Gas safety valve

Abstract

The utility model provides a gas safety valve, and belongs to the technical field of gas. The problem that the structure is complex while overcurrent cut-off is achieved is solved. An air inlet is formed in the front end of the valve body, an air outlet is formed in the rear end of the valve body, an overflowing cut-off assembly is arranged in the valve body and comprises a sealing seat and a sealing body, the sealing seat is in an annular block shape and is fixed in the valve body, and the sealing body is a rubber part. The sealing body is provided with a sealing part located in front of the sealing seat and an abutting part abutting against the rear side of the sealing seat, the abutting part is in an annular sheet shape, the abutting part and the sealing seat are fixed in the front-back direction, the sealing body is further provided with a connecting part penetrating through a center hole of the sealing seat, and the two ends of the connecting part are connected with the abutting part and the sealing part respectively. The connecting part has elasticity and can be compressed when being stressed in the front-back direction. The device has the advantages of simple structure, short length and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel gas and relates to a fuel gas safety valve. Background Art

[0002] Gas as a fuel has penetrated into thousands of households, especially in large and medium-sized cities, and pipeline gas has been installed in kitchens. In order to ensure the safe use of gas, China Patent discloses an over-temperature and over-current double cut-off gas valve with application number 202023104431.2, which includes a valve body and a valve cover connected to the valve body, and an over-current cut-off component and an over-temperature cut-off component are arranged in the valve cover. The over-current cut-off component includes a fixed sleeve, a support frame and a first sealing component. The inner side of the valve cover near one end of the valve body is provided with a first internal thread, the fixed sleeve is connected to the first internal thread, the support frame is arranged between the fixed sleeve and the inner wall of the valve cover, and the first sealing component is arranged between the support frame and the fixed sleeve. The first sealing component includes a first plug, a first guide rod and a first spring. One end of the first guide rod is connected to the fixed sleeve, and the other end is connected to the first plug. The outer sleeve of the first guide rod is provided with a first spring. The two ends of the first spring are respectively connected to the fixed sleeve and the first plug. The first plug can move along the expansion and contraction direction of the first spring to block the through hole of the valve cover near the valve body. Under normal conditions, the gas flow rate is not enough to overcome the effect of the first spring, and the first plug is away from the through hole to allow the gas to pass normally. When the pipe falls off or leaks, the gas flow rate will suddenly increase. At this time, the gas pressure is greater than the elastic force of the first spring, which will cause the first plug to compress the first spring and abut against the through hole on the side of the valve cover close to the valve body to achieve flow cutoff.

[0003] However, the over-current cut-off assembly has many components, which makes the structure of the entire valve complex and inconvenient to assemble. Utility Model Content

[0004] The utility model aims to solve the above problems existing in the prior art and proposes a gas safety valve, which solves the problem of complex structure while realizing over-current cut-off.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A gas safety valve comprises a valve body with an air inlet at the front end and an air outlet at the rear end, wherein an overcurrent cut-off assembly is arranged in the valve body, and characterized in that the overcurrent cut-off assembly comprises a sealing seat and a sealing body, wherein the sealing seat is in the shape of an annular block and is fixed in the valve body, and the sealing body is a rubber part, and the sealing body comprises a sealing portion located in front of the sealing seat and an abutting portion abutting against the rear side of the sealing seat, wherein the abutting portion is in the shape of an annular sheet and is fixed to the sealing seat in the front-to-back direction, and the sealing body further comprises a connecting portion passing through the center hole of the sealing seat, wherein the two ends of the connecting portion are respectively connected to the abutting portion and the sealing portion, and the connecting portion is elastic and can be compressed when subjected to force in the front-to-back direction.

