Piston type quick discharge valve based on fluid self-adaptive driving

Abstract

The invention discloses a fluid-based self-adaptive driving piston type quick discharge valve, which comprises a valve body, a valve core, a valve core, a valve core, a valve core and a valve core, wherein the valve body is provided with a first through hole and a discharge port; the end cover is arranged at one end of the first through hole in a sealed mode, a second through hole communicating with the first through hole is formed in the end cover, and the second through hole is externally connected with an actuator; the piston assembly is arranged in the first through hole in a sliding mode, a circulation channel communicating with the first through hole is formed in the piston assembly, an elastic plugging piece is arranged on the inlet side of the circulation channel, and a pressure equalizing hole communicating the circulation channel with the outside of the piston assembly is further formed in the piston assembly; wherein the discharging opening is formed in the side close to the end cover, the piston assembly abuts against the end cover in a sealed mode, the circulation channel is communicated with the second through hole, and the second through hole is disconnected from the discharging opening. The piston assembly is separated from the end cover, and the second through hole communicates with the discharging opening. The quick discharge valve is easy and convenient to assemble and maintain and extremely good in sealing performance, the force of fluid can be applied to the actuator without providing an additional driving air source, and then the emergency shutoff function of opening and closing of the actuator and reverse pressure relief is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of fluid control valves, and in particular to a fluid adaptively driven piston-type quick exhaust valve. Background Art

[0002] At present, industries such as oil, natural gas, hydrogen stations and chemicals are constantly innovating and making breakthroughs. These achievements can be attributed to the highly developed and prosperous fluid control technology. Various valves and actuators are used in fluid control, but actuators often require a lot of force to start working. Quick exhaust valves can use the force of the fluid to drive the actuator to open and close, and can quickly release pressure in the reverse direction to achieve the function of emergency shutdown.

[0003] Most of the existing quick exhaust valves need to provide a separate driving air source for the piston structure, which not only increases the cost, but also increases the complexity of the fluid control system, causing inconvenience in system operation.

[0004] Therefore, in view of the above technical problems, how to provide a quick exhaust valve that is easy to assemble and maintain, has good sealing performance, and does not require an additional driving air source is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the present application is to provide a fluid-adaptive driven piston quick exhaust valve, which is easy to assemble and maintain, has excellent sealing performance, and can exert the force of the fluid on the actuator without providing an additional driving air source, thereby realizing the emergency shutdown function of the actuator's opening and closing and reverse pressure relief.

[0006] To achieve the above objectives, the present application provides a fluid-adaptive driven piston-type quick exhaust valve, comprising:

[0007] A valve body, comprising a first through hole and a discharge port connecting the first through hole and the outside of the valve body;

[0008] An end cover is sealed at a first end of the first through hole, the end cover is provided with a second through hole communicating with the first through hole, and the second through hole is externally connected to an actuator;

[0009] A piston assembly is slidably disposed in the first through hole, the piston assembly is provided with a circulation channel connected to the first through hole, an elastic plugging member is provided on the inlet side of the circulation channel, fluid pressure acts on the elastic plugging member to open the circulation channel, and the elastic plugging member is reset after the fluid pressure weakens or disappears, and the piston assembly is also provided with a pressure equalizing hole connecting the circulation channel and the outside of the piston assembly;

[0010] A sealing assembly, comprising a first sealing ring disposed on the outer periphery of the piston assembly and slidingly sealing with the inner wall of the first through hole;

[0011] Wherein, the discharge port is arranged on a side close to the end cover, and during the sliding process of the piston assembly relative to the valve body, there are at least two position states. In the first position state, the piston assembly is sealed and abutted against the end cover, the flow channel is connected with the second through hole, and the second through hole is cut off from the discharge port; in the second position state, the piston assembly is separated from the end cover, and the second through hole is connected with the discharge port.

[0012] Preferably, the piston assembly comprises:

[0013] A piston body, wherein one end of the piston body is provided with a piston inlet connected with the first through hole, a hollow cavity is provided inside the piston body, the elastic sealing member is provided in the hollow cavity, and the pressure equalizing hole corresponds to the position of the hollow cavity;

[0014] The piston end cover is sealed at the other end of the piston body and corresponds to the end cover. The piston end cover is provided with a piston outlet. The piston inlet, the hollow cavity and the piston outlet are connected to form the circulation channel. The outer surface of the piston end cover facing the end cover is provided with an outer conical surface. The end cover includes a connecting section extending into the first through hole, and the connecting section is provided with an inner conical surface that cooperates with the outer conical surface metal seal.

