A pneumatic device for direct-acting pressure relief, a pneumatically controlled drain valve, and a water tank

Abstract

The present invention discloses a pneumatic device with direct-acting pressure relief, a pneumatically controlled drain valve, and a water tank. The pneumatic device with direct-acting pressure relief includes a shell, an air inlet cover, an inflatable telescopic part, a follower, and a self-pressure relief mechanism. The inflatable telescopic part can expand and extend in the shell after inflation. The self-pressure relief mechanism includes an air bleed hole and a touch piece. The air bleed hole is provided on the inflatable telescopic part and is in a normally closed state. The touch piece is fixed to the movable end of the inflatable telescopic part. After the inflatable telescopic part expands and extends to the right position, the touch piece can open the air bleed hole to allow the inflatable telescopic part to deflate and contract. An air-controlled drain valve includes the pneumatic device with direct-acting pressure relief as described above. A water tank includes the pneumatic device with direct-acting pressure relief as described above. The present invention can automatically relieve pressure after inflation is in place, has reliable operation, a very simple structure, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic devices, and in particular to a direct-acting pressure-relieving pneumatic device, a pneumatically controlled drain valve and a water tank. Background Art

[0002] Traditional toilets mostly use a mechanical drain valve to drain the water tank. When drainage is needed, the valve is usually manually pressed to open, allowing water to flow. As people's expectations for quality of life improve, contactless drain valves are gradually being used in smart toilets. Due to the lack of a manual mechanical actuator, contactless drain valves require an additional pneumatic device to trigger the valve's activation.

[0003] The pneumatic devices commonly used on the market today consist of an air pump, an air bag, and a pressure relief valve. When drainage is required, the air pump is started to inflate the air bag. After the air bag is inflated, it expands and stretches, thereby driving the driven rod to trigger the drain valve. However, since the existing pneumatic devices on the market do not have a pressure relief function, after the air pump triggers the drain valve to open through the air bag to drain water, the entire air path is filled with pressurized gas. If the air bag is not deflated and the pressure is not released, the air bag will not be able to shrink, causing the driven rod to always press against the open switch of the drain valve, making it impossible to stop drainage. In order to achieve the pressure relief function of the pneumatic device, the existing pneumatic device usually needs to be equipped with a dedicated pressure relief module and an additional solenoid valve. The air bag is vented through the air path conversion to achieve pressure relief. However, this solution requires additional solenoid valves, pipelines, circuits and other components, which is costly, complex in structure, occupies a large space, and has messy internal wiring. Assembly and maintenance are very troublesome. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a pneumatic device with direct-acting pressure relief, which can automatically relieve pressure after inflation is completed, has reliable operation and a very streamlined structure, can save electrical components, and has low cost.

[0005] In order to solve the above technical problems, the present invention provides a direct-acting pressure-relieving pneumatic device, comprising a shell, an air intake cover, an inflatable telescopic part and a follower. The air intake cover is fixed to the upper part of the shell and is sealed and connected to the inflatable telescopic part. The air intake cover can inflate air into the inflatable telescopic part, and the inflatable telescopic part can expand and extend in the shell after inflation. The follower is connected to the movable end of the inflatable telescopic part, and the follower can reach the bottom of the shell.

[0006] The direct-acting pressure-relieving pneumatic device also includes a self-pressure-relieving mechanism, which includes an air bleed hole and a touch piece. The air bleed hole is provided on the inflatable telescopic member and is in a normally closed state. The touch piece is fixed to the movable end of the inflatable telescopic member. After the inflatable telescopic member is expanded and extended to its full length, the touch piece can open the air bleed hole and cause the inflatable telescopic member to deflate and contract.

[0007] As an improvement of the above solution, an inflatable cavity is provided inside the inflatable telescopic part, and a movable surface is provided at the bottom of the movable end of the inflatable telescopic part. The edge of the movable surface is flexibly connected to the side of the inflatable telescopic part, and the movable surface can be recessed toward the inside of the inflatable cavity.

[0008] The air leakage hole is arranged on the movable surface, and the air leakage hole is communicated with the inflation cavity.

