CN220366009U - Valve assembly and gas meter - Google Patents

Abstract

The utility model belongs to the technical field of gas meters, and particularly relates to a valve assembly and a gas meter, wherein the valve assembly comprises: the valve rod is provided with a limit structure; the hot melt fixing piece is arranged on the valve rod and is in limit fit with the limit structure; the sealing piece is arranged on the valve rod and positioned on one side of the hot melting fixing piece, and can move along the axial direction of the valve rod; the elastic piece is arranged on the valve rod and is positioned on one side, away from the hot melting fixing piece, of the plugging piece, and when the temperature of the valve rod reaches a set temperature, the elastic piece pushes the plugging piece to move along the axial direction of the valve rod. The valve assembly can timely plug the air inlet of the gas meter when the temperature of the gas meter reaches the set temperature, reduces the potential safety hazard of combustion of the gas in the gas meter, and ensures the personal and property safety of users.

Description

Valve assembly and gas meter

Technical Field

The utility model belongs to the technical field of gas meters, and particularly relates to a valve assembly and a gas meter.

Background

This section provides merely background information related to the present disclosure and is not necessarily prior art.

In the related art, the gas meter measures the flow of gas through the metering circuit, and when the metering circuit in the gas meter has abnormal short circuit, the temperature in the gas meter rises to a certain degree, and the combustion of gas in the gas meter can be caused, and if the air inlet of the gas meter can not be closed in time, the burnt gas is likely to burn along the air inlet pipeline, and great potential safety hazards are brought to the human body and property of a user.

Disclosure of Invention

The utility model aims to at least solve the problem that an air inlet of a gas meter cannot be closed in time after the temperature in the gas meter is raised to a certain degree. The aim is achieved by the following technical scheme:

a first aspect of the present utility model proposes a valve assembly comprising:

the valve rod is provided with a limiting structure;

the hot melt fixing piece is arranged on the valve rod and is in limit fit with the limit structure;

the plugging piece is arranged on the valve rod and positioned at one side of the hot melt fixing piece, and the plugging piece can move along the axial direction of the valve rod;

the elastic piece is arranged on the valve rod and is positioned on one side, away from the hot melting fixing piece, of the plugging piece, and when the temperature of the valve rod reaches a set temperature, the elastic piece pushes the plugging piece to move along the axial direction of the valve rod.

According to the valve assembly, when the valve assembly is applied to a gas meter, the temperature in the gas meter is transmitted to the valve rod, when the temperature of the valve rod is lower than a set temperature, the limiting structure limits the hot-melt fixing piece, the elastic piece is in a compressed state at the moment, when the temperature of the valve rod reaches the set temperature, the hot-melt fixing piece is in fusion deformation, the limiting structure does not limit the hot-melt fixing piece any more, and the blocking piece moves along the axial direction of the valve rod under the action of the elastic force of the elastic piece, so that the gas inlet of the gas meter is blocked. The utility model can plug the gas inlet of the gas meter in time when the temperature of the gas meter reaches the set temperature, reduces the potential safety hazard of burning the gas in the gas meter, and ensures the personal and property safety of users.

In addition, the valve assembly according to the utility model may have the following additional technical features:

in some embodiments of the present utility model, the limiting structure includes a convex hull disposed on the valve rod, and the hot-melt fixing member is a hot-melt fixing ring, and the hot-melt fixing ring is sleeved between the convex hull and the plugging member.

In some embodiments of the utility model, the closure comprises a first securing plate, a second securing plate, and a melt plate positioned between the first securing plate and the second securing plate.

In some embodiments of the present utility model, the second fixing plate further includes a plurality of claws spaced apart in a circumferential direction of the second fixing plate, the plurality of claws being used to press the first fixing plate against the melt plate.

In some embodiments of the utility model, the resilient member comprises a tension spring that is sleeved on the valve stem.

And/or the valve assembly further comprises a supporting piece, wherein the supporting piece is fixed on the valve rod and is positioned on one side of the plugging piece, which is away from the hot melt fixing piece, and two ends of the elastic piece are respectively connected with the supporting piece and the plugging piece.

