Multi-union non-return pressure-maintaining electromagnetic valve

Abstract

The utility model discloses a multi-union non-return pressure-maintaining electromagnetic valve which comprises a shell, a plurality of independent valve cavities are arranged in the shell, an air inlet part is arranged in the shell, the air inlet part is arranged at one end of each valve cavity, and the air inlet part is communicated with the valve cavities, and the multi-union non-return pressure-maintaining electromagnetic valve is characterized in that each valve cavity comprises an air inflation part and an air exhaust part, an air inlet is communicated between the inflation part and the air inlet part, a soft spacer and a supporting piece are arranged between the inflation part and the air inlet part, the soft spacer covers the air inlet, and the supporting area of the supporting piece on the soft spacer is smaller than the area of the air inlet; one end of the deflation part penetrates through the shell, the other end of the deflation part is communicated with the inflation part, a plugging piece and a driving piece are arranged between the deflation part and the inflation part, a deflation opening is communicated between the inflation part and the deflation part, and the driving piece is used for driving the plugging piece to cover and abut against the deflation opening. The pressure maintaining device has the advantages that the pressure maintaining function can be achieved through small change of the structure in the inflation part, the overall structure is compact, and the pressure maintaining function is easy to achieve.

Description

Technical Field

[0001] The utility model relates to the field of multi-valve, in particular to a multi-valve non-return pressure-maintaining electromagnetic valve. Background Art

[0002] For some massage devices, air bags are provided to massage the user, and the massage function is achieved by controlling the inflation or deflation of the air bags.

[0003] However, the multi-valve system in massage equipment has the following drawbacks: when pressure maintenance is required, an external pressure-maintaining device or multiple pressure-maintaining valves are required to correspond to multiple valves, resulting in high power consumption, large size, and complex structure of the entire device. Therefore, there is room for improvement. Utility Model Content

[0004] The utility model provides a multi-connected non-return pressure-maintaining solenoid valve, which realizes the pressure-maintaining function by improving the internal structure of the multi-connected valve and reduces the volume and energy consumption of the entire device.

[0005] The utility model provides a multi-connected non-return pressure-maintaining solenoid valve adopts the following technical solutions:

[0006] A multi-connected non-return and pressure-maintaining solenoid valve, comprising a housing, a plurality of independent valve chambers being provided in the housing, an air inlet being provided in the housing, the air inlet being provided at one end of the plurality of valve chambers, the air inlet being connected to the plurality of valve chambers, and characterized in that the valve chambers comprise:

[0007] The inflation portion is provided between the air inlet portion and the deflation portion, the inflation portion and the air inlet portion are connected to each other through an air inlet, a soft spacer and a support member are provided between the inflation portion and the air inlet portion, the soft spacer covers the air inlet, and the support area of ​​the support member for the soft spacer is smaller than the area of ​​the air inlet;

[0008] The deflation part has one end passing through the shell and the other end communicating with the inflation part. A blocking member and a driving member are provided between the deflation part and the inflation part. A deflation port is communicated between the inflation part and the deflation part. The driving member is used to drive the blocking member to cover and press against the deflation port.

[0009] During inflation, the gas in the air inlet pushes away the soft diaphragm supported by the support member, causing the soft diaphragm to deform, thereby opening the air inlet and allowing gas to be filled into the inflatable portion. At the same time, the driving member is activated, pushing the blocking member close to the air release port, thereby covering and pressing against the air release port, preventing gas from being discharged from the air release port, thereby achieving stable inflation. When the airbag is inflated until it is full, when the air pressure in the inflatable portion is equal to the air pressure in the inlet portion, the two sides of the soft diaphragm are subjected to equal air pressure and restore their deformation. When the air pressure in the inflatable portion is greater than that in the inlet portion, the gas in the inflatable portion pushes the soft diaphragm against the air inlet, preventing gas from being discharged from the air inlet, and inflation can be stopped. Since the soft diaphragm is firmly covered at the air inlet by the pressure of the air pressure in the inflatable portion, stable pressure maintenance is achieved in the airbag, avoiding the need for an external pressure-maintaining device. The pressure-maintaining function can be achieved by making small changes to the structure in the inflatable portion. The overall structure is compact and easy to achieve the pressure-maintaining function.

