CN111379756A

CN111379756A - Pressure compensating valve

Info

Publication number: CN111379756A
Application number: CN201811635911.6A
Authority: CN
Inventors: 蔡起涛; 罗占涛; 陶小好
Original assignee: Zhejiang Huayi Precision Machinery Co ltd
Current assignee: Zhejiang Sanshang Zhidi Technology Co ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-07-07

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 compensating valve

Technical Field

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

Background

The pressure compensating valve can provide stable and constant flow for the load communicated with the priority port, oil can be supplied to the bypass port only when the oil supply amount exceeds the load requirement of the priority port, and the priority oil supply characteristic of the pressure compensating valve enables the pressure compensating valve to be widely applied to hydraulic control systems. However, the existing pressure compensation valve cannot eliminate the influence of pressure fluctuation of the whole load in the main oil way on the flow of the priority port, and the actual oil supply amount and the theoretical oil supply amount of the priority port have large fluctuation errors, so that the adjustment accuracy of the pressure compensation valve is reduced.

Disclosure of Invention

In view of the above, there is a need for an improved pressure compensation valve that reduces the effect of load pressure fluctuations on the priority flow rate with high adjustment accuracy.

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, 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;

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 is driven by oil pressure of the priority port and the induction oil port to move back and forth relative to the valve sleeve and adjust the circulation state between the oil supply port and the priority port and between the oil supply port and the bypass port.

Further, 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.

Furthermore, the valve core is provided with a damping hole, and the damping hole is used for buffering the reciprocating sliding of the valve core relative to the valve sleeve.

Furthermore, a valve core cavity which extends along the axial direction and is communicated with the valve seat cavity is formed in the valve core, the damping hole comprises a first damping hole, and the sensing oil port is communicated with the valve seat cavity through the first damping hole.

Furthermore, 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.

Further, 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.

Furthermore, the installation seat and the valve core are mutually fixed through at least one of threaded connection, key connection and pin connection.

Furthermore, the part of the oil through groove corresponding to the bypass port is set to be a curved surface.

Furthermore, 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.

Furthermore, 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 support of the elastic part; one end of the elastic piece abuts against the fixed seat, and the other end of the elastic piece abuts against the gasket.

According to the pressure compensation valve provided by the invention, the sensing oil port communicated with the external main oil way is arranged, and load fluctuation is introduced into the adjusting process of the valve core, so that the influence of the load fluctuation on the priority flow is reduced, the adjusting accuracy is improved, and the pressure compensation valve has a wide application prospect.

Drawings

FIG. 1 is a schematic diagram of a pressure compensating valve according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a valve spool of the pressure compensating valve of FIG. 1;

fig. 3 is an enlarged schematic view of the pressure compensating valve of fig. 1 at a.

Description of the main elements

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

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.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, 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 terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a pressure compensating valve 100 according to an embodiment of the present invention. The present invention provides a pressure compensating valve 100 for providing a stable and constant fluid flow to a target load to provide a suitable drive flow for the operation of the load.

The pressure compensation valve 100 includes a valve housing 10, a valve seat 20, a valve core assembly 30 and an elastic member 40, wherein the valve seat 20 is sleeved on one end of the valve housing 10 and is fixedly connected with the valve housing 10, the valve core assembly 30 is accommodated in the valve housing 10, the elastic member 40 is sleeved on one end of the valve housing 10 extending into the valve seat 20 and is accommodated in the valve seat 20, one end of the elastic member 40 abuts against the valve core assembly 30, and the other end abuts against the valve housing 10. The valve housing 10 is used for accommodating the valve core assembly 30, the valve seat 20 is used for fixing the valve housing 10, the valve core assembly 30 is used for controlling the opening degree of the pressure compensating valve 100, and the elastic member 40 is used for providing pre-tightening force so as to adjust the balance state of the valve core assembly 30.

Under the supporting action 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 the position of the valve core assembly relative to the valve sleeve 10 under the driving of the oil pressure, so as to adjust the valve opening degree of the pressure compensation valve 100, further adjust the oil inlet amount of a load connected with the pressure compensation valve 100 and control the running state of the load.

Specifically, the valve housing 10 is substantially hollow and cylindrical, and has a hollow interior and a housing cavity 11 for sliding the valve core assembly 30, and the valve housing 10 has two ends, namely a first end 10a and a second end 10b opposite to the first end 10 a. The first end 10a of the valve housing 10 is mounted on the valve seat 20 so that the valve housing 10 is fixedly coupled to the valve seat 20.

