1. An operating mode switching apparatus, comprising: a neutralizer and a pressure selection valve (2);

the centering device comprises: a modal conversion valve (1) and an actuating component;

the modal converter valve (1) comprises: a valve sleeve (101), a valve core (102) and an elastic body (103);

the pressure selection valve (2) is provided with an output interface (213) for outputting pressure larger than a preset threshold value or pressure not larger than the preset threshold value;

the actuating assembly includes: a wall hole type centering actuating cylinder (104), two first one-way valves (105) and a piston rod (106);

valve barrel (101) are both ends confined hollow structure, be equipped with two pairs on hollow structure's the lateral wall and be used for the intercommunication the work interface of main work pipeline, wherein, each pair of work interface includes: a first interface (107) and a second interface (108);

the valve core (102) is of a rod-shaped structure, and two shaft shoulders are respectively arranged on the rod-shaped structure;

a shaft shoulder is arranged on the piston rod (106);

two third interfaces (109) and a loop-in pipeline interface (110) for connecting the box body (3) are arranged on a cylinder arm of the wall hole type loop-in actuating cylinder (104), and the loop-in pipeline interface (110) is positioned between the two third interfaces (109);

the piston rod (106) is arranged in the cavity of the wall hole type centering actuating cylinder (104);

the valve core (102) is arranged in the cavity of the valve sleeve (101), the first end of the valve core (102) is fixedly provided with an elastic body (103), and the second end of the valve core penetrates through the closed end of the valve sleeve (101) and is connected with the output interface (213);

each third interface (109) corresponds to one second interface (108) and one first one-way valve (105), each third interface (109) is respectively connected with the liquid outlet of one second interface (108) and the liquid outlet of one first one-way valve (105), and the liquid inlet of each first one-way valve (105) is connected with the box body (3);

when the output interface (213) outputs a pressure greater than a preset threshold value, the shoulder of the piston rod (106) can move along the wall hole type centering actuator cylinder (104) under the action of the pressure output by the main working pipeline of the first interface (107);

when the output interface (213) outputs a pressure not greater than a preset threshold value, the shaft shoulder of one valve core (102) corresponds to one first interface (107), the shaft shoulder of each valve core (102) is triggered to correspondingly seal one first interface (107), and if the external load direction borne by the piston rod (106) points to the loop pipeline interface (110) along the axial direction of the piston rod (106), the shaft shoulder of the piston rod (106) is triggered to seal the loop pipeline interface (110).

2. The device according to claim 1, characterized in that the elastic body (103) is a spring.

3. The apparatus of claim 2, wherein the end sidewall is provided with a pair of loop interfaces, the pair of loop interfaces comprising: a fourth interface (111) and a fifth interface (112); the end side wall is a side wall between the closed end of the hollow structure and a shaft shoulder adjacent to the valve core (102);

the loop-in pipeline interface (110) is connected with the fourth interface (111), and the fifth interface is used for connecting the box body (3).

4. A device according to any one of claims 1 to 3, characterized in that the pressure selection valve (2) comprises: an electromagnetic valve (21);

the electromagnetic valve (21) is provided with a sixth interface (211), a seventh interface (212) and an eighth interface which are used as an output interface (213) and a circuit interface (214);

the sixth interface (211) is used for connecting a box body (3) for providing working media;

the seventh interface (212) is used for connecting a hydraulic source (4);

the circuit interface (214) is used for connecting a power supply, when the circuit interface (214) is powered on, the connection between the sixth interface (211) and the output interface (213) is triggered to be blocked, and the connection between the seventh interface (212) and the output interface (213) is triggered;

when the circuit interface (214) is not powered on, the connection between the seventh interface (212) and the output interface (213) is blocked, and the connection between the sixth interface (211) and the output interface (213) is triggered.

5. The device according to claim 4, characterized in that said pressure selection valve (2) further comprises: a second check valve (22);

the liquid inlet of the second one-way valve (22) is connected with the hydraulic source (4);

the liquid outlet of the second one-way valve (22) is connected with the seventh interface (212).

6. A device according to claim 5, wherein the number of said second one-way valves (22) is greater than one, and the inlet of each said second one-way valve (22) is adapted to be connected to one said hydraulic pressure source (4).

