CN113685387B

CN113685387B - Pressure balance type water-based proportional reversing valve

Info

Publication number: CN113685387B
Application number: CN202110813855.6A
Authority: CN
Inventors: 吴会刚; 王伟; 徐龙; 王志民; 吴立男; 李艳杰; 刘晓萌; 王统诚
Original assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Current assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2023-10-27
Anticipated expiration: 2041-07-19
Also published as: CN113685387A

Abstract

The invention discloses a pressure balance type water-based proportional reversing valve which comprises a shell, a valve core assembly and a first reset spring. The valve cavity is provided with a peripheral wall surface, a first side surface and a second side surface, and the first side surface and the second side surface are oppositely arranged in the axial direction of the shell. The valve core assembly is arranged in the valve cavity, part of the peripheral surface of the valve core assembly is in clearance fit with part of the peripheral wall surface of the valve cavity, and the projection area of the first contact part along the axial direction of the shell is equal to that of the second contact part along the axial direction of the shell. One end of the first return spring is in contact with the first side surface, and the other end of the second return spring is in contact with part of the valve core assembly. The two sides of the valve core assembly in the axial direction of the shell are equal in pressure of liquid in the valve cavity, and the valve opening of the valve core assembly is driven to linearly change. The pressure balance type water-based proportional reversing valve has the advantages of simple structure and convenience in control.

Description

Pressure balance type water-based proportional reversing valve

Technical Field

The invention relates to the technical field of hydraulic transmission, in particular to a pressure balance type water-based proportional reversing valve.

Background

In the related art, some water-based proportional reversing valves directly drive a main valve core by utilizing a proportional electromagnet, a stepping motor and the like, and in order to obtain better proportional control performance, an electric signal is required to be converted into movement of a mechanical structural member through an electric-mechanical conversion element, so that the valve body structure and the control process of the valve core are complex.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the invention provides the pressure balance type water-based proportional reversing valve which is simple in structure and convenient to control the valve core.

According to an embodiment of the invention, a pressure balance type water-based proportional reversing valve comprises:

the valve comprises a shell, a valve cavity and a valve cover, wherein the valve cavity is provided with a peripheral wall surface, a first side surface and a second side surface, and the first side surface and the second side surface are oppositely arranged in the axial direction of the shell; and

the valve core assembly is arranged in the valve cavity, part of the outer peripheral surface of the valve core assembly is in clearance fit with part of the peripheral wall surface of the valve cavity, the valve core assembly comprises a first contact part and a second contact part, the first contact part faces one side of the shell in the axial direction, the second contact part faces the other side of the shell in the axial direction, the projection area of the first contact part along the axial direction of the shell is equal to the projection area of the second contact part along the axial direction of the shell, and therefore the liquid pressure born by one side of the valve core assembly in the axial direction of the shell in the valve cavity is equal to the liquid pressure born by the other side of the valve core assembly in the axial direction of the shell in the valve cavity;

and one end of the first return spring is contacted with the first side surface, and the other end of the second return spring is contacted with part of the valve core assembly.

According to the pressure balance type water-based proportional reversing valve provided by the embodiment of the invention, the two sides of the valve core assembly in the axial direction of the shell are equal to the pressure of liquid in the valve cavity, and the valve core assembly is controlled by only matching with the elastic force of the first reset spring.

Therefore, the pressure balance type water-based proportional reversing valve provided by the embodiment of the invention has the advantages of simple structure and convenience in control.

In some embodiments, the housing further has a liquid inlet, a liquid return port, a pilot port, and a working port, the liquid return port being located between the liquid inlet and the pilot port along an axial direction of the housing, the working port being open on the first side, the liquid inlet being located on a side of the liquid return port adjacent the first side, the pilot port being located on a side of the liquid return port adjacent the second side;

the valve cavity comprises a liquid inlet valve control cavity, a liquid inlet cavity, a liquid return cavity, a pilot control cavity and a liquid return valve control cavity, wherein the liquid inlet valve control cavity is communicated with the working port and the inner cavity of the valve core assembly, the liquid inlet cavity is communicated with the liquid inlet port, the liquid return cavity is communicated with the liquid return port, the pilot control cavity is communicated with the pilot port, and the liquid return valve control cavity is communicated with the inner cavity of the valve core assembly;

the valve core assembly is provided with a liquid inlet valve port and a liquid return valve port, the valve core assembly comprises a liquid inlet valve core and a liquid return valve core, the valve core assembly can move along the axial direction of the shell so that the liquid inlet valve port is blocked or communicated with the liquid inlet cavity and the inner cavity of the valve core assembly, and the liquid return valve core can move along the axial direction of the shell relative to the liquid inlet valve core so that the liquid return valve port is communicated or blocked with the liquid return cavity and the inner cavity of the valve core assembly.

