Pneumatic device with needle valve pressure relief, air control drain valve and water tank

Abstract

The application discloses a kind of needle valve pressure relief pneumatic device, air control drainage valve and water tank, pneumatic device includes air inlet cover, inflatable telescopic piece, driven part, self pressure relief piece and open-close mechanism, external air pump is connected with air inlet cover, can be filled into inflatable telescopic piece in gas, when inflating, open-close mechanism can make exhaust section and the inner cavity of inflatable telescopic piece mutually isolated, during inflation process, inflatable telescopic piece can be lossless, rapidly expand and extend, and drive driven part to open external drainage valve to drain water.In after draining, inflatable telescopic piece is fully expanded and extended, open-close mechanism makes the exhaust section of self pressure relief piece pass through communication hole, so that the inner cavity of inflatable telescopic piece is vented and shrinks through the gap between the venting column of exhaust section and communication hole, so that drainage valve can gradually reset and close drainage, realize automatic pressure relief.The cross-sectional area of venting column is less than the cross-sectional area of communication hole, so that venting is more stable, smooth, reduces venting failure, improves venting efficiency.

Description

[0001] This application is a divisional application of the application filed on November 29, 2021, with application number 202111436971.7 and titled "A pneumatic device for needle valve pressure relief, a pneumatically controlled drain valve and a water tank". Technical Field

[0002] This invention relates to the field of pneumatic device technology, and in particular to a pneumatic device for needle valve pressure relief, a pneumatically controlled drain valve, and a water tank. Background Technology

[0003] Traditional toilets mostly use mechanical drain valves to drain the tank. When flushing is needed, the valve is usually opened manually by pressing a button. As people's demands for quality of life increase, contactless drain valves are gradually being used in smart toilets. Because they lack the manual mechanical drive, contactless drain valves require an additional pneumatic device to trigger their operation.

[0004] Currently, commonly used pneumatic devices on the market consist of an air pump, an air bladder, and a pressure relief valve. When drainage is needed, the air pump is activated to inflate the air bladder. The inflated air bladder expands and drives the driven rod to trigger the drain valve. However, since existing pneumatic devices do not have a pressure relief function, a dedicated pressure relief module is usually required to achieve this. This involves adding a solenoid valve and using a pneumatic circuit to vent the air bladder. However, this solution requires additional components such as solenoid valves, piping, and circuitry, resulting in higher costs, a complex structure, larger space requirements, messy internal wiring, and significant assembly and maintenance difficulties. Additionally, some existing pneumatic devices have an automatic pressure relief structure, which releases air from the air bladder. However, this suffers from a high failure rate due to air leakage. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a pneumatic device for needle valve pressure relief, which can reduce air leakage failures and improve air leakage efficiency.

[0006] The present invention also proposes a pneumatically controlled drain valve and a water tank having the above-mentioned needle valve pressure relief pneumatic device.

[0007] According to a first aspect of the present invention, a pneumatic device for relieving pressure on a needle valve includes a housing, an air inlet cover, an inflation telescopic member, a driven member, and a self-relieving member. The air inlet cover is fixed to the upper part of the housing and is in sealed communication with the inflation telescopic member. The air inlet cover is capable of inflating the inflation telescopic member, which expands and extends within the housing after inflation. The driven member is connected to the movable end of the inflation telescopic member and can reach the bottom of the housing. The bottom of the inflation telescopic member is provided with a receiving platform, and the receiving platform has a communicating hole. The pneumatic device for relieving pressure on a needle valve further includes an opening and closing mechanism. A pressure relief component is connected to the movable end of the inflatable telescopic component. The self-relieving pressure relief component can slide vertically in the connecting hole. The self-relieving pressure relief component is provided with an exhaust section, and the exhaust section is provided with an air vent column. The cross-sectional area of ​​the air vent column is smaller than the cross-sectional area of ​​the connecting hole. When the inflatable telescopic component is inflated, the opening and closing mechanism can isolate the exhaust section and the inner cavity of the inflatable telescopic component from each other. After the inflatable telescopic component is fully expanded and elongated, the opening and closing mechanism can allow the air vent column to pass upward through the connecting hole, and allow the inner cavity of the inflatable telescopic component to deflate and contract through the gap between the connecting hole and the air vent column.

