CN212899199U - Buffer overflow valve - Google Patents

Abstract

The utility model relates to a buffer overflow valve, which comprises a valve body component and a valve core component, wherein the valve body component is provided with a valve cavity, a valve port communicated with the valve cavity and an oil outlet, the valve core component is arranged in the valve cavity and can control the circulation state between the valve port and the oil outlet, the valve core component comprises a buffer valve core, a first valve core and an elastic element, the elastic element is arranged between the first valve core and the buffer valve core, and the first valve core is arranged on one side relatively close to the valve port; the buffer valve core is slidably mounted in the valve cavity and relatively far away from one side of the valve port, the buffer valve core is provided with a buffer cavity and at least two damping holes which are arranged in parallel, and the valve port is respectively communicated with the buffer cavity through the at least two damping holes. According to the buffer overflow valve, the plurality of damping holes which are connected in parallel are arranged, so that new hydraulic balance can be established for the hydraulic oil pressure in the buffer overflow valve through the plurality of damping holes which are connected in parallel, the problem that the load of a hydraulic motor is heavy is solved, and the hydraulic motor can stably run.

Description

Buffer overflow valve

Technical Field

The utility model relates to the technical field of valves, especially, relate to a buffering formula overflow valve.

Background

The buffer overflow valve is widely applied to the hydraulic motor. The buffer overflow valve mainly plays a role in constant-pressure overflow in the hydraulic motor, and can buffer the suddenly-raised hydraulic pressure in the hydraulic equipment so as to prevent the hydraulic equipment from being damaged by sudden pressure change in the operation process.

However, when the load of the hydraulic motor is heavy, the existing buffering overflow valve structure is easy to cause pressure imbalance, and further causes the problems that the hydraulic motor is unstable in operation and even has operation faults.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide an improved buffer relief valve. According to the buffer overflow valve, the plurality of damping holes which are connected in parallel are arranged, so that new hydraulic balance can be quickly established by the hydraulic oil pressure in the buffer overflow valve through the plurality of damping holes which are connected in parallel, the problem that the load of a hydraulic motor is heavy is quickly responded, and the hydraulic motor can stably run.

A buffer overflow valve comprises a valve body assembly and a valve core assembly, wherein the valve body assembly is provided with a valve cavity, a valve port and an oil outlet, the valve port and the oil outlet are communicated with the valve cavity, the valve core assembly is arranged in the valve cavity and can control the flow state between the valve port and the oil outlet, the valve core assembly comprises a buffer valve core, a first valve core and an elastic element, the elastic element is arranged between the first valve core and the buffer valve core, and the first valve core is arranged on one side which is relatively close to the valve port;

the buffer valve core is slidably mounted in the valve cavity and is relatively far away from one side of the valve port, the buffer valve core is provided with a buffer cavity and at least two damping holes which are arranged in parallel, and the valve port is respectively communicated with the buffer cavity through the at least two damping holes.

Furthermore, the first valve core is movably sleeved on the buffer valve core, a damping flow channel communicated with the valve cavity is formed in the first valve core, and the damping flow channel is respectively communicated with the buffer cavity through a damping hole of the buffer valve core.

Furthermore, the damping hole of the buffer valve core comprises a first damping hole, and the first damping hole, the damping flow channel and the valve port are coaxially arranged.

Furthermore, the damping hole of the buffer valve core comprises a second damping hole, an annular groove communicated with the damping flow channel and the buffer cavity is formed in the peripheral wall of the buffer valve core, a damping portion is annularly arranged on the peripheral wall of the buffer valve core and located in the annular groove, and the second damping hole is formed between the damping portion and the first valve core.

Furthermore, a communicating hole is formed in the buffer valve core and comprises a first through hole and a second through hole, and the first through hole is communicated with the damping flow channel and the annular groove; the second through hole is communicated with the buffer cavity and the annular groove.

Further, the center axis of the communication hole is perpendicular to the center axis of the first orifice.

Furthermore, a guide port communicated with the damping flow channel is formed in one side, facing the first valve core, of the buffer valve core, and the guide port is communicated with the first damping hole and the second damping hole respectively.

