Multi-way valve

Abstract

The utility model relates to the technical field of hydraulic pressure, in particular to a multi-way valve. A multi-way valve comprises a valve body, and a pressure oil duct, a working oil duct and an oil return duct are arranged in the valve body; the valve core is assembled in the valve body in a sliding manner; the one-way valve is arranged aiming at the working oil duct and comprises a retaining cavity; a first oil channel and a second oil channel are further formed in the valve body, one end of the first oil channel communicates with the maintaining cavity, and the other end of the first oil channel extends to the peripheral face of the valve element to form a first oil port. One end of the second oil duct extends to the peripheral surface of the valve element to form a second oil port, the other end of the second oil duct is communicated with the oil return duct, an internal oil duct is arranged in the valve element, and when the valve element is located at the middle position, the internal oil duct is axially staggered with the first oil port and the second oil port; the valve element slides in the axial direction so that the inner oil way can be communicated with the first oil port and the second oil port. The technical problems that in the prior art, a retaining structure of a multi-way valve is large in oil leakage amount and poor in load retaining effect are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulics, and particularly relates to a multi-way valve. Background Art

[0002] When the spool of a load-holding cartridge multi-way valve is in the neutral position, due to the gravity of the working device, a certain pressure is generated on the actuator (cylinder), and this pressure will be transmitted to the main valve through the pipeline. Since there must be a certain gap between the spools of the main valve, it is easy to cause a certain amount of leakage, resulting in the phenomenon of arm dropping. In actual use, the load cannot be maintained, thus affecting the normal operation.

[0003] To solve this problem, a document with the application number CN201721407634.4 discloses a load-holding cartridge multi-way valve, which includes a valve body, a spool disposed in the valve body, an oil port A, an oil port B, an oil port P, an oil port T and a TS oil passage located on the valve body. The valve body is provided with a check valve and a B-port safety valve. The valve body also has an eighth oil passage and an eleventh oil passage that communicate with the check valve. The eighth oil passage is connected to the B-port safety valve. The tenth oil passage and the ninth oil passage are successively communicated on the eleventh oil passage. The ninth oil passage is connected to the spool. The spool moves to control the communication or disconnection between the ninth oil passage and the fourth oil passage. When the spool is in the neutral position, the check valve, the eighth oil passage, the eleventh oil passage, the tenth oil passage, the ninth oil passage and the B-port safety valve are connected to form a closed cavity, and the pressure oil at the oil port B acts on the check valve to make the check valve reverse cut-off to hold the load.

[0004] The above document forms a closed cavity by setting a check valve and an oil passage communicating with the spring cavity of the check valve, so that the check valve can reverse cut-off to hold the load when the spool is in the neutral position. However, in the above application, the ninth oil passage is connected to the spool. Since there is a gap between the spool and the valve body, when the spool is in the neutral position, the oil in the ninth oil passage will also flow to the fourth oil passage in the circumferential and axial directions at the same time, resulting in the leakage of the oil to the TS oil passage and finally returning oil through the oil port T. The TS oil passage is arranged around the spool, so the oil in the ninth oil passage only needs to axially flow through the shortest axial distance from the ninth oil passage to the TS oil passage to leak to the TS oil passage. The leakage path is short, the covering area is small, the leakage amount is large, and the load-holding effect is poor. Summary of the Utility Model

[0005] In order to solve the technical problem that the holding structure of the multi-way valve in the prior art has a large amount of oil leakage and a poor load-holding effect, the utility model provides a multi-way valve, which solves the above technical problem.

[0006] In order to solve the above technical problem, the utility model provides a multi-way valve, including:

[0007] A valve body, in which a pressure oil passage, a working oil passage and a return oil passage are arranged;

[0008] A spool valve core, which is slidably assembled in the valve body;

[0009] A check valve, which is provided for the working oil passage and includes a holding cavity;

[0010] The valve body is further provided with a first oil passage and a second oil passage. One end of the first oil passage communicates with the holding cavity, and the other end of the first oil passage extends to the outer peripheral surface of the spool valve core to form a first oil port; one end of the second oil passage extends to the outer peripheral surface of the spool valve core to form a second oil port, and the other end of the second oil passage communicates with the oil return passage. An internal oil passage is provided in the spool valve core. When the spool valve core is in the middle position, the internal oil passage is axially misaligned with both the first oil port and the second oil port, and the axial sliding of the spool valve core can make the internal oil passage communicate with both the first oil port and the second oil port.

