Working valve plate and multi-way valve

Abstract

This application relates to a working valve plate and a multi-way valve. The working valve plate includes a valve body, a valve rod, a locking structure, and a push rod structure. The locking structure is used to control the on-off of the first oil distribution channel. The valve body is provided with a push rod moving cavity, and the push rod structure is movably arranged in the push rod moving cavity. The locking structure includes a first one-way valve and a second one-way valve. When the first oil distribution channel is connected to the main oil inlet channel, the on-off of the first oil distribution channel is controlled by the first one-way valve. When the first oil distribution channel is connected to the main oil return channel, the on-off of the second oil distribution channel is controlled by the second one-way valve. For the working valve plate and the multi-way valve provided in this application, when there is no pressurized oil in the second oil distribution channel, the push rod structure cannot push the locking structure to open the first oil distribution channel, and the pressurized oil will not flow back to the main oil return channel through the first oil distribution channel, thereby keeping the hydraulic pressure received by the fork rack stable and preventing the fork rack from tilting forward.

Description

Technical Field

[0001] This application relates to the technical field of construction machinery hydraulic components, and particularly to a working valve plate and a multi-way valve. Background Art

[0002] As an industrial handling vehicle, a forklift is indispensable for the development of modern industry. Industrial handling vehicles are widely used in ports, stations, airports, freight yards, factory workshops, warehouses, distribution centers, and other places. Moreover, forklifts can enter the holds, carriages, and containers for pallet cargo loading, unloading, and handling operations, and are essential equipment for pallet transportation and container transportation.

[0003] Generally, a forklift uses a multi-way valve as a power component to control the forward or backward tilt of the fork carriage in front of the forklift. Moreover, the multi-way valve usually includes an inlet valve plate, an outlet valve plate, and multiple working valve plates. Generally, the working valve plate includes a valve body and a valve stem. The valve body is provided with a valve cavity, a main inlet oil passage, a main outlet oil passage, a first branch oil passage, and a second branch oil passage. The main inlet oil passage communicates with the first branch oil passage and the second branch oil passage through the valve cavity, and the main outlet oil passage communicates with the first branch oil passage and the second branch oil passage through the valve cavity. The valve stem is movably arranged in the valve cavity, and the valve stem can control the main inlet oil passage to communicate with the first branch oil passage or the second branch oil passage, and the valve stem can control the main outlet oil passage to communicate with the first branch oil passage or the second branch oil passage.

[0004] Specifically, when the valve stem connects the main inlet oil passage and the second branch oil passage, the first branch oil passage communicates with the main outlet oil passage, thereby forming an oil circuit cycle. Moreover, the fork carriage of the forklift tilts forward to facilitate the forklift to lift heavy objects. Similarly, when the valve stem connects the main inlet oil passage and the first branch oil passage, the second branch oil passage communicates with the main outlet oil passage, thereby forming an oil circuit cycle. Moreover, the fork carriage of the forklift tilts backward to facilitate the heavy object to remain stable on the fork carriage. When the forklift malfunctions and suddenly stalls while the fork carriage of the forklift is holding a heavy object and tilting backward, the main inlet oil passage will no longer continue to input pressurized oil into the second branch oil passage. At this time, the hydraulic pressure received by the fork carriage will suddenly drop, causing the fork carriage to tilt forward, and then causing the heavy object on the fork carriage to slide and resulting in losses. Summary of the Invention

[0005] Based on this, it is necessary to provide a working valve plate and a multi-way valve to solve the problem that the fork carriage of a forklift tilts forward due to sudden stalling.