[0008] The pneumatic device according to embodiments of the present invention has at least the following beneficial effects:

[0009] By incorporating an air inlet cap, an inflatable telescopic component, a driven component, a self-releasing pressure component, and an opening and closing mechanism, an external air pump connected to the air inlet cap can fill the inflatable telescopic component with gas. During inflation, the opening and closing mechanism isolates the exhaust section from the inner cavity of the inflatable telescopic component. Therefore, during inflation, the inflatable telescopic component can expand and elongate rapidly and without loss, driving the driven component to open the external drain valve for drainage. After drainage is complete, once the inflatable telescopic component has fully expanded and elongated, the opening and closing mechanism allows the exhaust section of the self-releasing pressure component to pass through the connecting hole. This allows the inner cavity of the inflatable telescopic component to vent and contract through the gap between the vent column of the exhaust section and the connecting hole, thereby enabling the drain valve to gradually reset and close the drainage, achieving automatic pressure relief. The cross-sectional area of ​​the vent column is smaller than that of the connecting hole, making venting more stable and smooth, reducing venting failures, improving venting efficiency, and lowering production costs.

[0010] According to some embodiments of the present invention, the length of the vent column is greater than the vertical thickness of the receiving platform.

[0011] According to some embodiments of the present invention, the self-relieving pressure member is further provided with a sealing section, the sealing section being located above the exhaust section, and the sidewall of the sealing section being sealed by being tightly attached to the wall of the communicating hole.

[0012] According to some embodiments of the present invention, the upper end of the self-relieving pressure member is provided with a sealing protrusion, the sealing protrusion protruding from the side wall of the sealing section, and the sealing protrusion being able to fit tightly against the opening of the connecting hole and seal the connecting hole.

[0013] According to some embodiments of the present invention, the lower end of the self-releasing pressure member is provided with a limiting protrusion, the limiting protrusion protruding from the side wall of the self-releasing pressure member; the opening and closing mechanism includes a stop platform, the stop platform is fixed to the lower part of the housing and disposed below the self-releasing pressure member, the stop platform can abut against the bottom of the limiting protrusion, the inflatable telescopic member drives the self-releasing pressure member to move downward when it expands and extends, the self-releasing pressure member can move upward relative to the movable end of the inflatable telescopic member and cause the exhaust section to pass upward through the connecting hole.

[0014] According to some embodiments of the present invention, the opening and closing mechanism further includes a reset platform, which is fixed to the air inlet cover. The reset platform is located above the self-releasing member and can abut against the top of the sealing protrusion when the inflatable telescopic member retracts and moves upward. The reset platform can cause the self-releasing member to move downward relative to the movable end of the inflatable telescopic member and make the connecting hole seal with the sealing section.

[0015] According to some embodiments of the present invention, the pneumatic device for relieving pressure of the needle valve further includes a return spring, which is disposed between the top of the driven member and the bottom of the housing, and the return spring enables the driven member to have a tendency to move towards the reset platform.

[0016] According to some embodiments of the present invention, the driven member includes a connecting cover and a top cylinder, the connecting cover being fixed below the receiving platform, the top cylinder being fixed below the connecting cover, and the inner cavity of the top cylinder communicating with the external atmosphere.

[0017] According to a second aspect of the present invention, the pneumatically controlled drain valve includes the pneumatic device for needle valve depressurization described in the above embodiments.

[0018] The water tank according to a third aspect of the present invention includes the pneumatically controlled drain valve described in the above embodiments.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram showing the disassembled structure of the first embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0022] Figure 2 This is a schematic diagram of the self-relieving pressure component in the first embodiment of the present invention;

[0023] Figure 3 This is a cross-sectional structural schematic diagram of the first embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0024] Figure 4 yes Figure 3 A partial view of A in the middle;

