A needle valve pressure relief pneumatic device, a pneumatic drainage valve and a 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, wherein external air pump is connected with air inlet cover, gas can be filled into inflatable telescopic piece, 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 expand and extend, and drive driven part to open external drainage valve to drain water.Drainage is completed, and inflatable telescopic piece continues to extend to fully expand, 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 communication hole and exhaust column of exhaust section, and the exhaust groove of exhaust column, so that drainage valve can gradually reset and close drainage, realize automatic pressure relief, and exhaust column is additionally provided with exhaust groove, which expands exhaust gap and improves exhaust efficiency.

Description

[0001] The present application is a divisional application of the application with the application date of "2021.11.29", the application number of "202111436971.7", and the application name of "A needle valve pressure relief pneumatic device, a gas control drainage valve and a water tank". TECHNICAL FIELD

[0002] The present application relates to the technical field of pneumatic devices, in particular to a needle valve pressure relief pneumatic device, a gas control drainage valve and a water tank. BACKGROUND

[0003] In traditional toilet bowls, mechanical drainage valves are mostly used to drain the water tank. When drainage is needed, the drainage valve is usually driven to open by manually pressing, thereby realizing drainage. With the improvement of people's quality of life, non-contact drainage valves are gradually applied to intelligent toilet bowls. Due to the lack of manual pressing mechanical drive, the non-contact drainage valve needs an additional pneumatic device to trigger the start of the drainage valve.

[0004] The commonly used pneumatic device on the market is composed of a gas pump, an air bag and a pressure relief valve. When drainage is needed, the gas pump is started to inflate the air bag. After the air bag is inflated, it expands and elongates to drive the driven rod to trigger the drainage valve. However, since the existing pneumatic devices on the market do not have a pressure relief function, in order to realize the pressure relief function of the pneumatic device, the existing pneumatic device usually needs to be equipped with a special pressure relief module and an electromagnetic valve to exhaust the air bag through gas path conversion to realize pressure relief. However, this scheme needs to additionally increase the electromagnetic valve and the pipeline, circuit and other components, which has high cost, complex structure, large space occupation, messy internal wiring, and is very troublesome to assemble and maintain. In addition, part of the existing pneumatic devices are provided with an automatic pressure relief structure which realizes pressure relief by air bag deflation, but has the problem of slow deflation speed. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a needle valve pressure relief pneumatic device which can automatically relieve pressure after inflation, is reliable in operation and has a very simple structure, can save electrical components and has low cost.

[0006] According to the needle valve pressure relief pneumatic device of the first aspect of the present application, the device comprises a shell, an air inlet cover, an inflatable telescopic member, a follower and a self-pressure relief member. The air inlet cover is fixed on the upper part of the shell and is in sealed communication with the inflatable telescopic member. The air inlet cover can be inflated into the inflatable telescopic member. The inflatable telescopic member can be inflated and elongated in the shell. The follower is connected to the movable end of the inflatable telescopic member and can reach the bottom of the shell. The needle valve pressure relief pneumatic device further comprises an opening and closing mechanism. The self-pressure relief member is connected to the movable end of the inflatable telescopic member and is provided with an exhaust section. When inflated, the opening and closing mechanism can isolate the exhaust section from the inner cavity of the inflatable telescopic member. After the inflatable telescopic member is fully inflated and elongated, the opening and closing mechanism can make the exhaust section communicate with the inner cavity of the inflatable telescopic member and deflate the inflatable telescopic member.

[0007] According to some embodiments of the present application, the bottom of the inflatable telescopic member is provided with a receiving platform. The receiving platform is provided with a communication hole. The self-pressure relief member can vertically slide in the communication hole. The self-pressure relief member is further provided with a sealing section. The sealing section is located above the exhaust section. The side wall of the sealing section can tightly adhere to the hole wall of the communication hole and seal the communication hole.

[0008] According to some embodiments of the present application, the exhaust section can communicate with the inner cavity of the inflatable telescopic member through the communication hole.

