Gas overflow valve sealing structure and gas overflow valve

Abstract

The sealing structure comprises a rubber valve element and a valve seat, the valve element comprises a sealing part and an overflowing part from top to bottom, the sealing part is in a bowl shape with the closed bottom end, the overflowing part is in an inverted cup shape, and an overflowing opening penetrating through the inside and the outside is formed in the side wall of the overflowing part; the bottom end of the valve element is provided with an annular valve element bottom edge extending outwards in the radial direction, the valve seat is annular and provided with an overflowing hole, the overflowing hole comprises an aperture gradually-shrinking section and an aperture equal-diameter section from top to bottom, the bottom end of the valve seat is provided with a valve seat bottom edge extending outwards in the radial direction, the valve element is coaxially located in the valve seat, and the valve element bottom edge abuts against the bottom wall of the valve seat from bottom to top. The sealing part is located above the hole diameter equal-diameter section, and a gap is reserved between the outer wall of the sealing part and the hole wall of the hole diameter gradually-shrinking section. The gas overflow valve adopts the sealing structure to adjust the flow of the valve. The medium flow of the valve can be automatically adjusted according to the pressure difference between the two sides of the sealing structure, and the valve can be automatically closed when the pressure difference is too large.

Description

Technical Field

[0001] The invention relates to a gas overflow valve sealing structure and a gas overflow valve adopting the sealing structure, belonging to the technical field of valves. Background Art

[0002] The gas valve (or gas shut-off valve) is a safety device for gas pipeline engineering. When the combustible gas leaks, the valve is automatically and quickly closed to cut off the gas supply and prevent the occurrence of a serious accident in time. There are many types of gas valves in the prior art. For example, the utility model patent with the publication number CN222085153U discloses a self-sealing gas valve, including an outer sleeve and an air core tube with a sleeve arranged at the upper end of the outer sleeve. The outer sleeve and the air core tube are provided with a valve core assembly, and the bottom end sleeve of the outer sleeve is provided with a positioning member that cooperates with the valve core assembly; the valve core assembly includes an iron core, and a sealing piston plate is provided on the iron core at the bottom end of the air core tube; the outer sleeve has an air inlet on one side and an air outlet on the other side, and the air outlet is below the air inlet. The air core tube includes an air chamber formed by two side shells, and the air inlet is connected to the air chamber. The sealing piston plate moves downward to connect the air chamber with the air outlet. The self-sealing gas valve has high sealing performance, control accuracy, structural stability, convenient operation and safety. It can quickly cut off the flow of gas, prevent gas leakage and accidents, and greatly improve the safety of use. For another example, the invention patent application with publication number CN116697110A discloses an electromagnetic gas emergency shut-off valve with a pressure regulating function, including a valve body, a valve assembly for opening or closing a gas source channel is arranged in the middle of the valve body, a pressure regulating assembly is arranged above the valve assembly, a wireless transmission assembly for transmitting and receiving line number instructions is arranged at the lower end of the valve body, and an electromagnetic gas emergency shut-off valve assembly and a sensing function assembly are arranged on the right side of the valve body; the electromagnetic gas emergency shut-off valve is composed of structures with main functions such as shut-off, pressure regulating, wireless transmission and sensing, and the valve assembly is arranged to cooperate with the pressure regulating assembly to achieve gas flow regulation, and the use of intelligent management and control, combined with the combustible gas alarm of the gas network joint control, can realize the Internet of Things joint control, and the gas source is immediately cut off when leaking; the defect that the gas cannot be automatically closed when the gas leaks or abnormal conditions occur during ventilation is solved, and the safety hazards of poisoning, fire and explosion caused by gas leakage are avoided. The above technologies have their own characteristics and are respectively suitable for various adaptive occasions. However, the internal structures of the above valves are relatively complex, and the valve cut-off is controlled by electromagnetic control, which requires the installation of corresponding control components, which is prone to operational errors. When there is a power outage in the use environment, the valve function is prone to failure, and the electronic control itself has safety hazards in the application of the gas system. In addition, since the internal parts of the valve are mostly non-metallic materials, when a fire occurs at the gas use terminal, it is very easy to burn through the inside of the valve through the gas pipeline, causing the flame to enter the gas supply system (flashback), causing a greater safety accident. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a gas overflow valve sealing structure and a gas overflow valve, which can not only automatically adjust the medium flow of the valve, but also automatically close the valve when the pressure difference at both ends of the valve is too large.