[0009] As an improvement to the above solution, the self-decompression mechanism further includes a stopper fixed to the lower portion of the housing and disposed below the triggering member. The stopper can block the triggering member from moving downward and cause the movable surface to be recessed toward the interior of the inflation chamber.

[0010] As an improvement of the above-mentioned solution, a sealing surface is provided between the follower and the inflatable telescopic member, and the sealing surface is fixed to the top of the follower. The sealing surface can be tightly attached to the movable surface and block the air leakage hole. The movable surface can be separated from the sealing surface when it is recessed toward the interior of the inflation cavity. After separation, the sealing surface can form an air leakage cavity with the movable surface, and the air leakage cavity is connected to the external atmosphere.

[0011] As an improvement of the above solution, the follower also includes a top tube, the top of the top tube is fixedly connected to the sealing surface, a connecting hole is provided in the middle of the sealing surface, the connecting hole is connected to the inner cavity of the top tube, the inner cavity of the top tube is connected to the external atmosphere, and the movable surface can block the connecting hole when it is in close contact with the sealing surface.

[0012] The position of the air leakage hole and the position of the communication hole are staggered.

[0013] As an improvement to the above-mentioned solution, a connecting head and a contact head are respectively provided at both ends of the touch member, the connecting head is sealed with the movable surface, the touch head is provided with a positioning boss, and the positioning boss is provided at one end of the touch head close to the communicating hole. The touch member can move up and down in the communicating hole, and the positioning boss can limit the moving range of the touch head within the top tube.

[0014] As an improvement of the above solution, the air intake cover includes a reset platform, which is located above the trigger and can abut against the connecting head. The reset platform can block the trigger from moving upward and restore the movable surface to a state of close contact with the sealing surface.

[0015] As an improvement to the above solution, the direct-acting pressure relief pneumatic device further includes a return spring, which is arranged between the top of the follower and the bottom of the shell. The return spring can make the follower tend to move toward the return platform.

[0016] As an improvement to the above solution, the shell includes a guide hole, which is provided at the bottom of the shell, and the top tube can be inserted into the guide hole to move up and down.

[0017] The present invention also provides an air-controlled drain valve, comprising the direct-acting pressure-relieving pneumatic device as described above.

[0018] The present invention also provides a water tank comprising the direct-acting pressure-relieving pneumatic device as described above.

[0019] The implementation of the present invention has the following beneficial effects:

[0020] The pneumatic device for direct-acting pressure relief of the present invention comprises an air inlet cover, an inflatable telescopic member, a driven member, and a self-pressure relief mechanism. An external air pump is connected to the air inlet cover and can fill the inflatable telescopic member with gas. During this process, the air relief hole in the self-pressure relief mechanism is in a normally closed state, so that the inflatable telescopic member can expand and extend rapidly without loss, and drive the driven member to open the external drain valve, thereby completing the triggering operation of the drain valve. After the inflatable telescopic member is extended to its full length, the trigger member in the self-pressure relief mechanism opens the air relief hole, causing the inflatable telescopic member to deflate, thereby allowing the drain valve to gradually reset and close for drainage. Therefore, the self-pressure relief mechanism can achieve automatic pressure relief of the inflatable telescopic member, saving additional components such as solenoid valves, and has the advantages of efficient pressure relief and low cost.

[0021] The direct-acting pressure-relieving pneumatic device of the present invention only uses the movable surface at the bottom of the inflatable telescopic part, the air-relieving hole in the movable surface, and the trigger part below the movable surface. By utilizing the elongation and contraction characteristics of the inflatable telescopic part itself, the inflatable telescopic part itself can be automatically deflated. The structure is very simple and there are no complicated components, pipelines, and circuit systems. Therefore, it has the advantages of reliable operation and streamlined structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the disassembled structure of the first embodiment of the direct-acting pressure relief pneumatic device of the present invention;

[0023] Figure 2 1 is a schematic cross-sectional view of a first embodiment of a direct-acting pressure relief pneumatic device according to the present invention;

[0024] Figure 3 yes Figure 2 Partial diagram of A in the middle;

[0025] Figure 4 1 is a schematic cross-sectional view of a first embodiment of a direct-acting pressure relief pneumatic device according to the present invention;

[0026] Figure 5 yes Figure 4 Partial view of B in the middle;

