A hydraulic control valve and a hydraulic operating mechanism

Abstract

The present invention relates to a hydraulic control valve and a hydraulic operating mechanism. The hydraulic control valve includes a valve body, in which a low-pressure oil chamber, a high-pressure oil chamber and a control oil chamber are arranged. On the valve body, there are a trip valve port for communicating the low-pressure oil chamber and the control oil chamber, and a closing valve port for communicating the high-pressure oil chamber and the control oil chamber. A valve core is movably inserted through the trip valve port and the closing valve port. The valve core has a trip position in sealing contact with the closing valve port, and also has a closing position in sealing contact with the trip valve port. A buffer structure is also arranged in the valve body on one side in the direction of the trip position of the valve core, and the buffer structure is used to buffer and decelerate the valve core when the valve core moves close to the trip position during the trip process. The present invention effectively solves the problem in the prior art that the valve core and the closing valve port are more likely to be damaged when colliding because the valve core is subjected to a greater driving force during the trip process.

Description

Technical Field

[0001] The present invention relates to a hydraulic control valve and a hydraulic operating mechanism, belonging to the technical field of fluid pressure actuators. Background Art

[0002] Currently, hydraulic operating mechanisms, especially disc spring hydraulic mechanisms, are widely used in power grid systems. In a hydraulic operating mechanism, a hydraulic control valve is not only the core component of the mechanism but also the most delicate part. It receives opening and closing commands and completes the state switching of the hydraulic system.

[0003] In current disc spring hydraulic mechanisms, a commonly used control valve is a two-position three-way electro-hydraulic valve. For example, the hydraulic control valve in the circuit breaker, hydraulic control valve, and hydraulic operating mechanism disclosed in the Chinese invention patent application with the application publication number CN112443526A. The hydraulic control valve generally includes a valve body. A low-pressure oil chamber, a high-pressure oil chamber, and a control oil chamber located between the two are provided in the valve body. A low-pressure oil port communicating with the low-pressure oil chamber, a high-pressure oil port communicating with the high-pressure oil chamber, and a control oil port communicating with the control oil chamber are provided on the valve body. A tripping valve port for communicating the low-pressure oil chamber and the control oil chamber and a closing valve port for communicating the high-pressure oil chamber and the control oil chamber are also provided on the valve body. A valve core is movably inserted through the tripping valve port and the closing valve port. The valve core has a tripping position and a closing position. In the tripping position, the valve core is in sealed contact with the closing valve port. At this time, the high-pressure oil chamber is cut off from the control oil chamber, and the low-pressure oil chamber is communicated with the control oil chamber through the tripping valve port, and the tripping operation of the hydraulic operating mechanism can be realized; in the closing position, the valve core is in sealed contact with the tripping valve port. At this time, the low-pressure oil chamber is cut off from the control oil chamber, and the high-pressure oil chamber is communicated with the control oil chamber through the closing valve port, and the closing operation of the hydraulic operating mechanism can be realized.

[0004] During the opening and closing process of the mechanism, compared with the closing speed, since the mechanism requires a higher opening speed, the valve core will receive a greater driving force during the opening process. At the same time, since the valve core mainly relies on hard collisions with the tripping valve port and the closing valve port for stopping, there is a greater risk of damage to the valve core and the closing valve port during the collision in the opening process. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic control valve to solve the problem that the valve core and the closing valve port are more likely to be damaged during the collision due to the greater driving force received by the valve core during the opening process in the prior art; another purpose of the present invention is to provide a hydraulic operating mechanism to solve the above problems.

[0006] To achieve the above purpose, the hydraulic control valve in the present invention adopts the following technical solutions:

[0007] A hydraulic control valve includes a valve body. A low-pressure oil chamber, a high-pressure oil chamber, and a control oil chamber located between the two are provided inside the valve body. A shut-off valve port for connecting the low-pressure oil chamber and the control oil chamber, and a closing valve port for connecting the high-pressure oil chamber and the control oil chamber are provided on the valve body. A valve core is movably inserted through the shut-off valve port and the closing valve port. The valve core has a shut-off position in which it is in sealing contact with the closing valve port to cut off the control oil chamber from the high-pressure oil chamber and connect the control oil chamber with the low-pressure oil chamber. The valve core also has a closing position in which it is in sealing contact with the shut-off valve port to cut off the control oil chamber from the low-pressure oil chamber and connect the control oil chamber with the high-pressure oil chamber. A buffer structure is also provided inside the valve body on one side in the direction of the shut-off position of the valve core. The buffer structure is used to buffer and decelerate the valve core when the valve core moves close to the shut-off position during the shut-off process.