[0010] Preferably, a guide hole is provided in the outer shell, the driving member includes a valve core slidably arranged in the guide hole, the inflation part and the deflation part are arranged at the two end openings of the guide hole, the valve core has an air vent connecting the inflation part and the deflation part, a coil is wound around the outer shell, the sealing member is arranged at one end of the valve core close to the deflation part, and the valve core and the inflation part are both metal parts.

[0011] During inflation, the coil is energized to generate a magnetic field, causing the valve core movably arranged in the wire frame to be magnetized and move toward the fixed degassing part, thereby driving the blocking member to move toward the degassing part, so that the blocking member is firmly clamped between the degassing part and the valve core, so that the blocking member firmly blocks the degassing port, blocking the inflation part and the degassing part and preventing ventilation, which is beneficial to reducing the situation where the internal volume is bulky due to the built-in driving motor or driving parts such as cylinders.

[0012] The air intake part, the inflation part and the wire rack are relatively fixed. The three can be fixed by welding or screws. In short, the three can be relatively regarded as an integrated shell.

[0013] Preferably, an elastic member is provided between the valve core and the air release portion, and mounting grooves are provided on the outer peripheries of the ends of the valve core and the air release portion that are close to each other, and both ends of the elastic member are respectively installed in the two mounting grooves.

[0014] Preferably, the inflation part includes a connected inflation channel and a connecting channel, one end of the inflation channel passes through the outer shell, and the other end of the inflation channel is connected to the connecting channel. The ventilation directions of the inflation channel and the connecting channel are different, and one end of the connecting channel is opposite to the guide hole. A stop piece is provided in the inflation part, and the stop piece is provided at the end of the valve core away from the blocking piece. The stop piece is used to separate the inflation channel and the connecting channel, and the elastic piece is always in a compressed state.

[0015] When the coil is powered off, the elastic part loses its magnetic restraint and is released, causing the valve core to move toward the end away from the air leak port. Pushed by the valve core, the stop member moves toward the connecting channel until it is pressed against the end of the connecting channel that is connected to the inflation channel. At this time, the sealing member is separated from the air leaking part, thereby restoring the connection between the air leaking part and the inflation channel, allowing the gas in the airbag to leak out from the air leaking part, thereby realizing the exhaust function.

[0016] Preferably, the support member is connected to the inner circumferential wall of the outer shell, the connecting channel passes through the support member, a accommodating cavity is left between the support member and the air inlet, the soft spacer is arranged in the accommodating cavity, the side of the support member close to the accommodating cavity is a conical surface, the circumferential wall of the inflatable part located in the accommodating cavity is also a conical surface, the conical surface of the inflatable part abuts the upper surface of the soft spacer, and the lower surface of the soft spacer abuts the top end of the support member; the side wall of the support member is also provided with an air vent, and the air vent is connected to the connecting channel and the accommodating cavity.

[0017] The support member supports the soft diaphragm. When the soft diaphragm is deformed by force, gas can flow from the air vent into the connecting channel, so that the gas can flow stably. At the same time, the arrangement of the two conical surfaces ensures that the soft diaphragm is firmly arranged in the accommodating cavity.

[0018] Preferably, one end of the valve core is connected with a connecting column and a clamping block in sequence, the stop member is set as a soft rubber block, a clamping groove is provided in the soft rubber block, a through hole is provided on one side of the soft rubber block, the through hole is connected to the clamping groove, and the clamping block is clamped in the clamping groove.

[0019] The stop piece and the valve core are assembled through structures that cooperate with each other, which helps to reduce the situation where the two are assembled by glue and the viscosity of the glue becomes poor, thereby causing the two to separate, so that the stop piece and the valve core can be firmly connected.

[0020] Preferably, a limiting groove is recessed at one end of the valve core, the sealing member is embedded in the limiting groove, the sealing member is a soft rubber block, the peripheral wall of the limiting groove is integrally connected with a limiting ring, and the outer periphery of the sealing member is provided with a slot for inserting the limiting ring.

[0021] During assembly, simply insert the plugging piece into the restriction groove until the restriction ring aligns with the slot. The soft rubber plugging piece also cushions the impact between the valve core and the deflation section, effectively reducing the noise caused by gas vibration during inflation.