In some embodiments, the pressure balanced water-based proportional reversing valve further comprises:

the first valve seat is arranged in the valve cavity, the first valve seat is positioned between the liquid inlet cavity and the liquid return cavity, the outer circumferential surface of the first valve seat is connected with the circumferential wall surface of the valve cavity, the first valve seat is provided with a first through hole and a communication cavity, the communication cavity is communicated with the first through hole and the liquid inlet cavity, the axial directions of the first through hole, the communication cavity and the shell are the same,

the liquid inlet valve core is provided with a first communication port, the first communication port penetrates through the peripheral wall of the liquid inlet valve core, the first communication port and the communication cavity form the liquid inlet valve port,

the second valve seat is arranged at one end of the liquid inlet valve core, which is far away from the first side face in the axial direction of the shell, at least part of the second valve seat is positioned in the liquid return cavity, at least part of the second valve seat is positioned between the liquid inlet valve core and the liquid return valve core in the axial direction of the shell, the second valve seat is provided with a second through hole, and the second through hole can be communicated with the inner cavity of the liquid inlet valve core and the inner cavity of the liquid return valve core.

In some embodiments, the inlet valve core has a first cavity and a second cavity, the first cavity is communicated with the second cavity, the radial dimension of the peripheral wall surface of the first cavity is larger than the radial dimension of the peripheral wall surface of the second cavity, the other end of the first return spring is positioned in the first cavity,

the liquid return valve core is provided with a third cavity and a fourth cavity, the second through hole can be communicated with the second cavity and the third cavity, the fourth cavity is communicated with the liquid return valve control cavity, the radial size of the peripheral wall surface of the third cavity is larger than that of the peripheral wall surface of the fourth cavity, the radial size of the peripheral wall surface of the second cavity is equal to that of the peripheral wall surface of the fourth cavity, and the radial size of the peripheral wall surface of the third cavity is smaller than that of the peripheral wall surface of the first cavity.

In some embodiments, the inlet valve core includes a first segment, a second segment, and a third segment, the second segment is connected between the first segment and the third segment, a radial dimension of an outer circumferential surface of the second segment is greater than a radial dimension of an outer circumferential surface of the first segment, a radial dimension of an outer circumferential surface of the first segment is greater than a radial dimension of an outer circumferential surface of the third segment, a radial dimension of a circumferential wall of the first cavity is equal to a radial dimension of an outer circumferential surface of the third segment, a radial dimension of an outer circumferential surface of the first segment is equal to a radial dimension of a circumferential wall of the communication cavity,

the liquid return valve core comprises a fourth section and a fifth section, the radial dimension of the outer peripheral surface of the first section is equal to the radial dimension of the outer peripheral surface of the fourth section, and the radial dimension of the outer peripheral surface of the third section is equal to the radial dimension of the outer peripheral surface of the fifth section.

In some embodiments, one end of the first section extends into the inlet valve control chamber, at least a portion of the second section is positioned in the inlet chamber, and the third section passes through the first through hole.

In some embodiments, the liquid inlet valve control cavity, the liquid inlet cavity, the liquid return cavity, the pilot control cavity and the liquid return valve control cavity are sequentially arranged at intervals along the axial direction of the shell, the fourth section is located between the liquid return cavity and the pilot control cavity, and the fourth cavity penetrates through one end, adjacent to the second side face, of the liquid return valve core.

In some embodiments, the liquid inlet valve control cavity, the liquid inlet cavity, the liquid return valve control cavity and the pilot control cavity are sequentially arranged at intervals along the axial direction of the shell, the fourth section is located between the liquid return cavity and the pilot control cavity, and the liquid return valve core is further provided with a second communication port which is communicated with the fourth cavity and the liquid return valve control cavity.

In some embodiments, the pressure balanced water-based proportional reversing valve further includes a second return spring, at least a portion of the second return spring being located within the third cavity, one end of the second return spring being in contact with the second valve seat, and the other end of the second return spring being in contact with the return spool.

In some embodiments, a first conical opening is formed in one side, adjacent to the first side surface, of the communication cavity, a part of the outer peripheral surface of the second section is a conical surface, an annular edge formed by intersecting the peripheral wall surface of the communication cavity and the peripheral wall surface of the first conical opening is tangential to the conical surface, and the first communication opening, the communication cavity and the first conical opening form the liquid inlet valve port;

the side of the third cavity adjacent to the first side face is provided with a second conical opening, the second conical opening forms the liquid return valve port, the side of the second valve seat adjacent to the second side face is provided with an annular convex face, and the annular convex face can be tangent to the peripheral wall face of the second conical opening.

Drawings

Fig. 1 is a schematic diagram of a pressure balanced water-based proportional reversing valve according to an exemplary embodiment of the present invention.