[0008] The beneficial effects of the above technical solution are as follows: The present invention improves the existing hydraulic control valve. In the hydraulic control valve of the present invention, since a buffer structure is provided inside the valve body on one side in the direction of the shut-off position of the valve core, during the shut-off process, when the valve core moves towards the shut-off position and is close to the shut-off position, the buffer structure can buffer and decelerate the valve core. Compared with the prior art, through the buffer structure, the collision force between the valve core and the closing valve port during the shut-off process can be reduced, and thus the risk of damage when the valve core collides with the closing valve port can be reduced.

[0009] Further, a guide hole and a piston chamber are sequentially provided inside the valve body on the side of the high-pressure oil chamber away from the control oil chamber. The guide hole connects the high-pressure oil chamber and the piston chamber. The valve core is in guiding cooperation with the guide hole. The buffer structure includes a piston body located inside the piston chamber and in sealing cooperation with the inner wall of the piston chamber, and a striker located inside the guide hole for colliding and contacting the valve core. The guide hole and the piston chamber are used to communicate with the low-pressure oil chamber during the shut-off process to discharge the high-pressure oil in the guide hole and the piston chamber to the low-pressure oil chamber, so that the valve core moves towards the shut-off position and collides with the striker to push the piston body to move. The guide hole and the piston chamber are also used to communicate with the high-pressure oil chamber during the closing process, so that the high-pressure oil in the high-pressure oil chamber enters the guide hole and the piston chamber, pushing the piston body and the striker to reset and pushing the valve core to move towards the closing position.

[0010] The beneficial effects of the above technical solution are as follows: The buffer structure composed of the piston body and the striker simplifies the structural form of the buffer structure and its arrangement in the valve body to a certain extent, which is beneficial to the manufacture of the buffer structure and the assembly of the hydraulic control valve; the striker can shorten the length of the valve core, which facilitates the manufacture of the valve core and also facilitates the valve core to push the piston body to move; the piston cavity facilitates the installation of the piston body. During the opening process, since both the guiding hole and the piston cavity are communicated with the low-pressure oil cavity, the valve core can move towards the opening position and will first collide with the striker in the guiding hole, and then push the piston body to move away from the valve core. During the movement of the piston body, since the low-pressure passage is communicated with the piston cavity on the side of the piston body away from the valve core, the hydraulic oil in the piston cavity will be discharged through the low-pressure passage. At the same time, the compressed hydraulic oil in the piston cavity will also provide a buffer resistance to the piston body. In this way, the buffer resistance can buffer and decelerate the piston body, and thus can also buffer and decelerate the valve core; during closing, since both the guiding hole and the piston cavity are communicated with the high-pressure oil cavity, the high-pressure oil can be used to push the piston body and the striker to reset and push the valve core to move towards the closing position to achieve closing.

[0011] Further, a blind hole communicated with the piston cavity and located on the side of the piston body away from the valve core is provided on the valve body, and an insertion section for inserting into the blind hole is provided on the piston body. The outer diameter of the insertion section is smaller than the inner diameter of the blind hole, so that an annular gap for discharging the hydraulic oil in the piston cavity is formed between the insertion section and the blind hole when the insertion section is inserted into the blind hole.

[0012] The beneficial effects of the above technical solution are as follows: By providing the insertion section and the blind hole, not only can the buffer resistance of the hydraulic oil in the piston cavity to the piston body be used for buffering and decelerating, but also during the process of the insertion section being inserted into the blind hole, since the hydraulic oil in the piston cavity will be discharged through the annular gap between the insertion section and the blind hole, the buffer damping generated when the hydraulic oil flows through the annular gap can also be used to buffer and decelerate the movement of the valve core, which is beneficial to further ensuring the buffer and deceleration effect on the valve core.