[0004] The technical scheme for achieving the above-mentioned purpose of the present invention is: a gas overflow valve sealing structure, comprising a rubber valve core and a valve seat, the valve core comprising a sealing part and a flow portion from top to bottom, the sealing part is in the shape of a bowl with a closed bottom end, the flow portion is in the shape of an inverted cup (or trumpet), and a flow port penetrating inside and outside is arranged on its side wall, the bottom end of the valve core is provided with an annular valve core bottom edge extending radially outward, the valve seat is annular, and is provided with a flow hole, the flow hole comprises a gradually reducing aperture section and a uniform aperture section from top to bottom, the bottom end of the valve seat is provided with a valve seat bottom edge extending radially outward, the outer edge diameter of the valve core bottom edge is smaller than the outer edge diameter of the valve seat bottom edge and larger than the aperture of the uniform aperture section, the valve core is coaxially located in the valve seat, the valve core bottom edge abuts against the bottom wall of the valve seat from bottom to top, the sealing part is located above the uniform aperture section, and a spacing is left between the outer wall of the sealing part and the aperture wall of the gradually reducing aperture section.

[0005] Preferably, the outer wall surface of the sealing portion and the hole wall surface of the aperture tapering section are both inverted cone surfaces, the outer wall of the sealing portion is parallel to the hole wall of the aperture tapering section, or the distance between the outer wall of the sealing portion and the hole wall of the aperture tapering section gradually increases from top to bottom.

[0006] Preferably, the flow-through portion is located in the hole-diameter section, and a distance is left between the outer wall of the flow-through portion and the hole wall of the hole-diameter section.

[0007] Preferably, the area of ​​the flow opening is not less than 1 / 4 of the area of ​​the side wall of the flow portion, and not more than 1 / 2 of the area of ​​the side wall of the flow portion.

[0008] Preferably, the flow port is provided with a vertical support rib, the top end of the support rib is connected to the outer edge of the bottom wall of the sealing portion, and the bottom end is connected to the inner edge of the bottom edge of the valve core.

[0009] The number of the support ribs may be one or more. When the number of the support ribs is more than one, the support ribs are evenly distributed in the flow opening along the circumference of the flow portion.

[0010] The supporting rib and the flow-through portion may be an integral structure and made of the same material.

[0011] Preferably, an annular groove conforming to the bottom edge of the valve core is provided on the bottom wall of the valve seat, the annular groove is opened from bottom to top, the depth (or height) of the annular groove corresponds to the thickness (or height) of the bottom edge of the valve core, and the bottom edge of the valve core is embedded in the annular groove.

[0012] Preferably, a positioning column extending vertically downward is provided on the bottom surface of the valve seat, a positioning hole matching with the positioning column is provided on the bottom edge of the valve core, and the positioning column is inserted into the positioning hole.

[0013] Preferably, there are a plurality of positioning posts, and the plurality of positioning posts are evenly distributed along the circumference of the bottom surface of the valve seat.

[0014] Preferably, the positioning hole is a through hole.

[0015] Preferably, the outer diameter of the top end of the sealing portion is smaller than the outer diameter of the top end of the valve seat.

[0016] Preferably, the top of the sealing portion is provided with an annular valve core top edge extending radially outward, and the outer edge diameter (or outer diameter) of the valve core top edge is larger than the inner diameter of the top of the valve seat and smaller than the outer diameter of the top of the valve seat.

