Self-closing gas valve

Abstract

A self-closing gas valve, comprising a valve body (1) and a valve cover (2) connected to the valve body (1), a cavity (3) being provided between the valve body (1) and the valve cover (2), a lower portion of the valve body being provided with an air inlet channel (4) and an air outlet channel (5), an air hole (6) being provided between the cavity (3) and the air inlet channel (4), the cavity (3) being communicated with the air outlet channel (5), a valve rod assembly (7) being disposed within the cavity (3) in the valve body (1), a diaphragm (8) being disposed on the circumferential side of the valve rod assembly (7) in the valve body (1), the valve rod assembly (7) comprising a lower valve rod (9), the lower valve rod (9) sealing the air hole (6), a guide member (10) being disposed within the cavity (3) in the valve body (1), a lower valve rod hole (11) being provided on the guide member (10), the guide member (10) being connected to the lower valve rod (9) by means of the lower valve rod hole (11), and the guide member (10) being at least partially in contact with the diaphragm (8). The self-closing valve has a simplified internal structure, and increases the convenience of part production and the assembly of self-closing gas valves.

Description

A gas self-closing valve Technical Field

[0001] The present invention relates to the field of self-closing valve technology, and more particularly to the field of self-closing valve technology. Background Art

[0002] Gas has become the most widely used gas fuel in modern households. However, it has negative characteristics such as flammability, explosion, and toxicity. Improper management can easily lead to major safety accidents. Therefore, it is necessary to ensure that the gas entering the gas appliance maintains a normal pressure to ensure sufficient and stable combustion. Gas self-closing valves automatically close when overpressure or underpressure occurs, preventing gas leakage. As a key component in controlling the flow and flow of the medium, the diaphragm must ensure its stability.

[0003] The authorization announcement number of the prior art is CN210218822U, which includes a valve body and a valve cover, and a valve cavity is provided between the valve body and the valve cover; a diaphragm is provided in the valve cavity and the diaphragm divides the valve cavity into an upper cavity and a lower cavity, and an air inlet cavity and an air outlet cavity are provided on both sides of the valve body, a valve stem assembly is provided in the upper cavity, and a flow regulating device is provided in the lower cavity, the bottom end of the valve stem assembly extends into the lower cavity and is connected with the flow regulating device, the flow regulating device includes a floating sealing plug, an adjusting screw disk and an adjusting base ring, the adjusting base ring is opened at the inner cavity opening of the air inlet cavity and is also provided with a flow regulating hole, and the bottom end of the floating sealing plug is in contact with the inner cavity opening of the air inlet cavity.

[0004] The existing technology lacks a structure that can further stabilize the diaphragm, and the connection between the valve body and the diaphragm is relatively complex, which increases the difficulty of production. On the basis of ensuring the safety of the gas self-closing valve, in order to simplify the internal structure of the gas self-closing valve and increase the convenience of parts production and gas self-closing valve assembly, we propose a gas self-closing valve.

[0005] Utility Model Content

[0006] In order to simplify the internal structure of the gas self-closing valve and increase the convenience of parts production and gas self-closing valve assembly, the present application provides a gas self-closing valve.

[0007] The present application provides a gas self-closing valve adopting the following technical solution:

[0008] A gas self-closing valve comprises a valve body and a valve cover connected to the valve body, a cavity is provided between the valve body and the valve cover, an air inlet channel and an air outlet channel are respectively provided at the lower portion of the valve body, an air hole is provided between the cavity and the air inlet channel, the cavity is communicated with the air outlet channel, a valve stem assembly is provided in the cavity, a diaphragm is provided on the circumference of the valve stem assembly, the valve stem assembly comprises a lower valve stem, the lower valve stem seals the air port, the valve body is provided with a guide member in the cavity, a valve stem hole is provided on the guide member, the guide member is connected to the lower valve stem through the valve stem hole, and the guide member is at least partially in contact with the diaphragm.

[0009] By adopting the above technical solution, the guide member limits the radial position of the lower valve stem, and the lower valve stem seals or unseals the air hole through axial movement. The guide member and the lower valve stem sealing air hole are both simple structures. On the one hand, the guide member limits the radial position of the lower valve stem, and on the other hand, the guide member supports the diaphragm through contact with the diaphragm, so that the position of the diaphragm is more stable. The guide member has a simple structure, which increases the convenience of demoulding the guide member production and also increases the convenience of assembling the gas self-closing valve.

