High-precision one-way valve

Abstract

The invention discloses a high-precision one-way valve, and relates to the technical field of one-way valves. A valve core; the valve element is arranged in the valve body in a sliding mode and located on the upper portion of the valve body; the liquid inlet is horizontally formed in the valve body and located on one side of the valve element; the liquid outlet is horizontally formed in the valve body and located on the side, opposite to the liquid inlet, of the valve element; the control oil way is arranged on the lower portion of the valve body, and the tail end of the control oil way corresponds to the bottom of the valve element. The adjusting device is located on the upper portion of the valve body, and the adjusting device is arranged in the valve element in a sliding mode; the control device is fixed to the top of the valve body and connected with the adjusting device. The piston operation device is arranged at the lower part of the valve body and corresponds to the control oil path; by means of different transmission ratios of gears in the transmission gear set, the position of the valve element is precisely regulated and controlled at different rates, and unnecessary loss of the valve element is effectively avoided in the regulation and control process.

Description

Technical Field

[0001] The present invention relates to the technical field of one-way valves, and more particularly to a high-precision one-way valve. Background Art

[0002] A high-precision one-way valve is a valve used to control the one-way flow of fluids. It has the characteristics of high precision, high reliability and long life. It is widely used in industrial automation, chemical, pharmaceutical, food and other fields. In the biopharmaceutical production process, it is used to control the one-way flow of fluids such as drug raw materials and solvents to ensure the purity and safety of the production process. In chemical reactors, pipelines and other systems, it is used to accurately control the input and output of reactants to improve reaction efficiency and product quality. In industrial automation control systems, it is used as a key component in industrial automation control systems to achieve precise control and regulation of fluids. At present, once the oil pressure of the oil filling hole part of the one-way valve is fixed when the one-way valve is used, when the flow needs to be fine-tuned, the oil pressure needs to be controlled and adjusted. When the oil pressure is controlled and adjusted, it is difficult to accurately control the flow of the one-way valve, and deviations are prone to affect the flow control of the one-way valve, thereby affecting the safety of the one-way valve delivery. In addition, if the position of the valve core is adjusted under a fixed oil pressure, the interaction between the valve core and the oil pressure is likely to cause loss to the valve core and related connectors, shortening the service life of the components, high energy consumption, and high cost. Therefore, it is necessary to provide a high-precision one-way valve to solve the problems raised in the above background technology. Summary of the invention

[0003] To achieve the above object, the present invention provides the following technical solution: a high-precision one-way valve, comprising: Valve body; A valve core is slidably disposed inside the valve body, and the valve core is located at the upper part of the valve body; The liquid inlet is horizontally arranged on the valve body and located on one side of the valve core; The liquid outlet is horizontally arranged on the valve body and is located on the side of the valve core opposite to the liquid inlet; A control oil circuit is arranged at the lower part of the valve body, and the end of the control oil circuit corresponds to the bottom of the valve core; An adjusting device is located at the upper part of the valve body, and the adjusting device is slidably arranged inside the valve core; A control device, fixed on the top of the valve body and connected to the regulating device; The piston operating device is arranged at the lower part of the valve body and corresponds to the control oil circuit.

[0004] Preferably, the control device comprises: A fixed shell is fixed on the top of the valve body; A driving threaded shaft is rotatably disposed in the fixed housing, and the bottom of the driving threaded shaft passes through the fixed housing and is threadedly connected to the adjusting device; An adjusting shaft is arranged parallel to the driving threaded shaft, and the adjusting shaft is rotatably arranged in the fixed housing; Transmission gear sets, with multiple sets distributed vertically, connecting the driving threaded shaft and the adjusting shaft; The control mechanism is vertically distributed with multiple groups, which are arranged corresponding to the transmission gear groups, and the control mechanism is slidably arranged on the adjustment shaft.

[0005] Preferably, the adjusting device comprises: A connecting plate is slidably arranged inside the valve core; The first telescopic shaft is composed of a telescopic inner shaft and a telescopic outer shaft, and is fixedly connected to the bottom of the connecting plate and the inner wall of the valve core respectively; A first compression spring is arranged inside the valve core, below the connecting plate, and sleeved on the first telescopic shaft; The threaded sleeve is fixed on the top of the connecting plate, and the top of the threaded sleeve is connected to the control device.