[0017] A gas overflow valve has a valve sealing structure coaxially arranged in its medium flow channel, the valve sealing structure adopts any one of the gas overflow valve sealing structures disclosed in the present invention, the sealing portion faces the inlet direction side of the medium flow channel, and the valve seat faces the outlet direction side of the medium flow channel.

[0018] Preferably, an annular fireproof thermal expansion ring is provided in the medium flow channel, and the fireproof thermal expansion ring is located on the outlet direction side of the medium flow channel of the gas overflow valve sealing structure.

[0019] Preferably, the fireproof heat expansion ring is made of heat expansion material, and the heat expansion material can be a heat expansion material under the existing technology such as polyurethane or polystyrene.

[0020] Preferably, the gas overflow valve includes a valve body and a valve cover, the valve body and the valve cover are both in the shape of a vertical reducer, the diameter of the upper pipe section of the valve body (including inner diameter and outer diameter, the same below) is larger than the diameter of the lower pipe section, the diameter of the upper pipe section of the valve cover (including inner diameter and outer diameter, the same below) is smaller than the diameter of the lower pipe section, the valve cover is coaxially threaded with the valve body, the valve cover is located above the valve body, the bottom end of the valve cover is located in the upper pipe section of the valve body, the pipe hole of the upper pipe section of the valve body and the pipe hole of the lower pipe section of the valve cover constitute a valve cavity, the gas overflow valve sealing structure and the fireproof thermal expansion ring are both located in the valve cavity, the fireproof thermal expansion ring is arranged on the reducer table in the valve cover, the gas overflow valve sealing structure is arranged on the top surface of the fireproof thermal expansion ring, and the bottom end of the valve cover is against the bottom edge of the valve seat from top to bottom.

[0021] Preferably, a distance is left between the top outer edge of the sealing portion (referring to the outer edge of the top edge of the valve core) and the cavity wall of the valve cavity.

[0022] Preferably, the pipe hole of the valve body includes a wide diameter section, a variable diameter section and a narrow diameter section from top to bottom, the pipe diameter of the variable diameter section gradually shrinks from top to bottom, the top pipe diameter of the variable diameter section is the same as the pipe diameter of the wide diameter section, and the bottom pipe diameter of the variable diameter section is the same as the pipe diameter of the narrow diameter section; the pipe hole of the valve cover includes a narrow diameter section, a variable diameter section and a wide diameter section from top to bottom, the pipe diameter of the variable diameter section gradually expands from top to bottom, the top pipe diameter of the variable diameter section is the same as the pipe diameter of the narrow diameter section, and the bottom pipe diameter of the variable diameter section is the same as the pipe diameter of the wide diameter section.

[0023] Preferably, the outer diameter of the fireproof thermal expansion ring corresponds to the diameter of the wide diameter section of the pipe hole of the valve body, the inner diameter of the fireproof thermal expansion ring is larger than the inner diameter of the bottom end of the valve seat, and the outer edge diameter of the bottom edge of the valve seat corresponds to the diameter of the wide diameter section of the pipe hole of the valve body.

[0024] Preferably, the main body of the valve seat (the portion except the bottom edge of the valve seat) is located in the wide diameter section of the pipe hole of the valve cover.

[0025] Preferably, a distance is left between the outer edge of the top edge of the valve core and the tube wall of the tube hole of the valve cover (the tube wall of the wide diameter section and / or the tube wall of the reduced diameter section of the tube hole of the valve cover).

[0026] The distance between the outer edge of the top edge of the valve core and the tube wall of the tube hole of the valve cover, the distance between the outer wall of the valve core and the hole wall of the flow hole (including the distance between the outer wall of the sealing part and the hole wall of the hole diameter tapering section of the flow hole and the distance between the outer wall of the flow part and the hole wall of the hole diameter equal section of the flow hole), the flow port and the internal space of the flow part constitute a flow channel for the medium, connecting the medium flow channels on the upper and lower sides of the gas overflow valve sealing structure.

[0027] Preferably, an annular gasket is provided between the fireproof thermal expansion ring and the valve seat, the outer diameter of the gasket corresponds to the diameter of the wide diameter section of the pipe hole of the valve body, and the inner diameter of the gasket corresponds to the inner diameter of the fireproof thermal expansion ring.