[0009] According to some embodiments of the present application, the exhaust section is provided with a deflation groove. The deflation groove is provided with a communication end and an exhaust end. The communication end is located at the upper end of the deflation groove. The exhaust end is located at the lower end of the deflation groove. The communication end and the exhaust end communicate with each other through the groove body of the deflation groove. When the communication end passes through the communication hole upward, the inner cavity of the inflatable telescopic member can deflate and contract through the communication hole.

[0010] According to some embodiments of the present application, the exhaust section is provided with a deflation column. The surface of the deflation column is continuous and complete. The deflation column is connected below the sealing section. The cross-sectional area of the deflation column is smaller than that of the communication hole. When the deflation column passes through the communication hole upward, the inner cavity of the inflatable telescopic member can deflate and contract through the gap between the communication hole and the deflation column.

[0011] According to some embodiments of the present application, the upper end of the self-pressure relief member is provided with a sealing protrusion. The sealing protrusion protrudes from the side wall of the sealing section. The sealing protrusion can tightly adhere to the opening of the communication hole and seal the communication hole. The lower end of the self-pressure relief member is provided with a limiting protrusion. The limiting protrusion protrudes from the side wall of the self-pressure relief member.

[0012] According to some embodiments of the present application, the opening and closing mechanism comprises a stop platform, which is fixed to the lower part of the shell and arranged below the self-pressure relief member, and is capable of abutting against the bottom of the limiting block and preventing the self-pressure relief member from moving downward, and after the inflatable telescopic member is fully inflated and elongated, the self-pressure relief member is capable of moving upward relative to the movable end of the inflatable telescopic member and allowing the exhaust section to pass through the communication hole upward.

[0013] According to some embodiments of the present application, the length of the exhaust section and the length of the sealing section are both greater than the vertical thickness of the receiving platform.

[0014] According to some embodiments of the present application, the opening and closing mechanism further comprises a reset platform, which is fixed to the air inlet cover and arranged above the self-pressure relief member, and is capable of abutting against the top of the sealing block when the inflatable telescopic member is contracted and moves upward, and the reset platform is capable of moving the self-pressure relief member downward relative to the movable end of the inflatable telescopic member and allowing the communication hole to tightly contact with the sealing section to restore the sealing state.

[0015] According to some embodiments of the present application, the pneumatic device further comprises a reset spring, which is arranged between the top of the driven member and the bottom of the shell, and the reset spring is capable of allowing the driven member to have a tendency to move toward the reset platform.

[0016] According to some embodiments of the present application, the driven member comprises 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, and the inner cavity of the top cylinder is in communication with the external atmosphere.

[0017] According to some embodiments of the present application, the shell comprises a guide hole, which is arranged at the bottom of the shell, and the top cylinder is capable of being inserted into the guide hole to move upward and downward.

[0018] The air-controlled drainage valve according to the second aspect of the embodiments of the present application comprises the pneumatic device for needle valve pressure relief as described in the above embodiments.

[0019] The water tank according to the third aspect of the embodiments of the present application comprises the pneumatic device for needle valve pressure relief as described in the above embodiments.

[0020] The pneumatic device of the needle valve pressure relief provided with an air inlet cover, an inflation telescopic part, a driven part, a self-pressure relief part and an opening and closing mechanism, wherein an external air pump is connected with the air inlet cover, and can charge air into the inflation telescopic part, and the opening and closing mechanism can isolate the exhaust section and the inner cavity of the inflation telescopic part from each other during inflation, so that the inflation telescopic part can expand and elongate without loss and quickly, and drive the driven part to open the external drain valve to drain water. After the water is drained, the inflation telescopic part is elongated to the position, the trigger part of the self-pressure relief mechanism opens the air exhaust hole, the inflation telescopic part is deflated, the opening and closing mechanism can make the exhaust section and the inner cavity of the inflation telescopic part communicate and deflate the inflation telescopic part, so that the drain valve can be gradually reset and closed, and thus the self-pressure relief part and the opening and closing mechanism can realize automatic pressure relief, and save additional electromagnetic valves and other components, and have the advantages of high pressure relief efficiency and low cost.

