1. The utility model provides a cylinder head, includes cylinder head air inlet, intake duct (3), throat of admitting air, exhaust throat and intake valve seat circle (4), its characterized in that, the throat of admitting air is kept away from one side edge of exhaust throat is first edge, the throat of admitting air is close to one side edge of exhaust throat is the second edge, intake duct (3) including connect in first wall (5) of first edge and connect in the second wall (6) of second edge, first wall (5) are equipped with and are located tumble closed angle (7) of intake valve seat circle (4) top, first wall (5) and/or second wall (6) are in the upper reaches of tumble closed angle (7) still are provided with the guide portion that casts in advance that is used for the flow direction of admitting air to second wall (6).

2. Cylinder head according to claim 1, characterized in that the pre-projecting flow guide is a pre-flow guide cusp (8) provided to the first wall (5).

3. A cylinder head according to claim 2, characterized in that the pre-flow cusp (8) extends in a direction parallel to the bottom surface of the cylinder head (1) or obliquely in a direction towards the bottom surface of the cylinder head (1), and the tumble cusp (7) extends in a direction parallel to the bottom surface of the cylinder head (1) or obliquely in a direction away from the bottom surface of the cylinder head (1).

4. The cylinder head according to claim 2 or 3, characterized in that the distance between the end of the pre-diversion cusp (8) and the centre line of the intake valve seat insert (4) is 1.5 to 3 times the inner diameter of the intake valve seat insert (4).

5. The cylinder head according to claim 1, characterized in that the pre-cast flow guide is an arching structure formed by arching the first wall surface (5) or the second wall surface (6) in a direction away from the bottom surface of the cylinder head (1).

6. A cylinder head according to claim 1, characterized in that the first wall surface (5) and the second wall surface (6) are each arched away from the bottom surface of the cylinder head (1) to form an arching structure.

7. A cylinder head according to claim 6, characterized in that the head inlet opening is provided in the top face of the cylinder head (1), and the inlet duct (3) comprises an inlet section connected upstream of the arching structure, which inlet section extends towards the bottom face of the cylinder head (1).

8. A cylinder head according to claim 6, characterized in that the head inlet port is provided in a side face of the cylinder head (1), an end face of the head inlet port being perpendicular to a bottom face of the cylinder head (1), or the end face of the inlet port being arranged obliquely towards the bottom face of the cylinder head (1).

9. The cylinder head according to any one of claims 1 to 3 and 5 to 8, characterized in that a section of the intake passage (3) near the intake throat is a tumble guide section (9), the tumble guide section (9) is arranged obliquely with respect to the bottom surface of the cylinder head (1), while a plane passing through the axis of the intake throat and the axis of the exhaust throat is a vertical feature plane, an intersection of the portion of the second wall surface (6) located in the tumble guide section (9) and the vertical feature plane is a wall surface feature line (10), and the wall surface feature line (10) is a straight line inclined with respect to the bottom surface of the cylinder head (1).

10. The cylinder head according to claim 9, characterized in that the portion of the second wall surface (6) located within the tumble guiding section (9) has a maximum distance from the bottom surface of the cylinder head (1) of 0.8 to 1.5 times the inner diameter of the intake valve seat insert (4).

11. The cylinder head according to claim 9, characterized in that the wall surface characteristic line (10) makes an angle of 40 ° to 80 ° with the bottom surface of the cylinder head (1).

12. The cylinder head according to any one of claims 1 to 3 and 5 to 8, wherein a section of the intake passage (3) near the intake throat is a tumble guide section (9), the tumble guide section (9) is arranged obliquely with respect to the bottom surface of the cylinder head (1), while a plane passing through the axis of the intake throat and the axis of the exhaust throat is a vertical characteristic plane, an intersection of the portion of the second wall surface (6) located in the tumble guide section (9) and the vertical characteristic plane is a wall surface characteristic line (10), and the wall surface characteristic line (10) is an arc line protruding toward the bottom surface of the cylinder head (1).

13. The cylinder head according to claim 12, characterized in that the projection of the portion of the second wall surface (6) located in the tumble flow guiding section (9) on the bottom surface of the cylinder head (1) has a length 1 to 1.5 times the inner diameter of the intake valve seat insert (4).

14. The cylinder head according to any one of claims 1 to 3, 5 to 8, 10, 11 and 13, wherein the number of the intake throats is one, two or three, and one intake port (3) is connected to each intake throat.

15. The cylinder head according to any one of claims 1 to 3, 5 to 8, 10, 11 and 13, wherein the number of the intake passages (3) is two or three, and each of the intake passages (3) is arranged separately.