[0015] Preferably, the elastic blocking member comprises:

[0016] A plugging head is arranged in the hollow cavity near the piston inlet, and the outer surface of the plugging head is in circumferential sealing contact with the piston inlet;

[0017] A sealing gasket is sleeved on the outer circumference of the plugging head, the side surface of the sealing gasket is in sealing contact with the wall surface of the outer circumferential edge of the piston inlet, the outer ring of the sealing gasket is provided with a first notch, and a through hole leading to the outer surface of the plugging head is provided on the sealing gasket at the first notch;

[0018] The plugging seat comprises a first column body that is slidably matched with the inner wall of the hollow cavity and a second column body that is coaxially connected to the first column body, a second notch that is matched with the outer surface of the plugging head is provided in the middle of the first column body, and the plugging head is partially embedded in the second notch, an arc-shaped protrusion extending toward the sealing gasket is provided on the outer ring of the first column body, and the sealing gasket is embedded in the circular notch formed by the arc-shaped protrusion, and a third notch is also provided on the outer ring of the first column body to keep the hollow cavities on both sides of the first column body connected;

[0019] An elastic member has one end sleeved on the outer periphery of the second cylinder and fixedly connected to the first cylinder, and the other end fixedly arranged on the piston end cover. The elastic member is initially in a compressed state so that the plugging head is tightly pressed against the piston inlet.

[0020] Preferably, the outer surface of the piston end cover and the inner surface of the piston body are provided with matching threads, and the sealing assembly also includes a second sealing ring arranged on the outer periphery of the piston end cover, the second sealing ring is adjacent to the threads on the outer surface of the piston end cover, and cooperates with the inner surface of the piston body to seal.

[0021] Preferably, a plastic plug is sleeved on the cylindrical surface of the piston end cover close to the outer cone surface, and the end of the plastic plug facing the end cover serves as a continuation of the outer cone surface, and the continuation cone surface cooperates with the inner cone surface on the end cover to form a soft sealing connection.

[0022] Preferably, a hexagonal notch is provided at the outlet end of the piston outlet, and a straight groove flow opening passing through the hexagonal notch is provided on the outer end surface of the piston end cover, the two ends of the straight groove flow opening start and end at the outer conical surface, and the middle part intersects with the hexagonal notch.

[0023] Preferably, a guide belt is further provided on the outer periphery of the piston body, and the guide belt is in contact with the inner wall of the first through hole to avoid metal friction between the outer periphery of the piston body and the inner wall of the first through hole.

[0024] Preferably, the inner wall of the first through hole is provided with a retaining ring extending toward the axis thereof, the piston assembly is arranged in the first through hole between the retaining ring and the end cover, the retaining ring and the end cover respectively limit the sliding position of the piston assembly, and a fluid pipeline is connected to the first through hole on the side of the retaining ring away from the piston assembly.

[0025] Preferably, the inner ring of the retaining ring is provided with a stepped shaft through hole, which includes a large diameter hole close to the piston assembly and a small diameter hole away from the piston assembly, and the diameter of the inlet side of the circulation channel on the piston assembly is smaller than the diameter of the small diameter hole.

[0026] Preferably, the first through hole is a through hole opened along the axial direction of the valve body, the outlet is a through hole opened along the radial direction of the valve body, and an eccentric hole close to the end cover is opened at the connection between the outlet and the first through hole.

[0027] Compared with the above background technology, the present application injects fluid into the first through hole, and the fluid pressure acts on the piston assembly and pushes the piston assembly to move toward the end cover until the piston assembly abuts against the end cover. At this time, the piston assembly and the end cover are sealed and abutted, so that the discharge port and the second through hole are closed, and as the fluid pressure continues to act on the elastic sealing member through the circulation channel, the elastic sealing member gradually opens the circulation channel, so that the circulation channel and the second through hole remain connected, the fluid enters the actuator, exerts a large fluid force, and the actuator starts to work; the fluid in the first through hole is shut off, the elastic sealing member is reset to shut off the circulation channel, the force of the actuator's reverse pressure relief acts on the piston assembly, and pushes the piston assembly away from the end cover, and during the process of moving away, the second through hole can be connected to the discharge port, so that the fluid is quickly discharged from the valve body, and the actuator is shut off without the action of fluid force and stops working. The quick exhaust valve of the present application realizes the emergency shut-off function of controlling the opening and closing of the actuator and reverse pressure relief, without a driving air source and complex system pipelines, with low cost and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0029] FIG1 is a schematic structural diagram of a fluid-adaptively driven piston-type quick exhaust valve when starting an actuator according to an embodiment of the present application;

[0030] FIG2 is a schematic diagram of the structure of a piston assembly provided in an embodiment of the present application;

