A gas self-closing valve

Abstract

The present invention provides a gas self-closing valve, which belongs to the field of valve technology. It solves the problem that the existing gas self-closing valve is prone to misoperation and affects the normal use of gas. The gas self-closing valve includes a valve body and a valve core. A valve hole is opened in the valve body. A membrane, a magnetic suction component and a valve control structure are arranged between the valve body and the valve core. The valve core can be suspended in a normal valve opening position to keep the valve hole open through the membrane and the valve control structure. After the valve core moves downward and upward at the normal valve opening position, the valve core can close the valve hole and keep it closed through the magnetic suction component. The valve core includes a valve stem. After the upper end of the valve stem passes through the valve body, a button is fixed. The button is covered with a button cover. The lower end surface of the button cover is against the upper end surface of the valve body. When the valve core is suspended in the normal valve opening position, the upper end surface of the button is flush with the upper end of the button cover. The gas self-closing valve can reduce the failure of gas to be used normally due to misoperation.

Description

Technical Field

[0001] The invention belongs to the technical field of valves and relates to a gas self-closing valve. Background Art

[0002] Gas is a widely used gas fuel. Due to its flammable, explosive and toxic properties, gas leakage can easily cause major safety accidents. Therefore, it is necessary to ensure that the gas entering the gas appliance is kept at a normal pressure so that the gas can burn stably and fully. Generally, a gas self-closing valve is installed in front of the stove to automatically close the valve when overpressure or underpressure occurs to prevent gas leakage.

[0003] A pipeline gas safety self-closing valve disclosed in Chinese patent literature [application number: CN200920032912.1, announcement number: CN201513567U] comprises an upper cover, a lower cover and a valve body, wherein an air inlet end and an air outlet end are arranged at both ends of the valve body, a valve hole is arranged in the middle of the valve body, the valve hole divides the valve body into an upper cavity and a lower cavity, an air vent is arranged on one side of the upper cavity of the valve body, a membrane is arranged between the valve body and the upper cover, an iron sheet is arranged in the middle of the membrane, a sealing gasket is arranged at the bottom of the membrane, a permanent magnetic alloy is arranged on the valve body at a position corresponding to the iron sheet in the membrane, a core rod is arranged in the middle of the membrane of the valve body, a handle is arranged on the top end of the core rod extending out of the upper cover, a boss is arranged in the middle of the core rod, a high-pressure regulating sheet is arranged in the upper cover, one end of the high-pressure regulating sheet is close to the core rod, and a high-pressure sealing sheet and an iron sheet are arranged at the bottom of the core rod.

[0004] In the initial state, the pressure in the upper and lower cavities of the valve body is zero. The membrane and the embedded iron sheet in the upper cavity move downward under the magnetic field of the permanent magnet alloy, and the sealing gasket blocks the valve hole. At this time, the upper cavity is isolated from the lower cavity, and no gas passes through the valve body. In normal use, lift the handle until the blue scale line on the core rod is exposed. At this time, the boss on the core rod is blocked by the high-pressure regulating plate to move upward. At the same time, the pressure in the pipeline causes the membrane and the sealing gasket to move upward, open the valve hole, and pressurized gas enters the valve body. This state is a normal working state. When the input pressure of the gas is greater than the upper limit of the set normal working pressure, the membrane will move upward under the action of pressure, driving the boss on the core rod to push open the high-pressure regulating plate, and the red scale line on the core rod is exposed. The core rod pulls the high-pressure sealing plate to the valve hole to close the valve hole, and the upper cavity and the lower cavity are isolated. No gas passes through the valve body. At this time, it is a high-pressure closed state. In the high-pressure closed state, when there is no external force, the high-pressure sealing piece is adsorbed on the valve hole, the closed state will not change, and will not move with the pressure change in the pipeline, maintaining the isolation between the upper cavity and the lower cavity. When the abnormal state disappears and normal operation is required, the core rod needs to be pushed back to the blue scale line to expose, and the normal operation can be continued. In the normal working state, when the gas pressure is less than the set working pressure, such as: gas outage, abnormal gas pressure, gas appliance disconnection, pipeline damage, etc., the iron sheet in the membrane moves downward under the action of the magnetic field, driving the sealing gasket on the membrane to close the valve hole, isolating the upper cavity from the lower cavity. At this time, it is a low-pressure closed state, which is the initial state.

[0005] The above self-closing valve uses blue scale lines and red scale lines to mark the position of the valve core. When no scale lines are exposed, the self-closing valve is in a low-pressure closed state, when only the blue scale lines are exposed, the self-closing valve is in a normal working state, and when the blue scale lines and red scale lines are exposed, the self-closing valve is in a high-pressure closed state. On the one hand, it is very inconvenient to observe the tiny scale lines, and on the other hand, the color on the scale lines will fade during long-term use, which is easy to cause unrecognition. In addition, it is also very unfriendly to users with color weakness and color blindness. When the user makes mistakes in observing and judging the scale lines, and pulls or presses the handle of the self-closing valve in a normal working state, if the user pulls the handle, the core rod moves upward, and the iron sheet at the bottom of the core rod will continue to move upward under the action of the permanent magnetic alloy magnetic field, so that the high-pressure sealing sheet closes the valve hole; if the user presses the handle, the core rod moves downward, and the iron sheet in the membrane will continue to move downward under the action of the permanent magnetic alloy magnetic field, so that the sealing gasket on the membrane closes the valve hole. However, the self-closing valve cannot automatically recover after closing, and gas will not be supplied normally, which greatly affects the user experience. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems existing in the prior art and propose a gas self-closing valve to solve the technical problem that the existing gas self-closing valve is prone to misoperation and affects the normal use of gas.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A gas self-closing valve comprises a valve body and a valve core, wherein a valve hole is formed in the valve body, and a membrane, a magnetic attraction component and a valve control structure are arranged between the valve body and the valve core. The membrane and the valve control structure can enable the valve core to hover in a normal valve opening position to keep the valve hole open, and the valve core can close and keep the valve hole closed by the magnetic attraction component after moving downward and upward at the normal valve opening position. The valve core comprises a valve stem, and a button is fixed to the upper end of the valve stem after passing through the valve body. The button is characterized in that a button cover is mounted on the outer surface of the button, and the lower end surface of the button cover is abutted against the upper end surface of the valve body. When the valve core hovers in the normal valve opening position, the upper end surface of the button is flush with the upper end of the button cover.