[0028] The washer may be an aluminum washer.

[0029] The beneficial effect of the present invention is that: due to the unique structural design of the gas overflow valve sealing structure, when the pressure difference on both sides of the gas overflow valve sealing structure exceeds a preset threshold value (or the flow exceeds a preset threshold value), under the action of the medium pressure, the flow portion undergoes elastic deformation, and the sealing portion can be quickly pressed down and tilted in the direction of the flow port, thereby reducing the area of ​​the flow port and the distance between the outer wall of the valve core and the hole wall of the flow hole of the valve seat (reducing the flow area of ​​the gas overflow valve sealing structure), and even the outer wall of the sealing portion is pressed tightly against the inner wall of the valve seat or the flow port is closed, thereby quickly adjusting the medium flow of the valve, avoiding danger caused by the pressure difference on both sides of the gas overflow valve sealing structure or excessive rear end flow, and when the pressure difference on both sides of the gas overflow valve sealing structure returns to within the preset threshold range (or the flow returns to within the preset threshold range), the flow portion returns to its original state through its own elasticity. The shape of the valve is restored accordingly; when the gas system or pipeline at the rear end of the gas overflow valve sealing structure leaks, the outlet side pressure of the gas overflow valve sealing structure will drop rapidly, and then the pressure difference on both sides of the gas overflow valve sealing structure will increase rapidly. Under the action of the medium pressure, the flow portion rapidly undergoes a large elastic deformation, and the sealing portion moves downward and is pressed tightly against the inner wall of the valve seat to close the flow channel, which can quickly and effectively prevent the medium from continuing to leak, thereby eliminating subsequent safety hazards and avoiding waste of resources; when a fire occurs in the gas system, pipeline or user end at the rear end of the gas overflow valve sealing structure, the fireproof thermal expansion ring expands rapidly due to heat, blocks the medium flow channel and can fill the holes formed by ablation of nearby non-metallic parts, thereby blocking the flame, which can effectively prevent the flame from entering the gas supply system (flashback), ensure the safety of the gas supply system, and avoid causing greater safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a cross-sectional view of an embodiment of the gas overflow valve sealing structure of the present invention; Figure 2 yes Figure 1 A schematic structural diagram of the valve core in an embodiment; Figure 3 yes Figure 1 A schematic structural diagram of the valve seat in an embodiment; Figure 4It is a cross-sectional view of an embodiment of the gas overflow valve of the present invention. DETAILED DESCRIPTION

[0031] All directional indications (such as up, down, top, bottom, inside, outside, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings), and do not constitute a limitation on the actual use direction. If the specific posture changes, the directional indication will also change accordingly.

[0032] See also Figure 1-Figure 3 The present invention discloses a gas overflow valve sealing structure, which is used in a gas overflow valve and plays the role of regulating flow and closing a medium flow channel. The structure comprises a rubber valve core and a valve seat 1. The valve core comprises a sealing portion 2 and a flow passage 3 from top to bottom. The sealing portion is in the shape of a bowl with a closed bottom end, and is used to regulate the flow area of ​​a flow passage between the valve seat and the valve seat or to block the flow passage. The flow passage is in the shape of an inverted cup (or trumpet), and a flow port 4 penetrating inside and outside is provided on the side wall of the flow passage. The flow port is used for medium (referring to gas) to flow through. The flow passage also plays a supporting role for the sealing portion. The bottom end of the valve core is provided with an annular valve core bottom edge 5 extending radially outward, which is used for assembly with the valve seat. The valve seat is annular and is provided with a flow hole 6. The flow hole includes a gradually decreasing aperture section and a constant aperture section from top to bottom. The bottom end of the valve seat is provided with a valve seat bottom edge 7 extending radially outward for assembly in a gas overflow valve. The outer edge diameter of the valve core bottom edge is smaller than the outer edge diameter of the valve seat bottom edge and larger than the aperture of the constant aperture section. The valve core is coaxially located in the valve seat to form a valve sealing pair. The bottom edge of the valve core rests on the bottom wall of the valve seat from bottom to top, and a suitable connecting structure may be provided to achieve a fixed connection between the two. The sealing portion is located above the constant aperture section, and a spacing is left between the outer wall of the sealing portion and the hole wall of the gradually decreasing aperture section as a flow passage or a part of a flow passage.