Furthermore, the first valve core is provided with a buffer chamber communicated with the damping flow channel, the buffer valve core is inserted into the buffer chamber, and the buffer chamber is communicated with the buffer cavity through the first damping hole and the second damping hole respectively.

Further, the valve body assembly comprises a valve body and a valve seat, the valve body is provided with the valve port, the valve seat is arranged in the valve port and is correspondingly provided with an oil inlet communicated with the valve port, the first valve core abuts against the inner wall of the oil inlet, and the valve body and the valve seat are connected with each other through clearance fit.

Furthermore, one end, relatively close to the first valve core, of the valve seat extends along the radial direction of the valve seat and forms an annular convex part, the outer diameter of the annular convex part is larger than the inner diameter of the valve port, and the annular convex part abuts against the valve seat.

The utility model provides a buffering formula overflow valve is through setting up a plurality of parallelly connected damping holes for hydraulic oil pressure in the buffering formula overflow valve can establish new hydraulic pressure balance through the damping hole of a plurality of parallelly connected settings fast, thereby not only respond the heavier problem of hydraulic motor load rapidly, thereby makes hydraulic motor can the steady operation.

Drawings

Fig. 1 is a schematic cross-sectional view of a buffer overflow valve according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the buffer relief valve of FIG. 1 at A;

fig. 3 is a schematic structural diagram of a relief valve spool in the relief valve shown in fig. 1.

Description of the element reference numerals

100. A buffer overflow valve; 10. a valve body assembly; 11. a valve body; 111. a valve cavity; 112. a limiting part; 113. an oil outlet; 114. a positioning part; 12. a valve seat; 121. an oil inlet; 122. a limiting groove; 123. an annular protrusion; 20. a valve core assembly; 21. a buffer valve core; 211. a buffer chamber; 212. a first orifice; 213. an annular groove; 214. a damping part; 215. a second orifice; 216. a communicating hole; 2161. a first through hole; 2162. a second through hole; 217. a guide port; 218. abutting against the boss; 219. a seal ring; 22. a first valve spool; 221. a drainage opening; 222. a damping flow channel; 223. a buffer chamber; 23. an elastic member.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

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 herein in the description of the invention 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 cross-sectional view of a buffer overflow valve 100 according to an embodiment of the present invention.

The utility model provides a buffering formula overflow valve 100, this buffering formula overflow valve 100 mainly are applied to hydraulic motor. The relief valve 100 is used to protect the hydraulic motor from overload to prevent sudden hydraulic changes from damaging the hydraulic motor.

The buffer relief valve 100 includes a valve body assembly 10 and a valve core assembly 20. The valve core assembly 20 is slidably installed in the valve body assembly 10, the valve body assembly 10 has a valve cavity 111 and a valve port (not numbered) communicated with the valve cavity 111, and the valve core assembly 20 is installed in the valve cavity 111 and can control the flow state of the valve port. The valve body assembly 10 is used for accommodating the valve core assembly 20; the valve core assembly 20 is used for controlling the flow state of the valve port.

The valve body assembly 10 includes a valve body 11 and a valve seat 12. The valve seat 12 is mounted on the valve body 11, and the valve seat and the valve body are used for cooperating with the valve core assembly 20 to control the flow state of the relief valve 100. The valve body 11 has a substantially cylindrical shape, and the valve body 11 has a complicated outer contour to accommodate a mounting space of the relief valve 100 in the hydraulic motor. The valve body 11 is provided with a valve cavity 111 and a valve port for communicating the valve cavity 111 with the outside along the direction of the central axis of the valve body 11. The valve cavity 111 is used for accommodating the valve core assembly 20, and the valve port is used for being connected with the valve seat 12 and correspondingly forming a valve inlet passage for hydraulic oil. The valve seat 12 is installed in a valve port of the valve seat 12, and an oil inlet 121 communicated with the valve port is correspondingly formed. When the buffer overflow valve 100 is in a closed state, the valve core assembly 20 is slidably mounted in the valve cavity 111 and abuts against the inner wall of the oil inlet 121 of the valve seat 12; when the buffer relief valve 100 is in an open state, the valve core assembly 20 slides towards a direction away from the oil inlet 121, and hydraulic oil is made to enter the valve cavity 111 through the oil inlet 121.

