CN111379756A - pressure compensation valve - Google Patents

Abstract

The invention provides a pressure compensation valve, which comprises a valve seat, a valve sleeve, an elastic piece and a valve core assembly, wherein the valve seat is sleeved and fixedly connected with the valve sleeve; the valve sleeve is provided with an oil supply port, a priority port and a bypass port, one end of the valve sleeve, which is far away from the valve seat, forms an induction oil port, the induction oil port and the priority port are communicated with the valve seat cavity, the induction oil port is communicated with an external main oil way, and the valve core assembly reciprocates relative to the valve sleeve under the driving of oil pressure at the priority port and the induction oil port and adjusts the circulation state between the oil supply port and the priority port and between the oil supply port and the bypass port. According to the pressure compensation valve provided by the invention, the sensing oil port communicated with the external main oil way is arranged, so that load fluctuation is introduced into the adjusting process of the valve core, and the influence of the load fluctuation on the priority flow is reduced.

Description

pressure compensation valve

technical field

The present invention relates to the technical field of fluid control, in particular to a pressure compensation valve for fluid control.

Background technique

The pressure compensation valve can provide a stable and constant flow for the load connected to the priority port, and only when the oil supply exceeds the load demand of the priority port will oil be supplied to the bypass port. There are a wide range of applications in hydraulic control systems. However, the existing pressure compensation valve cannot eliminate the influence of the pressure fluctuation of the entire load in the main oil circuit on the flow of the priority port, and there is a large fluctuation error between the actual oil supply amount of the priority port and the theoretical oil supply amount, which reduces the pressure compensation valve. adjustment accuracy.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide an improved pressure compensation valve, which can reduce the influence of load pressure fluctuations on the priority flow and has high adjustment accuracy.

The invention provides a pressure compensation valve. The pressure compensation valve includes a valve seat, a valve sleeve, an elastic member and a valve core assembly. The valve seat is sleeved and fixedly connected to the valve sleeve, and the valve seat is provided with a valve seat. a valve seat cavity, the elastic piece is sleeved with the valve core assembly and accommodated in the valve seat cavity of the valve seat, the valve core assembly is accommodated in the valve sleeve, and one end of the elastic piece is abutted against the valve core assembly, the other end abuts the valve sleeve;

The valve sleeve is provided with an oil supply port, a priority port and a bypass port, and an end of the valve sleeve away from the valve seat forms a sensing oil port, and the sensing oil port and the priority port communicate with the valve seat cavity, so The induction oil port is connected to the external main oil circuit, and the valve core assembly reciprocates relative to the valve sleeve under the driving of the oil pressure at the priority port and the induction oil port, and adjusts the distance between the oil supply port and the priority port. The flow state between the oil supply port and the bypass port.

Further, the valve core assembly includes a valve core, and an oil passage groove that communicates with the oil supply port is opened on the valve core, and the oil supply port communicates with the priority port and the bypass port through the oil passage groove.

Further, the valve core is provided with a damping hole, and the damping hole is used to buffer the reciprocating sliding of the valve core relative to the valve sleeve.

Further, the valve core is provided with a valve core cavity extending in the axial direction and communicating with the valve seat cavity, the damping hole includes a first damping hole, and the sensing oil port communicates with the other through the first damping hole. the valve seat cavity.

Further, the valve sleeve is provided with an oil passage, the damping hole includes a second damping hole, and the priority port communicates with the valve core cavity through the oil passage and the second damping hole.

Further, the valve core cavity includes an expansion cavity that communicates with the valve seat cavity and an extension cavity that communicates with the sensing oil port, the valve core assembly includes a mounting seat, and the mounting seat is disposed in the extending cavity;

The damping hole includes a third damping hole, the third damping hole is opened on the mounting seat and communicates with the expansion cavity, and the sensing oil port communicates with the valve seat cavity through the third damping hole.

Further, the mounting seat and the valve core are fixed to each other by at least one of screw connection, key connection and pin connection.

Further, a portion of the oil passage groove corresponding to the bypass port is set as a curved surface.