[0022] Preferably, an air collecting port is provided at one end of the air release portion close to the valve core, and the cross-sectional area of ​​the air collecting port is smaller than the cross-sectional area of ​​the blocking member.

[0023] The cross-sectional area of ​​the gas collecting port is smaller than the cross-sectional area of ​​the blocking member, so that the gas leakage port is easier to block, and the gas leakage port can be stably blocked during inflation.

[0024] Preferably, a sealing groove is formed on the outer periphery of the air release portion, a sealing ring is provided in the sealing groove, and the sealing ring is tightly pressed against the inner peripheral wall of the shell.

[0025] The provision of the sealing ring makes it more difficult for gas to leak from between the air leaking part and the shell.

[0026] Preferably, the shape of the peripheral wall of the valve core and the shape of the guide hole are adapted to form a cylindrical surface, and a spacing surface is cut on the side wall of the valve core, and the spacing surface and the peripheral wall of the guide hole form a vent hole.

[0027] In summary, the present invention has the following beneficial technical effects:

[0028] During inflation, the gas in the air inlet pushes away the soft diaphragm supported by the support member, causing the soft diaphragm to deform, thereby opening the air inlet and allowing gas to be filled into the inflatable portion. At the same time, the driving member is activated, pushing the blocking member close to the air release port, thereby covering and pressing against the air release port, preventing gas from being discharged from the air release port, thereby achieving stable inflation. When the airbag is inflated until it is full, when the air pressure in the inflatable portion is equal to the air pressure in the inlet portion, the two sides of the soft diaphragm are subjected to equal air pressure and restore their deformation. When the air pressure in the inflatable portion is greater than that in the inlet portion, the gas in the inflatable portion pushes the soft diaphragm against the air inlet, preventing gas from being discharged from the air inlet, and inflation can be stopped. Since the soft diaphragm is firmly covered at the air inlet by the pressure of the air pressure in the inflatable portion, stable pressure maintenance is achieved in the airbag, avoiding the need for an external pressure-maintaining device. The pressure-maintaining function can be achieved by making small changes to the structure in the inflatable portion. The overall structure is compact and easy to achieve the pressure-maintaining function. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The utility model is a schematic diagram of the overall structure of a multi-connected non-return pressure-maintaining solenoid valve.

[0030] Figure 2 It is a cross-sectional view of a multi-connected non-return and pressure-maintaining solenoid valve of the utility model.

[0031] Figure 3 It is a structural diagram that considers the shell as a whole.

[0032] Explanation of the accompanying drawings: 1. Shell; 2. Air inlet part; 21. Air inlet port; 22. Soft diaphragm; 23. Support member; 24. Accommodating chamber; 3. Inflating part; 31. Inflating channel; 32. Connecting channel; 33. Stop member; 34. Air vent; 4. Air discharge part; 41. Sealing member; 411. Slot; 42. Air discharge port; 43. Valve core; 431. Restriction groove; 432. Restriction ring; 433. Anti-slip ring; 44. Air vent; 45. Mounting groove; 46. Connecting column; 47. Block; 48. Air collecting port; 49. Sealing groove; 491. Sealing ring; 5. Guide hole; 6. Coil. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-3 The utility model is described in further detail.

[0034] The embodiment of the utility model discloses a multi-connected non-return and pressure-maintaining solenoid valve.

[0035] Reference Figure 1 A multi-connected non-return and pressure-maintaining solenoid valve includes a housing 1, a plurality of independent valve chambers are provided in the housing 1, an air inlet 2 is provided in the housing 1, the air inlet 2 is provided at one end of the plurality of valve chambers, the air inlet 2 is connected to the plurality of valve chambers, and the valve chambers include:

[0036] The inflation portion 3 is provided between the air inlet portion 2 and the deflation portion 4. An air inlet 21 is communicated between the inflation portion 3 and the air inlet portion 2. A soft spacer 22 and a support member 23 are provided between the inflation portion 3 and the air inlet portion 2. The soft spacer 22 covers the air inlet 21. The support area of ​​the support member 23 for the soft spacer 22 is smaller than the area of ​​the air inlet 21.