[0006] Preferably, a side portion of the fixed housing is provided with a limiting groove corresponding to the control mechanism.

[0007] Preferably, a rotating gear is fixed to the top of the adjusting shaft, and the rotating gear is arranged on the top of the fixed shell.

[0008] Preferably, the transmission gear set comprises: A driving gear, fixed on the driving threaded shaft; The connecting gear is rotatably arranged on the adjusting shaft and connected to the control mechanism. The connecting gear is meshed with the driving gear, and the transmission ratios of the connecting gear and the driving gear in each group of the transmission gear sets are different.

[0009] Preferably, the control mechanism comprises: A snap ring is slidably disposed on the adjusting shaft, and the snap ring is slidably connected to the connecting gear; The toggle rod has one end sleeved on the clamping ring and the other end corresponding to the limiting groove on the fixed shell, and the clamping ring is rotatably connected to the toggle rod.

[0010] Preferably, the piston operation device comprises: The movable chamber is fixed at the lower part of the valve body and corresponds to the control oil circuit; A piston body is slidably disposed in the movable chamber; The push-adjusting assembly is arranged in the piston body, and the top of the push-adjusting assembly corresponds to the bottom of the valve core.

[0011] Preferably, the push adjustment component comprises: An adjusting chamber is arranged inside the piston body; A closed connection surface is slidably disposed in the adjustment cavity; The second telescopic shaft, consisting of a telescopic inner shaft and a telescopic outer shaft, is fixedly connected to the bottom of the closed connection surface and the inner wall of the adjustment cavity respectively; A second compression spring is arranged inside the adjustment cavity, below the closed connection surface, and sleeved on the second telescopic shaft; The driving shaft is fixed on the top of the closed connection surface and is slidably connected with the top of the piston body, and the top of the driving shaft corresponds to the bottom of the valve core.

[0012] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the position of the valve core is controlled and adjusted by setting the adjusting device, and when the oil pressure is fixed, the position of the valve core is fine-tuned or quickly adjusted by setting the control device; the position of the valve core is accurately adjusted at different rates by different transmission ratios of the gears in the transmission gear group; the position of the valve core is moved and adjusted by the mutual cooperation of the second compression spring in the piston operating device and the first compression spring in the adjusting device, so as to avoid direct impact of the valve core against the oil pressure during the movement and adjustment process, which would cause unnecessary losses to the valve core and the piston operating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structural diagram of the high-precision one-way valve; Figure 2 It is a schematic diagram of the structure of the regulating device and the control device in the present invention; Figure 3 It is a schematic diagram of the structure of the transmission gear set and the control mechanism in the present invention; Figure 4 It is a structural schematic diagram of the piston operating device in the present invention; Figure 5 It is a structural schematic diagram of the push adjustment component in the present invention; In the figure: 1. valve body; 2. valve core; 3. liquid inlet; 4. liquid outlet; 5. control oil circuit; 6. adjusting device; 7. control device; 8. piston operation device; 61. connecting plate; 62. first telescopic shaft; 63. first compression spring; 64. threaded sleeve; 71. fixed shell; 72. driving threaded shaft; 73. adjusting shaft; 74. transmission gear set; 75. control mechanism; 81. movable chamber; 82. piston body; 83. pushing and adjusting assembly; 711. limiting groove; 731. rotating gear; 741. driving gear; 742. connecting gear; 751. retaining ring; 752. toggle rod; 831. adjusting chamber; 832. closed connecting surface; 833. second telescopic shaft; 834. second compression spring; 835. pushing shaft. DETAILED DESCRIPTION

[0014] See also Figure 1-Figure 5 In an embodiment of the present invention, a high-precision one-way valve comprises: Valve body 1; The valve core 2 is slidably disposed inside the valve body 1, and the valve core 2 is located at the upper part of the valve body 1; The liquid inlet 3 is horizontally arranged on the valve body 1 and is located on one side of the valve core 2; The liquid outlet 4 is horizontally arranged on the valve body 1 and is located on the side of the valve core 2 opposite to the liquid inlet 3; A control oil circuit 5 is provided at the lower part of the valve body 1, and the end of the control oil circuit 5 corresponds to the bottom of the valve core 2; The regulating device 6 is located at the upper part of the valve body 1, and the regulating device 6 is slidably arranged inside the valve core 2; The control device 7 is fixed on the top of the valve body 1 and connected to the regulating device 6; The piston operating device 8 is arranged at the lower part of the valve body 1 and corresponds to the control oil circuit 5 .