[0021] The self-pressure relief part and the simple opening and closing mechanism are used, the inflation telescopic part itself is elongated and shortened, the self-pressure relief function of the inflation telescopic part is realized, the length of the exhaust section and the vertical thickness of the receiving platform are set in proportion, the effect of accurate control and delayed water closing during electromagnetic valve pressure relief is realized, the complex components, pipelines and circuit systems are saved, the beneficial effects of the complex system are achieved, and thus the application has the advantages of simple structure, reliable operation and simple structure.

[0022] Additional aspects and advantages of the application will be described in part below, will become apparent from the following description, or will be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below in combination with the drawings and embodiments, wherein:

[0024] Figure 1 is a split structure schematic diagram of the first embodiment of the pneumatic device of the application;

[0025] Figure 2 is a structure schematic diagram of the self-pressure relief part in the first embodiment of the application;

[0026] Figure 3 is a cross-sectional structure schematic diagram of the first embodiment of the pneumatic device of the application;

[0027] Figure 4 is Figure 3 is a partial view of A in FIG. 8;

[0028] Figure 5 is a schematic diagram of the first state of the first embodiment of the pneumatic device of the application;

[0029] Figure 6 is a schematic view of a second state of the first embodiment of the pneumatic device of the present application;

[0030] Figure 7 is a schematic view of a third state of the first embodiment of the pneumatic device of the present application;

[0031] Figure 8 is a schematic view of a fourth state of the first embodiment of the pneumatic device of the present application;

[0032] Figure 9 is a schematic view of the structure of the second embodiment of the pneumatic device of the present application;

[0033] Figure 10 is a schematic view of the structure of the self-pressure relief member in the second embodiment of the pneumatic device of the present application;

[0034] Figure 11 is a schematic view of the structure of the third embodiment of the pneumatic device of the present application;

[0035] Figure 12 is a schematic view of the structure of the inflatable telescopic member of the present application. DETAILED DESCRIPTION

[0036] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein the same or similar components have the same or similar designations throughout the several views. The embodiments described below are examples of the present application, and are not intended to limit the present application.

[0037] In the description of the present application, it is to be understood that the orientation description, such as the upper, lower, and the like, is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0038] In the description of the present application, the plural refers to two or more. If there is a description of the first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated or the sequence of technical features indicated.

[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, and the like should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0040] Reference is made to Figure 1The first embodiment of the present application discloses a pneumatic device, comprising a shell 1, an air inlet cover 2, an inflatable telescopic member 3, a follower 4 and a self pressure relief member 6, the air inlet cover 2 is fixed on the upper part of the shell 1 and is in sealed communication with the inflatable telescopic member 3, the air inlet cover 2 is in communication with an external air pump, and the inflatable telescopic member 3 can be inflated by the external air pump, the inflatable telescopic member 3 can be expanded and elongated in the shell 1 after being inflated, the follower 4 is connected to the movable end of the inflatable telescopic member 3, and the follower 4 can move along with the movable end of the inflatable telescopic member 3, and the follower 4 can reach the bottom of the shell 1 after the inflatable telescopic member 3 is fully expanded. In the process that the follower 4 reaches the bottom of the shell 1, the follower 4 can push an external drain valve to gradually open and perform a drainage operation. The inflatable telescopic member 3 is an object that can produce elastic deformation after being inflated, such as a telescopic folding air bag, a telescopic balloon, a telescopic air film and the like, in the embodiment, the inflatable telescopic member 3 is preferably a telescopic folding air bag, and the telescopic folding air bag has a relatively stable elongation movement path and is suitable for use in a stable movement system.

[0041] Referring to Figure 2 and Figure 3 , the pneumatic device further comprises an opening and closing mechanism 5, the self pressure relief member 6 is connected to the movable end of the inflatable telescopic member 3, and the self pressure relief member 6 can move along with the movable end of the inflatable telescopic member 3 when the inflatable telescopic member 3 is inflated, expanded and elongated or deflated, shortened, wherein the self pressure relief member 6 is provided with an exhaust section 61, the opening and closing mechanism 5 can isolate the exhaust section 61 and the inner cavity of the inflatable telescopic member 3 from each other when the inflatable telescopic member 3 is inflated, expanded and elongated, so that the inflatable telescopic member 3 can be expanded and elongated without loss, and the inflatable telescopic member 3 can drive the self pressure relief member 6 to touch the opening and closing structure after the inflatable telescopic member 3 is fully expanded and elongated, the opening and closing mechanism 5 can make the exhaust section 61 communicate with the inner cavity of the inflatable telescopic member 3 and make the inflatable telescopic member 3 deflate and contract. After the inflatable telescopic member 3 deflates and contracts, the follower 4 moves upward along with the movable end assembly of the inflatable telescopic member 3, at this time, the opening and closing of the external drain valve will gradually close and finally close, so as to realize the function that the inflatable telescopic member 3 is automatically pressure relieved and water is closed.

