A valve actuator

Abstract

The application discloses a valve actuator, which comprises a shell and a driving assembly, wherein the driving assembly comprises a pressure trigger device, an oil pump device and a driving rod which are sequentially connected; the pressure trigger device comprises a sealing cover structure and a driving diaphragm which are connected and arranged in a pressure cavity; the driving diaphragm divides the pressure cavity into an upper chamber and a lower chamber; the sealing cover structure is provided with an oil guide channel which is connected with the lower chamber and an upper oil cavity; a one-way valve structure is arranged in the oil guide channel; the insulating oil in the lower oil cavity is continuously injected into the oil guide channel by the oil pump device, and the one-way valve structure is opened, so that the insulating oil is transported into the upper oil cavity through the oil guide channel. The valve actuator adopts a hydraulic driving mode to automatically open the valve, has good silence and controllability, has a simple transmission structure and is easy to maintain and repair, and uses oil as a transmission medium, thereby prolonging the service life of the product and components and facilitating automatic control of the valve.

Description

Technical Field

[0001] This invention relates to the field of valve control technology, and more specifically to a valve actuator. Background Technology

[0002] Valves are devices used in fluid systems to control the direction, pressure, and flow rate of fluids. Among them, gas valves, as safety accessories for gas pipeline projects, are used to cut off, connect, and regulate the gas in the pipeline. They have good control characteristics and sealing performance and are suitable for pipelines carrying various gas media such as city gas, liquefied petroleum, natural gas, and oxygen.

[0003] Many valves on the market only contain core components such as the valve body, valve core, and closing spring. Lacking an electromagnetic mechanism, they lack automatic opening functionality, especially for gas valves with high starting pressures. The electromagnetic mechanism's power is insufficient for opening, requiring a very large mechanism, which is prohibitively expensive. Therefore, to achieve automated control of gas valves in gas pipeline projects, gas actuators are currently used to replace traditional manual operation. Gas actuators receive control signals from the controller and are used for automatic valve opening control. Pneumatic actuators are the most common type of gas actuator on the market. They are widely used due to their air-driven operation, explosion-proof features, high driving torque, and long service life. However, existing pneumatic actuators generate significant noise during operation due to the connection to the air source and their internal mechanical movement. Furthermore, the gears and racks in the internal mechanical transmission structure are prone to wear after prolonged use, requiring frequent maintenance and replacement, thus affecting product lifespan and increasing maintenance costs. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of existing pneumatic actuators generating large noise during operation and the internal mechanical transmission structure being prone to large wear, requiring frequent maintenance and replacement, which affects the service life of the product. In order to provide a valve actuator with high output power, good controllability and quietness, improved product service life, and easy realization of valve automation control.

[0005] To solve the above-mentioned technical problems, the present invention provides a valve actuator, comprising:

[0006] The casing has an upper oil chamber and a lower oil chamber that are sealed and separated from each other.

[0007] A drive assembly, movably disposed between an upper oil chamber and a lower oil chamber, comprises a pressure triggering device, an oil pump device, and a drive rod arranged sequentially, the drive rod being connected to a valve; characterized in that:

[0008] The pressure triggering device includes a pressure chamber and a sealing cover structure and a driving diaphragm connected in the pressure chamber. The driving diaphragm divides the pressure chamber into an upper chamber and a lower chamber. A pressure relief port communicating with the upper oil chamber is opened on the top side of the upper chamber. The pressure relief port is disposed opposite to the sealing cover structure. The sealing cover structure is provided with a pressure relief port communicating with the lower chamber and the upper oil chamber. A one-way valve structure closed at one end of the oil guide channel is provided in the oil guide channel. When the pressure in the lower chamber is greater than the pressure in the upper chamber, the driving diaphragm drives the sealing cover structure to move upward and close the pressure relief port.

[0009] The oil pump device is used to press the insulating oil in the lower oil chamber into the oil guide channel through the lower chamber, and inject it into the upper oil chamber through the top-opening one-way valve structure. When the pressure in the upper oil chamber is greater than that in the lower oil chamber, it pushes the drive component to move down and open the valve.

[0010] In the aforementioned valve actuator, the sealing cover structure includes a cup-shaped sealing cover and a valve core seat disposed on the top of the cup-shaped sealing cover. The oil guide channel extends axially along the valve core seat and passes through the valve core seat and the cup-shaped sealing cover. The one-way valve structure is disposed in the valve core seat, and the valve core seat extends into the pressure relief port. A sleeve fitted on the outside of the valve core seat is disposed in the pressure relief port. The cup-shaped sealing cover is linked and cooperates with the drive diaphragm, and is used to open or close the pressure relief port under the drive of the drive diaphragm.

[0011] In the valve actuator described above, the sealing cover structure further includes a T-shaped limiting member disposed at the bottom of the bowl-shaped sealing cover. The T-shaped limiting member has a central through hole that connects to the oil guide channel. The inner periphery of the driving diaphragm is sealed and installed between the bowl-shaped sealing cover and the T-shaped limiting member, and the outer periphery of the driving diaphragm is sealed and connected to the inner wall of the pressure chamber.

