CN216975902U

CN216975902U - Return valve, hydraulic suspension system and vehicle

Info

Publication number: CN216975902U
Application number: CN202123127501.0U
Authority: CN
Inventors: 黄杰; 黄飞; 杨智烨; 黄泰硕; 廖银生
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-07-15
Anticipated expiration: 2031-12-13

Abstract

The application relates to a reflux valve, a hydraulic suspension system and a vehicle, wherein the reflux valve comprises a valve sleeve, a main valve core, a one-way valve component, a main valve core resetting piece and an oil return valve seat; the inner side of the main valve core is provided with a middle channel extending along the axial direction of the main valve core, the first end opening of the oil inlet channel is an oil inlet, the outer peripheral wall of the main valve core is provided with a main valve core oil passing hole, and the outer peripheral wall of the valve sleeve is provided with an oil outlet; the check valve assembly is arranged in a middle passage so that the middle passage is communicated with the main valve core oil passing hole in a one-way mode; an oil return port is formed in the oil return valve seat, and the main valve core can open or close the oil return port; the force of the main spool reset member on the main spool causes the main spool to always have a tendency to move away from the return valve seat. The application discloses a return valve, check valve subassembly integration are in the main valve core, and this return valve has simple structure, small and advantage with low costs to installation maintenance is convenient.

Description

Return valve, hydraulic suspension system and vehicle

Technical Field

The application belongs to the technical field of valves and relates to a return valve, a hydraulic suspension system and a vehicle.

Background

The existing hydraulic suspension device comprises a distributor, an oil tank, an oil pump and a single-action master cylinder, wherein the distributor comprises a distributor shell, a main flow channel arranged in the distributor shell, a first flow channel communicated with the main flow channel, a second flow channel communicated with the main flow channel, a main return channel communicated with the main flow channel, a secondary return channel communicated with the main flow channel, a main control valve positioned in the main flow channel, a return valve for opening and closing the main return channel, and a one-way valve positioned in the first flow channel and used for communicating the first flow channel and the second flow channel. The oil tank is communicated with the main return channel through a main return pipe, the oil tank is communicated with the second flow channel through a safety pipeline, and a safety valve is arranged at one end, close to the second flow channel, of the safety pipeline. The oil pump is communicated with the main runner through an oil inlet pipe. The single-acting main oil cylinder is communicated with the second flow passage through an output oil pipe. When the main control valve is in the left position, the return valve is closed, and the oil pump supplies oil to the single-acting main oil cylinder through the one-way valve; when the main control valve is at the right position, the return valve is opened, the one-way valve is closed, and the oil of the oil pump and the single-acting main oil cylinder is unloaded to the oil tank through the return valve.

However, the above-described dispenser includes a valve assembly including a combination of a main control valve, a return valve, a check valve, and a safety valve, and the valve assembly has a complicated structure, a large volume, and high cost. The main control valve and the return valve are of a slide valve structure, and the oil pressure leakage amount is large. During unloading, the return oil is directly communicated with the oil pump, so that the risk of blockage or reverse rotation damage of the oil pump is caused. In addition, the entry of valve assembly does not set up filtration, and impurity can get into inside the valve assembly, has the risk of case jamming.

Disclosure of Invention

The technical problem that this application will solve is: the utility model provides a return valve, hydraulic suspension system and vehicle to the problem that the valve assembly structure of current hydraulic suspension device's distributor, by main control valve, return valve, check valve and relief valve combination is complicated.