[0015] In this embodiment, the adjusting device 6 comprises: The connecting plate 61 is slidably disposed inside the valve core 2; The first telescopic shaft 62, consisting of a telescopic inner shaft and a telescopic outer shaft, is fixedly connected to the bottom of the connecting plate 61 and the inner wall of the valve core 2 respectively; A first compression spring 63 is arranged inside the valve core 2, below the connecting plate 61, and sleeved on the first telescopic shaft 62; The threaded sleeve 64 is fixed on the top of the connecting plate 61 , and the top of the threaded sleeve 64 is connected to the control device 7 .

[0016] That is to say, in the initial state of the adjusting device 6, since the threaded sleeve 64 and the connecting plate 61 are restricted by the control device 7 and remain in a fixed state, under the action of the first compression spring 63, the valve core 2 is pushed out from the upper part of the valve body 1, and the connecting channel between the liquid inlet 3 and the liquid outlet 4 is closed. When the piston operating device 8 moves to the position of the valve core 2 under the action of the control oil circuit 5, the valve core 2 is pushed to move into the valve body 1 through the piston operating device 8, and the first compression spring 63 is compressed. When the oil pressure in the control oil circuit 5 remains fixed, the position of the valve core 2 remains fixed, and the solution is transported. It should be noted that the valve core 2 is only slidably connected to the valve body 1 and cannot rotate in the valve body 1, and the connecting plate 61 is only slidably connected to the inner wall of the valve core 2 and cannot rotate inside the valve core 2.

[0017] In this embodiment, the control device 7 includes: A fixed housing 71 is fixed on the top of the valve body 1; A driving threaded shaft 72 is rotatably disposed in the fixed housing 71, and the bottom of the driving threaded shaft 72 passes through the fixed housing 71 and is threadedly connected to the adjusting device 6; The adjusting shaft 73 is arranged parallel to the driving threaded shaft 72, and the adjusting shaft 73 is rotatably arranged in the fixed housing 71; A transmission gear set 74, which is vertically distributed with multiple sets, connects the driving threaded shaft 72 and the adjusting shaft 73; The control mechanism 75 is vertically distributed and has multiple groups, which are arranged corresponding to the transmission gear group 74, and the control mechanism 75 is slidably arranged on the adjustment shaft 73.

[0018] That is to say, under the pushing action of the piston operating device 8, the valve core 2 maintains a fixed position, and at this time the first compression spring 63 is in a compressed state. When the driving threaded shaft 72 rotates forward in the threaded sleeve 64, under the restriction of the connecting disk 61 and the valve core 2, the threaded sleeve 64 is driven to move in the direction of the first compression spring 63. While compressing the first compression spring 63, the valve core 2 is driven to move on the valve body 1 in the direction of the piston operating device 8, pushing the piston operating device 8 to move, so that the flow rate of the one-way valve becomes smaller; when the driving threaded shaft 72 is reversed in the threaded sleeve 64, under the restriction of the connecting disk 61 and the valve core 2, the threaded sleeve 64 is driven to move in the direction away from the first compression spring 63, and the first compression spring 63 is further relaxed. Under the interaction of the piston operating device 8, the valve core 2 moves on the valve body 1 in the direction away from the piston operating device 8, so that the flow rate of the one-way valve becomes larger.

[0019] It should also be noted that under the control of the adjusting shaft 73, the rotation speed of the driving threaded shaft 72 is adjusted through different transmission gear sets 74. At the same rotation speed of the adjusting shaft 73, the transmission gear set 74 can drive the threaded shaft 72 to have different rotation speeds. By driving the threaded shaft 72 at different rotation speeds in the threaded sleeve 64, the position of the valve core 2 can be precisely adjusted.

[0020] In this embodiment, a limiting groove 711 corresponding to the control mechanism 75 is provided on the side of the fixed housing 71 .

[0021] In this embodiment, a rotating gear 731 is fixed to the top of the adjusting shaft 73 , and the rotating gear 731 is disposed on the top of the fixed housing 71 .