[0031] FIG3 is a schematic diagram of the structure of a reverse pressure relief emergency based on a fluid adaptively driven piston-type quick exhaust valve provided in an embodiment of the present application;

[0032] FIG4 is a schematic diagram of the structure of a sealing gasket provided in an embodiment of the present application;

[0033] FIG5 is a schematic diagram of the structure of the blocking seat provided in an embodiment of the present application;

[0034] FIG6 is a schematic diagram of the structure of a piston end cover provided in an embodiment of the present application;

[0035] FIG7 is a schematic diagram of the structure of a plastic plug provided in an embodiment of the present application;

[0036] FIG8 is a schematic diagram of the external structure of a fluid adaptively driven piston-type quick exhaust valve provided in an embodiment of the present application;

[0037] FIG. 9 is a schematic diagram of the structure of the hexagonal notch and the straight groove flow channel opening provided in an embodiment of the present application.

[0038] In the figure: 1-piston assembly;

[0039] 11-elastic plugging member; 111-plugging head; 112-sealing gasket; 1121-first notch; 1122-through hole; 113-plugging seat; 1131-first column; 1132-second column; 1133-second notch; 1134-arc-shaped protrusion; 1135-third notch; 114-elastic member;

[0040] 12-piston body; 121-piston inlet; 122-pressure equalizing hole; 123-hollow cavity;

[0041] 13-piston end cover; 131-piston outlet; 132-external cone; 133-hexagonal notch; 134-slotted flow channel outlet;

[0042] 14- guide belt;

[0043] 15- plastic plug; 151- conical surface extension;

[0044] 2-valve body;

[0045] 21- a first through hole;

[0046] 22-discharge port; 221-eccentric hole;

[0047] 23- retaining ring; 231- stepped shaft through hole;

[0048] 3- Sealing assembly;

[0049] 31-first sealing ring;

[0050] 32- second sealing ring;

[0051] 4-end cap;

[0052] 41- Second through hole. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] As shown in Figure 1, in this embodiment, a fluid adaptively driven piston quick exhaust valve is provided, including a valve body 2, an end cover 4, a piston assembly 1 and a sealing assembly 3. The valve body 2 is provided with a first through hole 21, and the first through hole 21 can be arranged axially along the valve body 2. At the same time, the valve body 2 is also provided with an exhaust port 22 that is connected to the first through hole 21 and connected to the outside of the valve body 2, and the exhaust port 22 can be arranged radially along the valve body 2.

[0057] One end of the first through hole 21 is connected to the fluid pipeline, and an end cap 4 is sealed at the other end of the first through hole 21. The end cap 4 is provided with a second through hole 41 communicating with the first through hole 21. The second through hole 41 is externally connected to the actuator, and the fluid can enter the actuator through the second through hole 41, or receive the fluid of the actuator through the second through hole 41. The end cap 4 can be installed on the valve body 2 through the screw installation through hole and the screw, please refer to Figure 8 for details, and a third sealing ring is added between the end cap 4 and the valve body 2 to ensure the sealing of the connection between the end cap 4 and the valve body 2.

[0058] The piston assembly 1 is slidably disposed in the first through hole 21. A flow channel connected to the first through hole 21 is disposed on the piston assembly 1, and an elastic plugging member 11 is disposed on the inlet side of the flow channel. When fluid is introduced into the first through hole 21 and the fluid pressure acts on the elastic plugging member 11, the elastic plugging member 11 can be forced to open the flow channel under certain conditions, so that the fluid enters the second through hole 41 through the flow channel, and finally the actuator is started. When the actuator reversely releases pressure, the fluid is stopped from being injected into the first through hole 21, and the fluid pressure on the elastic plugging member 11 gradually weakens or disappears. The elastic plugging member 11 is reset under the action of its own elastic force, and the flow channel is closed. The force of the actuator's reverse pressure relief acts on the piston assembly 1, pushing the piston assembly 1 away from the end cover 4, and during the process of moving away, the second through hole 41 can be connected to the discharge port 22, so that the fluid is quickly discharged from the valve body 2, and the actuator is shut down without the action of the fluid force and stops working.

[0059] It should be pointed out that in the process of the piston assembly 1 approaching or moving away from the end cover 4, due to the pressure difference between its inside and outside, the sliding is not smooth and there is a reset delay. Therefore, the present application provides a pressure equalizing hole 122 on the piston assembly 1 that connects the flow channel and the outside of the piston assembly 1, thereby ensuring that the internal fluid of the piston assembly 1 can be depressurized through the pressure equalizing hole 122 to ensure the pressure balance inside and outside the piston assembly 1, thereby ensuring that the piston assembly 1 can slide smoothly.