In order to solve the technical problem, on one hand, the application provides a backflow valve, which comprises a valve sleeve, a main valve element, a one-way valve assembly, a main valve element reset part and a return valve seat, wherein the valve sleeve is provided with an inner cavity with two open ends, the inner cavity comprises an oil inlet channel and a main valve element installation cavity which are communicated with each other, the oil inlet channel is positioned in a first end of the valve sleeve, the return valve seat is connected to a second end of the valve sleeve, and the main valve element is arranged in the main valve element installation cavity in a sliding manner;

the inner side of the main valve core is provided with an intermediate channel extending along the axial direction of the main valve core, a first end opening of the oil inlet channel is an oil inlet, a first end opening of the intermediate channel is communicated with a second end opening of the oil inlet channel, a main valve core oil passing hole is formed in the outer peripheral wall of the main valve core, and an oil outlet communicated with the main valve core oil passing hole is formed in the outer peripheral wall of the valve sleeve;

the check valve assembly is arranged in the middle passage to enable the middle passage to be communicated with the main valve core oil passing hole in a one-way mode;

an oil return port is formed in the oil return valve seat, and the main valve core can open or close the oil return port;

the main valve core resetting piece is arranged between the main valve core and the oil return valve seat, and the force of the main valve core resetting piece acting on the main valve core enables the main valve core to always have the trend of moving away from the oil return valve seat.

Optionally, when the check valve assembly is opened, the oil inlet and the oil outlet are communicated through the intermediate passage, and the main valve element closes the oil return port;

when the one-way valve assembly is closed, the oil inlet is separated from the oil outlet, and the main valve core opens the oil return port.

Optionally, the check valve assembly includes a check valve seat, a ball and a ball reset member, the main valve core has a main valve core bore extending along an axial direction of the main valve core, a first end of the main valve core bore is open, a second end of the main valve core bore forms a closed end, the check valve seat is disposed in the main valve core bore, a check valve passage is disposed inside the check valve seat, a first end opening of the check valve passage is communicated with the oil inlet passage, a periphery of a second end opening of the check valve passage is provided with a ball contact surface, a first buffer cavity communicated with the main valve core oil through hole is formed between the ball contact surface and the closed end of the main valve core bore, the ball and the ball reset member are disposed in the first buffer cavity, and the check valve passage and the first buffer cavity constitute the intermediate passage;

the ball body resetting piece is connected between the ball body and the closed end of the inner hole of the main valve core, and the force of the ball body resetting piece acting on the ball body enables the ball body to always have the tendency of moving towards the ball body contact surface;

when the contact surface of the sphere is contacted with the sphere, the one-way valve passage is blocked from the main valve core oil passing hole; when the ball body is separated from the ball body contact surface, the one-way valve channel is communicated with the main valve core oil passing hole, so that hydraulic oil can flow from the oil inlet to the main valve core oil passing hole through the middle channel.

Optionally, the sphere contact surface is a first tapered surface, and the cross-sectional dimension of the first tapered surface gradually increases toward the sphere.

Optionally, the check valve passage includes a first check valve passage and a second check valve passage that are sequentially communicated from the first end to the second end, an inner diameter of the first check valve passage is greater than an inner diameter of the second check valve passage, and the inner diameter of the second check valve passage is smaller than a diameter of the ball.

Optionally, the ball return is a first spring.

Optionally, the main valve element comprises a main valve element first main body part, a main valve element second main body part and a valve rod which are sequentially connected from a first end to a second end, the outer diameters of the main valve element first main body part, the main valve element second main body part and the valve rod are sequentially reduced, the main valve element first main body part is in sliding fit with the inner wall of the main valve element mounting cavity, the main valve element oil passing hole is formed in the outer peripheral wall of the main valve element second main body part, a second buffer cavity is formed between the main valve element second main body part and the valve rod and the inner wall of the main valve element mounting cavity, and the second buffer cavity is communicated between the main valve element oil passing hole and the oil outlet;

the valve rod is provided with a spherical surface protruding towards the oil return valve seat, and the periphery of the first end opening of the oil return valve seat is provided with a valve rod contact surface; when the spherical surface of the valve rod is contacted with the contact surface of the valve rod, the oil return port is separated from the oil outlet; when the spherical surface of the valve rod is separated from the contact surface of the valve rod, the oil return port is communicated with the oil outlet through the second buffer cavity.

Optionally, the valve stem contact surface is a second tapered surface, and the second tapered surface gradually increases in cross-sectional dimension in a direction toward the valve stem.