Fig. 2 is a schematic partial structural view of the pressure balance type water-based proportional reversing valve in fig. 1.

Fig. 3 is a schematic view of a partial structure of the pressure balance type water-based proportional directional valve in fig. 1.

Fig. 4 is a schematic diagram of another pressure balanced water-based proportional reversing valve according to an exemplary embodiment of the present invention.

Fig. 5 is a schematic diagram of the structure of the pressure balance type water-based proportional reversing valve in fig. 4 after reversing.

Reference numerals:

a first housing 100; a liquid inlet 101; a liquid inlet chamber 110; a feed valve control chamber 120; a work port 102;

a second housing 200; a liquid return port 201; a pilot 202; a liquid return chamber 210; a pilot control chamber 220; a liquid return valve control chamber 230;

a first valve seat 300; a communication chamber 301;

a second valve seat 400; a second through hole 401;

a liquid inlet valve core 500; a first communication port 501; a first cavity 502; a second cavity 503; a first section 510; a second section 520; a third section 530;

a liquid return valve core 600; a third cavity 601; a fourth cavity 602; a second communication port 603; a fourth section 610; a fifth section 620;

a first seal ring 710; a second seal ring 720; a third seal ring 730; a fourth seal ring 740; a fifth seal 750; a wire retainer 760;

a first return spring 810; and a second return spring 820.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The pressure balance type water-based proportional directional valve according to the embodiment of the present invention is described below with reference to the accompanying drawings.

As shown in fig. 1 to 5, the pressure balance type water-based proportional directional valve according to the embodiment of the present invention includes a housing, a valve core assembly, and a first return spring 810.

The housing is specifically a valve cavity, which has a peripheral wall surface, a first side surface, and a second side surface, and the first side surface and the second side surface are disposed opposite to each other in an axial direction of the housing (i.e., a left-right direction in fig. 1).

Specifically, the housing includes a first housing 100 and a second housing 200, the first housing 100 and the second housing 200 being disposed opposite to each other in the axial direction of the housing. The first side is provided in the first housing 100, and the second side is provided in the second housing 200. That is, the first side surface is an inner end surface of the first housing 100, and the second side surface is an inner end surface of the second housing 200.

The valve core assembly is arranged in the valve cavity, and part of the peripheral surface of the valve core assembly is in clearance fit with part of the peripheral wall surface of the valve cavity. The spool assembly includes a first contact portion facing one side of the housing in the axial direction (e.g., the right side of the housing in fig. 1) and a second contact portion facing the other side of the housing in the axial direction (e.g., the left side of the housing in fig. 1).

The projection area of the first contact part along the axial direction of the shell is equal to the projection area of the second contact part along the axial direction of the shell. It will be appreciated that the first contact portion comprises a plurality of right facing contact surfaces of the spool assembly and the second contact portion comprises a plurality of left facing contact surfaces of the spool assembly, the sum of the projected areas of the first contact portion from right to left being equal to the sum of the projected areas of the second contact portion from left to right.

Accordingly, the liquid pressure received by the right side of the spool assembly in the valve chamber is equal to the liquid pressure received by the left side of the spool assembly in the valve chamber, so that the liquid pressures received by the left and right sides of the spool assembly in the valve chamber are balanced.

One end of the first return spring 810 (e.g., the right end of the first return spring 810 in fig. 1) is in contact with the first side surface, and the other end of the second return spring 820 (e.g., the left end of the first return spring 810 in fig. 1) is in contact with a portion of the spool assembly.

According to the pressure balance type water-based proportional reversing valve provided by the embodiment of the invention, the two sides of the valve core assembly in the axial direction of the shell are equal to the pressure of liquid in the valve cavity, the resultant force of the valve core assembly in the valve cavity is the elastic force of the first return spring 810, the valve core assembly tends to the left side under the action of the elastic force of the first return spring 810, and the pressure balance type water-based proportional reversing valve is controlled to be reversed by only applying the driving force matched with the first return spring 810 to the valve core assembly. The elastic force of the first return spring 810 is linearly changed, so that the valve opening of the valve core assembly is driven to linearly change.

As shown in fig. 1 to 5, the housing further has a liquid inlet 101, a liquid return port 201, a pilot port 202 and a working port 102, wherein the working port 102, the liquid inlet 101, the liquid return port 201 and the pilot port 202 are sequentially arranged at intervals from right to left. Specifically, the liquid return port 201 is located between the liquid inlet 101 and the pilot port 202 along the axial direction of the housing, the working port 102 is opened on the first side, the liquid inlet 101 is located on a side of the liquid return port 201 adjacent to the first side, and the pilot port 202 is located on a side of the liquid return port 201 adjacent to the second side.