It can be understood that, in other embodiments, the shapes of the valve body 11 and the valve seat 12 may be set according to actual requirements, as long as the valve body and the valve seat can accommodate the valve core assembly 20 and cooperate with the valve core assembly 20 to control the flow state.

In the present embodiment, in order to accurately position the valve body assembly 20 on the valve seat 12, the valve body 11 and the valve seat 12 are connected by clearance fit, unlike the conventional caulking fixation between the valve body 11 and the valve seat 12. It should be explained that the clearance between the valve seat 12 and the valve seat 12 is not sufficient to allow a significant change in position between the two; it means that the valve seat 12 can move only in a slight range in the axial or radial direction of the valve body 11. When the valve core assembly 20 abuts against the valve seat 12, the valve seat 12 can correspondingly change in position with the valve body 11 according to the actual abutting position of the valve core assembly 20, and the valve seat 12 can be more attached to the valve core assembly 20, so that the sealing position between the valve seat 12 and the valve core assembly 20 is more accurate.

By the arrangement, the leakage amount of the buffer overflow valve 100 can be correspondingly reduced; meanwhile, the requirement on the machining precision of the valve seat 12 can be correspondingly reduced, the valve seat 12 and the valve body 11 cannot be loosened due to clearance fit, and the valve seat is convenient to carry, disassemble, assemble and separate. Furthermore, the energy consumption of the hydraulic motor can be reduced accordingly.

It is understood that, in other embodiments, if the fitting accuracy with the valve core assembly 20 is not considered, the valve body 11 and the valve seat 12 may be connected by welding, fixing riveting, or the like, as long as the fitting with the valve core assembly 20 and the control of the flow state are achieved.

Specifically, one end of the valve seat 12 is inserted into the valve port. The outer peripheral wall of the valve seat 12 is provided with a limiting groove 122; the inner wall of the valve port of the valve body 11 is provided with a limit part 112 protruding towards the valve seat 12. The position-limiting portion 112 is embedded in the position-limiting groove 122, and forms an installation gap (not numbered) with the inner wall of the position-limiting groove 122. The limiting part 112 is matched with the limiting groove 122 and positions the relative position of the valve body 11 and the valve seat 12; the mounting clearance is used to provide a clearance fit between the valve body 11 and the valve seat 12. So set up for the connection structure between valve seat 12 and the valve body 11 is simple relatively, is convenient for processing and equipment.

It is understood that, in other embodiments, the positions of the limiting groove 122 and the limiting portion 112 may be interchanged, that is, the limiting groove 122 is opened on the valve body 11, and the limiting portion 112 is disposed on the valve seat 12, as long as the clearance fit between the valve body 11 and the valve seat 12 can be achieved.

In one embodiment, one end of the valve seat 12, which is relatively close to the valve core assembly 20, extends along the radial direction of the valve seat 12 and forms an annular protrusion 123, and the outer diameter of the annular protrusion 123 is larger than the inner diameter of the valve port formed by the limiting part 112. When the valve seat is installed, the annular convex part 123 of the valve seat 12 is pressed into the valve cavity through external force, the valve seat 12 extends into the valve cavity 111 along the axial direction of the valve body 11, and the limiting part 112 of the valve body 11 is embedded into the limiting groove 122; meanwhile, because the valve seat 12 is still in the toughness range, the annular protrusion 123 can be relatively sprung open and abut against the end surface of the limiting portion 112 after completely entering the valve cavity 111, and the limiting between the valve seat 12 and the valve body 11 is realized.

It is understood that, in other embodiments, if the connection stability between the valve body 11 and the valve seat 12 is not considered, the annular protrusion 123 may be correspondingly configured as a convex point and cooperate with the correspondingly configured limiting groove 122, as long as the relative connection between the valve body 11 and the valve seat 12 can be realized and a clearance fit is formed.

In one embodiment, the annular protrusion 123 is provided with a chamfer on a side facing the stopper 112 to reduce a contact area between the press-in end of the valve seat 12 and facilitate smooth press-in of the valve seat 12 into the valve body 11 via the annular protrusion 123. It will be appreciated that in other embodiments, the annular protrusion 123 may also be provided as a beveled chamfer, as long as the valve seat 12 is achieved for ease of introduction into the valve cavity 111 of the valve body 11.