Optionally, the cross-sectional size of the oil return opening gradually increases from the first end to the second end, and the inner diameter of the first end of the oil return opening is smaller than the diameter of the spherical surface.

Optionally, the main valve element reset element is a second spring, and the second spring is sleeved on the valve rod and supported between the main valve element second main body part and the oil return valve seat.

Optionally, one or more annular grooves are formed in the outer peripheral wall of the first main valve element body.

Optionally, the inner diameter of the oil inlet channel is smaller than the inner diameter of the main valve element mounting cavity, and an annular surface is formed at the joint of the oil inlet channel and the main valve element mounting cavity;

when the oil return port is closed, gaps are reserved between the first end face of the main valve core and the first end face of the one-way valve seat and the annular face; when the oil return opening is opened to the maximum, at least one of the first end surface of the main valve core and the first end surface of the one-way valve seat is abutted against the annular surface.

Optionally, a plurality of main valve core oil passing holes are formed, and the main valve core oil passing holes are uniformly distributed along the circumferential direction of the main valve core;

the oil outlets are arranged in a plurality and are uniformly distributed along the circumferential direction of the valve sleeve.

Optionally, the return valve further comprises a filter screen disposed in the oil inlet passage.

Optionally, a first sealing ring groove is formed in the peripheral wall of the first end of the valve sleeve, and the backflow valve further comprises a first sealing ring arranged in the first sealing ring groove;

a second sealing ring groove is formed in the peripheral wall of the second end of the valve sleeve, and the backflow valve further comprises a second sealing ring arranged in the second sealing ring groove; first sealed annular groove is located the radial outside of oil feed passageway, second sealed annular groove is located the radial outside of oil return disk seat, the oil-out is in the axial of valve barrel is located between first sealed annular groove and the second sealed annular groove.

According to the return valve of the embodiment of the application, the inner side of the main valve core is provided with the intermediate channel extending along the axial direction of the main valve core, the one-way valve assembly is arranged in the intermediate channel, so that hydraulic oil can only flow from the oil inlet to the main valve core oil passing hole arranged on the outer peripheral wall of the main valve core through the intermediate channel, and the main valve core oil passing hole is communicated with the oil outlet on the valve sleeve. That is, hydraulic oil can only flow from the oil inlet to the oil outlet. Like this, the check valve subassembly is integrated in the main valve core, and this backward flow valve can realize the function of backward flow, can realize the function of check valve again, has simple structure, small and advantage with low costs to installation maintenance is convenient.

On the other hand, this application embodiment still provides a hydraulic suspension system, including oil pump, oil storage device, hydraulic suspension and foretell return valve, the oil inlet is through advancing oil pipe connection the oil pump, the oil-out is through going out oil pipe connection hydraulic suspension, the oil return opening is through returning oil pipe connection the oil storage device.

In still another aspect, the embodiment of the present application further provides a vehicle, which includes the hydraulic suspension system.

Drawings

FIG. 1 is a schematic view of a backflow valve provided by an embodiment of the present application (backflow port closed, check valve open);

FIG. 2 is a schematic view of a return valve provided in an embodiment of the present application (return port open, check valve closed);

FIG. 3 is an assembly view of a main valve core and check valve assembly provided in accordance with an embodiment of the present application.

The reference numerals in the specification are as follows:

1. a valve housing; 11. an oil inlet channel; 12. a main valve element mounting cavity; 13. an annular face; 14. a first seal ring groove; 15. a second seal ring groove; 2. a main valve element; 21. the main valve core oil passing hole; 22. an inner hole of the main valve element; 23. a closed end; 24. a main spool first body portion; 241. an annular groove; 25. a main spool second body portion; 26. a valve stem; 261. spherical surface; 3. a one-way valve assembly; 31. a one-way valve seat; 311. a one-way valve passage; 3111. a first check valve passage; 3112. a second one-way valve passage; 312. a sphere contact surface; 32. a sphere; 33. a sphere reset member; 4. a main spool reset; 5. an oil return valve seat; 51. a valve stem contact surface; 6. a filter screen; 7. a first seal ring; 8. a second seal ring; q1, a first buffer chamber; q2, a second buffer chamber; p, an oil inlet; A. an oil outlet; t, an oil return port; m, a middle channel.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Referring to fig. 1 to 3, the backflow valve provided in the embodiment of the present application includes a valve housing 1, a main valve element 2, a check valve assembly 3, a main valve element reset element 4, and an oil return valve seat 5, where the valve housing 1 has an inner cavity with openings at two ends, the inner cavity includes an oil inlet channel 11 and a main valve element installation cavity 12 that are communicated with each other, the oil inlet channel is located in a first end of the valve housing 1, the oil return valve seat 5 is connected to a second end of the valve housing 1, and the main valve element 2 is slidably disposed in the main valve element installation cavity 12.

An intermediate channel M extending along the axial direction of the main valve element 2 is arranged on the inner side of the main valve element 2, a first end opening of the oil inlet channel 11 is an oil inlet P, a first end opening of the intermediate channel M is communicated with a second end opening of the oil inlet channel 11, a main valve element oil passing hole 21 is arranged on the outer peripheral wall of the main valve element 2, and an oil outlet A communicated with the main valve element oil passing hole 21 is arranged on the outer peripheral wall of the valve sleeve 1.

The check valve assembly 3 is provided in the intermediate passage M to make the intermediate passage M communicate one-way to the main spool oil passing hole 21. That is, the hydraulic oil can flow only to the main spool oil passing hole 21 from the intermediate passage M, and cannot flow in the reverse direction. Thus, hydraulic oil can flow from the oil inlet P to the main spool oil passing hole 21 through the intermediate passage M, and then flow into the oil outlet a through the main spool oil passing hole 21. The path of the oil inlet P, the middle channel M and the oil outlet A is a passage, and the path of the oil outlet A towards the direction of the oil inlet P is cut off.

An oil return port T is formed in the oil return valve seat 5, and the main valve element 2 can open or close the oil return port T.

Main valve element reset 4 is arranged between main valve element 2 and return valve seat 5, the force of main valve element reset 4 acting on main valve element 2 always having a tendency to move main valve element 2 away from return valve seat 5.

The check valve component 3 is integrated in the main valve element 2, the backflow valve can realize the backflow function and the check valve function, and the check valve has the advantages of simple structure, small size and low cost, and is convenient to install and maintain.

Here, the left end in fig. 1 is a first end, and the right end in fig. 1 is a second end. Namely, the end where the oil inlet P is located is a first end, and the end where the oil return port T is located is a second end.

In one embodiment, when the check valve assembly 3 is opened, the oil inlet P and the oil outlet a are communicated through the middle channel M, and the main valve element 2 closes the oil return port T; when the one-way valve assembly 3 is closed, the oil inlet P is separated from the oil outlet A, and the main valve element 2 opens the oil return port T. Namely, when oil is fed, the oil return port T is closed; during oil drainage, the oil inlet P is separated from the oil outlet A, and the oil outlet A is communicated with the oil return port T to drain oil. According to the reflux valve, different channels are adopted for oil drainage and oil inlet, and oil drainage and oil inlet are respectively carried out without mutual influence, so that impurities possibly existing in oil return cannot enter the oil inlet part, the safe use of the whole reflux valve is facilitated, and other parts cannot be damaged due to the fact that the impurities enter the oil inlet part, such as blocking or reversing of an oil pump and the like.