The valve chamber includes a feed valve control chamber 120, a feed chamber 110, a return chamber 210, a pilot control chamber 220, and a return valve control chamber 230. The liquid inlet valve control cavity 120 is communicated with the working port 102 and the inner cavity of the valve core assembly, the liquid inlet cavity 110 is communicated with the liquid inlet port 101, the liquid return cavity 210 is communicated with the liquid return port 201, the pilot control cavity 220 is communicated with the pilot port 202, and the liquid return valve control cavity 230 is communicated with the inner cavity of the valve core assembly.

The valve core assembly is provided with a liquid inlet valve port and a liquid return valve port, the valve core assembly comprises a liquid inlet valve core 500 and a liquid return valve core 600, and the valve core assembly can move along the axial direction of the shell so that the liquid inlet valve port blocks or communicates with the liquid inlet cavity 110 and the inner cavity of the valve core assembly. That is, when the valve core assembly moves to a position along the axial direction of the housing and continues to move, the liquid inlet valve port can be communicated with the liquid inlet cavity 110 and the inner cavity of the valve core assembly; when the valve core assembly returns to the one position along the axial direction of the shell and continues to return, the liquid inlet valve port can block the liquid inlet cavity 110 and the inner cavity of the valve core assembly.

The return spool 600 can move axially relative to the inlet spool 500 along the housing so that the return port communicates with or blocks the return chamber 210 and the interior cavity of the spool assembly. That is, when the liquid return valve core 600 moves to another position along the axial direction of the housing relative to the liquid inlet valve core 500 and continues to move, the liquid return valve port can block the liquid return cavity 210 and the inner cavity of the valve core assembly; when the return valve core 600 returns to the other position along the axial direction of the housing relative to the inlet valve core 500 and continues to return, the return valve port can communicate the return chamber 210 with the inner chamber of the valve core assembly.

It will be appreciated that the resultant force of the fluid pressures experienced by the cartridge assembly in the first housing 100 in the housing axial direction is equal to the resultant force of the fluid pressures experienced by the cartridge assembly in the second housing 200 in the housing axial direction.

In some embodiments, as shown in fig. 1-5, the pressure balanced water-based proportional reversing valve of an embodiment of the present invention further includes a first valve seat 300 and a second valve seat.

The first valve seat 300 is disposed in the valve cavity, the first valve seat 300 is disposed between the liquid inlet chamber 110 and the liquid return chamber 210, and an outer peripheral surface of the first valve seat 300 is connected to a peripheral wall surface of the valve cavity. Specifically, a portion of the first valve seat 300 is located in the first housing 100, and the portion of the first valve seat 300 is connected to the right end of the first housing 100, another portion of the first valve seat 300 is located in the second housing 200, and the other portion of the first valve seat 300 is connected to the right end of the second housing 200.

The first valve seat 300 has a first through hole and a communication chamber 301, the communication chamber 301 communicates the first through hole with the liquid inlet chamber 110, and the axial directions of the first through hole, the communication chamber 301 and the housing are the same.

The inlet valve body 500 has a first communication port 501, the first communication port 501 penetrates through the peripheral wall of the inlet valve body 500, and the first communication port 501 and the communication chamber 301 form an inlet valve port.

It can be appreciated that when the valve core assembly moves along the axial direction of the housing and the first communication port 501 is communicated with the communication cavity 301, the liquid inlet valve port is communicated with the liquid inlet cavity 110 and the inner cavity of the valve core assembly; when the first communication port 501 is not communicated with the communication cavity 301, the liquid inlet valve port is connected with the inner cavity of the liquid inlet cavity 110 and the valve core assembly.

The second valve seat is provided at an end of the intake valve spool 500 away from the first side surface in the axial direction of the housing (e.g., the left end of the intake valve spool 500 in fig. 1), at least part of the second valve seat is located in the return chamber 210, and at least part of the second valve seat is located between the intake valve spool 500 and the return valve spool 600 in the axial direction of the housing. The second valve seat has a second through hole 401, and the second through hole 401 can be communicated with the inner cavity of the liquid inlet valve core 500 and the inner cavity of the liquid return valve core 600.

It can be appreciated that the liquid return valve core 600 moves along the axial direction of the housing, and when the liquid return valve core 600 contacts the second valve seat, the liquid return valve port blocks the liquid return cavity 210 and the inner cavity of the valve core assembly; when the liquid return valve core 600 is separated from the second valve seat, the liquid return valve port is communicated with the liquid return cavity 210 and the inner cavity of the valve core assembly.

In some embodiments, as shown in fig. 1-5, the inlet spool 500 has a first cavity 502 and a second cavity 503. The first cavity 502 communicates with the second cavity 503, and the radial dimension of the peripheral wall surface of the first cavity 502 is larger than the radial dimension of the peripheral wall surface of the second cavity 503, and the other end of the first return spring 810 is located in the first cavity 502.