[0022] In this embodiment, the transmission gear set 74 includes: A driving gear 741 is fixed on the driving threaded shaft 72; The connecting gear 742 is rotatably disposed on the adjusting shaft 73 and connected to the control mechanism 75. The connecting gear 742 is meshed with the driving gear 741, and the transmission ratios of the connecting gear 742 and the driving gear 741 in each group of the transmission gear set 74 are different.

[0023] That is to say, the adjusting shaft 73 is driven to rotate by the rotating gear 731, at which time the connecting gear 742 is rotatably connected with the adjusting shaft 73, that is, the adjusting shaft 73 rotates alone, and then a suitable transmission gear set 74 is selected according to the demand for flow control of the one-way valve, and the corresponding connecting gear 742 is fixedly connected to the adjusting shaft 73 through the control mechanism 75, and then the connecting gear 742 is driven to rotate by the adjusting shaft 73, and then the driving threaded shaft 72 is driven to rotate by the driving gear 741 to adjust the position of the valve core 2. When the flow rate of the one-way valve is to be adjusted over a large range, a transmission gear set 74 with a transmission ratio less than 1 can be selected to increase the rotation speed of the driving gear 741 and quickly adjust the position of the valve core 2. When it is adjusted to near the required position, a transmission gear set 74 with a transmission ratio greater than 1 can be used to reduce the rotation speed of the driving gear 741 and accurately move the position of the valve core 2. When the flow rate of the one-way valve needs to be adjusted over a small range, a transmission gear set 74 with a transmission ratio greater than 1 can be directly used to reduce the rotation speed of the driving gear 741 and accurately move the position of the valve core 2.

[0024] In this embodiment, the control mechanism 75 includes: A snap ring 751 is slidably disposed on the adjusting shaft 73, and the snap ring 751 is slidably connected to the connecting gear 742; One end of the toggle rod 752 is sleeved on the clamping ring 751 , and the other end corresponds to the limiting groove 711 on the fixed shell 71 , and the clamping ring 751 is rotatably connected to the toggle rod 752 .

[0025] That is to say, the toggle rod 752 moves in the limit groove 711, and at the same time drives the retaining ring 751 to move on the adjusting shaft 73. By moving the toggle rod 752 corresponding to the different transmission gear sets 74, the retaining ring 751 is clamped between the connecting gear 742 and the adjusting shaft 73, and the connecting gear 742 is driven to rotate through the adjusting shaft 73, and then the driving threaded shaft 72 is driven to rotate through the driving gear 741 to adjust the position of the valve core 2.

[0026] In this embodiment, the piston operation device 8 includes: The movable chamber 81 is fixed at the lower part of the valve body 1 and corresponds to the control oil circuit 5; The piston body 82 is slidably disposed in the movable chamber 81; The push-adjustment assembly 83 is disposed in the piston body 82 , and the top of the push-adjustment assembly 83 corresponds to the bottom of the valve core 2 .

[0027] That is to say, under the action of the pressure of the control oil circuit 5, the piston body 82 is pushed to move in the active chamber 81 toward the direction of the valve core 2, and then under the interaction of the valve core 2, the push-adjusting component 83 is contracted, and at the same time, the regulating device 6 inside the valve core 2 is also contracted, that is, while the push-adjusting component 83 and the regulating device 6 are contracted synchronously, the valve core 2 moves toward the inside of the valve body 1 to open the channel between the liquid inlet 3 and the liquid outlet 4.

[0028] In this embodiment, the push adjustment component 83 includes: The regulating chamber 831 is arranged inside the piston body 82; The closed connection surface 832 is slidably disposed in the adjustment cavity 831; The second telescopic shaft 833, consisting of a telescopic inner shaft and a telescopic outer shaft, is fixedly connected to the bottom of the closed connection surface 832 and the inner wall of the adjustment cavity 831 respectively; The second compression spring 834 is disposed inside the adjustment cavity 831, below the closed connection surface 832, and sleeved on the second telescopic shaft 833; The driving shaft 835 is fixed on the top of the closed connection surface 832 and is slidably connected to the top of the piston body 82 , and the top of the driving shaft 835 corresponds to the bottom of the valve core 2 .

