Bidirectional self-control oil return valve structure

Abstract

The utility model discloses a two -way self -control oil return valve structure, including the valve body and the oil return valve core of being located in its, be equipped with two sections intercommunication passageway, the jack of connecting both and a plurality of oil channels, and oil return valve core can move in the jack under the hydraulic pressure effect, have two working positions, control the on -off of different oil channel respectively, realize the switching of oil circuit and oil return function. The utility model structure sets the function that changes, seals and throttling in one, can replace traditional bypass loop or direct overflow mode, is applicable to small flow condition, and has compact structure, control sensitive, easy maintenance and the advantages such as.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control valves, and in particular to a bidirectional self-controlled return valve structure. Background Technology

[0002] In equipment and actuators, bidirectional power units are often used to control the mechanism. That is, by using the forward and reverse rotation of the motor, the inlet and outlet of the oil circuit are reversed to achieve the required functions, such as extension, lifting and other actions.

[0003] However, traditional double-acting hydraulic power units typically use directional valves (such as solenoid directional valves or manual directional valves) to control the extension and retraction of the cylinder. This approach has some inherent drawbacks: First, it requires additional control signals or manual operation to drive the directional valve, resulting in a complex system configuration and higher costs; second, during the cylinder's return stroke, the volume of oil discharged from the rodless chamber is greater than the volume required by the rod chamber, generating excess oil. This excess oil usually needs to be processed through a complex circuit or may impact the system.

[0004] Therefore, a technical solution is needed to overcome the above problems. Utility Model Content

[0005] In order to overcome some shortcomings in the existing technology, the purpose of this utility model is to provide a bidirectional self-controlled oil return valve structure to solve the above-mentioned technical problems.

[0006] To achieve its purpose, the present invention adopts the following technical solution: a bidirectional self-regulating oil return valve structure, comprising: The valve body has an internal connecting channel, a socket, and multiple oil passages. The connecting channel has two sections, which are connected by the socket. The multiple oil passages are respectively connected to the two sections of the connecting channel and the socket. A return valve core is disposed in the valve body, and the return valve core can move between a first working position and a second working position in the socket under oil pressure; When the return valve core is in the first working position, the return valve core blocks one section of the connecting channel from communicating with the socket, and blocks the oil passage connected to that section of the connecting channel from communicating with other oil passages. When the return valve core is in the second working position, the return valve core blocks the connection between the other section of the connecting channel and the socket, and blocks the oil passage connected to this section of the connecting channel from connecting with other oil passages.

[0007] In some embodiments, the return valve core includes a connecting rod and two sealing heads disposed at both ends of the connecting rod. The cross-sectional dimension of the sealing head is larger than the diameter of the insertion hole. The connecting rod is movably installed in the insertion hole, and when the connecting rod moves, the sealing heads at both ends of the connecting rod can block the ends of the insertion hole.

[0008] In some embodiments, the sealing head and the connecting rod are detachably connected.

[0009] In some embodiments, the sealing head is provided with a first sealing surface, the insertion hole is provided with a second sealing surface, and a throttling annular gap can be formed between the first sealing surface and the second sealing surface; When the return valve core moves in the insertion hole, the first sealing surface can abut against the second sealing surface to form a seal.

[0010] In some embodiments, the first sealing surface is a tapered surface disposed on the sealing head, and the second sealing surface is a tapered concave surface disposed at the end of the insertion hole.

[0011] In some embodiments, the plurality of oil passages include a first oil passage connecting one segment of the connecting channel, a second oil passage connecting another segment of the connecting channel, and a third oil passage connecting the socket; When the return valve core is in the first working position, the return valve core blocks the connection between the first oil passage and the third oil passage, and at the same time opens the connection between the second oil passage and the third oil passage. When the return valve core is in the second working position, the return valve core blocks the connection between the second oil passage and the third oil passage, and at the same time opens the connection between the first oil passage and the third oil passage.

[0012] In some embodiments, the third oil passage connects from the side to the middle of the socket.

[0013] In some embodiments, the valve body is further provided with an elastic element that keeps the return valve core centered.

[0014] In some embodiments, the elastic element is two springs, respectively disposed at both ends of the insertion hole and abutting against both ends of the return valve core.