[0011] According to an embodiment of the present invention, the first oil port and the second oil port are located in the same circumferential direction.

[0012] According to an embodiment of the present invention, two first oil ports are provided, and the two first oil ports are symmetrically arranged relative to the spool valve core, and the second oil port is located in the middle of the two first oil ports.

[0013] According to an embodiment of the present invention, the internal oil passage includes an oil inlet and an oil outlet, both of which are located on the outer peripheral surface of the spool valve core. The oil inlet is arranged corresponding to the first oil port, and the oil inlet and the corresponding first oil port are located in the same circumferential position and have an axial distance. The oil outlet is arranged corresponding to the second oil port, and the oil outlet and the corresponding second oil port are located in the same circumferential position and have an axial distance.

[0014] According to an embodiment of the present invention, the internal oil passage is in a T shape, there are two oil inlets, the two oil inlets are located on the same straight line, and the oil outlet is located between the two oil inlets.

[0015] According to an embodiment of the present invention, the oil inlet and / or the oil outlet extends axially, and the oil inlet and / or the oil outlet extends in a direction away from the first oil port and the second oil port.

[0016] According to an embodiment of the present invention, an anti-rotation structure is provided on the spool valve core.

[0017] According to an embodiment of the present invention, the anti-rotation structure includes a positioning ring, which is sleeved on the spool valve core. The positioning ring is in keyway fit with the spool valve core and is also in keyway fit with the valve body.

[0018] According to an embodiment of the present utility model, the positioning ring is limited by a retaining ring, and the retaining ring is assembled on the valve body.

[0019] According to an embodiment of the present utility model, one end of the working oil passage extends to the spool, the other end of the working oil passage forms a working port, the one-way valve includes a one-way valve spool and an elastic member, the elastic member is located in the holding cavity and acts on the one-way valve spool, and a third oil passage is formed on the valve body. The oil fluid entering the working oil passage through the working port can enter the holding cavity through the third oil passage.

[0020] Based on the above technical solutions, the technical effects that the present utility model can achieve are as follows:

[0021] 1. For the multi-way valve of the present utility model, by arranging an internal oil passage in the spool, and when the spool is in the neutral position, the internal oil passage is axially misaligned with both the first oil port and the second oil port. In this way, when the spool is in the neutral position, the oil fluid in the holding cavity flows through the first oil passage to the first oil port, and needs to move through the axial clearance to the inlet of the internal oil passage to enter the internal oil passage, flow out from the outlet of the internal oil passage, and then move through the axial clearance to the second oil port, and then can drain oil to the return oil passage through the second oil passage. Compared with the existing structure, the path for the oil fluid in the holding cavity to axially leak to the return oil passage of the present utility model increases, the covering amount increases, and the leakage amount decreases. In actual use, the load can be maintained to ensure the normal operation of the work; when the working oil passage corresponding to the one-way valve needs to return oil, the spool can slide to the first oil passage and communicate with the second oil passage through the internal oil passage in the spool, so that the oil fluid in the holding cavity returns oil, and the acting force in the holding cavity is small, the one-way valve can be opened, and the working oil passage can return oil;

[0022] 2. For the multi-way valve of the present utility model, the first oil port and the second oil port are arranged in the same circumferential direction. The inlet of the internal oil passage and the first oil port are in the same circumferential position and have an axial distance, and the outlet and the second oil port are in the same circumferential position and have an axial distance. Then, the spool only needs to slide axially to make its internal oil passage communicate with both the first oil port and the second oil port at the same time;

[0023] 3. For the multi-way valve of the present utility model, in order to limit the spool to only move axially, an anti-rotation structure is also arranged on the spool. The anti-rotation structure includes a positioning ring, and keyway fits are provided between the positioning ring and the spool and between the positioning ring and the valve body, which can play a role in preventing the spool from rotating and making the spool only move axially. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the multi-way valve of the present utility model;

[0025] Figure 2 is the front view of the multi-way valve;

[0026] Figure 3It is a sectional view of a multi-way valve;

[0027] Figure 4 It is Figure 3 an enlarged view of part C of

[0028] Figure 5 It is Figure 2 a sectional view A-A of

[0029] Figure 6 It is Figure 5 an enlarged view of part D of

[0030] Figure 7 It is Figure 2 a sectional view B-B of

[0031] Figure 8 It is the front view of the valve core;

