CN220646887U

CN220646887U - Gas check valve

Info

Publication number: CN220646887U
Application number: CN202322141075.9U
Authority: CN
Inventors: 李德松; 郑志勇; 王盛; 吴如杰
Original assignee: Zhejiang Best And Honest Electromechanics Co ltd
Current assignee: Zhejiang Best And Honest Electromechanics Co ltd
Priority date: 2023-08-09
Filing date: 2023-08-09
Publication date: 2024-03-22
Anticipated expiration: 2033-08-09

Abstract

The utility model provides a gas check valve, and belongs to the technical field of gas. The gas burner solves the problem that the gas can not be stably supplied to the burner while the safety is improved. The valve body comprises a valve body, wherein the left end is an air inlet end, the right end is an air outlet end, an annular propping part is arranged in the valve body, a support which is positioned on the left side of the annular propping part is connected with an inner thread of the valve body, a non-return component is connected with the support in a sliding manner along the left-right direction, the non-return component comprises a core and a spring, the core is provided with a rod body penetrating through the support and a head fixedly connected with the right end of the rod body, the head is positioned on the right side of the annular propping part, the spring is sleeved on the rod body, the two ends of the spring are propped against the support and the head respectively, the head is fixedly connected with a sealing gasket, the rod body overcomes the spring force to move leftwards, the sealing gasket can prop against the right side of the annular propping part to form a seal, and the left end of the rod body is fixedly connected with a baffle ring which can prop against the support when the rod body moves rightwards. It has the advantages of effectively preventing flame from returning into the gas pipeline, stably supplying gas to the burner, etc.

Description

Gas check valve

Technical Field

The utility model belongs to the technical field of fuel gas, and relates to a fuel gas check valve.

Background

At present, urban gas pipelining in China is common, such as pipeline gas, pipeline natural gas, pipeline liquefied gas and the like. When the burner is not used, backfire phenomenon can occur, and if flame cannot be prevented from being reflected into the gas pipeline in time, explosion and other phenomena can be easily caused. In order to prevent flame from being reflected into the gas pipeline, the Chinese patent publication No. 93240149.X discloses a check valve, which is sleeved with a valve seat with internal threads at one end of a seat ring, a valve plate with gas channels at the periphery is abutted with the other side of the valve seat, the position of the gas channels corresponds to the valve seat, and a spring is pressed between the other side of the valve body and a gas conduit sleeved on the valve seat and the seat ring. When the gas-saving seat is used, the seat ring is connected with a gas pipeline, the gas conduit is connected to a tool or a burner, under the normal state, gas flows in from the middle hole of the seat ring, the valve plate compresses the spring under the action of gas pressure, and the valve plate is separated from the valve seat, so that the gas flows into the cavity of the gas conduit from the gas channel and then flows out from the cavity of the gas conduit; when backfire occurs, the pressure generated by gas combustion and the pressure of the spring reversely push the valve plate to be in contact with the valve seat again, so that the gas channel is sealed by the valve seat, and the reverse flow of gas is completely prevented.

However, in practice, the gas pressure in the gas pipe is relatively low, and when the gas is supplied to the burner via the check valve, the valve plate is pushed by the gas pressure to separate from the valve seat against the elastic force of the compression spring pad, so that a part of the gas pressure is absorbed by the compression spring, and insufficient pressure is easily caused to be supplied to the burner, resulting in insufficient combustion at the burner. In addition, when the pressure in the gas pipe fluctuates, there may be a case where the gas pressure is insufficient to push the valve plate. Therefore, the check valve prevents the flame from returning to the gas pipe, but has a problem in that the gas cannot be stably supplied to the burner.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a gas check valve which solves the problems that the safety is improved and the gas cannot be stably supplied to a burner.