Further, the valve core assembly further includes a fixing seat, the fixing seat is sleeved and fixed on the valve core, and one end of the fixing seat is supported by the elastic member.

Further, a gasket is provided on one end of the valve sleeve extending into the valve seat, the gasket sleeves the valve core and is pressed on the valve sleeve under the resistance of the elastic member; One end of the elastic member is against the fixing seat, and the other end is against the gasket.

The pressure compensation valve provided by the present invention introduces load fluctuations into the adjustment process of the valve core by arranging a sensing oil port that communicates with the external main oil circuit, thereby reducing the influence of load pressure fluctuations on the priority flow, thereby improving the accuracy of adjustment, and has the advantages of: Broad application prospects.

Description of drawings

1 is a schematic structural diagram of a pressure compensation valve in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the valve core in the pressure compensation valve shown in FIG. 1;

FIG. 3 is an enlarged schematic view of the pressure compensation valve shown in FIG. 1 at A. FIG.

Description of main component symbols

The following specific embodiments will further illustrate the present invention in conjunction with the above drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that when a component is referred to as being "mounted on" another component, it can be directly mounted on the other component or there may also be an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component. When a component is said to be "fixed" to another component, it may be directly fixed to the other component or there may also be an intervening component.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Please refer to FIG. 1 , which is a schematic structural diagram of a pressure compensation valve 100 in an embodiment of the present invention. The pressure compensation valve 100 provided by the present invention is used to provide a stable and constant fluid flow to the target load, so as to provide a suitable driving flow for the operation of the load.

The pressure compensation valve 100 includes a valve sleeve 10 , a valve seat 20 , a valve core assembly 30 and an elastic member 40 . The valve seat 20 sleeves one end of the valve sleeve 10 and is fixedly connected to the valve sleeve 10 , and the valve core assembly 30 is accommodated inside the valve sleeve 10 . The elastic member 40 is sleeved with one end of the valve sleeve 10 that extends into the valve seat 20 and is accommodated in the valve seat 20 . The valve sleeve 10 is used to accommodate the valve core assembly 30, the valve seat 20 is used to fix the valve sleeve 10, the valve core assembly 30 is used to control the valve opening degree of the pressure compensation valve 100, and the elastic member 40 is used to provide a pre-tightening force to adjust the valve core The equilibrium state the assembly 30 is in.

Under the support of the valve sleeve 10 and the valve seat 20, the valve core assembly 30 overcomes the pre-tightening force provided by the elastic member 40 and changes its position relative to the valve sleeve 10 under the driving of oil pressure, thereby adjusting the opening of the pressure compensation valve 100. The valve degree is adjusted to adjust the oil intake of the load connected with the pressure compensation valve 100 and control the operation state of the load.

Specifically, the valve sleeve 10 is roughly in the shape of a hollow cylinder, and its interior is hollow and forms a valve sleeve cavity 11 for the valve core assembly 30 to slide. The valve sleeve 10 has two ends, a first end 10a and a first end 10a respectively. The second end 10b of the back. The first end 10 a of the valve sleeve 10 is mounted on the valve seat 20 , so as to realize the fixed connection between the valve sleeve 10 and the valve seat 20 .

Further, the valve seat 20 is sleeved with the first end 10a of the valve sleeve 10, the outer side surface of the first end 10a of the valve sleeve 10 is threadedly connected with the inner side surface of the valve seat 20, and the valve sleeve 10 and the valve seat 20 are screwed together to achieve The fixed connection between the valve sleeve 10 and the valve seat 20 .

It can be understood that, in other embodiments, the valve sleeve 10 and the valve seat 20 can also be fixed to each other in other detachable connection manners such as key connection, pin connection and the like.

The second end 10b of the valve sleeve 10 forms a sensing oil port 12, and the sensing oil port 12 communicates with the valve sleeve cavity 11. The oil pressure at the sensing oil port 12 is equal to the oil pressure required by the load, which can sense the oil pressure required by the load. The oil pressurizes and drives the spool assembly 30 to move.