[0013] Further, the piston body is in a "convex" shape. The piston body includes a large-diameter section and a small-diameter section. The large-diameter section is used for sealing cooperation with the inner wall of the piston cavity, and the small-diameter section constitutes the insertion section.

[0014] The beneficial effects of the above technical solution are as follows: It simplifies the specific structural form of the piston body and facilitates the manufacture of the piston body. In this way, the sealing cooperation with the inner wall of the piston cavity can be achieved through the large-diameter section, and at the same time, the cooperation with the blind hole can be achieved through the small-diameter section.

[0015] Further, a chamfer structure is provided at the end of the insertion section.

[0016] The beneficial effects of the above technical solution are as follows: Through the chamfer structure, it is not only convenient for the insertion section to be inserted into the blind hole, but also can reduce the risk of the end of the insertion section being damaged by impact.

[0017] Further, the valve body includes a main valve body and a cylinder block connected to the main valve body, and the cylinder block and the main valve body jointly enclose the piston cavity.

[0018] The beneficial effects of the above technical solution are as follows: By jointly enclosing the piston cavity by the cylinder block and the main valve body, when improving on the basis of the existing hydraulic control valve, it is not necessary to make too many changes to the valve body of the existing hydraulic control valve, which is beneficial to facilitating the improvement and manufacturing of the hydraulic control valve.

[0019] Further, the striker is separately arranged from the piston body.

[0020] The beneficial effects of the above technical solution are as follows: It is not only convenient for the processing and manufacturing of the buffer structure, but also convenient for the installation of the buffer structure in the valve body.

[0021] Further, the striker has a small-diameter section for approaching the valve core and a large-diameter section for moving away from the valve core.

[0022] The beneficial effects of the above technical solution are as follows: In this way, the guiding fit with the guiding hole can be realized through the large-diameter section, and at the same time, when closing the switch, the high-pressure oil can enter the guiding hole through the gap between the small-diameter section and the guiding hole to push the valve core towards the closing position.

[0023] Further, the piston body and the inner wall of the piston cavity are in sealing fit through a sealing ring, and an annular groove for installing the sealing ring is arranged on the outer peripheral surface of the piston body.

[0024] The beneficial effects of the above technical solution are as follows: The installation of the sealing ring is facilitated through the annular groove, the stability of the installation of the sealing ring can be ensured, and further the sealing fit degree between the piston body and the inner wall of the piston cavity can be ensured.

[0025] To achieve the above object, the following technical solution is adopted for the hydraulic operating mechanism in the present invention:

[0026] A hydraulic operating mechanism includes a hydraulic control valve. The hydraulic control valve includes a valve body. A low-pressure oil chamber, a high-pressure oil chamber, and a control oil chamber located between the two are provided in the valve body. A trip valve port for connecting the low-pressure oil chamber and the control oil chamber and a closing valve port for connecting the high-pressure oil chamber and the control oil chamber are provided on the valve body. A valve core movably penetrates through the trip valve port and the closing valve port. The valve core has a trip position in which it is in sealing contact with the closing valve port to cut off the control oil chamber from the high-pressure oil chamber and connect the control oil chamber with the low-pressure oil chamber. The valve core also has a closing position in which it is in sealing contact with the trip valve port to cut off the control oil chamber from the low-pressure oil chamber and connect the control oil chamber with the high-pressure oil chamber. It is characterized in that a buffer structure is further provided in the valve body on one side in the direction of the trip position of the valve core. The buffer structure is used to buffer and decelerate the valve core when the valve core moves close to the trip position during the trip process.

[0027] The beneficial effects of the above technical solution are as follows: The present invention improves the existing hydraulic operating mechanism. In the hydraulic operating mechanism of the present invention, since a buffer structure is provided in the valve body on one side in the direction of the trip position of the valve core, during the trip process, when the valve core moves towards the trip position and is close to the trip position, the buffer structure can buffer and decelerate the valve core. Compared with the prior art, the buffer structure can reduce the collision force between the valve core and the closing valve port during the trip process, and further reduce the risk of damage when the valve core collides with the closing valve port.