Of course, the side wall of the valve body 11 is provided with an oil outlet 113. The oil outlet 113 is communicated with the valve cavity 111; the oil outlet 113 is used for allowing hydraulic oil to flow out of the valve cavity 111, and forms a complete hydraulic oil flow passage with the oil inlet 121 and the valve cavity 111. Preferably, the oil outlet 113 is opened at a position relatively close to the stopper portion 112.

Referring to fig. 2 and 3 together, fig. 2 is an enlarged schematic view of the relief valve 100 shown in fig. 1 at a point a; fig. 3 is a schematic diagram of the structure of the relief valve body 21 of the relief valve 100 shown in fig. 1.

The spool assembly 20 includes a trim spool 21 and a first spool 22. The first valve core 22 and the buffer valve core 21 are sequentially installed along the central axis of the valve body 11; the first valve core 22 is movably sleeved at one end of the buffer valve core 21, and the first valve core 22 is installed at one side opposite to the oil inlet 121 and can be abutted against the inner wall of the oil inlet 121; the damper spool 21 is installed on a side relatively far from the oil inlet 121. The first valve core 22 is used for matching with the oil inlet 121 and controlling the circulation state of the oil inlet 121; the damper spool 21 serves to reduce the high pressure of the hydraulic oil in the valve chamber 111. The first spool 22 and the damper spool 21 are capable of sliding in the valve chamber 111 simultaneously and opening the oil inlet 121, and the damper spool 21 is also capable of sliding relative to the first spool 22 under the action of hydraulic oil pressure.

In one embodiment, an elastic member 23 is provided between the damper spool 21 and the first spool 22. One end of the elastic element 23 is abutted against the first valve core 22, the other end is abutted against the buffer valve core 21, and the elastic element 23 is always in a compressed state. The elastic member 23 is used to make the first spool 22 and the damper spool 21 slidable relative to the valve body 11 and make the first spool 22 abut against the inner wall of the oil inlet 121. When the pressure of the oil inlet 121 is greater than the pressure of the oil outlet 113, the hydraulic oil moves the first valve spool 22 and the relief valve spool 21 in the axial direction of the valve body 11 by overcoming the elastic force of the elastic member 23, and opens the relief valve 100.

In the present embodiment, the elastic member 23 is a compression spring. By the arrangement, the processing and production cost of the buffer overflow valve 100 is low. It is understood that, in other embodiments, the elastic element 23 may also be provided with other structures, such as an elastic sheet, as long as the first valve core 22 can be abutted against the inner wall of the oil inlet 121 and can be pushed away.

The first spool 22 is substantially cylindrical. The first valve core 22 is provided with a drainage port 221 and a damping flow passage 222 which are communicated with each other along the central axis of the first valve core 22; one side of the first valve core 22 facing the oil inlet 121 is opened with a conical abutting portion. The drainage port 221 is used for guiding hydraulic oil to enter the damping flow channel 222; the damping flow passage 222 is used for communicating the valve cavity 111 and the cavity of the damper valve core 21 and plays a role of buffering high-pressure hydraulic oil in the valve cavity 111. The abutting part is used for abutting against the inner wall of the oil inlet 121 and can form a flow channel of hydraulic oil with the inner wall of the oil inlet 121. It is understood that in other embodiments, the vents 221 may be omitted accordingly.

In one embodiment, the first spool 22 opens with a damper chamber 223 in the direction of the center axis toward one end of the damper spool 21. The damper chamber 223 is configured to fit the damper spool 21 and forms a damper space having a damper function with the damper spool 21. The damping chamber 223 communicates with the damping flow passage 222, so that the damping chamber 223 between the first spool 22 and the damper spool 21 can perform a first-stage damping action, and accordingly, a damping space of the spool assembly 20 can be enlarged.

In order to further enhance the cushion function of the cushion relief valve 100, the cushion valve body 21 is substantially cylindrical, and the cushion valve body 21 is provided with a cushion chamber 211 and a first orifice 212 in this order along the central axis, and the cushion chamber 211 communicates with the cushion chamber 223 through the first orifice 212. The buffer cavity 211 is used for allowing high-pressure hydraulic oil to enter and is matched with the buffer valve core 21 to play a role in balancing the high-pressure hydraulic oil in the buffer overflow valve 100; the first damping hole 212 can damp the pressure of the high-pressure hydraulic oil in the damping chamber 223 and perform a secondary damping function.