[0007] Since the abutment and the sealing seat are fixed in the front-to-back direction, the elastic force of the connection part will act forward on the sealing part. Under normal use, the sealing part is in front of the sealing seat under the elastic force of the connection part and there is a gap between the sealing part and the front end surface of the sealing seat. The flow rate of the gas is not enough for the sealing part to overcome the effect of the connection part, and the gas can pass normally. When the pipe falls off or leaks, the internal gas flow rate will suddenly increase, and the gas pressure will increase instantly so that the force acting on the sealing part exceeds the elastic force of the connection part. In this way, the sealing part will squeeze the connection part to compress it and move the sealing part backward. The sealing seat will eventually abut against the front end opening of the center hole of the sealing seat and block it, thereby realizing the over-current cut-off.

[0008] The sealing body is provided with a sealing part located in front of the sealing seat, a supporting part abutting against the rear side of the sealing seat, and a connecting part having elasticity and connected to the supporting part and the sealing part at both ends. The positioning of the sealing body in the valve body is achieved by fixing the supporting part and the sealing seat in the front-to-back direction, and the connecting part is used to provide the sealing part with elastic force to separate from the sealing seat, so that the overcurrent cut-off function can be fully achieved only by setting the sealing body and the sealing seat, thereby greatly simplifying the structure while achieving the overcurrent cut-off function. Moreover, the connecting part passes through the center hole of the sealing seat, which is equivalent to directly using the center hole of the sealing seat for arrangement, thereby shortening the length of the entire overcurrent cut-off assembly, reducing the occupied space in the valve body, and making the length of the valve body smaller.

[0009] In the above-mentioned gas safety valve, the outer side of the sealing portion has a conical sealing surface, the outer diameter of the sealing surface gradually decreases from front to back, and the diameter of the central hole of the sealing seat is between the maximum outer diameter and the minimum outer diameter of the sealing surface.

[0010] Through the above arrangement, a tighter fit can be formed between the sealing portion and the sealing seat during overcurrent cutoff.

[0011] In the above-mentioned gas safety valve, the sealing portion is in a bowl shape, and the bowl mouth of the sealing portion is arranged to face forward.

[0012] The sealing part is arranged in a bowl shape, so that the weight of the sealing part is more moderate, and the situation that the sealing part cannot be pushed when the gas flows due to the heavy weight of the sealing part will not occur.

[0013] In the above-mentioned gas safety valve, the connecting portion includes a plurality of strip portions distributed around the center line of the sealing seat, the rear end of each strip portion is connected to the inner edge of the abutment portion, and each strip portion is curved in an arc shape toward the center line of the sealing seat.

[0014] The connecting portion is configured to include a plurality of strip-shaped portions distributed around the center line of the sealing seat, which neither affects the normal passage of the gas nor ensures a good deformation capacity.

[0015] In the above-mentioned gas safety valve, the valve body includes a front connecting body and a rear connecting body, the front end of the rear connecting body is threadedly connected to the rear end of the front connecting body, the front connecting body is provided with an annular stop surface, the front end of the sealing seat abuts against the annular stop surface, and the inner side of the rear end of the front connecting body is provided with an annular shoulder, and the abutting portion abuts between the sealing seat and the annular shoulder.

[0016] During assembly, first assemble the sealing body and the sealing seat together to form an over-current cut-off assembly, and then place the over-current cut-off assembly directly from the rear end of the front connector to the front end of the sealing seat and abut against the annular stop surface in the front connector. Then, the rear end of the front connector is riveted to form an annular shoulder and abut against the rear side of the abutment portion of the sealing body, thereby achieving the fixation of the abutment portion and the sealing seat along the front-to-back direction. Finally, the front end of the rear connector is threadedly connected to the rear end of the front connector.

[0017] In the above-mentioned gas safety valve, the sealing seat is provided with a plurality of limit heads protruding from its rear end surface and distributed around its center line, each limit head is located on the inner side of the abutment portion, and when the inner edge of the abutment portion abuts against the side of the limit head, there is a gap between the outer edge of the abutment portion and the inner wall of the valve body.