[0032] Figure 9 It is Figure 8 a sectional view E-E of

[0033] Figure 10 It is Figure 8 a sectional view F-F of

[0034] Figure 11 It is the top view of the valve core;

[0035] Figure 12 It is Figure 11 a sectional view G-G of

[0036] Figure 13 It is the structural schematic diagram of the check valve;

[0037] Figure 14 It is the sectional view of the check valve;

[0038] Figure 15 It is the structural schematic diagram of the positioning ring;

[0039] In the figure: 1-valve body; 11-pressure oil passage; 12-first working oil passage; 121-first working oil port; 13-second working oil passage; 131-second working oil port; 14-return oil passage; 15-first oil passage; 151-first oil port; 16-second oil passage; 161-second oil port; 17-first intermediate oil passage; 18-second intermediate oil passage; 2-valve core; 21-internal oil passage; 211-inlet port; 212-outlet port; 22-long groove; 3-check valve; 31-check valve core; 311-third oil passage; 32-elastic member; 33-plug; 34-holding cavity; 41-first safety valve; 42-second safety valve; 6-compensation valve; 7-positioning ring; 71-annular body; 72-inner key; 73-outer key; 8-retaining ring. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0044] For ease of description, spatial relative terms, such as "above", "over", "on the upper surface", "upper", etc., can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figure for the device. For example, if the device in the drawing is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations will be made for the spatial relative descriptions used here.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0046] As Figure 1 - 15 shown, this embodiment provides a multi-way valve, including a valve body 1 and a valve core 2. A plurality of oil channels are provided in the valve body 1, and the valve core 2 is slidably assembled in the valve body 1 to slidably control the on / off between the oil channels.

[0047] The valve body 1 is in a block shape. A through mounting hole is provided in the valve body 1 to facilitate the assembly of the valve core 2. A number of oil channels and oil ports are also provided in the valve body 1 to facilitate the access of oil. Specifically, a pressure oil channel 11, working oil channels, and a return oil channel 14 are provided in the valve body 1. One end of the pressure oil channel 11 forms a pressure oil port P to introduce pressure oil, and the other end of the pressure oil channel 11 extends to communicate with the mounting hole. There are two working oil channels, namely a first working oil channel 12 and a second working oil channel 13. One end of the first working oil channel 12 forms a first working oil port 121, and the other end extends to communicate with the mounting hole; one end of the second working oil channel 13 forms a second working oil port 131, and the other end extends to the mounting hole. The first working oil port 121 and the second working oil port 131 can be used to connect with an actuator. For example, the first working oil port 121 communicates with the rodless cavity of the actuator, and the second working oil port 131 communicates with the rod cavity of the actuator. One end of the return oil channel 14 extends to communicate with the mounting hole, and the other end of the return oil channel 14 forms a return oil port T, which communicates with the fuel tank.

[0048] As a preferred technical solution of this embodiment, a first intermediate oil passage 17 and a second intermediate oil passage 18 are further provided in the valve body 1. The first intermediate oil passage 17 and the second intermediate oil passage 18 are respectively arranged on both sides of the pressure oil passage 11; the oil return passage 14 can be provided in two, and the two oil return passages 14 are located on the two outer sides of the first intermediate oil passage 17 and the second intermediate oil passage 18. The pressure oil passage 11 is communicated with the first working oil passage 12 through the first intermediate oil passage 17; the pressure oil passage 11 is communicated with the second working oil passage 13 through the second intermediate oil passage 18. When the spool 2 is in the middle position, the oil passages are not communicated with each other; when the spool 2 slides to the first working position to the right, the pressure oil introduced by the pressure oil passage 11 can flow through the first intermediate oil passage 17 to the first working oil passage 12, and the second working oil passage 13 is communicated with the oil return passage 14, so as to realize the oil inlet of the first working oil port 121 and the oil return of the second working oil port 131; when the spool 2 slides to the second working position to the left, the pressure oil introduced by the pressure oil passage 11 can flow through the second intermediate oil passage 18 to the second working oil passage 13, and the first working oil passage 12 is communicated with the oil return passage 14, so as to realize the oil return of the first working oil port 121 and the oil inlet of the second working oil port 131.