[0042] The beneficial effects of the first embodiment of the present application are as follows:

[0043] The pneumatic device of the embodiment of the present application is provided with an air inlet cover 2, an inflation telescopic part 3, a driven part 4, a self-pressure relief part 6 and an opening and closing mechanism 5. The air inlet cover 2 is connected with an external air pump, and the air pump can fill the inflation telescopic part 3 with air. Due to the increase of the internal air pressure, the inflation telescopic part 3 will expand and elongate under the pushing of the air pressure force. In this process, the opening and closing mechanism 5 will control the exhaust section 61 of the self-pressure relief part 6 to be isolated from the inner cavity of the inflation telescopic part 3, so that the air in the inner cavity of the inflation telescopic part 3 will not leak, thereby enabling the inflation telescopic part 3 to expand and elongate normally and without loss. In the elongation process, the force of the air on the bottom of the inflation telescopic part 3 is greater than the opening and closing resistance of the external drain valve, so that the inflation telescopic part 3 can drive the driven part 4 to open the external drain valve, thereby completing the triggering operation of the drain valve. After the inflation telescopic part 3 completely expands and elongates, the self-pressure relief part 6 will touch the opening and closing mechanism 5, the opening and closing mechanism 5 pushes the self-pressure relief part 6, so that the inner cavity of the inflation telescopic part 3 is communicated with the exhaust section 61, and the inflation telescopic part 3 leaks air. Due to the decrease of the internal air pressure, the force of the air pressure on the bottom of the inflation telescopic part 3 gradually decreases and is less than the opening and closing restoring force of the external drain valve or the elastic contraction force of the inflation telescopic part 3 itself, so that the drain valve can gradually reset and close the drain. Therefore, by using the self-pressure relief part 6 and the opening and closing mechanism 5, the automatic pressure relief of the inflation telescopic part 3 can be realized, and the additional electromagnetic valve and other components are saved, which has the advantages of high pressure relief efficiency and low cost.

[0044] Specifically, referring to Figure 12 , in order to ensure that the inflation telescopic part 3 does not leak air and lose air pump energy during expansion and elongation, the bottom of the inflation telescopic part 3 is provided with a receiving platform 31, the receiving platform 31 is provided with a communication hole 311, the self-pressure relief part 6 can vertically slide in the communication hole 311, the self-pressure relief part 6 is also provided with a sealing section 64, the sealing section 64 is located above the exhaust section 61, and in order to achieve better sealing, the sealing section 64 and the communication hole 311 are in interference fit. In this embodiment, a suitable damping is provided between the self-pressure relief part 6 and the communication hole 311, so that the friction between the self-pressure relief part 6 and the communication hole 311 is greater than the weight of the self-pressure relief part 6. In other embodiments, the self-pressure relief part 6 can also have a large weight to facilitate resetting. When the inflation telescopic part 3 expands and elongates, the side wall of the sealing section 64 can tightly adhere to the hole wall of the communication hole 311 and seal the communication hole 311, thereby ensuring the sealing state of the inner cavity of the inflation telescopic part 3 and avoiding the loss of air pump energy. When the inflation telescopic part 3 contracts, the exhaust section 61 can be communicated with the inner cavity of the inflation telescopic part 3 through the communication hole 311, thereby achieving exhaust pressure relief.