7. A device according to claim 5, wherein the number of said second non-return valves (22) is one.

8. A repeater, the repeater comprising: a modal conversion valve (1) and an actuating component;

the modal converter valve (1) comprises: the valve core (101), the valve sleeve (102) and the elastic body (103);

the actuating assembly includes: a wall hole type centering actuating cylinder (104), two first one-way valves (105) and a piston rod (106);

valve barrel (101) are both ends confined hollow structure, be equipped with two pairs on hollow structure's the lateral wall and be used for the intercommunication the work interface of main work pipeline, wherein, each pair of work interface includes: a first interface (107) and a second interface (108);

the valve core (102) is of a rod-shaped structure, and two shaft shoulders are respectively arranged on the rod-shaped structure;

the piston rod (106) is provided with a shaft shoulder;

two third interfaces (109) and a loop-in pipeline interface (110) for connecting the box body (3) are arranged on a cylinder arm of the wall hole type loop-in actuating cylinder (104), and the loop-in pipeline interface (110) is positioned between the two third interfaces (109);

the piston rod (106) is arranged in the cavity of the wall hole type centering actuating cylinder (104);

the valve core (102) is arranged in the cavity of the valve sleeve (101), the first end of the valve core (102) is fixedly provided with an elastic body (103), and the second end of the valve core penetrates through the closed end of the valve sleeve (101);

each third interface (109) corresponds to one second interface (108) and one first one-way valve (105), each third interface (109) is respectively connected with the liquid outlet of one second interface (108) and the liquid outlet of one first one-way valve (105), and the liquid inlet of each first one-way valve (105) is connected with the box body (3);

when the pressure of the second end is greater than a preset threshold value, the shaft shoulder of the piston rod (106) can move along the wall hole type centering cylinder (104) under the action of the pressure output by the main working pipeline of the first interface (107);

when the pressure which is not greater than the preset threshold value is input at the second end, the shaft shoulder of one valve core (102) corresponds to one first interface (107), the shaft shoulder of each valve core (102) is triggered to correspondingly seal one first interface (107), and if the external load direction borne by the piston rod (106) points to the loop pipeline interface (110) along the axial direction of the piston rod (106), the shaft shoulder of the piston rod (106) is triggered to seal the loop pipeline interface (110).

9. A centering device according to claim 8, characterized in that said elastic body (103) is a spring.

10. The repeater as recited in claim 9, wherein a pair of loop ports are provided on the end side wall, the pair of loop ports comprising: a fourth interface (111) and a fifth interface (112); the end side wall is a side wall between the closed end of the hollow structure and a shaft shoulder adjacent to the valve core (102);

the loop-in pipeline interface (110) is connected with the fourth interface (111), and the fifth interface is used for connecting the box body (3).

Background

The hydraulic transmission is a transmission form that fluid is used as a working medium to transmit and control energy, and compared with electric transmission and mechanical transmission, the hydraulic transmission has the advantages of large output force, compact structure, small volume, convenient speed regulation, easy control and the like, so the hydraulic transmission is widely applied to airplanes.

The airplane hydraulic transmission refers to a transmission form that oil is used as a working medium on an airplane and an execution load mechanism is driven by oil pressure to complete a specific operation action; the working principle of airplane hydraulic transmission is as follows: in the flying process of the airplane, the hydraulic source can provide power for the main working pipeline in real time, and the main working pipeline drives the execution load mechanism of the control surface to rotate so that the airplane can fly normally. Based on the working principle of the hydraulic transmission of the airplane, a situation that the hydraulic source fails may exist, and if one hydraulic source fails, the control surface supported by the failed hydraulic source cannot return to the neutral position, so that a device which can return the control surface to the neutral position by switching the working mode of a main working pipeline of the hydraulic transmission under the condition of no hydraulic power is provided, so that a pilot can switch other control surfaces in real time to keep the normal flight of the airplane.