[0037] The deflation part 4 has one end passing through the outer shell 1 and the other end communicating with the inflation part 3. A blocking member 41 and a driving member are provided between the deflation part 4 and the inflation part 3. A deflation port 42 is communicated between the inflation part 3 and the deflation part 4. The driving member is used to drive the blocking member 41 to cover and press against the deflation port 42.

[0038] During inflation, the gas in the air inlet 2 pushes away the soft diaphragm 22 supported by the support member 23, causing the soft diaphragm 22 to deform, thereby opening the air inlet 21 and allowing gas to be filled into the inflation portion 3. At the same time, the driving member is activated, pushing the blocking member 41 toward the air release port 42, thereby covering and pressing against the air release port 42, preventing gas from being discharged from the air release port 42, thereby achieving stable inflation. When the airbag is inflated until it is full, when the air pressure in the inflation part 3 is equal to the air pressure in the air inlet part 2, the two sides of the soft diaphragm 22 are subjected to equal air pressure and restore their deformation. Then, when the air pressure in the inflation part 3 is greater than that in the air inlet part 2, the gas in the inflation part 3 pushes the soft diaphragm 22 against the air inlet 21, so that the gas cannot be discharged from the air inlet 21, and inflation can be stopped. Since the soft diaphragm 22 is firmly fitted and covered at the air inlet 21 by the pressure of the air pressure in the inflation part 3, stable pressure maintenance is achieved in the airbag, avoiding the need for an external pressure maintenance device, and the pressure maintenance function can be achieved by a small change in the structure in the inflation part 3. The overall structure is compact and the pressure maintenance function is easy to achieve.

[0039] Reference Figure 1 as well as Figure 2In this embodiment, a guide hole 5 is opened in the shell 1, and the driving member includes a valve core 43 slidably set in the guide hole 5. The inflation part 3 and the deflation part 4 are respectively arranged at the two end openings of the guide hole 5. The valve core 43 has a vent hole 44 connecting the inflation part 3 and the deflation part 4. A coil 6 is wound around the outside of the shell 1. The sealing member 41 is arranged at one end of the valve core 43 close to the deflation part 4. The valve core 43 and the inflation part 3 are both metal parts.

[0040] During inflation, the coil 6 is energized to generate a magnetic field, so that the valve core 43 movably arranged in the wire frame is magnetized and moves toward the fixed degassing part 4, thereby driving the blocking member 41 to move toward the degassing part 4, so that the blocking member 41 is firmly clamped between the degassing part 4 and the valve core 43, so that the blocking member 41 firmly blocks the degassing port 42, so that the inflation part 3 and the degassing part 4 are blocked and cannot be ventilated, which is beneficial to reducing the situation where the internal volume is bulky due to the internal drive motor or cylinder.

[0041] The air inlet 2, the air filling part 3 and the wire rack are relatively fixed. The three can be fixed by welding or screws. In short, the three can be relatively regarded as Figure 3 The housing 1 is shown as an integral arrangement.

[0042] Reference Figure 1 as well as Figure 3 In this embodiment, an elastic member is provided between the valve core 43 and the air release portion 4. The outer periphery of the end of the valve core 43 and the air release portion 4 close to each other is provided with a mounting groove 45, and the two ends of the elastic member are respectively installed in the two mounting grooves 45.

[0043] Reference Figure 1 as well as Figure 3 In this embodiment, the inflation portion 3 includes a connected inflation channel 31 and a connecting channel 32. One end of the inflation channel 31 passes through the shell 1, and the other end of the inflation channel 31 is connected to the connecting channel 32. The ventilation directions of the inflation channel 31 and the connecting channel 32 are different. One end of the connecting channel 32 faces the guide hole 5. A stop member 33 is provided in the inflation portion 3. The stop member 33 is provided at the end of the valve core 43 away from the blocking member 41. The stop member 33 is used to separate the inflation channel 31 and the connecting channel 32, and the elastic member is always in a compressed state.