[0012] In the aforementioned valve actuator, the bowl-shaped sealing cover includes an annular step disposed within the oil guide channel, and one end of the T-shaped limiting member is provided with a mounting hook that engages with the annular step.

[0013] In the valve actuator described above, the one-way valve structure includes a first one-way valve core and a first spring connected and disposed in a valve core seat. The upper end of the valve core seat is provided with a tapered opening. The upper end of the first one-way valve core is provided with a tapered portion adapted and connected to the tapered opening. One end of the first spring is connected to the lower end of the first one-way valve core, and the other end is limited and abutted against the lower end of the valve core seat. The first one-way valve core drives the tapered portion to seal and close the tapered opening under the elastic force of the first spring.

[0014] In the aforementioned valve actuator, the pressure triggering device includes a sealing seat connected to the oil pump device to form the pressure chamber, and a sealing cover sleeved on the outside of the sealing seat. The pressure relief port is formed on the top of the sealing seat, and a sealing gasket is embedded around the pressure relief port on the sealing seat. The top of the cup-shaped sealing cover is provided with an annular protrusion that is in close contact with the sealing gasket. A sealing ring is provided between the sealing seat and the oil pump device.

[0015] In the valve actuator described above, an oil draining structure is provided between the sealing cover, the sealing seat, and the upper chamber. The oil draining structure includes: multiple oil drain holes that penetrate the side wall of the sealing seat and connect to the upper chamber, and an oil draining gap provided between the sealing cover and the sealing seat. The oil draining gap connects the oil drain holes and the lower oil chamber.

[0016] In the valve actuator described above, an oil seal is provided between the sealing cover and the housing to divide the internal space of the housing into an upper oil chamber and a lower oil chamber.

[0017] In the valve actuator described above, the lower chamber is provided with a filter screen located below the drive diaphragm, and a limiting ring for limiting the filter screen is installed in the lower chamber.

[0018] In the aforementioned valve actuator, the oil pump device includes:

[0019] A coil assembly having a central cavity formed therein;

[0020] The iron core assembly includes two stationary iron cores disposed at both ends of the central cavity, and a plunger body reciprocally disposed between the two stationary iron cores, wherein two plunger springs are respectively provided between the plunger body and the two stationary iron cores;

[0021] The oil pipe assembly extends axially along the central cavity and passes between the two stationary iron cores and the plunger body. When the oil pump device is working, it draws the insulating oil from the lower oil chamber into the upper chamber through the oil pipe assembly.

[0022] In the aforementioned valve actuator, the oil pipe assembly includes an upper oil pipe and a lower oil pipe fixedly inserted into the plunger body along the axial direction. The upper oil pipe extends out of one end of the plunger body and slides through one of its stationary iron cores. The lower oil pipe extends out of the other end of the plunger body and slides through the other stationary iron core. A sliding sleeve structure is provided between the upper oil pipe and the lower oil pipe and the two stationary iron cores respectively. A second one-way valve core and a second spring are provided between the upper oil pipe and the lower oil pipe. The second spring drives the second one-way valve core to match and press against the port of the lower oil pipe. The upper oil pipe is used to connect to the upper chamber.

[0023] In the aforementioned valve actuator, the drive rod is connected to a stationary iron core located at the lower end of the coil assembly. The drive rod is provided with an oil inlet hole that connects to the lower oil chamber. The drive rod passes through the stationary iron core opposite to the lower oil pipe, and a connecting cavity is formed in the stationary iron core that connects the lower oil pipe and the oil inlet hole. A third one-way valve core and a third spring are connected in the connecting cavity. The third spring drives the third one-way valve core to match and press against the port of the oil inlet hole.

[0024] In the valve actuator described above, the drive rod is fitted with an external filter screen sleeve that surrounds the outside of the oil inlet.

[0025] The technical solution of this invention has the following advantages compared with the prior art:

[0026] 1. In the valve actuator provided by the present invention, the drive assembly consists of a pressure triggering device, an oil pump device, and a drive rod connected in sequence, and is movably disposed as a whole between the upper and lower oil chambers of the housing. When energized, the oil pump device continuously injects insulating oil from the lower oil chamber into the lower chamber and guide channel of the pressure triggering device. At this time, the pressure in the lower chamber is greater than the pressure in the upper chamber, causing the drive diaphragm to move the sealing cover structure to close the pressure relief port under the action of the pressure difference. At the same time, the one-way valve structure in the guide channel is pushed open under the action of oil pressure, and the lower chamber and the upper oil chamber are connected through the oil guide channel. Thus, under the continuous oil supply operation of the oil pump device, the insulating oil in the lower oil chamber is transported to the upper oil chamber through the oil guide channel until the pressure in the upper oil chamber increases to a critical range greater than that in the lower oil chamber, causing the entire drive assembly to drive the drive rod to move down rapidly under the push of oil pressure to open the valve. This valve actuator design uses hydraulic drive to automatically open the valve. Compared with traditional pneumatic actuators, it can provide higher power and is suitable for high-power gas valves. It can withstand large loads, has good quietness and controllability. Its transmission structure is simple and easy to maintain and repair. In addition, the actuator uses oil as the transmission medium, which can self-lubricate the relatively moving surfaces, which helps to extend the service life of the product and its components. Overall operation is convenient and easy to realize the automatic control of valves.

