CN216200919U

CN216200919U - Gas anti-overflow safety device

Info

Publication number: CN216200919U
Application number: CN202122751336.XU
Authority: CN
Inventors: 赵红军
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-11-10
Filing date: 2021-11-10
Publication date: 2022-04-05
Anticipated expiration: 2031-11-10

Abstract

The utility model provides a gas anti-overflow safety device, and belongs to the technical field of gas safety equipment. The problem that the existing gas anti-overflow valve is unstable in use is solved. The utility model provides a gas prevents excessive flow safety device includes mount pad and case, case one end is provided with umbrella-shaped portion, the cover is equipped with the spring that can let umbrella-shaped portion move towards the direction axial that is close to the mount pad other end on the case other end, mount pad open end joint has the valve gap, the valve gap inboard is equipped with the direction conical surface and the sealed conical surface in proper order along the direction opposite with the spring effort, the sealed conical surface is connected with the direction conical surface, the biggest internal diameter of sealed conical surface equals the minimum internal diameter of the direction conical surface, and the tapering of the sealed conical surface is less than the tapering of the direction conical surface, be provided with the sealing washer one that can support with the sealed conical surface in the umbrella-shaped portion, the biggest external diameter of sealing washer one is less than the biggest internal diameter of the direction conical surface and is greater than the biggest internal diameter of sealed conical surface. This gas prevents overflowing safety device possesses advantages such as stability is good, the leakproofness is strong.

Description

Gas anti-overflow safety device

Technical Field

The utility model belongs to the technical field of gas safety equipment, and particularly relates to a gas anti-overflow safety device.

Background

The gas pipeline is closely related to the daily life of people, wherein the gas valve is a gas appliance and a matched component in the gas pipeline, so that more and more natural gas, coal gas, liquefied gas and the like are used by families at present, convenience is brought to the life of people, meanwhile, some potential safety hazards also exist, and in the using process, a gas rubber pipe is often aged and falls off, and gas leakage occurs; if the gas source is not found and cut off in time, dangerous accidents such as gas poisoning, fire hazard, explosion and the like can happen, and serious harm is brought to the life and property of people.

In order to avoid the situations, the utility model provides a gas valve with application number of CN201822061807.2, which comprises a liquefied petroleum gas pressure regulator or a pipeline gas stove front valve, an overflowing device and an overflowing resetting device, wherein the overflowing device comprises an overflowing base, an umbrella-shaped overflowing sheet, an overflowing shell, an overflowing spring and a clamp spring, the overflowing resetting device comprises a manual overflowing sleeve, an overflowing column, an O-shaped ring, a resetting spring and a manual overflowing cover, and the overflowing device and the overflowing resetting device can be used in a matched mode.

Although the gas valve can solve the problem of automatically cutting off the gas, the gas valve has the following defects: when the air pressure in the gas pipeline suddenly exceeds the air pressure in the gas valve assembly in the use process, the air flow can push the umbrella-shaped overflowing sheet to abut against the overflowing hole at the right end of the overflowing shell to realize the gambling, but the air pressure in the gas pipeline fluctuates again in the mode of abutting against to realize 'gas cut-off', and when the air pressure in the gas pipeline is smaller than or equal to the air pressure in the gas valve assembly, the spring can generate the spring force which enables the umbrella-shaped overflowing sheet to be far away from the valve cover, so that the umbrella-shaped overflowing sheet can abut against the unstable condition after the process of overflowing the gambling hole, and the air leakage phenomenon is easily generated.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, provides a gas anti-overflow safety device, and solves the problem that the existing gas anti-overflow valve is unstable to use.