[0025] Figure 5 This is a schematic diagram of the first state of the first embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0026] Figure 6 This is a schematic diagram of the second state of the first embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0027] Figure 7 This is a schematic diagram of the third state of the first embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0028] Figure 8 This is a schematic diagram of the fourth state of the first embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0029] Figure 9 This is a schematic diagram of the second embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0030] Figure 10 This is a schematic diagram of the self-relieving pressure component in the second embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the third embodiment of the pneumatic device for needle valve pressure relief of the present invention;

[0032] Figure 12 This is a schematic diagram of the structure of the inflatable telescopic component of the present invention. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0035] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0036] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0037] See Figure 1 The first embodiment of this invention discloses a pneumatic device for needle valve pressure relief, including a housing 1, an air inlet cover 2, an inflation telescopic member 3, a driven member 4, and a self-relieving pressure member 6. The air inlet cover 2 is fixed to the upper part of the housing 1 and is sealed and connected to the inflation telescopic member 3. The air inlet cover 2 is connected to an external air pump. By pumping air into the inflation telescopic member 3, the air inlet cover 2 can inflate the inflation telescopic member 3. After inflation, the inflation telescopic member 3 can expand and extend within the housing 1. The driven member 4 is connected to the movable end of the inflation telescopic member 3 and moves with the movable end of the inflation telescopic member 3. After the inflation telescopic member 3 is fully inflated, the driven member 4 can reach the bottom of the housing 1. During the process of the driven member 4 reaching the bottom of the housing 1, the driven member 4 can push the external drain valve to gradually open and perform a drainage operation. The inflatable telescopic component 3 is an object that can produce elastic deformation after being inflated with gas, such as a telescopic folding airbag, a telescopic balloon, or a telescopic air membrane. In this embodiment, the inflatable telescopic component 3 is preferably a telescopic folding airbag. The telescopic folding airbag has a relatively stable elongation movement path and is suitable for use in a stable motion system.

[0038] See Figure 2 and Figure 3The pneumatic device for relieving pressure from the needle valve also includes an opening and closing mechanism 5. The self-releasing pressure member 6 is connected to the movable end of the inflatable telescopic member 3. The self-releasing pressure member 6 moves with the movable end of the inflatable telescopic member 3 when the inflatable telescopic member 3 inflates and expands or deflates and shortens. The self-releasing pressure member 6 is provided with an exhaust section 61. When the inflatable telescopic member 3 inflates and expands, the opening and closing mechanism 5 can isolate the exhaust section 61 from the inner cavity of the inflatable telescopic member 3, so that the inflatable telescopic member 3 can expand and expand without loss. After the inflatable telescopic member 3 is fully expanded and extended, the inflatable telescopic member 3 will drive the self-releasing pressure member 6 to contact the opening and closing mechanism. The opening and closing mechanism 5 can connect the exhaust section 61 with the inner cavity of the inflatable telescopic member 3 and cause the inflatable telescopic member 3 to deflate and contract. After the inflatable telescopic component 3 deflates and contracts, the driven component 4 will move upward along with the movable end component of the inflatable telescopic component 3. At this time, the external drain valve will gradually close and eventually close, thereby realizing the function of the inflatable telescopic component 3 automatically depressurizing and shutting off the water.

[0039] The beneficial effects of the first embodiment of the present invention are as follows:

[0040] The pneumatic device for relieving pressure on the needle valve in this embodiment of the invention includes an air inlet cover 2, an inflation telescopic component 3, a driven component 4, a self-releasing pressure component 6, and an opening and closing mechanism 5. The air inlet cover 2 is connected to an external air pump, which can fill the inflation telescopic component 3 with gas. Due to the increase in internal air pressure, the inflation telescopic component 3 will expand and elongate under the action of air pressure. During this process, the opening and closing mechanism 5 controls the exhaust section 61 in the self-releasing pressure component 6 to be isolated from the inner cavity of the inflation telescopic component 3, so that the gas in the inner cavity of the inflation telescopic component 3 will not leak, thereby enabling the inflation telescopic component 3 to expand and elongate normally without loss. During the elongation process, the force of the gas on the bottom of the inflation telescopic component 3 is greater than the opening and closing resistance of the external drain valve, thereby enabling the inflation telescopic component 3 to drive the driven component 4 to open the external drain valve and complete the triggering operation of the drain valve. After the inflatable telescopic component 3 is fully expanded and extended, the self-releasing pressure component 6 will contact the opening and closing mechanism 5. The opening and closing mechanism 5 pushes the self-releasing pressure component 6, making the inner cavity of the inflatable telescopic component 3 connected to the exhaust section 61. The inflatable telescopic component 3 deflates. Due to the decrease in internal air pressure, the force exerted by the air pressure on the bottom of the inflatable telescopic component 3 gradually decreases and becomes less than the opening and closing return force of the external drain valve or less than the elastic contraction force of the inflatable telescopic component 3 itself. This allows the drain valve to gradually reset and close the drain. Therefore, by using the self-releasing pressure component 6 and the opening and closing mechanism 5, the automatic depressurization of the inflatable telescopic component 3 can be achieved, saving additional components such as solenoid valves, and has the advantages of high efficiency in depressurization and low cost.