16. Cylinder head according to any one of claims 1 to 3, 5 to 8, 10, 11 and 13, characterized in that the number of inlet channels (3) is two or three and that the pre-cast flow guides and/or the tumble flow cusps (7) in at least two of the inlet channels (3) are different.

17. A cylinder head according to any one of claims 1-3, 5 and 6, characterized in that the head inlet port is arranged in a side or top or bottom face of the cylinder head (1).

18. A gas engine, characterized by comprising a cylinder head (1) according to any one of claims 1-17.

Background

With the development of gas engine technology, more and more gas engines are transformed on the basis of diesel engines at present. In the case of a diesel engine, the combustion mode is diffusion combustion, and a certain degree of swirl helps the oil bundles to mix with air, thereby improving the combustion process, so that an air inlet passage in a cylinder head of the gas engine is required to organize the air flow to generate a sufficient swirl ratio during the air intake process. Wherein, the vortex refers to the gas rotational flow movement organized around the cylinder axial direction.

However, the combustion mode of the gas engine is premixed combustion, the requirement on the strength of vortex is not high, and small-scale turbulent motion is needed to form a flame wrinkle surface, so that the flame propagation speed is increased, and the heat efficiency is improved, wherein the turbulent motion refers to small rotational flow which is generated in a flow field when the air flow speed is high and has unfixed directions, and is different from laminar motion. For a gas engine, the strength of the vortex does not need to be increased, and the increase of the tumble strength in the cylinder can be beneficial to forming turbulence at the end of compression and generating enough turbulent kinetic energy when the piston moves up to the top dead center, so that the aim of optimizing combustion is fulfilled. Wherein, the tumble refers to the gas rotational flow motion of which the rotation central axis is vertical to the axial direction of the cylinder sleeve.

Therefore, for the existing gas engine cylinder cover which is designed by integrally modifying the diesel engine cylinder cover, tumble flow required by the gas engine is difficult to generate in the cylinder.

Therefore, how to improve the tumble strength in the cylinder of the gas engine is a technical problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, a first object of the present invention is to provide a cylinder head to generate the tumble motion required by a gas engine by the gas entering the cylinder, so as to improve the thermal efficiency of the gas engine. Another object of the present invention is to provide a gas engine comprising the above cylinder head.

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

the utility model provides a cylinder head, includes cylinder head air inlet, intake duct, throat of admitting air, exhaust throat and intake valve seat circle, the throat of admitting air is kept away from the one side edge of exhaust throat is first edge, the throat of admitting air is close to the one side edge of exhaust throat is the second edge, the intake duct including connect in the first wall of first edge and connect in the second wall of second edge, first wall is equipped with and is located the tumble closed angle of intake valve seat circle top, first wall and/or the second wall is in the upper reaches of tumble closed angle still are provided with the water conservancy diversion portion of throwing in advance that is used for the air of admitting air to flow direction second wall guide.

Preferably, the pre-projecting flow guide part is a pre-flow guide sharp corner arranged on the first wall surface.

Preferably, the pre-flow guide cusp extends in a direction parallel to or inclined toward the bottom surface of the cylinder head, and the tumble cusp extends in a direction parallel to or inclined away from the bottom surface of the cylinder head.

Preferably, the distance between the tail end of the pre-diversion sharp corner and the central line of the inlet valve seat ring is 1.5-3 times of the inner diameter of the inlet valve seat ring.

Preferably, the pre-projecting flow guide part is an arch structure formed by arching the first wall surface or the second wall surface towards the direction away from the bottom surface of the cylinder cover.

Preferably, the first wall surface and the second wall surface are both curved in a direction away from a bottom surface of the cylinder head.

Preferably, the cylinder head inlet is provided to the top surface of the cylinder head, and the intake duct includes an inlet section connected to an upstream of the arching structure, the inlet section extending toward the bottom surface of the cylinder head.

Preferably, the cylinder head air inlet is provided on a side surface of the cylinder head, and an end surface of the cylinder head air inlet is perpendicular to a bottom surface of the cylinder head, or the end surface of the air inlet is obliquely arranged toward the bottom surface of the cylinder head.

Preferably, a section of the air inlet channel close to the air inlet throat is a tumble guide section, the tumble guide section is obliquely arranged relative to the bottom surface of the cylinder cover, meanwhile, a plane passing through the axis of the air inlet throat and the axis of the exhaust throat is a vertical characteristic surface, an intersection line of a part of the second wall surface located in the tumble guide section and the vertical characteristic surface is a wall surface characteristic line, and the wall surface characteristic line is a straight line inclined relative to the bottom surface of the cylinder cover.