As shown in fig. 1, 2, 4 and 5, the right end of the first return spring 810 abuts against the first side surface, and the left end of the first return spring 810 abuts against the first step surface between the first cavity 502 and the second cavity 503. It will be appreciated that the first step surface may be planar, conical, or other type of surface that intersects both the perimeter wall of the first cavity 502 and the perimeter wall of the second cavity 503.

Therefore, the liquid inlet valve core 500 can move leftwards under the action of the elastic force of the first spring, or the liquid inlet valve core 500 can be contacted with the first valve seat 300 under the action of the elastic force of the first spring, so that the liquid inlet 101 is closed, that is, the liquid inlet valve port blocks the liquid inlet cavity 110 and the inner cavity of the valve core assembly.

As shown in fig. 1 to 5, the liquid return valve body 600 has a third cavity 601 and a fourth cavity 602, the second through hole 401 is capable of communicating the second cavity 503 and the third cavity 601, and the third cavity 601 is provided on the right side of the fourth cavity 602.

The fourth cavity 602 is communicated with the liquid return valve control cavity 230, the liquid return valve port is arranged at the right side of the third cavity 601, and the radial dimension of the peripheral wall surface of the third cavity 601 is larger than that of the peripheral wall surface of the fourth cavity 602, so that the liquid return valve port is beneficial to communicating or blocking the liquid return cavity 210 and the inner cavity of the valve core assembly.

The radial dimension of the peripheral wall surface of the second cavity 503 is equal to the radial dimension of the peripheral wall surface of the four cavities, and the radial dimension of the peripheral wall surface of the third cavity 601 is smaller than the radial dimension of the peripheral wall surface of the first cavity 502. Therefore, the projected area of the first stepped surface in the axial direction of the housing is equal to the projected area of the left end surface of the liquid return spool 600 in the axial direction of the housing. In addition, the diameter of the annular contact line formed when the liquid return valve core 600 contacts the second valve seat is equal to the radial dimension of the peripheral wall surface of the first cavity 502, so that the valve core assembly is ensured to be subjected to the balanced pressure of the liquid in the valve cavity.

Thus, the pressure balanced water-based proportional reversing valve of the embodiment of the present invention is advantageous in that the resultant force of the fluid pressures in the housing axial direction, which the spool assembly receives in the first housing 100, is equal to the resultant force of the fluid pressures in the housing axial direction, which the spool assembly receives in the second housing 200.

In some embodiments, as shown in fig. 1-5, the inlet spool 500 includes a first section 510, a second section 520, and a third section 530, the second section 520 being connected between the first section 510 and the third section 530, and the return spool 600 includes a fourth section 610 and a fifth section 620. One end of the first section 510 (e.g., the right end of the first end in fig. 1) extends into the inlet valve control chamber 120, at least a portion of the second section 520 is positioned within the inlet chamber 110, and the third section 530 extends through the first throughbore.

The radial dimension of the outer peripheral surface of the second section 520 is larger than the radial dimension of the outer peripheral surface of the first section 510, the radial dimension of the outer peripheral surface of the first section 510 is larger than the radial dimension of the outer peripheral surface of the third section 530, the radial dimension of the peripheral wall surface of the first cavity 502 is equal to the radial dimension of the outer peripheral surface of the third section 530, and the radial dimension of the outer peripheral surface of the first section 510 is equal to the radial dimension of the peripheral wall surface of the communication chamber 301.

Therefore, the sum of the projected areas of the liquid-contacting surfaces on the right side of the liquid inlet valve body 500 in the axial direction of the housing is equal to the sum of the projected areas of the liquid-contacting surfaces on the left side of the liquid inlet valve body 500 in the axial direction of the housing.

The radial dimension of the outer circumferential surface of the first segment 510 is equal to the radial dimension of the outer circumferential surface of the fourth segment 610, and the radial dimension of the outer circumferential surface of the third segment 530 is equal to the radial dimension of the outer circumferential surface of the fifth segment 620.

Therefore, the sum of the projected areas of the liquid-contacting surfaces on the right side of the spool assembly in the axial direction of the housing is equal to the sum of the projected areas of the liquid-contacting surfaces on the left side of the spool assembly in the axial direction of the housing.

In some embodiments, as shown in fig. 1-3, the inlet valve control chamber 120, the inlet chamber 110, the return chamber 210, the pilot control chamber 220, and the return valve control chamber 230 are sequentially spaced apart along the axial direction of the housing, a fourth segment 610 is located between the return chamber 210 and the pilot control chamber 220, a fourth cavity 602 extends through an end of the return spool 600 adjacent to the second side, and the fourth cavity 602 communicates with the return valve control chamber 230. Therefore, when no fluid is introduced into the pilot control chamber 220, the right side of the fourth section 610 is subjected to the fluid pressure, and the return valve element 600 can move leftwards, so that the return port 201 is opened, that is, the return port communicates with the return chamber 210 and the inner cavity of the valve element assembly.