[0041] Specifically, see Figure 12 To ensure that the inflatable telescopic component 3 does not leak air or lose pump energy during expansion and elongation, a receiving platform 31 is provided at the bottom of the inflatable telescopic component 3. The receiving platform 31 has a connecting hole 311 within it. The self-releasing pressure component 6 can slide vertically within the connecting hole 311. The self-releasing pressure component 6 also has a sealing section 64, located above the exhaust section 61. To achieve a better seal, the sealing section 64 and the connecting hole 311 are interference-fitted. In this embodiment, appropriate damping is provided between the self-releasing pressure component 6 and the connecting hole 311, so that the frictional force between the self-releasing pressure component 6 and the connecting hole 311 is greater than the weight of the self-releasing pressure component 6. In other embodiments, the self-releasing pressure component 6 can also be provided with a larger weight to facilitate resetting. When the inflatable telescopic member 3 expands and elongates, the sidewall of the sealing section 64 can tightly adhere to the wall of the connecting hole 311 and seal the connecting hole 311, thereby ensuring the airtight state of the inner cavity of the inflatable telescopic member 3 and preventing energy loss of the air pump. When deflated and contracted, the exhaust section 61 can communicate with the inner cavity of the inflatable telescopic member 3 through the connecting hole 311, thereby realizing exhaust and pressure relief.

[0042] See Figure 4 In the first embodiment of the present invention, the exhaust section 61 is specifically provided with a venting groove 611. The venting groove 611 has a connecting end 6111 and an outlet end 6112. The connecting end 6111 is located at the upper end of the venting groove 611, and the outlet end 6112 is located at the lower end of the venting groove 611. The connecting end 6111 and the outlet end 6112 are interconnected through the groove body of the venting groove 611. When the connecting end 6111 passes upward through the connecting hole 311, the inner cavity of the inflatable telescopic member 3 can be vented and contracted through the connecting hole 311. During self-decompression, the connecting end 6111 will preferentially pass through the connecting hole 311 and connect with the inner cavity of the inflatable telescopic member 3. Subsequently, the gas in the inner cavity of the inflatable telescopic member 3 passes from the connecting end 6111 to the outlet end 6112 and is discharged from the outlet end 6112 to the outside atmosphere, thereby forming a decompression effect.

[0043] See Figure 9 and Figure 10The present invention also discloses a second embodiment, which differs from the first embodiment in that the exhaust section 61 is specifically provided with a venting column 612. The surface of the venting column 612 is continuous and complete without grooves. The venting column 612 is connected below the sealing section 64. The cross-sectional area of ​​the venting column 612 is smaller than the cross-sectional area of ​​the connecting hole 311. Therefore, when the venting column 612 is located on the connecting hole 311, the fit between the venting column 612 and the connecting hole 311 changes from an interference fit to a clearance fit. The wall surface of the venting column 612 forms an exhaust gap with the inner wall surface of the connecting hole 311, thereby allowing the air in the inner cavity of the inflatable telescopic member 3 to be discharged from the exhaust gap. Therefore, when the venting column 612 passes upward through the connecting hole 311, the inner cavity of the inflatable telescopic member 3 can be deflated and contracted through the connecting hole 311. In other embodiments, a combination of the first and second embodiments can be adopted, that is, while using the venting column 612 to relieve pressure, the venting groove 611 is added to the venting column 612 to expand the exhaust gap, thereby further improving the venting efficiency.