[0049] When the spool 2 is in the middle position, due to a certain pressure generated by the actuator, the oil will flow towards the spool 2 through the first working oil passage 12, and then leak through the gap between the spool 2 and the valve body 1, and thus the load cannot be maintained. In order to ensure the load holding force, a check valve 3 is provided for the first working oil passage 12. The check valve 3 is inserted into the valve body 1, and the check valve 3 extends into the first working oil passage 12. The check valve 3 includes a check valve spool 31, the check valve spool 31 extends into the first working oil passage 12, and an elastic member 32 is provided at one end of the check valve spool 31 away from the first working oil passage 12. A plug 33 plugs the installation opening on the valve body 1. The two ends of the elastic member 32 act on the check valve spool 31 and the plug 33 respectively, and the cavity where the elastic member 32 is located is the holding cavity 34. In the initial state, under the action of the elastic member 32, the check valve spool 31 can block the first working oil passage 12. At the same time, the oil flowing into the first working oil passage 12 through the first working oil port 121 can enter the holding cavity 34. The sum of the acting force of the oil in the holding cavity 34 and the acting force of the elastic member 32 is greater than the acting force of the oil pressure flowing into the first working oil passage 12 through the first working oil port 121, and the check valve spool 31 will not be opened, and the load of the first working oil port 121 can be maintained; when the pressure oil supplies oil to the first working oil port 121 through the first working oil passage 12, the pressure oil can push the check valve spool 31 to open, so that the pressure oil can enter the actuator through the first working oil port 121; when the first working oil passage 12 returns oil, the oil return of the holding cavity 34 can be controlled, the acting force in the holding cavity 34 is reduced, and the oil flowing into the first working oil passage 12 through the first working oil port 121 can push the check valve spool 31 to open, facilitating the oil return of the first working oil port 121.

[0050] As a preferred technical solution of this embodiment, a third oil passage 311 is formed on the one-way valve spool 31, and the oil fluid entering the first working oil passage 12 through the first working oil port 121 can enter the holding cavity 34 through the third oil passage 311. The elastic member 32 is optional but not limited to a spring.

[0051] As a preferred technical solution of this embodiment, the holding cavity 34 is connected to the spool 2 through a first oil passage 15. One end of the first oil passage 15 is connected to the holding cavity 34, and the other end of the first oil passage 15 extends to the outer peripheral surface of the spool 2 to form a first oil port 151. A second oil passage 16 is further provided in the valve body 1. One end of the second oil passage 16 extends to the outer peripheral surface of the spool 2 to form a second oil port 161, and the other end of the second oil passage 16 is connected to the oil return passage 14. When the spool 2 is in the middle position, the first oil port 151 and the second oil port 161 are blocked by the spool 2 and are not connected. When the spool 2 is in the second working position, the spool 2 controls the connection between the first oil port 151 and the second oil port 161, and the holding cavity 34 is connected to the oil return passage 14 through the first oil passage 15 and the second oil passage 16. The acting force in the holding cavity 34 is reduced, and the one-way valve spool 31 can be opened, and the first working oil passage 12 returns oil. Preferably, one end of the first oil passage 15 is connected to the holding cavity 34, and the other end of the first oil passage 15 is separated to form two first oil ports 151 connected to the spool 2. Preferably, the first oil port 151 and the second oil port 161 are located in the same circumferential direction, the two first oil ports 151 are symmetrically arranged relative to the spool 2, and the second oil port 161 is located between the two first oil ports 151. Specifically, the two first oil ports 151 can be arranged on a straight line passing through the center of the spool 2, the second oil port 161 is located at the circumferential middle of the two first oil ports 151, and the distances from the two first oil ports 151 to the second oil port 161 are the same.

[0052] The spool 2 is in a rod shape, and an internal oil passage 21 is formed on the spool 2. In the initial state, the internal oil passage 21 is axially misaligned with respect to the first oil port 151 and the second oil port 161; when the spool 2 is in the second working position, the first oil port 151 and the second oil port 161 are connected through the internal oil passage 21. The internal oil passage 21 is formed with an oil inlet 211 and an oil outlet 212. The oil inlet 211 is arranged corresponding to the first oil port 151, and the oil outlet 212 is arranged corresponding to the second oil port 161.