In one embodiment, referring to fig. 1-3, the check valve assembly 3 includes a check valve seat 31, a ball 32 and a ball reset member 33, the main valve element 2 has a main valve element bore 22 extending along an axial direction thereof, a first end of the main valve element bore 22 is open, a second end of the main valve element bore 22 forms a closed end 23, the check valve seat 31 is disposed in the main valve element bore 22, and the check valve seat 31 is fixedly connected to or integrally formed with the main valve element. The check valve seat 31 is internally provided with a check valve passage 311, a first end opening of the check valve passage 311 is communicated with the oil inlet passage 11, the periphery of a second end opening of the check valve passage 311 is provided with a ball contact surface 312, a first buffer cavity Q1 communicated with the main valve core oil passing hole 21 is formed between the ball contact surface 312 and the closed end 23 of the main valve core inner hole 22, the ball 32 and the ball resetting piece 33 are arranged in the first buffer cavity Q1, and the check valve passage 311 and the first buffer cavity Q1 form an intermediate passage M.

A ball return 33 is connected between the ball 32 and the closed end 23 of the main valve bore 22, the force of the ball return 33 on the ball 32 always having a tendency to move the ball 32 towards the ball contact surface 312.

When the ball 32 contacts the ball contact surface 312, the check valve passage 311 is blocked from the main spool oil passing hole 21; when the ball 32 is disengaged from the ball contact surface 312, the check valve passage 311 communicates with the main spool oil passing hole 21, so that hydraulic oil can flow from the oil inlet P to the main spool oil passing hole 21 through the intermediate passage M.

The ball 32 may be a steel ball, for example.

In one embodiment, the ball contact surface 312 is a first tapered surface, and the cross-sectional dimension of the first tapered surface increases toward the ball 32. In this way, the contact between the spherical body 32 (spherical surface) and the spherical body contact surface 312 is line contact (line seal), and the spherical body 32 and the spherical body contact surface 312 form a seat valve structure of line seal, so that the sealing reliability when the spherical body 32 and the spherical body contact surface 312 are contacted is ensured, and the leakage of hydraulic oil at the contact position is reduced.

In one embodiment, referring to fig. 3, the check valve passage 311 includes a first check valve passage 3111 and a second check valve passage 3112 sequentially communicated from the first end to the second end, the first check valve passage 3111 has an inner diameter larger than that of the second check valve passage 3112, and the second check valve passage 3112 has an inner diameter smaller than that of the ball 32. Thus, ball 32 does not snap into second one-way valve passage 3112.

In one embodiment, referring to fig. 3, the ball return 33 is a first spring. The first spring may be a coil spring as shown in fig. 3, or may be a leaf spring, elastic rubber, or the like.

In an embodiment, referring to fig. 1 to 3, the main spool 2 includes a main spool first main body portion 24, a main spool second main body portion 25, and a valve stem 26 connected in sequence from a first end to a second end thereof, the outer diameters of the main spool first main body portion 24, the main spool second main body portion 25, and the valve stem 36 decrease in sequence, the main spool first main body portion 24 is in sliding fit with the inner wall of the main spool mounting cavity 12, the main spool oil passing hole 21 is disposed on the outer peripheral wall of the main spool second main body portion 25, a second buffer cavity Q2 is formed between the main spool second main body portion 25 and the valve stem 26 and the inner wall of the main spool mounting cavity 12, and the second buffer cavity Q2 is communicated between the main spool oil passing hole 21 and the oil outlet a.

The valve rod 26 is provided with a spherical surface 261 protruding towards the return valve seat 5, and the periphery of the first end opening of the return valve seat 5 is provided with a valve rod contact surface 51; when the spherical surface 261 of the valve rod 26 contacts with the valve rod contact surface 51, the oil return port T is isolated from the oil outlet A; when the spherical surface 261 of the valve rod 26 is disengaged from the valve rod contact surface 51, the oil return port T communicates with the oil outlet port a through the second surge chamber Q2.

In one embodiment, the valve stem contacting surface 51 is a second tapered surface that increases in cross-sectional dimension in a direction toward the valve stem 26. Thus, the contact between the valve rod 26 (spherical surface 261) and the valve rod contact surface 51 is line contact (line seal), which ensures the sealing reliability when the valve rod 26 contacts the valve rod contact surface 51, and reduces the leakage of the hydraulic oil at the contact position.