[0009] When the gas self-closing valve is installed in the pipeline, the button faces upward and the button sleeve is mounted outside the button. Under the action of gravity, the lower end surface of the button sleeve is against the upper end surface of the valve body. When the valve core of the gas self-closing valve is suspended in the normal valve opening position, the gas self-closing valve is in an open state and the gas can be used normally. At this time, the upper end surface of the button is flush with the upper end of the button sleeve. When the valve core deviates from the normal valve opening position and moves upward or downward, the valve core will automatically close the valve hole under the action of the magnetic suction component, so that the gas self-closing valve is in a closed state and remains closed. After the valve core moves downward, the button moves downward with the valve core, and the upper end surface of the button sinks into the button sleeve. After the valve core moves upward, the button moves upward with the valve core, and the upper end surface of the button protrudes from the upper end of the button sleeve. In this way, the user can easily understand the position of the valve core by observing the relative position of the upper end surface of the button and the upper end of the button sleeve, thereby reducing the occurrence of misjudgment and misoperation.

[0010] Even if a misjudgment is made through observation when the valve core is in the normal valve opening position, since the part of the valve stem extending out of the valve body and the button are protected in the button cover, the user can only touch the upper end surface of the button cover and the button. At this time, the user can further understand the position of the valve core by touching it. Since the upper end surface of the button cover is flush with the upper end of the button when the valve core is in the normal valve opening position, the upper end of the button cover will be touched at the same time as the upper end surface of the button is touched. In this way, touching will not cause the button to be pulled up or pressed. At this time, the user can understand the real valve core position by touch, and touching will not trigger the valve core to move up and down, so that the misjudgment can be corrected, and the self-closing valve will not be further misoperated. Therefore, the gas self-closing valve can reduce the failure of gas to be used normally due to misoperation.

[0011] In order to ensure the stability of the valve, the valve core related parts should not be touched when judging the valve core position, because the touching process can easily cause the position of the valve core to change and affect the opening of the valve. The gas self-closing valve cleverly protects the button and the valve stem through the setting of the button cover. Since the upper end surface of the button cover is flush with the upper end of the button when the gas self-closing valve is in normal use, the button and the button cover will not move up or down when touched. At the same time, the position of the valve core can be distinguished by the relative position of the button and the button cover, which greatly reduces misoperation and ensures the stability of the self-closing valve.

[0012] In the above-mentioned gas self-closing valve, the upper end surface of the button is a plane, which not only makes it more direct and accurate to observe the position of the button and the button cover, but also does not cause the button to move when touched, which can further reduce the gas not being able to be used normally due to misoperation, and ensure the stability of the self-closing valve.

[0013] In the above-mentioned gas self-closing valve, a boss is protruding from the upper end surface of the valve body, a through hole is opened on the boss, the valve stem is inserted in the through hole, and the button sleeve includes a cylindrical sleeve body, and a retaining ring protruding inward is provided on the inner side surface of the sleeve body. The retaining ring is located below the button, and the retaining ring is sleeved outside the boss and forms a radial limit with the boss.

[0014] The boss and the retaining ring form a limiting effect to prevent the button cover from making a large radial movement when the button cover is touched, which may cause the button to swing radially. At the same time, the boss separates the retaining ring from the valve stem to prevent the shaking of the button cover when it is touched from affecting the valve stem, so that the valve core will not swing and affect the stability of the valve core in the normal open valve position, ensuring that touching the button cover will not affect the normal use of the gas and ensuring the stability of the self-closing valve.

[0015] In the above-mentioned gas self-closing valve, the button sleeve can be raised and lowered along the boss, a limit lift retaining spring is fixed on the outer side surface of the boss, the retaining ring is located below the limit lift retaining spring, and after the button sleeve rises, the retaining ring can abut against the limit lift retaining spring, when the valve core is suspended in the normal valve opening position and the button sleeve rises to the point where the retaining ring abuts against the limit lift retaining spring, an anti-interference gap is provided between the upper end surface of the retaining ring and the lower end surface of the button.

[0016] The lift-limiting retaining spring limits the rising position of the button cover. When the user makes a misjudgment and lifts the button cover, the retaining ring will abut against the lift-limiting retaining spring after the button cover is lifted. At this time, there is an anti-interference gap between the retaining ring and the button, and the button cover does not act on the button. Neither the button nor the valve stem will move. Therefore, this can effectively avoid the failure of normal use of gas caused by misoperation and make the use of the gas self-closing valve stable.

[0017] In the above-mentioned gas self-closing valve, a receiving groove is arranged on the lower end surface of the button, and the protruding column is located in the receiving groove when the valve core is suspended in the normal valve opening position.

[0018] The convex column and the receiving groove form a concave-convex structure, which can reduce the entry of foreign impurities into the valve body through the through hole, reduce the deformation of parts in the valve body due to contact with impurities, and make the gas self-closing valve work stably.

[0019] In the above-mentioned gas self-closing valve, the valve stem includes a valve control section, which is inserted into the valve hole and cooperates with the valve hole gap. The valve control section can slide up and down in the valve hole. A notch is provided on the outer side surface of the valve control section. The axial length of the notch is greater than the axial length of the valve hole. An upper seal and a lower seal are respectively fixed above and below the notch on the valve control section. The upper seal can abut against the upper edge of the valve hole and form a seal, and the lower seal can abut against the lower edge of the valve hole and form a seal.