[0028] Further, a guide hole and a piston chamber are sequentially provided on the side of the high-pressure oil chamber away from the control oil chamber in the valve body. The guide hole connects the high-pressure oil chamber and the piston chamber. The valve core is in guiding cooperation with the guide hole. The buffer structure includes a piston body located in the piston chamber and in sealing cooperation with the inner wall of the piston chamber, and a striker located in the guide hole for colliding with the valve core. The guide hole and the piston chamber are used to communicate with the low-pressure oil chamber during the trip to discharge the high-pressure oil in the guide hole and the piston chamber to the low-pressure oil chamber, so that the valve core moves towards the trip position and collides with the striker to push the piston body to move. The guide hole and the piston chamber are also used to communicate with the high-pressure oil chamber during the closing to enable the high-pressure oil in the high-pressure oil chamber to enter the guide hole and the piston chamber, push the piston body and the striker to reset, and push the valve core to move towards the closing position.

[0029] The beneficial effects of the above technical solution are as follows: The buffer structure composed of the piston body and the striker simplifies the structural form of the buffer structure and its arrangement in the valve body to a certain extent, which is conducive to the manufacture of the buffer structure and the assembly of the hydraulic control valve; the length of the valve core can be shortened through the striker, which facilitates the manufacture of the valve core and also facilitates the valve core to push the piston body to move; the installation of the piston body is facilitated through the piston cavity. During the opening process, since both the guiding hole and the piston cavity are communicated with the low-pressure oil cavity, the valve core can move towards the opening position and will first collide with the striker in the guiding hole, and then push the piston body to move away from the valve core. During the movement of the piston body, since the low-pressure passage is communicated with the piston cavity on the side of the piston body away from the valve core, the hydraulic oil in the piston cavity will be discharged through the low-pressure passage. At the same time, the squeezed hydraulic oil in the piston cavity will also provide a buffer resistance to the piston body. In this way, the buffer resistance can buffer and decelerate the piston body, and thus can also buffer and decelerate the valve core; during closing, since both the guiding hole and the piston cavity are communicated with the high-pressure oil cavity, the high-pressure oil can be used to push the piston body and the striker to reset and push the valve core to move towards the closing position to achieve closing.

[0030] Further, a blind hole communicated with the piston cavity and located on the side of the piston body away from the valve core is provided on the valve body, and an insertion section for inserting into the blind hole is provided on the piston body. The outer diameter of the insertion section is smaller than the inner diameter of the blind hole, so that an annular gap for discharging the hydraulic oil in the piston cavity is formed between the insertion section and the blind hole when the insertion section is inserted into the blind hole.

[0031] The beneficial effects of the above technical solution are as follows: By providing the insertion section and the blind hole, not only can the buffer resistance of the hydraulic oil in the piston cavity to the piston body be used for buffering and decelerating, but also during the process of the insertion section being inserted into the blind hole, since the hydraulic oil in the piston cavity will be discharged through the annular gap between the insertion section and the blind hole, the buffer damping generated when the hydraulic oil flows through the annular gap can also be used to buffer and decelerate the movement of the valve core, which is beneficial to further ensuring the buffer and deceleration effect on the valve core.

[0032] Further, the piston body is in a "convex" shape and includes a large-diameter section and a small-diameter section. The large-diameter section is used for sealing cooperation with the inner wall of the piston cavity, and the small-diameter section constitutes the insertion section.

[0033] The beneficial effects of the above technical solution are as follows: The specific structural form of the piston body is simplified, which facilitates the manufacture of the piston body. In this way, the sealing cooperation with the inner wall of the piston cavity can be achieved through the large-diameter section, and the cooperation with the blind hole can also be achieved through the small-diameter section.

[0034] Further, a chamfer structure is provided at the end of the insertion section.

[0035] The beneficial effects of the above technical solution are as follows: Through the chamfer structure, it is not only convenient for the insertion section to be inserted into the blind hole, but also can reduce the risk of the end of the insertion section being damaged by impact.