Further, the cylinder wall of the valve sleeve 10 is provided with an oil supply port 13 , a priority port 14 and a bypass port 15 , and the oil supply port 13 , the priority port 14 and the bypass port 15 are all in phase with the valve sleeve cavity 11 of the valve sleeve 10 . Connected, the oil supply port 13 is located between the priority port 14 and the bypass port 15 . The oil supply port 13 is used to supply hydraulic oil to the pressure compensation valve 100. The priority port 14 and the bypass port 15 are both connected to the load. When the oil supply port 13 is in communication with the priority port 14 or the bypass port 15, it is The load correspondingly connected to the port 14 or the bypass port 15 will operate under the oil supply of the oil supply port 13, so as to realize the working process of distributing the oil through the pressure compensation valve 100 and controlling the different operating states of the load.

Further, the load communicated with the priority port 14 has a higher working priority than the load communicated with the bypass port 15, and the pressure compensation valve 100 preferentially supplies the oil to the priority port 14 when distributing the oil. load, ensure the full power operation of the load connected to the priority port 14. Only when the oil demand of the load connected to the priority port 14 has been satisfied by the supply of the oil supply port 13, the excess oil will be supplied to the load connected to the bypass port 15, that is, the pressure compensation The valve 100 will supply oil to the bypass port 15 only after the priority port 14 demand has been met.

It can be understood that the number of the oil supply port 13 , the priority port 14 and the bypass port 15 may be one or multiple. In this embodiment, there are multiple oil supply ports 13 , priority ports 14 and bypass ports 15 , and the multiple oil supply ports 13 are distributed one by one along the circumferential direction of the valve sleeve 10 , and are located at the center of the valve sleeve 10 . The axis is the axis and the center is symmetrically distributed; similarly, the plurality of priority ports 14 are distributed one by one along the circumferential direction of the valve sleeve 10, and are centrally symmetrically distributed with the central axis of the valve sleeve 10 as the axis, and the plurality of bypass ports 15 are also distributed. They are distributed one by one along the circumferential direction of the valve sleeve 10 , and are distributed centrally symmetrically with the central axis of the valve sleeve 10 as the axis.

Further, the outer wall of the valve sleeve 10 is provided with a plurality of installation grooves (not numbered) along the circumferential direction, each installation groove is installed with a sealing member 16 and a retaining ring 17, and the plurality of sealing members 16 are sleeved on the valve sleeve 10. The peripheral wall is spaced apart from each other along the central axis of the valve sleeve 10. The seal 16 is used to seal the pressure compensation valve 100 and the external hydraulic components; Axial movement of the seal 16 is limited.

In this embodiment, the sealing member 16 is an O-ring. It can be understood that, in other embodiments, the sealing member 16 may also be other types of sealing members such as a V-shaped sealing ring, a sealing packing, and the like.

The valve seat 20 is roughly cylindrical, and a valve seat cavity 21 extending along its axial direction is opened inside. The valve seat cavity 21 only penetrates one end face of the valve seat 20 . Screwed and fixed, the valve seat 20 is provided for the valve sleeve 10 to be installed.

The outer side of the valve seat 20 is also provided with a number of seals (not shown), the seals are used to seal the valve seat 20 and the external hydraulic system.

Please also refer to FIG. 2 . FIG. 2 is a schematic structural diagram of the valve core 31 of the pressure compensation valve 100 shown in FIG. 1 .

The valve core assembly 30 includes a valve core 31 , and the valve core 31 is substantially cylindrical in multiple sections. The valve core 31 is accommodated in the valve sleeve cavity 11 of the valve sleeve 10 and can slide back and forth in the valve sleeve 10 . The outer surface of the valve core 31 is radially recessed and forms an oil passage groove 311 . The oil passage groove 311 extends substantially in a direction parallel to the axial direction of the valve core 31 and reduces the size of the partial shaft section of the valve core 31 . The oil passage 311 communicates with the oil supply port 13 ; when the valve core 31 reaches the position where the oil passage 311 and the priority port 14 are completely connected, the bypass port 15 is not communicated with the oil passage 311 at this time. That is, the valve body 31 has a first position, and the oil passage groove 311 on the valve body 31 in the first position communicates with the priority port 14 and does not communicate with the bypass port 15 .