In one embodiment, the cross-sectional size of the oil return port T gradually increases from the first end to the second end, and the inner diameter of the first end of the oil return port T is smaller than the diameter of the spherical surface 261. To prevent the valve stem 26 from snapping into the oil return T. The oil return port T is gradually enlarged from the first end to the second end in section size, and rapid oil drainage is facilitated.

In one embodiment, referring to fig. 1, main spool return 4 is a second spring that is mounted on stem 26 and supported between main spool second body portion 25 and return seat 5. The second spring may be a coil spring as shown in fig. 1, or may be a leaf spring, elastic rubber, or the like.

In one embodiment, referring to FIG. 3, the outer peripheral wall of the main spool first body portion 24 is provided with one or more annular grooves 241. Three annular grooves 241 are shown for example, but may be one, two or another number as desired. The cross section of the annular groove 241 may be triangular, rectangular, etc. Annular groove 241 prevents main spool 2 from becoming jammed due to uneven forces on the circumference of main spool 2.

In one embodiment, referring to fig. 1, the inner diameter of oil inlet channel 11 is smaller than the inner diameter of main valve element mounting cavity 12, and an annular surface 13 is formed at the junction of oil inlet channel 11 and main valve element mounting cavity 12. As shown in fig. 1, when the return port T is closed, there is a gap between the first end surface of main valve element 2 and the first end surface of one-way valve seat 31 and annular surface 13, and this gap provides a space for movement of main valve element 2. When the oil return port T is opened to the maximum, at least one of the first end surface of the main spool 2 and the first end surface of the check valve seat 31 abuts against the annular surface 13.

For example, when the first end surface of main valve element 2 is flush with the first end surface of check valve seat 31, the first end surface of main valve element 2 and the first end surface of check valve seat 31 simultaneously abut annular surface 13 when oil return port T is opened to the maximum. When the first end face of main valve element 2 protrudes beyond the first end face of one-way valve seat 31, the first end face of main valve element 2 abuts annular surface 13 when oil return port T is opened to the maximum. When the first end surface of the check valve seat 31 protrudes beyond the first end surface of the main valve element 2, the first end surface of the check valve seat 31 abuts against the annular surface 13 when the oil return port T is opened to the maximum.

In an embodiment, referring to fig. 3, the main spool oil passing holes 21 are provided in plurality, and the plurality of main spool oil passing holes 21 are evenly distributed in the circumferential direction of the main spool 2. The number of the main valve core oil passing holes 21 can be 2-4.

In an embodiment, referring to fig. 3, the oil outlet a is provided in plurality, and the plurality of oil outlets a are evenly distributed along the circumferential direction of the valve housing 1. The number of the oil outlets A can be 2-4. A plurality of evenly distributed's oil-out A play increase logical oil area, reduce loss of pressure's effect, can avoid main valve element 2 circumference to receive the inhomogeneous problem of hydraulic pressure radial force simultaneously.

In an embodiment, referring to fig. 1, the return valve further comprises a filter screen 6 arranged in the oil inlet channel 11. The filter screen 6 can prevent impurities from entering the return valve and the back end system of the return valve, and prevent the main valve element 2 from being blocked and polluting the back end system of the return valve.

In an embodiment, referring to fig. 1, the outer peripheral wall of the first end of the valve sleeve 1 is provided with a first sealing ring groove 14, and the backflow valve further comprises a first sealing ring 7 arranged in the first sealing ring groove 14; a second sealing ring groove 15 is formed in the peripheral wall of the second end of the valve sleeve 1, and the backflow valve further comprises a second sealing ring 8 arranged in the second sealing ring groove 15; the first sealing ring groove 14 is located on the radial outer side of the oil inlet channel 11, the second sealing ring groove 15 is located on the radial outer side of the oil return valve seat 5, and the oil outlet A is located between the first sealing ring groove 14 and the second sealing ring groove 15 in the axial direction of the valve sleeve 1. Two ends are adopted for sealing, and the backflow valve is arranged in the shell in a sealing mode, so that the sealing effect is better. The first sealing ring 7 can block the oil inlet P and the oil outlet A, so that the oil inlet P and the oil outlet A are prevented from being communicated in an oil-crossing manner; the second sealing ring 8 can block the oil outlet A and the oil return port T, and the oil outlet A and the oil return port T are prevented from being communicated in an oil-crossing mode.