Disclosure of Invention

An object of an embodiment of the present invention is to provide an operation mode switching device and a centering device, which can solve the problem that a control surface can return to a neutral position without hydraulic power. The specific technical scheme is as follows:

an operating mode switching apparatus, the apparatus comprising: a neutralizer and a pressure selection valve;

the centering device comprises: a modal converter valve and an actuating assembly;

the modal converter valve comprises: a valve sleeve, a valve core and an elastic body;

the pressure selection valve is provided with an output interface for outputting pressure greater than a preset threshold value or pressure not greater than the preset threshold value;

the actuating assembly includes: the wall hole type centering actuator cylinder, the two first one-way valves and the piston rod;

the valve barrel is the hollow structure that both ends are confined, be equipped with two pairs on hollow structure's the lateral wall and be used for the intercommunication the work interface of main work pipeline, wherein, every pair of work interface includes: a first interface and a second interface;

the valve core is of a rod-shaped structure, and two shaft shoulders are respectively arranged on the rod-shaped structure;

a shaft shoulder is arranged on the piston rod;

two third interfaces and a return pipeline interface for connecting the box body are arranged on a cylinder arm of the wall hole type return actuator cylinder, and the return pipeline interface is positioned between the two third interfaces;

the piston rod is arranged in the cavity of the wall hole type centering actuating cylinder;

the valve core is arranged in the cavity of the valve sleeve, the first end of the valve core is fixedly provided with an elastic body, and the second end of the valve core penetrates through the closed end of the valve sleeve and is connected with the output interface;

each third interface corresponds to one second interface and one first one-way valve, each third interface is respectively connected with one second interface and the liquid outlet of one first one-way valve, and the liquid inlet of each first one-way valve is connected with the box body;

when the output interface outputs pressure greater than a preset threshold value, the shaft shoulder of the piston rod can move along the wall hole type centering actuating cylinder under the action of the pressure output by the main working pipeline of the first interface;

when the output interface outputs pressure not greater than a preset threshold value, the shaft shoulder of one valve core corresponds to one first interface, the shaft shoulder of each valve core is triggered to correspondingly seal one first interface, and if the external load direction borne by the piston rod points to the loop-in-loop pipeline interface along the axial direction of the piston rod, the shaft shoulder of the piston rod is triggered to seal the loop-in-loop pipeline interface.

Further, the elastic body is a spring.

Further, be equipped with a pair of return circuit interface on the terminal lateral wall, a pair of return circuit interface includes: a fourth interface and a fifth interface; the end side wall is a side wall between the closed end of the hollow structure and a shaft shoulder adjacent to the valve core;

the loop-in pipeline interface is connected with the fourth interface, and the fifth interface is used for connecting the box body.

Further, the pressure selection valve includes: an electromagnetic valve;

the electromagnetic valve is provided with a sixth interface, a seventh interface and an eighth interface which are used as output interfaces and circuit interfaces;

the sixth interface is used for connecting a box body for providing working media;

the seventh interface is used for connecting a hydraulic source;

the circuit interface is used for being connected with a power supply, when the circuit interface is connected with the power supply, the connection between the sixth interface and the output interface is triggered to be blocked, and the connection between the seventh interface and the output interface is triggered;

when the circuit interface is not powered on, the connection between the seventh interface and the output interface is triggered to be blocked, and the connection between the sixth interface and the output interface is triggered to be connected.

Further, the pressure selection valve further includes: a second one-way valve;

the liquid inlet of the second one-way valve is used for being connected with the hydraulic source;

and a liquid outlet of the second one-way valve is connected with the seventh interface.

Furthermore, the number of the second one-way valves is more than one, and a liquid inlet of each second one-way valve is used for being connected with one hydraulic source.

Further, the number of the second check valves is one.

A centering device, comprising: a modal converter valve and an actuating assembly;

the modal converter valve comprises: a valve core, a valve sleeve and an elastic body;

the actuating assembly includes: the wall hole type centering actuator cylinder, the two first one-way valves and the piston rod;

the valve barrel is the hollow structure that both ends are confined, be equipped with two pairs on hollow structure's the lateral wall and be used for the intercommunication the work interface of main work pipeline, wherein, every pair of work interface includes: a first interface and a second interface;

the valve core is of a rod-shaped structure, and two shaft shoulders are respectively arranged on the rod-shaped structure;

the piston rod is provided with a shaft shoulder;