[0053] As a preferred technical solution of this embodiment, the oil inlet 211 and the oil outlet 212 of the internal oil passage 21 are located in the same circumferential direction. The oil inlet 211 and the corresponding first oil port 151 are in the same circumferential position but have an axial distance; the oil outlet 212 and the corresponding second oil port 161 are in the same circumferential position but have an axial distance.

[0054] As a preferred technical solution of this embodiment, the internal oil passage 21 is in a T shape, the oil inlet 211 and / or the oil outlet 212 extend axially, and the oil inlet 211 and / or the oil outlet 212 extend in a direction away from the first oil port 151 and the second oil port 161.

[0055] In order to limit the spool 2 to move only axially without rotation, an anti-rotation structure is further provided. The anti-rotation structure includes a positioning ring 7. The positioning ring 7 is sleeved on the spool 2 to prevent the spool 2 from rotating. The positioning ring 7 is in groove-key fit with the spool 2, and the positioning ring 7 is in keyway fit with the valve body 1. In this way, the spool 2 can be prevented from rotating relative to the valve body 1.

[0056] As a preferred technical solution of this embodiment, the positioning ring 7 includes an annular body 71. An inner key 72 extends from the inner circumference of the annular body 71. Correspondingly, a long groove 22 is formed on the spool 2. The inner key 72 can extend into the long groove 22 and slide along the long groove 22. An outer key 73 extends from the outer circumference of the annular body 71. A groove is formed on the inner wall of the mounting hole of the valve body 1. The outer key 73 can extend into the groove of the mounting hole of the valve body 1. The keyway fit between the positioning ring 7 and the valve body 1 can prevent the positioning ring 7 from rotating. The keyway fit between the positioning ring 7 and the spool 2 can limit the spool 2 so that the spool 2 does not rotate but only slides axially.

[0057] As a preferred technical solution of this embodiment, the positioning ring 7 is sleeved on one end of the spool 2, and a retaining ring 8 is embedded in the valve body 1 to block the positioning ring 7. Springs are arranged at both ends of the spool 2. End caps are fixed at both ends of the mounting hole of the valve body 1. Both ends of the spool 2 extend into the end caps. Part of the springs are sleeved on the ends of the spool 2, and spring seats are arranged at both ends of the springs.

[0058] To ensure the normal operation of the multi-way valve, a safety valve is also inserted into the valve body 1. A first safety valve 41 is provided for the first working oil passage 12, and a second safety valve 42 is provided for the second working oil passage 13 to prevent the pressure in the working oil passage from being too high. Once the pressure in the working oil passage exceeds the threshold value, the oil in the working oil passage can be drained to the return oil passage 14 through the corresponding safety valve. In addition, a compensation valve 6 is provided for the pressure oil passage.

[0059] Based on the above structure, when the multi-way valve of this embodiment is in the neutral position, the pressure oil passage 11, the two working oil passages, and the oil return passage 14 are not connected. The oil in the actuator flows into the first working oil passage 12 through the first working oil port 121, and then enters the holding chamber 34 through the third oil passage 311 of the one-way valve 3. The one-way valve 3 closes, providing a load holding force. The oil in the holding chamber 34 can flow to the first oil port 151 through the first oil passage 15. Part of the oil leaks into the second oil passage 16 through the circumferential gap between the valve core 2 and the valve body 1, and finally enters the oil return passage 14. Part of the oil flows through the axial gap between the valve core 2 and the valve body 1 to the oil inlet 211 of the internal oil passage 21 of the valve core 2, enters the internal oil passage 211, and then flows out through the oil outlet 212, and then flows through the axial gap between the valve core 2 and the valve body 1 to the second oil port 161 of the second oil passage 16. In this way, when the oil in the holding chamber 34 leaks axially, the axial path increases, the covering amount increases, the leakage amount decreases, and the load holding effect is good.

[0060] When the valve core 2 slides to the right to the first working position, the pressure oil introduced by the pressure oil passage 11 can flow to the first working oil passage 12 through the first intermediate oil passage 17, and the second working oil passage 13 is connected to the oil return passage 14, thereby realizing oil inlet at the first working oil port 121 and oil return at the second working oil port 131.

