Check valve

Abstract

The utility model provides a check valve which comprises a valve body and a check assembly arranged in the valve body, the check valve further comprises an exhaust assembly, the exhaust assembly is arranged on the valve body and located between a water inlet of the valve body and the check assembly, and the check assembly is arranged on the valve body. The exhaust assembly and a liquid level sensor in the water tank are electrically connected with the control panel. The exhaust assembly is arranged, and the exhaust assembly and the liquid level sensor are electrically connected with the control panel, so that when the liquid level sensor detects that the water level in the water tank is lower than a preset value, namely, the water tank is in an emptying state, a signal is transmitted to the control panel, and the control panel is communicated with the exhaust assembly according to the signal; air in the external environment of the valve body can enter the valve body, water in a pipeline between the check valve and the centrifugal pump can flow back into the centrifugal pump under the action of atmospheric pressure through introduction of the air, the air in the centrifugal pump is extruded out, and therefore the problem of air trapping of the centrifugal pump is solved.

Description

Technical Field

[0001] The utility model particularly relates to a check valve. Background Art

[0002] Check valves are widely used in aquatic products, such as water heaters, water purifiers, etc. Especially for some products with complex waterways and many branches, when it is necessary to prevent the water flow from reversing, check valves are used to achieve this.

[0003] However, in some cases, while the check valve prevents the reverse flow of water, it also brings a problem: the problem of air trapped in the centrifugal pump in front of the check valve. Specifically, a check valve is set behind the centrifugal pump. When the centrifugal pump is used to pump water from the water tank, when the centrifugal pump empties the water in the water tank, the air in the water tank enters the centrifugal pump. When the centrifugal pump continues to work, there is water in the pipelines before and after the check valve away from the water tank. The gravity generated by the water behind the check valve will hold the check valve up, making it impossible for the water in front of the check valve to flow. Due to insufficient pressure, the air in the centrifugal pump cannot continue to flow the water in front of the check valve toward the check valve, and the air in the centrifugal pump cannot be discharged, that is, the problem of air trapped in water occurs. For the above problems, currently, an exhaust pipeline is set up, or program control is used to ensure that air does not enter the centrifugal pump to achieve this.

[0004] Of the above two solutions, the first one requires manual operation by the user, which is very inconvenient. The second one requires ensuring that air cannot enter the centrifugal pump, which is generally achieved by setting the program not to empty the water in the water tank. When the water in the water tank is not clean and needs to be emptied and replaced, in fact, a lot of unclean water still remains after the emptying operation is completed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a check valve in order to overcome the defect in the prior art that the centrifugal pump is trapped with air when the centrifugal pump empties the water tank.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] A check valve comprises a valve body and a check assembly arranged in the valve body, the check valve also comprises: an exhaust assembly, the exhaust assembly is arranged on the valve body, and the exhaust assembly is located between the water inlet of the valve body and the check assembly, the exhaust assembly and the liquid level sensor in the water tank are both electrically connected to a control board.

[0008] In the present solution, an exhaust component is provided, and the exhaust component and the liquid level sensor are electrically connected to the control board respectively, so that when the liquid level sensor detects that the water level in the water tank is lower than a preset value, that is, the water tank is in an empty state, a signal is transmitted to the control board, and the control board connects the exhaust component according to the signal to allow air from the external environment of the valve body to enter the valve body. The introduction of air can cause the water in the pipeline between the check valve and the centrifugal pump to flow back to the centrifugal pump under atmospheric pressure, and squeeze out the air in the centrifugal pump, thereby solving the problem of air trapping in the centrifugal pump.

[0009] Preferably, the valve body is provided with an air port for accommodating the exhaust component, the air port is communicated with an inner flow channel of the valve body, and the exhaust component is detachably connected to the air port.

[0010] In this solution, the exhaust assembly is detachably connected to the air port to improve the convenience of maintenance of the exhaust assembly.

[0011] Preferably, the exhaust component includes a driving part, a first seal and a second seal, the second seal is arranged in the air port, the first seal is connected to the driving part, and the driving part is used to drive the first seal to reciprocate along the axial direction of the air port, when the first seal abuts against the second seal, the air port is closed, and when the first seal is away from the second seal, the air port is opened.

[0012] In the present solution, a driving part is provided to drive the movement of the first seal so as to achieve closure of the air port when the first seal and the second seal abut against each other, thereby ensuring the sealing of the check valve under normal working conditions; and when the first seal and the second seal move away from each other, outside air is introduced into the air port to solve the problem of air trapping in the centrifugal pump.