[0018] Because the abutting part and the sealing seat are fixed in the front-to-back direction, the elastic force of the connecting part acts on the sealing part in the front direction, which also has a pulling effect on the abutting part toward the center hole of the sealing seat. To this end, a plurality of limit heads protruding from the rear end surface of the sealing seat are provided, and each limit head is located at the inner side of the abutting part, so that the abutting part can be limited to prevent the elastic force of the connecting part from pulling the abutting part toward the center hole of the sealing seat and loosening it.

[0019] In the above-mentioned gas safety valve, a high-temperature cut-off component is provided in the rear connecting body.

[0020] By setting a high-temperature cut-off component in the rear connecting body, the gas passage can be cut off when the temperature of the valve body rises due to explosion or fire in the room, thereby cutting off the gas supply and avoiding more serious accidents such as secondary explosions.

[0021] In the above-mentioned gas safety valve, the high-temperature cut-off assembly includes a positioning bracket, a core, a spring and a limit pin. The positioning bracket is threadedly connected to the rear connecting body. The core includes a rod portion passing through the positioning bracket in the front-to-back direction and a head portion fixedly connected to the rear end of the rod portion. The limit pin is an alloy part. The limit pin is fixedly connected to the front end of the rod portion and the limit pin passes through the rod portion radially. The limit pin abuts against the front side of the positioning bracket. The two ends of the spring abut against the rear side of the positioning bracket and the front side of the head portion respectively. The front end opening of the air outlet is located directly behind the head portion, and there is a gap between the rear side surface of the head portion and the surface where the front end opening of the air outlet is located.

[0022] Under normal temperature conditions, the limit pin abuts against the front side of the positioning bracket. At this time, the spring is in a compressed state and there is a gap between the rear side of the head and the surface where the front end opening of the gas outlet is located. At this time, the gas can pass normally. When the temperature outside the valve body rises, the limit pin made of alloy will melt and lose the restriction on the spring. In this way, the spring will stretch and reset and drive the core to move backward. The head of the core will abut against the surface where the front end opening of the gas outlet is located and block the front end opening of the gas outlet, thereby cutting off the passage of the gas.

[0023] In the above-mentioned gas safety valve, the positioning bracket has a strip-shaped plate body and two arc-shaped and concentrically arranged sheet bodies, the two ends of the two sheet bodies are respectively connected to the two ends of the plate body, the outer sides of the two sheet bodies have external threads for threaded connection with the rear connecting body, the center of the plate body has a guide hole, the rod of the core passes through the guide hole, and the plate body also has connecting holes distributed on both sides of the guide hole and parallel to the guide hole.

[0024] The positioning bracket is threadedly connected in the rear connecting body through two sheet-like bodies, and the plate-like body of the positioning bracket is strip-shaped to ensure that the setting of the positioning bracket will not affect the normal supply of gas. The setting of the two connecting holes facilitates the rotation of the positioning bracket in cooperation with the tool.

[0025] Compared with the prior art, this gas safety valve has the following advantages:

[0026] 1. The sealing body is provided with a sealing part located in front of the sealing seat, a supporting part abutting against the rear side of the sealing seat, and a connecting part having elasticity and connected to the supporting part and the sealing part at both ends respectively. The supporting part and the sealing seat are fixed in the front-to-back direction to realize the positioning of the sealing body in the valve body, and the connecting part is used to provide the sealing part with elastic force to separate from the sealing seat. Therefore, the over-current cut-off function can be completely realized only by the setting of the sealing body and the sealing seat, thereby greatly simplifying the structure while realizing the over-current cut-off function;

[0027] 2. The connection part passes through the center hole of the sealing seat, which is equivalent to directly utilizing the center hole of the sealing seat for arrangement, thereby shortening the length of the entire overcurrent cut-off assembly, reducing the occupied space in the valve body, and making the length of the valve body smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the gas safety valve (when in the overcurrent cut-off state).

[0029] Figure 2 yes Figure 1 A partial enlarged view of the overcurrent cut-off component.

[0030] Figure 3 It is a three-dimensional schematic diagram of the rear side of the overcurrent cut-off component.

[0031] Figure 4 It is a three-dimensional schematic diagram of the sealing body.