The aim of the utility model can be achieved by the following technical scheme:

the gas check valve comprises a valve body, wherein the left end of the valve body is an air inlet end, and the right end of the valve body is an air outlet end, the gas check valve is characterized in that an annular propping part is arranged in the valve body, a support which is positioned on the left side of the annular propping part is connected with the valve body in a threaded manner, a check assembly is connected with the support in a sliding manner along the left-right direction, the check assembly comprises a core and a spring, the core is provided with a rod body penetrating through the support and a head fixedly connected with the right end of the rod body, the head is positioned on the right side of the annular propping part, the spring is sleeved on the rod body, the two ends of the spring are respectively propped against the support and the head, the head is fixedly connected with a sealing gasket, the sealing gasket can prop against the right side of the annular propping part when the rod body moves leftwards against the spring force, and the left end of the rod body is fixedly connected with a baffle ring which can prop against the support when the rod body moves rightwards.

The gas check valve is used on a gas stove and is mainly used for preventing fire from returning into a gas pipeline to cause explosion when a tempering phenomenon occurs. Under normal state, the body of rod is in the position that makes sealed pad keep away from annular portion of leaning on under the effect of spring, and annular portion's that leans on central hole is in the open state this moment, and the inside intercommunication state that is in of inlet end and outlet end inside makes the gas pass through smoothly, and this gas check valve is in normally open state that is said, and gas does not need to rely on self pressure to push open sealed pad when passing through, can ensure the steady supply of gas like this. When tempering occurs, the pressure of the air outlet end is larger than that of the air inlet end, and the core moves leftwards against the elastic action of the spring at the moment, so that the sealing gasket is abutted against the right side surface of the annular abutting part, and the right end orifice of the central hole of the annular abutting part is blocked, thereby preventing gas tempering. Through the arrangement, the gas check valve is normally opened in a normal state and is closed only when the gas appliance is in a backfire state, so that the effect of preventing flame from returning into the gas pipeline is achieved, and meanwhile, the normal supply of gas is not influenced and the situation that a part of gas pressure is counteracted by the spring is avoided due to the fact that the gas check valve is in the normally opened state, so that the stable supply of gas to the gas appliance is ensured.

In the above-mentioned gas check valve, the support include the go-between, be located the go-between inboard and rather than concentric guide post that sets up and a plurality of branch that link firmly between guide post and go-between, the guide post is equipped with the through-hole that supplies the body of rod to pass along left and right directions, the baffle ring is located the left side of guide post, the left end of spring supports and leans on the right-hand member of guide post.

In the above gas check valve, the core is a plastic part, the left end of the rod body is provided with two elastic clamping flaps which are arranged around the center line of the rod body and are arranged oppositely, a yielding gap is arranged between every two adjacent elastic clamping flaps, the baffle ring is sleeved outside each elastic clamping flap, and the left end of each elastic clamping flap is provided with a shoulder for preventing the baffle ring from falling off.

In the fuel gas check valve, the right end opening of the baffle ring is in an outward expansion shape.

The right port of the baffle ring is arranged to be in an outward expansion shape, so that the elastic clamping valve with the shoulder at the left end part can conveniently pass through the center hole of the baffle ring.

In the fuel gas check valve, the left end of the guide post is hexagonal.

The connecting ring is annular and can not be matched with a tool to operate, so that the left end of the guide post is arranged to be hexagonal, and therefore a position can be provided for clamping the support by the tool, and a worker can conveniently install or detach the support.

In the above gas check valve, the right side surface of the sealing gasket is provided with a sealing flange, and the left side surface of the sealing flange is an outer convex arc surface.

Compared with the prior art, the gas check valve is arranged through the annular abutting part, the support and the check assembly, so that the gas check valve is normally opened in a normal state and is closed only when a backfire condition occurs in the gas appliance, the effect of preventing flame from returning into a gas pipeline is achieved, and meanwhile, the normal supply of gas is not influenced and the situation that a part of gas pressure is counteracted by a spring due to the fact that the gas check valve is normally opened is avoided, and the stable supply of gas to the gas appliance is ensured.

Drawings

Fig. 1 is a cross-sectional view of the present gas check valve.