[0013] Preferably, an exhaust hole is provided in the air port, an air inlet hole is opened on the valve body, the second sealing member is provided between the exhaust hole and the air inlet hole and is positioned by a positioning boss, a connecting hole is provided at the axis of the second sealing member, the connecting hole is used to connect the air inlet hole and the exhaust hole, and when the air port is closed, the first sealing member is used to abut against the connecting hole.

[0014] In this solution, the exhaust hole is used to communicate with the outside air, the air inlet hole is used to communicate with the flow channel of the valve body, and the second seal is used to isolate the outside air. When the connecting hole set on the second seal is abutted by the first seal, the air port is closed. On the contrary, the first seal is away from the connecting hole to open the air port and introduce outside air.

[0015] Preferably, the driving part comprises a spring, a core and an electromagnet coil, wherein the core is located at the axis of the electromagnet coil, and the core is disposed between the spring and the first sealing member.

[0016] In this solution, through the above arrangement, the first sealing member can move automatically when performing reciprocating motion without manual operation, thereby improving the automation level of the check valve.

[0017] Preferably, the driving part also includes a limiting member, one end of which abuts against the second sealing member and is positioned in the air port through a pressure plate, and the limiting member is provided with a guide groove along the axis of the second sealing member, and the spring, the core body and the first sealing member are sequentially arranged in the guide groove.

[0018] In this solution, the above arrangement is used to improve the stability of the second sealing member, as well as the stability and reliability of the first sealing member during movement.

[0019] Preferably, the exhaust assembly includes a drive motor and an output shaft, the drive motor is disposed in the air port, the output shaft is connected to the drive motor, and the output shaft reciprocates along the axial direction of the air port.

[0020] In this solution, through the above arrangement, the opening or closing of the air port is achieved through the output shaft.

[0021] Preferably, an exhaust hole is provided in the air port, an air inlet hole is provided on the valve body, the exhaust hole is communicated with the air inlet hole, and when the air port is closed, the output shaft extends into the air inlet hole and closes the air inlet hole.

[0022] In this solution, the output shaft is extended into the air inlet to prevent outside air from entering the valve body, so as to ensure the air tightness of the valve body. On the contrary, when the output shaft extends out of the air inlet, outside air can be smoothly introduced into the valve body to achieve automatic air intake.

[0023] Preferably, the exhaust assembly further comprises a sealing ring, and the sealing ring is sleeved on the outer peripheral side of the end portion of the output shaft extending into the air inlet hole.

[0024] In this solution, a sealing ring is provided to improve the air tightness of the end of the output shaft extending into the air inlet hole.

[0025] Preferably, the air port further includes a connecting piece, the connecting piece cover is disposed on the driving motor, and the connecting piece is connected to the air port via a bolt assembly.

[0026] In this solution, a connecting piece is provided to position the driving motor in the air port.

[0027] The positive progressive effect of the utility model is that the utility model sets an exhaust component, and electrically connects the exhaust component and the liquid level sensor to the control board respectively, so that when the liquid level sensor detects that the water level in the water tank is lower than the preset value, that is, the water tank is in an empty state, the signal is transmitted to the control board, and the control board connects the exhaust component according to the signal to allow the air from the external environment of the valve body to enter the valve body. The introduction of air can make the water in the pipeline between the check valve and the centrifugal pump flow back to the centrifugal pump under the atmospheric pressure, and squeeze the air in the centrifugal pump out, thereby solving the problem of air trapped in the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the check valve of Example 1 of the utility model.

[0029] Figure 2 This is a positional relationship diagram of the exhaust hole and the valve body of Example 1 of the utility model.

[0030] Figure 3 This is a diagram showing the positional relationship between the exhaust assembly and the air port of Example 1 of the utility model.

[0031] Figure 4 This is a working principle diagram of the check valve in Example 1 of the utility model.

[0032] Figure 5 It is a front view of the check valve of Example 2 of the utility model.

[0033] Figure 6 This is a positional relationship diagram of the drive motor and the output shaft of Example 2 of the utility model.