[0020] When the valve core is suspended in the normal valve opening position, both seal 1 and seal 2 are separated from the valve hole to open the valve hole. Since the axial length of the notch is greater than the axial length of the valve hole, an air passage is formed between the hole wall of the valve hole and the outer side surface of the valve control section at the notch, and the valve hole can be ventilated normally through the air passage formed at the notch. If the valve stem moves up, the lower seal can close the valve hole under the action of the magnetic suction component. If the valve stem moves down, the upper seal can close the valve hole under the action of the magnetic suction component. After the notch is set, normal ventilation is guaranteed, and the valve hole and the valve control section form a clearance fit, so that the valve hole has a guiding and limiting effect on the valve control section, so that the valve stem slides up and down in the valve hole stably, and at the same time, the valve stem is not prone to radial shaking in the valve hole, so that touching the button and button cover will not cause radial shaking of the valve core and affect the normal use of gas.

[0021] In the above-mentioned gas self-closing valve, the upper sealing member and the lower sealing member are both made of elastic material, and an upper flared surface in the shape of an inverted cone is provided at the upper edge of the valve hole, and the upper sealing member can abut against the upper flared surface and form a seal, and a lower flared surface in the shape of a cone is provided at the lower edge of the valve hole, and the lower sealing member can abut against the lower flared surface and form a seal.

[0022] When the magnetic force generated by the magnetic attraction component causes the upper seal to press against the upper flared surface, due to the inverted cone shape of the upper flared surface, the upper seal is subjected to radial and axial partial pressures, causing the upper seal to deform radially and axially, thereby forming a more stable seal between the upper seal and the upper flared surface. Similarly, a more stable seal can also be achieved between the lower seal and the lower flared surface, thereby ensuring the safety of the gas self-closing valve.

[0023] In the above-mentioned gas self-closing valve, the valve control structure includes a limit spring fixed in the accommodating groove, and the outer surface of the convex column has a convex ring corresponding to the limit spring. When the valve core is suspended in the normal valve opening position, the limit spring elastically abuts against the lower side of the convex ring, and when the external force applied to the valve stem is greater than the resistance of the limit spring to the convex ring, the limit spring can pass through the convex ring.

[0024] The diaphragm is used to sense the change of gas pressure in the valve body. When the gas pressure in the valve body is greater than the resistance of the limit spring to the convex ring, the diaphragm is stressed to make the limit spring pass through the convex ring, the valve stem moves upward, and then the valve core closes the valve hole under the action of the magnetic component. The setting of the limit spring and the convex ring cooperates with the diaphragm to enable the valve core to hover in the normal valve opening position under normal gas pressure. In addition, the limit spring is set on the button to facilitate the installation of the limit spring, while avoiding interference between the magnetic component and the limit spring, so that the gas self-closing valve can work stably.

[0025] In the above-mentioned gas self-closing valve, the magnetic attraction component includes a magnet, an upper iron ring and a lower iron ring, the magnet is fixedly connected to the valve stem, the upper iron ring and the lower iron ring are fixed on the valve body, and the upper iron ring is located above the magnet, and the lower iron ring is located below the magnet; the valve stem includes a fixed section fixed to the diaphragm, the fixed section is located above the valve hole, and a protruding fixing ring is provided on the outer side surface of the fixed section, the magnet is mounted on the fixed section and fixed, the magnet is located above the fixing ring, the inner edge of the diaphragm is pressed and fixed between the fixing ring and the magnet, an inner positioning groove is provided on the upper end surface of the fixing ring, and a protruding inner positioning ring is provided on the lower surface of the inner edge of the diaphragm, and the inner positioning ring is embedded in the inner positioning groove.

[0026] When the valve stem moves upward, the distance between the upper iron ring and the magnet becomes smaller. Under the action of the magnetic force between the upper iron ring and the magnet, the valve stem continues to move upward so that the valve core closes the valve hole; when the valve stem moves downward, the distance between the lower iron ring and the magnet becomes smaller. Under the action of the magnetic force between the lower iron ring and the magnet, the valve stem continues to move downward so that the valve core closes the valve hole. The magnetic suction assembly is set in this way to automatically close the valve hole when the air pressure changes, ensuring the safety of the use of the gas self-closing valve. The inner positioning ring and the inner positioning groove have a positioning function, so that the inner edge of the membrane is fixed and stable on the valve stem. The membrane is pressed and fixed by the magnet, and the membrane is fixed while the magnet is fixed, so that the membrane is easy to assemble on the valve stem.

[0027] In the above-mentioned gas self-closing valve, the valve body includes a main body and a cover body, the outer edge of the membrane is pressed between the upper end surface of the main body and the lower end surface of the cover body, the upper end surface of the main body is provided with an annular connecting ring on the outside of the membrane, the lower end of the cover body is inserted into the connecting ring and forms a threaded connection, or the lower end surface of the cover body is provided with an annular connecting ring on the outside of the membrane, the upper end of the main body is inserted into the connecting ring and forms a threaded connection.

[0028] In this way, the outer edge of the membrane is wrapped in the connecting ring, so that the membrane does not contact the external environment and has a longer service life, ensuring the stability and safety of the long-term use of the gas self-closing valve. At the same time, the lower end of the cover body is inserted into the connecting ring of the main body to form a threaded connection, or the upper end of the main body is inserted into the connecting ring of the cover body to form a threaded connection. When the thread is completely covered by the connecting ring, the position of the seam is not easy to see from the appearance of the valve body, which can prevent the main body and the cover body from being disassembled by the user and affecting the normal use of the self-closing valve.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] A button cover is installed outside the button, and the lower end face of the button cover is against the upper end face of the valve body. When the valve core is suspended in the normal valve opening position, the upper end face of the button is flush with the upper end of the button cover. The position of the valve core can be more conveniently understood through the position of the button cover and the button, reducing misjudgment and misoperation. Moreover, the button cover and the button can be touched without causing the change of the position of the valve core, further reducing the occurrence of misoperation, having the function of preventing misoperation, and making the use of the gas self-closing valve stable. The setting of the valve control section on the valve stem, the valve control structure between the button and the valve body, the connection structure between the main body and the cover body in the valve body, the fixing structure of the membrane on the valve body and the valve stem, and the setting of the lifting limit spring all ensure the stability and safety of the use of the gas self-closing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a cross-sectional view of the first embodiment of the gas self-closing valve when the valve core is in a normal valve opening position;