two third interfaces and a return pipeline interface for connecting the box body are arranged on a cylinder arm of the wall hole type return actuator cylinder, and the return pipeline interface is positioned between the two third interfaces;

the piston rod is arranged in the cavity of the wall hole type centering actuating cylinder;

the valve core is arranged in the cavity of the valve sleeve, the first end of the valve core is fixedly provided with an elastic body, and the second end of the valve core penetrates through the closed end of the valve sleeve;

each third interface corresponds to one second interface and one first one-way valve, each third interface is respectively connected with one second interface and the liquid outlet of one first one-way valve, and the liquid inlet of each first one-way valve is connected with the box body;

when the pressure which is greater than the preset threshold value is input from the second end, the shaft shoulder of the piston rod can move along the wall hole type centering actuating cylinder under the action of the pressure output by the main working pipeline of the first connector.

When the pressure which is not greater than the preset threshold value is input at the second end, the shaft shoulder of one valve core corresponds to one first interface, the shaft shoulder of each valve core is triggered to correspondingly seal one first interface, and if the external load direction borne by the piston rod points to the loop-in-loop pipeline interface along the axial direction of the piston rod, the shaft shoulder of the piston rod is triggered to seal the loop-in-loop pipeline interface.

Further, the elastic body is a spring.

Further, be equipped with a pair of return circuit interface on the terminal lateral wall, a pair of return circuit interface includes: a fourth interface and a fifth interface; the end side wall is a side wall between the closed end of the hollow structure and a shaft shoulder adjacent to the valve core;

the loop-in pipeline interface is connected with the fourth interface, and the fifth interface is used for connecting the box body.

The embodiment of the invention provides a working mode conversion device and a mode selection valve; the device includes: a neutralizer and a pressure selection valve; when the output interface of the pressure selection valve outputs pressure larger than a preset threshold value, the shaft shoulder of the piston rod can move along the wall hole type centering actuating cylinder under the action of the pressure output by the main working pipeline of the first interface; when the output interface of the pressure selection valve outputs pressure which is not larger than a preset threshold value, a shaft shoulder of one valve core corresponds to one first interface, and if the external load direction borne by the piston rod points to the loop pipeline interface along the axial direction of the piston rod, the shaft shoulder of the piston rod is triggered to seal the loop pipeline interface; by applying the scheme provided by the embodiment of the invention, the control surface can return to the neutral position, so that a pilot can conveniently control the airplane through other control surfaces and keep the airplane flying normally. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.

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.

Fig. 1 is a schematic structural diagram of a first operating mode switching device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a first pressure selection valve according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second operation mode conversion device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a second pressure selection valve provided in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a third pressure selection valve provided in accordance with an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a mode selection valve according to an embodiment of the present invention.

1-modal switching valve; 2-a pressure selection valve; 3, a box body; 4-a hydraulic source; 21-an electromagnetic valve; 22-a second one-way valve; 211-sixth interface; 212-a seventh interface; 213-an output interface; 214-a circuit interface; 101-a valve housing; 102-a valve core; 103-an elastomer; 104-a bore-type centering ram; 105-a first one-way valve; 106-a piston rod; 107-a first interface; 108-a second interface; 109-a third interface; 110-loop pipe interface; 111-a fourth interface; 112-fifth interface; 113-load mechanism.

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, fig. 1 is a schematic structural diagram of a first operation mode switching device provided in an embodiment of the present invention, the device including a neutralizer and a pressure selection valve;

the centering device comprises: a modal conversion valve 1 and an actuating assembly;

the mode switching valve 1 includes: a valve sleeve 101, a valve core 102, an elastic body 103, a wall hole type centering actuating cylinder 104, two first one-way valves 105 and a piston rod 106;

the pressure converter 2 is provided with an output interface 213 for outputting a pressure greater than a preset threshold value or a pressure not greater than the preset threshold value;

valve barrel 101 is the closed hollow structure in both ends, be equipped with two pairs on hollow structure's the lateral wall and be used for the intercommunication the work interface of main work pipeline, wherein, each pair of work interface includes: a first interface 107 and a second interface 108;

the valve core 102 is a rod-shaped structure, and two shaft shoulders are respectively arranged on the rod-shaped structure;