[0032] Figure 5 It is a three-dimensional schematic diagram of the high temperature cut-off component.

[0033] Figure 6 It is a three-dimensional schematic diagram of the positioning bracket.

[0034] In the figure, 1, valve body; 1a, air inlet; 1b, air outlet; 2, over-current cut-off assembly; 3, sealing seat; 3a, limit head; 4, sealing body; 4a, sealing part; 4a1, sealing surface; 4b, abutment part; 4c, connecting part; 4c1, strip part; 5, front connecting body; 5a, annular stop surface; 5b, annular shoulder; 6, rear connecting body; 7, high-temperature cut-off assembly; 8, positioning bracket; 8a, plate-like body; 8a1, guide hole; 8a2, connecting hole; 8b, sheet-like body; 9, core; 9a, rod; 9b, head; 10, spring; 11, limit pin. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the gas safety valve comprises a valve body 1 having an air inlet 1a at the front end and an air outlet 1b at the rear end, the valve body 1 is of a straight-through type, and an over-current cut-off assembly 2 is arranged in the valve body 1. The over-current cut-off assembly 2 comprises a sealing seat 3 and a sealing body 4, the sealing seat 3 is in the shape of an annular block and is fixed in the valve body 1, the sealing body 4 is a rubber part, the sealing body 4 comprises a sealing portion 4a located in front of the sealing seat 3 and a supporting portion 4b abutting against the rear side of the sealing seat 3, the supporting portion 4b is in the shape of an annular sheet and is fixed to the sealing seat 3 in the front-to-back direction, the sealing body 4 also comprises a connecting portion 4c passing through the central hole of the sealing seat 3, the two ends of the connecting portion 4c are respectively connected to the supporting portion 4b and the sealing portion 4a, the connecting portion 4c is elastic and can be compressed when subjected to force in the front-to-back direction. In this embodiment, the valve body 1 includes a front connecting body 5 and a rear connecting body 6, the front end of the rear connecting body 6 is threadedly connected to the rear end of the front connecting body 5, the front connecting body 5 has an annular stop surface 5a, the front end of the sealing seat 3 abuts against the annular stop surface 5a, the inner side of the rear end of the front connecting body 5 has an annular stop shoulder 5b, and the abutting portion 4b abuts between the sealing seat 3 and the annular stop shoulder 5b. Among them, the sealing seat 3 is a plastic part, and the outer peripheral wall of the sealing seat 3 is tightly matched with the inner side wall of the front connecting body 5. During assembly, first assemble the sealing body 4 and the sealing seat 3 together to form the overcurrent cut-off component 2, and then directly insert the overcurrent cut-off component 2 from the rear end of the front connecting body 5 to the front end of the sealing seat 3 and abut against the annular stop surface 5a in the front connecting body 5, and then rivet the rear end of the front connecting body 5 to form an annular shoulder 5b and abut against the rear side of the abutment portion 4b of the sealing body 4, so that the abutment portion 4b and the sealing seat 3 are fixed in the front and rear directions, and finally the front end of the rear connecting body 6 is threadedly connected to the rear end of the front connecting body 5.

[0037] Specifically, Figure 2 , Figure 3 ,and Figure 4 As shown, the outer side of the sealing portion 4a has a conical sealing surface 4a1, and the outer diameter of the sealing surface 4a1 gradually decreases from front to back, and the aperture of the central hole of the sealing seat 3 is between the maximum outer diameter and the minimum outer diameter of the sealing surface 4a1. The sealing portion 4a is bowl-shaped, and the bowl mouth of the sealing portion 4a is arranged forward. The connecting portion 4c includes a plurality of strip portions 4c1 distributed around the center line of the sealing seat 3, and the rear end of each strip portion 4c1 is connected to the inner edge of the abutting portion 4b, and each strip portion 4c1 is curved in an arc shape toward the center line of the sealing seat 3. The sealing seat 3 is provided with a plurality of limit heads 3a protruding from its rear end surface and distributed around its center line, and each limit head 3a is located on the inner side of the abutting portion 4b, and when the inner edge of the abutting portion 4b abuts against the side of the limit head 3a, there is a gap between the outer edge of the abutting portion 4b and the inner side wall of the valve body 1.