In the present embodiment, by providing the two-stage relief chamber 223 and the relief chamber 211 between the first spool 22 and the relief valve spool 21, the volume of the relief chamber 211 can be optimized accordingly, and the relief time for opening or closing the relief valve 100 can be further stabilized.

When the pressure of the hydraulic oil overcomes the elastic force of the elastic element 23 to open the first valve core 22, the hydraulic oil enters the valve cavity 111 through the oil inlet 121 and can flow out of the oil outlet 113; at this time, a part of the hydraulic oil in the valve chamber 111 flows into the buffer chamber 223 through the damping flow passage 222, and further enters the buffer chamber 211 through the first damping hole 212; when the hydraulic oil in the buffer chamber 223 and the buffer cavity 211 is slowly filled, the hydraulic oil in the buffer cavity 211 pushes the buffer valve core 21 and the first valve core 22 towards the oil inlet 121 and closes the oil inlet 121 again; when the first valve core 22 needs to be opened again, the hydraulic oil pressure of the oil inlet 121 and the elastic force of the spring at the time can push the first valve core 22 away from the inner wall of the oil inlet 121 again, and at the time, the preset pressure of the buffer overflow valve 100 is the same.

It is understood that, in other embodiments, if the first spool 22 is omitted, the first damping hole 212 directly communicates with the valve chamber 111 as long as it can function to correspondingly buffer the high-pressure hydraulic oil.

It should be noted that, the inner wall of the installation cavity of the first valve core 22 and the outer peripheral wall of the buffer valve core 21 are in sealed connection, so that hydraulic oil cannot enter the cavity where the elastic element 23 is located through a gap between the two.

In the present embodiment, the first spool 22 and the damper spool 21 are provided separately. It will be appreciated that in other embodiments, the first spool 22 and the trim spool 21 may be integrally formed, regardless of the difficulty of the process.

When the load of the hydraulic motor is heavy, the conventional buffer overflow valve structure still has the possibility of pressure imbalance, and further causes the problems of unstable operation, even operation failure and the like of the hydraulic motor. In order to alleviate the above problems, at least two damping holes arranged in parallel are formed in the buffer valve core 21, so that hydraulic oil can rapidly reach the purpose of hydraulic balance through the two damping holes, and the operation stability of the hydraulic motor can be ensured.

It should be explained that, in the embodiment, the parallel arrangement means that the hydraulic oil in the buffer chamber 223 can reach the buffer cavity 211 through any one or more damping holes.

Wherein, the at least two damping holes include a first damping hole 212.

In one embodiment, as shown in fig. 2 and 3, an annular groove 213 is formed in the outer periphery of the damper valve body 21. The middle position of the annular groove 213 extends in the radial direction of the shock absorber spool 21 and forms an annular damping portion 214, and another damping hole, i.e., a second damping hole 215, is formed between the damping portion 214 and the inner wall of the first spool 22; the side wall of the damper valve body 21 is provided with a communication hole 216 along the radial direction of the damper valve body 21, the communication hole 216 communicates with the damper chamber 223 and the annular groove 213 and the damper chamber 211, respectively, and the communication hole 216 communicates with the damper chamber 211 through the second damping hole 215.

When the hydraulic oil in the buffer chamber 223 needs to enter the buffer chamber 211, the hydraulic oil can enter the buffer chamber 211 through the first damping hole 212 and the second damping hole 215. Two damping holes connected in parallel are arranged, so that hydraulic oil in the buffer chamber 223 can enter the buffer cavity 211 through the first damping hole 212 or the second damping hole 215 respectively, new hydraulic balance can be rapidly established through the plurality of damping holes by hydraulic oil pressure in the buffer overflow valve 100, the problem that the load of the hydraulic motor is heavy is rapidly responded, and the hydraulic motor can stably run.

In the present embodiment, the number of the damper holes is two, and the two damper holes are the first damper hole 212 and the second damper hole 215, respectively. It is to be understood that, in other embodiments, the number of the damping holes may be three or more, as long as a plurality of damping holes can be provided in parallel to the shock absorber spool 21 or the first spool 22, and accordingly, the damping function thereof can be achieved.