[0032] Figure 2 yes Figure 1 A partial enlarged view of the middle button;

[0033] Figure 3 yes Figure 1 A local magnified view of the middle epithelium;

[0034] Figure 4 yes Figure 1 A partial enlarged view of the middle valve hole;

[0035] Figure 5 yes Figure 1 A partial enlarged view of the button after the middle button cover is lifted;

[0036] Figure 6 It is a three-dimensional diagram of the valve core in the first embodiment of the gas self-closing valve;

[0037] Figure 7 It is a three-dimensional diagram of the button in the first embodiment of the gas self-closing valve;

[0038] Figure 8 It is a cross-sectional view of the first embodiment of the gas self-closing valve when the valve core is in the under-pressure valve closing position;

[0039] Fig. 9 It is a cross-sectional view of the first embodiment of the gas self-closing valve when the valve core is in the overpressure valve closing position;

[0040] Fig.10 It is a cross-sectional view of the valve core in the second embodiment of the gas self-closing valve when it is in the normal valve opening position.

[0041] In the figure, 1, valve body; 2, body; 2a, connecting ring; 2b, air inlet; 2c, air outlet; 2d, outer positioning groove; 3, cover body; 3a, cover top; 3a1, through hole; 3a2, boss; 3a3, positioning platform; 3b, additional positioning ring; 4, valve seat; 4a, valve hole; 4a1, upper flared surface; 4a2, lower flared surface; 4b, positioning boss; 5, valve core; 6, valve stem; 6a, valve control section; 6a1, notch; 6b, fixed section; 6b1, fixed ring; 6b2, inner positioning groove; 6c, connecting section; 7, upper sealing member; 8. Lower seal; 9. Button; 9a. Receiving groove; 9b. Avoidance recess; 10. Magnetic attraction assembly; 10a. Magnet; 10b. Upper iron ring; 10c. Lower iron ring; 11. Nut; 12. Membrane; 12a. Inner positioning ring; 12b. Outer positioning ring; 12c. Additional positioning groove; 13. Valve control structure; 14. Limiting retaining spring; 15. Convex ring; 16. Button sleeve; 16a. Sleeve body; 16b. Retaining ring; 17. Over-current closing valve; 18. Manual switch valve; 19. Connecting joint; 20. Lift-limiting retaining spring; 21. Anti-interference gap. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] Embodiment 1

[0044] like Figure 1-Figure 9 As shown, a gas self-closing valve comprises a valve body 1 and a valve core 5, wherein a valve hole 4a is provided in the valve body 1, and a membrane 12, a magnetic component 10 and a valve control structure 13 are provided between the valve body 1 and the valve core 5. The membrane 12 and the valve control structure 13 enable the valve core 5 to suspend at a normal valve opening position to keep the valve hole 4a open, and the valve core 5 can close and keep the valve hole 4a closed by the magnetic component 10 after the valve core 5 moves downward or upward at the normal valve opening position. When the valve core 5 moves downward and the magnetic component 10 closes and keeps the valve hole 4a closed by the valve core 5, the valve core 5 is in an under-pressure valve closing position; when the valve core 5 moves upward and the magnetic component 10 closes and keeps the valve hole 4a closed by the valve core 5, the valve core 5 is in an over-pressure valve closing position.

[0045] like Figure 1-Figure 7As shown, the valve body 1 includes a main body 2 and a cover body 3, and the main body 2 and the cover body 3 are fixedly connected by a threaded structure. A protruding annular connecting ring 2a is provided at the outer edge of the upper end surface of the main body 2, and the lower end of the cover body 3 is inserted into the connecting ring 2a and forms a threaded connection. An air inlet 2b and an air outlet 2c are provided on the main body 2, and a valve seat 4 is fixedly connected inside the main body 2. The valve hole 4a is opened on the valve seat 4, and the air inlet 2b and the air outlet 2c are connected through the valve hole 4a. A protruding positioning boss 4b is provided on the upper end surface of the valve seat 4, and the upper end of the valve hole 4a passes through the upper end surface of the positioning boss 4b. The cover body 3 bulges upward to form a cover top 3a, and a through hole 3a1 is opened on the cover top 3a, and the through hole 3a1 is coaxially arranged with the valve hole 4a. The upper end surface of the cover top 3a is flat, and has a protruding boss 3a2 on the upper end surface of the cover top 3a, and has a protruding positioning platform 3a3 on the lower end surface of the cover top 3a. The upper end of the through hole 3a1 passes through the upper end surface of the boss 3a2, and the lower end of the through hole 3a1 passes through the lower end surface of the positioning platform 3a3.

[0046] The valve core 5 includes a rod-shaped valve stem 6, which includes a valve control section 6a, a fixed section 6b and a connecting section 6c arranged in sequence from bottom to top. The valve control section 6a is inserted into the valve hole 4a and is in clearance with the valve hole 4a. The valve control section 6a can slide up and down in the valve hole 4a. A notch 6a1 is provided on the outer surface of the valve control section 6a. The axial length of the notch 6a1 is greater than the axial length of the valve hole 4a. The bottom surface of the notch 6a1 is a plane. There are two notches 6a1 and they are symmetrically arranged. An upper seal 7 and a lower seal 8 are fixed to the valve control section 6a above and below the notch 6a1. The upper seal 7 can abut against the upper edge of the valve hole 4a and form a seal, and the lower seal 8 can abut against the lower edge of the valve hole 4a and form a seal. The upper seal 7 and the lower seal 8 are made of elastic sealing materials, such as rubber or silicone materials, and the lower seal 8 and the lower seal 8 can be O-rings or flat washers. An upper fixing groove is provided on the outer side of the valve control section 6a above the notch 6a1, and the upper sealing member 7 is fixed in the upper fixing groove, and the outer side of the upper sealing member 7 protrudes from the upper fixing groove. A lower fixing groove is provided on the outer side of the valve control section 6a below the notch 6a1, and the lower sealing member 8 is fixed in the lower fixing groove, and the outer side of the lower sealing member 8 protrudes from the lower fixing groove. A bottom chamfer is provided between the lower end face and the outer side face of the valve stem 6, and the bottom chamfer is located below the lower fixing groove. An upper flared surface 4a1 in the shape of an inverted cone is provided at the upper edge of the valve hole 4a, and the upper sealing member 7 can abut against the upper flared surface 4a1 and form a seal, and a lower flared surface 4a2 in the shape of a cone is provided at the lower edge of the valve hole 4a, and the lower sealing member 8 can abut against the lower flared surface 4a2 and form a seal.