When the valve core 31 moves towards the direction of the sensing oil port 12 of the valve sleeve 10 for a certain distance, the position of the oil channel 311 will change with the movement of the valve core 31, and the oil channel 311 will continue to maintain communication with the oil supply port 13. The oil groove 311 will also communicate with the bypass port 15 with the movement of the valve core 31 , and at this time, the oil communication groove 311 and the priority port 14 continue to communicate. That is, the valve core 31 has a second position, and the valve core 31 in the second position has an oil passage 311 in communication with the priority port 14 and also communicates with the bypass port 15 .

A valve core cavity 312 is opened at the approximate center of the valve core 31. The valve core cavity 312 extends along the axial direction of the valve core 31 and penetrates through two end faces of the valve core 31. One end of the valve core cavity 312 is connected to the sensing oil port 12, and the other end is connected to the sensing oil port 12. The valve seat cavity 21 is communicated. The spool cavity 312 is used to guide the oil in the sensing oil port 12 to the valve seat cavity 21, so that the sensing oil port 12 can push the spool 31 toward the sensing oil port 12 (the direction shown in FIG. 1 is downward). Swipe in the direction.

In the same principle, in order to realize the mutual communication between the priority port 14 and the valve seat cavity 21, so that the fluid pressure at the priority port 14 can be transmitted into the valve seat cavity 21 and push the valve core 31 to move, the peripheral wall of the valve sleeve 10 is provided with a The oil port 18, the oil port 18 and the priority port 14 are not connected on the valve sleeve 10, but the oil port 18 and the priority port 14 are connected to a pipeline at the same time, that is, the two are directly connected on the oil circuit, and the valve The sleeves 10 are spaced apart. The oil passage 18 and the spool cavity 312 communicate with each other, and the oil at the priority port 14 can reach the valve seat cavity 21 through the oil passage 18 and the spool cavity 312, so as to transmit the oil pressure to the end face of the spool 31 to avoid Push the valve core 31 to move.

In one embodiment of the present invention, in order to buffer the oil against the wall surface of the valve core 31 when it flows from the oil supply port 13 to the bypass port 15 , the pressure compensation valve 100 provided by the present invention puts the oil in the oil passage groove 311 of the valve core 31 The part corresponding to the bypass port 15 is set as a curved surface, and the curved surface can be a circular arc surface, a spherical surface or a curved surface with a complex shape, as long as the curved surface can buffer the hydraulic impact of the oil.

The outer wall of the valve core 31 is provided with a plurality of pressure equalizing grooves (not numbered) in the circumferential direction near the bypass port 15. The multiple pressure equalizing grooves are arranged at intervals along the axial direction of the valve sleeve 10. The function of the pressure equalizing grooves is to reduce the The hydraulic clamping phenomenon of the valve core 31 during the movement process ensures the stability and smoothness of the valve core 31 during the movement process.

Please also refer to FIG. 3 . FIG. 3 is an enlarged schematic view of the pressure compensation valve 100 at the position A shown in FIG. 1 .

The valve core assembly 30 includes a fixed seat 32 , and the fixed seat 32 is disposed on the outer side of the valve core 31 and is fixedly connected with the valve core 31 . The fixed seat 32 is supported by one end of the elastic member 40 , so that the elastic force of the elastic member 40 can act on the valve core 31 .

Further, a positioning member 313 is embedded and fixed on the outer side of the valve core 31 , and the positioning member 313 is sleeved with the valve core 31 and embedded on the valve core 31 ; on the positioning member 313 , thereby realizing the mutual fixation between the fixed seat 32 and the valve core 31 .

One end of the elastic member 40 abuts against the fixed seat 32 of the valve core assembly 30, and the other end abuts against the end surface of the first end 10a of the valve sleeve 10. The elastic member 40 is used to provide a pre-tightening force. Driven by the internal oil, when the valve sleeve 10 slides toward the first end 10a of the valve sleeve 10, the movement of the valve core 31 needs to overcome the elastic deformation of the elastic member 40; and when the oil pressure in the sensing oil port 12 drops , the elastic member 40 can drive the valve core 31 to slide toward the second end 10b of the valve sleeve 10 .