Further, the first end 10a of the valve sleeve 10 is sleeved on the valve seat 20, the outer side surface of the first end 10a of the valve sleeve 10 is in threaded connection with the inner side surface of the valve seat 20, and the valve sleeve 10 is in threaded connection with the valve seat 20 to realize fixed connection between the valve sleeve 10 and the valve seat 20.

It will be appreciated that in other embodiments, the valve sleeve 10 and the valve seat 20 may be secured to each other by other removable connections such as a keyed connection, a pinned connection, etc.

The second end 10b of the valve housing 10 forms a sensing port 12, the sensing port 12 is communicated with the valve housing cavity 11, and the oil pressure at the sensing port 12 is equal to the oil pressure required by the load, which can sense the oil pressure required by the load and drive the valve core assembly 30 to move.

Further, an oil supply port 13, a priority port 14 and a bypass port 15 are formed in the cylindrical wall of the valve housing 10, the oil supply port 13, the priority port 14 and the bypass port 15 are all connected to the valve housing cavity 11 of the valve housing 10, and the oil supply port 13 is located between the priority port 14 and the bypass port 15. The oil supply port 13 is used for supplying hydraulic oil into the pressure compensating valve 100, the priority port 14 and the bypass port 15 are both connected with a load, and when the oil supply port 13 is communicated with the priority port 14 or the bypass port 15, the load correspondingly connected with the priority port 14 or the bypass port 15 operates under the oil supply of the oil supply port 13, so that the working process of distributing the oil through the pressure compensating valve 100 and controlling different operating states of the load is realized.

Further, the load communicating with the priority port 14 is superior in operation priority to the load communicating with the bypass port 15, and the pressure compensating valve 100 preferentially supplies the oil to the load communicating with the priority port 14 when distributing the oil, ensuring full-power operation of the load communicating with the priority port 14. Only when the oil demand of the load communicating with the priority port 14 has been satisfied by the supply of the oil supply port 13 is the surplus oil supplied to the load communicating with the bypass port 15, i.e. the pressure compensating valve 100 supplies the oil to the bypass port 15 only on the basis of the demand of the priority port 14 having been satisfied.

It is understood that the number of the oil supply port 13, the priority port 14, and the bypass port 15 may be one or more. In the present embodiment, the number of the oil supply ports 13, the priority ports 14, and the bypass ports 15 is plural, and the plural oil supply ports 13 are distributed one by one in the circumferential direction of the valve housing 10 and are distributed in a central symmetry manner with the central axis of the valve housing 10 as an axis; similarly, the plurality of priority ports 14 are spaced one by one along the circumferential direction of the valve housing 10 and are arranged in a central symmetrical manner with the central axis of the valve housing 10 as an axis, and the plurality of bypass ports 15 are also spaced one by one along the circumferential direction of the valve housing 10 and are arranged in a central symmetrical manner with the central axis of the valve housing 10 as an axis.

Further, a plurality of mounting grooves (not numbered) are formed in the outer wall of the valve housing 10 along the circumferential direction, a sealing member 16 and a retainer ring 17 are mounted in each mounting groove, the plurality of sealing members 16 are sleeved on the circumferential wall of the valve housing 10 and are arranged at intervals along the central axis direction of the valve housing 10, and the sealing members 16 are used for sealing the pressure compensating valve 100 and an external hydraulic component; the retainer ring 17 fits over the seal 16, and the retainer ring 17 abuts and holds the seal 16, thereby restricting axial movement of the seal 16.

In the present embodiment, the seal 16 is an O-ring seal. It is understood that in other embodiments, the seal 16 may be other types of seals such as V-rings, packing, etc.

The valve seat 20 is substantially cylindrical, a valve seat cavity 21 extending along the axial direction of the valve seat is formed in the valve seat 20, the valve seat cavity 21 only penetrates through one end face of the valve seat 20, the valve sleeve 10 is sleeved on the valve seat 20 and is fixed with the valve sleeve 10 in a threaded manner, and the valve seat 20 is used for installing the valve sleeve 10.

The outer side of the valve seat 20 is also provided with a number of seals (not shown) for sealing the valve seat 20 with the external hydraulic system.