The purpose of the utility model can be realized by the following technical scheme:

the gas anti-overflow safety device comprises an installation base with an opening at one end and a valve core penetrating through the other end of the installation base, wherein an umbrella-shaped portion is arranged at one end of the valve core, a spring capable of enabling the umbrella-shaped portion to axially move towards the direction close to the other end of the installation base is sleeved at the other end of the valve core, the opening end of the installation base is connected with a valve cover, a guide conical surface and a sealing conical surface are sequentially arranged on the inner side of the valve cover along the direction opposite to the action force of the spring, the sealing conical surface is connected with the guide conical surface, the maximum inner diameter of the sealing conical surface is equal to the minimum inner diameter of the guide conical surface, the taper of the sealing conical surface is smaller than that of the guide conical surface, a first sealing ring capable of being abutted against the sealing conical surface is arranged on the outer peripheral surface of the umbrella-shaped portion, and the maximum outer diameter of the first sealing ring is smaller than the maximum inner diameter of the guide conical surface and larger than the maximum inner diameter of the sealing conical surface.

The gas anti-overflow safety device is installed in the gas outlet end of a gas valve assembly, and is communicated with a gas pipeline, in an initial state, the valve cover is connected to the opening of the mounting seat in a clamping mode, the umbrella-shaped portion at one end of the valve core is located in the mounting seat, the other end of the valve core extends out of the mounting seat, when the gas normally circulates, the umbrella-shaped portion on the valve core is abutted to the inner wall of the non-opening end of the mounting seat under the action force of the spring, the umbrella-shaped portion is kept away from the sealing conical surface, so that the gas can flow into the mounting seat from one end of the valve cover and then flows into the gas pipeline from the inside of the mounting seat, and normal circulation of the gas is achieved. When the air pressure in the gas pipeline changes suddenly, namely under the condition that the air pressure in the pipeline is greater than the air pressure in the gas valve assembly, the gas in the pipeline acts on the umbrella-shaped part to push the umbrella-shaped part, the umbrella-shaped part drives the valve core to overcome the spring force of the spring and move axially towards the valve cover, under the action of the guide conical surface, the sealing ring approaches towards the sealing conical surface for a while, and the sealing conical surface is connected with the guide conical surface, and the maximum outer diameter of the first sealing ring is smaller than the maximum inner diameter of the guide conical surface and is greater than the maximum inner diameter of the sealing conical surface, so that the first sealing ring is extruded into the sealing conical surface and abuts against the sealing conical surface, and interference or excessive matching is formed between the first sealing ring and the sealing conical surface. Through the arrangement of the double conical surfaces of the sealing conical surface and the guiding conical surface and the arrangement that the maximum inner diameter of the sealing conical surface is equal to the minimum diameter of the guiding conical surface, the first sealing ring can be more quickly and accurately and directly extruded into the sealing conical surface under the guiding of the guiding conical surface, meanwhile, because the maximum outer diameter of the first sealing ring is smaller than the maximum inner diameter of the guiding conical surface and larger than the maximum inner diameter of the sealing conical surface, the first sealing ring is abutted against the sealing conical surface to form a strand of tension, the first sealing ring can be extruded into the sealing conical surface, so that interference or excessive fit is formed between the first sealing ring and the sealing conical surface, the first sealing ring can be more tightly and firmly attached into the sealing conical surface, when the air pressure in the gas pipeline fluctuates again, namely the air pressure in the gas pipeline is equal to or smaller than the air pressure in the gas valve assembly, the valve core can be always kept clamped in the sealing conical surface through the action of the tension of the sealing ring, the valve core can not be loosened due to spring force, so that the air leakage phenomenon can not occur, the sealing ring can be always attached to the sealing conical surface in the valve cover to form sealing, and the stability of the gas anti-overflow safety device in use is improved.