[0034] Description of reference numerals:

[0035] Valve body 1

[0036] Water Inlet 11

[0037] Water outlet 12

[0038] Air port 13

[0039] Exhaust hole 131

[0040] Positioning boss 132

[0041] Air Inlet 14

[0042] Check component 2

[0043] Exhaust assembly 3

[0044] Driving unit 31

[0045] Spring 311

[0046] Core 312

[0047] Electromagnet coil 313

[0048] Limiting piece 314

[0049] Guide groove 3141

[0050] First seal 32

[0051] Second sealing member 33

[0052] Communication hole 331

[0053] Drive motor 34

[0054] Output shaft 35

[0055] Sealing ring 36

[0056] Connector 4

[0057] Check valve 100

[0058] Faucet 200

[0059] Centrifugal Pump 300

[0060] Water tank 400

[0061] Liquid level sensor 500

[0062] Flow Meter 600 DETAILED DESCRIPTION

[0063] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0064] Example 1

[0065] This embodiment provides a check valve 100, the specific structure of which is as follows Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the check valve 100 includes a valve body 1 and a check assembly 2 disposed in the valve body 1, the valve body 1 includes a water inlet 11 and a water outlet 12, wherein the check assembly 2 is disposed close to the water outlet 12. Figure 4In the figure, the check valve 100 is arranged in the water channel structure and is close to the water nozzle 200, the centrifugal pump 300 is arranged close to the water tank 400, and a liquid level sensor 500 is arranged in the water tank 400. Specifically, when the centrifugal pump 300 is pumping water, water flows from the water tank 400 in sequence through the centrifugal pump 300, the check valve 100 and the water nozzle 200 and finally flows out of the water channel structure. The air trapped in the centrifugal pump 300 occurs when the water level in the water tank 200 is low, and the centrifugal pump 300 is filled with air from the water tank 400, causing water to accumulate in the pipeline between the centrifugal pump 300 and the check valve 100, and the centrifugal pump 300 cannot exhaust itself when it is in a continuous working state, resulting in air being trapped in the centrifugal pump 300, so that the centrifugal pump 300 cannot provide sufficient pressure to pump the water to the pipeline between the check valve 100 and the water nozzle 200. This is the prior art and will not be elaborated on here. In other embodiments, a flow meter 600 may be further provided between the centrifugal pump 300 and the check valve 100 to improve the accuracy of detecting whether the water tank 400 is in an empty state.

[0066] In this regard, Figure 3 As shown, the check valve 100 also includes: an exhaust component 3, which is arranged on the valve body 1, and the exhaust component 3 is located between the water inlet 11 of the valve body 1 and the check component 2, and the exhaust component 3 and the liquid level sensor 500 in the water tank 400 are electrically connected to the control board (not shown in the figure).

[0067] Specifically, one end of the valve body 1 close to the water tank 400 is the water inlet 11, and the other end of the valve body 1 away from the water tank 400 is the water outlet 12. The check assembly 2 is a one-way flow structure in the prior art that pushes the valve core through an elastic assembly, which will not be described in detail here. The exhaust assembly 3 is arranged close to the water inlet 11, and the exhaust assembly 3 can connect the inside of the valve body 1 with the external environment, so as to introduce the air in the external environment into the inside of the valve body 1 in the connected state. It can be understood that when the air in the external environment is introduced into the inside of the valve body 1, the air enters the valve body through the atmospheric pressure to press the water flow between the centrifugal pump 300 and the check valve 100 into the centrifugal pump 300, and the air originally sucked from the water tank 400 is squeezed out of the centrifugal pump 300 by the water flow, so that the centrifugal pump 300 obtains sufficient pressure and pumps the water flow into the pipeline between the check valve 100 and the faucet 200, completes the exhaust of the centrifugal pump 300, and solves the problem of trapped air in the centrifugal pump 300.

[0068] On this basis, by setting the exhaust component 3, and electrically connecting the exhaust component 3 and the liquid level sensor 500 to the control board respectively, the liquid level sensor 500 transmits a signal to the control board when it detects that the water level in the water tank 400 is lower than the preset value, that is, the water tank 400 is in an empty state, and the control board connects the exhaust component 3 according to the signal, so that the air in the external environment of the valve body 1 can enter the valve body 1. The introduction of air can make the water in the pipeline between the check valve 100 and the centrifugal pump 300 flow back to the centrifugal pump 300 under the atmospheric pressure, and squeeze out the air in the centrifugal pump 300, so as to solve the problem of air trapped in the centrifugal pump 300. It should be noted that the signal transmission and reception of the liquid level sensor 500, the control board and the exhaust component 3 in this embodiment all adopt the signal transmission and reception mode in the prior art. This embodiment does not improve its signal logic, and it will not be elaborated on here.