[0047] The magnetic attraction assembly 10 includes a magnet 10a, an upper iron ring 10b and a lower iron ring 10c. The magnet 10a is fixedly connected to the fixed section 6b of the valve stem 6. The upper iron ring 10b is fixed to the cover body 3, and the lower iron ring 10c is fixed to the valve seat 4. The upper iron ring 10b is located above the magnet 10a, and the lower iron ring 10c is located below the magnet 10a. The upper iron ring 10b is sleeved on the outside of the fixed platform and fixed, and the lower iron ring 10c is sleeved on the outside of the fixed boss and fixed. The magnet 10a is sleeved on the fixed section 6b of the valve stem 6 and is fixed by a nut 11. The outer surface of the fixed section 6b has a protruding fixed ring 6b1, and the inner edge of the membrane 12 is pressed and fixed between the fixed ring 6b1 and the magnet 10a. An inner positioning groove 6b2 is provided on the upper end surface of the fixed ring 6b1, and a protruding inner positioning ring 12a is provided on the lower surface of the inner edge of the membrane 12, and the inner positioning ring 12a is embedded in the inner positioning groove 6b2. During installation, the membrane 12 is mounted on the valve stem 6 and abutted against the upper end surface of the fixing ring 6b1, and the inner positioning ring 12a is embedded in the inner positioning groove 6b2, and then the magnet 10a is mounted on the valve stem 6 so that the magnet 10a abuts against the membrane 12, and then the nut 11 is mounted on the valve stem 6 and tightened, so that the inner edge of the membrane 12 and the magnet 10a are pressed between the fixing ring 6b1 and the nut 11 in sequence. The outer edge of the membrane 12 is pressed and fixed between the body 2 and the cover 3, and an outer positioning groove 2d is provided on the upper end surface of the body 2 on the inner side of the connecting ring 2a, and a protruding outer positioning ring 12b is provided on the lower surface of the outer edge of the membrane 12, and the outer positioning ring 12b is embedded in the outer positioning groove 2d. A protruding additional positioning ring 3b is provided on the lower end surface of the cover 3, and a concave additional positioning groove 12c is provided on the upper surface of the outer edge of the membrane 12, and the accessory positioning ring is embedded in the additional positioning groove 12c. In the valve body 1, the membrane 12 and the cover body 3 form an air cavity, the cavity between the membrane 12 and the valve seat 4 is the air inlet cavity, and the cavity between the valve seat 4 and the lower side wall of the body 2 is the air outlet cavity. The air cavity is connected to the outside atmosphere, the air inlet cavity is connected to the air inlet hole 2b, and the air outlet cavity is connected to the air outlet hole 2c.

[0048] The connecting section 6c of the valve stem 6 is inserted into the through hole 3a1. There is an annular gap between the outer side surface of the connecting section 6c and the hole wall surface of the through hole 3a1, and the atmospheric cavity is connected to the outside atmosphere through the annular gap. The upper end of the connecting section 6c extends out of the through hole 3a1 and is fixedly connected with a button 9. The outer side surface of the button 9 is a cylindrical surface, and the upper end surface and the lower end surface of the button 9 are both planes. The upper end of the valve stem 6 is inserted into the button 9 and forms a threaded connection. The button 9 is covered with a button cover 16, which includes a cylindrical cover body 16a, which surrounds the outer side of the button 9, and a retaining ring 16b protruding inwardly is provided on the inner side surface of the lower end of the cover body 16a. The retaining ring 16b is covered outside the convex column 3a2 and forms a radial limit with the convex column 3a2. The upper end of the cover body 16a is tilted outward to form a tapered portion, and the upper end surface of the cover body 16a is a plane or a tapered surface. The button cover 16 can be raised and lowered along the convex column 3a2. A lifting limit spring 20 is fixed on the outer side of the protrusion 3a2, and a spring groove is provided on the outer side of the protrusion 3a2. The lifting limit spring 20 is fixed in the spring groove, and the outer side of the lifting limit spring 20 protrudes from the spring groove. The retaining ring 16b is located below the button 9, and the inner edge of the retaining ring 16b is located directly below the lifting limit spring 20. When the valve core 5 is in the underpressure valve closing position, the button sleeve 16 is lifted upward, and the retaining ring 16b can abut against the lower end surface of the button 9 and drive the button 9 to be lifted synchronously until the inner edge of the retaining ring 16b abuts against the lower end surface of the lifting limit spring 20; when the valve core 5 is suspended in the normal valve opening position, the button sleeve 16 is lifted upward, and the inner edge of the retaining ring 16b can abut against the lower end surface of the lifting limit spring 20. When the button sleeve 16 rises to the retaining ring 16b abuts against the lifting limit spring 20, there is an anti-interference gap 21 between the upper end surface of the retaining ring 16b and the lower end surface of the button 9. After the button cover 16 descends, the lower end surface of the button cover 16 abuts against the upper end surface of the valve body 1, that is, the lower end surface of the cover body 16a abuts against the upper end surface of the cover top 3a. When the lower end surface of the retaining ring 16b is flush with the lower end surface of the cover body 16a, the lower end surface of the retaining ring 16b also abuts against the upper end surface of the cover top 3a. The convex column 3a2 includes a column bottom and an extension portion arranged in sequence from bottom to top. The diameter of the extension portion is smaller than the diameter of the column bottom, and the retaining ring groove is arranged on the upper end of the column bottom. The outer side surface of the column bottom and the inner side surface of the retaining ring 16b can be clearance-fitted, so that the button cover 16 can slide up and down along the convex column 3a2; or there is a gap between the outer side surface of the column bottom and the inner side surface of the retaining ring 16b to prevent the button cover 16 from being stuck on the convex column 3a2.

