a range of 60 ° -80 °) where the tumble directions of the two air inlets are consistent include three circular data points and one diamond data point, and further, it is found through observation and analysis that the diamond data point represents that the tumble direction generated in the cylinder when the first flow guide projection structure 2 is at the installation angle of 270 ° is 76 °, and the circular data point closest to the diamond data point represents that the tumble direction generated in the cylinder when the second flow guide projection structure 4 is at the installation angle of 240 ° is 75 °, so that the installation angle of the first flow guide projection structure 2 can be determined to be 270 °, the installation angle of the second flow guide projection structure 4 can be determined to be 240 °, and then the tumble directions generated by the two air inlets can be substantially the same, thereby further enhancing the tumble strength. Assuming that the intensity of in-cylinder tumble flow generated by the first intake passage 1 in fig. 1 is α and the intensity of in-cylinder tumble flow generated by the second intake passage 3 is β, the total in-cylinder tumble flow intensity ∈ at this time can be represented by the following equation (1):

（1）

according to the test process, the air passage tumble adjusting device provided by the invention can respectively adjust the tumble direction and the tumble strength generated by each air inlet channel in a mode of adjusting the guide device in each air inlet channel, and can realize the effect of changing the tumble strength and the tumble direction under different working conditions by utilizing the superposition effect of the tumble direction and the tumble strength of each air inlet channel, so that the optimum tumble ratio and the tumble direction in a cylinder are obtained, and great help is provided for improving the emission characteristic of an engine and the fuel economy.

The invention also provides a testing device which comprises the test bed, the simulation cylinder sleeve and the momentum moment instrument, wherein the simulation cylinder sleeve is connected below the test bed, the momentum moment instrument is positioned in the simulation cylinder sleeve and used for detecting the tumble strength and the tumble direction in the simulation cylinder sleeve, and the testing device also comprises the air passage tumble adjusting device. The test bed is used for supporting the air passage tumble adjusting device, so that the cylinder cover 6 to be measured is communicated with the simulation cylinder sleeve below the cylinder cover. The simulation cylinder sleeve is connected to the air suction device through a pressure stabilizing cylinder, an exhaust pipeline and other devices, and when the air blowing test is carried out, the air suction device generates negative pressure in the simulation cylinder sleeve through the exhaust pipeline, so that air inflow can flow into the simulation cylinder sleeve through an air inlet channel of the cylinder cover 6 to be tested.

The derivation process of the beneficial effects of the blowing test device provided by the invention is substantially similar to the derivation process of the beneficial effects brought by the air passage tumble ratio quick adjustment device, so that the details are not repeated herein.

The invention also provides a test method applied to the test device, and the test method comprises the following steps:

1) setting a plurality of different installation angles of the flow guide protrusion structure in each air inlet channel in the air inlet structure, for example, setting the angle of each rotation adjustment of the flow guide protrusion structure to be 30 degrees, wherein the installation angles of the flow guide protrusion structure to be detected include 12, which are respectively 0 degree, 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees, 180 degrees, 210 degrees, 240 degrees, 270 degrees, 300 degrees and 330 degrees;

2) conducting one air inlet channel in the air inlet structure, and plugging the other air inlet channels in the air inlet structure by using the plugging structure, for example, when the plugging structure adopts an air inlet valve, the air inlet valve of the air inlet channel to be plugged can be controlled to be in a closed state;

3) gradually adjusting the flow guide protruding structures in the communicated air inlet channel to different installation angles, carrying out air blowing test after adjusting the installation angles once, and respectively recording the tumble strength and the tumble direction corresponding to each installation angle;

4) conducting the rest air inlet channels in the air inlet structure successively and returning to the previous step 3) respectively to perform air blowing test on the conducted air inlet channels, and obtaining individual test results of the air inlet channels of the air inlet structure after the air blowing test is completed on each air inlet channel, wherein each individual test result comprises the corresponding relation between the tumble strength and each installation angle and the corresponding relation between the tumble direction and each installation angle;

5) the individual test results of each air inlet duct are superimposed, the overlapping portion of the tumble direction of each individual test result is a target tumble direction (the target tumble direction may be an angle range, for example, an angle range of 60 ° -80 ° shown in fig. 5), the installation angle corresponding to the target tumble direction is a first target installation angle of each flow guide protrusion structure, where the first target installation angle may include multiple installation angles or a section of installation angle range of each flow guide protrusion structure, for example, the first target installation angle of the first flow guide protrusion structure in fig. 5 is 270 °, and the first target installation angle of the second flow guide protrusion structure is 90 °, 210 °, and 240 °.

Preferably, in the range of the target tumble direction, the installation angle corresponding to the tumble strength greater than or equal to the preset strength is the second target installation angle of each flow guide protrusion structure. Because in the range of the target tumble direction, a plurality of installation angles of the flow guide protrusion structures may exist, and in the installation angles, by selecting a data point with tumble strength higher than a preset value, the tumble strength generated by the whole air inlet structure after the two air inlet channels are superposed can be further improved. For example, in fig. 5, the tumble strength generated when the first target installation angle of the second guide projection structure is 210 ° and 240 ° is significantly greater than the tumble strength generated when it is at 90 °, and thus 210 ° and 240 ° may be determined as the preferred target installation angle of the second guide projection structure, i.e., the second target installation angle.

By the testing method, the installation angle of each flow guide bulge structure in each air inlet channel can be quickly determined, the optimal tumble ratio and tumble direction of each air inlet channel can be determined, and the finally determined cylinder cover structure is the structure of the developed cylinder cover product. When the engine cylinder cover of a multi-inlet-valve type is developed, repeated mould repairing is not needed for the cylinder cover structure, the testing efficiency is greatly improved, and the development design difficulty and the design cost of the cylinder cover are reduced.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.