[0045] Referring to Figure 4 In the first embodiment of the present application, the exhaust section 61 is specifically provided with a vent groove 611, which is provided with a communication end 6111 and an exhaust end 6112. The communication end 6111 is located at the upper end of the vent groove 611, and the exhaust end 6112 is located at the lower end of the vent groove 611. The communication end 6111 and the exhaust end 6112 are in communication with each other through the groove body of the vent groove 611. When the communication end 6111 passes through the communication hole 311 upward, the inner cavity of the inflatable telescopic member 3 can be deflated and contracted through the communication hole 311. When self-venting is performed, the communication end 6111 will pass through the communication hole 311 first to communicate with the inner cavity of the inflatable telescopic member 3, and then the gas in the inner cavity of the inflatable telescopic member 3 will pass from the communication end 6111 to the exhaust end 6112 and be discharged to the outside atmosphere from the exhaust end 6112, thereby forming a venting effect.

[0046] Referring to Figure 9 and Figure 10 The present application also discloses a second embodiment, which is different from the first embodiment in that the exhaust section 61 is specifically provided with a venting column 612, which has a surface that is continuous and complete without recesses. The venting column 612 is connected below the sealing section 64. The cross-sectional area of the venting column 612 is smaller than that of the communication hole 311. Therefore, when the venting column 612 is located on the communication hole 311, the cooperation mode of the venting column 612 and the communication hole 311 will change from interference fit to clearance fit. The wall surface of the venting column 612 will form an exhaust gap with the inner wall surface of the communication hole 311, so that the gas in the inner cavity of the inflatable telescopic member 3 will be discharged from the exhaust gap. Therefore, when the venting column 612 passes through the communication hole 311 upward, the inner cavity of the inflatable telescopic member 3 can be deflated and contracted through the communication hole 311. In other embodiments, a combination of the first embodiment and the second embodiment can also be used, that is, the venting column 612 is used for venting at the same time, and the vent groove 611 is added on the venting column 612 to expand the exhaust gap, thereby further improving the efficiency of venting.

[0047] The upper end of the self-pressure relief 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 communication hole 311. The sealing effect can be further enhanced by the side sealing effect of the sealing section 64. The sealing protrusion 62 can also be used to limit the range of downward movement of the self-pressure relief member 6 relative to the inflatable telescopic member 3. The lower end of the self-pressure relief member 6 is provided with a limiting protrusion 63 which protrudes from the side wall of the self-pressure relief member 6. The limiting protrusion 63 is used to limit the range of upward movement of the self-pressure relief member 6 relative to the inflatable telescopic member 3. The opening and closing mechanism 5 includes a blocking platform 51 which is fixed to the lower part of the shell 1 and is located below the self-pressure relief member 6. When the inflatable telescopic member 3 is expanded and elongated, the self-pressure relief member 6 is driven to move downward. The self-pressure relief member 6 can move upward relative to the movable end of the inflatable telescopic member 3 and make the exhaust section 61 pass through the communication hole. Specifically, when the blocking platform 51 can abut against the bottom of the limiting protrusion 63, the inflatable telescopic member 3 continues to move downward. Under the action of the blocking platform 51, the self-pressure relief member 6 moves upward relative to the inflatable telescopic member 3. The gas discharge groove 611 or the gas discharge column 612 also moves upward relative to the inflatable telescopic member 3. Finally, the gas discharge groove 611 or the gas discharge column 612 is in communication with the inner cavity of the inflatable telescopic member 3. The gas in the inner cavity of the inflatable telescopic member 3 is discharged.

[0048] In other embodiments, the self-pressure relief member 6 can have a large self-weight. When the inflatable telescopic member 3 is deflated and contracted, the self-pressure relief member 6 can return to the receiving platform 31 by using the self-weight to seal the communication hole 311. In the present embodiment, in order to make the self-pressure relief member 6 move upward and return to the initial position, the opening and closing mechanism 5 further includes a resetting platform 52 which is fixed to the air inlet cover 2 and is located above the self-pressure relief member 6. When the inflatable telescopic member 3 is deflated, the inflatable telescopic member 3 is contracted and drives the self-pressure relief member 6 to move upward. When the self-pressure relief member 6 reaches a certain position, the self-pressure relief member 6 can abut against the top of the sealing protrusion 62. At this time, the inflatable telescopic member 3 continues to contract. Under the action of the resetting platform 52, the self-pressure relief member 6 moves downward relative to the movable end of the inflatable telescopic member 3. When the self-pressure relief member 6 reaches the limit position, the side wall of the sealing section 64 first abuts against the hole wall of the communication hole 311 to restore the sealing of the communication hole 311. Then, the sealing protrusion 62 abuts against the receiving platform 31 to further enhance the sealing. The communication hole 311 is in a state of restored sealing. Thus, the resetting is completed.