Referring to fig. 2, fig. 2 is a schematic structural diagram of the valve element 31 of the pressure compensating valve 100 shown in fig. 1.

The valve core assembly 30 includes a valve core 31, the valve core 31 is generally in the shape of a multi-section cylinder, and the valve core 31 is accommodated in the housing cavity 11 of the housing 10 and can slide back and forth in the housing 10. The outer side surface of the valve body 31 is recessed in the radial direction and forms an oil through groove 311, and the oil through groove 311 extends substantially in a direction parallel to the axial direction of the valve body 31, and allows the valve body 31 to be reduced in size in part of the axial section. The oil-through groove 311 communicates with the oil supply port 13; when the spool 31 reaches a position where the oil passage groove 311 is completely communicated with the priority port 14, the bypass port 15 is not communicated with the oil passage groove 311 at this time. That is, the spool 31 has a first position, and the oil passage groove 311 of the spool 31 in the first position communicates with the priority port 14 and does not communicate with the bypass port 15.

After the valve core 31 moves a certain distance in the direction of the sensing port 12 of the valve housing 10, the position of the oil through groove 311 changes along with the movement of the valve core 31, the oil through groove 311 continues to communicate with the oil supply port 13, the oil through groove 311 also continues to communicate with the bypass port 15 along with the movement of the valve core 31, and at this time, the oil through groove 311 continues to communicate with the priority port 14. That is, the valve body 31 has the second position, and the oil passage groove 311 of the valve body 31 in the second position communicates with the priority port 14 and also communicates with the bypass port 15.

A valve core cavity 312 is formed in 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 communicated with the sensing oil port 12, and the other end is communicated with the valve seat cavity 21. The spool chamber 312 is used for guiding the oil in the sensing port 12 to the valve seat chamber 21, so that the sensing port 12 can push the spool 31 to slide in a direction close to the sensing port 12 (downward in the direction shown in fig. 1).

In the same principle, in order to achieve the 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 circumferential wall of the valve housing 10 is provided with the oil through port 18, the oil through port 18 and the priority port 14 are not communicated on the valve housing 10, but the oil through port 18 and the priority port 14 are simultaneously communicated with one pipeline, that is, the two are directly connected on the oil path and are spaced on the valve housing 10. The oil through port 18 and the spool chamber 312 are communicated with each other, and the oil at the priority port 14 can reach the valve seat chamber 21 through the oil through port 18 and the spool chamber 312, so that the oil pressure is transmitted to the end face of the spool 31 to push the spool 31 to move.

In one embodiment of the present invention, in order to buffer the impact of the oil flowing from the oil supply port 13 to the bypass port 15 on the wall surface of the valve body 31, the pressure compensating valve 100 of the present invention may be configured such that the portion of the oil flowing groove 311 of the valve body 31 corresponding to the bypass port 15 is a curved surface, which may be an arc surface, a spherical surface, or a curved surface having a complex shape, as long as the curved surface can buffer the hydrodynamic impact of the oil.

The outer wall of the valve core 31 is provided with a plurality of pressure equalizing grooves (not numbered) along the circumferential direction at the position close to the bypass port 15, the pressure equalizing grooves are arranged at intervals along the axial direction of the valve sleeve 10, and the pressure equalizing grooves are used for reducing the hydraulic clamping phenomenon of the valve core 31 in the moving process, so that the stability and the smoothness of the valve core 31 in the moving process are ensured.

Referring also to fig. 3, fig. 3 is an enlarged schematic view of the pressure compensating valve 100 of fig. 1 at a.

The valve core assembly 30 comprises a fixed seat 32, and the fixed seat 32 is arranged on the outer side surface of the valve core 31 and is fixedly connected with the valve core 31. The fixed seat 32 is abutted 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.

Furthermore, a positioning element 313 is embedded and fixed on the outer side surface of the valve core 31, and the positioning element 313 is sleeved on the valve core 31 and embedded on the valve core 31; the fixed seat 32 is clamped on the positioning part 313 under the abutting action of the elastic part 40, so that the fixed seat 32 and the valve core 31 are fixed with each other.