[0029] That is to say, when the piston body 82 drives the push regulating assembly 83 to move toward the position of the valve core 2, after the push shaft 835 contacts the valve core 2, under the action of continuous thrust, the second compression spring 834 is compressed inside the regulating chamber 831, and the first compression spring 63 is compressed inside the valve core 2, and then the valve core 2 moves toward the inside of the valve body 1, opening the channel between the liquid inlet 3 and the liquid outlet 4. When it is necessary to adjust the flow of the one-way valve, under the condition that the oil pressure of the control oil circuit 5 remains unchanged, when the flow of the one-way valve is increased, the control driving threaded shaft 72 is reversed in the threaded sleeve 64, and under the restriction of the connecting plate 61 and the valve core 2, the threaded sleeve 64 is driven to move in the direction away from the first compression spring 63, and the first compression spring 63 is further relaxed. At this time, the second compression spring 63 is The resistance of the spring 834 becomes smaller, and the second compression spring 834 extends, driving the push shaft 835 to move toward the valve core 2, pushing the valve core 2 to move on the valve body 1 in the direction away from the piston operating device 8, thereby increasing the flow of the one-way valve; conversely, when the flow of the one-way valve is reduced, the driving threaded shaft 72 is controlled to rotate forward in the threaded sleeve 64, and under the restriction of the connecting plate 61 and the valve core 2, the threaded sleeve 64 is driven to move in the direction of the first compression spring 63, and the first compression spring 63 is further compressed. At this time, the resistance of the second compression spring 834 becomes larger, and the second compression spring 834 is further compressed, driving the push shaft 835 to move to a position away from the valve core 2, and pushing the valve core 2 to move on the valve body 1 in the direction close to the piston operating device 8, thereby reducing the flow of the one-way valve.

[0030] In the specific implementation, first, under the pressure of the control oil circuit 5, the piston body 82 is pushed to move in the active chamber 81 toward the direction of the valve core 2, and then under the interaction of the valve core 2, the second compression spring 834 is compressed inside the adjustment chamber 831, and the first compression spring 63 is compressed inside the valve core 2, and then the valve core 2 moves toward the inside of the valve body 1, opening the channel between the liquid inlet 3 and the liquid outlet 4. When it is necessary to adjust the flow of the one-way valve, under the condition that the oil pressure of the control oil circuit 5 remains unchanged, the control device 7 is used to control the drive The threaded shaft 72 rotates forward in the threaded sleeve 64, and under the restriction of the connecting plate 61 and the valve core 2, the threaded sleeve 64 is driven to move in the direction of the first compression spring 63, and the first compression spring 63 is further compressed. At this time, the resistance of the second compression spring 834 becomes larger, and the second compression spring 834 is further compressed, driving the driving shaft 835 to move away from the valve core 2, and pushing the valve core 2 on the valve body 1 to move in the direction close to the piston operating device 8, so that the flow of the one-way valve becomes smaller. On the contrary, the control device 7 is controlled The driving threaded shaft 72 is reversed in the threaded sleeve 64, and under the restriction of the connecting plate 61 and the valve core 2, the threaded sleeve 64 is driven to move in the direction away from the first compression spring 63, and the first compression spring 63 is further relaxed. At this time, the resistance of the second compression spring 834 becomes smaller, and the second compression spring 834 is extended, driving the driving shaft 835 to move toward the valve core 2, and pushing the valve core 2 on the valve body 1 to move away from the piston operating device 8, so that the flow of the one-way valve becomes larger. When the flow of the one-way valve is regulated, The toggle rod 752 corresponding to the transmission gear set 74 of different transmission ratios is moved to clamp the retaining ring 751 between the connecting gear 742 and the adjusting shaft 73. The connecting gear 742 is driven to rotate by the adjusting shaft 73, and then the driving gear 741 drives the driving threaded shaft 72 to rotate. The rotation speed of the driving threaded shaft 72 in the threaded sleeve 64, that is, the movement speed of the threaded sleeve 64 inside the valve core 2, is precisely controlled to precisely adjust the position of the valve core 2, so as to achieve accurate control of the flow of the one-way valve.