[0015] In some embodiments, the valve body is provided with a plug for opening the two sections of the connecting passage. The bidirectional self-controlled return oil valve structure of this utility model does not require an external control signal and can automatically complete the oil circuit switching by relying solely on the inlet oil pressure, which simplifies the system configuration and reduces costs.

[0016] The bidirectional self-controlled return valve structure of this utility model generates a throttling effect through a unique annular gap throttling design, which helps to quickly build up pressure on the oil inlet side and drive the valve core to move, so that the valve can reliably switch directions even under extremely low flow conditions (as low as 0.4L / min).

[0017] The bidirectional self-controlled return oil valve structure of this utility model adopts a sealing method in which the sealing head and the valve body sealing surface directly abut against each other, which ensures reliable sealing, small internal leakage, and ensures rapid establishment of system pressure and rapid response of valve core.

[0018] The bidirectional self-controlled oil return valve structure of this utility model is equipped with a third oil passage for connecting to the oil tank. When the oil cylinder returns, it can automatically guide the excess oil discharged from the oil cylinder back to the oil tank, thus avoiding abnormal pressure rise and impact in the system.

[0019] The bidirectional self-controlled return valve structure of this utility model allows key components such as the valve core and spring to be removed from both ends of the valve body, facilitating processing, assembly, cleaning, and maintenance, and reducing life cycle costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a power unit in the prior art; Figure 2 This is a schematic diagram of the structure of a dual-action power unit in this utility model; Figure 3 This is a front view of the bidirectional self-controlled return oil valve structure in this utility model; Figure 4 This is a left view of the bidirectional self-controlled return oil valve structure in this utility model; Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure cut along the AA direction; Figure 6 for Figure 5 A magnified structural diagram of position B in the middle; Figure 7 This is a partial structural diagram of the return oil valve core moving to the right within the valve body under the pressure of the liquid oil in this utility model. Figure 8 This is a partial structural diagram of the return oil valve core moving to the left within the valve body under the pressure of the liquid oil in this invention. Figure 9 This is a schematic diagram of the return oil valve core in this utility model. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the above description, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] Figure 5 This is a structural schematic diagram of a bidirectional self-controlled oil return valve according to the present invention.

[0028] like Figures 2 to 9 As shown, a dual-acting power unit can be externally connected to a hydraulic cylinder 10 to control the output of the hydraulic cylinder 10. It includes a bidirectional self-controlled return valve structure 9, a hydraulic lock 8, a motor 2, a hydraulic pump 3, a first filter screen 6, a second filter screen 7, and an oil tank 1. The oil tank 1, hydraulic pump 3, first filter screen 6, hydraulic lock 8, and the bottom of the hydraulic cylinder 10 are connected sequentially to form a first control oil circuit. The oil tank 1, hydraulic pump 3, second filter screen 7, hydraulic lock 8, and the top of the oil tank 1 are connected sequentially to form a second control oil circuit. The motor 2 is connected to the hydraulic pump 3 and can control the hydraulic pump 3 to draw oil from the oil tank 1. The bidirectional self-controlled return valve structure 9 is connected in parallel to the inlet and outlet of the hydraulic pump 3. Through the first and second control oil circuits, it is used to control the output and input power of the hydraulic cylinder 10, respectively. The bidirectional self-controlled return valve structure 9 integrates reversing, sealing, and throttling functions, and is connected to the inlet and outlet of the hydraulic pump 3, replacing the traditional method of adding a bypass circuit or direct overflow.

[0029] The double-acting power unit also includes a check valve. The hydraulic pump 3 is connected to the oil tank 1 through the check valve to prevent backflow of hydraulic oil. Specifically, there are two check valves: a first check valve 4 and a second check valve 5. The inlet and outlet of the hydraulic pump 3 are connected to the oil tank 1 through the first check valve 4 and the second check valve 5, respectively. When the motor 2 rotates forward, the hydraulic pump 3 draws oil from the oil tank 1 through the first check valve 4. When the motor 2 rotates in reverse, the hydraulic pump 3 draws oil from the oil tank 1 through the second check valve 5.