The double conical surfaces arranged on the gas anti-overflow safety device are compared with the single conical surfaces in the conventional technology: if the taper of the single conical surface in the conventional technology is the same as that of the guide conical surface, the position of the first sealing ring abutted against the conical surface is a position above the peripheral surface of the first sealing ring, and the first sealing ring cannot be extruded into the conical surface due to a downward elastic force generated by the elastic force of the first sealing ring; if the taper of the single conical surface in the conventional technology is the same as that of the sealing conical surface, the length of the single conical surface needs to be increased, so that the single conical surface also has a guiding effect, but the whole part is lengthened, the cost is increased, and the volume is increased. Therefore, the double conical surfaces arranged on the gas anti-overflow safety device can not only enable the sealing ring to be extruded into the conical surface stably and firmly, but also have the guiding function of enabling the sealing ring to be extruded into the sealing conical surface rapidly and accurately under the condition that the length of the whole part does not need to be changed.

In the gas anti-overflow safety device, the first sealing groove is further formed in the outer peripheral surface of the umbrella-shaped portion, and the first sealing ring is arranged in the first sealing groove.

Through installing sealing washer one to sealing groove one in can make a sealing washer axial and radial spacing, thereby prevent that a sealing washer drunkenness from influencing sealed effect, lean on sealed conical surface formation through sealing washer one moreover and sealed ability reducing wear, further improvement sealed effect.

In foretell a gas anti-overflow safety device, the mount pad include the collar and along the branch that the collar axial direction set up, branch one end links firmly with the collar mutually, the collar that is provided with along circumference around the collar in the collar, be provided with on the valve gap and have elastic installation department, the conical surface is personally submitted to the installation department periphery, the diameter of conical surface is by little grow towards the mount pad direction, the installation department is located the collar and leans on with branch one end counterbalance, the conical surface leans on with the collar counterbalance and forms sealed fixed.

When the installation valve gap, aim at the opening part of installation department with the valve gap earlier, then insert the mount pad with the valve gap, when the conical surface on the installation department leans on with the rand counterbalance, the rand can extrude the installation department makes its deformation, thereby the external diameter of installation department diminishes, make in the installation department extrudes the installation department intra-annular, because the installation department periphery is the conical surface, and the diameter of conical surface leans on from little grow towards the mount pad direction, so continue deep back, the biggest department of installation department conical surface diameter can be owing to lose the support of rand and lean on, thereby rebound to initial state, it is fixed to realize that the installation department card goes into the intra-annular formation of installation department, finally the bottom of until the installation department offsets with the one end of branch and leans on, thereby accomplish the installation of valve gap, through the installation department, the collar, the setting of rand, make the valve gap installation to the mount pad top convenient and fast, and high installation efficiency is improved.

In an above-mentioned gas anti-overflow safety device, the other end of the supporting rod is connected with a buckle with elasticity, and the other end of the supporting rod is further provided with a position-giving part which can make the buckle deform inwards after being extruded.

At the case, the valve gap, the mount pad, the spring mounting finishes the back, need prevent this gas and cross flow safety device and install to the gas valve assembly in, be provided with in the gas valve assembly with buckle assorted draw-in groove, so when preventing this gas and cross flow safety device and insert the gas valve assembly in, the buckle can lean on with the counterbalance of gas valve assembly inner wall, owing to let the setting of position portion, so the buckle that is connected with branch can be extruded, until when buckle and draw-in groove looks parallel and level, the buckle can kick-back to initial condition, thereby the card is gone into in the draw-in groove, accomplish the installation up to this time. Through setting up such as buckle, let position portion, draw-in groove for this gas is prevented overflowing safety device and is installed convenient and fast more to gas valve assembly in.

In the above safety device for preventing the gas from flowing over, the mounting seat further comprises a fixed seat connected with the supporting rod, and a through hole for the valve core to pass through is formed in the fixed seat.

Under the normal circulation of gas, namely the initial state of the gas anti-overflow installation device, the umbrella-shaped part at one end of the valve core can be abutted against and fixed under the action of the spring, and the rod-shaped part at the other end of the valve core can penetrate through the through hole and extend out of the installation seat.

In the gas anti-overflow safety device, the outer peripheral surface of the valve cover is further provided with a second sealing groove, and a second sealing ring is arranged in the second sealing groove.