In other embodiments, as shown in fig. 4 and 5, the inlet valve control chamber 120, the inlet chamber 110, the return chamber 210, the return valve control chamber 230 and the pilot control chamber 220 are sequentially disposed at intervals along the axial direction of the housing, and the fourth segment 610 is located between the return chamber 210 and the pilot control chamber 220, and the return valve core 600 further has a second communication port 603, where the second communication port 603 communicates with the fourth cavity 602 and the return valve control chamber 230. Therefore, when no fluid is introduced into the pilot control chamber 220, the right side of the fourth section 610 is subjected to the fluid pressure, and the return valve element 600 can move leftwards, so that the return port 201 is opened, that is, the return port communicates with the return chamber 210 and the inner cavity of the valve element assembly.

As shown in fig. 1 to 5, the pressure balance type water-based proportional reversing valve according to the embodiment of the present invention further includes a first sealing ring 710, a second sealing ring 720, a third sealing ring 730, a fourth sealing ring 740, a fifth sealing ring 750, and a wire retainer 760.

As shown in fig. 1 to 5, a first seal 710 is provided between the inlet valve control chamber 120 and the inlet chamber 110 to seal the inlet valve control chamber 120 and the inlet chamber 110. Specifically, the inner peripheral surface of the second housing 200 is provided with a first annular groove, the first seal ring 710 is disposed in the first annular groove, and the first seal ring 710 contacts the outer peripheral surface of the first section 510 of the inlet valve core 500.

As shown in fig. 1 to 5, a second seal 720 is provided between the communication chamber 301 and the return chamber 210 to seal the communication chamber 301 and the return chamber 210. Specifically, the inner peripheral surface of the first valve seat 300 has a second annular groove, and the second seal ring 720 is disposed in the second annular groove, and the second seal ring 720 contacts the outer peripheral surface of the third section 530 of the inlet valve core 500.

As shown in fig. 1-3, a third seal 730 is provided between the return chamber 210 and the pilot chamber 220 to seal the return chamber 210 and the pilot chamber 220. A fourth seal 740 is provided between pilot control chamber 220 and return valve control chamber 230 to seal pilot control chamber 220 and return valve control chamber 230. A fifth seal 750 is positioned in the gap between the second valve seat and the inlet valve spool 500 to seal the return chamber 210 and the second cavity 503 of the valve spool.

As shown in fig. 4 and 5, a third seal ring 730 is provided between the return chamber 210 and the return valve control chamber 230 to seal the return chamber 210 and the return valve control chamber 230. A fourth seal 740 is provided between pilot control chamber 220 and return valve control chamber 230 to seal pilot control chamber 220 and return valve control chamber 230. The fifth seal 750 is located between the outer peripheral surface of the third section 530 of the inlet valve spool 500 and the inner peripheral surface of the second valve seat corresponding to the third section 530 to seal the return chamber 210 and the second cavity 503 of the spool.

Specifically, the outer circumferential surface of the fourth section 610 of the liquid return valve core 600 is provided with a third groove, the third seal ring 730 is disposed in the third groove, and the third seal ring 730 contacts the inner circumferential surface of the first housing 100. The outer circumferential surface of the fifth section 620 of the liquid return valve core 600 is provided with a fourth groove, a fourth sealing ring 740 is arranged in the fourth groove, and the fourth sealing ring 740 contacts with the inner circumferential surface of the first housing 100.

As shown in fig. 1 to 5, the wire retainer 760 is provided between the outer circumferential surface of the third section 530 of the inlet valve body 500 and the inner circumferential surface of the second valve seat corresponding to the third section 530, thereby fixing the inlet valve body 500 and the second valve seat to connect the inlet valve body 500 and the second valve seat together.

In some embodiments, as shown in fig. 4 and 5, the pressure balance type water-based proportional reversing valve according to the embodiment of the present invention further includes a second return spring 820, at least part of the second return spring 820 is located in the third cavity 601, one end of the second return spring 820 (e.g., the right end of the second return spring 820 in fig. 3) is in contact with the second valve seat, and the other end of the second return spring 820 (e.g., the left end of the second return spring 820 in fig. 3) is in contact with the return valve core 600.

Specifically, the right end of the second return spring 820 abuts against the second valve seat, the left end of the second return spring 820 extends into the third cavity 601, and the left end of the third return spring abuts against the second step surface between the third cavity 601 and the fourth cavity 602. It will be appreciated that the second step surface may be a planar surface, may be a conical surface, or may be another type of surface that can intersect both the peripheral wall surface of the third cavity 601 and the peripheral wall surface of the fourth cavity 602.