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 housing 10, the elastic member 40 is used for providing a pre-tightening force, and when the valve core 31 slides towards the first end 10a of the valve housing 10 in the valve housing 10 under the driving of the oil in the sensing oil port 12, the movement of the valve core 31 needs to overcome the elastic deformation of the elastic member 40; and when the pressure of the oil in the sensing port 12 is lowered, the elastic member 40 may drive the valve core 31 to slide toward the second end 10b of the valve housing 10.

Further, in order to avoid the elastic member 40 directly abutting against the valve housing 10 and causing contact abrasion of the inner wall surface of the valve housing 10, the valve housing 10 is provided with a gasket 19 at the first end 10a, the gasket 19 is substantially annular, and has a portion where the valve element 31 extends into the valve seat 20, one end of the gasket is in contact with the first end 10a of the valve housing 10, and the other end of the gasket is pressed against the first end 10a of the valve housing 10 by the abutting action of the elastic member 40.

The gasket 19 is arranged to avoid direct contact between the elastic member 40 and the valve housing 10, so as to avoid the problem of the valve housing 10 that the contact surface is crushed due to an excessive elastic pressing force, and the like, and the replacement cost of the gasket 19 is low, which is also beneficial to ensuring the reliability and stability of the pressure compensating valve 100 in long-term operation.

Fig. 1 is a diagram illustrating an operation state of the pressure compensating valve 100 in an initial state, and the operation principle of the pressure compensating valve 100 will be briefly explained based on the above-described structure.

When the oil supply port 13 of the pressure compensating valve 100 starts to supply oil, the valve core 31 is at the limit position farthest from the sensing oil port 12 by the elasticity of the elastic member 40, and the oil supply port 13 is communicated with the priority port 14, while the bypass port 15 is not communicated with the oil through groove 311 and the oil supply port 13 by the sealing action of the valve core 31. When the oil supply port 13 starts to supply oil, all the oil flows out of the pressure compensating valve 100 through the priority port 14, so that the pressure compensating valve 100 forms initial priority oil supply to the load communicated with 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 passes through the oil passage port 18 and reaches the valve seat chamber 21 along the valve core chamber 312, the oil pressure of the priority port 14 pushes the valve core 31 to move towards the first end 10a of the valve sleeve 10 and compress the elastic member 40, and the elastic deformation of the elastic member 40 provides a reverse elastic acting force; at this time, the oil in the sensing port 12 compensates for the change of the load pressure, that is, the valve core 31 is instantaneously subjected to the forward oil pressure acting force of the priority port 14, the reverse oil pressure acting force of the sensing port 12 and the reverse elastic acting force of the elastic member 40;

along with the further transmission of the oil pressure, the communication function of the relatively long and narrow valve core cavity 312 is displayed, and the oil pressure in the sensing oil port 12 is transmitted into the valve seat cavity 21; at this time, the acting forces provided by the sensing oil port 12, the priority port 14 and the elastic member 40 form a balanced state; in this state, all the oil in the oil supply port 13 flows to the load connected to the priority port 14, and thus the pressure compensating valve 100 continues to supply oil to the load connected to the priority port 14; to this end, the pressure compensating valve 100 forms an oil supply to the priority port 14 in a balanced state of load.

When the flow rate required by the load group is reduced, that is, the oil pressure of the entire load group sensed at the sensing oil port 12 is reduced, at this time, the valve core 31 pushes the valve core 31 to move toward the first end 10a of the valve housing 10 under the oil pressure of the priority port 14 until the bypass port 15 is opened, and the redundant flow rate flows to the correspondingly communicated load through the bypass port 15 and drives the load to operate; at this time, the compression amount of the elastic element 40 changes and re-forms a balance state with the priority port 14 and the sensing port 12; to this end, the pressure compensating valve 100 forms an oil supply to the priority port 14 and the bypass port 15 in a balanced state.

According to the invention, the sensing oil port 12 is arranged, and the sensing oil port 12 is connected with the load group in the main oil way, so that the load oil pressure in the main oil way can be transmitted to the sensing oil way 12, and the oil pressure at the priority port 14 can gradually change along with the change of the load; that is, when the load demand changes, the spool 31 slides with the change of the driving force, so that the effective communication area of the priority port 14 is changed, and the output oil of the priority port 14 is ensured to be kept constant.