After the gas anti-overflow safety device is installed in the gas valve assembly, the second sealing groove is further formed in the outer peripheral surface of the valve cover, and the second sealing ring is arranged in the second sealing groove, so that the second sealing ring can abut against the sealing groove and the inner wall of the gas valve assembly to form sealing, and leakage of gas is prevented under the condition of 'gas cutoff' of the gas anti-overflow safety device.

In the gas anti-overflow safety device, one end of the valve core, which extends out of the valve cover, is clamped with a limiting ring, and the spring is abutted between the limiting ring and the fixed seat.

The spring is sleeved on the valve core and arranged between the limiting ring and the fixing seat, so that in an initial state, the spring can abut against the limiting ring to form a strand of axial movement in the direction which enables the valve core to be far away from the valve cover, and the umbrella-shaped portion abuts against the fixing seat (namely, the gas anti-overflow safety device is in a state of normal gas circulation).

Compared with the prior art, this flow safety device is prevented to gas passes through the biconical surface setting of sealed conical surface and the conical surface of direction, when "disconnected gas" state, after the atmospheric pressure in the gas pipeline appears undulant once more, when the atmospheric pressure equals or is less than the atmospheric pressure in the gas valve assembly in the gas pipeline promptly, the case can remain the card all the time in sealed conical surface through the effect of tension, thereby the case just can not produce not hard up the emergence and produce gas leakage phenomenon because of the reason of spring force, guarantee that the sealing washer can paste tightly mutually with the sealed conical surface in the valve gap always and form sealedly, stability when this flow safety device is prevented to gas's use has been improved.

Drawings

FIG. 1 is a cross-sectional view of the present gas anti-overflow safety device in a gas-off state;

FIG. 2 is a sectional view of the gas flow-through preventing safety device in a normal gas flow state;

FIG. 3 is an exploded view of the present gas anti-overflow safety device;

FIG. 4 is a cross-sectional view of the present gas anti-over flow safety device installed in a gas valve assembly in a gas-off condition;

fig. 5 is a sectional view showing the normal gas flow state after the gas anti-overflow safety device is installed in the gas valve assembly.

In the figure, 1, a gas valve assembly; 1a, a clamping groove; 2. a mounting seat; 2a, a mounting ring; 2a1, collar; 2b, a support rod; 2b1, snap; 2b2, a yield part; 2c, fixing a base; 2c1, vias; 3. a valve core; 3a, an umbrella-shaped portion; 3a1, annular groove; 3a2, seal groove one; 3b, a raised head; 4. a first sealing ring; 5. a valve cover; 5a, a guide conical surface; 5b, sealing the conical surface; 5c, an installation part; 5d, sealing the groove II; 6. a spring; 7. a second sealing ring; 8. a limiting ring; 9. a sphere; 10. a valve stem.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-3, a gas over-flow prevention safety device comprises a mounting seat 2 with an opening at one end and a valve core 3 penetrating through the other end of the mounting seat 2, wherein a spring 6 capable of axially moving the valve core 3 is sleeved on the outer peripheral surface of the other end of the valve core 3, specifically, one end of the valve core 3 extending out of a valve cover 5 is clamped with a limiting ring 8, the spring 6 is abutted between the limiting ring 8 and a fixed seat 2c, and the valve cover 5 is clamped at the opening end of the mounting seat 2, when the device is installed, the valve core 3 which is not clamped with the limiting ring 8 is firstly installed in the mounting seat 2, and the valve core 3 is made to pass through a through hole 2c1 on the fixed seat 2c, so that one end of the valve core 3 penetrates out of the mounting seat 2, then the spring 6 is sleeved at one end penetrating out of the valve core 3, one end of the spring 6 is abutted on the mounting seat 2, after the sleeving is completed, the limiting ring 8 is clamped on the valve core 3, so that the other end of the spring 6 is abutted on the limiting ring 8, thereby accomplish the fixed mounting of spring 6, because spring 6 power that spring 6 acted on case 3 for umbrella-shaped portion 3a on case 3 supports and leans on fixing base 2c, when promotion case 3 made umbrella-shaped portion 3a on case 3 towards the one end axial displacement of mount pad 2 opening part, spacing ring 8 can extrude spring 6, after loosening the thrust that exerts on case 3, the spring 6 power of spring 6 makes case 3 kick-back to initial position on acting on spacing ring 8.