[0036] Further, the valve body includes a main valve body and a cylinder block connected to the main valve body, and the cylinder block and the main valve body jointly enclose the piston chamber.

[0037] The beneficial effects of the above technical solution are as follows: By jointly enclosing the piston chamber by the cylinder block and the main valve body, when improving on the basis of the existing hydraulic control valve, it is not necessary to make too many changes to the valve body of the existing hydraulic control valve, which is beneficial to facilitate the improvement and manufacture of the hydraulic control valve.

[0038] Further, the impact head is separately arranged from the piston body.

[0039] The beneficial effects of the above technical solution are as follows: It is not only convenient for the processing and manufacturing of the buffer structure, but also convenient for the installation of the buffer structure in the valve body.

[0040] Further, the impact head has a small-diameter section for approaching the valve core and a large-diameter section for moving away from the valve core.

[0041] The beneficial effects of the above technical solution are as follows: In this way, the guiding fit with the guiding hole can be achieved through the large-diameter section, and at the same time, when closing the valve, the high-pressure oil can enter the guiding hole through the gap between the small-diameter section and the guiding hole to push the valve core towards the closing position.

[0042] Further, the piston body and the inner wall of the piston chamber are in sealing fit through a sealing ring, and an annular groove for installing the sealing ring is arranged on the outer peripheral surface of the piston body.

[0043] The beneficial effects of the above technical solution are as follows: The installation of the sealing ring is facilitated through the annular groove, the stability of the installation of the sealing ring can be ensured, and further the sealing fit degree between the piston body and the inner wall of the piston chamber can be ensured. Description of the Drawings

[0044] Figure 1 is a partial cross-sectional view of the hydraulic control valve in Embodiment 1 of the hydraulic control valve of the present invention.

[0045] In the figure: 10, outer valve body; 11, low-pressure oil port; 12, control oil port; 13, high-pressure oil port; 20, left valve sleeve; 21, left moving chamber; 22, opening valve port; 30, right valve sleeve; 31, guiding hole; 32, closing valve port; 40, valve core; 50, cylinder block; 51, blind hole; 60, piston chamber; 70, piston body; 71, insertion section; 80, impact head; 90, sealing ring; 100, opening pilot valve; 110, closing pilot valve; 120, low-pressure oil chamber; 130, high-pressure oil chamber; 140, control oil chamber; 150, connecting passage. Detailed Implementation Manner

[0046] Embodiment 1 of the hydraulic control valve in the present invention:

[0047] The present invention improves the existing hydraulic control valve. By arranging a buffer structure on one side of the valve core in the direction of the opening position in the valve body, during the opening process, when the valve core moves towards the opening position and approaches the opening position, the buffer structure can buffer and decelerate the valve core. Compared with the prior art, the buffer structure can reduce the collision force between the valve core and the closing valve port during the opening process, and further reduce the risk of damage when the valve core collides with the closing valve port.

[0048] Specifically, as Figure 1 shown, the hydraulic control valve is usually used to control the opening and closing operations of a hydraulic operating mechanism. The hydraulic control valve includes a valve body, and the valve body includes a main valve body. The main valve body includes an outer valve body 10, and a left valve sleeve 20 and a right valve sleeve 30 that are arranged at intervals left and right inside the outer valve body 10. The right end of the left valve sleeve 20 has an opening, and the left end of the right valve sleeve 30 has an opening. A valve core 40 is movably installed in the left valve sleeve 20 and the right valve sleeve 30. The valve core 40 and the left valve sleeve 20 and the right valve sleeve 30 together enclose a low-pressure oil chamber 120, a high-pressure oil chamber 130, and a control oil chamber 140 located between the two inside the outer valve body 10. The opening at the right end of the left valve sleeve 20 constitutes a opening valve port 22 for communicating the low-pressure oil chamber 120 and the control oil chamber 140, and the opening at the left end of the right valve sleeve 30 constitutes a closing valve port 32 for communicating the high-pressure oil chamber 130 and the control oil chamber 140, that is, the valve core 40 movably passes through the opening valve port 22 and the closing valve port 32. During the opening and closing process of the valve core 40, it has an opening position and a closing position. At the opening position, the valve core 40 is in sealed contact with the closing valve port 32. At this time, the high-pressure oil chamber 130 is separated from the control oil chamber 140, and the low-pressure oil chamber 120 is communicated with the control oil chamber 140 through the opening valve port 22, and the opening operation of the hydraulic operating mechanism can be realized; at the closing position, the valve core 40 is in sealed contact with the opening valve port 22. At this time, the low-pressure oil chamber 120 is separated from the control oil chamber 140, and the high-pressure oil chamber 130 is communicated with the control oil chamber 140 through the closing valve port 32, and the closing operation of the hydraulic operating mechanism can be realized. In addition, a low-pressure oil port 11 communicated with the low-pressure oil chamber 120, a high-pressure oil port 13 communicated with the high-pressure oil chamber 130, and a control oil port 12 communicated with the control oil chamber 140 are provided on the outer valve body 10.