[0060] In addition, the sealing assembly 3 includes a first sealing ring 31 which is arranged on the outer periphery of the piston assembly 1 and is slidably sealed with the inner wall of the first through hole 21, thereby ensuring that the fluid in the first through hole 21 can only flow to the second through hole 41 through the circulation channel in the piston assembly 1. It should be noted that during the sliding process of the piston assembly 1, the first sealing ring 31 should always remain on the side of the discharge port 22 and remain sealed with the inner wall of the first through hole 21, thereby ensuring the sealing effect between the piston assembly 1 and the first through hole 21.

[0061] In some embodiments, the outlet 22 is provided on the valve body 2 near the end cover 4. For details, please refer to FIG. 1 or FIG. 3. During the sliding process of the piston assembly 1 relative to the valve body 2, there are at least two positions. In the first position, the piston assembly 1 is in sealing contact with the end cover 4. At this time, the flow channel is correspondingly and sealedly connected with the second through hole 41, and the corresponding second through hole 41 is disconnected from the outlet 22. In the second position, the piston assembly 1 is separated from the end cover 4, and the second through hole 41 is connected with the outlet 22, so that the fluid can be depressurized through the outlet 22.

[0062] Specifically, the first position state is a state in which the actuator is turned on, please refer to Figure 1. Before reaching the first position state, due to the presence of the elastic sealing member 11, the fluid pressure in the first through hole 21 first acts on the piston assembly 1 as a whole, and pushes the piston assembly 1 to move toward the end cover 4 until it moves to a sealed abutment with the end cover 4. After the piston assembly 1 cannot move, the pressure of the fluid will continue to act on the elastic sealing member 11 until the elastic sealing member 11 opens the flow channel, and the fluid can enter the actuator through the flow channel and the second through hole 41 to start the actuator; the second position state is a state in which the actuator is reversely depressurized, please refer to Figure 3. After the fluid is stopped from being injected into the first through hole 21, the fluid pressure on the elastic sealing member 11 is reduced, thereby closing the flow channel under certain conditions, and the fluid pressure of the reverse depressurization of the actuator will push the piston assembly 1 away from the end cover 4, thereby causing the fluid to be depressurized through the exhaust port 22.

[0063] Please refer to Figure 2, the piston assembly 1 also includes a piston body 12 and a piston end cover 13. The piston body 12 serves as the external shell part of the piston assembly 1. A piston inlet 121 connected to the first through hole 21 is opened at one end of the piston body 12. A hollow cavity 123 is provided inside the piston body 12. The elastic sealing member 11 is arranged in the hollow cavity 123. The pressure equalizing hole 122 corresponds to the position of the hollow cavity 123, so that the fluid in the hollow cavity 123 can be discharged to balance the internal and external pressures of the piston assembly 1.

[0064] The piston end cover 13 is sealed at the other end of the piston body 12 and corresponds to the position of the end cover 4, so that the piston end cover 13 can be sealed against the end cover 4. The piston end cover 13 is provided with a piston outlet 131, and the piston inlet 121, the hollow cavity 123 and the piston outlet 131 are connected to form a circulation channel.

[0065] In order to ensure the sealing abutment effect between the piston end cover 13 and the end cover 4, an outer conical surface 132 is provided on the outer surface of the piston end cover 13 facing the end cover 4, please refer to Figure 6 for details, and the end cover 4 includes a connecting section extending into the first through hole 21, and an inner conical surface is provided on the connecting section to cooperate with the outer conical surface 132 in a metal seal, so that the outer conical surface 132 cooperates with the inner conical surface to form the first metal seal between the piston end cover 13 and the end cover 4. In addition, a third sealing ring can be provided on the outer periphery of the connecting section, and the third sealing ring is interference-fitted with the inner wall of the first through hole 21, so as to ensure that the fluid is discharged into or out of the actuator only through the second through hole 41.

[0066] The outer surface of the piston end cover 13 facing the piston body 12 is processed with threads, and the corresponding end of the inner surface of the piston body 12 is also processed with threads, and the two threads are fastened together. In addition, the sealing assembly 3 also includes a second sealing ring 32 arranged on the outer periphery of the piston end cover 13, that is, an O-ring groove is opened on the piston end cover 13 close to or adjacent to the thread for installing the second sealing ring 32, and the second sealing ring 32 is sealed with the inner surface of the piston body 12 by interference fit. The second sealing ring 32 is used to seal the hollow cavity 123 of the piston body 12 and the outer surface of the piston end cover 13, so that the fluid can only flow out of the piston assembly 1 from the piston outlet 131 in the middle of the piston end cover 13.