[0044] The upper end of the self-releasing pressure member 6 is provided with a sealing protrusion 62, which protrudes from the side wall of the sealing section 64. The sealing protrusion 62 can be used to seal the upper part of the connecting hole 311, and together with the side sealing effect of the sealing section 64, it can further enhance the sealing effect. It can also limit the range of downward movement of the self-releasing pressure member 6 relative to the inflatable telescopic member 3. The lower end of the self-releasing pressure member 6 is provided with a limiting protrusion 63, which protrudes from the side wall of the self-releasing pressure member 6. The limiting protrusion 63 is used to limit the range of upward movement of the self-releasing pressure member 6 relative to the inflatable telescopic member 3. The opening and closing mechanism 5 includes a stop platform 51, which is fixed to the lower part of the housing 1 and located below the self-releasing pressure member 6. When the inflatable telescopic member 3 expands and extends, it drives the self-releasing pressure member 6 to move downward. The self-releasing pressure member 6 can move upward relative to the movable end of the inflatable telescopic member 3 and allow the exhaust section 61 to pass upward through the connecting hole. Specifically, when the stop platform 51 abuts against the bottom of the limiting protrusion 63, the inflatable telescopic member 3 continues to move downward. Under the reaction force of the stop platform 51, the self-releasing pressure member 6 moves upward relative to the inflatable telescopic member 3, and the venting groove 611 or the venting column 612 also moves upward relative to the inflatable telescopic member 3. Finally, the venting groove 611 or the venting column 612 communicates with the inner cavity of the inflatable telescopic member 3, and the gas in the inner cavity of the inflatable telescopic member 3 is discharged.

[0045] In other embodiments, the self-releasing pressure member 6 can be equipped with a large self-weight, so that when the inflatable telescopic member 3 deflates and contracts, the self-releasing pressure member 6 can use its own weight to return to the receiving platform 31 and seal the connecting hole 311. In this embodiment, in order to enable the self-releasing pressure member 6 to return to its initial position after moving upward, the opening and closing mechanism 5 also includes a reset platform 52. The reset platform 52 is fixed on the air inlet cover 2 and is located above the self-releasing pressure member 6. When the inflatable telescopic member 3 deflates, the inflatable telescopic member 3 will contract and drive the self-releasing pressure member 6. When component 6 moves upward, it abuts against the top of the sealing protrusion 62 when it reaches a certain position. At this time, the inflatable telescopic component 3 continues to contract. Under the reaction force of the reset platform 52, the self-releasing component 6 moves downward relative to the movable end of the inflatable telescopic component 3. After moving to the limit position, the side wall of the sealing section 64 first fits against the wall of the connecting hole 311, so that the connecting hole 311 is restored to a seal. Then, the sealing protrusion 62 abuts against the receiving platform 31 to further strengthen the seal, and the connecting hole 311 is restored to a sealed state, thereby completing the reset.

[0046] The length of the exhaust section 61 is greater than the vertical thickness of the receiving platform 31. Thus, when the self-releasing pressure member 6 moves upward relative to the inflatable telescopic member 3, the upper end of the connecting end 6111 or the venting column 612 can enter the inner cavity of the inflatable telescopic member 3. Since the length of the exhaust section 61, i.e., the length of the venting groove 611 or the length of the venting column 612, is greater than the vertical thickness of the receiving platform 31, the lower end of the outlet end 6112 or the venting column 612 can remain below the receiving platform 31. This allows the gas in the inner cavity of the inflatable telescopic member 3 to pass through the gap between the venting groove 611 or the venting column 612 and the connecting hole 311, through the receiving platform 31, and be discharged from the outlet end 6112.

[0047] The length of the sealing section 64 is greater than the vertical thickness of the receiving platform 31. When the side wall of the sealing section 64 abuts against the wall of the connecting hole 311, the lower end of the connecting end 6111 or the venting column 612 can be located below the receiving platform 31. This prevents the connecting hole 311 from communicating with the connecting end 6111 or creating an exhaust gap with the venting column 612, further ensuring that the inflatable telescopic member 3 will not leak gas when it expands and elongates.