In some embodiments of the present utility model, the valve assembly further includes a clip spring and a connecting arm, where the clip spring is sleeved on the valve rod and is located on a side of the limiting structure away from the plugging member, and the limiting structure is located between the clip spring and the hot-melt fixing member, and one end of the connecting arm is connected to the valve rod, and the other end of the connecting arm is connected to the clip spring.

A second aspect of the present utility model proposes a gas meter comprising:

a housing having a receiving cavity and an air inlet;

the valve assembly is arranged in the accommodating cavity, the blocking piece of the valve assembly is arranged corresponding to the air inlet, part of the valve rod stretches into the air inlet, and the valve assembly is provided with a first state and a second state, wherein the blocking piece is arranged at intervals from the air inlet in the first state, and the blocking piece blocks the air inlet in the second state.

According to the gas meter, when the temperature of the gas meter reaches the set temperature, the gas inlet of the gas meter can be plugged by the valve component in time, so that the potential safety hazard of burning gas in the gas meter is reduced, and the personal and property safety of a user is ensured.

In some embodiments of the present utility model, the air inlet includes a first through hole, a second through hole and a third through hole that are sequentially communicated along an air inlet direction, the caliber of the first through hole is smaller than that of the second through hole, the clamp spring of the valve assembly is clamped on the inner wall surface of the second through hole and is abutted with one end, close to the second through hole, of the first through hole, and in the second state, the blocking piece seal is in contact with the inner wall surface of the third through hole.

In some embodiments of the present utility model, a guiding surface is disposed at an end of the third through hole away from the second through hole, and the guiding surface is expanded from the end of the third through hole away from the second through hole toward the accommodating cavity.

In some embodiments of the utility model, the gas meter further comprises a support bracket, the support bracket is arranged on the inner wall of the shell, and the valve assembly is arranged on the support bracket.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like elements are denoted by like reference numerals throughout the drawings. In the drawings:

fig. 1 schematically shows a block diagram of a valve assembly according to an embodiment of the utility model.

Fig. 2 schematically illustrates an exploded view of a valve assembly according to an embodiment of the present utility model.

Fig. 3 shows schematically an exploded view of a closure according to an embodiment of the utility model.

Fig. 4 schematically shows a cross-sectional view of a valve assembly according to an embodiment of the present utility model in a normal state.

Fig. 5 schematically illustrates a cross-sectional view of a valve assembly in a plugged state according to an embodiment of the present utility model.

Fig. 6 schematically shows an exploded view of a gas meter according to an embodiment of the present utility model.

Fig. 7a schematically illustrates a schematic view of the valve assembly according to an embodiment of the utility model in cooperation with a housing in a first state.

Fig. 7b schematically shows a partial cross-sectional view of the valve assembly according to an embodiment of the utility model in cooperation with the housing in a first state.

Fig. 7c schematically shows an enlarged view at a in fig. 7 b.

Fig. 8a schematically shows a schematic view of the valve assembly according to an embodiment of the utility model in cooperation with a housing in a second state.

Fig. 8b schematically shows a partial cross-sectional view of the valve assembly according to an embodiment of the utility model in cooperation with the housing in a second state.

Fig. 8c schematically shows an enlarged view at B in fig. 8B.

The reference numerals are as follows:

10. a valve assembly; 11. a valve stem; 111. a limit structure; 12. a hot melt fixture; 13. a blocking member; 131. a first fixing plate; 132. a hot melt plate; 133. a second fixing plate; 1331. a claw; 14. an elastic member; 15. clamping springs; 16. a connecting arm; 17. a support; 20. a housing; 21. a first housing portion; 22. a second housing portion; 23. an air inlet; 231. a first through hole; 232. a second through hole; 233. a third through hole; 234. a guide surface; 24. an air outlet; 30. a metering module; 40. a support frame; 50. screw connection.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," and "including" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