Preferably, the maximum distance between the part of the second wall surface, which is positioned in the tumble flow guide section, and the bottom surface of the cylinder head is 0.8-1.5 times the inner diameter of the intake valve seat ring.

Preferably, the included angle between the wall surface characteristic line and the bottom surface of the cylinder cover is 40-80 degrees.

Preferably, a section of the air inlet channel close to the air inlet throat is a tumble guide section, the tumble guide section is obliquely arranged relative to the bottom surface of the cylinder cover, meanwhile, a plane passing through the axis of the air inlet throat and the axis of the exhaust throat is a vertical characteristic surface, an intersection line of a part of the second wall surface located in the tumble guide section and the vertical characteristic surface is a wall surface characteristic line, and the wall surface characteristic line is an arc line protruding towards the bottom surface of the cylinder cover.

Preferably, the projection length of the part, located in the tumble guiding section, of the second wall surface on the bottom surface of the cylinder head is 1-1.5 times of the inner diameter of the intake valve seat ring.

Preferably, the number of the air inlet throats is one or two or three, and each air inlet throat is correspondingly connected with one air inlet channel.

Preferably, the number of the air inlet channels is two or three, and each air inlet channel is arranged in a separated mode.

Preferably, the number of the air inlet channels is two or three, and the pre-cast guide part and/or the tumble closed angle in at least two air inlet channels are different.

Preferably, the head inlet is arranged in a side or top or bottom face of the cylinder head.

A gas engine comprising a cylinder head as claimed in any one of the preceding claims.

In order to achieve the purpose, the invention provides a cylinder head which comprises a cylinder head air inlet, an air inlet channel, an air inlet throat, an exhaust throat and an air inlet valve seat ring, wherein one side edge of the air inlet throat, which is far away from the exhaust throat, is a first edge, one side edge of the air inlet throat, which is close to the exhaust throat, is a second edge, the air inlet channel comprises a first wall surface connected to the first edge and a second wall surface connected to the second edge, the first wall surface is provided with a tumble closed angle positioned above the air inlet valve seat ring, and the first wall surface and/or the second wall surface is/are also provided with a pre-ejection guide part used for guiding the intake air to flow to the second wall surface at the upstream of the tumble closed angle.

The working principle of the invention is as follows:

when the gas engine cylinder breathes in, the (air) intake valve is opened, the air current that admits air flows through the intake duct in proper order, get into the cylinder behind intake valve and the intake valve seat circle, at the in-process that flows through the intake duct, receive the effect of the guide part of throwing in advance and the tumble closed angle that set up in the intake duct, the second wall of air current pressure close to the intake duct that admits air reduces the air current that admits air of first wall one side, this kind of air current distribution mode makes the air current form the big scale tumble motion after getting into the cylinder more easily to form effectual tumble in the cylinder.

Therefore, on the basis of the existing diesel engine, the pre-cast flow guide part and the tumble sharp corner are arranged in the air inlet channel, so that the distribution of intake air flow in the air inlet channel can be realized, the effective flow guide of the intake air flow is realized, most of the intake air flow is close to the second wall surface, the tumble strength is favorably enhanced, the turbulent flow is formed at the last stage of compression, and the heat efficiency of the gas engine is improved.

The invention also provides a gas engine, which comprises the cylinder cover, and the cylinder cover has the technical effects, so that the gas engine using the cylinder cover also has the technical effects, and the details are not repeated.

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 cross-sectional view of a cylinder head provided in accordance with one embodiment of the present invention;

FIG. 2 is a cross-sectional view of a cylinder head provided in accordance with another embodiment of the present invention;

fig. 3 is a sectional view of a cylinder head according to still another embodiment of the present invention.

In fig. 1-3:

1 is a cylinder cover; 2 is a cylinder; 3 is an air inlet channel; 4 is an inlet valve seat ring; 5 is a first wall surface; 6 is a second wall surface; 7 is a tumble sharp angle; 8 is a pre-diversion sharp corner; 9 is a tumble guiding section; 10 is a wall surface characteristic line; and 11 is the bottom surface of the cylinder head.

Detailed Description

One of the cores of the invention is to provide a cylinder cover, the structural design of which can enable the gas entering the cylinder to generate the tumble motion required by the gas engine, thereby improving the thermal efficiency of the gas engine.

The other core of the invention is to provide a gas engine based on the cylinder cover.

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 and 2, fig. 1 is a sectional view of a cylinder head according to an embodiment of the present invention, and fig. 2 is a sectional view of a cylinder head according to another embodiment of the present invention.