In the present embodiment, the communication hole 216 includes a first through hole 2161 and a second through hole 2162, and the first through hole 2161 and the second through hole 2162 are located at the left and right sides of the first damping hole 212 and the damping part 214, so that the second damping hole 215 located between the first through hole 2161 and the second through hole 2162 can be disposed in parallel with the first damping hole 212. The first through hole 2161 and the second through hole 2162 are opened along the radial direction of the damper spool 21. Wherein, the buffer chamber 223 is communicated with the annular groove 213 through the first through hole 2161; the buffer cavity 211 is communicated with the annular groove 213 through a second through hole 2162; the annular grooves 213 communicate with each other through second orifice holes 215. It is understood that in other embodiments, the first through hole 2161 and the second through hole 2162 may be opened along the axial direction of the damper spool 21 as long as the communication function thereof is achieved.

In this embodiment, the central axis of the first through hole 2161 and/or the second through hole 2162 is perpendicular to the central axis of the first damping hole 212. By such arrangement, the hydraulic oil can be communicated with the annular groove 213 through the first through hole 2161 and/or the second through hole 2162, so that the second damping hole 215 can better exert the parallel damping effect.

In the present embodiment, the second orifice 215 is provided at a position distant from the first orifice 212 so that the cushioning function of the two orifices can be more effectively exhibited. It is understood that in other embodiments, the first orifice 212 and the second orifice 215 may be respectively opened in parallel in the radial direction of the shock absorber valve body 21 as long as the damping function of the two orifices can be achieved.

In one embodiment, in order to facilitate guiding the hydraulic oil in the buffer chamber 223 to enter the two damping holes, the buffer valve core 21 is opened with a guiding port 217 towards the first valve core 22; the guide port 217 communicates with the first damping hole 212 and the first through hole 2161, respectively.

In one embodiment, the damper spool 21 is provided with an abutment boss 218 on a side relatively away from the oil inlet 121. The abutment boss 218 is used to abut against the valve body 11 and control a preset pressure between the damper spool 21 and the first spool 22. Accordingly, the valve body 11 contracts in the radial direction and forms the positioning portion 114, so that the damper spool 21 can abut against the positioning portion 114 when moving toward the oil inlet 121, and the elastic force between the first spool 22 and the damper spool 21 is maintained within a certain range.

In one embodiment, the abutment boss 218 is provided with a sealing ring 219 around its outer circumference in order to seal the cavity in which the elastic member 23 is provided. The arrangement is such that the pressure between the buffer cavity 211 and the valve cavity 111 of the buffer relief valve 100 cannot leak through the cavity provided with the elastic member 23.

The following concrete explanation the utility model discloses a theory of operation of buffering formula overflow valve 100 in the embodiment:

when the pressure in the oil inlet 121 is in a high-pressure state (when the pressure in the buffer chamber 223 and the buffer cavity 211 is not yet established), the hydraulic oil makes the first valve core 22 be separated from the abutting joint with the inner wall of the oil inlet 121, and flows into the valve cavity 111 from the oil inlet 121 and then flows out from the oil outlet 113; at this time, the hydraulic oil in the valve chamber 111 enters the damping flow passage 222 of the first spool 22 into the damping chamber 223; hydraulic oil in the buffer chamber 223 enters the buffer cavity 211 through two flow passages respectively, wherein the first flow passage is a guide port 217 and a first damping hole 212; the second flow path is the guide port 217, the first through hole 2161, the second orifice 215, and the second through hole 2162. In this way, the hydraulic oil in the buffer chamber 223 can enter the buffer cavity 211 through the first damping hole 212 or the second damping hole 215, so that the hydraulic oil pressure in the buffer relief valve 100 can quickly establish a new hydraulic balance through the two damping holes; at this time, the buffer valve core 21 is repressurized by the hydraulic oil in the buffer cavity 211 on the left side, and drives the first valve core 22 to move towards the oil inlet 121 and to abut against the inner wall of the oil inlet 121 again, so that the buffer overflow valve 100 is closed; if the first valve core 22 needs to be opened again, the pressure of the hydraulic oil needs to overcome the elastic force of the elastic element 23 at this time, so that the constant pressure relief function of the buffer relief valve 100 is realized.