[0048] Furthermore, this invention can achieve the delayed water shut-off and precise control effects that can be achieved by ordinary solenoid valves when depressurizing the inflatable telescopic member 3. By reasonably setting the length of the sealing section 64, a relatively fixed delayed water shut-off and precise control effect can be achieved. When the external drain valve is opened, the sealing section 64 remains sealed with the connecting hole 311, and the sealing protrusion 62 is still on the receiving platform 31. During the continued expansion and elongation of the inflatable telescopic member 3, the external drain valve will gradually open, reaching its maximum opening when the limiting protrusion 63 touches the stop platform 51. During this process, the sealing section 64 remains sealed with the connecting hole 311. Subsequently, the self-releasing member 6 moves upward relative to the receiving platform 31, but because the upper end of the connecting end 6111 or the upper end of the venting column 612 is still connected to the sealing protrusion 62... At a certain vertical distance, the connecting hole 311 will not immediately connect with the inner cavity of the inflatable telescopic member 3. Before the upper end of the connecting end 6111 or the venting column 612 moves above the receiving platform 31, the external drain valve will remain at its maximum valve position. Only after the upper end of the connecting end 6111 or the venting column 612 moves above the receiving platform 31 will the upper end of the connecting end 6111 or the venting column 612 connect with the inner cavity of the inflatable telescopic member 3, causing the inflatable telescopic member 3 to deflate and contract, and the external drain valve to gradually close until it is completely closed. By reasonably setting the distance between the connecting end 6111 and the sealing protrusion 62, i.e., the length of the sealing section 64, and setting the friction between the self-releasing pressure member 6 and the connecting hole 311, the delayed water shut-off and precise control effects of ordinary solenoid valves when depressurizing the inflatable telescopic member 3 can be achieved. Therefore, with the above setup, a very simple structure can be used to replace the solenoid valve and related pipelines to achieve the pressure relief function, and it can also achieve the delayed water shut-off and precise control effects of the solenoid valve.

[0049] To drive the external drain valve, the driven member 4 includes a connecting cover 41 and a top cylinder 42. The connecting cover 41 is fixed below the receiving platform 31, thus allowing the driven member 4 to move along with the inflatable telescopic member 3. The top cylinder 42 is fixed below the connecting cover 41, and its inner cavity is in communication with the outside atmosphere. When the inflatable telescopic member 3 inflates and expands, it pushes the top cylinder 42 downwards, causing its bottom to contact the switch of the external drain valve, opening it. When the inflatable telescopic member 3 deflates, the gas inside its inner cavity enters the inner cavity of the top cylinder 42 through the exhaust section 61 and is then discharged into the outside atmosphere.

[0050] To limit the movement direction of the driven member 4, the housing 1 also includes a guide hole 11. The guide hole 11 is located at the bottom of the housing 1. The top cylinder 42 can be inserted into the guide hole 11 to move up and down, thereby ensuring that the inflatable telescopic member 3 and the driven member 4 can be aligned with the switch of the external drain valve, and also ensuring that the moving surface can be correctly stressed to achieve normal folding, denting and recovery.

[0051] The working principle and process of this invention are as follows:

[0052] See Figure 5 In the initial state, the top of the sealing protrusion 62 abuts against the reset platform 52, the sidewall of the sealing section 64 abuts against the wall of the connecting hole 311 to form a seal, and the lower surface of the sealing protrusion 62 abuts against the receiving platform 31 to further seal the connecting hole 311. Simultaneously, the venting section 61 is located below the receiving platform 31, and the venting section 61 is isolated from the inner cavity of the inflatable telescopic member 3. (See also...) Figure 6 When drainage is required, an external air pump begins to inflate the inner cavity of the inflatable telescopic member 3 through the air inlet cover 2. The air pressure is greater than the reset force of the external drain valve and / or the elastic restoring force of the inflatable telescopic member 3. The inflatable telescopic member 3 then expands and elongates, causing the driven member 4 to move downwards. After elongating to a certain length, the driven member 4 contacts the switch of the external drain valve and overcomes the switching resistance, opening the drain valve and thus achieving drainage. (See also...) Figure 7 As the inflatable telescopic member 3 continues to expand and elongate, the bottom of the limiting protrusion 63 of the self-releasing pressure member 6 located at the movable end of the inflatable telescopic member 3 will abut against the stop platform 51. Afterwards, the inflatable telescopic member 3 continues to elongate and pushes the self-releasing pressure member 6 further downward. However, due to the stopping effect of the stop platform 51, the self-releasing pressure member 6 will remain stationary relative to the stop platform 51. But as the movable end of the inflatable telescopic member 3 continues downward, the receiving platform 31 will gradually move downward. At this time, the external drain valve is still in the open state. From the time the receiving platform 31 leaves the sealing protrusion 62 until the receiving platform 31 is located at the connecting end 611... The time spent above the upper part of the vent column 612 is the delay time from valve opening to valve closing. Once the receiving platform 31 moves down to below the connecting end 6111 or below the upper part of the vent column 612, the inner cavity of the inflatable telescopic member 3 will communicate with the vent groove 611 or vent column 612 through the exhaust section 61 and the connecting hole 311. The air in the inflatable telescopic member 3 will be discharged to the outside atmosphere through the exhaust section 61, thereby achieving self-decompression without the need for other solenoid valves or other driving components. The structure is simplified, and it can achieve precise control of delayed valve closing, making the operation relatively reliable.

[0053] See Figure 8After depressurization, as the air pressure inside the inflatable telescopic member 3 gradually weakens, the reset force of the external drain valve and / or the elastic restoring force of the inflatable telescopic member 3 gradually exceed the air pressure. The inflatable telescopic member 3 will contract and drive the driven member 4 and the self-releasing member 6 to move upward. During the upward movement, the drain valve switch will gradually close to achieve automatic water shut-off. After moving to a certain height, the side wall of the sealing section 64 abuts against the wall of the connecting hole 311 to form a seal. The top of the sealing protrusion 62 will also abut against the reset platform 52. As the inflatable telescopic member 3 continues to contract and move upward, the receiving platform 31 will gradually approach the sealing protrusion 62 and finally abut against the sealing protrusion 62, thereby achieving reset.

[0054] See Figure 11 The present invention also discloses a third embodiment, which adds a reset structure based on the first or second embodiment. Specifically, the pneumatic device for depressurizing the needle valve further includes a reset spring 7, which is located between the top of the driven member 4 and the bottom of the housing 1. The reset spring 7 enables the driven member 4 to tend to move towards the reset platform 52. When the inflatable telescopic member 3 deflates and contracts, the reset spring 7 can work in conjunction with the restoring force of the external drain valve switch to reset the inflatable telescopic member 3 and the self-releasing member 6, resulting in a faster recovery speed and higher efficiency.

[0055] This invention uses the movable self-releasing pressure member 6 and a simple opening and closing mechanism 5. By utilizing the elongation and shortening characteristics of the inflatable telescopic member 3, the self-releasing pressure function of the inflatable telescopic member 3 can be realized. Moreover, by setting the ratio of the length of the sealing section 64 to the vertical thickness of the receiving platform 31, the effect of precise control and delayed water shut-off when the solenoid valve is depressurized can be achieved. This invention can achieve the beneficial effects of complex systems while saving complex components, pipes and circuit systems. Therefore, it has the advantages of very simple structure, reliable operation and simplified structure.