[0027] Figure 6 It is a structural schematic diagram of the inflatable telescopic member of the present invention;

[0028] Figure 7 1 is a schematic diagram of a first state of a first embodiment of a pneumatic device for direct-acting pressure relief according to the present invention;

[0029] Figure 8 1 is a schematic diagram of the second state of the first embodiment of the pneumatic device for direct-acting pressure relief of the present invention;

[0030] Figure 9 1 is a schematic diagram of the third state of the first embodiment of the direct-acting pressure relief pneumatic device of the present invention;

[0031] Figure 10 1 is a schematic diagram of the fourth state of the first embodiment of the pneumatic device for direct-acting pressure relief of the present invention;

[0032] Figure 11 Schematic diagram of a second embodiment of a direct-acting pressure-relieving pneumatic device according to the present invention. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[0034] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 6The first embodiment of the present invention discloses a pneumatic device for direct-acting pressure relief, comprising a housing 1, an air inlet cover 2, an inflatable telescopic member 3, and a follower 4. The air inlet cover 2 is fixed to the upper portion of the housing 1 and is sealed and connected to the inflatable telescopic member 3. The air inlet cover 2 is connected to an external air pump, which can inflate the inflatable telescopic member 3 through the air inlet cover 2. After inflation, the inflatable telescopic member 3 can expand and extend within the housing 1. The follower 4 is connected to the movable end of the inflatable telescopic member 3, so that the inflatable telescopic member 3 will drive the follower 4 to move when it expands and extends. After the inflatable telescopic member 3 expands and extends to its full length, the follower 4 can reach the bottom of the housing 1. As the follower 4 reaches the bottom of the housing 1, it can push an external drain valve to gradually open and perform a drain operation. The inflatable telescopic part 3 is an object that can produce elastic deformation after being filled with gas, such as a telescopic folding airbag, a telescopic balloon, a telescopic air film, etc. In this embodiment, the inflatable telescopic part 3 is preferably a telescopic folding airbag, which has a relatively stable elongation motion path and is suitable for use in a stable motion system.

[0035] In order to realize the automatic pressure relief function, the pneumatic device of direct pressure relief also includes a self-pressure relief mechanism 5, which includes an air bleed hole 51 and a trigger 52. The air bleed hole 51 is provided on the inflatable telescopic member 3 and is in a normally closed state. When the inflatable telescopic member 3 is inflated, the air bleed hole 51 is in a sealed state, and the inflatable telescopic member 3 can expand and extend without leakage and loss. During the expansion and extension of the inflatable telescopic member 3, the follower 4 can trigger the external drain valve to drain water. The trigger 52 is fixed to the movable end of the inflatable telescopic member 3. After the inflatable telescopic member 3 is expanded and extended to the right position, the trigger 52 can open the air bleed hole 51 to make the inflatable telescopic member 3 deflate and contract. After the pressure is relieved and contracted, the inflatable telescopic member 3 gradually shortens and drives the follower 4 to move upward. At this time, the external drain valve switch will gradually close and eventually close, thereby achieving the effect of pressure relief and water shut-off.

[0036] Therefore, the beneficial effects of the first embodiment of the present invention are as follows:

[0037] The pneumatic device for direct-acting pressure relief in the first embodiment of the present invention is provided with an air intake cover 2, an inflatable telescopic part 3, a follower 4 and a self-pressure relief mechanism 5. The air intake cover 2 is connected to an external air pump, and gas can be filled into the inflatable telescopic part 3 through the external air pump. As the internal air pressure increases, the inflatable telescopic part 3 will expand and stretch. During this process, the air relief hole 51 in the self-pressure relief mechanism 5 is in a normally closed state, so that the inflatable telescopic part 3 can expand and stretch rapidly without loss. During this process, the force of the gas on the bottom of the inflatable telescopic part 3 is greater than the switching resistance of the external drain valve, so that the inflatable telescopic part 3 can drive the follower 4 to open the external drain valve, thereby completing the triggering operation of the drain valve. After the inflatable telescopic member 3 is extended to its full position, the trigger 52 in the self-pressure relief mechanism 5 will open the air release hole 51, causing the inflatable telescopic member 3 to be deflated. As the internal air pressure decreases, the force of the air pressure on the bottom of the inflatable telescopic member 3 gradually decreases and is less than the switch restoring force of the external drain valve or the elastic contraction force of the inflatable telescopic member 3 itself, so that the drain valve can gradually reset and close the drainage. Therefore, the self-pressure relief mechanism 5 can be used to achieve automatic pressure relief of the inflatable telescopic member 3, saving additional components such as solenoid valves, and having the advantages of high pressure relief efficiency and low cost.