According to an embodiment of the present utility model, as shown in fig. 1-5, a valve assembly 10 is provided, where the valve assembly 10 can be used to block a fluid inlet of a flammable fluid, for example, the valve assembly 10 is applied to a gas meter, and can block an air inlet 23 of the gas meter when a temperature in the gas meter reaches a set temperature. Referring to fig. 1 and 2, the valve assembly 10 includes a valve stem 11, a blocking member 13, a hot-melt fixing member 12, and an elastic member 14, and the valve stem 11 is made of a high-temperature-resistant metal material. The valve stem 11 has a cross section of, for example, a circular shape, an elliptical shape, or a square shape. The valve rod 11 is also provided with a limiting structure 111, and the limiting structure 111 is used for limiting the hot melt fixing piece 12. The limiting structure 111 may be independent of the valve rod 11, and may be disposed on the valve rod 11 by one of clamping, inserting, connecting, bonding or welding, or may be integrally formed with the valve rod 11. Referring to the orientation shown in fig. 1-5, the stop structure 111 is positioned at a distance from the top end of the valve stem 11 to ensure that the closure member 13 does not disengage from the valve stem 11 when moved in the axial direction of the valve stem 11. Illustratively, the limit structure 111 is disposed in the middle of the valve stem 11.

Referring to fig. 1 and 2, a hot-melt fixing member 12 is disposed on the valve stem 11, and the hot-melt fixing member 12 is used for limiting cooperation with the limiting structure 111. The hot melt fixture 12 comprises a hot melt material that melts and deforms when the ambient temperature reaches a melting temperature, such as a resin material. In one example, the hot melt fixture 12 is integrally formed of a hot melt material. In another example, part of the structure of the hot-melt fixing member 12 is made of a hot-melt material, for example, a part of the hot-melt fixing member 12 that is in limit fit with the limit structure 111 is made of a hot-melt material. In practical application, a proper hot-melt material can be selected according to the requirement of the melting temperature. For example, when the valve assembly 10 is used in a gas meter, the melting point of the hot melt material selected for the hot melt fixture 12 is the maximum temperature value of the safe temperature range of the gas meter. Referring to fig. 4, when the temperature in the gas meter is in the safe temperature range, the limiting structure 111 plays a role in limiting the hot-melt fixture 12. Referring to fig. 5, when the temperature in the gas meter exceeds the safety temperature, the temperature of the valve rod 11 also exceeds the safety temperature, the hot-melt fixing member 12 will melt and deform, the hardness of the hot-melt fixing member 12 decreases, the mechanical properties decrease, the limiting structure 111 cannot limit the hot-melt fixing member 12, and the hot-melt fixing member 12 can move axially along the valve rod 11 beyond the limiting structure 111 under the action of external force.

Referring to fig. 1 to 3, a blocking piece 13 is provided to the valve stem 11, and the blocking piece 13 is movable in an axial direction of the valve stem 11. When the valve assembly 10 is arranged on the gas meter, the blocking piece 13 is used for blocking the gas inlet 23 of the gas meter when the temperature of the valve rod 11 reaches the set temperature. The structure of the blocking piece 13 is adapted to the gas inlet 23 of the gas meter. Referring to fig. 4, when the hot-melt fixing member 12 is in a limit fit with the limit structure 111, it is difficult for the blocking member 13 to move axially along the valve stem 11 to block the gas meter's gas inlet 23, and at this time, the gas meter's gas inlet 23 is maintained in an open state. Referring to fig. 5, when the hot-melt fixing member 12 reaches its melting temperature due to the temperature of the valve stem 11, the hot-melt fixing member 12 is melt-deformed, and the blocking member 13 can axially move along the valve stem 11 under the action of an external force, thereby blocking the gas inlet 23 of the gas meter. In an example, the plugging member 13 is disc-shaped, a circular hole is formed in the center of the plugging member 13, the valve rod 11 penetrates through the circular hole of the plugging member 13, the size of the circular hole is larger than that of the limiting structure 111, and when the plugging member 13 moves along the axial direction of the valve rod 11, the plugging member 13 can cross the limiting structure 111 to plug the air inlet 23 of the gas meter.