[0033] The outer wall surface of the sealing part is preferably an inverted cone surface with a gradually decreasing outer diameter from top to bottom, and the hole wall surface of the gradually decreasing aperture section is preferably an inverted cone surface with a gradually decreasing aperture from top to bottom. The outer wall of the sealing part and the hole wall of the gradually decreasing aperture section can be arranged in parallel, or the distance between the outer wall of the sealing part and the hole wall of the gradually decreasing aperture section gradually increases from top to bottom. Such an arrangement is convenient for the sealing part to quickly change the flow area of ​​the valve or block the flow channel when the flow portion undergoes elastic deformation, and will not hinder the flow of the medium in the flow channel.

[0034] The flow portion is preferably located in the equal-diameter section, and a distance is left between the outer wall of the flow portion and the hole wall of the equal-diameter section as a part of the flow passage.

[0035] The area of ​​the flow opening is preferably not less than 1 / 4 of the side wall area of ​​the flow portion, and not more than 1 / 2 of the side wall area of ​​the flow portion. This arrangement not only helps the flow portion to elastically deform sensitively (when subjected to external force) and can effectively support the sealing portion, but also does not affect the flow of the medium.

[0036] The flow port is preferably provided with a vertical support rib 8, the top end of which is connected to the outer edge of the bottom wall of the sealing portion, and the bottom end is connected to the inner edge of the bottom edge of the valve core, to provide auxiliary support for the sealing portion, thereby ensuring that under normal conditions, the sealing portion does not tilt toward the direction of the flow port.

[0037] The number of the support ribs may be one or more. When the number of the support ribs is more than one, the support ribs are evenly distributed in the flow opening along the circumference of the flow portion.

[0038] The support rib and the flow portion may be an integral structure and made of the same material. The valve core may be made of EPDM rubber.

[0039] The bottom wall of the valve seat is preferably provided with an annular groove 9 conforming to the bottom edge of the valve core, the annular groove is opened from bottom to top, the depth (or height) of the annular groove corresponds to the thickness (or height) of the bottom edge of the valve core, the bottom edge of the valve core is embedded in the annular groove to achieve relative fixation between the valve core and the valve seat, after the bottom edge of the valve core is embedded in the annular groove, the bottom surface of the valve core and the bottom surface of the valve seat are in the same plane, which is convenient for assembly in the gas overflow valve.

[0040] The bottom surface of the valve seat is preferably provided with a positioning column 10 extending vertically downward, and the bottom edge of the valve core is provided with a positioning hole matching the positioning column. The positioning column is inserted into the positioning hole to achieve circumferential positioning between the valve core and the valve seat.

[0041] The number of the positioning posts can be several, and the several positioning posts are evenly distributed along the circumference of the bottom surface of the valve seat, the number of the positioning holes is the same as the number of the positioning posts, and the setting positions on the bottom edge of the valve core correspond to the setting positions of the positioning posts on the bottom surface of the valve seat. The positioning holes can be through holes or blind holes, preferably through holes.

[0042] The outer diameter of the top end of the sealing portion is preferably smaller than the outer diameter of the top end of the valve seat, so that when the gas overflow valve sealing structure is assembled into the gas overflow valve, a distance is left between the top end of the sealing portion and the inner wall of the gas overflow valve at its assembly position, which does not affect the flow of the medium.