[0030] The hydraulic lock 8 can reliably lock the actuator (such as the cylinder 10) in a fixed position when the double-acting power unit stops supplying pressure, preventing it from moving accidentally due to external forces. Specifically, the hydraulic lock 8 includes two sets of pilot-operated check valves, namely a third check valve 81 and a fourth check valve 82. The third check valve 81 is connected to the bottom of the cylinder 10, and the fourth check valve is connected to the top of the cylinder 10. Through the third check valve 81 and the fourth check valve 82, the cylinder 10 is kept in a fixed position when there is no external hydraulic oil. When hydraulic oil flows from the first control oil circuit, the hydraulic oil opens the third check valve 81 by its own pressure and outputs to the bottom of the oil tank 10, causing the cylinder 10 to rise. The fourth check valve 82 is opened by the hydraulic oil in the first control oil circuit, allowing the hydraulic oil at the top of the cylinder 10 to be output. Similarly, when hydraulic oil flows from the second control oil circuit, the hydraulic oil opens the fourth check valve 82 by its own pressure and outputs to the top of the oil tank 10, causing the cylinder 10 to fall. The third check valve 81 is opened by the hydraulic oil in the first control oil circuit, allowing the hydraulic oil at the bottom of the cylinder 10 to be output.

[0031] Among them, see Figures 3 to 9 The bidirectional self-controlled return oil valve structure 9 includes a valve body 91 and a return oil valve core 92 disposed in the valve body 91. The valve body 91 is provided with a connecting channel 94 and multiple oil passages. The oil passages are connected to the first control oil circuit, the second control oil circuit or the oil tank 1. The return oil valve core 92 is installed in the connecting channel 94 and can move within the connecting channel 94 to control the connection between different oil passages.

[0032] Preferably, the connecting channel 94 is provided in two sections, and the two sections of the connecting channel 94 are connected by the socket 93. The return valve core 92 is installed in the socket 93 and can move within the socket 93. When the return valve core 92 is installed in the socket 93, the two ends of the return valve core 92 are provided with sealing heads 922 located in the connecting channels 94 on both sides. When the return valve core 92 moves, the sealing head 922 can block one end of the socket 93, so that the connecting channel 94 at that end is sealed and not connected with the socket 93, thereby controlling the connection or closure between the oil passages.

[0033] Specifically, in this embodiment, the valve body 91 has a generally rectangular parallelepiped structure, such as a valve block forged and precision machined from aluminum alloy. Internal drilling and reaming form oil passages. The insertion hole 93 is a cylindrical insertion hole horizontally arranged within the valve body 91. The connecting channel 94 is horizontally arranged on both the left and right sides of the insertion hole 93, meaning the two connecting channels 94 within the valve body 91 are mirror-symmetrical in shape, with the insertion hole 93 located in the middle of the two connecting channels 94. The valve body 91 has two oil passages: a first oil passage 95 located to the left of the insertion hole 93 and a second oil passage 96 located to the right of the insertion hole 93. Both oil passages have inlet and outlet holes on the side of the valve body 91, allowing oil to enter and exit within the valve body 91. The two oil passages are connected to the two connecting channels 94 respectively. When the two connecting channels 94 are connected via the insertion hole 93, the two oil passages can also be connected. The return valve core 92 moves within the insertion hole 93, opening or closing the insertion hole 93 to connect or close the two oil passages.

[0034] Preferably, the first oil passage 95 is connected between the outlet of the hydraulic pump 3 and the inlet of the first filter screen 6 in the first control oil circuit, and the second oil passage 96 is connected between the inlet of the hydraulic pump 3 and the inlet of the second filter screen 7 in the second control oil circuit. That is, the bidirectional self-controlled return valve structure 9 is used to connect the outlet and inlet of the hydraulic pump 3.

[0035] Preferably, both oil passages are connected to the connecting channel 94 from the side. Specifically, in this embodiment, both the first oil passage 95 and the second oil passage 96 are provided with inlet holes on the front side of the valve body 91.