the piston rod 106 is provided with a shaft shoulder;

two third interfaces 109 and a centering pipeline interface 110 for connecting the box body 3 are arranged on the cylinder arm of the wall hole type centering actuating cylinder 104, and the centering pipeline interface 110 is positioned between the two third interfaces 109;

the piston rod 106 is arranged in the cavity of the wall hole type centering actuating cylinder 104;

the valve core 102 is disposed in the cavity of the valve housing 101, a first end of the valve core 102 is fixedly installed with an elastic body 103, and a second end penetrates through the closed end of the valve housing 101 and is connected with the output interface 213;

each third port 109 corresponds to one second port 108 and one first one-way valve 105, each third port 109 is respectively connected with a liquid outlet of one second port 108 and a liquid outlet of one first one-way valve 105, and a liquid inlet of each first one-way valve 105 is connected with the box body 3;

when the output port 213 outputs a pressure greater than a preset threshold, the shoulder of the piston rod 106 can move along the bore-type centering ram 104 under the pressure output by the main working line of the first port 107;

when the output interface 213 outputs a pressure not greater than a preset threshold, a shoulder of one valve element 102 corresponds to one first interface 107, and if the direction of the external load applied to the piston rod 106 is directed to the loop-in-loop pipeline interface 110 along the axial direction of the piston rod 106, the shoulder of the piston rod 106 is triggered to seal the loop-in-loop pipeline interface 110.

The working medium may be oil, soapy water, or water, which is not limited in the embodiments of the present invention. If the working medium is oil, the tank 3 supplying the oil may serve as an oil tank, and if the working medium is water, the tank 3 supplying the water may serve as a water tank.

It should be noted that, because the field related to the embodiment of the present invention is the field of hydraulic technology, the connection between the interfaces or the connection between the interfaces and the tank related to the embodiment of the present invention may be understood as being connected by a pipeline, and may also be understood as: when the interface is in a tubular structure, the connection between the interfaces or the connection between the interfaces and the box body is directly communicated. For example: the second end penetrates through the closed end of the valve housing 101 and is connected with the output interface 213, and if the output interface 213 is in a tubular structure, the output interface 213 can be directly communicated with the box body 3 without using a pipeline; similarly, the liquid inlet of the first one-way valve 105 is connected to the liquid outlet of the tank 3, and each of the third ports 109 is connected to one of the second ports 108 and one of the liquid outlets of the first one-way valve 105 through a pipeline, or through a butt joint between the ports.

The predetermined threshold may be 2.5MPa, and a pressure greater than 2.5MPa is used as the high pressure, and a pressure not greater than 2.5MPa is used as the low pressure.

In order to properly arrange the first interface 107 and the second interface 108, a pair of working interfaces, namely the first interface 107 and the second interface 108, may be oppositely arranged on the side wall of the valve housing 101, the first interface 107 and the second interface 108 may also be oppositely arranged on the side wall of the valve housing 101, or the first interface 107 and the second interface 108 may also be arranged on the side wall of the valve housing 101 in a staggered and opposite manner.

It should be noted that the load end of the piston rod 106 is used to connect the load mechanism 113 that controls the movement of the control surface.

The working principle of the device provided by the embodiment of the invention is as follows: the pressure selection valve 2 is connected to the second end of the valve core 102 of the mode switching valve 1, when the input pressure at the second end is high pressure, the high pressure is compared with the elastic force of the elastic body 103, when the high pressure overcomes the elastic force, the elastic body 103 is in a compression state, the first interface of each pair of working interfaces is communicated with the main working pipeline, the oil pressure flowing through the second interface 108 triggers the piston rod 106 to move along the wall hole type centering actuating cylinder, namely the shaft shoulder of the piston rod 106 can move along the wall hole type centering actuating cylinder under the action of the pressure output by the main working pipeline of the first interface, and at the moment, the control surface supported by the hydraulic source 4 belongs to a normal working state; when the input pressure at the second end of the valve core 102 is low pressure, the elastic force of the spring is high pressure at this time, the low pressure is smaller than the elastic force, the elastic body recovers the compression state, the elastic force is released, the elastic force released by the elastic body triggers the valve core 102 to block the communication of each pair of working interfaces, so that the working interfaces are not communicated with the main working pipeline, as shown in fig. 1, when the control surface has external load and the return direction is the same as the return direction, the external load pushes the piston rod to move from the first cavity to the second cavity, the oil in the first cavity is supplemented by the oil tank through the first check valve and the third interface, the oil in the second cavity returns to the oil tank through the return pipeline interface 110, the fourth interface 111 and the fifth interface 112 until the shaft shoulder of the piston rod 106 seals the return pipeline interface 110; at this point the piston rod connected load mechanism 113 causes the control surface to be in a neutral position.