[0069] Furthermore, in this embodiment, a gas port 13 for accommodating the exhaust component 3 is provided on the valve body 1 , the gas port 13 is communicated with the flow channel in the valve body 1 , and the exhaust component 3 is detachably connected to the gas port 13 .

[0070] Specifically, the valve body 1 is a cylindrical structure, the air port 13 is a cylindrical structure and is arranged in the radial direction of the valve body 1, the air port 13 is connected to the flow channel in the valve body 1, the exhaust component 3 is also a cylindrical structure in appearance, and one end of the exhaust component 3 is inserted into the air port 13, the outer peripheral side of the exhaust component 3 is provided with a through hole, and the end of the air port 13 is provided with a threaded hole corresponding to the through hole, so that the exhaust component 3 is connected to the air port 13 through a bolt assembly. Of course, in other embodiments, a snap-on structure can be provided, such as a way in which a slot and a protrusion cooperate with each other, so that the exhaust component 3 can be detachably connected to the air port 13. This is a prior art and will not be described in detail here. By detachably connecting the exhaust component 3 to the air port 13, maintenance personnel can disassemble the exhaust component 3 in time for replacement and repair, thereby improving the convenience of maintenance of the exhaust component 3.

[0071] In this embodiment, the exhaust component 3 includes a driving part 31, a first seal 32 and a second seal 33. The second seal 33 is arranged in the air port 13, and the first seal 32 is connected to the driving part 31. The driving part 31 is used to drive the first seal 32 to reciprocate along the axial direction of the air port 13. When the first seal 32 abuts against the second seal 33, the air port 13 is closed, and when the first seal 32 is away from the second seal 33, the air port 13 is opened.

[0072] Specifically, the second seal 33 is a disc structure and has the same shape as the air port 13, the first seal 32 is a cylindrical structure, and a guide surface is provided at the end of the first seal 32 facing the second seal 33, the drive part 31 is arranged away from the second seal 33, and the drive part 31 is used to drive the first seal 32 to move along the axial direction of the air port 13 to approach or move away from the second seal 33. It can be understood that in this embodiment, the first seal 32 and the second seal 33 are both made of rubber material to ensure air tightness. By setting the drive part 31 to drive the first seal 32 to move, the air port 13 is closed when the first seal 32 and the second seal 33 abut against each other, and the sealing of the check valve 100 under normal working conditions is ensured; and when the first seal 32 and the second seal 33 are away from each other, the outside air is introduced into the air port 13 to solve the problem of trapped air in the centrifugal pump.

[0073] In this embodiment, an exhaust hole 131 is provided in the air port 13, an air inlet hole 14 is opened on the valve body 1, the second sealing member 33 is provided between the exhaust hole 131 and the air inlet hole 14 and is positioned by a positioning boss 132, and a connecting hole 331 is provided at the axis of the second sealing member 33, the connecting hole 331 is used to connect the air inlet hole 14 and the exhaust hole 131, and when the air port 13 is closed, the first sealing member 32 is used to abut the connecting hole 331.

[0074] Specifically, the exhaust hole 131 is arranged along the radial direction of the air port 13 and penetrates to the outer surface of the air port 13, and the air inlet 14 extends in the same direction as the air port 13 and is used to connect to the flow channel in the valve body 1. Figure 3 As shown, a cylindrical partition is provided at the axis of the air port 13, and the second sealing member 33 is provided at the top of the partition to isolate the air inlet 14 from the air outlet 131, and a connecting hole 331 is provided at the axis of the second sealing member 33, and the connecting hole 331 is connected to the through hole provided at the edge of the second sealing member 33, and further connected to the air inlet 14, so that when the connecting hole 331 is opened by the first sealing member 32, the outside air enters the valve body 1 from the air outlet 131, the connecting hole 331, the through hole and the air inlet 14. It can be understood that in other embodiments, the size of the second sealing member 33 can be consistent with the size of the partition, that is, the edge of the second sealing member 33 is located at the top of the partition, and in this case, the above function can be achieved without providing a through hole, which is a prior art and will not be described in detail here.

[0075] In another embodiment, multiple air inlet holes 14 can be provided and connected through arc grooves to improve the air intake efficiency of the exhaust hole 131 and reduce the response time of introducing air into the valve body 1. This is the prior art and will not be elaborated on here.

[0076] In this embodiment, the driving part 31 includes a spring 311 , a core 312 and an electromagnet coil 313 . The core 312 is located at the axis of the electromagnet coil 313 , and the core 312 is disposed between the spring 311 and the first sealing member 32 .