The embodiment of the invention provides a cylinder cover 1 which comprises a cylinder cover air inlet, an air inlet channel 3, an air inlet throat, an exhaust throat and an air inlet valve seat ring 4.

Wherein, the cylinder cap air inlet links to each other with intake duct 3, the throat that admits air is kept away from the one side edge of exhaust throat is first edge, the throat that admits air is close to the one side edge of exhaust throat is the second edge, intake duct 3 is including connecting in the first wall 5 of first edge and connecting in the second wall 6 of second edge, first wall 5 is equipped with the tumble closed angle 7 that is located intake valve seat circle 4 top, first wall 5 and/or second wall 6 still are provided with in the upper reaches of tumble closed angle 7 and are used for the guiding of the air inflow to the second wall 6 of throwing in advance.

The cylinder head 1 provided by the invention can be suitable for a two-valve engine or a multi-valve engine, namely, the number of the inlet throats can be one or two or three or more, and the number of the exhaust throats can also be one or two or more, which is not described in detail herein.

The working principle of the invention is as follows:

when gas engine cylinder 2 breathes in, the (air) intake valve is opened, the air current that admits air flows through intake duct 3 in proper order, get into cylinder 2 behind intake valve and the intake valve seat circle 4, flow through intake duct 3 in-process, receive the effect of the water conservancy diversion portion of throwing in advance and tumble closed angle 7 that sets up in the intake duct 3, the second wall 6 of intake duct 3 is pressed close to the air current that admits air, reduce the air current that admits air of 5 one sides of first wall, this kind of air current distribution mode makes the air current form the large-scale tumble motion more easily after getting into cylinder 2, thereby form effectual tumble in cylinder 2.

Therefore, on the basis of the existing diesel engine, the pre-cast guide part and the tumble sharp corner 7 are arranged in the air inlet 3, so that the distribution of the intake air flow in the air inlet 3 can be realized, the effective guide of the intake air flow is realized, most of the intake air flow is close to the second wall surface 6, the tumble strength is favorably enhanced, the turbulent flow is formed at the final stage of compression, and the heat efficiency of the gas engine is improved.

The pre-projecting flow guide can be implemented in various ways, and in one embodiment of the invention, as shown in fig. 1, the pre-projecting flow guide can be a pre-flow guide sharp corner 8 arranged on the first wall surface 5, and the pre-flow guide sharp corner 8 basically has the same function as the tumble flow sharp corner 7 and guides the intake airflow to the direction of the second wall surface 6.

The protruding lengths and extending directions of the pre-diversion sharp corner 8 and the tumble sharp corner 7 can be the same or different, as shown in fig. 1, in an embodiment of the present invention, the pre-diversion sharp corner 8 extends in a direction parallel to the bottom surface 11 of the cylinder head 1 or obliquely in a direction toward the bottom surface 11 of the cylinder head 1, and the tumble sharp corner 7 extends in a direction parallel to the bottom surface 11 of the cylinder head 1 or obliquely in a direction away from the bottom surface 11 of the cylinder head 1, so that the pre-diversion sharp corner 8 can avoid causing large resistance between intake airflows entering a down-stroke stage, ensure the smoothness of the intake airflows, and the tumble sharp corner 7 can make the intake airflows closer to the second wall surface 6.

Preferably, the distance L between the end of the pre-diversion sharp corner 8 and the central line of the inlet valve seat ring 4₁Is 1.5 to 3 times of the inner diameter D of the inlet valve seat ring 4, specifically, the distance L between the tail end of the pre-diversion sharp corner 8 and the central line of the inlet valve seat ring 4₁Is 1.5 times or 2 times or 2.5 times or 3 times the inner diameter D of the intake valve seat ring 4.

In another embodiment of the present invention, as shown in fig. 2, the pre-projecting flow guiding portion is an arch structure formed by the first wall surface 5 or the second wall surface 6 being arched away from the bottom surface 11 of the cylinder head 1, and the arch structure can also make most of the intake airflow close to the second wall surface 6, so as to guide the intake airflow.

As shown in fig. 2, in this embodiment, the first wall surface 5 and the second wall surface 6 are both curved in a direction away from the bottom surface 11 of the cylinder head 1. Height L of cylinder head air inlet₃And the arching height L of the arching structure₄Satisfy L₃：L₄= 1: 1-1: 3, height L of cylinder head air inlet₃The distance between the geometric center of the cylinder head air inlet and the bottom surface 11 of the cylinder head 1 and the arching height L of the arching structure₄The distance from the highest point of the first wall surface 5 in the arching structure to the bottom surface 11 of the cylinder head 1.