[0027] 2. In the valve actuator provided by this invention, an oil guide channel extends along the axis and is disposed between the valve core seat and the cup-shaped sealing cover. A one-way valve structure disposed in the oil guide channel is used to prevent backflow and leakage of the insulating oil medium. The valve core seat extends through the sleeve of the pressure relief port, and the sleeve guides the valve core seat, thereby guiding the movement of the cup-shaped sealing cover in the pressure chamber. After the cup-shaped sealing cover closes the pressure relief port, the insulating oil is pressurized by the oil pump device and transported to the oil guide channel. The one-way valve structure continuously transports the insulating oil to the upper oil chamber through the oil guide channel. Since the capacity of the insulating oil is fixed, it changes the pressure between the upper and lower oil chambers during this process. The increased pressure in the upper oil chamber acts on the drive assembly, ultimately causing the drive assembly to move downward under the pressure of the upper oil chamber, opening the valve through the drive rod.

[0028] 3. In the valve actuator provided by the present invention, the sealing cover structure mainly consists of a bowl-shaped sealing cover, a valve core seat, and a T-shaped limiting member. The inner periphery of the driving diaphragm is installed and connected between the T-shaped limiting member and the bowl-shaped sealing cover. The T-shaped limiting member limits the installation of the driving diaphragm on the bowl-shaped sealing cover, making installation convenient and quick, and providing good installation stability. This allows the driving diaphragm and the bowl-shaped sealing cover to be assembled into an integrated structure. The driving diaphragm drives the bowl-shaped sealing cover to move up and down according to the pressure difference between the upper and lower chambers, thereby opening or closing the pressure relief port.

[0029] 4. In the valve actuator provided by the present invention, the one-way valve structure includes a first one-way valve core and a first spring connected and disposed in the valve core seat. The valve core seat has a tapered opening at its upper end, and the first one-way valve core has a corresponding tapered portion at its upper end that is adapted to and connected to the tapered opening. The advantage of this arrangement is that the first one-way valve core, under the elastic force of the first spring, drives the tapered portion to seal and close the tapered opening. At this time, the oil guide channel is in a closed and non-conductive state, preventing the insulating oil in the upper oil chamber from flowing back into the lower chamber through the guide channel. Only when the oil pump device is working is insulating oil continuously injected into the guide channel, causing the first one-way valve core to be pushed open under oil pressure, overcoming the force of the first spring, thereby opening the guide channel. Therefore, this first one-way valve core can quickly respond to and automatically adjust the flow direction of the fluid according to the pressure difference without external intervention, thus reliably preventing backflow of the fluid and ensuring the safety and normal operation of the actuator.

[0030] 5. In the valve actuator provided by the present invention, the pressure relief port is formed on the top of the sealing seat, and a sealing gasket is provided around the pressure relief port on the sealing seat. The top of the cup-shaped sealing cover is provided with an annular protrusion opposite to the sealing gasket. With this structure, the pressure in the lower pressure chamber gradually increases when the oil pump device is working. The diaphragm drives the cup-shaped sealing cover to move closer to the pressure relief port, thereby causing the annular protrusion on the cup-shaped sealing cover to press tightly against the sealing gasket. The sealing connection between the cup-shaped sealing cover and the sealing gasket achieves the sealing closure of the pressure relief port, preventing the insulating oil in the upper oil chamber from leaking and depressurizing from the pressure relief port. At this time, the oil pressure opens the one-way valve structure in the oil guide channel, thereby forming an oil supply path that connects the upper and lower oil chambers through the oil pipe, lower chamber, and oil guide channel of the oil pump device, ensuring the continuity and stability of the oil supply process.

[0031] 6. In the valve actuator provided by the present invention, when the valve actuator drives the drive assembly to move down and open the valve by hydraulic drive, the oil pump device also stops after power failure and no longer pressurizes the lower chamber. At this time, when the pressure in the upper chamber is greater than that in the lower chamber, the drive diaphragm drives the cup-shaped sealing cover to move down and open the pressure relief port, so that a part of the insulating oil in the upper oil chamber flows into the upper chamber through the pressure relief port, then flows into the oil relief gap between the sealing cover and the sealing seat through the oil drain hole, and finally seeps into the lower oil chamber. This realizes the power failure and pressure relief process of the valve actuator.

[0032] 7. In the valve actuator provided by the present invention, the filter screen is installed below the drive diaphragm by a limiting retaining ring, thereby limiting the installation of the filter screen. This structural setting allows the insulating oil to pass through a layer of filter screen when it is drawn from the lower oil chamber into the oil guide channel. The filter screen can effectively block and filter out impurities and large particles mixed in the insulating oil, so as to avoid these impurities and particles accumulating in the guide channel for a long time and causing blockage. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0034] Figure 1 A schematic cross-sectional view of the valve actuator provided by the present invention;

[0035] Figure 2 for Figure 1 The diagram shows the structure of the driving component.