[0031] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. High precision one-way valve, characterized in that: include: Valve body (1); A valve core (2) is slidably arranged inside the valve body (1), and the valve core (2) is located at the upper part of the valve body (1); A liquid inlet (3) is horizontally arranged on the valve body (1) and is located on one side of the valve core (2); The liquid outlet (4) is horizontally arranged on the valve body (1) and is located on a side of the valve core (2) opposite to the liquid inlet (3); A control oil circuit (5) is arranged at the lower part of the valve body (1), and the end of the control oil circuit (5) corresponds to the bottom of the valve core (2); An adjusting device (6) is located on the upper part of the valve body (1), and the adjusting device (6) is slidably arranged inside the valve core (2); A control device (7) is fixed to the top of the valve body (1) and is connected to the regulating device (6); A piston operating device (8) is arranged at the lower part of the valve body (1) and corresponds to the control oil circuit (5); The control device (7) comprises: A fixed housing (71) fixed to the top of the valve body (1); A driving threaded shaft (72) is rotatably disposed in the fixed housing (71), and the bottom of the driving threaded shaft (72) passes through the fixed housing (71) and is threadably connected to the adjusting device (6); An adjusting shaft (73) is arranged parallel to the driving threaded shaft (72), and the adjusting shaft (73) is rotatably arranged in the fixed housing (71); A transmission gear set (74), with a plurality of sets arranged vertically, connecting the driving threaded shaft (72) and the adjusting shaft (73); The control mechanisms (75) are vertically distributed and provided in multiple groups, and are arranged corresponding to the transmission gear groups (74). The control mechanisms (75) are slidably arranged on the adjustment shaft (73).

2. The high-precision one-way valve according to claim 1, characterized in that: The regulating device (6) comprises: A connecting plate (61) slidably disposed inside the valve core (2); A first telescopic shaft (62), composed of a telescopic inner shaft and a telescopic outer shaft, and fixedly connected to the bottom of the connecting plate (61) and the inner wall of the valve core (2) respectively; A first compression spring (63) is arranged inside the valve core (2), located below the connecting plate (61), and sleeved on the first telescopic shaft (62); The threaded sleeve (64) is fixed on the top of the connecting plate (61), and the top of the threaded sleeve (64) is connected to the control device (7).

3. The high-precision one-way valve according to claim 1, characterized in that: A limiting groove (711) corresponding to the control mechanism (75) is provided on the side of the fixed housing (71).

4. The high-precision one-way valve according to claim 3, characterized in that: A rotating gear (731) is fixed to the top of the adjusting shaft (73), and the rotating gear (731) is arranged on the top of the fixed housing (71).

5. The high-precision one-way valve according to claim 4, characterized in that: The transmission gear set (74) comprises: A driving gear (741) fixed on the driving threaded shaft (72); A connecting gear (742) is rotatably disposed on the adjusting shaft (73) and is connected to the control mechanism (75); the connecting gear (742) is meshed with the driving gear (741), and the transmission ratios of the connecting gear (742) and the driving gear (741) in each group of the transmission gear sets (74) are different.

6. The high-precision one-way valve according to claim 5, characterized in that: The control mechanism (75) comprises: A snap ring (751) is slidably disposed on the adjustment shaft (73), and the snap ring (751) is slidably connected to the connecting gear (742); One end of the toggle rod (752) is sleeved on the clamping ring (751), and the other end corresponds to the limiting groove (711) on the fixed housing (71), and the clamping ring (751) is rotatably connected to the toggle rod (752).

7. The high-precision one-way valve according to claim 1, characterized in that: The piston operating device (8) comprises: The movable chamber (81) is fixed at the lower part of the valve body (1) and corresponds to the control oil circuit (5); A piston body (82) is slidably disposed in the movable chamber (81); The push-adjusting assembly (83) is arranged in the piston body (82), and the top of the push-adjusting assembly (83) corresponds to the bottom of the valve core (2).

8. The high-precision one-way valve according to claim 7, characterized in that: The push adjustment component (83) comprises: An adjusting chamber (831) is arranged inside the piston body (82); A closed connection surface (832) slidably disposed in the adjustment cavity (831); The second telescopic shaft (833) is composed of a telescopic inner shaft and a telescopic outer shaft, and is respectively fixedly connected to the bottom of the closed connection surface (832) and the inner wall of the adjustment cavity (831); A second compression spring (834) is arranged inside the adjustment cavity (831), is located below the closed connection surface (832), and is sleeved on the second telescopic shaft (833); The driving shaft (835) is fixed on the top of the closed connection surface (832) and is slidably connected to the top of the piston body (82), and the top of the driving shaft (835) corresponds to the bottom of the valve core (2).

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