[0038] Specifically, the inflatable telescopic member 3 is provided with an inflatable cavity 31, and the gas filled by the air inlet cover 2 will gather in the inflatable cavity 31. The bottom of the movable end of the inflatable telescopic member 3 is provided with a movable surface 32. The edge of the movable surface 32 is flexibly connected to the side of the inflatable telescopic member 3, so that the movable surface 32 can be attached to the side of the inflatable telescopic member 3 and folded up and down. When the movable surface 32 is folded upward, the movable surface 32 can be recessed toward the interior of the inflatable cavity 31, thereby causing the movable surface 32 to move upward from its original position. The air vent 51 is provided on the movable surface 32. The air vent 51 can move up and down with the movable surface 32. The air vent 51 is connected to the inflatable cavity 31. When the air vent 51 is opened, the gas in the inflatable cavity 31 will be discharged from the air vent 51.

[0039] See also Figure 4 and Figure 5The self-depressurization mechanism 5 also includes a shift platform 53, which is fixed to the lower part of the shell 1 and is arranged below the trigger 52. The shift platform 53 can block the trigger 52 from moving downward and make the movable surface 32 concave toward the inside of the inflation chamber 31. Therefore, when the inflatable telescopic member 3 is expanded and extended, the touch member 52 will move downward following the movable end of the inflatable telescopic member 3. After moving to a certain position, the touch member 52 will abut against the shift platform 53. Due to the shifting effect of the shift platform 53, the touch member 52 will no longer move downward. However, since the inflatable telescopic member 3 still has expansion space in the shell 1, the inflatable telescopic member 3 will continue to push the movable surface 32 to move downward. At this time, since the touch member 52 is connected to the movable surface 32, when the touch member 52 is stationary, the movable surface 32 will be pushed upward by the reaction force of the touch member 52, thereby causing the movable surface 32 to be recessed upward toward the interior of the inflatable cavity 31.

[0040] In order to maintain the normally closed state of the air leakage hole 51, a sealing surface 41 is provided between the follower 4 and the inflatable telescopic member 3. The sealing surface 41 is fixed to the top of the follower 4. The sealing surface 41 can be in close contact with the movable surface 32 and block the air leakage hole 51. During the expansion and contraction of the inflatable telescopic member 3, the sealing surface 41 is always in close contact with the movable surface 32, so that the air leakage hole 51 can be blocked to achieve normal closure. When the trigger 52 reaches the shift platform 53, under the action of the shift platform 53, the movable surface 32 will be driven by the trigger 52 in the reverse direction to be recessed upward toward the inside of the inflatable cavity 31. At this time, the movable surface 32 is recessed toward the When the interior of the inflation chamber 31 is recessed, it can be separated from the sealing surface 41, and the air leakage hole 51 will follow the movable surface 32 to leave the sealing surface 41. At this point, the sealed state of the air leakage hole 51 is broken. After separation, the sealing surface 41 can form an air leakage chamber 54 with the upwardly recessed movable surface 32. On the one hand, the air leakage chamber 54 is connected with the inflation chamber 31 through the air leakage hole 51. On the other hand, the air leakage chamber 54 is connected with the external atmosphere. Therefore, the gas in the inflation chamber 31 will enter the air leakage chamber 54 through the air leakage hole 51 and finally be discharged to the external atmosphere, so that the trigger 52 can open the air leakage hole 51 and cause the inflatable telescopic member 3 to deflate and contract.