[0036] Preferably, the return valve core 92 further includes a connecting rod 921, and two sealing heads 922 are provided. The two sealing heads 922 are respectively connected to the two ends of the connecting rod 921, so that when the return valve core 92 is installed in the insertion hole 93, the connecting rod 921 moves within the insertion hole 93, and the sealing heads 922 connected to its two ends are respectively located in the connecting channels 94 on both sides of the insertion hole 93. The size of the sealing head 922 is larger than the size of the insertion hole 93, so that when the connecting rod 921 moves within the insertion hole 93, the sealing head 922 connected to its end can block the end of the insertion hole 93 to form a seal. Specifically, in this embodiment, the size of the connecting rod 921 is slightly smaller than the size of the insertion hole 93, so that the connecting rod 921 can move within the insertion hole 93, and the two ends of the connecting rod 921 are respectively connected to two hexagonal prism-shaped sealing heads 922. The size of the sealing head 922 is much larger than the size of the insertion hole 93, so that the sealing head 922 can block the insertion hole 93.

[0037] Preferably, the two sealing heads 922 are detachably mounted at both ends of the connecting rod 921. Specifically, in this embodiment, one of the sealing head 922 and the connecting rod 921 has an internal thread, and the other has an external thread. The sealing head 922 and the connecting rod 921 are detachably connected by threaded engagement. Alternatively, in some other embodiments, the sealing head 922 and the connecting rod 921 can also be detachably connected by other methods such as fitting or snap-fit ​​connection.

[0038] The valve body 91 also includes a third oil passage 97, which connects to the insertion hole 93. By moving the return valve core 92, the two oil passages can connect to or not connect to the insertion hole 93, allowing the first oil passage 95 and the second oil passage 96 to connect or not connect with the third oil passage 97. Specifically, in this embodiment, the third oil passage 97 connects from the side of the insertion hole 93 into the insertion hole 93, and is located at the middle of the insertion hole 93 along its length. This ensures that the distance between the oil passages on both sides of the third oil passage 97 is the same, resulting in a consistent oil path and reducing deviation.

[0039] Preferably, the third oil passage 97 is connected to the oil tank 1, which can return excess liquid oil to the oil tank 1.

[0040] The return valve core 92 is also provided with a first sealing surface 9221, and the insertion hole 93 is provided with a second sealing surface 931. When the return valve core 92 moves within the insertion hole 93, the first sealing surface 9221 and the second sealing surface 931 abut against each other, ensuring good sealing between the return valve core 92 and the insertion hole 93 and guaranteeing control accuracy. Specifically, in this embodiment, the first sealing surface 9221 is a first inclined surface provided on the sealing head 922 of the return valve core 92. The first inclined surface is provided at one end of the sealing head 922 near the insertion hole 93, that is, a conical surface is provided on the side of the sealing head 922 near the insertion hole 93. The second sealing surface 931 is a second inclined surface provided at both ends of the insertion hole 93, that is, a conical concave surface is provided at both ends of the insertion hole 93. During the movement of the return valve core 92, the first sealing surface 9221 and the second sealing surface 931 fit together to form a seal, ensuring good sealing performance of the first sealing surface 9221 and the second sealing surface 931 under oil pressure.

[0041] Preferably, between the valve body 91 and the return valve core 92, since the first sealing surface 9221 is the first inclined surface on the sealing head 922 and the second sealing surface 931 is the second inclined surface provided at both ends of the insertion hole 93, when the return valve core 92 is centered in the insertion hole 93, a uniform annular gap is formed between the first sealing surface 9221 and the second sealing surface 931, so that the oil can be throttled when passing through this position.

[0042] Preferably, the valve body 91 is further provided with an elastic element 98. The elastic element 98 can center the return valve core 92 within the insertion hole 93, so that when there is no pressure, neither of the two oil passages is connected to the third oil passage 97. Moreover, when the return valve core 92 moves, it needs to overcome the elastic force of the elastic element 98, so that the oil passages of the valve body 91 have a certain pressure during control, which facilitates control and can also control small flow oil circuits. Specifically, in this embodiment, the elastic element 98 is a spring, which is provided in two parts. The two springs abut against the return valve core 92 on both sides of the insertion hole 93, so that the return valve core 92 is centered within the insertion hole 93 under the action of the two springs.