[0067] The elastic sealing member 11 includes a sealing head 111, a sealing gasket 112, a sealing seat 113 and an elastic member 114. Please refer to Figure 1. The sealing head 111 is arranged in the hollow cavity 123 on the side close to the piston inlet 121, and the outer surface of the sealing head 111 is in circumferential sealing contact with the piston inlet 121; the sealing contact here is when the elastic sealing member 11 is in the initial state, and the sealing head 111 can be a zirconia ceramic ball, and the spherical outer surface of the ceramic ball is in contact with the outer edge of the piston inlet 121.

[0068] The sealing gasket 112 is sleeved on the outer periphery of the plugging head 111. A spherical notch is provided in the middle of the sealing gasket 112 to cooperate with the zirconia ceramic ball. The side of the sealing gasket 112 is sealed against the wall of the outer peripheral edge of the piston inlet 121. At the same time, a plurality of first notches 1121 are provided on the outer ring of the sealing gasket 112. Please refer to FIG4. A through hole 1122 leading to the outer surface of the plugging head 111 is provided on the sealing gasket 112 at the first notch 1121. When fluid is introduced into the first through hole 21 and the piston assembly 1 is pushed to abut against the end cover 4, the initial fluid pressure is relatively small. However, as the fluid pressure gradually increases, the pressure acting on the plugging head 111 will also gradually increase, resulting in an increase in the movement amplitude of the plugging head 111. However, the sealing gasket 112 is not directly subjected to the fluid pressure, and its movement amplitude is relatively small, resulting in the separation of the plugging head 111 and the sealing gasket 112. At this time, the opening of the piston inlet 121 is small, and the fluid can only flow from the spherical surface in the middle of the sealing gasket 112. The fluid flows from the slot to the radial through hole 1122, and after reaching the first slot 1121 on the edge, it flows to the piston outlet 131 through the hollow cavity 123; when the fluid force reaches a certain level, the sealing gasket 112 moves together with the plugging head 111 without separation, but the sealing gasket 112 is separated from the wall surface of the circumferential outer edge of the piston inlet 121, causing the opening of the piston inlet 121 to become larger, and the fluid flows directly from the first slot 1121 on the edge of the sealing gasket 112 to the piston outlet 131.

[0069] In some embodiments, a conical surface that matches the plugging head 111 is provided on the side of the piston inlet 121 facing the plugging head 111, so that the outer surface of the zirconia ceramic ball can match the conical surface to form a first metal seal between the elastic plugging member 11 and the piston inlet 121. The sealing gasket 112 forms a second soft seal with the wall surface of the circumferential outer edge of the piston inlet 121, thereby ensuring the sealing effect of the elastic plugging member 11.

[0070] The sealing seat 113 includes a first column 1131 that slides with the inner wall of the hollow cavity 123 and a second column 1132 that is coaxially connected to the first column 1131. Please refer to Figure 5. A second slot 1133 that cooperates with the outer surface of the sealing head 111 is opened in the middle of the first column 1131. The sealing head 111 is partially embedded in the second slot 1133. The second slot 1133 can be a conical slot for supporting the zirconia ceramic ball and limiting its radial movement; the outer ring of the first column 1131 is provided with an arc-shaped protrusion 1134 extending toward the sealing gasket 112, and the sealing gasket 112 is embedded in the circular slot formed by the arc-shaped protrusion 1134 to support and fix the sealing gasket 112. In addition, a plurality of third slots 1135 are provided on the outer ring of the first column 1131 so that when the first column 1131 cooperates with the hollow cavity 123 of the piston body 12, the hollow cavities 123 on both sides of the first column 1131 can remain connected, thereby allowing the fluid to flow from the third slots 1135 to the piston slot.

[0071] The elastic member 114 can be a component with elastic deformation such as a spring. In this embodiment, a spring is taken as an example. One end of the elastic member 114 is sleeved on the outer periphery of the second cylinder 1132 and fixedly connected to the first cylinder 1131, and the other end is fixedly arranged on the piston end cover 13. The elastic member 114 is initially in a compressed state, so that the plugging head 111 can be pressed against the piston inlet 121 in the initial state. That is, the second cylinder 1132 is to extend into the inner diameter of the spring to limit one end of the spring to prevent it from moving radially; and an axial hole adapted to the elastic member 114 can also be opened on the piston end cover 13, please refer to Figure 6, to install and support the elastic member 114, and limit the elastic member 114. It should be pointed out that the above-mentioned axial hole is different from the piston outlet 131. The two can be kept connected and coaxially arranged, but the diameters of the two are different, and the diameter of the axial hole should be larger than the diameter of the piston outlet 131.