[0044] When the coil 6 is powered off, the elastic part loses its magnetic restraint and is released, causing the valve core 43 to move toward the end away from the air vent 42. Pushed by the valve core 43, the stop member 33 moves toward the connecting channel 32 until it is pressed against the end of the inflation channel 31 connected to the connecting channel 32. At this time, the blocking member 41 is separated from the air vent part 4, so that the air vent part 4 and the inflation channel 31 are restored to a connected state, allowing the gas in the airbag to leak out from the air vent part 4, thereby realizing the exhaust function.

[0045] Reference Figure 1 as well as Figure 3 In this embodiment, the support member 23 is connected to the inner peripheral wall of the shell 1, and the connecting channel 32 passes through the support member 23. A accommodating chamber 24 is left between the support member 23 and the air inlet 21. The soft septum 22 is arranged in the accommodating chamber 24. The side of the support member 23 close to the accommodating chamber 24 is a conical surface, and the peripheral wall of the inflatable portion 3 located in the accommodating chamber 24 is also a conical surface. The conical surface of the inflatable portion 3 abuts the upper surface of the soft septum 22, and the lower surface of the soft septum 22 abuts the top end of the support member 23; the side wall of the support member 23 is also provided with an air vent 34, which connects the connecting channel 32 and the accommodating chamber 24.

[0046] The support member 23 supports the soft diaphragm 22. When the soft diaphragm 22 is deformed by force, gas can flow into the connecting channel 32 from the air vent 34, ensuring stable gas flow. At the same time, the arrangement of the two conical surfaces ensures that the soft diaphragm 22 is firmly set in the accommodating cavity 24.

[0047] Reference Figure 1 as well as Figure 3 In this embodiment, one end of the valve core 43 is connected to a connecting column 46 and a clamping block 47 in sequence, and the stop member 33 is set as a soft rubber block. A clamping groove is provided in the soft rubber block, and a through hole is provided on one side of the soft rubber block. The through hole is connected to the clamping groove, and the clamping block 47 is clamped in the clamping groove.

[0048] The stop member 33 and the valve core 43 are assembled by means of structures that cooperate with each other, which helps to reduce the situation where the two are assembled by glue and the viscosity of the glue deteriorates, thereby causing the two to separate, so that the stop member 33 and the valve core 43 can be firmly connected.

[0049] Reference Figure 1 as well as Figure 3 In this embodiment, a limiting groove 431 is recessed at one end of the valve core 43, and the blocking member 41 is embedded in the limiting groove 431. The blocking member 41 is a soft rubber block. The peripheral wall of the limiting groove 431 is integrally connected with a limiting ring 432. The outer periphery of the blocking member 41 is provided with a slot 411 for inserting the limiting ring 432.

[0050] During assembly, the sealing member 41 is inserted directly into the limiting groove 431 until the limiting ring 432 aligns with the slot 411. The soft rubber sealing member 41 also cushions the impact between the valve core 43 and the air release portion 4, effectively reducing the noise caused by gas vibrations during inflation.

[0051] Reference Figure 1 as well as Figure 3 In this embodiment, an air collecting port 48 is provided at one end of the air release portion 4 close to the valve core 43 , and the cross-sectional area of ​​the air collecting port 48 is smaller than the cross-sectional area of ​​the blocking member 41 .

[0052] The cross-sectional area of ​​the gas collecting port 48 is smaller than the cross-sectional area of ​​the blocking member 41 , making it easier to block the gas leak port 42 , so that the gas leak port 42 can be stably blocked during inflation.

[0053] Reference Figure 1 as well as Figure 3 In this embodiment, a sealing groove 49 is formed on the outer periphery of the air release portion 4 , and a sealing ring 491 is provided in the sealing groove 49 . The sealing ring 491 is tightly pressed against the inner peripheral wall of the housing 1 .

[0054] The provision of the sealing ring 491 makes it more difficult for gas to leak from between the gas leaking portion 4 and the housing 1 .

[0055] Reference Figure 1 as well as Figure 3 In this embodiment, the shape of the peripheral wall of the valve core 43 is adapted to the shape of the guide hole 5 and is set to a cylindrical surface. A spacing surface is cut on the side wall of the valve core 43, and the spacing surface and the peripheral wall of the guide hole 5 form a vent hole 44.