Referring to fig. 1 and 2, an elastic member 14 is disposed on the valve stem 11 and located on a side of the plugging member 13 away from the hot-melt fixing member 12, and the elastic member 14 is, for example, a tension spring, and the tension spring is sleeved on the valve stem 11. The end of the elastic member 14 near the blocking member 13 may be directly connected to the blocking member 13 or may abut against the blocking member 13. The end of the elastic member 14 away from the blocking member 13 may be directly fixed to the valve stem 11, or may be fixed to the support frame 40 by providing the support frame 40 on the valve stem 11, and the end of the elastic member 14 away from the blocking member 13. When the temperature of the valve rod 11 reaches the set temperature, the elastic piece 14 can drive the plugging piece 13 to move along the axial direction of the valve rod 11. The set temperature may be determined according to an application scenario of the valve assembly 10, for example, when the plugging member 13 assembly is applied to a gas meter, the set temperature is a maximum temperature value of a safe temperature range of the gas meter. Referring to fig. 4, when the temperature in the gas meter is in the safe temperature range, the elastic member 14 is in a compressed state, stores elastic potential energy, and the blocking member 13 is limited between the elastic member 14 and the hot-melt fixing member 12. Referring to fig. 5, when the temperature in the gas meter is higher than the safe temperature range, after the hot-melt fixing member 12 is melted and deformed, the elastic force of the elastic member 14 is greater than the force of the hot-melt fixing member 12 and the limiting structure 111 for limiting cooperation, and the elastic member 14 will push the hot-melt fixing member 12 and the plugging member 13 to sequentially pass through the limiting structure 111, so that the hot-melt fixing member 12 and the plugging member 13 respectively move along the axial direction of the valve rod 11.

In this embodiment, when the valve assembly 10 is applied to a gas meter, the temperature in the gas meter will be transferred to the valve rod 11, when the temperature of the valve rod 11 is lower than the set temperature, the limiting structure 111 limits the hot-melt fixing member 12, the elastic member 14 is in a compressed state at this time, when the temperature of the valve rod 11 reaches the set temperature, the hot-melt fixing member 12 is melted and deformed, the limiting structure 111 does not limit the hot-melt fixing member 12 any more, and the blocking member 13 moves along the axial direction of the valve rod 11 under the action of the elastic force of the elastic member 14 so as to block the air inlet 23 of the gas meter. According to the utility model, the air inlet 23 of the gas meter can be plugged in time when the temperature of the gas meter reaches the set temperature, so that the potential safety hazard of burning the gas in the shell 20 is reduced, and the personal and property safety of a user is ensured.

The structures of the stopper 111 and the hot-melt fixture 12 of the present embodiment are not limited. In an example (not shown in the illustration), the limiting structure 111 includes a limiting slot disposed on the valve rod 11, and the hot-melt fixing element 12 includes a limiting buckle, where the limiting buckle extends into the limiting slot to realize a limiting fit between the hot-melt fixing element 12 and the limiting structure 111. When the temperature of the valve rod 11 exceeds the set temperature, the limiting buckle melts and deforms, the hardness of the limiting buckle is reduced, and under the elastic acting force of the elastic piece 14, the limiting buckle breaks away from the limiting clamping groove and passes over the limiting clamping groove, and the hot-melt fixing piece 12 moves along the axial direction of the valve rod 11. In another example, referring to fig. 1 and 2, the limit structure 111 includes a convex hull provided to the valve stem 11. Illustratively, the limit structure 111 includes two convex hulls on opposite sides of the valve stem 11, with the two convex hulls being on the same horizontal plane. Illustratively, the limiting structure 111 includes a plurality of convex hulls, which are located on the same horizontal plane, and are arranged at intervals along the circumferential direction of the valve stem 11. The hot-melt fixing piece 12 is a hot-melt fixing ring, and the hot-melt fixing ring is sleeved on the valve rod 11 and is positioned between the convex hull and the plugging piece 13. When the temperature of the valve rod 11 exceeds the set temperature, the hot-melt fixing ring is melt-deformed, the hardness of the hot-melt fixing ring is reduced, and the hot-melt fixing ring passes over the convex hull and moves in the axial direction of the valve rod 11 under the elastic force of the elastic member 14.