The utility model provides a buffering formula overflow valve 100 is through setting up a plurality of parallelly connected damping holes for hydraulic oil pressure in buffering formula overflow valve 100 can establish new hydraulic pressure balance through the damping hole of a plurality of parallelly connected settings fast, thereby not only respond the heavier problem of hydraulic motor load rapidly, thereby makes hydraulic motor can the steady operation.

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.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A buffer overflow valve comprises a valve body assembly (10) and a valve core assembly (20), wherein the valve body assembly (10) is provided with a valve cavity (111), a valve port communicated with the valve cavity (111) and an oil outlet (113), the valve core assembly (20) is installed in the valve cavity (111) and can control the circulation state between the valve port and the oil outlet (113), the valve core assembly (20) comprises a buffer valve core (21), a first valve core (22) and an elastic part (23), the elastic part (23) is arranged between the first valve core (22) and the buffer valve core (21), and the first valve core is installed on one side relatively close to the valve port;

the damping valve is characterized in that the buffer valve core (21) is slidably mounted in the valve cavity (111) and is relatively far away from one side of the valve port, the buffer valve core (21) is provided with a buffer cavity (211) and at least two damping holes which are arranged in parallel, and the valve port is respectively communicated with the buffer cavity (211) through the at least two damping holes.

2. The buffer overflow valve according to claim 1, wherein the first valve core (22) is movably sleeved on the buffer valve core (21), a damping flow passage (222) communicated with the valve cavity (111) is formed in the first valve core (22), and the damping flow passage (222) is respectively communicated with the buffer cavity (211) through a damping hole of the buffer valve core (21).

3. The buffered excess flow valve of claim 2 wherein the orifice of the trim valve spool (21) comprises a first orifice (212) and the first orifice (212), the damping flow passage (222), and the valve port are coaxially disposed.

4. The buffer relief valve according to claim 3, wherein the damping hole of the cushion valve core (21) comprises a second damping hole (215), an annular groove (213) communicated with the damping flow passage (222) and the cushion chamber (211) is formed in the outer peripheral wall of the cushion valve core (21), a damping portion (214) is annularly arranged on the outer peripheral wall of the cushion valve core (21), the damping portion (214) is located in the annular groove (213), and the second damping hole (215) is formed between the damping portion (214) and the first valve core (22).

5. The buffer relief valve according to claim 4, wherein the buffer valve core (21) is further provided with a communication hole (216), the communication hole (216) comprises a first through hole (2161) and a second through hole (2162), and the first through hole (2161) is communicated with the damper flow passage (222) and the annular groove (213); the second through hole (2162) communicates the buffer chamber (211) and the annular groove (213).

6. The relief valve according to claim 5, wherein a central axis of the communication hole (216) is perpendicular to a central axis of the first orifice (212).

7. The buffer relief valve according to claim 4, wherein a guide port (217) communicating with the damping flow passage (222) is opened at one side of the buffer valve core (21) facing the first valve core (22), and the guide port (217) is communicated with the first damping hole (212) and the second damping hole (215), respectively.

8. The buffer relief valve according to claim 4, characterized in that the first valve core (22) is provided with a buffer chamber (223) communicated with the damping flow passage (222), the buffer valve core (21) is inserted into the buffer chamber (223), and the buffer chamber (223) is communicated with the buffer cavity (211) through the first damping hole (212) and the second damping hole (215), respectively.

9. The buffer overflow valve according to claim 1, wherein the valve body assembly (10) comprises a valve body (11) and a valve seat (12), the valve port is opened on the valve body (11), the valve seat (12) is disposed in the valve port and correspondingly opened with an oil inlet (121) communicated with the valve port, the first valve core (22) abuts against an inner wall of the oil inlet (121), and the valve body (11) and the valve seat (12) are connected with each other by clearance fit.

10. The buffered excess flow valve of claim 9 wherein an end of the valve seat (12) relatively close to the first valve element (22) extends in a radial direction of the valve seat (12) and forms an annular protrusion (123), the annular protrusion (123) having an outer diameter greater than an inner diameter of the valve port, and the annular protrusion (123) abutting the valve seat (12).

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