As shown in fig. 1-3, further, the mounting seat 2 includes a mounting ring 2a and a supporting rod 2b disposed along an axial direction of the mounting ring 2a, one end of the supporting rod 2b is fixedly connected to the mounting ring 2a, a collar 2a1 is disposed along a circumferential direction on an inner circumferential surface of the mounting ring 2a, an elastic mounting portion 5c is disposed on the valve cover 5, an outer circumferential surface of the mounting portion 5c is a tapered surface, the tapered surface abuts against the collar 2a1 to form a sealing fixation, specifically, when the valve cover 5 is mounted, the valve cover 5 is aligned with an opening of the mounting portion 5c, then the valve cover 5 is inserted into the mounting seat 2, when the tapered surface on the mounting portion 5c abuts against the collar 2a1, the collar 2a1 presses the mounting portion 5c to deform the mounting portion, so that an outer diameter of the mounting portion 5c is reduced, so that the mounting portion 5c is squeezed into the mounting ring 2a, because a diameter of the tapered surface of the mounting portion 5c is increased toward the mounting seat 2, after the valve cover 5 is further extended, the part with the largest diameter of the conical surface of the mounting part 5c is rebounded to the initial state due to the fact that the abutting of the clamping ring 2a1 is lost, the mounting part 5c is clamped into the mounting ring 2a to be fixed, and finally the bottom of the mounting part 5c abuts against one end of the supporting rod 2b, and therefore the valve cover 5 is mounted.

Further, as shown in fig. 1-3, one end of the valve core 3 is provided with an umbrella-shaped portion 3a, the umbrella-shaped portion 3a is provided with an annular groove 3a1, the upper outer peripheral surface of the umbrella-shaped portion 3a is further provided with a first sealing groove 3a2, the first sealing ring 4 is arranged in the first sealing groove 3a2, the first sealing ring 4 is mounted in the first sealing groove 3a2 so that the first sealing ring 4 can be limited axially and radially, the first sealing ring 4 is prevented from moving, the sealing effect is affected, the first sealing ring 4 abuts against the sealing conical surface 5b to form sealing, abrasion can be reduced, and the sealing effect is further improved.

Furthermore, as shown in fig. 4-5, the gas over-flow prevention safety device is installed in the gas outlet end of the gas valve assembly 1, and the gas over-flow prevention safety device is communicated with the gas pipeline, when the valve core 3, the spring 6 and the valve cover 5 are all installed, the gas over-flow prevention safety device needs to be installed in the gas valve assembly 1, since the other end of the supporting rod 2b is connected with the elastic buckle 2b1, the other end of the supporting rod 2b is also provided with the yielding part 2b2 capable of allowing the buckle 2b1 to deform inwards after being squeezed, the inside of the gas valve assembly 1 is provided with the clamping groove 1a clamped with the buckle 2b1, when the gas over-flow prevention safety device is inserted into the gas valve assembly 1, the buckle 2b1 will abut against the inner wall of the gas valve assembly 1, and since the yielding part 2b2 is provided, the buckle 2b1 connected with the supporting rod 2b will be squeezed, until buckle 2b1 and draw-in groove 1a when being parallel and level mutually, buckle 2b1 can kick-back to initial condition to in the card goes into draw-in groove 1a, accomplish the installation so far. Meanwhile, the outer peripheral surface of the valve cover 5 is further provided with a second sealing groove 5d, and a second sealing ring 7 is arranged in the second sealing groove 5d, so that the second sealing ring 7 can abut against between the sealing groove and the inner wall of the gas valve assembly 1 to form sealing, and leakage of gas is prevented from being generated under the condition of gas cut-off of the gas anti-overflow mounting device.