The structure of the blocking member 13 of the present embodiment is not limited, and in one example (not shown in the drawing), the blocking member 13 is a piston member made of an elastic material. In another example, referring to fig. 3, the blocking member 13 includes a first fixing plate 131, a second fixing plate 133, and a fusing plate 132, and the fusing plate 132 is positioned between the first fixing plate 131 and the second fixing plate 133. The first and second fixing plates 131 and 133 are made of a metal material resistant to high temperature. The hot-melt plate 132 can be melt-deformed when the temperature reaches the set temperature, and the hot-melt plate 132 may be made of the same material as the hot-melt fixture 12 or a different material from the hot-melt fixture 12. Under the application scene of the gas meter, when the temperature of the valve rod 11 reaches the set temperature, after the air inlet 23 is plugged by the plugging piece 13, the hot melting plate 132 is melted and deformed, and the volume of the hot melting plate 132 is increased, so that a gap between the air inlet 23 and the plugging piece 13 is completely plugged.

In some embodiments, the second fixing plate 133 further includes a plurality of claws 1331, the plurality of claws 1331 are disposed at peripheral edges of the second fixing plate 133 and are spaced apart along a circumferential direction of the second fixing plate 133, and the plurality of claws 1331 are used for press-fastening the first fixing plate 131 to the hot melt plate 132, so as to ensure assembly reliability among the first fixing plate 131, the hot melt plate 132 and the second fixing plate 133. In other possible manners, the first fixing plate 131, the hot melt plate 132, and the second fixing plate 133 may be reliably connected by, for example, bonding or connecting a connecting member, which will not be described herein.

In some embodiments, referring to fig. 1 and 2, the valve assembly 10 further includes a support member 17, the support member 17 being fixed to the valve stem 11 and located on a side of the closure member 13 facing away from the hot melt fixture 12, the support member 17 being configured to provide rigid support to an end of the elastic member 14 facing away from the closure member 13, the ends of the elastic member 14 being connected to the support member 17 and the closure member 13, respectively. In one example, the support 17 comprises a support ring, an internal thread is provided on an inner ring of the support ring, an external thread is provided on the valve rod 11 at a position corresponding to the support ring, and the support ring is sleeved on the valve rod 11 and is fixed to the valve rod 11 through matching of the internal thread and the external thread.

In the present embodiment, the two ends of the elastic member 14 are connected to the supporting member 17 and the blocking member 13, respectively, either the two ends of the elastic member 14 are directly connected to the supporting member 17 and the blocking member 13, respectively, or the two ends of the elastic member 14 are in contact with the supporting member 17 and the blocking member 13, respectively, that is, the two ends of the elastic member 14 are in contact with the supporting member 17 and the blocking member 13, respectively.

In some embodiments, referring to fig. 1 and 2, the valve assembly 10 further includes a clamp spring 15 and a connecting arm 16, the clamp spring 15 is in a closed ring structure or an open ring structure, the clamp spring 15 is sleeved on the valve rod 11 and is located on one side of the limiting structure 111, which is away from the plugging member 13, the connecting arm 16 is located in a radial direction of the clamp spring 15, one end of the connecting arm 16 is connected with the valve rod 11, and the other end of the connecting arm 16 is connected with the clamp spring 15. The clamp spring 15 is used for arranging the valve rod 11 at an air inlet 23 of the valve assembly 10 to be blocked. The connecting arm 16 connects the clamping spring 15 with the valve rod 11 on the one hand, and on the other hand, forms a travel limit when the blocking piece 13 moves along the axial direction of the valve rod 11, so that the blocking piece 13 is prevented from being separated from the valve rod 11. In the gas meter application scenario, according to fig. 7b and 8b, the clamp spring 15 is used for matching with the gas inlet 23 of the gas meter, and at this time, the center of the clamp spring 15 coincides with the center of the gas inlet 23. The size of the clamp spring 15 is slightly larger than that of the air inlet 23, so that the clamp spring 15 is clamped in the air inlet 23 and cannot fall off. The valve rod 11 is clamped at the air inlet 23 through the clamp spring 15 and is arranged at the air inlet 23, when the temperature of the valve rod 11 reaches the set temperature, the hot-melt fixing piece 12 is melted and deformed, and the blocking piece 13 moves along the axial direction of the valve rod 11 under the elastic acting force of the elastic piece 14 to block the air inlet 23. In order to ensure the sealing effect of the closure element 13 on the air inlet opening 23, the valve rod 11 passes through the center of the clamping spring 15, i.e. the valve rod 11 is located on the axis of the air inlet opening 23.