[0006] The working valve plate provided in the present application includes a valve body, a valve stem, a locking structure and a push rod structure. The valve body is provided with a valve cavity, a main oil inlet channel, a main oil return channel, a first oil distribution channel and a second oil distribution channel. The main oil inlet channel is connected to the first oil distribution channel and the second oil distribution channel through the valve cavity, and the main oil return channel is connected to the first oil distribution channel and the second oil distribution channel through the valve cavity. The valve stem is movably arranged in the valve cavity, the valve stem can control the main oil inlet channel to connect to the first oil distribution channel or the second oil distribution channel, and the valve stem can control the main oil return channel to connect to the first oil distribution channel or the second oil distribution channel. The locking structure is used to control the opening and closing of the first oil distribution channel, and the locking structure includes a first check valve and a second check valve. The valve body is provided with a push rod movable cavity, and the push rod structure is movably arranged in the push rod movable cavity. When the pressure oil flows from the main oil inlet channel to the first oil distribution channel, the first check valve opens the first oil distribution channel, and when the pressure oil flows from the first oil distribution channel to the main oil inlet channel, the first check valve closes the first oil distribution channel. When the pressure oil enters the second oil distribution channel through the main oil inlet channel, the push rod structure can move toward the second one-way valve to push the second one-way valve to open the first oil distribution channel, and the pressure oil can flow back to the main oil return channel through the first oil distribution channel. The working valve plate is provided with a plurality of oil return holes, and the plurality of oil return holes are distributed on the circumference of the second one-way valve along the axial direction of the second one-way valve. The oil return holes are connected to the first oil distribution channel, and when the second one-way valve opens the first oil distribution channel, one or more oil return holes are connected to the first oil distribution channel, and when the second one-way valve closes the first oil distribution channel, the second one-way valve closes the oil return holes. When the pressure oil stops entering the second oil distribution channel, the second one-way valve can close the first oil distribution channel to prevent the pressure oil from flowing back to the main oil return channel through the first oil distribution channel.

[0007] In one embodiment, the first one-way valve includes a first compression spring and a first movable plug connected to one end of the first compression spring, and the first compression spring can push the first movable plug to block the first oil distribution channel. It can be understood that such a configuration is conducive to simplifying the structure of the first one-way valve and reducing the manufacturing cost of the working valve plate.

[0008] In one embodiment, the first movable plug is provided with a built-in movable cavity, a plurality of oil return holes are provided in the first movable plug, and the plurality of oil return holes are distributed along the length direction of the built-in movable cavity, the built-in movable cavity is connected to the first oil distribution channel through the oil return hole, and the second one-way valve is movably provided in the built-in movable cavity to separate or connect the built-in movable cavity and the oil return hole. It can be understood that such a setting is conducive to reducing the difficulty of setting the first one-way valve and the second one-way valve.

[0009] In one embodiment, the second one-way valve includes a second compression spring and a second movable plug connected to one end of the second compression spring. The second compression spring can push the second movable plug to block the built-in movable cavity. It can be understood that such a setting is beneficial to simplifying the structure of the second one-way valve and reducing the manufacturing cost of the working valve plate.

[0010] In one embodiment, the elastic coefficient of the second compression spring is greater than that of the first compression spring.

[0011] In one embodiment, a thrust portion is provided at one end of the second movable plug facing the push rod structure. The outer diameter of the thrust portion is smaller than the outer diameter of the second movable plug. The push rod structure abuts against the second movable plug through the thrust portion. It can be understood that such a setting is beneficial to reducing the contact area between the second movable plug and the inner wall of the built-in movable cavity, thereby reducing the moving resistance of the second one-way valve.

[0012] In one embodiment, a plurality of oil return holes are arranged at intervals along the length direction of the built-in movable cavity.

[0013] It can be understood that such a setting is beneficial to reducing the processing difficulty of the oil return holes.

[0014] In one embodiment, a plurality of oil return holes are distributed circumferentially along the built-in movable cavity.

[0015] In one embodiment, the inner diameters of the plurality of oil return holes gradually increase from the direction close to the push rod structure to the direction away from the push rod structure, or the inner diameters of the plurality of oil return holes gradually decrease from the direction close to the push rod structure to the direction away from the push rod structure.

[0016] The present application also provides a multi-way valve, which includes the working valve plate described in any one of the above embodiments.