[0043] When the bidirectional self-controlled return valve structure 9 is working, after the hydraulic oil enters the first oil passage 95, the oil pressure acts on the sealing head 922 on the left side of the return valve core 92. Some oil leaks through the return valve core 92 to the third oil passage 97. The throttling surface of the annular gap plays a throttling role, reducing oil leakage, allowing the hydraulic pump 3 to build up pressure instantly and quickly. This pressure overcomes the elastic force of the right spring, and the hydraulic oil pushes the return valve core 92 to move to the opposite side until the sealing head 922 on the left side is tightly pressed against the sealing surface of the valve body 91, forming a reliable seal (see...). Figure 7 At this time, the return valve core 92 is in the first working position, blocking the connection between the first oil passage 95 and the third oil passage 97, while simultaneously opening the second oil passage 96 and the third oil passage 97. Similarly, after the liquid oil enters the second oil passage 96, it pushes the return valve core 92 to the left until the sealing head 922 on the right side is tightly pressed against the sealing surface of the valve body 91 (see...). Figure 8 At this time, the return valve core 92 is in the second working position. The return valve core 92 blocks the connection between the second oil passage 96 and the third oil passage 97, and at the same time opens the first oil passage 95 and the third oil passage 97.

[0044] The bidirectional self-controlled return valve structure 9 also includes a plug 99. The two ends of the connecting channel 94 extend to the edge of the valve body 91 and completely penetrate the valve body 91. The plug 99 is provided with two connecting channels 94 respectively, so that the return valve core 92 and the elastic element 98 in the connecting channel 94 can be removed for maintenance and cleaning.

[0045] Preferably, both the first and second control oil circuits are equipped with relief valves. These relief valves allow pressure relief when the oil pressure in the circuit exceeds a predetermined pressure. Specifically, there are two relief valves: a first relief valve 10 and a second relief valve 11. The inlet of the first relief valve 10 is connected between the outlet of the first filter screen and the inlet of the hydraulic lock 8, and its outlet is connected to the oil tank 1. The inlet of the second relief valve 11 is connected between the outlet of the second filter screen and the hydraulic lock 8, and its outlet is connected to the oil tank 1. In the first control oil circuit, when the pressure is too high, the excess oil can be returned to the oil tank 1 through the first relief valve 10. Similarly, in the second control oil circuit, when the pressure is too high, the excess oil can be returned to the oil tank 1 through the second relief valve 11. In this utility model, the pressure in the first and second control oil circuits is mainly controlled by the bidirectional self-controlled return oil valve 9. The first relief valve 10 and the second relief valve 11 are mainly designed to prevent special situations where the pressure exceeds the control pressure of the bidirectional self-controlled return oil valve 9.

[0046] The double-acting power unit in this utility model is used as follows: When motor 2 rotates forward, hydraulic pump 3 draws oil from oil tank 1 through second check valve 5. The hydraulic oil discharged by hydraulic pump 3 enters first oil passage 95, and the internal pressure of second oil passage 96 decreases instantaneously. At the same time, the annular gap between return valve core 92 and socket 93 acts as a throttling device, reducing oil leakage and allowing hydraulic pump 3 to build up pressure quickly and instantaneously. The hydraulic oil pushes return valve core 92 to the opposite side, forming a sealing surface with valve body 91. First oil passage 95 is disconnected from third oil passage 97, while second oil passage 96 is connected to third oil passage 97. First check valve 4 is closed, and hydraulic oil passes through first filter screen and then through hydraulic lock 8 to enter the bottom of oil cylinder 10, pushing oil cylinder 10 to rise. The oil at the top of oil cylinder 10 returns to second oil passage 96 and third oil passage 97 through hydraulic lock 8 and second filter screen, and finally returns to oil tank 1.

[0047] When motor 2 reverses, hydraulic pump 3 draws oil from the first check valve 4. The hydraulic oil discharged by hydraulic pump 3 enters the second oil passage 96, and the internal pressure of the first oil passage 95 decreases instantaneously. At the same time, the annular gap between the return valve core 92 and the socket 93 acts as a throttling mechanism, reducing oil leakage and allowing hydraulic pump 3 to quickly build up pressure. The hydraulic oil pushes the return valve core 92 to move to the opposite side, forming a sealing surface with the valve body 91. The second oil passage 96 is disconnected from the third oil passage 97, while the first oil passage 95 is connected to the third oil passage 97. The second check valve 5 is closed, and the hydraulic oil passes through the second filter screen and then through the hydraulic lock 8 to enter the top of the cylinder 10, pushing the cylinder 10 down. The oil at the bottom of the cylinder 10 returns to the first oil passage 95 through the hydraulic lock 8 and the first filter screen. At this time, the amount of oil returned is greater than the amount required by hydraulic pump 3, and the excess must be discharged. Due to the presence of the return valve, the first oil passage 95 is connected to the third passage, and the excess oil is discharged from here, finally returning to the oil tank 1.