[0010] Preferably, the guide member is glued with a guide tube on the peripheral side of the lower valve stem hole.

[0011] By adopting the above technical solution, the guide tube assists the lower valve stem hole to further stabilize the position of the lower valve stem, thereby increasing the stability of the overall radial position of the lower valve stem.

[0012] Preferably, the guide member is tray-shaped, and the edge of the guide member supports the diaphragm.

[0013] By adopting the above technical solution, the tray-like shape is simple and easy to produce, and the edge of the guide member supports the diaphragm, further increasing the stability of the diaphragm position.

[0014] Preferably, through holes are evenly formed on the guide member.

[0015] By adopting the above technical solution, the through holes are conducive to stabilizing the pressure difference on both sides of the guide member, and evenly arranging the through holes facilitates stabilizing the airflow difference on both sides of the guide member.

[0016] Preferably, a sealing ring is provided between the diaphragm and the valve stem assembly.

[0017] By adopting the above technical solution, the diaphragm takes on the sealing task, and the sealing ring strengthens the sealing effect between the diaphragm and the valve stem assembly.

[0018] Preferably, a stepped groove is provided on the upper side of the valve body, and the stepped groove includes an upper step groove and a lower step groove, the lower step groove is located below the axial direction of the upper step groove, the guide member is placed in the lower step groove, the height of the guide member is greater than the groove depth of the lower step groove, the diaphragm is placed in the upper step groove, and the edge of the diaphragm is in a horizontal "L" shape to fill the remaining upper step groove, the upper side of the diaphragm is flush with the upper side of the valve body, and the valve cover is arranged on the upper side of the valve body and the upper side of the diaphragm.

[0019] By adopting the above technical solution, the user can install the diaphragm and the guide in the stepped groove by opening the valve cover. The stepped groove limits the installation position of the diaphragm and the guide. The diaphragm is in a horizontal "L" shape and is hooked with the guide to further limit the radial position of the two. The valve cover squeezes the upper side of the diaphragm to increase the tightness of the axial connection between the diaphragm and the guide.

[0020] Preferably, the lower end of the lower valve stem is sleeved with a sealing sleeve having elastic properties.

[0021] By adopting the above technical solution, the sealing sleeve elastically deforms to fill the air hole, thereby increasing the sealing effect of the lower valve stem sealing air hole.

[0022] Preferably, the valve body is provided with a sealing protrusion around the air hole.

[0023] By adopting the above technical solution, the sealing dome and the sealing sleeve form a cross seal, thereby achieving a better sealing effect.

[0024] Preferably, the maximum deformation depth of the sealing sleeve is greater than the height of the sealing protrusion.

[0025] By adopting the above technical solution, the material of the sealing sleeve is limited, and it is ensured that the sealing protrusion and the sealing sleeve can form a cross seal.

[0026] Preferably, an overflow valve is provided inside the air inlet passage, and a ball valve is provided inside the air outlet passage.

[0027] By adopting the above technical solution, the over-flow valve realizes the over-flow safety protection of the gas self-closing valve, and the ball valve facilitates cutting off the flow of gas, reducing the degree of disasters such as fire.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The guide member limits the radial position of the lower valve stem, and the lower valve stem seals or unseals the air hole through axial movement. The guide member and the lower valve stem sealing air hole are both simple structures. On the one hand, the guide member limits the radial position of the lower valve stem, and on the other hand, the guide member supports the diaphragm through contact with the diaphragm, making the position of the diaphragm more stable. The simple structure of the guide member increases the convenience of demoulding during production of the guide member and also increases the convenience of assembling the gas self-closing valve;

[0030] 2. The stepped groove limits the installation position of the diaphragm and the guide. The diaphragm is in a horizontal "L" shape and is hooked with the guide to further limit the radial position of the two. The valve cover squeezes the upper side of the diaphragm to increase the tightness of the axial connection between the diaphragm and the guide.