[0043] The top of the sealing portion is preferably provided with an annular valve core top edge 11 extending radially outward, and the outer edge diameter (or outer diameter) of the valve core top edge is larger than the inner diameter of the top of the valve seat, and smaller than the outer diameter of the top of the valve seat. Such a configuration not only helps the valve core to quickly close the flow passage under corresponding conditions (the valve core top edge can immediately abut against the top surface of the valve seat to achieve a seal between the two), but also does not affect the flow of the medium.

[0044] See also Figure 4 The present invention also discloses a gas overflow valve, in which a valve sealing structure is coaxially provided in a medium flow channel for adjusting flow and closing the medium flow channel. The valve sealing structure adopts any one of the gas overflow valve sealing structures disclosed in the present invention, wherein the sealing portion faces the inlet direction side of the medium flow channel, and the valve seat faces the outlet direction side of the medium flow channel.

[0045] During the use of the gas overflow valve, when the pressure difference on both sides of the gas overflow valve sealing structure exceeds a preset threshold value (or the flow exceeds a preset threshold value), the flow portion undergoes elastic deformation under the action of the medium pressure, and the sealing portion can be quickly pressed down and tilted in the direction of the flow port, thereby reducing the area of ​​the flow port and the distance between the outer wall of the valve core and the hole wall of the flow hole of the valve seat (reducing the flow area of ​​the gas overflow valve sealing structure), and even the outer wall of the sealing portion is pressed tightly against the inner wall of the valve seat or the flow port is closed, thereby quickly adjusting the medium flow of the valve to avoid danger caused by the pressure difference on both sides of the gas overflow valve sealing structure or excessive rear end flow. When the pressure difference on both sides of the gas overflow valve sealing structure returns to within the preset threshold range (or the flow returns to within the preset threshold range), the flow portion returns to its original shape through its own elasticity, and the medium flow of the valve is restored accordingly. When the gas system or pipeline at the rear end of the gas overflow valve sealing structure leaks, the pressure on the outlet side of the gas overflow valve sealing structure will drop rapidly, and then the pressure difference on both sides of the gas overflow valve sealing structure will increase rapidly. Under the action of the medium pressure, the flow portion will rapidly undergo a large elastic deformation, and the sealing portion will move downward and fit tightly against the inner wall of the valve seat to close the flow channel, which can quickly and effectively prevent the medium from continuing to leak, thereby eliminating subsequent safety hazards and avoiding waste of resources.

[0046] An annular fireproof heat expansion ring 12 is preferably provided in the medium flow channel, and the fireproof heat expansion ring is located on the outlet direction side of the medium flow channel of the gas overflow valve sealing structure. The fireproof heat expansion ring is preferably made of heat expansion material, and the heat expansion material can be a heat expansion material under the existing technology such as polyurethane or polystyrene. When a fire occurs in the gas system, pipeline or user end at the rear end of the gas overflow valve sealing structure, the fireproof heat expansion ring expands rapidly due to heat, blocks the medium flow channel and fills the holes formed by ablation of nearby non-metallic parts, thereby blocking the flame, which can effectively prevent the flame from entering the gas supply system (flashback), ensure the safety of the gas supply system, and avoid causing greater safety accidents.

[0047] The gas overflow valve preferably includes a valve body 13 and a valve cover 14, both of which are in the shape of a vertical variable diameter tube, the diameter of the upper pipe section of the valve body (including inner diameter and outer diameter, the same below) is larger than the diameter of the lower pipe section, the diameter of the upper pipe section of the valve cover (including inner diameter and outer diameter, the same below) is smaller than the diameter of the lower pipe section, the inner wall of the upper pipe section of the valve body is provided with an internal thread, the outer wall of the lower pipe section of the valve cover is provided with an external thread matching the internal thread, the valve cover is coaxially threadedly connected to the valve body, and the valve cover is located on the upper part of the valve body. The bottom end of the valve cover is located in the upper pipe section of the valve body, the pipe hole of the upper pipe section of the valve body and the pipe hole of the lower pipe section of the valve cover constitute a valve cavity, the gas overflow valve sealing structure and the fireproof thermal expansion ring are both located in the valve cavity, the fireproof thermal expansion ring is arranged on the reducing table in the valve cover, the gas overflow valve sealing structure is arranged on the top surface of the fireproof thermal expansion ring, the bottom end of the valve cover is against the bottom edge of the valve seat from top to bottom, so as to realize the positioning of the gas overflow valve sealing structure and the fireproof thermal expansion ring in the valve cavity.