As shown in fig. 4-5, further, a valve rod 10 is further disposed on the gas valve assembly 1, a ball 9 is disposed at one end of the valve rod 10, when the gas anti-overflow safety device is to be reset after "gas cut", because the first sealing ring 4 is interference fit or over fit to the sealing conical surface 5b, the valve core 3 and the valve cover 5 are in a stuck state, the valve core 3 cannot move to an initial position by the force of the spring 6 itself, and a protruding head 3b is disposed at one end of the valve core 3 where the umbrella-shaped portion 3a is disposed, so that when the valve core 3 needs to be reset after the gas pipeline pressure is normal, the valve rod 10 is only rotated, the valve rod 10 drives the ball valve to rotate, during the rotation of the ball valve, the outer diameter of the ball valve will abut against the protruding head 3b on the valve core 3, and after the ball valve continues to rotate, the ball valve will gradually push the valve core 3, so that the valve core 3 moves axially toward a side away from the valve cover 5, therefore, the first sealing ring 4 is separated from the sealing conical surface 5b, the clamping state between the valve core 3 and the valve cover 5 is relieved, and then the valve core 3 can reset under the action of the force of the spring 6.

As shown in fig. 1-5, in an initial state, the valve cap 5 is clamped at an opening of the mounting seat 2, the umbrella-shaped portion 3a at one end of the valve core 3 is located in the mounting seat 2, and the other end of the valve core extends out of the mounting seat 2, when the gas normally circulates, the umbrella-shaped portion 3a on the valve core 3 is abutted against the fixed seat 2c under the action of the spring 6, so that the umbrella-shaped portion 3a is far away from the sealing conical surface 5b, and the gas can flow into the mounting seat 2 from one end of the valve cap 5 and then flow into a gas pipeline from the inside of the mounting seat, thereby realizing the normal circulation of the gas. When the air pressure in the gas pipeline changes suddenly, that is, under the condition that the air pressure in the pipeline is greater than the air pressure in the gas valve assembly 1, the gas in the pipeline acts on the annular groove 3a1 to push the umbrella-shaped portion 3a, the umbrella-shaped portion 3a drives the valve core 3 to move axially towards the valve cover 5 against the force of the spring 6, the sealing ring one 4 approaches towards the sealing conical surface 5b under the action of the guiding conical surface 5a, and because the sealing conical surface 5b is connected with the guiding conical surface 5a, and the maximum outer diameter of the sealing ring one 4 is smaller than the maximum inner diameter of the guiding conical surface 5a and larger than the maximum inner diameter of the sealing conical surface 5b, the sealing ring one 4 can be extruded into the sealing conical surface 5b to abut against the sealing conical surface 5b, so that interference or over-fit is formed between the sealing ring one 4 and the sealing conical surface 5 b. Through the arrangement of the double conical surfaces of the sealing conical surface 5b and the guide conical surface 5a, and the arrangement that the maximum inner diameter of the sealing conical surface 5b is equal to the minimum diameter of the guide conical surface 5a, the sealing ring I4 can be more quickly and accurately extruded into the sealing conical surface 5b under the guide of the guide conical surface 5a, meanwhile, as the maximum outer diameter of the sealing ring I4 is smaller than the maximum inner diameter of the guide conical surface 5a and larger than the maximum inner diameter of the sealing conical surface 5b, the sealing ring I4 can form a tensile force after being abutted against the sealing conical surface 5b, the sealing ring I4 can be extruded into the sealing conical surface 5b, so that interference or excessive fit is formed between the sealing ring I4 and the sealing conical surface 5b, the sealing ring I4 can be attached into the sealing conical surface 5b more tightly and firmly, when the air pressure in the gas pipeline fluctuates again, namely the air pressure in the gas pipeline is equal to or smaller than the air pressure in the gas valve assembly 1, valve core 3 can keep the card all the time in sealed conical surface 5b through the effect of 4 tension on sealing washer, thereby valve core 3 just can not produce not hard up the emergence and leak gas the phenomenon because of the reason of 6 power of spring, guarantees that the sealing washer can paste tightly mutually with the sealed conical surface 5b in the valve gap 5 always and form sealedly, stability when having improved this gas and having prevented overflow safety device's use.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. A gas anti-overflow safety device comprises an installation base (2) with an opening at one end and a valve core (3) penetrating through the other end of the installation base (2), wherein one end of the valve core (3) is provided with an umbrella-shaped part (3a), the other end of the valve core (3) is sleeved with a spring (6) which can enable the umbrella-shaped part (3a) to axially move towards the direction close to the other end of the installation base (2), the gas anti-overflow safety device is characterized in that the opening end of the installation base (2) is clamped with a valve cover (5), the inner side of the valve cover (5) is sequentially provided with a guide conical surface (5a) and a sealing conical surface (5b) along the direction opposite to the acting force of the spring (6), the sealing conical surface (5b) is connected with the guide conical surface (5a), the maximum inner diameter of the sealing conical surface (5b) is equal to the minimum inner diameter of the guide conical surface (5a), and the conicity of the sealing conical surface (5b) is smaller than that of the guide conical surface (5a), the outer peripheral surface of the umbrella-shaped portion (3a) is provided with a first sealing ring (4) capable of abutting against the sealing conical surface (5b), and the maximum outer diameter of the first sealing ring (4) is smaller than the maximum inner diameter of the guiding conical surface (5a) and larger than the maximum inner diameter of the sealing conical surface (5 b).