It can be seen that the apparatus provided by the embodiments of the present invention includes a neutralizer and a pressure selection valve; the centering device comprises: a modal conversion valve 1 and an actuating assembly; the centering device is provided with a wall hole type centering actuating cylinder, two pairs of working interfaces communicated with a main working pipeline are arranged on a valve sleeve of the modal conversion valve 1, when the input pressure of a second end is high pressure, each pair of working interfaces is triggered to be communicated with the main working pipeline, a piston rod 208 of the actuating assembly is triggered to move along the wall hole type centering actuating cylinder 104 of the actuating assembly, and the control surface is enabled to be in a normal working state; when the input pressure at the second end is low pressure, a shoulder of one valve core 102 corresponds to one first interface 107, and if the direction of the external load applied to the piston rod 106 is directed to the loop-in-loop pipeline interface 110 along the axial direction of the piston rod 106, the shoulder of the piston rod 106 is triggered to seal the loop-in-loop pipeline interface 110, so that the control surface can return to a neutral position, a pilot can control the airplane through other control surfaces conveniently, and the normal flight of the airplane is maintained.

In one implementation, the elastomer may be a spring, which is simple and low cost.

In order to reduce the arrangement of the pipeline, as shown in fig. 1, one implementation is as follows: be equipped with a pair of return circuit interface on the end lateral wall, a pair of return circuit interface includes: a fourth interface 111 and a fifth interface 112; the end side wall is a side wall between the closed end of the hollow structure and a shoulder adjacent to the valve core 102;

the middle return pipeline interface 110 is connected to the fourth interface 111, and the fifth interface is used for connecting the box body 3.

Therefore, the realization mode not only realizes the communication between the loop pipeline interface 110 and the box body 3, but also saves the pipeline and reasonably realizes the layout of the pipeline.

In order to control the working state of the main working pipeline, one implementation manner of the pressure selection valve 2 is shown in fig. 2, and a specific implementation manner is as follows:

the pressure selection valve 2 includes: an electromagnetic valve 21;

the electromagnetic valve 21 is provided with a sixth interface 211, a seventh interface 212 and an eighth interface which are used as an output interface 213 and a circuit interface 214;

the sixth interface 211 is used for connecting the box 3 for providing the working medium;

the seventh interface 212 is used for connecting the hydraulic source 4;

the circuit interface 214 is used for connecting a power supply, and when the circuit interface 214 is powered on, the connection between the sixth interface 211 and the output interface 213 is triggered to be blocked, and the connection between the seventh interface 212 and the output interface 213 is triggered;

when the circuit interface 214 is not powered on, the connection between the seventh interface 212 and the output interface 213 is triggered to be blocked, and the connection between the sixth interface 211 and the output interface 213 is triggered.

It can be seen that, when the circuit interface 214 is powered on, the pressure selection valve 2 of the present implementation can trigger to block the communication between the sixth interface 211 and the output interface 213, and trigger the communication between the seventh interface 212 and the output interface 213; when the circuit interface 214 is not powered on, the connection between the seventh interface 212 and the output interface 213 is triggered to be blocked, the connection between the sixth interface 211 and the output interface 213 is triggered to be connected, and the control of the working state of the control surface supported by the hydraulic source is realized.

Based on the working principle of the aircraft hydraulic transmission, the situation that the high pressure supplied by the hydraulic source disappears due to pressure fluctuation may exist, but under the situation that the high pressure disappears, the hydraulic source cannot provide power for the mode switching valve 1, so that the main working oil path connected with the mode switching valve cannot keep continuous normal work.