[0048] A distance is left between the top outer edge of the sealing portion (referring to the outer edge of the top edge of the valve core) and the cavity wall of the valve cavity for medium to flow through.

[0049] The pipe hole of the valve body preferably includes a wide diameter section, a variable diameter section and a narrow diameter section from top to bottom, the pipe diameter of the variable diameter section gradually decreases from top to bottom, the top pipe diameter of the variable diameter section is the same as the pipe diameter of the wide diameter section, and the bottom pipe diameter of the variable diameter section is the same as the pipe diameter of the narrow diameter section; the pipe hole of the valve cover includes a narrow diameter section, a variable diameter section and a wide diameter section from top to bottom, the pipe diameter of the variable diameter section gradually expands from top to bottom, the top pipe diameter of the variable diameter section is the same as the pipe diameter of the narrow diameter section, and the bottom pipe diameter of the variable diameter section is the same as the pipe diameter of the wide diameter section.

[0050] External threads may be provided on the outer wall of the lower pipe section of the valve body and the outer wall of the upper pipe section of the valve cover to facilitate connection with other components in the gas system.

[0051] The outer diameter of the fireproof heat expansion ring corresponds to the diameter of the wide diameter section of the pipe hole of the valve body, which is convenient for assembly. The inner diameter of the fireproof heat expansion ring is larger than the inner diameter of the bottom end of the valve seat. The outer edge diameter of the bottom edge of the valve seat corresponds to the diameter of the wide diameter section of the pipe hole of the valve body, which is convenient for assembly.

[0052] The main part of the valve seat (except the part at the bottom edge of the valve seat) is located in the wide diameter section of the pipe hole of the valve cover. This arrangement facilitates the bottom end of the valve cover to rest against the bottom edge of the valve seat from top to bottom, thereby realizing the positioning of the gas overflow valve sealing structure and the fireproof thermal expansion ring in the valve cavity.

[0053] There is preferably a gap between the outer edge of the top edge of the valve core and the tube wall of the tube hole of the valve cover (the tube wall of the wide diameter section and / or the tube wall of the reduced diameter section of the tube hole of the valve cover) to facilitate the medium to pass through and enter the flow channel.

[0054] The distance between the outer edge of the top edge of the valve core and the tube wall of the tube hole of the valve cover, the distance between the outer wall of the valve core and the hole wall of the flow hole (including the distance between the outer wall of the sealing part and the hole wall of the hole diameter tapering section of the flow hole and the distance between the outer wall of the flow part and the hole wall of the hole diameter equal section of the flow hole), the flow port and the internal space of the flow part constitute a flow channel for the medium, connecting the medium flow channels on the upper and lower sides of the gas overflow valve sealing structure.

[0055] An annular gasket 15 is preferably provided between the fireproof heat expansion ring and the valve seat to provide a stable support for the gas overflow valve sealing structure. The outer diameter of the gasket corresponds to the diameter of the wide diameter section of the pipe hole of the valve body, and the inner diameter of the gasket corresponds to the inner diameter of the fireproof heat expansion ring, so as to facilitate assembly. The gasket can be an aluminum gasket.

[0056] Any gas overflow valve sealing structure of the present invention can be used for any gas overflow valve of the present invention.

[0057] Any gas overflow valve of the present invention may also adopt any gas overflow valve sealing structure of the present invention.

[0058] Unless otherwise specified or one preferred or optional technical means is a further limitation of another technical means, all preferred and optional technical means disclosed in the present invention can be arbitrarily combined to form several different technical solutions.