[0049] The lower end surface of the button 9 is provided with a receiving groove 9a, and the convex column 3a2 can be inserted into the receiving groove 9a. When the valve core 5 is in the underpressure valve closing position and the normal valve opening position, the convex column 3a2 extends into the receiving groove 9a. When the valve core 5 is in the overpressure valve closing position, the column bottom is separated from the receiving groove 9a, and the extension part can be completely separated from the receiving groove 9a, or partially located in the receiving groove 9a. An avoidance recess 9b is provided at the edge of the notch of the receiving groove 9a, and the lifting limit clamping spring 20 can enter the avoiding recess 9b. There is an anti-clamping ring gap between the outer side surface of the limiting clamping spring 20 and the side surface of the avoiding recess 9b. When the valve core 5 is in the underpressure valve closing position, there is an anti-collision gap between the upper end surface of the lifting limit clamping spring 20 and the bottom surface of the avoiding recess 9b. The setting of the avoiding recess 9b, the existence of the anti-clamping ring gap and the anti-collision gap can prevent the lifting limit clamping spring 20 from interfering with the lifting and lowering of the button 9, thereby ensuring the sensitivity of the self-closing valve. The valve control structure 13 includes a limit spring 14 fixed in the receiving groove 9a, and a convex ring 15 corresponding to the limit spring 14 is provided on the outer side of the extension part of the convex column 3a2. When the valve core 5 is suspended in the normal valve opening position, the limit spring 14 elastically abuts against the lower side of the convex ring 15, and when the external force applied to the valve stem 6 is greater than the resistance of the limit spring 14 to the convex ring 15, the limit spring 14 can pass through the convex ring 15. The lower side of the convex ring 15 is in an inverted cone shape, and the upper side of the convex ring 15 is in a cone shape, so that the limit spring 14 can be resisted and the limit spring 14 can pass through the convex ring 15 smoothly when the valve stem 6 is subjected to sufficient external force. The limit spring 14 includes three elastic steel wires, which are uniformly fixed in the receiving groove 9a along the circumferential direction, so that the button 9 is uniformly stressed and the through hole 3a1 is connected with the outside atmosphere. The limiting clamping spring 14 may also be an elastic sheet, and a protruding limiting protrusion is provided on the inner side of the elastic sheet, and the limiting protrusion and the convex ring 15 are of interference fit structure.

[0050] like Figure 1 , Figure 8 and Fig. 9As shown, an over-flow sealing valve is fixed in the air inlet 2b. The structure of the over-flow sealing valve can refer to the patent with application number CN201310289663.5 and authorization announcement number CN103322257B. When the gas flow through the air inlet 2b is too large, the over-flow sealing valve is automatically closed. When the gas flow is restored, the over-flow sealing valve can be automatically opened. A manual switch valve 18 is fixed in the air outlet 2c, which is convenient for users to turn off the gas when they do not use the gas for a long time. A 360° rotatable connection joint 19 is installed on the air outlet end of the manual switch valve 18. The connection joint 19 is used to connect the pressure gauge. The connection joint 19 makes it convenient to connect and measure the pressure of the pressure gauge. The structure of the connection joint 19 can refer to the patent with application number CN200810120670.1 and authorization announcement number CN101354097B. In order to ensure the stable operation of the magnetic attraction component 10, the valve body 1 and the valve stem 6 are made of copper material, the magnet 10a is a permanent magnet, the upper iron ring 10b and the lower iron ring 10c are made of magnetic iron material, the button 9 and the button cover 16 are made of plastic, the button cover 16 is generally set to yellow, and the button 9 is set to red.

[0051] like Figure 1 and Figure 8 As shown, initially, the suction force between the magnet 10a and the lower iron ring 10c causes the upper sealing ring to abut against the upper flared surface 4a1 of the valve hole 4a to form a seal. When normal ventilation is required, air is introduced into the air inlet cavity through the air inlet hole 2b, and then the button sleeve 16 is held and lifted upward. The retaining ring 16b on the button sleeve 16 abuts against the button 9, driving the button 9 and the valve stem 6 to move upward until the inner edge of the retaining ring 16b abuts against the lower end surface of the lifting limit spring 20, and the distance between the magnet 10a and the lower iron ring 10c becomes smaller. At the same time, the upper sealing member 7 is separated from the valve hole 4a, and an air passage is formed between the hole wall of the valve hole 4a and the outer side surface of the valve control section 6a at the notch 6a1. The gas channel connects the air inlet chamber with the air outlet chamber. When the gas pressure is within the normal range, the gas pressure is greater than the suction force between the magnet 10a and the lower iron ring 10c. The gas pressure acts on the membrane 12 to make the limit spring 14 on the button 9 abut against the lower side of the convex ring 15, that is, the valve core 5 is suspended in the normal valve opening position. At this time, the button cover 16 is released, the button cover 16 descends, and the lower end surface of the button cover 16 is abutted against the upper end surface of the cover top 3a. The upper end surface of the button 9 is flush with the upper end of the button cover 16.

[0052] like Figure 8As shown, if the air flow rate in the air inlet 2b is too large, the over-flow closing valve 17 is automatically closed, the air inlet 2b is blocked, the air pressure in the air inlet chamber and the air outlet chamber is reduced, and the gas pressure is reduced to less than the suction force between the magnet 10a and the lower iron ring 10c. Under the action of the suction force between the magnet 10a and the lower iron ring 10c, the valve stem 6 moves downward rapidly to make the upper sealing member 7 abut against the upper flared surface 4a1 to close the valve hole 4a. At this time, the upper end surface of the button 9 is sunk into the button sleeve 16, and the valve core 5 is in the under-pressure valve closing position. When the gas flow returns to normal, the over-flow closing valve 17 automatically opens, and the gas self-closing valve can be opened by lifting the button sleeve 16 again.