In some embodiments, as shown in fig. 6 to 8, the present embodiment provides a gas meter, where the gas meter includes a housing 20, and the housing 20 is made of a high-strength metal material, so that combustion and explosion caused inside the housing 20 can be isolated in the gas meter. The housing 20 has a receiving chamber and an air inlet 23, and a gas pipe is communicated with the air inlet 23, and gas in the gas pipe enters the receiving chamber through the air inlet 23. In an example, referring to fig. 6, the housing 20 includes a first housing portion 21 and a second housing portion 22, the first housing portion 21 and the second housing portion 22 are buckled to form the housing 20, and the air inlet 23 is provided in the first housing portion 21 or the second housing portion 22. The present embodiment further includes the valve assembly 10 disclosed in the foregoing embodiment, where the valve assembly 10 is disposed in the accommodating cavity, the valve assembly 10 and the blocking member 13 of the air inlet 23 are disposed corresponding to the air inlet 23, and a part of the valve rod 11 extends into the air inlet 23, and the valve assembly 10 has a first state in which the blocking member 13 is disposed at an interval from the air inlet 23, and a second state in which the blocking member 13 blocks the air inlet 23. Referring to fig. 7a-7b, when the temperature inside the housing 20 is below the set temperature, the valve assembly 10 is in the first state, a certain interval is provided between the blocking member 13 and the air inlet 23, and the fuel gas in the fuel gas pipe can enter the accommodating cavity through the air inlet 23. Referring to fig. 8a-8b, when the temperature inside the housing 20 reaches the set temperature, the hot-melt fixing member 12 melts and deforms, the blocking member 13 moves upwards under the elastic force of the elastic member 14, the blocking member 13 blocks the air inlet 23, and the valve assembly 10 is in the second state at this time, so that the potential safety hazard of burning of fuel gas inside the housing 20 is reduced, and the personal and property safety of a user is ensured.

In some embodiments, referring to fig. 7c and 8c, the air inlet 23 includes a first through hole 231, a second through hole 232, and a third through hole 233 that are sequentially communicated in an air inlet direction, and the fuel gas flows into the receiving cavity through the first through hole 231, the second through hole 232, and the third through hole 233 in sequence. The bore of first through-hole 231 is less than the bore of second through-hole 232, and the jump ring 15 joint of valve assembly 10 is at the internal face of second through-hole 232 to with the one end butt that is close to second through-hole 232 of first through-hole 231, the diapire of first through-hole 231 is to the spacing effect of blockking that jump ring 15 played, at the shutoff piece 13 along the in-process of valve rod 11 axial displacement with air inlet 23 shutoff, avoid jump ring 15 to appear the condition of shifting. In the second state, the blocking piece 13 contacts the inner wall surface of the third through hole 233 to block the air inlet 23. In an example, referring to fig. 7c and 8c, a guiding surface 234 is disposed at an end of the third through hole 233 far from the second through hole 232, the guiding surface 234 is expanded from an end of the third through hole 233 far from the second through hole 232 toward the direction of the accommodating cavity, and the guiding surface 234 plays a role in guiding the plugging member 13 so that the plugging member 13 can smoothly enter the third through hole 233.

In some embodiments, referring to fig. 6, the gas meter further includes a support frame 40, the support frame 40 is disposed on an inner wall of the housing 20, and the valve assembly 10 is disposed on the support frame 40. The support bracket 40 provides support for the valve assembly 10 and ensures reliable installation between the valve assembly 10 and the housing 20. Illustratively, the support frame 40 is a sheet metal member, and the support frame 40 is detachably fixed to the inner wall of the housing 20 through the screw connection member 50.