[0038] Under normal use, the gas flow rate is not enough to make the sealing part 4a overcome the effect of the connecting part 4c. The sealing part 4a is in front of the sealing seat 3 under the elastic force of the connecting part 4c, and there is a gap between the sealing part 4a and the front end surface of the sealing seat 3, so the gas can pass normally. When the pipe falls off or leaks, the internal gas flow rate will suddenly increase, and the gas pressure will increase instantly, so that the force acting on the sealing part 4a exceeds the elastic force of the connecting part 4c. In this way, the sealing part 4a will squeeze the connecting part 4c to compress it and move the sealing part 4a backwards. The sealing seat 3 will eventually abut against the front end of the center hole of the sealing seat 3 and block it, thereby realizing the over-current cutoff (this state is as shown in FIG. 1). Figure 1 shown).

[0039] Furthermore, if Figure 1 , Figure 5 and Figure 6 As shown, a high temperature cut-off assembly 7 is also provided in the valve body 1, and the high temperature cut-off assembly 7 is located in the rear connector 6 of the valve body 1. The high temperature cut-off assembly 7 includes a positioning bracket 8, a core 9, a spring 10 and a limit pin 11. The positioning bracket 8 is threadedly connected in the rear connector 6. The core 9 includes a rod 9a passing through the positioning bracket 8 in the front-to-back direction and a head 9b fixedly connected to the rear end of the rod 9a. The limit pin 11 is an alloy part. The limit pin 11 is fixedly connected to the front end of the rod 9a and the limit pin 11 passes through the rod 9a in the radial direction. The limit pin 11 abuts against the front side of the positioning bracket 8. The two ends of the spring 10 abut against the rear side of the positioning bracket 8 and the front side of the head 9b respectively. The front end opening of the air outlet 1b is located directly behind the head 9b, and there is a gap between the rear side surface of the head 9b and the surface where the front end opening of the air outlet 1b is located. Specifically, the positioning bracket 8 has a strip-shaped plate-like body 8a and two arc-shaped and concentrically arranged sheet-like bodies 8b, the two ends of the two sheet-like bodies 8b are respectively connected to the two ends of the plate-like body 8a, and the outer sides of the two sheet-like bodies 8b have external threads for threaded connection with the rear connecting body 6. The center of the plate-like body 8a has a guide hole 8a1, and the rod portion 9a of the core 9 passes through the guide hole 8a1. The plate-like body 8a also has connecting holes 8a2 distributed on both sides of the guide hole 8a1 and parallel to the guide hole 8a1.

[0040] Under normal temperature conditions, the limit pin 11 abuts against the front side of the positioning bracket 8, at which time the spring 10 is in a compressed state and there is a gap between the rear side of the head 9b and the surface where the front end opening of the gas outlet 1b is located, and the gas can pass normally. When the temperature outside the valve body 1 rises, the limit pin 11, which is an alloy part, will melt and lose the restriction on the spring 10, so that the spring 10 will stretch and reset and drive the core 9 to move backward, and the head 9b of the core 9 will abut against the surface where the front end opening of the gas outlet 1b is located and block the front end opening of the gas outlet 1b, thereby cutting off the passage of the gas.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A gas safety valve, comprising a valve body (1) having an air inlet hole (1a) at the front end and an air outlet hole (1b) at the rear end, wherein an over-current cut-off assembly (2) is arranged in the valve body (1), characterized in that: The overcurrent cut-off assembly (2) comprises a sealing seat (3) and a sealing body (4); the sealing seat (3) is in the shape of an annular block and is fixed in the valve body (1); the sealing body (4) is a rubber part; the sealing body (4) comprises a sealing portion (4a) located in front of the sealing seat (3) and a supporting portion (4b) abutting against the rear side of the sealing seat (3); the supporting portion (4b) is in the shape of an annular sheet and is fixed to the sealing seat (3) in the front-to-back direction; the sealing body (4) further comprises a connecting portion (4c) passing through the central hole of the sealing seat (3); the two ends of the connecting portion (4c) are respectively connected to the supporting portion (4b) and the sealing portion (4a); the connecting portion (4c) is elastic and can be compressed when subjected to force in the front-to-back direction.