Because the fluctuation of the demand of the load may cause the oil pressure fluctuation at the sensing port 12 and the priority port 14, the fluctuation of the oil pressure may directly cause the valve core 31 to be in the response process of frequent actuation, which not only causes the great increase of the slippage of the valve core 31 and the increase of the abrasion, but also causes the great reduction of the performance of the opening and closing valve of the pressure compensating valve 100, which causes the great reduction of the reliability and the stability of the pressure compensating valve 100.

In order to reduce the response sensitivity of the pressure compensating valve 100 to load pressure fluctuation and improve the motion stability of the valve core 31 in the valve sleeve 10, the pressure compensating valve 100 provided by the invention is provided with the damping hole 50 in the valve core assembly 30, and the damping hole 50 can buffer the driving action of oil pressure on the valve core assembly 30, so that the reciprocating sliding of the valve core assembly 30 under the driving of the oil pressure can be performed at a relatively gentle speed, the sensitivity of the valve core assembly 30 is reduced on the basis of not influencing the opening and closing of the pressure compensating valve 100, and the reliability and the stability of the pressure compensating valve 100 are improved.

In an embodiment of the present invention, the damping hole 50 includes a first damping hole 51, the first damping hole 51 is opened on the spool 31, one end of the first damping hole 51 is connected to the sensing port 12, and the other end is communicated with the spool cavity 312, and the communication with the valve seat cavity 21 can be achieved only after the damping action of the first damping hole 51 when the oil pressure in the sensing port 12 reaches the valve seat cavity 21 through the spool cavity 312.

The aperture of the first damping hole 51 is smaller than that of the valve core cavity 312, so that the oil can be damped when passing through the first damping hole 51, the amplitude of the acting force of the oil is weakened and relatively gentle under the damping action of the first damping hole 51, the oil reaching the valve seat cavity 21 from the sensing oil port 12 is buffered, and the corresponding frequency 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 communicates with the spool chamber 312, and the other end communicates with the oil through port 18, and the communication between the priority port 14 and the seat chamber 21 is achieved through the oil through port 18, the second orifice 52, and the spool chamber 312. The second orifice 52 provides a damping effect on the oil at the priority port 14, and damps the driving frequency of the valve element 31 from the priority port 14, thereby achieving a damping effect on the valve element 31.

In one embodiment of the invention, the spool assembly 30 comprises the mounting seat 33, the spool cavity 312 comprises an extended cavity 3121 communicated with the valve seat cavity 21 and an extended cavity 3122 communicated with the sensing oil port 12, the extended length of the extended cavity 3122 is longer than that of the extended cavity 3121, the extended cavity 3122 is used for providing a flow passage of oil, and the extended cavity 3121 is used for mounting and fixing the mounting seat 33.

The damping hole 50 comprises a third damping hole 53, the third damping hole 53 is opened in the mounting seat 33, one end of the third damping hole 53 is communicated with the valve seat cavity 21, the other end of the third damping hole is communicated with the extension cavity 3122, and the third damping hole 53 is used for further buffering oil flowing into the valve seat cavity 21 from the sensing oil port 12, so that the driving of the valve core 31 to the oil can be reduced.

The third damping hole 53 is formed in the mounting seat 33, so that the mounting seat 33 can be detached from the valve core 31, the size of the third damping hole 53 can be changed along with the change of the mounting seat 33, and the specific size of the third damping hole 53 can be changed through the change of the mounting seat 33 according to the flow demand.

Further, the outer side surface of the mounting seat 33 is provided with an external thread, the inner side surface of the expansion cavity 3121 is provided with an internal thread, and the mounting seat 33 is screwed and installed in the expansion cavity 3121, so that the detachable connection with the valve core 31 is realized.

It will be appreciated that in other embodiments, other detachable connections such as a pin connection, a key connection, etc. may be used between the mounting seat 33 and the valve core 31.

According to the pressure compensation valve 100 provided by the invention, the damping hole 50 is formed in the valve core assembly 30, so that 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 properly reduced, the frequent shaking of the valve core 31 in the valve sleeve 10 can be avoided, the reliability and the stability of the pressure compensation valve are improved, and the pressure compensation valve 100 has a wide application prospect.

According to the pressure compensation valve 100 provided by the invention, the sensing oil port 12 communicated with the external main oil way is arranged, and load fluctuation is introduced into the adjusting process of the valve core 31, so that the influence of the load fluctuation on the priority flow is reduced, the adjusting accuracy is improved, and the pressure compensation valve has a wide application prospect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.

Claims

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;

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.