[0041] In order to drive the external drain valve, the follower 4 also includes a top tube 42, the top of which is fixedly connected to the sealing surface 41 and extends downward from the housing 1. When the inflatable telescopic member 3 is inflated and extended, the inflatable telescopic member 3 pushes the top tube 42 downward, and the bottom of the top tube 42 touches the switch of the external drain valve, causing the drain valve to open. In order to allow the gas in the inflatable telescopic member 3 to be discharged to the outside atmosphere, a connecting hole 43 is provided in the middle of the sealing surface 41. The connecting hole 43 is connected to the inner cavity of the top tube 42, and the inner cavity of the top tube 42 is connected to the outside atmosphere. In this way, when the inflatable telescopic member 3 is deflated through the vent hole 51, the gas entering the deflation chamber 54 from the inflation chamber 31 will enter the inner cavity of the top tube 42 through the connecting hole 43 and then be discharged from the inner cavity of the top tube 42 to the outside atmosphere, thereby achieving the function of deflation and pressure relief. To ensure lossless inflation of the inflatable expandable member 3, the movable surface 32 blocks the communicating hole 43 when in close contact with the sealing surface 41. This allows the inflatable expandable member 3 to release air only when the movable surface 32 is recessed into the inflation chamber 31 to form the deflation chamber 54. At other times, both the deflation hole 51 and the communicating hole 43 are blocked by the movable surface 32, achieving a seal that allows the inflatable expandable member 3 to expand and extend normally and without loss. Furthermore, the deflation hole 51 and the communicating hole 43 are offset from each other, allowing the sealing surface 41 to seal the deflation hole 51 and the movable surface 32 to seal the communicating hole 43, preventing air from leaking.

[0042] Furthermore, the touch member 52 can pass through the connecting hole 43, and the touch member 52 can move up and down in the connecting hole 43. The two ends of the touch member 52 are respectively provided with a connecting head 521 and a touch head 522. The connecting head 521 is sealed with the movable surface 32. The movable surface 32 drives the touch member 52 to move through the connecting head 521. The touch head 522 is provided with a locking boss 523. The locking boss 523 is provided at one end of the touch head 522 close to the connecting hole 43. The cross-section of the locking boss 523 is larger than the communicating hole 43. Therefore, when the movable surface 32 is recessed toward the inside of the inflation chamber 31 to drive the touch member 52 to move upward, the locking boss 523 will press against the edge of the communicating hole 43, so that the touch head 522 will not go beyond the communicating hole 43. Therefore, the locking boss 523 can limit the movement range of the touch head 522 within the top tube 42, and can prevent the touch head 522 from jumping out above the communicating hole 43, causing it to lose its fixation and affecting subsequent actions.

[0043] After the inflatable telescopic member 3 is deflated and contracted, the movable surface 32 will always maintain a concave state due to the absence of external force. In order to restore the movable surface 32, the air inlet cover 2 is further provided with a reset platform 21. The reset platform 21 is located above the trigger 52 and can abut against the connector 521. The reset platform 21 is preferably a long column and is vertically arranged. When the inflatable telescopic member 3 is contracted, the movable surface 32 and the connector 521 move upward. When moving to the recovery position, the connector 5 21 will abut against the return platform 21. As the inflatable telescopic member 3 continues to contract, the return platform 21 can block the upward movement of the trigger 52. At this time, due to the reaction force of the return platform 21 on the trigger 52, the movable surface 32 will fold downward to restore its original state, the degassing cavity 54 disappears, and the connecting head 521 will also return to the sealing surface 41 along with the movable surface 32. Therefore, the return platform 21 can restore the movable surface 32 to a state of close contact with the sealing surface 41. After recovery, the sealing surface 41 will once again block the degassing hole 51, and the movable surface 32 will once again block the connecting hole 43.

[0044] In order to limit the movement direction of the follower 4, the shell 1 also includes a guide hole 11, which is provided at the bottom of the shell 1. The top tube 42 can be inserted into the guide hole 11 and move up and down, thereby ensuring that the inflatable telescopic member 3 and the follower 4 can be aligned with the switch of the external drain valve, and also ensuring that the movable surface 32 can be properly stressed to achieve normal folding, depression and recovery.