[0056] Reference Figure 1 as well as Figure 3 In this embodiment, an anti-slip ring 433 is fixed to the outer periphery of the valve core 43, and a distance is left between the anti-slip ring 433 and the spacing surface.

[0057] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-connected non-return and pressure-maintaining solenoid valve, comprising a housing, a plurality of independent valve chambers disposed in the housing, an air inlet disposed in the housing, the air inlet disposed at one end of the plurality of valve chambers, the air inlet communicating with the plurality of valve chambers, characterized in that: The valve chamber comprises: The inflation portion is provided between the air inlet portion and the deflation portion, the inflation portion and the air inlet portion are connected to each other through an air inlet, a soft spacer and a support member are provided between the inflation portion and the air inlet portion, the soft spacer covers the air inlet, and the support area of ​​the support member for the soft spacer is smaller than the area of ​​the air inlet; The deflation part has one end passing through the shell and the other end communicating with the inflation part. A blocking member and a driving member are provided between the deflation part and the inflation part. A deflation port is communicated between the inflation part and the deflation part. The driving member is used to drive the blocking member to cover and press against the deflation port.

2. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 1, characterized in that: A guide hole is provided in the outer shell, and the driving member includes a valve core slidably arranged in the guide hole. The inflation part and the deflation part are arranged at the openings at both ends of the guide hole. The valve core has an air vent connecting the inflation part and the deflation part. A coil is wound around the outer shell, and the sealing member is arranged at one end of the valve core close to the deflation part. The valve core and the inflation part are both metal parts.

3. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 2, characterized in that: An elastic member is provided between the valve core and the air release portion. Mounting grooves are provided on the outer peripheries of the ends of the valve core and the air release portion that are close to each other. Both ends of the elastic member are respectively mounted in the two mounting grooves.

4. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 3, characterized in that: The inflation part includes a connected inflation channel and a connecting channel, one end of the inflation channel passes through the outer shell, and the other end of the inflation channel is connected to the connecting channel. The ventilation directions of the inflation channel and the connecting channel are different, and one end of the connecting channel is opposite to the guide hole. A stop piece is provided in the inflation part, and the stop piece is provided at the end of the valve core away from the blocking piece. The stop piece is used to separate the inflation channel and the connecting channel, and the elastic piece is always in a compressed state.

5. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 4, characterized in that: The support member is connected to the inner peripheral wall of the outer shell, the connecting channel passes through the support member, and an accommodating cavity is left between the support member and the air inlet. The soft spacer is arranged in the accommodating cavity. The side of the support member close to the accommodating cavity is a conical surface, and the peripheral wall of the inflatable part located in the accommodating cavity is also a conical surface. The conical surface of the inflatable part abuts the upper surface of the soft spacer, and the lower surface of the soft spacer abuts the top end of the support member; the side wall of the support member is also provided with an air vent, and the air vent is connected to the connecting channel and the accommodating cavity.

6. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 4, characterized in that: One end of the valve core is connected to a connecting column and a clamping block in sequence. The stop member is set as a soft rubber block. A clamping groove is provided in the soft rubber block. A through hole is provided on one side of the soft rubber block. The through hole is connected to the clamping groove, and the clamping block is clamped in the clamping groove.

7. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 4, characterized in that: A limiting groove is recessed at one end of the valve core, and the blocking piece is embedded in the limiting groove. The blocking piece is a soft rubber block, and a limiting ring is integrally connected to the peripheral wall of the limiting groove. A slot for inserting the limiting ring is provided on the outer periphery of the blocking piece.

8. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 7, characterized in that: An air collecting port is provided at one end of the air release portion close to the valve core, and the cross-sectional area of ​​the air collecting port is smaller than the cross-sectional area of ​​the blocking member.

9. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 8, characterized in that: A sealing groove is provided on the outer periphery of the air release portion, a sealing ring is provided in the sealing groove, and the sealing ring is tightly pressed against the inner peripheral wall of the shell.

10. The multi-connected non-return and pressure-maintaining solenoid valve according to claim 4, characterized in that: The shape of the peripheral wall of the valve core and the shape of the guide hole are adapted to form a cylindrical surface. A spacing surface is cut on the side wall of the valve core, and the spacing surface and the peripheral wall of the guide hole form a vent hole.

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