In some embodiments, referring to fig. 6, the housing 20 further has an air outlet 24, where the air outlet 24 is connected to the gas stove through a connection pipe, and the gas entering the accommodating cavity enters the gas stove through the air outlet 24 and the connection pipe, and is ignited and burned by the gas stove. The positions of the air inlet 23 and the air outlet 24 are not limited, and for example, the air inlet 23 is provided in the first housing portion 21, the air outlet 24 is provided in the second housing portion 22, or both the air inlet 23 and the air outlet 24 are provided in the first housing portion 21. The gas meter further comprises a metering module 30, the metering module 30 is arranged in the accommodating cavity, the metering module 30 is provided with an air inlet end and an air outlet end, the air inlet end is communicated with the accommodating cavity, the air outlet end is communicated with the air outlet 24, and gas in the accommodating cavity is discharged from the air outlet 24 after entering the metering module 30. The metering module 30 is used for metering the flow of the gas flowing through the gas meter, so that the consumption of the gas is convenient for a user to know, and the gas company can calculate the tariff.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. A valve assembly, the valve assembly comprising:

the valve rod is provided with a limiting structure;

the hot melt fixing piece is arranged on the valve rod and is in limit fit with the limit structure;

the plugging piece is arranged on the valve rod and positioned at one side of the hot melt fixing piece, and the plugging piece can move along the axial direction of the valve rod;

the elastic piece is arranged on the valve rod and is positioned on one side, away from the hot melting fixing piece, of the plugging piece, and when the temperature of the valve rod reaches a set temperature, the elastic piece pushes the plugging piece to move along the axial direction of the valve rod.

2. The valve assembly of claim 1, wherein the limiting structure comprises a convex hull disposed on the valve stem, the hot melt fixture is a hot melt fixture ring, and the hot melt fixture ring is sleeved on the valve stem and is disposed between the convex hull and the plugging member.

3. The valve assembly of claim 1, wherein the closure member comprises a first fixed plate, a second fixed plate, and a melt plate, the melt plate being located between the first fixed plate and the second fixed plate.

4. The valve assembly of claim 3, wherein the second securing plate further comprises a plurality of jaws spaced apart along a circumferential direction of the second securing plate, the plurality of jaws configured to compress the first securing plate against the melt plate.

5. The valve assembly of claim 1, wherein the resilient member comprises a tension spring, the tension spring being nested within the valve stem;

and/or the valve assembly further comprises a supporting piece, wherein the supporting piece is fixed on the valve rod and is positioned on one side of the plugging piece, which is away from the hot melt fixing piece, and two ends of the elastic piece are respectively connected with the supporting piece and the plugging piece.

6. The valve assembly of any one of claims 1-5, further comprising a clip spring and a connecting arm, wherein the clip spring is sleeved on the valve stem and located on a side of the limiting structure facing away from the blocking member, and one end of the connecting arm is connected to the valve stem, and the other end of the connecting arm is connected to the clip spring.

7. A gas meter, the gas meter comprising:

a housing having a receiving cavity and an air inlet;

the valve assembly of any one of claims 1-6 disposed within said receiving chamber, said blocking member of said valve assembly disposed in correspondence with said air inlet and a portion of said valve stem extending into said air inlet, said valve assembly having a first state in which said blocking member is spaced from said air inlet and a second state in which said blocking member blocks said air inlet.

8. The gas meter of claim 7, wherein the gas inlet comprises a first through hole, a second through hole and a third through hole which are sequentially communicated along a gas inlet direction, the caliber of the first through hole is smaller than that of the second through hole, the clamp spring of the valve assembly is clamped on the inner wall surface of the second through hole and is abutted with one end, close to the second through hole, of the first through hole, and in the second state, the sealing piece is in contact with the inner wall surface of the third through hole.

9. The gas meter of claim 8, wherein a guide surface is provided at an end of the third through hole away from the second through hole, and the guide surface is formed in an expanded shape from an end of the third through hole away from the second through hole toward the accommodating chamber.

10. The gas meter of claim 7, further comprising a support frame, the support frame being disposed on an inner wall of the housing, the valve assembly being disposed on the support frame.