[0045] The working principle and working process of the first embodiment of the present invention are as follows:

[0046] See also Figure 7 In a normal state, the connector 521 is against the reset platform 21, the movable surface 32 is in close contact with the sealing surface 41, and the air vent 51 and the communicating hole 43 are in a closed state; see Figure 8 When drainage is required, the external air pump is started and the inflatable telescopic member 3 is inflated through the air inlet cover 2. The inflatable telescopic member 3 begins to expand and extend under the action of the increased air pressure. Under the limiting action of the guide hole 11, the inflatable telescopic member 3 pushes the follower 4 to move downward. Then the bottom of the top tube 42 touches the switch of the external drain valve. The air pressure force on the inflatable telescopic member 3 is greater than the switch triggering force of the external drain valve. At this time, the switch opens to start drainage. During this process, the air vent 51 is always in a closed state. Figure 9, then the inflatable telescopic member 3 continues to extend, and then the touch head 522 will abut against the shift platform 53. As the inflatable telescopic member 3 continues to extend, the shift platform 53 will provide a reaction force to the touch head 522. The reaction force acts on the movable surface 32, causing the movable surface 32 to be recessed toward the inside of the inflatable cavity 31. The movable surface 32 is separated from the sealing surface 41 to form the degassing cavity 54. The degassing hole 51 and the communicating hole 43 are opened at the same time. The gas in the inflatable cavity 31 enters the degassing cavity 54 through the degassing hole 51 and is discharged from the communicating cavity to the external atmosphere. At this time, the drainage action is completed; see Figure 10 , after which the restoring force of the external drain valve switch is greater than the air pressure force in the inflatable chamber 31, the inflatable telescopic member 3 begins to deflate and shrink, the external drain valve switch gradually closes, the top tube 42 pushes the inflatable telescopic member 3 to move upward, and makes the connecting head 521 rest against the reset platform 21, the top tube 42 continues to push the inflatable telescopic member 3, so that the reset platform 21 generates a reaction force on the touch head 522, the reaction force prompts the movable surface 32 to fold downward and restore to its original state, the movable surface 32 is in close contact with the sealing surface 41, the deflating chamber 54 disappears, the deflating hole 51 and the connecting hole 43 are closed, and they are restored to their initial state.

[0047] The direct-acting pressure-relieving pneumatic device of the present invention only uses the movable surface 32 at the bottom of the inflatable telescopic member 3, the air-relieving hole 51 in the movable surface 32, and the trigger 52 below the movable surface 32, and can automatically deflate the inflatable telescopic member 3 itself. The structure is very simple and there are no complicated components and piping systems. Therefore, it has the advantages of reliable operation and streamlined structure.

[0048] See also Figure 11 The present invention also discloses a second embodiment. In the second embodiment, the direct-acting pressure-relieving pneumatic device further includes a reset spring 6, which is arranged between the top of the follower 4 and the bottom of the shell 1. The reset spring 6 can make the follower 4 have a tendency to move toward the reset platform 21. When the inflatable telescopic member 3 is deflated and contracted, the reset spring 6 can cooperate with the restoring force of the external drain valve switch to reset the inflatable telescopic member 3 and the movable surface 32, thereby having a faster recovery speed and higher efficiency.

[0049] The embodiment of the present invention further discloses a pneumatically controlled drain valve and a water tank (not shown in the figure), wherein the pneumatically controlled drain valve and the water tank both include a pneumatic device for direct-acting pressure relief as described above. In this embodiment, the pneumatic device for direct-acting pressure relief is provided with an inflatable telescopic member 3, a follower 4, a trigger 52, a movable surface 32, and an air vent 51. When the air vent water tank needs to drain, the movable surface 32 closes the air vent 51. The air pump in the air vent water tank inflates the inflatable telescopic member 3, causing the inflatable telescopic member 3 to expand and elongate, thereby driving the follower 4 to move downward. Finally, the follower 4 opens the drain valve switch under the action of air pressure, allowing drainage to proceed. When the inflatable telescopic member 3 continues to descend, the trigger 52 moves upward, causing the movable surface 32 to sag upward, thereby opening the air vent 51, causing the inflatable telescopic member 3 to automatically deflate. At this time, the inflatable telescopic member 3 slowly contracts, and the drain valve switch gradually closes. Therefore, the pneumatic device of the air-controlled water tank in the embodiment of the present invention can realize the automatic pressure relief function and operate reliably. Moreover, it can achieve a reliable self-pressure relief effect by only using the original components such as the inflatable telescopic member 3, the follower 4, and the trigger 52, as well as the additional movable surface 32 and the air relief hole 51. Therefore, it has the advantages of a simple structure and low cost.