[0049] The length of the exhaust section 61 is greater than the vertical thickness of the receiving platform 31, so that when the self-pressure relief member 6 moves upward relative to the gas-filled telescopic member 3, the upper end of the communication end 6111 or the exhaust column 612 can enter the inner cavity of the gas-filled telescopic member 3, and due to the length of the exhaust section 61, i.e., the groove length of the exhaust groove 611 or the length of the exhaust column 612 is greater than the vertical thickness of the receiving platform 31, the lower end of the gas outlet end 6112 or the exhaust column 612 can be kept below the receiving platform 31, so that the gas in the inner cavity of the gas-filled telescopic member 3 can pass through the receiving platform 31 and be discharged from the gas outlet end 6112 through the gap between the exhaust groove 611 or the exhaust column 612 and the communication hole 311.

[0050] The length of the sealing section 64 is greater than the vertical thickness of the receiving platform 31, so that when the side wall of the sealing section 64 abuts against the hole wall of the communication hole 311, the lower end of the communication end 6111 or the exhaust column 612 can be located below the receiving platform 31, so that the communication hole 311 does not communicate with the communication end 6111 or produce an exhaust gap with the exhaust column 612, which can further ensure that the gas-filled telescopic member 3 does not leak gas when it is expanded and elongated.

[0051] In addition, the present application can achieve the effect of delay water closing and accurate control that can be achieved by the ordinary electromagnetic valve when the said inflatable telescopic member 3 is depressurized. By reasonably setting the length of the said sealing section 64, the effect of relatively fixed delay water closing and accurate control can be achieved. When the external drain valve is opened, the said sealing section 64 is still in a sealed state with the said communication hole 311, and the said sealing block 62 is still on the said receiving platform 31. In the process of the said inflatable telescopic member 3 continuing to expand and elongate, the external drain valve will gradually open, and reach the maximum opening when the said limiting block 63 touches the said gear platform 51. In this process, the said sealing section 64 is always in a sealed state with the said communication hole 311. Then the said self-depressurizing member 6 moves upward relative to the said receiving platform 31, but because there is a certain vertical distance between the said communication end 6111 or the upper end of the said air release column 612 and the said sealing block 62, the said communication hole 311 will not immediately communicate with the inner cavity of the said inflatable telescopic member 3. The external drain valve will always maintain the maximum valve degree before the said communication end 6111 or the upper end of the said air release column 612 moves above the said receiving platform 31. Only after the said communication end 6111 or the upper end of the said air release column 612 moves above the said receiving platform 31, the said communication end 6111 or the upper end of the said air release column 612 will communicate with the inner cavity of the said inflatable telescopic member 3, so that the said inflatable telescopic member 3 shrinks, and the external drain valve begins to gradually close until it is completely closed. By reasonably setting the distance between the said communication end 6111 and the said sealing block 62, i.e. the length of the said sealing section 64, and setting the friction between the said self-depressurizing member 6 and the said communication hole 311, the effect of delay water closing and accurate control that can be achieved by the ordinary electromagnetic valve when the said inflatable telescopic member 3 is depressurized can be achieved. Therefore, by the above setting, the electromagnetic valve and related pipelines can be replaced by a very simple structure to achieve the function of depressurization, and the effect of delay water closing and accurate control of the electromagnetic valve can also be achieved.