[0031] 3. The sealing dome and the sealing sleeve form a cross seal to achieve a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] FIG1 is a schematic structural diagram of a gas self-closing valve in this embodiment;

[0033] FIG2 is a cross-sectional view of the gas self-closing valve in this embodiment;

[0034] FIG3 is a cross-sectional view of the guide member in this embodiment.

[0035] Figure markings: 1. valve body; 2. valve cover; 3. cavity; 4. air inlet channel; 5. air outlet channel; 6. air hole; 7. valve stem assembly; 8. diaphragm; 9. lower valve stem; 10. guide member; 11. lower valve stem hole; 12. guide tube; 13. through hole; 14. sealing ring; 15. stepped groove; 16. upper step groove; 17. lower step groove; 18. sealing sleeve; 19. sealing protrusion; 20. overflow valve; 21. ball valve; 22. sealing hoop; 23. upper valve stem; 24. button; 25. ball valve knob. DETAILED DESCRIPTION

[0036] The present application is further described in detail below with reference to Figures 1-2.

[0037] The embodiment of the present application discloses a gas self-closing valve.

[0038] Referring to Figures 1 and 2, the valve body 1 includes a valve body 1 and a valve cover 2 connected to the valve body 1, a cavity 3 is opened between the valve body 1 and the valve cover 2, the valve body 1 is provided with a valve stem assembly 7 in the cavity 3, the valve body 1 is provided with an air inlet channel 4 at the lower left of the cavity 3, the valve body 1 is provided with an air outlet channel 5 at the lower right of the cavity 3, an air hole 6 is opened between the cavity 3 and the air inlet channel 4, the cavity 3 is communicated with the air outlet channel 5, the gas enters the gas self-closing valve through the air inlet channel 4, and enters the cavity 3 through the air hole 6, and then because the cavity 3 and the air outlet channel 5 are integrally connected, the gas passes through the cavity 3 and flows into the air outlet channel 5, and then leaves the gas self-closing valve.

[0039] A stepped groove 15 is provided on the upper side of the valve body 1, and the stepped groove 15 includes an upper stepped groove 16 and a lower stepped groove 17. The lower stepped groove 17 is located below the axial direction of the upper stepped groove 16. A guide member 10 is placed inside the lower stepped groove 17. The guide member 10 is roughly tray-shaped as a whole. The guide member 10 has a simple structure and is convenient for demolding and installation. A through hole 13 is provided on the guide member 10 to facilitate adjustment of the air pressure around the guide member 10 to ensure the normal sealing of the lower valve stem 9. The through holes 13 are evenly distributed on the surface of the guide member 10 to stabilize the pressure difference and airflow difference on both sides of the guide member 10.

[0040] The height of the guide 10 is greater than the depth of the lower step groove 17. The valve body 1 places the diaphragm 8 in the upper step groove 16 of the stepped groove 15. The lower side of the edge of the diaphragm 8 has a protrusion, so that the edge of the diaphragm 8 is in a horizontal "L" shape. The diaphragm 8 fills the remaining upper step groove 16 after being partially occupied by the guide 10. The guide member 10 limits the radial movement of the diaphragm 8. Similarly, the diaphragm 8 also limits the axial movement of the guide member 10, that is, it increases the stability of the joint installation of the two, and the edge of the guide member 10 supports the diaphragm 8. The wire member provides support force to the diaphragm 8 below the diaphragm 8, increasing the stability of the position of the diaphragm 8. The upper side of the diaphragm 8 is flush with the upper side of the valve body 1, and the valve cover 2 is bolted to the upper side of the valve body 1 and the upper side of the diaphragm 8. The valve cover 2 squeezes the diaphragm 8 to make the contact between the diaphragm 8 and the guide member 10 closer. The valve cover 2 limits the axial movement of the diaphragm 8, and the outer side wall of the valve body 1 and the outer side wall of the valve cover 2 are sleeved with a sealing hoop 22. The sealing hoop 22 strengthens the stable connection between the valve body 1 and the valve cover 2. The sealing hoop 22 further seals the connection between the valve body 1 and the valve cover 2 to prevent external water vapor or other substances from entering the gas self-closing valve and damaging the normal use of the gas self-closing valve.