Further, in order to prevent the elastic member 40 from directly abutting on the valve sleeve 10 and causing contact wear on the inner wall surface of the valve sleeve 10, the valve sleeve 10 is provided with a gasket 19 on the first end 10a, and the gasket 19 is approximately annular , which sets the part of the valve core 31 extending into the valve seat 20, one end is in contact with the first end 10a of the valve sleeve 10, and the other end is pressed against the first end 10a of the valve sleeve 10 by the resisting action of the elastic member 40 superior.

The arrangement of the gasket 19 avoids the direct contact between the elastic member 40 and the valve sleeve 10, and can avoid problems such as crushing of the contact surface of the valve sleeve 10 caused by excessive elastic pressing force. The replacement cost of the gasket 19 is very low, and the It is beneficial to ensure the reliability and stability of the pressure compensation valve 100 under long-term operation.

FIG. 1 is a working state diagram of the pressure compensation valve 100 when it is in an initial state. The working principle of the pressure compensation valve 100 is briefly explained below based on the above structure.

When the oil supply port 13 of the pressure compensation valve 100 just starts to supply oil, the valve core 31 is at the limit position farthest from the sensing oil port 12 under the elastic action of the elastic member 40, and the oil supply port 13 is connected to the priority port 14 at this time. , and the bypass port 15 is not communicated with the oil passage 311 and the oil supply port 13 due to the sealing action of the valve core 31 . When the oil supply port 13 just starts to supply oil, all the oil flows out of the pressure compensation valve 100 through the priority port 14, which also forms the initial priority oil supply of the pressure compensation valve 100 to the load connected to the priority port 14;

When the oil supply port 13 continues to supply oil to the priority port 14, the oil in the priority port 14 will pass through the oil passage port 18 and along the valve core cavity 312 to reach the valve seat cavity 21, and the oil pressure of the priority port 14 will increase. Push the valve core 31 to move toward the first end 10a of the valve sleeve 10 while compressing the elastic member 40, the elastic deformation of the elastic member 40 provides a reverse elastic force; at this time, the oil in the sensing oil port 12 compensates for the change of the load pressure , that is, the valve core 31 is instantaneously subjected to the positive oil pressure force of the priority port 14, the reverse oil pressure oil force of the sensing oil port 12 and the reverse elastic force of the elastic member 40;

With the further transmission of oil pressure, the communication effect of the relatively long and narrow valve core cavity 312 appears, and the oil pressure in the sensing oil port 12 will be transmitted to the valve seat cavity 21; at this time, the sensing oil port 12, the priority port 14 and the elastic The force provided by the component 40 forms a balanced state; in this state, the oil in the oil supply port 13 all flows to the load connected to the priority port 14, which also forms the continuous pressure compensation valve 100 to the load connected to the priority port 14. Oil supply; so far, the pressure compensation valve 100 forms the oil supply to the priority port 14 in a balanced state.

When the required flow rate of the load group decreases, that is, the oil pressure of the entire load group sensed at the sensing oil port 12 decreases, at this time, the spool 31 will push the spool 31 toward the valve sleeve under the action of the oil pressure of the priority port 14. The first end 10a of 10 moves until the bypass port 15 is opened, and the excess flow flows through the bypass port 15 to the corresponding connected load and drives the load to run; at this time, the compression amount of the elastic member 40 changes and is connected with the priority port 14, The sensing oil port 12 re-establishes a balanced state; so far, the pressure compensation valve 100 forms the oil supply to the priority port 14 and the bypass port 15 in a balanced state.

In the present invention, the induction oil port 12 is provided, and the induction oil port 12 is connected with the load group in the main oil circuit, so the load oil pressure in the main oil circuit can be transmitted to the induction oil circuit 12, and the oil pressure at the priority port 14 can be It gradually changes with the load change; that is, when the load demand changes, the spool 31 will slide with the change of the driving force, thereby changing the effective communication area of the priority port 14 and ensuring that the output oil of the priority port 14 remains constant.