When the pressure fluctuation occurs in the hydraulic source, the pressure fluctuation makes the hydraulic pressure provided by the hydraulic source smaller than the elastic force of the elastic body in the mode switching valve, that is, the hydraulic pressure cannot continuously provide continuous power for the mode switching valve, so that the mode switching valve can cut off the communication between the working interface and the main working oil path under the condition that the electromagnetic valve is electrified, so that the main working oil path cannot continuously and normally work, and in order to keep the normal flight of the airplane, the embodiment of the invention provides the pressure selection valve 2 which can provide continuous and stable power for the mode switching valve under the condition of no hydraulic power, as shown in fig. 3 to 4, the specific implementation manner is as follows:

the pressure selection valve 2 includes: solenoid valve 21 and second check valve 22

The electromagnetic valve 21 is provided with a sixth interface 211, a seventh interface 212 and an eighth interface which are used as an output interface 213 and a circuit interface 214;

the sixth interface 211 is used for connecting the box 3 for providing the working medium;

the liquid inlet of the second one-way valve 22 is used for connecting the hydraulic source 4;

the liquid outlet of the second check valve 22 is connected with the seventh interface 212;

the circuit interface 214 is used for connecting a power supply, and when the circuit interface 214 is powered on, the connection between the sixth interface 211 and the output interface 213 is triggered to be blocked, and the connection between the seventh interface 212 and the output interface 213 is triggered;

when the circuit interface 214 is not powered on, the connection between the seventh interface 212 and the output interface 213 is triggered to be blocked, and the connection between the sixth interface 211 and the output interface 213 is triggered.

The working principle of the pressure selection valve 2 is as follows: the hydraulic source continuously provides power through oil, namely high pressure is generated through the oil in the pipeline, the high-pressure oil sequentially passes through the second one-way valve 22 to reach the seventh interface 212 of the electromagnetic valve 21, when the circuit interface 214 of the electromagnetic valve 21 is powered on, the communication between the sixth interface 211 and the output interface 213 is triggered and blocked in the cavity of the electromagnetic valve 21, and the communication between the seventh interface 212 and the output interface 213 is triggered; the hydraulic source generates high oil pressure to enter from the seventh interface 212, to be output from the output interface 213, and to enter the input interface of the mode switching valve 1, so that the working interface of the mode switching valve 1 is communicated with the main working pipeline, and further the control surface supported by the hydraulic source is in a normal working state;

when the circuit interface 214 of the electromagnetic valve 21 is not powered on, the communication between the seventh interface 212 and the output interface 213 is triggered to be blocked, the communication between the sixth interface 211 and the output interface 213 is triggered, so that the seventh interface 212 and the second check valve 22 are in a non-communication state, and the sixth interface 211 and the output interface 213 are in a communication state; therefore, if the oil output from the output port 213 belongs to low-pressure oil, the oil pressure input to the input port of the mode switching valve 1 is also low-pressure oil, and the main working line connected to the working port of the mode switching valve 1 is triggered to be blocked.

Therefore, according to the device provided by the embodiment of the invention, when the circuit interface 214 is powered on, the seventh interface 212 and the output interface 213 are triggered to be communicated, high-pressure oil provided by the hydraulic source is output to the second end of the mode conversion valve 1 through the second one-way valve 22 through the output interface 213, and a main working pipeline connected with the working interface is triggered to be communicated, so that continuous and stable power can be still provided for the mode conversion valve when the hydraulic source fluctuates, and further, the normal work of a control surface supported by the hydraulic source 4 is realized, and the airplane can fly normally.

The connection between the second check valve 22 and the hydraulic source 4 may be in various manners, wherein when one second check valve 22 is used, in order to ensure the normal operation of the hydraulic source 4, that is, the hydraulic source 4 can provide continuous pressure, a plurality of hydraulic sources 4 may be used, and a liquid inlet of one second check valve 22 is connected to a plurality of hydraulic sources 4 through a pipeline, as shown in fig. 4, when one hydraulic source 4 fails, another hydraulic source 4 can provide continuous power through a pipeline, so that the success rate of the normal operation of a control surface supported by the hydraulic source is increased.