[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A pneumatic device with direct-acting pressure relief, characterized in that: The air intake cover comprises a housing, an air intake cap, an inflatable telescopic member, and a follower, wherein the air intake cap is fixed to the upper portion of the housing and is in sealed communication with the inflatable telescopic member. The air intake cap is in communication with an external air pump and is capable of inflating the inflatable telescopic member. After inflation, the inflatable telescopic member is capable of expanding and extending within the housing. The follower is connected to the movable end of the inflatable telescopic member and is capable of reaching the bottom of the housing. The direct-acting pressure-relieving pneumatic device further includes a self-pressure-relieving mechanism, which includes an air-relieving hole and a trigger, wherein the air-relieving hole is provided on the inflatable telescopic member and is in a normally closed state, and the trigger is fixed to the movable end of the inflatable telescopic member. After the inflatable telescopic member is expanded and extended to its full length, the trigger can open the air-relieving hole and cause the inflatable telescopic member to deflate and contract; An inflatable cavity is provided inside the inflatable telescopic member, and a movable surface is provided at the bottom of the movable end of the inflatable telescopic member. The edge of the movable surface is flexibly connected to the side of the inflatable telescopic member, and the movable surface can be recessed toward the interior of the inflatable cavity; The air leakage hole is arranged on the movable surface, and the air leakage hole is communicated with the inflation cavity.

2. The direct-acting pressure relief pneumatic device according to claim 1, characterized in that: The self-depressurization mechanism further includes a shifting platform fixed to the lower portion of the housing and disposed below the triggering member. The shifting platform can stop the triggering member from moving downward and cause the movable surface to be recessed toward the interior of the inflation cavity.

3. The direct-acting pressure relief pneumatic device according to claim 1, characterized in that: A sealing surface is provided between the follower and the inflatable telescopic member, and the sealing surface is fixed to the top of the follower. The sealing surface can be in close contact with the movable surface and block the air leakage hole. The movable surface can be separated from the sealing surface when it is recessed toward the interior of the inflatable cavity. After separation, the sealing surface can enclose an air leakage cavity with the movable surface, and the air leakage cavity is connected to the external atmosphere.

4. The direct-acting pressure relief pneumatic device according to claim 3, characterized in that: The driven member further includes a top tube, the top of which is fixedly connected to the sealing surface, a communication hole is provided in the middle of the sealing surface, the communication hole is communicated with the inner cavity of the top tube, and the inner cavity of the top tube is communicated with the external atmosphere, and the movable surface is capable of blocking the communication hole when in close contact with the sealing surface; The position of the air leakage hole and the position of the communication hole are staggered.

5. The direct-acting pressure relief pneumatic device according to claim 4, characterized in that: The two ends of the touch piece are respectively provided with a connecting head and a touch head, the connecting head is sealed with the movable surface, the touch head is provided with a locking boss, and the locking boss is provided at one end of the touch head close to the communicating hole. The touch piece can move up and down in the communicating hole, and the locking boss can limit the moving range of the touch head within the top tube.

6. The direct-acting pressure relief pneumatic device according to claim 5, characterized in that: The air inlet cover includes a reset platform, which is located above the trigger and can abut against the connector. The reset platform can block the trigger from moving upward and restore the movable surface to a state of being in close contact with the sealing surface.

7. The direct-acting pressure relief pneumatic device according to claim 6, characterized in that: The direct-acting pressure-relieving pneumatic device further comprises a return spring, which is arranged between the top of the follower and the bottom of the housing. The return spring can cause the follower to have a tendency to move toward the return platform.

8. The direct-acting pressure relief pneumatic device according to claim 4, characterized in that: The shell includes a guide hole, which is provided at the bottom of the shell. The top tube can be inserted into the guide hole and move up and down.

9. An air-controlled drain valve, characterized in that: A pneumatic device comprising a direct-acting pressure relief device as described in any one of claims 1 to 8.

10. A water tank, characterized in that: A pneumatic device comprising a direct-acting pressure relief device as described in any one of claims 1 to 8.

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