2. The gas safety valve according to claim 1, characterized in that: The outer side of the sealing portion (4a) has a conical sealing surface (4a1), the outer diameter of the sealing surface (4a1) gradually decreases from front to back, and the diameter of the central hole of the sealing seat (3) is between the maximum outer diameter and the minimum outer diameter of the sealing surface (4a1).

3. The gas safety valve according to claim 2, characterized in that: The sealing portion (4a) is bowl-shaped, and the mouth of the sealing portion (4a) is arranged to face forward.

4. The gas safety valve according to claim 1, 2 or 3, characterized in that: The connecting portion (4c) comprises a plurality of strip portions (4c1) distributed around the center line of the sealing seat (3), the rear end of each strip portion (4c1) being connected to the inner edge of the abutting portion (4b), and each strip portion (4c1) being curved in an arc shape toward the center line of the sealing seat (3).

5. The gas safety valve according to claim 1, characterized in that: The valve body (1) comprises a front connecting body (5) and a rear connecting body (6), the front end of the rear connecting body (6) is threadedly connected to the rear end of the front connecting body (5), the front connecting body (5) has an annular stop surface (5a), the front end of the sealing seat (3) abuts against the annular stop surface (5a), the inner side of the rear end of the front connecting body (5) has an annular stop shoulder (5b), and the abutting portion (4b) abuts between the sealing seat (3) and the annular stop shoulder (5b).

6. The gas safety valve according to claim 5, characterized in that: The sealing seat (3) is provided with a plurality of limit heads (3a) protruding from its rear end surface and distributed around its center line, each limit head (3a) is located on the inner side of the abutment portion (4b), and when the inner edge of the abutment portion (4b) abuts against the side of the limit head (3a), a gap exists between the outer edge of the abutment portion (4b) and the inner wall of the valve body (1).

7. The gas safety valve according to claim 5, characterized in that: A high-temperature cut-off component (7) is provided in the rear connecting body (6).

8. The gas safety valve according to claim 7, characterized in that: The high temperature cut-off assembly (7) comprises a positioning bracket (8), a core (9), a spring (10) and a limit pin (11); the positioning bracket (8) is threadedly connected to the rear connector (6); the core (9) comprises a rod (9a) passing through the positioning bracket (8) in the front-to-back direction and a head (9b) fixedly connected to the rear end of the rod (9a); the limit pin (11) is an alloy part; the limit pin (11) is fixedly connected to the front end of the rod (9a) and passes through the rod (9a) in the radial direction; the limit pin (11) abuts against the front side of the positioning bracket (8); the two ends of the spring (10) abut against the rear side of the positioning bracket (8) and the front side of the head (9b) respectively; the front end opening of the air outlet (1b) is located directly behind the head (9b); and there is a gap between the rear side surface of the head (9b) and the surface where the front end opening of the air outlet (1b) is located.

9. The gas safety valve according to claim 8, characterized in that: The positioning bracket (8) comprises a strip-shaped plate-like body (8a) and two arc-shaped and concentrically arranged sheet-like bodies (8b), the two ends of the two sheet-like bodies (8b) are respectively connected to the two ends of the plate-like body (8a), the outer sides of the two sheet-like bodies (8b) have external threads for threaded connection with the rear connecting body (6), the center of the plate-like body (8a) has a guide hole (8a1), the rod portion (9a) of the core (9) passes through the guide hole (8a1), and the plate-like body (8a) also has connecting holes (8a2) distributed on both sides of the guide hole (8a1) and parallel to the guide hole (8a1).

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