When the number of the second check valves 22 is greater than one, and the liquid inlet of each second check valve 22 is used for connecting one hydraulic source 4, that is, the number of the hydraulic sources 4 is the same as that of the second check valves 22, one hydraulic source 4 corresponds to one second check valve 22, and the oil inlet of the second check valve 22 is connected with the hydraulic source 4 through a pipeline, as shown in fig. 5, when one hydraulic source 4 fails, the other hydraulic source 4 can provide continuous power through the pipeline, so that the success rate of normal operation of a control surface supported by the hydraulic source 4 is improved.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a centering device according to an embodiment of the present invention, where the centering device includes: a modal conversion valve 1 and an actuating assembly;

the mimic switching valve 1 includes: valve housing 101, valve core 102, and elastomer 103;

the actuating assembly includes: a bore-type centering ram 104, two first check valves 105 and a piston rod 106;

valve barrel 101 is the closed hollow structure in both ends, be equipped with two pairs on hollow structure's the lateral wall and be used for the intercommunication the work interface of main work pipeline, wherein, each pair of work interface includes: a first interface 107 and a second interface 108;

the valve core 102 is a rod-shaped structure, and two shaft shoulders are respectively arranged on the rod-shaped structure;

the piston rod 106 is provided with a shaft shoulder;

two third interfaces 109 and a centering pipeline interface 110 for connecting the box body 3 are arranged on the cylinder arm of the wall hole type centering actuating cylinder 104, and the centering pipeline interface 110 is positioned between the two third interfaces 109;

the piston rod 106 is arranged in the cavity of the wall hole type centering actuating cylinder 104;

the valve core 102 is arranged in the cavity of the valve sleeve 101, a first end of the valve core 102 is fixedly provided with an elastic body 103, and a second end of the valve core penetrates through the closed end of the valve sleeve 101;

each third port 109 corresponds to one second port 108 and one first one-way valve 105, each third port 109 is respectively connected with a liquid outlet of one second port 108 and a liquid outlet of one first one-way valve 105, and a liquid inlet of each first one-way valve 105 is connected with the box body 3;

when the pressure of the second end is greater than the preset threshold, the shoulder of the piston rod 106 can move along the hole-type centering cylinder 104 under the action of the pressure output by the main working pipeline of the first port 107;

when the pressure which is not greater than the preset threshold value is input at the second end, a shaft shoulder of one valve core 102 corresponds to one first interface 107, the shaft shoulder of each valve core 102 is triggered to correspondingly seal one first interface 107, and if the external load direction borne by the piston rod 106 points to the loop pipeline interface 110 along the axial direction of the piston rod 106, the shaft shoulder of the piston rod 106 is triggered to seal the loop pipeline interface 110.

Therefore, the modal conversion valve provided by the embodiment of the invention is provided with the wall-hole type centering actuating cylinder, and the valve sleeve is provided with two pairs of working interfaces communicated with the main working pipeline, so that when the input pressure of the second end outputs high pressure, the shaft shoulder of the piston rod 106 can move along the wall-hole type centering actuating cylinder 104 under the action of the pressure output by the main working pipeline of the first interface 107, and the control surface is in a normal working state; when the input pressure at the second end outputs low pressure, the shaft shoulder of each valve core 102 is triggered to correspondingly seal one first interface 107, and if the external load direction applied to the piston rod 106 points to the loop-in-loop pipeline interface 110 along the axial direction of the piston rod 106, the shaft shoulder of the piston rod 106 is triggered to seal the loop-in-loop pipeline interface 110, so that the control surface can return to a neutral position, a pilot can conveniently control the airplane through other control surfaces, and the normal flight of the airplane is kept.

In one implementation, the elastomer 103 is a spring, which is simple and low cost.

In one implementation, a pair of loop interfaces is disposed on the end sidewall, and the pair of loop interfaces includes: a fourth interface 111 and a fifth interface 112; the end side wall is a side wall between the closed end of the hollow structure and a shoulder adjacent to the valve core 102;

the middle return pipeline interface 110 is connected to the fourth interface 111, and the fifth interface is used for connecting the box body 3.

Therefore, the realization mode not only realizes the communication between the loop pipeline interface 110 and the box body 3, but also saves the pipeline and reasonably realizes the layout of the pipeline.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.