Fig. 2 is a partial enlarged view at a in fig. 1.

Fig. 3 is a schematic structural view of the bracket in the fuel gas check valve.

Fig. 4 is a schematic structural view of the core in the present gas check valve.

In the figure, 1, a valve body; 1a, an air inlet; 1b, an air outlet; 1c, an annular abutting part; 2. a bracket; 2a, a connecting ring; 2b, guide posts; 2b1, through holes; 2c, supporting rods; 3. a core; 3a, a rod body; 3a1, elastic clamping flaps; 3a11, a shoulder; 3a2, a yielding gap; 3b, head; 4. a spring; 5. a baffle ring; 6. a sealing gasket; 6a, sealing flanges.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

As shown in fig. 1, the gas check valve comprises a valve body 1, wherein the left end is an air inlet end, the right end is an air outlet end, an air inlet 1a is arranged in the air inlet end, an air outlet 1b is arranged in the air outlet end, the air inlet 1a and the air outlet 1b are arranged on the same central line, an annular abutting part 1c which is arranged on the same central line as the air inlet 1a is arranged in the valve body 1, a support 2 which is positioned on the left side of the annular abutting part 1c is connected with the inner thread of the valve body 1, and a check assembly is connected with the support 2 in a sliding manner along the left-right direction. The non-return subassembly includes core 3 and spring 4, the core 3 has the body of rod 3a that passes support 2 and links firmly in the head 3b of body of rod 3a right-hand member portion, head 3b is located annular portion of leaning on 1 c's right side, spring 4 cover is established on body of rod 3a and spring 4 both ends respectively with support 2 and head 3b offset, head 3b has linked firmly sealed 6, body of rod 3a overcomes when spring 4 elasticity moves towards the left side and can lean on annular portion of leaning on 1c right flank to form the seal, body of rod 3a left end portion links firmly the check ring 5 that can lean on with support 2 when body of rod 3a moves rightwards. The right side face of the sealing gasket 6 is provided with a sealing flange 6a, the left side face of the sealing flange 6a is an outer convex arc face, and by the arrangement, the sealing gasket 6 can form a linear seal when being abutted against the annular abutting part 1c, so that the sealing effect is ensured.

As shown in fig. 1-4, the bracket 2 includes a connecting ring 2a, a guide post 2b located inside the connecting ring 2a and concentrically arranged with the connecting ring, and a plurality of struts 2c fixedly connected between the guide post 2b and the connecting ring 2a, the guide post 2b is provided with a through hole 2b1 for the rod body 3a to pass through along the left-right direction, the baffle ring 5 is located at the left side of the guide post 2b, and the left end of the spring 4 abuts against the right end of the guide post 2 b. The left end of the guide post 2b is hexagonal, so that a position can be provided for clamping a tool, and a worker can conveniently install or detach the bracket 2. In this embodiment, the core 3 is a plastic part, the left end of the rod body 3a has two elastic clamping flaps 3a1 arranged around the center line thereof and arranged opposite to each other, a yielding gap 3a2 is arranged between two adjacent elastic clamping flaps 3a1, the baffle ring 5 is sleeved outside each elastic clamping flap 3a1, the left end of each elastic clamping flap 3a1 has a shoulder 3a11 for preventing the baffle ring 5 from falling off, and the right end of the baffle ring 5 is in an outward expansion shape. During assembly, the two elastic clamping petals 3a1 are extruded relatively to enable the baffle ring 5 to be sleeved outside the two elastic clamping petals 3a1, then the two elastic clamping petals 3a1 are separated from each other under self elasticity and are supported on the inner wall of the baffle ring 5, meanwhile, the shoulder 3a11 at the left end part of the two elastic clamping petals 3a1 can be buckled on the left end face of the baffle ring 5 to limit the baffle ring 5 on the rod body 3a, and the baffle ring 5 is prevented from falling off from the rod body 3a in the use process.