[0049] As Figure 1As shown in the figure, a left moving chamber 21 located at the left end of the valve core 40 is provided inside the left valve sleeve 20, and the left moving chamber 21 is communicated with the high-pressure oil chamber 130 through a passage (not shown in the figure). Therefore, there is high-pressure oil in the left moving chamber 21. A low-pressure passage (not shown in the figure) communicated with the low-pressure oil chamber 120 and a high-pressure passage (not shown in the figure) communicated with the high-pressure oil chamber 130 are provided on the main valve body. A closing pilot valve 100 communicated with the low-pressure passage and used to control the on-off of the low-pressure passage and a closing pilot valve 110 communicated with the high-pressure passage and used to control the on-off of the high-pressure passage are fixedly installed on the outer valve body 10. A guiding hole 31 coaxial with the valve core 40 and located on the right side of the high-pressure oil chamber 130 is provided inside the right valve sleeve 30. The valve core 40 is in guiding cooperation with the guiding hole 31, and the guiding hole 31 is communicated with both the low-pressure passage and the high-pressure passage.

[0050] Since the opening speed of the hydraulic driving mechanism is relatively fast, the valve core 40 will be subjected to a greater driving force during the opening process. To avoid the collision damage of the valve core 40 and the closing valve port 32 caused by the greater driving force, a buffer structure is further provided inside the valve body on one side in the opening position direction of the valve core 40. The buffer structure is used to buffer and decelerate the valve core 40 when the valve core 40 moves close to the opening position during opening. Specifically, the valve body further includes a cylinder block 50 connected to the right end of the main valve body. The cylinder block 50 and the right end of the right valve sleeve 30 jointly enclose a piston chamber 60 communicated with the guiding hole 31, and the piston chamber 60 is located on the right side of the guiding hole 31. Relative to the high-pressure oil chamber 130, the guiding hole 31 and the piston chamber 60 are sequentially arranged on the side of the high-pressure oil chamber 130 away from the control oil chamber 140. A blind hole 51 communicated with the piston chamber 60 and located on the side of the piston body 70 away from the valve core 40 is further provided on the cylinder block 50. A connecting passage 150 for directly communicating the control oil chamber 140 and the blind hole 51 is provided on the outer valve body 10 and the cylinder block 50, and the connecting passage 150 is communicated with the corresponding low-pressure passage and high-pressure passage respectively through the opening pilot valve 100 and the closing pilot valve 110. The buffer structure includes a piston body 70 located inside the piston chamber 60 and in sealing cooperation with the inner wall of the piston chamber 60, and a striker 80 located inside the guiding hole 31 and used to collide and contact the valve core 40. Among them, the striker 80 is separately arranged from the piston body 70. The striker 80 is in the shape of a stepped shaft, and the striker 80 has a first small-diameter section arranged close to the valve core 40 and a first large-diameter section arranged away from the valve core 40.

[0051] As Figure 1As shown, the piston body 70 is in a "convex" shape. The piston body 70 includes a second large-diameter section and a second small-diameter section. The second large-diameter section is used for sealing cooperation with the inner wall of the piston chamber 60 through a sealing ring 90, and an annular groove for installing the sealing ring 90 is provided on the outer peripheral surface of the second large-diameter section. A chamfer structure is provided at the end of the second small-diameter section. The second small-diameter section is used for insertion into the blind hole 51, and the outer diameter of the second small-diameter section is smaller than the inner diameter of the blind hole 51, so that an annular gap for discharging the hydraulic oil in the piston chamber 60 is formed between the insertion section 71 and the blind hole 51 when the insertion section 71 is inserted into the blind hole 51.