[0041] The valve stem assembly 7 includes an upper valve stem 23 and a lower valve stem 9. The upper end of the upper valve stem 23 is inserted through the valve cover 2 and is connected to the button 24. The lower end of the upper valve stem 23 is connected to the lower valve stem 9 through the diaphragm 8. The upper valve stem 23 and the diaphragm 8 are sealed. The upper valve stem 23 and the lower valve stem 9 are electromagnetically connected between the diaphragm 8 and the guide plate. The diaphragm 8 is provided with a sealing ring 14 on the peripheral side connected to the upper valve stem 23. The sealing ring 14 strengthens the sealing effect between the diaphragm 8 and the upper valve stem 23. The upper end of the lower valve stem 9 is electromagnetically connected to the upper end of the upper valve stem 23. The lower end of the lower valve stem 9 is inserted through the lower valve stem hole 11 of the guide 10 and abuts against the air hole 6. The lower end of the lower valve stem 9 is sleeved with a sealing sleeve 18. The sealing sleeve 18 is made of elastic material, so the sealing sleeve 18 follows the lower valve stem 9 downward. After being squeezed, the sealing sleeve 18 is deformed and fills the air hole 6, thereby sealing the air hole 6.

[0042] The interior of the air inlet channel 4 is provided with an overflow valve 20, which includes an overflow shell, a filter plate and a sealing plate. The overflow shell is inserted into the interior of the air inlet channel 4, and a fixing rod is welded at one end of the overflow shell close to the air outlet channel 5. The fixing rod is welded with a fixing ring at the core of the overflow shell. The fixing ring is sleeved with a spring at one end away from the air outlet channel 5. The sealing plate is welded to the other end of the spring. A positioning rod is welded through the middle of the sealing plate. One end of the positioning rod is inserted into the interior of the fixing ring. A limiting countersunk hole is opened in the middle of the filter plate, and the other end of the positioning rod is inserted into the inner wall of the fixing ring. The inlet is connected in the limiting countersunk hole. When the overflow gas flows into the air inlet channel 4, the gas impacts the sealing plate. The sealing plate compresses the spring to seal the end of the overflow shell. The positioning stick moves left and right with the sealing plate between the fixing ring and the limiting countersunk hole. The overflow valve 20 realizes the overflow safety protection of the gas self-closing valve. The ball valve 21 is inserted into the air outlet channel 5 and connected. The ball valve knob 25 is inserted into the surface of the air outlet channel 5 and connected. The user blocks or opens the air outlet channel 5 through the ball valve knob 25. The ball valve 21 is convenient for cutting off the flow of gas and reducing the degree of disasters such as fire.

[0043] Furthermore, in this embodiment, the valve body 1 has a sealing protrusion 19 around the upper side of the air hole 6. In the process of the lower valve stem 9 sealing the air hole 6, the sealing protrusion 19 and the lower side of the cavity 3 cause the sealing sleeve 18 to deform, and the sealing protrusion 19 and the sealing sleeve 18 form a cross seal to form a better sealing effect. The diameter of the sealing sleeve 18 is greater than the diameter of the sealing protrusion 19, and the maximum deformation depth of the sealing sleeve 18 is greater than the height of the sealing protrusion 19, thereby ensuring that the sealing protrusion 19 and the sealing sleeve 18 can form a cross seal.

[0044] Furthermore, in this embodiment, the side walls of the cavity 3 are smooth and have no sharp corners. The smooth side walls reduce structural stagnation during the flow of air, ensure the freshness of the gas, and thus allow the gas self-closing valve to flow smoothly at all times.

[0045] Furthermore, in this embodiment, referring to Figure 3, the guide member 10 is glued with a guide tube 12 at the lower end of the lower valve stem hole 11. The lower valve stem 9 also passes through the guide tube 12 when passing through the lower valve stem hole 11. The guide tube 12 assists the lower valve stem hole 11 to further stabilize the position of the lower valve stem 9, thereby increasing the stability of the overall radial position of the lower valve stem 9.