[0017] Compared with the prior art, for the working valve plate and the multi-way valve provided by the present application, when there is pressure oil in the second oil distribution channel, the push rod structure can push the second one-way valve to open the first oil distribution channel, so that a complete circulating oil path is formed in the working valve plate. When there is no pressure oil in the second oil distribution channel, the push rod structure cannot push the second one-way valve to open the first oil distribution channel, and the pressure oil will not flow back to the main oil return channel through the first oil distribution channel, thereby keeping the hydraulic pressure received by the fork rack stable and preventing the fork rack from tilting forward. Moreover, the locking structure includes a first one-way valve and a second one-way valve. When the first oil distribution channel is connected to the main oil inlet channel, the on-off of the first oil distribution channel is controlled by the first one-way valve. When the first oil distribution channel is connected to the main oil return channel, the on-off of the second oil distribution channel is controlled by the second one-way valve. In this way, when one of the first one-way valve and the second one-way valve fails, it will not affect the normal operation of the other, greatly improving the fault tolerance rate of the locking structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a cross-sectional view of the working valve plate provided by the present application;

[0020] Figure 2 It is a pipeline diagram of the working valve plate provided by the present application.

[0021] Reference numerals: 100, valve body; 110, valve cavity; 120, main oil inlet passage; 130, main oil return passage; 131, first oil return passage; 132, second oil return passage; 140, first oil distribution passage; 150, second oil distribution passage; 160, push rod moving cavity; 170, hydraulic cavity; 200, valve rod; 300, locking structure; 310, first one-way valve; 311, first compression spring; 312, first movable plug; 313, built-in movable cavity; 314, oil return hole; 320, second one-way valve; 321, second compression spring; 322, second movable plug; 323, abutting portion; 400, push rod structure. Detailed implementation manners

[0022] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0023] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0024] In this application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0026] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific implementations and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] As an industrial handling vehicle, the forklift is indispensable for the development of modern industry. Industrial handling vehicles are widely used in ports, stations, airports, freight yards, factory workshops, warehouses, distribution centers and other places. Moreover, forklifts can enter the cabins, carriages and containers to carry out the loading, unloading and handling operations of pallet goods, and are essential equipment for pallet transportation and container transportation.

[0029] Generally, a forklift uses a multi-way valve as a power element to control the forward or backward tilt of the fork carriage in front of the forklift. And, the multi-way valve generally includes an inlet valve plate, an outlet valve plate and a plurality of working valve plates. Generally, the working valve plate includes a valve body 100 and a valve stem 200. The valve body 100 is provided with a valve cavity 110, a main inlet oil passage 120, a main outlet oil passage 130, a first oil distribution passage 140 and a second oil distribution passage 150. The main inlet oil passage 120 communicates with the first oil distribution passage 140 and the second oil distribution passage 150 through the valve cavity 110. The main outlet oil passage 130 communicates with the first oil distribution passage 140 and the second oil distribution passage 150 through the valve cavity 110. The valve stem 200 is movably arranged in the valve cavity 110. The valve stem 200 can control the main inlet oil passage 120 to communicate with the first oil distribution passage 140 or the second oil distribution passage 150, and the valve stem 200 can control the main outlet oil passage 130 to communicate with the first oil distribution passage 140 or the second oil distribution passage 150.

[0030] Specifically, when the valve stem 200 connects the main inlet oil passage 120 and the second oil distribution passage 150, the first oil distribution passage 140 communicates with the main outlet oil passage 130, thereby forming an oil circuit cycle. And, the fork carriage of the forklift tilts forward to facilitate the forklift to lift heavy objects. Similarly, when the valve stem 200 connects the main inlet oil passage 120 and the first oil distribution passage 140, the second oil distribution passage 150 communicates with the main outlet oil passage 130, thereby forming an oil circuit cycle. And, the fork carriage of the forklift tilts backward to facilitate the heavy object to remain stable on the fork carriage. When the forklift breaks down and suddenly stalls while the fork carriage of the forklift is holding a heavy object in a backward-tilted state, the main inlet oil passage 120 will not continue to input pressure oil into the second oil distribution passage 150. At this time, the hydraulic pressure on the fork carriage will suddenly drop, resulting in the forward tilt of the fork carriage, and further causing the heavy object on the fork carriage to slide and cause losses. It should be noted that, in this embodiment, the main outlet oil passage 130 includes a first outlet oil passage 131 and a second outlet oil passage 132. Generally, when the first oil distribution passage 140 returns oil, it communicates with the first outlet oil passage 131, and when the second oil distribution passage 150 returns oil, it communicates with the second outlet oil passage 132. However, it is not limited thereto. The main outlet oil passage 130 may also include other numbers of outlet oil passages, which will not be listed one by one here.