Due to the fluctuation of the load demand, the oil pressure at the sensing oil port 12 and the priority port 14 will fluctuate, and the oil pressure fluctuation will directly cause the spool 31 to be in the response process of frequent actuation, which will not only cause the spool 31 to slip. If it increases greatly and increases to wear, the opening and closing valve performance of the pressure compensating valve 100 will also be greatly reduced, resulting in a great decrease in the reliability and stability of the pressure compensating valve 100 .

In order to reduce the response sensitivity of the pressure compensation valve 100 to load pressure fluctuations and improve the motion stability of the valve core 31 in the valve sleeve 10 , the pressure compensation valve 100 provided by the present invention has a damping hole 50 in the valve core assembly 30 to damp The hole 50 can buffer the driving effect of the oil pressure on the spool assembly 30, so that the reciprocating sliding of the spool assembly 30 under the driving of the oil pressure can be carried out at a relatively gentle speed, which reduces the pressure on the basis of not affecting the opening and closing of the pressure compensation valve 100. The sensitivity of the valve core assembly 30 is improved, thereby improving the reliability and stability of the pressure compensation valve 100 .

In one embodiment of the present invention, the orifice 50 includes a first orifice 51 , the first orifice 51 is opened on the valve core 31 , one end of the first orifice 51 is connected to the sensing oil port 12 , and the other end is connected to the valve The core cavity 312 is connected, and the oil pressure in the sensing oil port 12 reaches the valve seat cavity 21 through the valve core cavity 312. The connection with the valve seat cavity 21 can only be realized after the damping effect of the first damping hole 51. Pass.

The diameter of the first damping hole 51 is smaller than the diameter of the valve core cavity 312 , so the oil will be damped when passing through the first damping hole 51 , and the force amplitude of the oil will weaken under the damping action of the first damping hole 51 . It is relatively smooth, so the oil reaching the valve seat cavity 21 from the sensing oil port 12 is buffered, so the corresponding frequency of the actuation of the valve core 31 is reduced.

In one embodiment of the present invention, the orifice 50 includes a second orifice 52 , one end of the second orifice 52 is communicated with the valve core cavity 312 , the other end is communicated with the oil passage 18 , and the priority port 14 is communicated with the valve seat cavity 21 The interconnection can be achieved only through the oil passage 18 , the second damping hole 52 and the spool cavity 312 . The second damping hole 52 provides a damping effect on the oil at the priority port 14 , buffering the driving frequency of the priority port 14 to the valve core 31 , thereby realizing the buffering effect on the valve core 31 .

In one embodiment of the present invention, the valve core assembly 30 includes a mounting seat 33 , the valve core cavity 312 includes an expansion cavity 3121 communicating with the valve seat cavity 21 and an extension cavity 3122 communicating with the sensing oil port 12 , and the extension cavity 3122 has an opposite extension length. The extension cavity 3121 should have a longer extension length, the extension cavity 3122 is used to provide a circulation channel for oil, and the extension cavity 3121 is used for the mounting seat 33 to be installed and fixed.

The damping hole 50 includes a third damping hole 53 , which is opened on the mounting seat 33 , one end of the third damping hole 53 communicates with the valve seat cavity 21 , and the other end communicates with the extension cavity 3122 , and the third damping hole 53 is used for further The function of buffering the oil flowing into the valve seat cavity 21 from the induction oil port 12 can reduce the driving response of the valve core 31 to the oil.

The third damping hole 53 is opened on the mounting seat 33, so that the mounting seat 33 can be removed from the valve core 31, so that the size of the third damping hole 53 can be replaced with the replacement of the mounting seat 33. The third damping hole 53 The specific size can be replaced by the replacement of the mounting seat 33 according to the flow demand.

Further, the outer side of the mounting seat 33 is provided with an external thread, and the inner side of the expansion cavity 3121 is provided with an inner thread.

It can be understood that in other embodiments, other detachable connection methods such as pin connection, key connection, etc. may also be used between the mounting seat 33 and the valve core 31 .