[0052] In order to be able to drive the external drain valve, the said driven member 4 includes a connecting cover 41 and a top cylinder 42. The connecting cover 41 is fixed below the said receiving platform 31, so that the said driven member 4 can move with the said inflatable telescopic member 3. The top cylinder 42 is fixed below the connecting cover 41, and the inner cavity of the top cylinder 42 communicates with the external atmosphere. When the said inflatable telescopic member 3 inflates and expands, the said inflatable telescopic member 3 will push the top cylinder 42 to move downward, and the bottom of the top cylinder 42 will touch the switch of the external drain valve to open the drain valve. When the said inflatable telescopic member 3 deflates, the gas in the inner cavity of the said inflatable telescopic member 3 will enter the inner cavity of the top cylinder 42 from the said air release section 61, and be discharged from the inner cavity of the top cylinder 42 to the external atmosphere.

[0053] In order to limit the movement direction of the follower 4, the shell 1 further comprises a guide hole 11 arranged at the bottom of the shell 1, the top cylinder 42 can be inserted into the guide hole 11 to move up and down, so as to ensure that the inflatable telescopic member 3 and the follower 4 can be aligned with the opening and closing of the external drain valve, and also ensure that the movable surface can be correctly stressed to realize normal folding recess and recovery.

[0054] The working principle and working process of the present application are as follows:

[0055] Referring to Figure 5 In the initial state, the top of the sealing block 62 abuts against the reset table 52, the side wall of the sealing section 64 abuts against the hole wall of the communication hole 311 to form a seal, and the lower surface of the sealing block 62 abuts against the receiving platform 31 to further seal the communication hole 311, at the same time, the exhaust section 61 is located below the receiving platform 31, and the exhaust section 61 is isolated from the inner cavity of the inflatable telescopic member 3. Figure 6 When drainage is needed, the external air pump starts 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 recovery force of the inflatable telescopic member 3, the inflatable telescopic member 3 starts to expand and elongate and drives the follower 4 to move downward, after elongating to a certain length, the follower 4 touches the switch of the external drain valve and overcomes the switch resistance to open the drain valve, thereby realizing drainage. Figure 7 The inflatable telescopic member 3 continues to expand and elongate, the limit block 63 at the bottom of the self-pressure relief member 6 located at the movable end of the inflatable telescopic member 3 abuts against the stop table 51, thereafter the inflatable telescopic member 3 continues to elongate and drives the self-pressure relief member 6 to continue to move downward, but due to the stop effect of the stop table 51, the self-pressure relief member 6 is stationary relative to the stop table 51, but as the movable end of the inflatable telescopic member 3 continues to move downward, the receiving platform 31 gradually moves downward, at this time, the external drain valve is still in the open state, from the time when the receiving platform 31 moves away from the sealing block 62 to the time when the receiving platform 31 is located above the communication end 6111 or above the upper end of the exhaust column 612, it is the delay time from opening to closing, once the receiving platform 31 moves down to below the communication end 6111 or below the upper end of the exhaust column 612, the inner cavity of the inflatable telescopic member 3 is communicated with the exhaust groove 611 or the exhaust column 612 through the exhaust section 61 passing through the communication hole 311, the air in the inflatable telescopic member 3 is discharged to the outside atmosphere through the exhaust section 61, thereby realizing self-pressure relief without the action of other driving members such as electromagnetic valves, the structure is simple, and accurate control of delay closing can be realized, and the operation is relatively reliable.

[0056] Referring to Figure 8After pressure relief, due to the gradual weakening of the air pressure force inside the inflatable telescopic member 3, the restoring force of the external drain valve and / or the elastic restoring force of the inflatable telescopic member 3 gradually become greater than the air pressure force, the inflatable telescopic member 3 will shrink and drive the driven member 4 and the self-pressure relief member 6 to move upwards, in the process of moving upwards, the drain valve switch will gradually close to achieve automatic water stop, after moving upwards to a certain height, the side wall of the sealing section 64 abuts against the hole wall of the communication hole 311 to form a seal first, the top of the sealing block 62 also abuts against the reset platform 52, and since the inflatable telescopic member 3 continues to shrink and move upwards, the receiving platform 31 gradually approaches the sealing block 62 and finally abuts against the sealing block 62, thereby achieving reset.