[0061] When the valve core 2 slides to the left to the second working position, the pressure oil introduced by the pressure oil passage 11 can flow to the second working oil passage 13 through the second intermediate oil passage 18, and the first working oil passage 12 is connected to the oil return passage 14; at the same time, the oil inlet 211 of the intermediate oil passage 21 is connected to the first oil port 151, and the oil outlet 212 of the intermediate oil passage 21 is connected to the second oil port 161. The oil in the holding chamber 34 flows to the oil return passage 14 through the first oil passage 15, the intermediate oil passage 21, and the second oil passage 16. The acting force in the holding chamber 34 is small, and the one-way valve core 31 of the one-way valve 3 can slide open under the action of the oil pressure at the first working oil port 121, thereby realizing oil return at the first working oil port 121 and oil inlet at the second working oil port 131.

[0062] The above has described in detail the embodiments of the present invention in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A multi-way valve, characterized in that: include: A valve body (1), wherein a pressure oil passage (11), a working oil passage and an oil return oil passage (14) are arranged in the valve body (1); A valve core (2), the valve core (2) being slidably assembled in the valve body (1); A one-way valve (3), the one-way valve (3) being arranged for the working oil passage, the one-way valve (3) comprising a retaining chamber (34); The valve body (1) is further provided with a first oil passage (15) and a second oil passage (16); one end of the first oil passage (15) is connected to the retaining chamber (34); the other end of the first oil passage (15) extends to the outer peripheral surface of the valve core (2) to form a first oil port (151); one end of the second oil passage (16) extends to the outer peripheral surface of the valve core (2) to form a second oil port (161); the other end of the second oil passage (16) is connected to the oil return passage (14); an internal oil passage (21) is provided in the valve core (2); when the valve core (2) is in a neutral position, the internal oil passage (21) and the first oil port (151) and the second oil port (161) are axially misaligned; the axial sliding of the valve core (2) enables the internal oil passage (21) to be connected to the first oil port (151) and the second oil port (161).

2. A multi-way valve according to claim 1, characterized in that: The first oil port (151) and the second oil port (161) are located in the same circumferential direction.

3. A multi-way valve according to claim 2, characterized in that: The number of the first oil ports (151) is two, the two first oil ports (151) are symmetrically arranged relative to the valve core (2), and the second oil port (161) is located in the middle of the two first oil ports (151).

4. A multi-way valve according to any one of claims 1 to 3, characterized in that: The internal oil passage (21) comprises an oil inlet (211) and an oil outlet (212); the oil inlet (211) and the oil outlet (212) are both located on the outer peripheral surface of the valve core (2); the oil inlet (211) is arranged corresponding to the first oil port (151); the oil inlet (211) and the corresponding first oil port (151) are located at the same circumferential position and have an axial spacing therebetween; the oil outlet (212) is arranged corresponding to the second oil port (161); the oil outlet (212) and the corresponding second oil port (161) are located at the same circumferential position and have an axial spacing therebetween.

5. A multi-way valve according to claim 4, characterized in that: The internal oil passage (21) is T-shaped, there are two oil inlets (211), the two oil inlets (211) are located on the same straight line, and the oil outlet (212) is located between the two oil inlets (211).

6. A multi-way valve according to claim 4, characterized in that: The oil inlet (211) and / or the oil outlet (212) extend in the axial direction, and the oil inlet (211) and / or the oil outlet (212) extend in a direction away from the first oil port (151) and the second oil port (161).

7. A multi-way valve according to any one of claims 1-3, 5-6, characterized in that: The valve core (2) is provided with an anti-rotation structure.

8. A multi-way valve according to claim 7, characterized in that: The anti-rotation structure comprises a positioning ring (7), wherein the positioning ring (7) is sleeved on the valve core (2), a keyway between the positioning ring (7) and the valve core (2) is matched, and a keyway between the positioning ring (7) and the valve body (1) is matched.

9. A multi-way valve according to claim 8, characterized in that: The positioning ring (7) is limited by a retaining ring (8), and the retaining ring (8) is assembled on the valve body (1).

10. A multi-way valve according to claim 1, characterized in that: One end of the working oil passage extends to the valve core (2), and the other end of the working oil passage forms a working port. The one-way valve (3) comprises a one-way valve core (31) and an elastic member (32). The elastic member (32) is located in the retaining cavity (34) and acts on the one-way valve core (31). A third oil passage (311) is formed on the valve body (1), and oil entering the working oil passage through the working port can enter the retaining cavity (34) through the third oil passage (311).

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