Claims

1. Gas overflow valve sealing structure, characterized by The invention comprises a rubber valve core and a valve seat, wherein the valve core comprises a sealing part and a flow portion from top to bottom, the sealing part is in the shape of a bowl with a closed bottom end, the flow portion is in the shape of an inverted cup, and a flow port penetrating inside and outside is arranged on its side wall, the bottom end of the valve core is provided with an annular valve core bottom edge extending radially outward, the valve seat is annular, and is provided with a flow hole, the flow hole comprises an aperture tapering section and an aperture equal diameter section from top to bottom, the bottom end of the valve seat is provided with a valve seat bottom edge extending radially outward, the outer edge diameter of the valve core bottom edge is smaller than the outer edge diameter of the valve seat bottom edge and larger than the aperture of the aperture equal diameter section, the valve core is coaxially located in the valve seat, the valve core bottom edge abuts against the bottom wall of the valve seat from bottom to top, the sealing part is located above the aperture equal diameter section, and a spacing is left between the outer wall of the sealing part and the aperture wall of the aperture tapering section.

2. The gas overflow valve sealing structure according to claim 1, characterized in that The outer wall surface of the sealing portion and the hole wall surface of the aperture tapering section are both inverted cone surfaces, the outer wall of the sealing portion is parallel to the hole wall of the aperture tapering section, or the distance between the outer wall of the sealing portion and the hole wall of the aperture tapering section increases gradually from top to bottom.

3. The gas overflow valve sealing structure according to claim 1, characterized in that The flow port is provided with a vertical support rib, the top end of the support rib is connected to the outer edge of the bottom wall of the sealing portion, and the bottom end is connected to the inner edge of the bottom edge of the valve core.

4. The gas overflow valve sealing structure according to claim 1, characterized in that An annular groove conforming to the bottom edge of the valve core is provided on the bottom wall of the valve seat, the depth of the annular groove corresponds to the thickness of the bottom edge of the valve core, and the bottom edge of the valve core is embedded in the annular groove.

5. The gas overflow valve sealing structure according to claim 1, characterized in that A positioning column extending vertically downward is provided on the bottom surface of the valve seat, a positioning hole matching with the positioning column is provided on the bottom edge of the valve core, and the positioning column is inserted into the positioning hole.

6. The gas overflow valve sealing structure according to claim 1, characterized in that An outer diameter of a top end of the sealing portion is smaller than an outer diameter of a top end of the valve seat.

7. Gas overflow valve, its characteristics are A valve sealing structure is coaxially arranged in the medium flow channel, and the valve sealing structure adopts the gas overflow valve sealing structure described in any one of claims 1 to 6, the sealing portion faces the inlet direction of the medium flow channel, and the valve seat faces the outlet direction of the medium flow channel.

8. The gas overflow valve according to claim 7, characterized in that An annular fireproof thermal expansion ring is arranged in the medium flow channel, and the fireproof thermal expansion ring is located at the outlet direction side of the medium flow channel of the gas overflow valve sealing structure.

9. The gas overflow valve according to claim 8, characterized in that The utility model comprises a valve body and a valve cover, wherein the valve body and the valve cover are both in the shape of a vertical reducing tube, the diameter of the upper tube section of the valve body is larger than the diameter of the lower tube section, the diameter of the upper tube section of the valve cover is smaller than the diameter of the lower tube section, the valve cover is coaxially threadedly connected with the valve body, the valve cover is located above the valve body, the bottom end of the valve cover is located in the upper tube section of the valve body, the tube hole of the upper tube section of the valve body and the tube hole of the lower tube section of the valve cover constitute a valve cavity, the gas overflow valve sealing structure and the fireproof thermal expansion ring are both located in the valve cavity, the fireproof thermal expansion ring is arranged on the reducing table surface in the valve cover, the gas overflow valve sealing structure is arranged on the top surface of the fireproof thermal expansion ring, and the bottom end of the valve cover abuts against the bottom edge of the valve seat from top to bottom.

10. The gas overflow valve according to claim 9, characterized in that A distance is left between the top end of the sealing portion and the cavity wall of the valve cavity.

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