[0031] Please refer to Figure 1 and Figure 2, to solve the problem that the forklift suddenly stalls and causes the fork rack to tilt forward, the working valve plate provided by this application further includes a locking structure 300 and a push rod structure 400. The locking structure 300 is used to control the on-off of the first oil distribution channel 140. Specifically, the locking structure 300 includes a first one-way valve 310 and a second one-way valve 320. The valve body 100 is provided with a push rod moving cavity 160, and the push rod structure 400 is movably arranged in the push rod moving cavity 160. When the pressure oil flows from the main oil inlet channel 120 towards the first oil distribution channel 140, the first one-way valve 310 opens the first oil distribution channel 140. When the pressure oil flows from the first oil distribution channel 140 towards the main oil inlet channel 120, the first one-way valve 310 closes the first oil distribution channel 140. When the pressure oil enters the second oil distribution channel 150 through the main oil inlet channel 120, the push rod structure 400 can move towards the second one-way valve 320 to push the second one-way valve 320 to open the first oil distribution channel 140, and the pressure oil can flow back to the main oil return channel 130 through the first oil distribution channel 140. In this way, a complete circulating oil circuit is formed. When the pressure oil stops entering the second oil distribution channel 150, the second one-way valve 320 can close the first oil distribution channel 140 to prevent the pressure oil from flowing back to the main oil return channel 130 through the first oil distribution channel 140.

[0032] In this way, when there is pressure oil in the second oil distribution channel 150, the push rod structure 400 can push the second one-way valve 320 to open the first oil distribution channel 140, so that the working valve plate forms a complete circulating oil circuit. When there is no pressure oil in the second oil distribution channel 150, the push rod structure 400 cannot push the second one-way valve 320 to open the first oil distribution channel 140, and the pressure oil will not flow back to the main oil return channel 130 through the first oil distribution channel 140, thereby keeping the hydraulic pressure on the fork rack stable and preventing the fork rack from tilting forward. And, the locking structure 300 includes a first one-way valve 310 and a second one-way valve 320. When the first oil distribution channel 140 is connected to the main oil inlet channel 120, the on-off of the first oil distribution channel 140 is controlled by the first one-way valve 310. When the first oil distribution channel 140 is connected to the main oil return channel 130, the on-off of the second oil distribution channel 150 is controlled by the second one-way valve 320. In this way, when one of the first one-way valve 310 and the second one-way valve 320 fails, it will not affect the normal operation of the other, greatly improving the fault tolerance rate of the locking structure 300.

[0033] Further, when the pressure oil enters the second oil distribution channel 150 through the main oil inlet channel 120, and the push rod structure 400 moves towards the second one-way valve 320 and pushes the second one-way valve 320 to open the first oil distribution channel 140, in order to improve the control accuracy of the oil return amount of the working valve plate for the pressure oil, in one embodiment, such as Figure 1 and Figure 2As shown, the working valve plate is provided with a plurality of oil return holes 314. The plurality of oil return holes 314 are distributed along the axial direction of the second one-way valve 320 on the circumferential side of the second one-way valve 320. The oil return holes 314 communicate with the first oil distribution channel 140. And when the second one-way valve 320 opens the first oil distribution channel 140, one or more oil return holes 314 communicate with the first oil distribution channel 140. When the second one-way valve 320 closes the first oil distribution channel 140, the second one-way valve 320 closes the oil return holes 314. Thus, during the movement of the second one-way valve 320, by controlling the moving distance of the second one-way valve 320, the number of oil return holes 314 opened by the second one-way valve 320 is further controlled, thereby realizing the control of the oil return amount of the working valve plate. It should be noted that in this embodiment, when one end opening of the oil return hole 314 is blocked by the second one-way valve 320, the oil return hole 314 is closed. When one end opening of the oil return hole 314 is not blocked by the second one-way valve 320, the oil return hole 314 is opened.