[0036] Figure 3 for Figure 1 An enlarged schematic diagram of the pressure triggering device shown;

[0037] Figure 4This is a schematic diagram of the sealing cap structure of the present invention;

[0038] Figure 5 This is a schematic diagram of the mounting structure of the drive rod of the present invention;

[0039] Figure 6 This is a schematic diagram of the tubing assembly of the present invention;

[0040] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Upper oil chamber; 12. Lower oil chamber; 2. Pressure triggering device; 20. Pressure relief port; 21. Upper chamber; 22. Lower chamber; 23. Sleeve; 24. Sealing seat; 241. Sealing gasket; 242. Sealing ring; 25. Sealing cover; 26. Oil drain hole; 27. Oil drain gap; 28. Filter screen; 29. ​​Limiting retaining ring; 3. Oil pump device; 31. Coil assembly; 32. Stationary iron core; 33. Plunger body; 34. Sliding sleeve structure; 35. Oil pipe assembly; 351. Upper oil pipe; 352. Lower oil pipe; 36. Second one-way valve core; 37. Second spring; 38. Third one-way valve core; 39. Third spring; 4. Drive rod; 41. Oil inlet; 5. Sealing cover structure; 51. Bowl-shaped sealing cover; 52. Valve core seat; 53. T-shaped limiting component; 531. Mounting hook; 54. Conical opening; 55. Annular protrusion; 6. Drive diaphragm; 7. Oil guide channel; 8. One-way valve structure; 81. First one-way valve core; 82. Second spring; 83. Conical part; 9. Oil seal; 10. Sealing diaphragm assembly. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example

[0046] The following is a detailed description of this embodiment with reference to the accompanying drawings:

[0047] This embodiment provides, as follows: Figure 1-6 A valve actuator shown includes:

[0048] The housing 1 has an upper oil chamber 11 and a lower oil chamber 12 that are sealed and separated from each other.

[0049] The drive assembly is movably disposed between the upper oil chamber 11 and the lower oil chamber 12. It includes a pressure triggering device 2, an oil pump device 3 and a drive rod 4 arranged in sequence. The pressure triggering device 2 is mostly housed in the upper oil chamber 11, while the oil pump device 3 and the drive rod 4 are housed in the lower oil chamber 12. The drive rod 4 is connected to a valve.

[0050] The pressure triggering device 2 includes a pressure chamber, a sealing cover structure 5 connected to the pressure chamber, and a driving diaphragm 6. The driving diaphragm 6 divides the pressure chamber into an upper chamber 21 and a lower chamber 22. The top side of the upper chamber 21 has a pressure relief port 20 communicating with the upper oil chamber 11. The pressure relief port 20 is disposed opposite to the sealing cover structure 5. The sealing cover structure 5 has a pressure relief port 20 communicating with the lower chamber 22 and the upper oil chamber 11. The oil guide channel 7 is provided with a single valve that is closed at one end of the oil guide channel 7. The valve structure 8 is provided. When the valve actuator is energized, the oil pump device 3 pressurizes and pressurizes the insulating oil into the lower chamber 22. When the pressure in the lower chamber 22 is greater than the pressure in the upper chamber 21, the drive diaphragm 6 drives the sealing cover structure 5 to move upward and close the pressure relief port 20. The oil pump device 3 is used to press the insulating oil in the lower oil chamber 12 into the oil guide channel 7 through the lower chamber 22 and inject it into the upper oil chamber through the top-opening check valve structure. When the pressure in the upper oil chamber is greater than that in the lower oil chamber, it pushes the drive assembly to move downward and open the valve.

[0051] In the above embodiment, the drive assembly consists of a pressure triggering device 2, an oil pump device 3, and a drive rod 4 connected in sequence, and is movably disposed as a whole between the upper oil chamber 11 and the lower oil chamber 12 of the housing. When powered on, the oil pump device 3 continuously injects insulating oil from the lower oil chamber 12 into the lower chamber 22 and the guide channel of the pressure triggering device 2. At this time, the pressure in the lower chamber 22 is greater than the pressure in the upper chamber 21, causing the drive diaphragm 6 to move the sealing cover structure 5 to close the pressure relief port 20 under the action of the pressure difference. At the same time, the one-way valve structure 8 in the guide channel is pushed open under the action of oil pressure, and the lower chamber 22 is connected to the upper oil chamber 11 through the oil guide channel 7. Thus, under the continuous oil supply operation of the oil pump device, the insulating oil in the lower oil chamber 12 is transported to the upper oil chamber 11 through the oil guide channel 7 until the pressure in the upper oil chamber increases to a critical range greater than that in the lower oil chamber, causing the entire drive assembly to move the drive rod quickly downward under the push of oil pressure to open the valve. This valve actuator design uses hydraulic drive to automatically open the valve. Compared with traditional pneumatic actuators, it can provide higher power and is suitable for high-power gas valves. It can withstand large loads, has good quietness and controllability. Its transmission structure is simple and easy to maintain and repair. In addition, the actuator uses oil as the transmission medium, which can self-lubricate the relatively moving surfaces, which helps to extend the service life of the product and its components. Overall operation is convenient and easy to realize the automatic control of valves.