[0053] like Figure 8 As shown, if the gas pressure in the air inlet 2b decreases, the air pressure in the air inlet cavity decreases, and the gas pressure decreases to a value less than the suction force between the magnet 10a and the lower iron ring 10c, the valve stem 6 moves downward rapidly under the suction force between the magnet 10a and the lower iron ring 10c, so that the upper sealing member 7 abuts against the upper flared surface 4a1 to close the valve hole 4a, and the upper end surface of the button 9 sinks into the button cover 16, and the valve core 5 is in the under-pressure valve closing position. When the gas pressure returns to normal, the gas self-closing valve can be opened by lifting the button cover 16 again.

[0054] like Fig. 9 As shown, if the gas pressure in the air inlet hole 2b increases, the air pressure in the air inlet chamber rises, and when the gas pressure increases to a level greater than the resistance of the limit spring 14 to the convex ring 15, the limit spring 14 passes upward through the convex ring 15, and under the action of the suction force between the magnet 10a and the upper iron ring 10b, the valve stem 6 moves upward rapidly to make the lower sealing member 8 abut against the lower flared surface 4a2 to close the valve hole 4a. At this time, the upper end surface of the button 9 protrudes from the upper end of the button sleeve 16, and the valve core 5 is in the overpressure valve closing position. When the gas pressure returns to normal, the button 9 is pressed until the upper end surface of the button 9 is flush with the upper end of the button sleeve 16, the limit spring 14 passes downward through the convex ring 15, and the limit spring 14 abuts against the lower side surface of the convex ring 15, and at the same time the lower sealing member 8 is separated from the valve hole 4a, and an air passage is formed between the hole wall surface of the valve hole 4a and the outer side surface of the valve control section 6a at the notch 6a1, the air inlet cavity is connected with the air outlet cavity through the air passage, and the valve core 5 returns to the normal valve opening position.

[0055] When the valve core 5 of the gas self-closing valve is suspended in the normal valve opening position, the gas self-closing valve is in an open state, and the gas can be used normally. At this time, the upper end surface of the button 9 is flush with the upper end of the button sleeve 16. When the valve core 5 deviates from the normal valve opening position and moves upward or downward, the valve core 5 will automatically close the valve hole 4a under the action of the magnetic suction component 10. When the valve core 5 moves downward, the upper end surface of the button 9 sinks into the button sleeve 16, and the valve core 5 is in an under-pressure valve closing position. When the valve core 5 moves upward, the upper end surface of the button 9 protrudes from the upper end of the button sleeve 16, and the valve core 5 is in an over-pressure valve closing position. In this way, the user can easily understand the position of the valve core 5 by observing the relative position of the upper end surface of the button 9 and the upper end of the button sleeve 16, thereby reducing the occurrence of misjudgment and misoperation. Even if a misjudgment is made through observation when the valve core 5 is in the normal valve opening position, since the button 9 is protected in the button cover 16, the user can only touch the upper end surfaces of the button cover 16 and the button 9. At this time, the user can further understand the position of the valve core 5 by touching it. Since the upper end surface of the button cover 16 is flush with the upper end surface of the button 9 when the valve core 5 is in the normal valve opening position, the upper end surface of the button cover 16 will be touched at the same time as the upper end surface of the button 9. In this way, touching will not cause the button 9 to be pulled up or pressed. At this time, the user can understand the real position of the valve core 5 through touch, and touching will not trigger the valve core 5 to move up and down, so that the misjudgment can be corrected, and the self-closing valve will not be further misoperated. Therefore, the gas self-closing valve can reduce the failure of gas to be used normally due to misoperation.

[0056] Moreover, even if the user makes a misjudgment and lifts the button cover 16, the retaining ring 16b will abut against the lift-limiting retaining spring 20 after the button cover 16 is lifted. At this time, there is an anti-interference gap 21 between the retaining ring 16b and the button 9, and the button cover 16 has no effect on the button 9. The button 9 and the valve stem 6 will not move, which can further avoid the gas from being unable to be used normally due to misoperation, making the gas self-closing valve stable to use.

[0057] In order to facilitate the identification of the position of the movable component, the fixed component is usually set as a reference object, but in the present invention, the movable button cover 16 is set as a reference object for the movable valve core 5, breaking the conventional cognition. Although the button cover 16 is movable, the button cover 16 can be axially positioned by the upper end face of the valve body 1, and the button cover 16 can be radially positioned by the outer side face of the protrusion 3a2, so that the button cover 16 can be relatively fixed, and there are no other obstacles outside the button cover 16, so it is easy to see whether the button cover 16 is against the upper end face of the valve body 1, so when identifying the use status of the self-closing valve, it can be identified by the relative position of the button cover 16 and the button 9. In order to ensure the stability of the valve, the relevant parts of the valve core 5 should not be touched when judging the position of the valve core 5, because the touching process can easily cause the position of the valve core 5 to change and affect the opening of the valve. The gas self-closing valve cleverly protects the button 9 and the valve stem 6 through the setting of the button cover 16. Since the upper end surface of the button cover 16 is flush with the upper end of the button 9 when the gas self-closing valve is in normal use, touching the button 9 and the button cover 16 will not cause the button 9 to move up or down. At the same time, the normal valve opening position, the under-pressure valve closing position and the over-pressure valve closing position can be distinguished, which greatly reduces misoperation and ensures the stability of the valve body 1.

[0058] Embodiment 2

[0059] like Fig.10 As shown, the connection structure between the cover body 3 and the body 2 is different from that of the first embodiment, and the other structures are the same as those of the first embodiment. The outer edge of the lower end surface of the cover body 3 has a protruding annular connecting ring 2a, the upper end of the body 2 is inserted into the connecting ring 2a and forms a threaded connection, and the outer edge of the membrane 12 is pressed and fixed between the lower end surface of the cover body 3 and the upper end surface of the body 2.