Therefore, the second return spring 820 facilitates the leftward movement of the return spool 600, facilitating the return of the return spool 600.

In some embodiments, as shown in fig. 1-5, a first conical opening is formed on a side, adjacent to the first side, of the communication cavity 301, a part of the outer circumferential surface of the second section 520 is a conical surface, an annular edge formed by intersecting the circumferential wall surface of the communication cavity 301 and the circumferential wall surface of the first conical opening is tangential to the conical surface, and the first communication opening 501, the communication cavity 301 and the first conical opening form a liquid inlet valve port. Therefore, the stability of the liquid flow of the liquid inlet valve port is improved

The side of the third cavity 601 adjacent to the first side surface is provided with a second conical opening, the second conical opening forms a liquid return valve port, the side of the second valve seat adjacent to the second side surface is provided with an annular convex surface, and the annular convex surface can be tangent to the peripheral wall surface of the second conical opening. Therefore, the second valve seat can control the opening and closing and the opening of the liquid return valve port, and the second valve seat can also improve the centering capability of the valve core assembly and provide a guiding function for the valve core assembly.

As shown in fig. 4 and 5, the liquid inlet 101 is disposed obliquely, and one end of the liquid inlet 101 communicating with the liquid inlet chamber 110 is inclined to a side away from the first side surface (e.g., left side in fig. 3), thereby facilitating the liquid entering from the liquid inlet 101 to enter into the communicating chamber 301. The pilot port 202 is disposed obliquely, and an end of the pilot port 202 communicating with the return valve control chamber 230 is inclined to a side adjacent to the second side (left side in fig. 3), thereby facilitating entry of the liquid entering from the pilot port 202 into the return valve control chamber 230.

The working process of the pressure balance type water-based proportional reversing valve according to the embodiment of the invention is described below with reference to the accompanying drawings.

As shown in fig. 1-3, when the pressure balance type water-based proportional reversing valve is in the neutral position, the liquid inlet valve core 500 is positioned at the leftmost side under the action of the elastic force of the first return spring 810, the wall surface of the first through hole seals the communication port, and the liquid inlet valve port blocks the liquid inlet cavity 110 and the second cavity 503, that is, the liquid inlet 101 is closed. The liquid return valve core 600 is positioned at the leftmost side, the liquid return valve core 600 is separated from the second valve seat, the liquid return valve port is communicated with the liquid inlet cavity 110 and the third cavity 601, i.e. the liquid return port 201 is opened.

At this time, the sum of the projected areas of the right end surface of the liquid return valve body 600, the circumferential wall surface of the liquid return valve port, and the second stepped surface in the axial direction is equal to the sum of the projected areas of the left side surface of the fourth section 610, the left end surface of the liquid return valve body 600, and the chamfered tapered surface of the left end of the liquid return valve body 600 in the axial direction.

The sum of the projected areas of the right end face of the liquid inlet valve spool 500, the right side face of the second section 520, the first stepped face, and the right end face of the second valve seat in the axial direction is equal to the sum of the projected areas of the left side face of the second section 520 and the left side face of the second valve seat (the sum of the annular convex face and the bottom wall face of the second through hole 401).

During reversing, liquid is introduced from the pilot port 202 into the pilot control chamber 220, squeezing the left side of the fourth segment 610, causing the return spool 600 to move to the right. After the liquid return valve core 600 contacts with the second valve seat, liquid is continuously introduced into the pilot control cavity 220 from the pilot port 202, the elasticity of the first spring is overcome, the liquid return valve core 600 and the liquid inlet valve core 500 move rightwards together, after the liquid inlet valve core 500 moves rightwards for a certain distance, the communication port penetrates through the first through hole, the liquid inlet valve port is communicated with the liquid inlet cavity 110 and the second cavity 503, namely, the liquid inlet port 101 is opened.

The operation of another pressure balance type water-based proportional directional valve according to the embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 4 and 5, when the pressure balance type water-based proportional directional valve is in the neutral position, the liquid inlet valve core 500 is positioned at the leftmost side under the action of the elastic force of the first return spring 810, the wall surface of the first through hole seals the communication port, and the liquid inlet valve port blocks the liquid inlet cavity 110 and the second cavity 503, that is, the liquid inlet 101 is closed. The liquid return valve core 600 is positioned at the leftmost side under the action of the elastic force of the second return spring 820, the liquid return valve core 600 is separated from the second valve seat, and the liquid return valve port is communicated with the liquid inlet cavity 110 and the third cavity 601, namely the liquid return port 201 is opened.