[0072] At this point, the piston body 12 and the piston end cover 13 cooperate to seal the elastic sealing member 11 in the hollow cavity 123 of the piston body 12, and the piston assembly 1 is arranged in an integral manner.

[0073] In addition, a plastic plug 15 is sleeved on the cylindrical surface of the piston end cover 13 close to the outer conical surface 132. Please refer to Figures 2 and 7 for details. A limiting step is provided on the piston end cover 13, and the plastic plug 15 abuts against the limiting step to prevent axial movement; the end of the plastic plug 15 facing the end cover 4 serves as a continuation conical surface 151 of the outer conical surface 132, and the continuation conical surface 151 cooperates with the inner conical surface of the end cover 4 to form a soft sealing connection.

[0074] Further, please refer to FIG. 9 , the outlet end of the piston outlet 131 is provided with a hexagonal notch 133, which can be used as a wrench position so that the piston end cover 13 can be tightened on the piston body 12 by a hexagonal wrench, and a slotted flow opening 134 passing through the hexagonal notch 133 is provided on the outer end surface of the piston end cover 13, and the two ends of the slotted flow opening 134 start and end at the outer cone 132, and the middle part intersects with the hexagonal notch 133; the purpose of the slotted flow opening 134 is to eliminate the influence of the axial hexagonal notch 133 edges, the chamfer of the end face of the hexagonal notch 133, and the flat mouth on the fluid flow channel, so that the fluid can flow out smoothly from the piston outlet 131 of the piston end cover 13. In addition, the slotted six-way opening can also prevent the piston assembly 1 from being firmly in contact with the end cover 4, and when the fluid is reversely depressurized from the actuator, it is prevented that the piston assembly 1 is separated from the piston end cover 13 slowly, thereby affecting the rapid closing of the actuator.

[0075] In addition, at least two annular notches are provided on the outer circumference of the piston body 12, and the two annular notches are used to install the guide belts 14, and the first sealing ring 31 is installed in one of the annular notches. The function of the guide belt 14 is to separate the piston body 12 from the valve body 2 to prevent metal friction when the piston body 12 moves axially in the valve body 2, which may cause internal wear of the piston body 12 or the valve body 2.

[0076] Please refer to Figure 1. A retaining ring 23 extending toward the axis of the first through hole 21 is provided on the inner wall of the first through hole 21. The piston assembly 1 is arranged in the first through hole 21 between the retaining ring 23 and the end cover 4. The retaining ring 23 and the end cover 4 respectively limit the left and right sliding positions of the piston assembly 1. A fluid pipeline is connected to the first through hole 21 on the side of the retaining ring 23 away from the piston assembly 1.

[0077] A stepped shaft through hole 231 is provided on the inner ring of the retaining ring 23. The purpose of the stepped shaft through hole 231 is to separate the fluid pipeline from the piston assembly 1 and to control the fluid flow rate. Specifically, the stepped shaft through hole 231 includes a large-diameter hole on the side close to the piston assembly 1 and a small-diameter hole on the side away from the piston assembly 1. The inlet side diameter of the flow channel is smaller than the diameter of the small-diameter hole. The purpose of the large-diameter hole is to allow the fluid to gather here and increase the contact area between the fluid and the piston body 12, so that the piston body 12 is subjected to a large area of ​​fluid action, which makes it easier to push the piston assembly 1 to abut against the end cover 4.

[0078] In some embodiments, an eccentric hole 221 is provided at the connection between the discharge port 22 and the first through hole 21, which is close to the end cover 4. The purpose of the eccentric hole 221 is to make the flow channel of the valve body 2 long enough, that is, to ensure that the flow channel of the first through hole 21 is long enough. Whether the piston assembly 1 is fitted or separated from the end cover 4, the flow channel of the valve body 2 can form a seal with the first sealing ring 31 on the piston assembly 1. When the piston assembly 1 is fitted with the end cover 4, the fluid is prevented from flowing from the piston inlet 121 into the discharge port 22, affecting the rapid opening of the actuator; when the piston assembly 1 is separated from the end cover 4, the fluid is prevented from flowing from the second through hole 41 into the first through hole 21 on the side of the piston assembly 1 away from the end cover 4, affecting the rapid reverse pressure relief closing function of the actuator. Therefore, the ingenious setting of the eccentric hole 221 structure plays a vital role in achieving the reverse pressure relief and rapid closing of the fluid from the actuator.