[0034] Furthermore, in one embodiment, as Figure 1 and Figure 2 shown, the valve body 100 is provided with a hydraulic cavity 170. The pressure oil can enter the hydraulic cavity 170 from the second oil distribution channel 150, so that the push rod structure 400 moves towards the direction close to the locking structure 300. The pressure oil can enter the second oil distribution channel 150 from the hydraulic cavity 170, so that the push rod structure 400 moves towards the direction away from the locking structure 300. Thus, when the pressure oil passes through the second oil distribution channel 150, the pressure oil directly enters the hydraulic cavity 170 from the second oil distribution channel 150, and then pushes the push rod structure 400 to push open the locking structure 300. When the locking structure 300 closes the first oil distribution channel 140 and pushes the push rod structure 400 to reset, the pressure oil in the hydraulic cavity 170 can enter the second oil distribution channel 150, so that the push rod structure 400 can be reset smoothly. In summary, with such a setting, the control efficiency of the pressure oil on the push rod structure 400 is greatly improved.

[0035] In order to simplify the structure of the first one-way valve 310 and reduce the manufacturing cost of the working valve plate, in one embodiment, as Figure 1 and Figure 2 shown, the first one-way valve 310 includes a first compression spring 311 and a first movable plug 312 connected to one end of the first compression spring 311. The first compression spring 311 can push the first movable plug 312 to block the first oil distribution channel 140. However, it is not limited to this. The first one-way valve 310 can also be a one-way opening rotary valve. Further, in one embodiment, in order to improve the sealing performance of the first movable plug 312, the first movable plug 312 is a conical plug. The conical plug is simple to manufacture and has a better sealing effect, which is beneficial to improving the control accuracy of the working valve plate.

[0036] Further, in order to reduce the difficulty of setting the first one-way valve 310 and the second one-way valve 320, in one embodiment, as Figure 1 and Figure 2 shown, the first movable plug 312 is provided with an internal movable cavity 313, and a plurality of oil return holes 314 are arranged on the first movable plug 312, and the plurality of oil return holes 314 are distributed along the length direction of the internal movable cavity 313. The internal movable cavity 313 is communicated with the first oil distribution channel 140 through the oil return holes 314, and the second one-way valve 320 is movably arranged in the internal movable cavity 313 to cut off or communicate the internal movable cavity 313 and the oil return holes 314. In this way, the first one-way valve 310 and the second one-way valve 320 are sleeved, which greatly reduces the processing difficulty of the working valve plate. Moreover, since the plurality of oil return holes 314 are arranged on the first movable plug 312, when the second one-way valve 320 moves in the internal movable cavity 313, the number of the oil return holes 314 opened and closed can be directly and effectively controlled.

[0037] It should be noted that when the first one-way valve 310 opens or closes the first oil distribution channel 140, it synchronously drives the second one-way valve 320 to move together. When the second one-way valve 320 opens or closes the first oil distribution channel 140, the first one-way valve 310 is always in the state of closing the first oil distribution channel 140, that is, the pressure oil can only flow in the internal movable cavity 313 where the second one-way valve 320 is provided. However, this is not limited thereto. In other embodiments, the first one-way valve 310 and the second one-way valve 320 may also be relatively independently arranged. Specifically, when the first oil distribution channel 140 has two parallel branches, at this time, the first one-way valve 310 and the second one-way valve 320 are respectively arranged on different branches, and when the first one-way valve 310 is in the working state, the second one-way valve 320 is in the closed state, and when the second one-way valve 320 is in the working state, the first one-way valve 310 is in the closed state. When the first oil distribution channel 140 has only one passage, the first one-way valve 310 and the second one-way valve 320 are respectively arranged at different positions of the first oil distribution channel 140, and when the first one-way valve 310 is in the working state, the second one-way valve 320 remains in the communicating state, and when the second one-way valve 320 is in the working state, the first one-way valve 310 remains in the communicating state.