It is easily understood by those skilled in the art that the cylinder head inlet may be disposed on the top surface, the side surface or the bottom surface of the cylinder head 1, so as to facilitate installation and arrangement of engines of different models, and the structure of the air inlet 3 in the embodiment shown in fig. 2 also needs to be adapted according to the arrangement position of the cylinder head inlet, for example, if the cylinder head inlet is disposed on the top surface of the cylinder head 1, the air inlet 3 should further include an inlet section connected to the upstream of the arching structure, and the inlet section extends toward the bottom surface 11 of the cylinder head 1, so that the inlet section, the arching structure and the following tumble guiding section 9 form an S-shaped air passage structure.

When the head intake port is provided in the side of the cylinder head 1, the end surface of the head intake port is perpendicular to the bottom surface 11 of the cylinder head 1, or the end surface of the intake port is arranged obliquely toward the bottom surface 11 of the cylinder head 1, as shown in fig. 2.

Preferably, a section of the intake passage 3 near the intake throat is a tumble guiding section 9, the tumble guiding section 9 is arranged obliquely with respect to the bottom surface 11 of the cylinder head 1, meanwhile, the plane passing through the axis of the air inlet throat and the axis of the air outlet throat is a vertical characteristic surface, the intersecting line of the part of the second wall surface 6 in the tumble guiding section 9 and the vertical characteristic surface is a wall surface characteristic line 10, as shown in figure 3, in one embodiment, the wall surface characteristic line 10 is a straight line inclined with respect to the bottom surface 11 of the cylinder head 1, namely, in the air inlet direction, the tumble guiding section 9 extends along the direction of straight line descending downwards, so that the airflow thrown out by the pre-throwing guide part and the tumble sharp corner 7 further flows along the direction of straight line descending downwards, the inlet airflow rapidly descends before entering the air inlet throat, therefore, the scheme can further improve the tumble strength while reducing the energy loss of the gas flow.

Further optimizing the technical scheme, the maximum distance L between the part of the second wall surface 6 in the tumble flow guide section 9 and the bottom surface 11 of the cylinder cover 1₅Is 0.8 to 1.5 times of the inner diameter of the inlet valve seat ring 4.

More preferably, the included angle between the wall surface characteristic line 10 and the bottom surface 11 of the cylinder head 1 is 40 to 80 °.

As shown in fig. 1, in another embodiment, a section of the intake passage 3 close to the intake throat is a tumble guiding section 9, the tumble guiding section 9 is arranged obliquely with respect to a bottom surface 11 of the cylinder head 1, while a plane passing through an axis of the intake throat and an axis of the exhaust throat is a vertical characteristic plane, an intersection line of a portion of the second wall surface 6 located in the tumble guiding section 9 and the vertical characteristic plane is a wall surface characteristic line 10, and the wall surface characteristic line 10 is an arc line protruding toward the bottom surface 11 of the cylinder head 1, that is, the entire tumble guiding section 9 is bent convexly toward the bottom surface 11 of the cylinder head 1. So set up, the first half section of tumble direction section 9 just can be with admit air current guide to contralateral tumble closed angle 7, and the air current that is thrown out by tumble closed angle 7 falls fast to the throat of admitting air along the second half section of tumble direction section 9 again to aggravate the trend that the air current of admitting air moved to exhaust throat direction.

Preferably, the projection length L of the part of the second wall surface 6 located in the tumble flow guide section 9 on the bottom surface 11 of the cylinder head 1₂Is 1 to 1.5 times of the inner diameter D of the inlet valve seat ring 4, specifically, the projection length L of the part of the second wall surface 6 positioned in the tumble flow guide section 9 on the bottom surface 11 of the cylinder head 1₂Is 1 time or 1.2 times or 1.5 times the inner diameter D of the intake valve seat ring 4.

Further optimize above-mentioned technical scheme, the quantity of throat that admits air is one or two or three, and every throat that admits air all corresponds and is connected with an intake duct 3, if the quantity of intake duct 3 is a plurality of, then each intake duct 3 can separate each other and arrange, also can connect as an organic wholely in the one end of keeping away from the throat that admits air.

Preferably, the number of the air inlet channels 3 is multiple, and the pre-cast flow guide part and/or the tumble angle 7 in at least two air inlet channels 3 are different.

Based on the cylinder head 1, the embodiment of the present invention further provides a gas engine, which includes the cylinder head 1 according to the above embodiment, and as the gas engine adopts the cylinder head 1 according to the above embodiment, please refer to the above embodiment for technical effects of the gas engine.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

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.