[0079] When the actuator starts working:

[0080] The initial state of the piston assembly 1 is shown in FIG3 . The piston assembly 1 is close to the leftmost end of the first through hole 21 of the valve body 2, that is, the piston assembly 1 is in contact with the retaining ring 23. The piston assembly 1 separates the first through hole 21 into two cavities. The fluid generated in the cavity will balance the pressure on the left and right sides through the pressure equalizing hole 122. When the fluid enters the valve body 2 from the first through hole 21 and gathers more in the large diameter hole of the retaining ring 23, the fluid force applied to the left end face of the piston assembly 1 increases, pushing the piston assembly 1 to the right until the outer conical surface 132 at the right end of the piston assembly 1 is matched and connected with the inner conical surface at the left end of the end cover 4 and stops moving, as shown in FIG1 . At this time, the piston assembly 1 is connected to the second through hole 41, the discharge port 22 is shielded and not conductive, the plugging head 111 will be pushed open and move to the right, the piston inlet 121 is opened, and the fluid flows from the piston inlet 121 to the piston outlet 131, then flows to the second through hole 41 and finally reaches the actuator. The fluid applies a large pilot pressure to the actuator, and the actuator starts to work.

[0081] When the actuator is reversed and the pressure is released for emergency shutdown:

[0082] After the fluid in the first through hole 21 is shut off, no fluid flows into the piston inlet 121, and the left end face of the piston assembly 1 will not be affected by the fluid pressure. The elastic force exerted by the elastic member 114 on the sealing seat 113 causes the sealing head 111 and the sealing gasket 112 to seal the piston inlet 121. At this time, the retaining ring 23 and the left end face of the piston assembly 1 form a cavity, and the fluid generated in the cavity will be discharged to the first through hole 21 at the right end of the piston through the pressure equalizing hole 122, so that the pressure on the left and right ends of the cavity volume formed by the valve body 2 and the piston assembly 1 is balanced; and the compression spring in the actuator discharges the fluid in the opposite direction to relieve the pressure, and the right end face of the piston assembly 1 is acted upon by the fluid force, pushing the piston assembly 1 to move left to the retaining ring 23, as shown in Figure 3. At this time, the second through hole 41 is connected to the discharge port 22, and the fluid is quickly discharged from the valve, the actuator is shut down without the action of fluid force, and the actuator stops working.

[0083] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0084] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A fluid-adaptive driven piston-type quick exhaust valve, characterized in that: include: A valve body (2) comprising a first through hole (21) and an outlet (22) for communicating the first through hole (21) with the outside of the valve body (2); an end cover (4) sealed at a first end of the first through hole (21), the end cover (4) being provided with a second through hole (41) in communication with the first through hole (21), the second through hole (41) being externally connected to an actuator; A piston assembly (1) is slidably disposed in the first through hole (21); a flow channel connected to the first through hole (21) is provided on the piston assembly (1); an elastic plugging member (11) is provided on the inlet side of the flow channel; fluid pressure acts on the elastic plugging member (11) to open the flow channel; and after the fluid pressure weakens or disappears, the elastic plugging member (11) is reset; and a pressure equalizing hole (122) is also provided on the piston assembly (1) to connect the flow channel and the outside of the piston assembly (1); The sealing assembly (3) comprises a first sealing ring (31) which is arranged on the outer periphery of the piston assembly (1) and is slidably sealed with the inner wall of the first through hole (21); The discharge port (22) is arranged on a side close to the end cover (4), and during the sliding process of the piston assembly (1) relative to the valve body (2), there are at least two position states. In the first position state, the piston assembly (1) is in sealing contact with the end cover (4), the flow channel is connected to the second through hole (41), and the second through hole (41) is disconnected from the discharge port (22); in the second position state, the piston assembly (1) is separated from the end cover (4), and the second through hole (41) is connected to the discharge port (22).

2. The fluid adaptive driven piston type quick exhaust valve according to claim 1, characterized in that: The piston assembly (1) comprises: A piston body (12), wherein one end of the piston body (12) is provided with a piston inlet (121) connected to the first through hole (21), a hollow cavity (123) is provided inside the piston body (12), the elastic sealing member (11) is arranged in the hollow cavity (123), and the pressure equalizing hole (122) corresponds to the position of the hollow cavity (123); A piston end cover (13) is sealingly arranged at the other end of the piston body (12) and corresponds to the end cover (4); a piston outlet (131) is provided on the piston end cover (13); the piston inlet (121), the hollow cavity (123) and the piston outlet (131) are connected to form the circulation channel; an outer surface of the piston end cover (13) facing the end cover (4) is provided with an outer conical surface (132); the end cover (4) includes a connecting section extending into the first through hole (21); the connecting section is provided with an inner conical surface which cooperates with the outer conical surface (132) in a metal seal.