In the pressure compensation valve 100 provided by the present invention, by opening the damping hole 50 on the valve core assembly 30, the reciprocating sliding of the valve core assembly 30 relative to the valve sleeve 10 is buffered, the response sensitivity of the valve core 31 is appropriately reduced, and the valve core can be avoided. 31 frequently vibrates in the valve sleeve 10, thereby improving its own reliability and stability, and has a wide application prospect.

The pressure compensation valve 100 provided by the present invention, by setting the sensing oil port 12 connected to the external main oil circuit, introduces the load fluctuation into the adjustment process of the valve core 31, thereby reducing the influence of the load pressure fluctuation on the priority flow, thereby improving the accuracy of adjustment properties and has broad application prospects.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

Those skilled in the art should realize that the above embodiments are only used to illustrate the present invention, not to limit the present invention, as long as the above embodiments are appropriately changed within the spirit and scope of the present invention and variations all fall within the scope of the claimed invention.

Claims (10)

1. The pressure compensation valve comprises a valve seat, a valve sleeve, an elastic piece and a valve core assembly, wherein the valve seat is sleeved and fixedly connected with the valve sleeve, a valve seat cavity is formed in the valve seat, the elastic piece is sleeved with the valve core assembly and is contained in the valve seat cavity of the valve seat, the valve core assembly is contained in the valve sleeve, one end of the elastic piece supports against the valve core assembly, and the other end of the elastic piece supports against the valve sleeve, and the pressure compensation valve is characterized in that:

the valve sleeve is provided with an oil supply port, a priority port and a bypass port, one end of the valve sleeve, which is far away from the valve seat, forms an induction oil port, the induction oil port and the priority port are communicated with the valve seat cavity, the induction oil port is communicated with an external main oil way, and the valve core assembly can move in a reciprocating manner relative to the valve sleeve under the oil pressure driving of the priority port and the induction oil port and adjust the circulation state between the oil supply port and the priority port and between the oil supply port and the bypass port.

2. The pressure compensating valve of claim 1, wherein: the valve core assembly comprises a valve core, an oil through groove communicated with the oil supply port is formed in the valve core, and the oil supply port is communicated with the priority port and the bypass port through the oil through groove.

3. The pressure compensating valve as recited in claim 2 wherein: the valve core is provided with a damping hole which is used for buffering the reciprocating sliding of the valve core relative to the valve sleeve.

4. A pressure compensating valve as claimed in claim 3, wherein: the valve core is provided with a valve core cavity which extends along the axial direction and is communicated with the valve seat cavity, the damping hole comprises a first damping hole, and the induction oil port is communicated with the valve seat cavity through the first damping hole.

5. A pressure compensating valve as claimed in claim 3, wherein: an oil through hole is formed in the valve sleeve, the damping hole comprises a second damping hole, and the priority port is communicated with the valve core cavity through the oil through hole and the second damping hole.

6. A pressure compensating valve as claimed in claim 3, wherein: the valve core cavity comprises an expansion cavity communicated with the valve seat cavity and an extension cavity communicated with the induction oil port, the valve core assembly comprises a mounting seat, and the mounting seat is arranged in the extension cavity;

the damping hole comprises a third damping hole, the third damping hole is formed in the mounting seat and communicated with the expansion cavity, and the induction oil port is communicated with the valve seat cavity through the third damping hole.

7. The pressure compensating valve as recited in claim 6 wherein: the installation seat and the valve core are mutually fixed through at least one of threaded connection, key connection and pin connection.

8. The pressure compensating valve as recited in claim 2 wherein: the part of the oil through groove corresponding to the bypass port is set to be a curved surface.

9. The pressure compensating valve of claim 1, wherein: the valve core assembly further comprises a fixed seat, the fixed seat is sleeved and fixed on the valve core, and one end of the fixed seat is abutted by the elastic piece.

10. The pressure compensating valve as recited in claim 9 wherein: a gasket is arranged at one end of the valve sleeve extending into the valve seat, and the gasket is sleeved on the valve core and tightly pressed on the valve sleeve under the propping of the elastic piece; one end of the elastic piece abuts against the fixed seat, and the other end of the elastic piece abuts against the gasket.

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