The first seal ring 7 and the second seal ring 8 may be, for example, O-rings.

According to the return valve of the embodiment of the present application, the inner side of the main spool 2 is provided with the intermediate passage M extending in the axial direction thereof, and the check valve assembly 3 is provided in the intermediate passage M so that hydraulic oil can flow only from the oil inlet P to the main spool oil passing hole 21 provided on the outer peripheral wall of the main spool 2 through the intermediate passage M, and the main spool oil passing hole 21 communicates with the oil outlet P on the valve housing 1. That is, hydraulic oil can only flow from the oil inlet P to the oil outlet a. In this way, the one-way valve assembly 3 is integrated in the main valve element 2, and the backflow valve has the advantages of simple structure, small size and low cost, and is convenient to install and maintain.

In addition, this application embodiment still provides a hydraulic suspension system, including oil pump, oil storage device, hydraulic suspension and the backwash valve of above-mentioned embodiment, oil inlet P is through advancing oil pipe connection oil pump, and oil-out A is through going out oil pipe connection hydraulic suspension, and oil return opening T is through returning oil pipe connection oil storage device. The oil storage device is, for example, a tank or a can.

When the application discloses return valve is applied to hydraulic suspension system, its theory of operation as follows:

as shown in fig. 1, when the oil pump works, hydraulic oil enters from an oil inlet P, impurities are filtered by the filter screen 6 in the oil inlet channel 11, the hydraulic oil flows into the check valve channel 311 through the oil inlet channel 11, when the thrust of the pressure difference between the oil inlet P and the oil outlet a to the sphere 32 is greater than the elastic force of the sphere reset piece 33 (first spring), the sphere 32 moves to the right (moves in the direction away from the sphere contact surface 312), at this time, the check valve component 3 opens (the second end opening of the check valve channel 311 opens), and simultaneously, under the combined action of the pressure difference and the force bearing area difference, when the thrust applied to the main valve core 2 is greater than the elastic force of the main valve core reset piece 4 (second spring), the main valve core 2 moves to the right (moves in the direction close to the oil return valve seat 5), at this time, the oil outlet a is not communicated with the oil return port T, after the hydraulic oil passes through the check valve channel 311, the first buffer chamber Q1, the main valve core through the oil hole 21 and the second buffer chamber Q2, enters the oil outlet A and supplies oil to the hydraulic suspension.

As shown in fig. 2, when the oil pump does not work, the oil inlet P has no pressure, the return oil of the hydraulic suspension enters from the oil outlet a, the ball 32 is under the combined action of the pressure of the oil outlet a and the ball resetting member 33 (the first spring), the check valve assembly 3 is closed (the second end opening of the check valve passage 311 is closed), and at this time, the oil outlet a is not communicated with the oil inlet P, so as to protect the oil pump. Meanwhile, main valve element 2 moves to the left (moves in the direction far away from return valve seat 5) under the combined action of the pressure of oil outlet a and main valve element reset element 4 (second spring), at this time, oil outlet a is communicated with oil return port T, and hydraulic oil returns to an oil tank or an oil can through oil return port T on return valve seat 5.