[0057] Referring to Figure 11 The application also discloses a third embodiment, which is based on the first embodiment or the second embodiment and adds a reset structure, specifically, the pneumatic device further comprises a reset spring 7, which is arranged between the top of the driven member 4 and the bottom of the shell 1, and the reset spring 7 can make the driven member 4 have a tendency to move towards the reset platform 52. When the inflatable telescopic member 3 is deflated and shrinks, the reset spring 7 can reset the inflatable telescopic member 3 and the self-pressure relief member 6 in cooperation with the restoring force of the external drain valve switch, has a faster recovery speed and is more efficient.

[0058] The application uses the movable self-pressure relief member 6 and the simple opening and closing mechanism 5, utilizes the elongation and shortening characteristics of the inflatable telescopic member 3 itself, and can realize the self-pressure relief function of the inflatable telescopic member 3, and by setting the ratio of the length of the sealing section 64 and the vertical thickness of the receiving platform 31, the accurate control and delayed water stop effect during electromagnetic valve pressure relief can be realized, the application saves complex components, pipelines and circuit systems, and also achieves the beneficial effects of a complex system, and therefore has the advantages of simple structure, reliable operation and simple structure.

[0059] The embodiment of the present application also discloses a gas control exhaust valve and a water tank (not shown in the figure), both of which comprise the pneumatic device as described above, which is provided with the inflatable telescopic member 3, the driven member 4, the self-pressure relief member 6 and the opening and closing mechanism 5, the opening and closing of the drain valve in the gas control water tank can be realized by driving the driven member 4 to open the switch of the drain valve in the gas control water tank through inflating the inflatable telescopic member 3, thereby realizing drainage, and the gear position table 51 in the opening and closing mechanism 5 is used to block the self-pressure relief member 6 during the movement of the self-pressure relief member 6 following the movable end of the inflatable telescopic member 3, so that the self-pressure relief member 6 can be inserted into the inner cavity of the inflatable telescopic member 3, the exhaust section 61 in the self-pressure relief member 6 is communicated with the inner cavity of the inflatable telescopic member 3, thereby realizing the automatic pressure relief of the inflatable telescopic member 3. Without using additional electromagnetic valves, pipelines and circuits, the self-pressure relief function of the inflatable telescopic member 3 can be realized by setting the simple self-pressure relief member 6 and the opening and closing mechanism 5, so that the present application has the advantages of simple structure, reliable operation and cost saving.

[0060] The above describes the embodiment of the present application in combination with the drawings, but the present application is not limited to the above embodiment, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present application.

Claims

1. A pneumatically operated device with needle valve pressure relief, 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. The air vent column is provided with an air vent groove. When the inflatable telescopic component is inflated, the opening and closing mechanism can isolate the venting section and the inner cavity of the inflatable telescopic component from each other; after the inflatable telescopic component 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 component to vent and contract through the gap between the connecting hole and the venting column, as well as the venting groove. The self-releasing pressure member has a sealing protrusion at its upper end and a sealing section located above the exhaust section. The opening and closing mechanism also includes a reset platform 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 seal the connecting hole with the sealing section.

2. The needle valve pressure relief pneumatic device of claim 1, wherein, The venting groove has a connecting end and an outlet end. The connecting end is located at the upper end of the venting groove, and the outlet end is located at the lower end of the venting groove. The connecting end and the outlet end are interconnected through the groove body of the venting groove.

3. The needle valve pressure relief pneumatic device of claim 2, wherein, The length of the venting column and the length of the venting groove are both greater than the vertical thickness of the receiving platform.

4. The needle valve pressure relief pneumatic device of claim 1, wherein, 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.

5. The needle valve pressure relief pneumatic device of claim 1, wherein, The self-relieving pressure component is also provided with a sealing section, which is located above the exhaust section, and the side wall of the sealing section can seal against the wall of the connecting hole.

6. The needle valve pressure relief pneumatic device of claim 5, wherein, The sealing section and the connecting hole are interference fit.

7. A needle valve pressure relief pneumatic device according to claim 5 or 6, characterised in that, The upper end of the self-relieving pressure 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.

8. A gas operated drain valve characterised in that, The pneumatic device for relieving pressure from a needle valve as described in any one of claims 1-7.

9. A water tank characterised in that Includes the pneumatically controlled drain valve as described in claim 8.

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