[0052] The following is in conjunction with the appendix Figure 1-4 A detailed description of the specific structure of the sealing cap is provided below:

[0053] The sealing cover structure 5 includes a bowl-shaped sealing cover 51 and a valve core seat 52 disposed on the top of the bowl-shaped sealing cover 51. The oil guiding channel 7 extends axially along the valve core seat 52 and passes through the valve core seat 52 and the bowl-shaped sealing cover 51. The one-way valve structure 8 is disposed in the valve core seat 52. The one-way valve structure 8 disposed in the oil guiding channel 7 is used to prevent the insulating oil medium from flowing back and leaking. The valve core seat 52 extends into the pressure relief port 20. A sleeve 23 is disposed in the pressure relief port 20 and is sleeved on the outside of the valve core seat 52. The sleeve 23 guides the valve core seat 52, thereby guiding the movement of the bowl-shaped sealing cover 51 in the pressure chamber and preventing the bowl-shaped sealing cover 51 from deflecting during movement. Further preferably, the bowl-shaped sealing cover 51 is linked with the driving diaphragm 6 and is used to open or close the pressure relief port 20 under the drive of the driving diaphragm 6. As can be seen from the above structure, after the pressure relief port is closed by the bowl-shaped sealing cover 51, the insulating oil is pressurized by the oil pump device 3 and transported to the oil guide channel 7. The insulating oil is continuously transported to the upper oil chamber 11 through the oil guide channel 7 by opening the one-way valve structure 8. Since the capacity of the insulating oil is constant, it plays a role in changing the pressure of the upper and lower oil chambers in this process. As the pressure of the upper oil chamber increases, it will exert an effect on the drive assembly, and finally the drive assembly will move down as a whole under the pressure of the upper oil chamber, and the valve will be opened by the drive rod 4.

[0054] like Figure 4 As shown, the sealing cover structure 5 also includes a T-shaped limiting member 53 disposed at the bottom of the bowl-shaped sealing cover 51. The T-shaped limiting member 53 has a central through hole that connects to the oil guiding channel 7. The bowl-shaped sealing cover 51 includes an annular step disposed in the oil guiding channel 7. One end of the T-shaped limiting member 53 is provided with a mounting hook 531 that abuts against the annular step. The mounting hook 531 and the annular step cooperate to achieve the installation and fixation between the bowl-shaped sealing cover 51 and the T-shaped limiting member 53, thereby sealing the inner periphery of the driving diaphragm 6 between the bowl-shaped sealing cover 51 and the T-shaped limiting member 53. The outer periphery of the driving diaphragm 6 is sealed to the inner wall of the pressure chamber, thereby dividing the pressure chamber into an upper chamber 21 and a lower chamber 22 by the driving diaphragm 6. This structural design uses a T-shaped limiting member 53 to limit the installation of the driving diaphragm 6 on the bowl-shaped sealing cover 51, making installation convenient, quick, and stable. This allows the driving diaphragm 6 and the bowl-shaped sealing cover 51 to be assembled into a single structure. The driving diaphragm moves the bowl-shaped sealing cover 51 up and down according to the pressure difference between the upper and lower chambers, thereby opening or closing the pressure relief port.

[0055] In a further preferred configuration, the one-way valve structure 8 includes a first one-way valve core 81 and a first spring 82 connected and disposed in a valve core seat 52. The upper end of the valve core seat 52 is provided with a tapered opening 54. The upper end of the first one-way valve core 81 is correspondingly provided with a tapered portion 83 adapted to and connected to the tapered opening 54. One end of the first spring 82 is connected to the lower end of the first one-way valve core 81, and its other end is limited and abutted against the lower end of the valve core seat 52. (Reference) Figure 4 A limiting gap is formed between the lower end of the valve core seat 52 and the annular step, and the other end of the first spring is made with a larger diameter so that it is precisely locked in the limiting gap to prevent it from coming out. The advantage of this design is that the first one-way valve core 81, under the elastic force of the first spring, drives the conical part 83 to seal and close the conical opening 54. At this time, the oil guide channel 7 is in a closed and non-conductive state, which can prevent the insulating oil in the upper oil chamber from flowing back to the lower chamber 22 through the guide channel. Only when the oil pump device is working, insulating oil is continuously injected into the oil guide channel 7, so that the first one-way valve core is pushed open by the oil pressure to overcome the force of the first spring, thereby realizing the opening of the guide channel. It can be seen that this first one-way valve core 81 can quickly respond to the pressure difference and automatically adjust the flow direction of the fluid without external intervention, thus reliably preventing the backflow of fluid and ensuring the safety and normal operation of the actuator.