The gas check valve is used on a gas stove and is mainly used for preventing fire from returning into a gas pipeline to cause explosion when a tempering phenomenon occurs. Under normal state, the rod body 3a is in the position of keeping the sealing gasket 6 away from the annular abutting part 1c under the action of the spring 4, and at the moment, the central hole of the annular abutting part 1c is in an open state, namely, the inside of the air inlet end and the inside of the air outlet end are in a communication state, so that the fuel gas can smoothly pass through, that is, the fuel gas check valve is in a normally open state, and the sealing gasket 6 is not pushed away by the self pressure when the fuel gas passes through, so that the stable supply of the fuel gas can be ensured. When the backfire phenomenon occurs, the pressure of the air outlet end is larger than that of the air inlet end, and at the moment, the core 3 moves leftwards against the elastic force of the spring 4, so that the sealing gasket 6 is abutted against the right side surface of the annular abutting part 1c, and the right end orifice of the central hole of the annular abutting part 1c is blocked, thereby preventing the backfire of the fuel gas. Through the arrangement, the gas check valve is normally open in a normal state and is closed only when the pressure of the gas outlet end is larger than that of the gas inlet end, so that the effect of preventing flame from returning into the gas pipeline is achieved, and meanwhile, the normal supply of gas cannot be influenced because the gas check valve is normally open.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the utility model. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the utility model or exceeding the scope of the utility model as defined in the accompanying claims.

Claims

1. The gas check valve comprises a valve body (1) with an air inlet end at the left end and an air outlet end at the right end, and is characterized in that an annular abutting part (1 c) is arranged in the valve body (1), a support (2) positioned at the left side of the annular abutting part (1 c) is connected with the valve body (1) in an internal thread mode, a check assembly is connected with the support (2) in a sliding mode along the left-right direction, the check assembly comprises a core (3) and a spring (4), the core (3) is provided with a rod body (3 a) penetrating through the support (2) and a head (3 b) fixedly connected to the right end of the rod body (3 a), the head (3 b) is positioned on the right side of the annular abutting part (1 c), the spring (4) is sleeved on the rod body (3 a) and two ends of the spring are abutted to the support (2) and the head (3 b) respectively, the head (3 b) is fixedly connected with a sealing gasket (6), the rod body (3 a) can abut against the right side of the annular abutting part (1 c) when the rod body (3 a) moves towards the left side against the elasticity of the left side, and the left end (3 a) can abut against the rod body (5) when the rod body (3 a) is fixedly connected with the support (2).

2. The gas check valve according to claim 1, wherein the bracket (2) comprises a connecting ring (2 a), a guide post (2 b) which is positioned at the inner side of the connecting ring (2 a) and is concentrically arranged with the connecting ring, and a plurality of struts (2 c) which are fixedly connected between the guide post (2 b) and the connecting ring (2 a), the guide post (2 b) is provided with a through hole (2 b 1) for the rod body (3 a) to pass through along the left-right direction, the baffle ring (5) is positioned at the left side of the guide post (2 b), and the left end of the spring (4) is abutted against the right end of the guide post (2 b).

3. The gas check valve according to claim 2, wherein the core (3) is a plastic part, the left end of the rod body (3 a) is provided with two elastic clamping flaps (3 a 1) which are arranged around the center line of the rod body and are oppositely arranged, a yielding gap (3 a 2) is arranged between two adjacent elastic clamping flaps (3 a 1), the baffle ring (5) is sleeved outside each elastic clamping flap (3 a 1), and the left end of each elastic clamping flap (3 a 1) is provided with a shoulder (3 a 11) for preventing the baffle ring (5) from falling off.

4. A gas non-return valve according to claim 3, wherein the right end of the retainer ring (5) is flared.

5. A gas non-return valve according to claim 2, wherein the left end of the guide post (2 b) is hexagonal.

6. The gas non-return valve according to claim 1 or 2 or 3 or 4 or 5, wherein the right side of the gasket (6) has a sealing flange (6 a), and the left side of the sealing flange (6 a) is an outwardly convex arc surface.