At this time, the sum of the projected areas of the right end surface of the return valve body 600, the peripheral wall surface of the return valve port, the second stepped surface, and the left side surface of the fourth cavity 602 in the axial direction is equal to the sum of the projected areas of the left side surface of the fourth segment 610, the left end surface of the return valve body 600, and the chamfered tapered surface of the left end of the return valve body 600 in the axial direction.

During reversing, liquid is introduced from the pilot port 202 to the pilot control chamber 220, and the left end surface of the liquid return valve element 600 is extruded, so that the liquid return valve element 600 moves rightward against the elastic force of the second spring. After the liquid return valve core 600 contacts with the second valve seat, liquid is continuously introduced into the pilot control cavity 220 from the pilot port 202, the elasticity of the first spring is overcome, the liquid return valve core 600 and the liquid inlet valve core 500 move rightwards together, after the liquid inlet valve core 500 moves rightwards for a certain distance, the communication port penetrates through the first through hole, the liquid inlet valve port is communicated with the liquid inlet cavity 110 and the second cavity 503, namely, the liquid inlet port 101 is opened.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A pressure balanced water-based proportional reversing valve, comprising:

a housing having a valve chamber with a peripheral wall surface, a first side surface, and a second side surface, the first side surface and the second side surface being disposed opposite to each other in an axial direction of the housing; and

a first return spring having one end in contact with the first side and the other end in contact with a portion of the valve cartridge assembly;

the housing includes a first housing and a second housing, which are disposed opposite to each other in an axial direction of the housing.

2. The pressure balanced, water-based proportional reversing valve of claim 1, wherein the housing further has a fluid inlet, a fluid return, a pilot, and a working port, the fluid return being located between the fluid inlet and the pilot along an axial direction of the housing, the working port being open on the first side, the fluid inlet being located on a side of the fluid return adjacent the first side, the pilot being located on a side of the fluid return adjacent the second side;

3. The pressure balanced, water-based proportional reversing valve of claim 2, further comprising:

4. The pressure balance type water-based proportional reversing valve according to claim 3, wherein the liquid inlet valve core is provided with a first cavity and a second cavity, the first cavity is communicated with the second cavity, the radial dimension of the peripheral wall surface of the first cavity is larger than that of the peripheral wall surface of the second cavity, the other end of the first return spring is positioned in the first cavity,

5. The pressure balanced water-based proportional reversing valve according to claim 4, wherein the liquid-intake valve spool includes a first segment, a second segment, and a third segment, the second segment is connected between the first segment and the third segment, a radial dimension of an outer peripheral surface of the second segment is larger than a radial dimension of an outer peripheral surface of the first segment, a radial dimension of an outer peripheral surface of the first segment is larger than a radial dimension of an outer peripheral surface of the third segment, a radial dimension of a peripheral wall surface of the first cavity is equal to a radial dimension of an outer peripheral surface of the third segment, a radial dimension of an outer peripheral surface of the first segment is equal to a radial dimension of a peripheral wall surface of the communication chamber,

6. The pressure balanced, water-based proportional reversing valve of claim 5, wherein one end of the first segment extends into the inlet valve control chamber, at least a portion of the second segment is positioned within the inlet chamber, and the third segment extends through the first throughbore.

7. The pressure balanced, water-based proportional reversing valve of claim 5, wherein the inlet valve control chamber, the inlet chamber, the return chamber, the pilot control chamber, and the return valve control chamber are sequentially spaced apart along an axial direction of the housing, the fourth segment is positioned between the return chamber and the pilot control chamber, and the fourth cavity extends through an end of the return spool adjacent the second side.

8. The pressure balanced water-based proportional reversing valve according to claim 5, wherein the liquid inlet valve control chamber, the liquid inlet chamber, the liquid return valve control chamber and the pilot control chamber are sequentially arranged at intervals along the axial direction of the shell, the fourth section is positioned between the liquid return chamber and the pilot control chamber, the liquid return valve core is further provided with a second communication port, and the second communication port is communicated with the fourth cavity and the liquid return valve control chamber.

9. The pressure balanced, water-based proportional reversing valve of any one of claims 5 to 8, further comprising a second return spring, at least a portion of the second return spring being located within the third cavity, one end of the second return spring being in contact with the second valve seat and the other end of the second return spring being in contact with the return spool.

10. The pressure balance type water-based proportional reversing valve according to any one of claims 5 to 8, wherein a first conical port is formed in one side, adjacent to the first side surface, of the communication cavity, a part of the outer peripheral surface of the second section is a conical surface, an annular edge formed by intersecting the peripheral wall surface of the communication cavity with the peripheral wall surface of the first conical port is tangential to the conical surface, and the first communication port, the communication cavity and the first conical port form the liquid inlet valve port;