[0060] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A gas self-closing valve, comprising a valve body (1) and a valve core (5), wherein a valve hole (4a) is provided in the valve body (1), and a membrane (12), a magnetic attraction component (10) and a valve control structure (13) are provided between the valve body (1) and the valve core (5), wherein the valve core (5) can be suspended in a normal valve opening position to keep the valve hole (4a) open by means of the membrane (12) and the valve control structure (13), and after the valve core (5) moves downward or upward at the normal valve opening position, the valve core (5) can close the valve hole (4a) and keep it closed by means of the magnetic attraction component (10), wherein the valve core (5) comprises a valve stem (6), wherein the upper end of the valve stem (6) passes through the valve body (1) and is fixed with a button (9), wherein the valve core (5) comprises a valve rod (6), wherein the upper end of the valve rod (6) passes through the valve body (1) and is fixed with a button (9), wherein the valve core (5) comprises a valve rod (6), wherein the valve rod (6) is provided with a valve rod (9), wherein the valve core (5) is provided with a valve rod (6 ... The button (9) is sheathed with a button cover (16), the lower end surface of the button cover (16) abuts against the upper end surface of the valve body (1), and when the valve core (5) is suspended in the normal valve opening position, the upper end surface of the button (9) is flush with the upper end of the button cover (16), a convex column (3a2) protrudes from the upper end surface of the valve body (1), and a receiving groove (9a) is provided on the lower end surface of the button (9), and when the valve core (5) is suspended in the normal valve opening position, the convex column (3a2) is located in the receiving groove (9a). In the embodiment, the valve control structure (13) includes a limit spring (14) fixed in the receiving groove (9a), and the outer surface of the convex column (3a2) has a convex ring (15) corresponding to the limit spring (14). When the valve core (5) is suspended in a normal valve opening position, the limit spring (14) elastically abuts against the lower side of the convex ring (15), and when the external force applied to the valve stem (6) is greater than the resistance of the limit spring (14) to the convex ring (15), the limit spring (14) can pass through the convex ring (15).

2. The gas self-closing valve according to claim 1, characterized in that: The upper end surface of the button (9) is a plane.

3. The gas self-closing valve according to claim 1, characterized in that: The convex column (3a2) is provided with a through hole (3a1), the valve stem (6) is inserted into the through hole (3a1), the button sleeve (16) comprises a cylindrical sleeve body (16a), the inner side surface of the sleeve body (16a) is provided with a retaining ring (16b) protruding inwards, the retaining ring (16b) is located below the button (9), and the retaining ring (16b) is sleeved outside the convex column (3a2) and forms a radial limit with the convex column (3a2).

4. The gas self-closing valve according to claim 3, characterized in that: The button sleeve (16) can be raised and lowered along the convex column (3a2); a lift-limiting retaining spring (20) is fixed on the outer surface of the convex column (3a2); the retaining ring (16b) is located below the lift-limiting retaining spring (20); and after the button sleeve (16) rises, the retaining ring (16b) can abut against the lift-limiting retaining spring (20); when the valve core (5) is suspended in a normal valve opening position and the button sleeve (16) rises until the retaining ring (16b) abuts against the lift-limiting retaining spring (20), an anti-interference gap (21) is provided between the upper end surface of the retaining ring (16b) and the lower end surface of the button (9).

5. The gas self-closing valve according to any one of claims 1 to 4, characterized in that: The valve stem (6) comprises a valve control section (6a), the valve control section (6a) is inserted into the valve hole (4a) and is in clearance fit with the valve hole (4a), the valve control section (6a) can slide up and down in the valve hole (4a), a notch (6a1) is provided on the outer surface of the valve control section (6a), the axial length of the notch (6a1) is greater than the axial length of the valve hole (4a), an upper sealing member (7) and a lower sealing member (8) are fixed to the valve control section (6a) above and below the notch (6a1), respectively, the upper sealing member (7) can abut against the upper edge of the valve hole (4a) to form a seal, and the lower sealing member (8) can abut against the lower edge of the valve hole (4a) to form a seal.

6. The gas self-closing valve according to claim 5, characterized in that: The upper sealing member (7) and the lower sealing member (8) are both made of elastic material; an upper flared surface (4a1) in the shape of an inverted cone is provided at the upper edge of the valve hole (4a); the upper sealing member (7) can abut against the upper flared surface (4a1) and form a seal; a lower flared surface (4a2) in the shape of a cone is provided at the lower edge of the valve hole (4a); the lower sealing member (8) can abut against the lower flared surface (4a2) and form a seal.

7. The gas self-closing valve according to any one of claims 1 to 4, characterized in that: The magnetic attraction assembly (10) comprises a magnet (10a), an upper iron ring (10b) and a lower iron ring (10c), wherein the magnet (10a) is fixedly connected to the valve stem (6), and the upper iron ring (10b) and the lower iron ring (10c) are fixed to the valve body (1), and the upper iron ring (10b) is located above the magnet (10a), and the lower iron ring (10c) is located below the magnet (10a); the valve stem (6) comprises a fixed section (6b) fixed to the diaphragm (12), and the fixed section (6b) is located above the valve hole (4a). b) has a protruding fixing ring (6b1) on its outer surface, the magnet (10a) is mounted on the fixing section (6b) and fixed, the magnet (10a) is located above the fixing ring (6b1), the inner edge of the membrane (12) is pressed and fixed between the fixing ring (6b1) and the magnet (10a), an inner positioning groove (6b2) is provided on the upper end surface of the fixing ring (6b1), and a protruding inner positioning ring (12a) is provided on the lower surface of the inner edge of the membrane (12), and the inner positioning ring (12a) is embedded in the inner positioning groove (6b2).

8. The gas self-closing valve according to any one of claims 1 to 4, characterized in that: The valve body (1) comprises a main body (2) and a cover body (3); the outer edge of the membrane (12) is pressed between the upper end surface of the main body (2) and the lower end surface of the cover body (3); the upper end surface of the main body (2) is provided with an annular connecting ring (2a) located on the outer side of the membrane (12); the lower end of the cover body (3) is inserted into the connecting ring (2a) to form a threaded connection; or the lower end surface of the cover body (3) is provided with an annular connecting ring (2a) located on the outer side of the membrane (12); the upper end of the main body (2) is inserted into the connecting ring (2a) to form a threaded connection.

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