2. The gas anti-overflow safety device of claim 1, wherein the outer periphery of the umbrella-shaped portion (3a) is further provided with a first sealing groove (3a2), and the first sealing ring (4) is arranged in the first sealing groove (3a 2).

3. The gas anti-overflow safety device of claim 2, wherein the mounting seat (2) comprises a mounting ring (2a) and a support rod (2b) arranged along the axial direction of the mounting ring (2a), one end of the support rod (2b) is fixedly connected with the mounting ring (2a), a clamping ring (2a1) is arranged on the inner circumferential surface of the mounting ring (2a) along the circumferential direction, an elastic mounting portion (5c) is arranged on the valve cover (5), the outer circumferential surface of the mounting portion (5c) is a conical surface, the diameter of the conical surface is gradually increased towards the mounting seat (2), the mounting portion (5c) is located in the mounting ring (2a) and abuts against one end of the support rod (2b), and the conical surface abuts against the clamping ring (2a1) to form sealing fixation.

4. The gas anti-overflow safety device of claim 3, wherein the other end of the supporting rod (2b) is connected with a buckle (2b1) with elasticity, and the other end of the supporting rod (2b) is further provided with a yielding part (2b2) which can enable the buckle (2b1) to deform inwards after being squeezed.

5. The gas anti-overflow safety device of claim 3 or 4, characterized in that the mounting seat (2) further comprises a fixing seat (2c) connected with the support rod (2b), and the fixing seat (2c) is provided with a through hole (2c1) for the valve core (3) to pass through.

6. The gas anti-overflow safety device of claim 1, 2, 3 or 4, wherein a second sealing groove (5d) is further formed in the outer peripheral surface of the valve cover (5), and a second sealing ring (7) is arranged in the second sealing groove (5 d).

7. The gas anti-overflow safety device of claim 5, characterized in that, the end of the valve core (3) extending out of the valve cover (5) is provided with a limit ring (8) in a clamping manner, and the spring (6) is abutted between the limit ring (8) and the fixed seat (2 c).