[0052] The working principle of the hydraulic control valve in the present invention is as follows:

[0053] During opening, as Figure 1 shown, the opening pilot valve 100 connects the low-pressure passage, and the guide hole 31 and the piston chamber 60 are communicated with the low-pressure oil chamber 120 to discharge the high-pressure oil between the valve core 40 and the striker 80 in the guide hole 31 and the high-pressure oil in the piston chamber 60 and the blind hole 51 to the low-pressure oil chamber 120 to achieve pressure relief. At this time, under the action of the high pressure at the left end of the valve core 40, the valve core 40 moves to the left. When the valve core 40 moves close to the opening position, the valve core 40 collides with the striker 80, and then pushes the piston body 70 to move to the right. During this process, the hydraulic oil in the piston chamber 60 will be discharged through the annular gap between the insertion section 71 and the blind hole 51. In this way, the buffer damping generated when the hydraulic oil flows through the annular gap can be used to buffer and decelerate the movement of the valve core 40 until the valve core 40 moves to the opening position.

[0054] During closing, the closing pilot valve 110 connects the high-pressure passage, and the guide hole 31 and the piston chamber 60 are communicated with the high-pressure oil chamber 130. The high-pressure oil in the high-pressure oil chamber 130 will flow into the gap between the valve core 40 and the striker 80 in the guide hole 31 and the piston chamber 60 and the blind hole 51, and the valve core 40 will also be affected by the pressure of the high-pressure oil in the high-pressure oil chamber 130. Under the action of the pressure difference, the valve core 40 is pushed to move to the left until the valve core 40 moves to the closing position.

[0055] Embodiment 2 of the hydraulic control valve in the present invention:

[0056] This embodiment provides a setting of the annular groove different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the annular groove is provided on the inner wall of the piston chamber, and the sealing ring is installed on the inner wall of the piston chamber through the annular groove.

[0057] Embodiment 3 of the hydraulic control valve in the present invention:

[0058] This embodiment provides a structure of the striker different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the striker is a cylinder with an equal diameter.

[0059] Embodiment 4 of the hydraulic control valve in the present invention:

[0060] This embodiment provides a structure of the striker different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the piston body is L-shaped. The piston body includes a piston section that is sealingly fitted with the inner wall of the piston chamber, and an insertion section that is perpendicularly arranged with respect to the piston section and is used for inserting into the blind hole.

[0061] Embodiment 5 of the hydraulic control valve in the present invention:

[0062] This embodiment provides a connection relationship between the striker and the piston body different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the striker and the piston body are integrally formed.

[0063] Embodiment 6 of the hydraulic control valve in the present invention:

[0064] This embodiment provides a valve body different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the valve body only includes a main valve body, and the piston chamber is formed by an inner cavity provided in the main valve body.

[0065] Embodiment 7 of the hydraulic control valve in the present invention:

[0066] This embodiment provides an insertion section different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, a chamfer structure is not provided at the end of the insertion section 71.

[0067] Embodiment 8 of the hydraulic control valve in the present invention:

[0068] This embodiment provides a piston chamber and a piston body different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, no blind hole is provided on the valve body, no insertion section is provided on the piston body, and the side surface of the piston chamber far from the valve core is a plane. In this case, the hydraulic oil in the piston chamber can be directly discharged by the movement of the piston body.

[0069] Embodiment 9 of the hydraulic control valve in the present invention:

[0070] This embodiment provides a buffer structure different from that in Embodiment 1. The difference between this embodiment and Embodiment 1 is that in this embodiment, the buffer structure includes a spring provided on one side in the direction of the opening position of the valve core, so that when the valve core collides with the spring, the valve core can be buffered and decelerated by the elastic force of the spring.