[0038] In order to simplify the structure of the second one-way valve 320 and reduce the manufacturing cost of the working valve plate, in one embodiment, as Figure 1 and Figure 2As shown, the second one-way valve 320 includes a second compression spring 321 and a second movable plug 322 connected to one end of the second compression spring 321. The second compression spring 321 can push the second movable plug 322 to block the built-in movable cavity 313. However, it is not limited to this. The second one-way valve 320 can also be a rotatable valve that opens unidirectionally. Further, in one embodiment, to improve the sealing performance of the second movable plug 322, the second movable plug 322 is a conical plug. The conical plug is simple to manufacture and has a better sealing effect, which is beneficial to improving the control accuracy of the working valve plate.

[0039] Generally, the pressure of the pressure oil entering the first oil distribution channel 140 on the first one-way valve 310 is less than the thrust of the push rod structure 400 on the second one-way valve 320. Therefore, in one embodiment, to reduce the difficulty of the pressure oil opening the first one-way valve 310 and improve the working efficiency of the working valve plate, the elastic coefficient of the second compression spring 321 is greater than that of the first compression spring 311.

[0040] To reduce the contact area between the second movable plug 322 and the inner wall of the built-in movable cavity 313, and thus reduce the movement resistance of the second one-way valve 320, in one embodiment, as Figure 1 and Figure 2 shown, a thrust portion 323 is provided at one end of the second movable plug 322 facing the push rod structure 400. The outer diameter of the thrust portion 323 is smaller than the outer diameter of the second movable plug 322, and the push rod structure 400 abuts against the second movable plug 322 through the thrust portion 323.

[0041] To reduce the processing difficulty of the oil return hole 314, in one embodiment, as Figure 1 and Figure 2 shown, a plurality of oil return holes 314 are arranged at intervals along the length direction of the built-in movable cavity 313. It should be noted that the adjacent oil return holes 314 can be arranged at the same or different intervals. Further, a plurality of oil return holes 314 are evenly arranged at intervals along the length direction of the built-in movable cavity 313.

[0042] To improve the oil return efficiency of the oil return hole 314, in one embodiment, a plurality of oil return holes 314 are circumferentially distributed along the built-in movable cavity 313. Since a plurality of oil return holes 314 are distributed along the length direction of the built-in movable cavity 313, a plurality of oil return holes 314 are spirally distributed on the inner wall of the built-in movable cavity 313.

[0043] In order to achieve an accelerated increase in the oil return volume, in one embodiment, the inner diameters of the plurality of oil return holes 314 gradually increase in the direction from near the push rod structure 400 to away from the push rod structure 400. In order to achieve a decelerated increase in the oil return volume, in one embodiment, the inner diameters of the plurality of oil return holes 314 gradually decrease in the direction from near the push rod structure 400 to away from the push rod structure 400.

[0044] The present application also provides a multi-way valve, which includes the working valve plate described in any one of the above embodiments.