[0077] Specifically, one end of the core 312 is connected to the first seal 32, the core 312 is an iron core, and a snap-fit ​​structure is provided at the end of the core 312. The end of the first seal 32 used for connecting with the core 312 is provided with a snap-fit ​​groove matched with the snap-fit ​​structure, so that the first seal 32 and the core 312 are connected to form a whole, and the spring 311 is arranged away from the first seal 32 to provide a reset function for the first seal 32. When the exhaust assembly 3 is turned on, the electromagnet coil 313 is turned on and adsorbs the core 312 away from the second seal 33, so that the connecting hole 331 on the second seal 33 is opened, and the outside air enters the air inlet 14 through the connecting hole 331. The spring 311 is compressed, and when the electromagnet coil 313 is powered off, it pushes the core 312 to move, so that the first seal 32 abuts against the second seal 33, and the connecting hole 331 is closed, so as to ensure the air tightness of the check valve 100. Through the above arrangement, the first sealing member 32 can automatically move when performing reciprocating motion without manual operation, thereby improving the automation level of the check valve 100.

[0078] In this embodiment, the driving part 31 also includes a limiting member 314, one end of which abuts against the second sealing member 33 and is positioned in the air port 13 through a pressure plate. The limiting member 314 is provided with a guide groove 3141 along the axis of the second sealing member 33, and the spring 311, the core body 312 and the first sealing member 32 are sequentially arranged in the guide groove 3141.

[0079] Specifically, a pressure plate is provided on the outer peripheral side of the exhaust component 3, and the pressure plate is sleeved on the outer peripheral side of the electromagnet coil 313. The bolt assembly passes through the through hole on the pressure plate to position the exhaust component 3 in the air port 13. One end of the stopper 314 has the same shape as the air port 13 and extends into the air port 13. A step hole, i.e., a positioning boss 132, is provided in the air port 13. The positioning boss 132 is used to abut the second sealing member 33 so that the second sealing member 33 is located at the top of the partition. It can be understood that the pressure plate achieves the positioning of the second sealing member 33 by abutting the end of the stopper 314 toward the second sealing member 33. The guide groove 3141 of the limit member 314 is consistent with the shape of the core body 312. The core body 312 and the spring 311 are both arranged in the guide groove 3141. When the core body 312 drives the first seal 32 to reciprocate along the axial direction of the air port 13, it plays a guiding role to prevent the first seal 32 from deviating and failing to close the connecting hole 331, thereby improving the stability and reliability of the first seal when moving.

[0080] Example 2

[0081] The structure of this embodiment is substantially the same as that of Embodiment 1, except that Figure 5 and Figure 6 As shown, the exhaust component 3 in this embodiment is a drive motor 34 and an output shaft 35, wherein the drive motor 34 is disposed in the air port 13, the output shaft 35 is connected to the drive motor 34, and the output shaft 35 reciprocates along the axial direction of the air port 13.

[0082] Specifically, the drive motor 34 is disposed in the air port 13 and is limited by the positioning boss 132. The drive motor 34 is provided with an output shaft 35 at one end facing the valve body 1. The output shaft 35 is used to reciprocate along the axial direction of the air port 13 to open or close the air port 13, thereby automatically introducing air or maintaining the air tightness of the valve body 1 under normal working conditions. It can be understood that the output shaft 35 is consistent with the size of the connection between the air port 13 and the valve body 1, and the drive motor 34 and the output shaft 35 are both drive structures used for reciprocating along the axial direction in the prior art, and will not be described in detail here.

[0083] In this embodiment, an exhaust hole 131 is provided in the air port 13 , an air inlet hole 14 is provided on the valve body 1 , the exhaust hole 131 is connected with the air inlet hole 14 , and when the air port 13 is closed, the output shaft 35 extends into the air inlet hole 14 and closes the air inlet hole 14 .

[0084] Specifically, the connection point between the valve body 1 and the air port 13 is the air inlet 14, and the output shaft 35 is consistent with the size of the air inlet 14, so that when making a reciprocating motion, the output shaft 35 extends into the air inlet 14, and the air inlet 14 is closed to prevent the outside air from entering the valve body 1. To ensure the air tightness of the valve body 1. When the centrifugal pump 300 is trapped, the output shaft 35 moves away from the air inlet 14 in the axial direction, and the air inlet 14 is opened and connected with the exhaust hole 131, so that the outside air can be smoothly introduced into the valve body 1, so as to realize automatic air intake.