3. The fluid adaptive driven piston type quick exhaust valve according to claim 2 is characterized in that: The elastic blocking member (11) comprises: A plugging head (111) is arranged in the hollow cavity (123) on a side close to the piston inlet (121), and an outer surface of the plugging head (111) is in circumferential sealing contact with the piston inlet (121); A sealing gasket (112) is sleeved on the outer circumference of the plugging head (111), the side surface of the sealing gasket (112) is in sealing contact with the wall surface of the circumferential outer edge of the piston inlet (121), the outer ring of the sealing gasket (112) is provided with a first notch (1121), and a through hole (1122) leading to the outer surface of the plugging head (111) is provided on the sealing gasket (112) at the first notch (1121); The sealing seat (113) comprises a first column (1131) which is slidably matched with the inner wall of the hollow cavity (123) and a second column (1132) which is coaxially connected to the first column (1131); a second notch (1133) which is matched with the outer surface of the sealing head (111) is provided in the middle of the first column (1131); the sealing head (111) is partially embedded in the second notch (1133); an arc-shaped protrusion (1134) extending toward the sealing gasket (112) is provided on the outer ring of the first column (1131); the sealing gasket (112) is embedded in the circular notch formed by the arc-shaped protrusion (1134); and a third notch (1135) is further provided on the outer ring of the first column (1131) so that the hollow cavities (123) on both sides of the first column (1131) remain connected; An elastic member (114) has one end sleeved on the outer circumference of the second column (1132) and fixedly connected to the first column (1131), and the other end fixedly disposed on the piston end cover (13). The elastic member (114) is initially in a compressed state so that the sealing head (111) is pressed tightly against the piston inlet (121).

4. The fluid adaptive driven piston type quick exhaust valve according to claim 2, characterized in that: The outer surface of the piston end cover (13) and the inner surface of the piston body (12) are provided with mutually matching threads, and the sealing assembly (3) also includes a second sealing ring (32) provided on the outer periphery of the piston end cover (13), the second sealing ring (32) is adjacent to the threads on the outer surface of the piston end cover (13), and cooperates with the inner surface of the piston body (12) to seal.

5. The fluid adaptive driven piston type quick exhaust valve according to claim 2, characterized in that: A plastic plug (15) is sleeved on the cylindrical surface of the piston end cover (13) close to the outer conical surface (132); one end of the plastic plug (15) facing the end cover (4) serves as a continuation conical surface (151) of the outer conical surface (132); the continuation conical surface (151) cooperates with the inner conical surface on the end cover (4) to form a soft sealing connection.

6. The fluid adaptive driven piston type quick exhaust valve according to claim 2, characterized in that: The outlet end of the piston outlet (131) is provided with a hexagonal notch (133), and the outer end surface of the piston end cover (13) is provided with a straight groove flow opening (134) passing through the hexagonal notch (133), the two ends of the straight groove flow opening (134) start and end at the outer conical surface (132), and the middle part intersects with the hexagonal notch (133).

7. The fluid adaptive driven piston type quick exhaust valve according to claim 2, characterized in that: A guide band (14) is also provided on the outer periphery of the piston body (12), and the guide band (14) is in contact with the inner wall of the first through hole (21) to avoid metal friction between the outer periphery of the piston body (12) and the inner wall of the first through hole (21).

8. The fluid adaptively driven piston type quick exhaust valve according to any one of claims 1 to 7, characterized in that: The inner wall of the first through hole (21) is provided with a retaining ring (23) extending toward the axis thereof; the piston assembly (1) is arranged in the first through hole (21) between the retaining ring (23) and the end cover (4); the retaining ring (23) and the end cover (4) respectively limit the sliding position of the piston assembly (1); and a fluid pipeline is connected to the first through hole (21) on the side of the retaining ring (23) facing away from the piston assembly (1).

9. The fluid adaptive driven piston type quick exhaust valve according to claim 8, characterized in that: The inner ring of the retaining ring (23) is provided with a stepped shaft through hole (231), the stepped shaft through hole (231) comprising a large-diameter hole on a side close to the piston assembly (1) and a small-diameter hole on a side away from the piston assembly (1), and the diameter of the inlet side of the circulation channel on the piston assembly (1) is smaller than the diameter of the small-diameter hole.

10. The fluid adaptive driven piston type quick exhaust valve according to claim 1, characterized in that: The first through hole (21) is a through hole opened along the axial direction of the valve body (2), the outlet (22) is a through hole opened along the radial direction of the valve body (2), and an eccentric hole (221) close to the direction of the end cover (4) is opened at the connection between the outlet (22) and the first through hole (21).

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