[0056] In this embodiment, combined with Figure 1 and Figure 3As shown, the pressure triggering device 2 includes a sealing seat 24 connected to the oil pump device 3 to form the pressure chamber, and a sealing cover 25 sleeved on the outside of the sealing seat 24. The sealing cover 25 is provided with multiple oil storage grooves. An oil seal 9 is provided between the sealing cover 25 and the housing 1 to divide the internal space of the housing into an upper oil chamber 11 and a lower oil chamber 12. The pressure relief port 20 is formed on the top of the sealing seat 24. A sealing gasket 241 is embedded around the pressure relief port 20 on the sealing seat 24. The top of the cup-shaped sealing cover 51 is provided with an annular protrusion 55 that is in close contact with the sealing gasket 241. A sealing ring 242 is provided between the sealing seat 24 and the oil pump device 3. The sealing ring 242 is used to achieve a sealed installation between the sealing seat 24 and the oil pump device 3. The advantage of this design is that the pressure in the lower pressure chamber gradually increases when the oil pump device 3 is working. This pressure increases by driving the diaphragm 6 to move the cup-shaped sealing cover 51 closer to the pressure relief port 20. This causes the annular protrusion on the cup-shaped sealing cover 51 to press tightly against the sealing gasket 241. The sealing connection between the cup-shaped sealing cover 51 and the sealing gasket 241 seals and closes the pressure relief port 20, preventing the insulating oil in the upper oil chamber 11 from leaking and depressurizing from the pressure relief port 20. At this time, the oil pressure opens the one-way valve structure 8 in the oil guide channel, thus forming an oil supply path that connects the upper and lower oil chambers through the oil pipe of the oil pump device, the lower chamber 22, and the oil guide channel 7, ensuring the continuity and stability of the oil supply process.

[0057] This type of valve will de-energize and depressurize after the valve is opened. In order to facilitate the discharge of a portion of the insulating oil in the upper oil chamber 11 back into the lower oil chamber 12, an oil draining structure is provided between the sealing cover 25, the sealing seat 24, and the upper chamber 21. The oil draining structure includes: multiple oil drain holes 26 that are disposed through the side wall of the sealing seat 24 and connected to the upper chamber 21, and an oil draining gap 27 disposed between the sealing cover 25 and the sealing seat 24. The oil draining gap 27 connects the oil drain holes 26 and the lower oil chamber 12. As can be seen from the above, when the valve actuator moves the drive assembly downward to open the valve by hydraulic drive, the oil pump device 3 also stops being powered off and no longer pressurizes the lower chamber 22. At this time, when the pressure in the upper chamber 21 is greater than that in the lower chamber 22, the drive diaphragm 6 drives the bowl-shaped sealing cover 51 to move downward and open the pressure relief port 20, so that a part of the insulating oil in the upper oil chamber 11 flows into the upper chamber 21 through the pressure relief port 20, and then flows into the oil relief gap 27 between the sealing cover 25 and the sealing seat 24 through the oil drain hole 26, and finally seeps into the lower oil chamber 12. This realizes the power-off and pressure relief process of the valve actuator.

[0058] like Figure 3As shown, the lower chamber 22 is provided with a filter screen 28 located below the driving diaphragm 6, and a limiting ring 29 for limiting the filter screen 28 is installed in the lower chamber 22. The limiting ring 29 limits the installation of the filter screen 28. With this structure, when the insulating oil is drawn from the lower oil chamber 12 into the oil guiding channel 7, it first passes through a layer of filter screen 28. The filter screen 28 can effectively block and filter out impurities and large particles mixed in the insulating oil, so as to avoid these impurities and particles accumulating in the guiding channel for a long time and causing blockage.

[0059] The following is about the combination Figure 1-6 The specific configuration of the oil pump unit and drive rod is described in detail:

[0060] The oil pump device 3 includes a coil assembly 31, an iron core assembly, and an oil pipe assembly 35. The coil assembly 31 has a central cavity. The iron core assembly includes two stationary iron cores 32 located at both ends of the central cavity, and a plunger body 33 that is reciprocally disposed between the two stationary iron cores 32. Two plunger springs are respectively provided between the plunger body 33 and the two stationary iron cores 32. The oil pipe assembly 35 extends axially along the central cavity and passes between the two stationary iron cores 32 and the plunger body 33. When the oil pump device 3 is working, it draws the insulating oil from the lower oil chamber 12 into the upper chamber 21 through the oil pipe assembly 35. As a specific structural arrangement, the oil pipe assembly 35 includes an upper oil pipe 351 and a lower oil pipe 352 fixedly inserted axially through the plunger body 33. The upper oil pipe 351 extends out of one end of the plunger body 33 and slides through one of its stationary iron cores 32. The lower oil pipe 352 extends out of the other end of the plunger body 33 and slides through the other stationary iron core 32. Sliding sleeves are provided between the upper and lower oil pipes and the two stationary iron cores, respectively. These sliding sleeves support and guide the movement of the two oil pipes and, in conjunction with insulating oil, provide lubrication, thereby reducing frictional loss of the oil pipes. A second one-way valve core 36 and a second spring 8237 are provided between the upper oil pipe 351 and the lower oil pipe 352. The second spring 8237 drives the second one-way valve core 36 to press against the port of the lower oil pipe 352. The upper oil pipe 351 is used to connect to the upper chamber 21. The oil pump device 3 is installed between the pressure triggering device 2 and the drive rod 4, specifically as follows... Figure 2As shown in the figure, the stationary iron core 32 located at the upper end of the coil assembly 31 is installed and connected with the sealing seat 24. The drive rod 4 is connected to the stationary iron core 32 located at the lower end of the coil assembly 31. The drive rod 4 is provided with an oil inlet hole 41 connecting the lower oil chamber 12. The drive rod 4 and the lower oil pipe 352 are respectively inserted into the stationary iron core 32, and a connecting cavity connecting the lower oil pipe 352 and the oil inlet hole 41 is formed in the stationary iron core 32. A third one-way valve core 38 and a third spring 39 are connected in the connecting cavity. The third spring 39 drives the third one-way valve core 38 to match and press against the port of the oil inlet hole 41. A sealing diaphragm assembly 10 is provided in the housing 1 located on the bottom side of the lower oil chamber 12. The drive rod 4 passes through the sealing diaphragm assembly 10 and is connected to the valve core part of the valve. The sealing diaphragm assembly 10 seals the bottom opening of the lower oil chamber.