[0045] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0046] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A working valve plate, characterized in that, It includes a valve body (100), a valve stem (200), a locking structure (300) and a push rod structure (400). The valve body (100) is provided with a valve cavity (110), a main oil inlet passage (120), a main oil return passage (130), a first oil distribution passage (140) and a second oil distribution passage (150). The main oil inlet passage (120) communicates with the first oil distribution passage (140) and the second oil distribution passage (150) through the valve cavity (110). The main oil return passage (130) communicates with the first oil distribution passage (140) and the second oil distribution passage (150) through the valve cavity (110). The valve stem (200) is movably arranged in the valve cavity (110). The valve stem (200) can control the main oil inlet passage (120) to communicate with the first oil distribution passage (140) or the second oil distribution passage (150), and the valve stem (200) can control the main oil return passage (130) to communicate with the first oil distribution passage (140) or the second oil distribution passage (150). The locking structure (300) is used to control the on-off of the first oil distribution passage (140). The locking structure (300) includes a first one-way valve (310) and a second one-way valve (320). The valve body (100) is provided with a push rod moving cavity (160). The push rod structure (400) is movably arranged in the push rod moving cavity (160). When the pressure oil flows from the main oil inlet passage (120) towards the first oil distribution passage (140), the first one-way valve (310) opens the first oil distribution passage (140). When the pressure oil flows from the first oil distribution passage (140) towards the main oil inlet passage (120), the first one-way valve (310) closes the first oil distribution passage (140). When the pressure oil enters the second oil distribution passage (150) through the main oil inlet passage (120), the push rod structure (400) can move towards the second one-way valve (320) to push the second one-way valve (320) to open the first oil distribution passage (140). And the pressure oil can flow back to the main oil return passage (130) through the first oil distribution passage (140). The working valve plate is provided with a plurality of oil return holes (314). The plurality of oil return holes (314) are distributed along the axial direction of the second one-way valve (320) on the periphery of the second one-way valve (320). The oil return holes (314) communicate with the first oil distribution passage (140). When the second one-way valve (320) opens the first oil distribution passage (140), one or more of the oil return holes (314) communicate with the first oil distribution passage (140). When the second one-way valve (320) closes the first oil distribution passage (140), the second one-way valve (320) closes the oil return holes (314). When the pressure oil stops entering the second oil distribution channel (150), the second one-way valve (320) can close the first oil distribution channel (140) to prevent the pressure oil from flowing back to the main oil return channel (130) through the first oil distribution channel (140).

2. The working valve plate according to claim 1, characterized in that, The first one-way valve (310) includes a first compression spring (311) and a first movable plug (312) connected to one end of the first compression spring (311), and the first compression spring (311) can push the first movable plug (312) to block the first oil distribution channel (140).

3. The working valve plate according to claim 2, wherein, The first movable plug (312) is provided with an internal movable cavity (313), and a plurality of the oil return holes (314) are arranged on the first movable plug (312), and the plurality of the oil return holes (314) are distributed along the length direction of the internal movable cavity (313). The internal movable cavity (313) communicates with the first oil distribution channel (140) through the oil return holes (314), and the second one-way valve (320) is movably arranged in the internal movable cavity (313) to cut off or communicate the internal movable cavity (313) and the oil return holes (314).

4. The working valve plate according to claim 3, characterized in that, The second one-way valve (320) includes a second compression spring (321) and a second movable plug (322) connected to one end of the second compression spring (321), and the second compression spring (321) can push the second movable plug (322) to block the internal movable cavity (313).

5. The working valve plate according to claim 4, characterized in that, The elastic coefficient of the second compression spring (321) is greater than that of the first compression spring (311).

6. The working valve plate according to claim 4, characterized in that, One end of the second movable plug (322) facing the push rod structure (400) is provided with a pushing portion (323), the outer diameter of the pushing portion (323) is smaller than the outer diameter of the second movable plug (322), and the push rod structure (400) abuts against the second movable plug (322) through the pushing portion (323).

7. The working valve plate according to claim 3, characterized in that, The plurality of the oil return holes (314) are arranged at intervals along the length direction of the internal movable cavity (313).

8. The working valve plate according to claim 3, wherein, The plurality of the oil return holes (314) are circumferentially distributed along the internal movable cavity (313).

9. The working valve plate according to claim 3, characterized in that, The inner diameters of the plurality of the oil return holes (314) gradually increase from the direction close to the push rod structure (400) to the direction away from the push rod structure (400), or the inner diameters of the plurality of the oil return holes (314) gradually decrease from the direction close to the push rod structure (400) to the direction away from the push rod structure (400).

10. A multi-way valve, characterized in that, Including the working valve plate according to any one of claims 1-9.

Images