[0046] The implementation principle of a gas self-closing valve disclosed in the embodiment of the present application is: when the gas pressure is high, the diaphragm 8 deforms upward, and when the gas pressure is insufficient, the diaphragm 8 returns to its original shape. The deformation of the diaphragm 8 reflects the opening and closing state of the gas self-closing valve, so the stability of the diaphragm 8 is very important for the self-closing valve. In order to enhance the stability of the diaphragm 8, a guide member 10 is provided under the diaphragm 8. The guide member 10 further assists in the stability of the position of the diaphragm 8. During use, when the self-closing valve is not in use and is closed, the diaphragm 8 is not deformed, the upper valve stem 23 and the lower valve stem 9 are attracted to each other, and the lower valve stem 9 seals the air hole 6; the self-closing valve is opened When in use, the upper valve stem 23 and the lower valve stem 9 are in the attracted state, the lower valve stem 9 unseals the air hole 6, and the gas passes through the air inlet channel 4 to the cavity 3 and then to the air outlet channel 5; when the gas overflows the diaphragm 8, the overflow valve 20 plays the role of overflow safety protection, the flowing gas flows into the air inlet channel 4, the gas impacts the sealing plate, the sealing plate compresses the spring to seal the end of the overflow shell, and the positioning rod moves left and right with the sealing plate between the fixing ring and the limiting counterbore. When the gas is underpressured, the diaphragm 8 returns to its original non-deformed state, the upper valve stem 23 and the lower valve stem 9 are attracted, and the lower valve stem 9 seals the air hole 6, thereby making the entire gas self-closing valve in a safe state.

[0047] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A gas self-closing valve, comprising a valve body (1) and a valve cover (2) connected to the valve body (1), a cavity (3) being provided between the valve body (1) and the valve cover (2), an air inlet channel (4) and an air outlet channel (5) being provided at the lower part of the valve body (1), an air hole (6) being provided between the cavity (3) and the air inlet channel (4), the cavity (3) being communicated with the air outlet channel (5), the valve body (1) being provided with a valve stem assembly (7) in the cavity (3), the valve body (1) being provided with a diaphragm (8) on the peripheral side of the valve stem assembly (7), the valve stem assembly (7) comprising a lower valve stem (9), the lower valve stem (9) sealing the air hole (6), characterized in that: The valve body (1) is provided with a guide member (10) in the cavity (3), and a lower valve stem hole (11) is opened on the guide member (10). The guide member (10) is connected to the lower valve stem (9) through the lower valve stem hole (11), and the guide member (10) is at least partially in contact with the diaphragm (8).

2. The gas self-closing valve according to claim 1, characterized in that: The guide member (10) is glued with a guide tube (12) on the peripheral side of the lower valve stem hole (11).

3. The gas self-closing valve according to claim 1, characterized in that: The guide member (10) is in the shape of a tray, and the edge of the guide member (10) supports the membrane (8).

4. The gas self-closing valve according to claim 1, characterized in that: The guide member (10) is evenly provided with through holes (13).

5. The gas self-closing valve according to claim 1, characterized in that: A sealing ring (14) is provided between the diaphragm (8) and the valve stem assembly (7).

6. The gas self-closing valve according to claim 1, characterized in that: A stepped groove (15) is provided on the upper side of the valve body (1), and the stepped groove (15) includes an upper stepped groove (16) and a lower stepped groove (17). The lower stepped groove (17) is located below the axial direction of the upper stepped groove (16). The guide member (10) is placed in the lower stepped groove (17). The height of the guide member (10) is greater than the groove depth of the lower stepped groove (17). The diaphragm (8) is placed in the upper stepped groove (16), and the edge of the diaphragm (8) is in a horizontal "L" shape to fill the remaining upper stepped groove (16). The upper side of the diaphragm (8) is flush with the upper side of the valve body (1). The valve cover (2) is arranged on the upper side of the valve body (1) and the upper side of the diaphragm (8).

7. The gas self-closing valve according to claim 1, characterized in that: The lower end of the lower valve stem (9) is sleeved with a sealing sleeve (18) having elastic properties.

8. The gas self-closing valve according to claim 7, characterized in that: The valve body (1) is provided with a sealing protrusion (19) around the air hole (6).

9. The gas self-closing valve according to claim 8, characterized in that: The maximum deformation depth of the sealing sleeve (18) is greater than the height of the sealing protrusion (19).

10. The gas self-closing valve according to claim 1, characterized in that: An overflow valve (20) is provided inside the air inlet passage (4), and a ball valve (21) is provided inside the air outlet passage (5).

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