[0061] As can be seen from the above structure, the oil pump device 3 is equipped with two one-way valve cores. These two one-way valve cores are opened alternately during the reciprocating motion of the plunger body 33. When the plunger body 33 moves towards one of the stationary iron cores 32, a negative pressure appears in the cylinder. At this time, the third one-way valve core 38 is opened to draw the insulating oil in the lower oil chamber 12 into the lower oil pipe 352. When the plunger body 33 moves towards the other stationary iron core 32, the second one-way valve core 36 is opened, thereby compressing the insulating oil and drawing it into the upper oil pipe 351. Then, the continuously pressurized insulating oil enters the upper chamber 21 and the oil guide channel 7, pushing open the first one-way valve core 81, thereby injecting the insulating oil input from the upper oil pipe 351 into the upper oil chamber 11. This oil pump device 3 forms a continuous oil supply after the continuous movement of the plunger body 33, realizing the drawing of the insulating oil from the lower oil chamber 12 into the upper oil chamber 11.

[0062] The working principle of the valve actuator in this embodiment is explained below:

[0063] When the oil pump device 3 is energized and put into operation, the insulating oil in the lower oil chamber 12 is pressurized and transported through the oil inlet 41 and the oil pipe assembly 35 to the lower chamber 22 and the oil guide channel 7 of the pressure trigger device 2. When the pressure in the lower chamber 22 is greater than the pressure in the upper chamber 21, the driving diaphragm 6 drives the sealing cover structure 5 to move upward and close the pressure relief port 20. At this time, the one-way valve structure 8 is pushed open under the action of oil pressure, thereby opening the oil guide channel 7. Under the continuous oil supply operation of the oil pump device, the insulating oil in the lower oil chamber 12 is transported through the oil guide channel 7. Oil is continuously supplied to the upper oil chamber 11 via the oil channel 7. When the pressure in the upper oil chamber 11 increases to a critical range greater than that in the lower oil chamber 12, it pushes the entire drive assembly to move downwards rapidly and open the valve. After the valve opens, the oil pump device is then de-energized and stops working. Since the pressure in the upper chamber 21 is greater than that in the lower chamber 22, the pressure relief port 20 is opened by the downward movement of the sealing cover structure 5 to begin the pressure relief process. This allows a portion of the insulation in the upper oil chamber to flow back to the lower oil chamber through the drain hole and drain gap, thereby restoring the balance between the upper and lower oil chambers. When the valve closes under the action of its own closing spring, it pushes the entire drive assembly upwards to achieve the reset process.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A valve actuator, comprising: The housing (1) has an upper oil chamber (11) and a lower oil chamber (12) that are sealed and separated from each other. A drive assembly, movably disposed between an upper oil chamber (11) and a lower oil chamber (12), comprises a pressure triggering device (2), an oil pump device (3), and a drive rod (4) connected in sequence, wherein the drive rod (4) is connected to a valve; characterized in that: The pressure triggering device (2) includes a pressure chamber and a sealing cover structure (5) and a driving diaphragm (6) connected in the pressure chamber. The driving diaphragm (6) divides the pressure chamber into an upper chamber (21) and a lower chamber (22). The top side of the upper chamber (21) is provided with a pressure relief port (20) that communicates with the upper oil chamber (11). The pressure relief port (20) is disposed opposite to the sealing cover structure (5). The sealing cover structure (5) is provided with an oil guide channel (7) that communicates with the lower chamber (22) and the upper oil chamber (11). A one-way valve structure (8) that is closed at one end of the oil guide channel (7) is provided in the oil guide channel (7). When the pressure in the lower chamber (22) is greater than the pressure in the upper chamber (21), the driving diaphragm (6) drives the sealing cover structure (5) to move upward and close the pressure relief port (20). The oil pump device (3) is used to press the insulating oil in the lower oil chamber (12) into the oil guide channel (7) through the lower chamber (22) and inject it into the upper oil chamber (11) through the top-opening one-way valve structure (8). When the pressure in the upper oil chamber (11) is greater than that in the lower oil chamber (12), the drive assembly is pushed down to open the valve.

2. The valve actuator according to claim 1, characterized in that: The sealing cover structure (5) includes a bowl-shaped sealing cover (51) and a valve core seat (52) disposed on the top of the bowl-shaped sealing cover (51). The oil guide channel (7) extends along the axial direction of the valve core seat (52) and passes through the valve core seat (52) and the bowl-shaped sealing cover (51). The one-way valve structure (8) is disposed in the valve core seat (52). The valve core seat (52) extends into the pressure relief port (20). A sleeve (23) is disposed in the pressure relief port (20) and sleeved on the outside of the valve core seat (52). The bowl-shaped sealing cover (51) is linked with the driving diaphragm (6).