[0056] This invention also discloses a pneumatically controlled exhaust valve and a water tank (not shown in the figure). Both the pneumatically controlled exhaust valve and the water tank include a pneumatic device for needle valve pressure relief as described above. The pneumatic device for needle valve pressure relief is provided with an inflation telescopic member 3, a driven member 4, a self-releasing member 6, and an opening and closing mechanism 5. By inflating the inflation telescopic member 3, the driven member 4 can be driven to open the drain valve in the pneumatically controlled water tank, thereby realizing drainage. Then, using the stop plate 51 in the opening and closing mechanism 5, the self-releasing member 6 is stopped as it moves with the movable end of the inflation telescopic member 3, so that the self-releasing member 6 can be inserted into the inner cavity of the inflation telescopic member 3. The exhaust section 61 in the self-releasing member 6 will communicate with the inner cavity of the inflation telescopic member 3, thereby automatically depressurizing the inflation telescopic member 3. Without the need for additional solenoid valves, pipelines, and circuits, this embodiment of the invention can achieve the self-decompression function of the inflatable telescopic component 3 by setting a simple self-decompression component 6 and an opening and closing mechanism 5. Therefore, it has the advantages of simple structure, reliable operation, and cost saving.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A pneumatic device for relieving pressure from a needle valve, characterized in that, The device includes a housing, an air inlet cover, an inflatable telescopic component, a driven component, and a self-releasing component. The air inlet cover is fixed to the upper part of the housing and is in sealed communication with the inflatable telescopic component. The air inlet cover can inflate the inflatable telescopic component. After inflation, the inflatable telescopic component can expand and extend within the housing. The driven component is connected to the movable end of the inflatable telescopic component and can reach the bottom of the housing. The bottom of the inflatable telescopic component is provided with a receiving platform, and the receiving platform is provided with a connecting hole. The pneumatic device for relieving pressure of the needle valve also includes an opening and closing mechanism. The self-relieving pressure member is connected to the movable end of the inflatable telescopic member. The self-relieving pressure member can slide vertically in the connecting hole. The self-relieving pressure member is provided with an exhaust section. The exhaust section is provided with an air vent column. The cross-sectional area of ​​the air vent column is smaller than the cross-sectional area of ​​the connecting hole. When the inflatable telescopic member is inflated, the opening and closing mechanism can isolate the venting section and the inner cavity of the inflatable telescopic member from each other; after the inflatable telescopic member is fully expanded and extended, the opening and closing mechanism can allow the venting column to pass upward through the connecting hole, and allow the inner cavity of the inflatable telescopic member to vent and contract through the gap between the connecting hole and the venting column. The self-relieving pressure component is also provided with a sealing section, which is located above the exhaust section. The sidewall of the sealing section is sealed by being tightly attached to the wall of the connecting hole. The upper end of the self-relieving component is provided with a sealing protrusion. The sealing protrusion protrudes from the side wall of the sealing section and can fit tightly against the opening of the connecting hole to seal the connecting hole. The lower end of the self-releasing pressure member is provided with a limiting protrusion, which protrudes from the side wall of the self-releasing pressure member; the opening and closing mechanism includes a stop platform, which is fixed to the lower part of the housing and located below the self-releasing pressure member. The stop platform can abut against the bottom of the limiting protrusion. When the inflatable telescopic member expands and extends, it drives the self-releasing pressure member to move downward. The self-releasing pressure member can move upward relative to the movable end of the inflatable telescopic member and allow the exhaust section to pass upward through the connecting hole. The opening and closing mechanism also includes a reset platform, which is fixed to the air inlet cover. The reset platform is located above the self-releasing pressure member and can abut against the top of the sealing protrusion when the inflatable telescopic member retracts and moves upward. The reset platform can cause the self-releasing pressure member to move downward relative to the movable end of the inflatable telescopic member and make the connecting hole seal with the sealing section.

2. The pneumatic device for relieving pressure from a needle valve according to claim 1, characterized in that, The length of the vent column is greater than the vertical thickness of the receiving platform.

3. The pneumatic device for relieving pressure from a needle valve according to claim 1, characterized in that, The pneumatic device for relieving pressure from the needle valve also includes a return spring, which is located between the top of the driven member and the bottom of the housing. The return spring enables the driven member to tend to move towards the reset platform.

4. The pneumatic device for relieving pressure from a needle valve according to claim 1, characterized in that, The driven component includes a connecting cover and a top cylinder. The connecting cover is fixed below the receiving platform, and the top cylinder is fixed below the connecting cover. The inner cavity of the top cylinder is in communication with the external atmosphere.

5. A pneumatically controlled drain valve, characterized in that, The pneumatic device for relieving pressure from a needle valve as described in any one of claims 1-4.

6. A water tank, characterized in that, Includes the pneumatically controlled drain valve as described in claim 5.

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