[0048] During this process, the annular gap between the return valve core 92 and the insertion hole 93 plays a throttling role, and the valve core can also achieve free reversal under low flow conditions to meet the low flow conditions (≤0.4L / min).

[0049] The dual-acting power unit of this utility model has a bidirectional self-controlled return oil valve 9 in the oil circuit, which integrates the functions of reversing, sealing, and throttling. It replaces the traditional method of adding a bypass circuit or direct overflow. It achieves sealing valve, instantaneous throttling, circuit opening and closing, and control of fluid flow direction through its own hydraulic power and pressure.

[0050] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A bidirectional self-controlled oil return valve structure, characterized in that, include: The valve body has an internal connecting channel, a socket, and multiple oil passages. The connecting channel has two sections, which are connected by the socket. The multiple oil passages are respectively connected to the two sections of the connecting channel and the socket. A return valve core is disposed in the valve body, and the return valve core can move between a first working position and a second working position in the socket under oil pressure; When the return valve core is in the first working position, the return valve core blocks one section of the connecting channel from communicating with the socket, and blocks the oil passage connected to that section of the connecting channel from communicating with other oil passages. When the return valve core is in the second working position, the return valve core blocks the connection between the other section of the connecting channel and the socket, and blocks the oil passage connected to this section of the connecting channel from connecting with other oil passages.

2. The bidirectional self-controlled oil return valve structure according to claim 1, characterized in that, The return valve core includes a connecting rod and two sealing heads disposed at both ends of the connecting rod. The cross-sectional dimension of the sealing head is larger than the diameter of the insertion hole. The connecting rod is movably installed in the insertion hole, and when the connecting rod moves, the sealing heads at both ends of the connecting rod can block the ends of the insertion hole.

3. The bidirectional self-controlled oil return valve structure according to claim 2, characterized in that, The sealing head and the connecting rod are detachably connected.

4. The bidirectional self-controlled oil return valve structure according to claim 2, characterized in that, The sealing head is provided with a first sealing surface, and the insertion hole is provided with a second sealing surface. A throttling annular gap can be formed between the first sealing surface and the second sealing surface. When the return valve core moves in the insertion hole, the first sealing surface can abut against the second sealing surface to form a seal.

5. The bidirectional self-controlled oil return valve structure according to claim 4, characterized in that, The first sealing surface is a tapered surface provided on the sealing head, and the second sealing surface is a tapered concave surface provided at the end of the insertion hole.

6. A bidirectional self-regulating return oil valve structure according to any one of claims 1-5, characterized in that, The plurality of oil passages include a first oil passage connecting one section of the connecting channel, a second oil passage connecting another section of the connecting channel, and a third oil passage connecting the socket; When the return valve core is in the first working position, the return valve core blocks the connection between the first oil passage and the third oil passage, and at the same time opens the connection between the second oil passage and the third oil passage. When the return valve core is in the second working position, the return valve core blocks the connection between the second oil passage and the third oil passage, and at the same time opens the connection between the first oil passage and the third oil passage.

7. The bidirectional self-controlled oil return valve structure according to claim 6, characterized in that, The third oil passage connects from the side to the middle of the insertion hole.

8. A bidirectional self-regulating return valve structure according to any one of claims 1-5, characterized in that, The valve body is also provided with an elastic element that keeps the return valve core centered.

9. The bidirectional self-controlled oil return valve structure according to claim 8, characterized in that, The elastic element consists of two springs, which are respectively disposed at both ends of the insertion hole and abut against both ends of the return valve core.

10. A bidirectional self-regulating return valve structure according to any one of claims 1-5, characterized in that, The valve body is provided with a plug that can be used to open the two connecting channels.

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