3. The valve actuator according to claim 2, characterized in that: The sealing cover structure (5) also includes a T-shaped limiting member (53) disposed at the bottom of the bowl-shaped sealing cover (51). The T-shaped limiting member (53) has a central through hole that connects to the oil guide channel (7). The inner periphery of the driving diaphragm (6) is sealed between the bowl-shaped sealing cover (51) and the T-shaped limiting member (53). The outer periphery of the driving diaphragm (6) is sealed to the inner wall of the pressure chamber.

4. The valve actuator according to claim 3, characterized in that: The bowl-shaped sealing cap (51) includes an annular step disposed in the oil guide channel (7), and one end of the T-shaped limiting member (53) is provided with an installation hook (531) that abuts against the annular step.

5. The valve actuator according to claim 4, characterized in that: The one-way valve structure (8) includes a first one-way valve core (81) and a first spring (82) connected in the valve core seat (52). The upper end of the valve core seat (52) is provided with a tapered opening (54). The upper end of the first one-way valve core (81) is provided with a tapered part (83) adapted to and connected to the tapered opening (54). One end of the first spring (82) is connected to the lower end of the first one-way valve core (81), and the other end is limited and abutted against the lower end of the valve core seat (52). Under the elastic force of the first spring, the first one-way valve core (81) drives the tapered part (83) to seal and close the tapered opening (54).

6. The valve actuator according to any one of claims 2-5, characterized in that: The pressure triggering device (2) includes a sealing seat (24) connected to the oil pump device (3) to form the pressure chamber, and a sealing cover (25) sleeved on the outside of the sealing seat (24). The pressure relief port (20) is formed on the top of the sealing seat (24). A sealing gasket (241) is embedded around the pressure relief port (20) on the sealing seat (24). The top of the bowl-shaped sealing cover (51) is provided with an annular protrusion (55) that is in close contact with the sealing gasket (241). A sealing ring (242) is provided between the sealing seat (24) and the oil pump device (3).

7. The valve actuator according to claim 6, characterized in that: An oil draining structure is provided between the sealing cover (25), the sealing seat (24), and the upper chamber (21). The oil draining structure includes: a plurality of oil drain holes (26) that are disposed through the side wall of the sealing seat (24) and connected to the upper chamber (21), and an oil draining gap (27) disposed between the sealing cover (25) and the sealing seat (24). The oil draining gap (27) connects the oil drain holes (26) and the lower oil chamber (12).

8. The valve actuator according to claim 7, characterized in that: An oil seal (9) is provided between the sealing cover (25) and the housing (1) to divide the internal space of the housing (1) into an upper oil chamber (11) and a lower oil chamber (12).

9. The valve actuator according to claim 8, characterized in that: The lower chamber (22) is provided with a filter screen (28) located below the driving diaphragm (6), and a limiting ring (29) for limiting the filter screen (28) is installed in the lower chamber (22).

10. The valve actuator according to any one of claims 1-9, characterized in that: The oil pump device (3) includes: The coil assembly (31) has a central cavity formed therein; The iron core assembly includes two stationary iron cores (32) disposed at both ends of the central cavity, and a plunger body (33) reciprocally disposed between the two stationary iron cores (32), wherein two plunger springs are respectively provided between the plunger body (33) and the two stationary iron cores (32); The oil pipe assembly (35) extends axially along the central cavity and passes between the two stationary iron cores (32) and the plunger body (33). When the oil pump device (3) is working, it draws the insulating oil from the lower oil chamber (12) into the upper chamber (21) through the oil pipe assembly (35).

11. The valve actuator according to claim 10, characterized in that: The oil pipe assembly (35) includes an upper oil pipe (351) and a lower oil pipe (352) fixedly inserted into the plunger body (33) along the axial direction. The upper oil pipe (351) extends out of one end of the plunger body (33) and slides through one of its stationary iron cores (32). The lower oil pipe (352) extends out of the other end of the plunger body (33) and slides through the other stationary iron core (32). A second one-way valve core (36) and a second spring (37) are provided between the upper oil pipe (351) and the lower oil pipe (352). The second spring (37) drives the second one-way valve core (36) to match and press against the port of the lower oil pipe (352). The upper oil pipe (351) is used to connect the upper chamber (21).

12. The valve actuator according to claim 11, characterized in that: The drive rod (4) is connected to the stationary iron core (32) located at the lower end of the coil assembly (31). The drive rod (4) is provided with an oil inlet hole (41) that connects to the lower oil chamber (12). The drive rod (4) and the lower oil pipe (352) are inserted into the stationary iron core (32) respectively, and a connecting cavity connecting the lower oil pipe (352) and the oil inlet hole (41) is formed in the stationary iron core (32). A third one-way valve core (38) and a third spring (39) are connected in the connecting cavity. The third spring (39) drives the third one-way valve core (38) to match and press against the port of the oil inlet hole (41).

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