[0071] Embodiment of the hydraulic operating mechanism in the present invention: The hydraulic operating mechanism includes a hydraulic control valve, and the specific structure of the hydraulic control valve is the same as that of the hydraulic control valve in the above-mentioned embodiments of the hydraulic control valve, and will not be repeated here.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. The patent protection scope of the present invention shall be subject to the claims. Any equivalent structural changes made by using the content of the specification and drawings of the present invention shall similarly be included in the protection scope of the present invention.

Claims

1. A hydraulic control valve, comprising a valve body, a low-pressure oil chamber, a high-pressure oil chamber and a control oil chamber located therebetween are arranged in the valve body, a circuit breaker valve port for connecting the low-pressure oil chamber and the control oil chamber and a closing valve port for connecting the high-pressure oil chamber and the control oil chamber are arranged on the valve body, a valve core is movably inserted through the circuit breaker valve port and the closing valve port, the valve core has a circuit breaker position in which it is in sealing contact with the closing valve port to cut off the control oil chamber from the high-pressure oil chamber and connect the control oil chamber with the low-pressure oil chamber, and the valve core further has a closing position in which it is in sealing contact with the circuit breaker valve port to cut off the control oil chamber from the low-pressure oil chamber and connect the control oil chamber with the high-pressure oil chamber; characterized in that, A buffer structure is also provided inside the valve body on one side in the direction of the valve core opening position. The buffer structure is used to buffer and decelerate the valve core when the valve core moves close to the opening position during the opening process. A guide hole and a piston chamber are sequentially provided inside the valve body on the side of the high-pressure oil chamber away from the control oil chamber. The guide hole communicates the high-pressure oil chamber and the piston chamber, and the valve core is in guiding fit with the guide hole. The buffer structure includes a piston body located inside the piston chamber and sealingly fitted with the inner wall of the piston chamber, and a striker located inside the guide hole for collision contact with the valve core. The guide hole and the piston chamber are used to communicate with the low-pressure oil chamber during opening to drain the high-pressure oil in the guide hole and the piston chamber to the low-pressure oil chamber, so that the valve core moves in the direction of the opening position and collides with the striker to push the piston body to move. The guide hole and the piston chamber are also used to communicate with the high-pressure oil chamber during closing, so that the high-pressure oil in the high-pressure oil chamber enters the guide hole and the piston chamber, pushing the piston body and the striker to reset and pushing the valve core to move in the direction of the closing position.

2. The hydraulic control valve according to claim 1, characterized in that, A blind hole communicating with the piston chamber and located on the side of the piston body away from the valve core is provided on the valve body. An insertion section for inserting into the blind hole is provided on the piston body. The outer diameter of the insertion section is smaller than the inner diameter of the blind hole, so that an annular gap for discharging the hydraulic oil in the piston chamber is formed between the insertion section and the blind hole when the insertion section is inserted into the blind hole.

3. The hydraulic control valve according to claim 2, characterized in that, The piston body is in a "convex" shape and includes a large-diameter section and a small-diameter section. The large-diameter section is used for sealingly fitting with the inner wall of the piston chamber, and the small-diameter section constitutes the insertion section.

4. The hydraulic control valve according to claim 2 or 3, characterized in that, A chamfer structure is provided at the end of the insertion section.

5. The hydraulic control valve according to any one of claims 1 to 3, characterized in that The valve body includes a main valve body and a cylinder block connected to the main valve body. The cylinder block and the main valve body jointly enclose the piston chamber.

6. The hydraulic control valve according to any one of claims 1 to 3, characterized in that The striker is separately provided from the piston body.

7. The hydraulic control valve according to any one of claims 1 to 3, characterized in that, The striker has a small-diameter section for being arranged close to the valve core and a large-diameter section for being arranged away from the valve core.

8. The hydraulic control valve according to any one of claims 1 to 3, characterized in that, The piston body and the inner wall of the piston chamber are sealingly fitted through a sealing ring. An annular groove for installing the sealing ring is provided on the outer peripheral surface of the piston body.

9. A hydraulic operating mechanism, including a hydraulic control valve, characterized in that, The hydraulic control valve is the same as the hydraulic control valve described in any one of claims 1 to 8.

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