In addition, the embodiment of the application also provides a vehicle, which comprises the hydraulic suspension system.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A backflow valve is characterized by comprising a valve sleeve, a main valve element, a one-way valve assembly, a main valve element resetting piece and an oil return valve seat, wherein the valve sleeve is provided with an inner cavity with openings at two ends, the inner cavity comprises an oil inlet channel and a main valve element installation cavity which are communicated with each other, the oil inlet channel is positioned in a first end of the valve sleeve, the oil return valve seat is connected to a second end of the valve sleeve, and the main valve element is arranged in the main valve element installation cavity in a sliding mode;

2. The backflow valve of claim 1, wherein when said check valve assembly is open, said oil inlet and outlet communicate through said intermediate passage, said main spool closing said oil return port;

3. The reflux valve as set forth in claim 1, wherein said one-way valve assembly includes a one-way valve seat, a ball and a ball return, the main spool has a main spool bore extending axially therealong, the main spool bore being open at a first end, the second end of the inner hole of the main valve core forms a closed end, the one-way valve seat is arranged in the inner hole of the main valve core, a one-way valve passage is arranged in the one-way valve seat, a first end opening of the one-way valve passage is communicated with the oil inlet passage, a ball contact surface is arranged on the periphery of the opening at the second end of the one-way valve channel, a first buffer cavity communicated with the oil passing hole of the main valve core is formed between the ball contact surface and the closed end of the inner hole of the main valve core, the ball body and the ball body resetting piece are arranged in the first buffer cavity, and the one-way valve channel and the first buffer cavity form the middle channel;

4. The reflux valve as set forth in claim 3, wherein said ball contacting surface is a first tapered surface having a cross-sectional dimension that increases in a direction toward said ball.

5. The reflux valve as set forth in claim 3, wherein said check valve passage includes a first check valve passage and a second check valve passage in communication from a first end to a second end, said first check valve passage having an inner diameter greater than an inner diameter of said second check valve passage, said second check valve passage having an inner diameter less than a diameter of said ball.

6. The reflux valve as set forth in claim 3, wherein said ball return is a first spring.

7. The backflow valve according to claim 3, wherein the main spool includes a main spool first main body portion, a main spool second main body portion, and a stem sequentially connected from a first end to a second end thereof, outer diameters of the main spool first main body portion, the main spool second main body portion, and the stem sequentially decrease, the main spool first main body portion is slidably fitted to an inner wall of the main spool mounting cavity, the main spool oil passing hole is provided in an outer peripheral wall of the main spool second main body portion, a second buffer cavity is formed between the main spool second main body portion and the stem and the inner wall of the main spool mounting cavity, and the second buffer cavity communicates between the main spool oil passing hole and the oil outlet;

8. The reflux valve as set forth in claim 7, wherein said stem contact surface is a second tapered surface that increases in cross-sectional dimension in a direction toward said stem.

9. The reflux valve as set forth in claim 7, wherein said oil return port has a cross-sectional dimension that increases from a first end to a second end, said first end of said oil return port having an inner diameter that is less than a diameter of said spherical surface.

10. The backflow valve of claim 7, wherein said main spool return element is a second spring disposed about said stem and supported between said main spool second body portion and a return seat.

11. The backflow valve of claim 7, wherein the main spool first body portion peripheral wall is provided with one or more annular grooves.

12. The backflow valve of claim 3, wherein an inner diameter of the oil inlet passage is smaller than an inner diameter of the main poppet mounting cavity, and an annular surface is formed at a junction of the oil inlet passage and the main poppet mounting cavity;

13. The return valve according to claim 1, wherein the main spool oil passing hole is provided in plurality, and the plurality of main spool oil passing holes are evenly distributed in a circumferential direction of the main spool;

14. The backflow valve of claim 1, further comprising a filter screen disposed within said oil intake passage.

15. The reflux valve as set forth in claim 1, wherein said first end peripheral wall of said housing defines a first sealing ring groove, said reflux valve further including a first sealing ring disposed in said first sealing ring groove;

16. A hydraulic suspension system, comprising an oil pump, an oil storage device, a hydraulic suspension and the return valve of any one of claims 1 to 15, wherein the oil inlet is connected to the oil pump through an oil inlet pipeline, the oil outlet is connected to the hydraulic suspension through an oil outlet pipeline, and the oil return port is connected to the oil storage device through an oil return pipeline.

17. A vehicle comprising the hydraulic suspension system of claim 16.