[0085] In other embodiments, a guide surface is provided at the end of the air inlet 14 facing the drive motor 34 , and the guide surface is cylindrical in appearance, thereby increasing the success rate of the output shaft 35 extending into the air inlet 14 and improving the reliability of the valve body 1 .

[0086] In this embodiment, the exhaust assembly 3 further includes a sealing ring 36 , which is sleeved on the outer peripheral side of the end of the output shaft 35 extending into the air inlet 14 .

[0087] Specifically, a portion of the output shaft 35 used to extend into the air inlet hole 14 is sleeved with a sealing ring 36, which is close to the end of the output shaft 35 away from the drive motor 34. A mounting groove is provided along the radial direction of the output shaft 35. The mounting groove is an annular groove and its size is smaller than the size of the output shaft 35. The size of the sealing ring 36 is larger than the size of the air inlet hole 14, so that when the sealing ring 36 is sleeved on the portion of the output shaft 35 used to extend into the air inlet hole 14, an interference fit is formed with the inner wall of the air inlet hole 14, thereby further improving the airtightness of the end of the output shaft 35 extending into the air inlet hole 14.

[0088] In this embodiment, the air port 13 further includes a connecting member 4 . The connecting member 4 is covered on the driving motor 34 . The connecting member 4 and the air port 13 are connected by a bolt assembly.

[0089] Specifically, the connecting member 4 is a cylindrical structure and the cylindrical structure is used to accommodate the driving motor 34. A through hole is provided on the outer peripheral side of the connecting member 4 corresponding to the end of the air port 13, and a bolt assembly is passed through the through hole. When the driving motor 34 is positioned in the air port 13 through the connecting member 4, the two ends of the driving motor 34 are respectively limited by the connecting member 4 and the positioning boss 132 to prevent the driving motor 34 from moving in the air port, thereby improving the reliability of the exhaust assembly 3.

[0090] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A check valve, comprising a valve body and a check assembly arranged in the valve body, characterized in that: The check valve also includes: an exhaust component, which is arranged on the valve body and located between the water inlet of the valve body and the check component. The exhaust component and the liquid level sensor in the water tank are both electrically connected to the control board.

2. The check valve according to claim 1, characterized in that: The valve body is provided with an air port for accommodating the exhaust component, the air port is communicated with an inner flow channel of the valve body, and the exhaust component is detachably connected to the air port.

3. The check valve according to claim 2, characterized in that: The exhaust component includes a driving part, a first seal and a second seal. The second seal is arranged in the air port, and the first seal is connected to the driving part. The driving part is used to drive the first seal to reciprocate along the axial direction of the air port. When the first seal abuts against the second seal, the air port is closed, and when the first seal is away from the second seal, the air port is opened.

4. The check valve according to claim 3, characterized in that: An exhaust hole is provided in the air port, an air inlet hole is opened on the valve body, the second sealing member is provided between the exhaust hole and the air inlet hole and is positioned by a positioning boss, a connecting hole is provided at the axis of the second sealing member, the connecting hole is used to connect the air inlet hole and the exhaust hole, and when the air port is closed, the first sealing member is used to abut against the connecting hole.

5. The check valve according to claim 3, characterized in that: The driving part includes a spring, a core and an electromagnet coil. The core is located at the axis of the electromagnet coil and is arranged between the spring and the first sealing member.

6. The check valve according to claim 5, characterized in that: The driving part also includes a limiting member, one end of which abuts against the second sealing member and is positioned in the air port through a pressure plate. The limiting member is provided with a guide groove along the axis of the second sealing member, and the spring, the core body and the first sealing member are sequentially arranged in the guide groove.

7. The check valve according to claim 2, characterized in that: The exhaust assembly includes a driving motor and an output shaft. The driving motor is arranged in the air port. The output shaft is connected to the driving motor, and the output shaft reciprocates along the axial direction of the air port.

8. The check valve according to claim 7, characterized in that: An exhaust hole is arranged in the air port, an air inlet hole is opened on the valve body, the exhaust hole is communicated with the air inlet hole, and when the air port is closed, the output shaft extends into the air inlet hole and closes the air inlet hole.

9. The check valve according to claim 8, characterized in that: The exhaust assembly also includes a sealing ring, which is sleeved on the outer peripheral side of the end of the output shaft extending into the air inlet hole.

10. The check valve according to claim 7, characterized in that: The air port also includes a connecting piece, the connecting piece cover is arranged on the driving motor, and the connecting piece is connected to the air port through a bolt assembly.

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