Emergency cut-off valve

Abstract

The utility model provides an emergency cut-off valve, and belongs to the technical field of gas accessories. The emergency cut-off valve solves the problem that an existing emergency cut-off valve is not safe enough in use. The emergency cut-off valve comprises an electromagnetic valve and a valve body, a fixing sleeve is arranged in the valve body, the outer wall of the fixing sleeve is sealed on the inner wall of an air inlet and the inner wall of an air outlet, a sliding block axially penetrates through the fixing sleeve, the end, on the air inlet side, of the sliding block extends out of the fixing sleeve and is fixedly connected with a sealing gasket, a lifting block is inserted into the fixing sleeve, and the lifting block is fixedly connected with a valve rod of the electromagnetic valve. The lifting block is provided with an obliquely-arranged sliding rail, the sliding block is provided with a sliding rod located in the sliding rail, a spring is arranged in the valve body, and the spring provides elastic force so that the lifting block can keep the trend of driving the sliding block to move and enabling the sealing gasket to be sealed in the fixing sleeve. The sliding block moves and enables the sealing gasket to keep a trend away from the fixing sleeve. The utility model has the advantages of good adaptability, good use safety and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas fittings, and particularly relates to an emergency cut-off valve. Background Art

[0002] The emergency cut-off valve is connected to a gas pipeline. When a gas sensor detects that the indoor gas concentration exceeds the standard, the controller controls the emergency cut-off valve to operate, cutting off the gas pipeline and ensuring the safety of use.

[0003] For example, a Chinese patent document discloses a gas emergency cut-off solenoid valve [Application No.: 201120470025.X; Authorization Publication No.: CN202327316U], which includes a valve body and an actuator. The connection between the actuator and the valve body is sealed through an arc-shaped ring. The actuator is fixedly connected to the valve body. The actuator includes an electromagnetic control seat, an electromagnetic coil assembly, and an iron core switch assembly. The iron core switch assembly includes an upper pull rod, a moving iron core, and a lower pull rod longitudinally connected in sequence. The bottom end of the lower pull rod is connected to a rubber sealing assembly. A tower cap is sleeved on the lower pull rod, and the tower cap is fixedly connected to the electromagnetic control seat through a plastic pressing cap. The rubber sealing assembly is connected to the electromagnetic control seat through a spring.

[0004] The above gas emergency cut-off solenoid valve controls the opening and closing of the valve body through the iron core switch assembly, but it is not suitable for high-pressure gas use occasions because high-pressure gas will overcome the elastic force of the spring, causing the rubber sealing assembly to disengage from the sealing position, still resulting in leakage, and the safety of use is still not ideal. Summary of the Invention

[0005] The purpose of the utility model is to provide an emergency cut-off valve with good applicability and good safety of use for the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved by the following technical solutions: An emergency cut-off valve includes a solenoid valve and a valve body. The valve body has an air inlet and an air outlet. It is characterized in that a fixed sleeve is arranged in the valve body between the air inlet and the air outlet. The outer wall of the fixed sleeve is sealed to the inner walls of both the air inlet and the air outlet. A slider axially penetrates through the fixed sleeve. The end of the slider on the air inlet side extends out of the fixed sleeve and a sealing gasket is fixedly connected to this end. A lifting block is inserted into the fixed sleeve. The lifting block is fixedly connected to the valve rod of the solenoid valve. The lifting block has an inclined slide rail. The slider has a slide bar located in the slide rail. A spring is arranged in the valve body and the spring provides an elastic force to keep the lifting block driving the slider to displace and make the sealing gasket tend to seal the fixed sleeve. When the solenoid valve is not powered on, the valve rod causes the lifting block to overcome the elastic force of the spring, the slider displaces and makes the sealing gasket tend to keep away from the fixed sleeve.

[0007] In the above-mentioned emergency cut-off valve, the slider passes through the lifting block. Both sides of the lifting block are provided with slide rails. The upper ends of the two slide rails are closer to the air inlet side than their respective lower ends. Both sides of the slider are provided with slide bars located in the corresponding slide rails.

[0008] In the above-mentioned emergency cut-off valve, the spring allows the valve stem to pass through. The lower end of the spring abuts against the shoulder of the valve body, and the upper end of the spring abuts against the radially outwardly protruding collar of the valve stem.

[0009] In the above-mentioned emergency cut-off valve, the inner wall of the air outlet is provided with a radially inwardly protruding shoulder for the end of the fixed sleeve to abut against.

[0010] In the above-mentioned emergency cut-off valve, a first sealing ring sealed to the inner wall of the air inlet is embedded in the outer wall of the fixed sleeve, and a second sealing ring sealed to the inner wall of the air outlet is embedded in the outer wall of the fixed sleeve.

[0011] In the above-mentioned emergency cut-off valve, the end of the slider is embedded in the gasket. The end of the slider has a radially outwardly turned edge embedded in the gasket. The end of the fixed sleeve facing the gasket has a circumferentially axially protruding convex ring with a conical outer wall.

[0012] Compared with the prior art, the emergency cut-off valve of the present invention has good sealing performance, is applicable to low- and high-pressure gas pipelines, has good applicability, and good use safety. Description of the Drawings

[0013] Figure 1 is a three-dimensional structure diagram of the emergency cut-off valve of the present invention.

[0014] Figure 2 is a structural cross-sectional view of the emergency cut-off valve of the present invention.

[0015] Figure 3 is a partial structure diagram of the emergency cut-off valve of the present invention.

[0016] Figure 4 is a three-dimensional structure diagram of the slider and the lifting block in the emergency cut-off valve of the present invention.

[0017] In the figure, 1. electromagnetic valve; 2. valve body; 3. air inlet; 4. air outlet; 5. fixed sleeve; 6. slider; 7. gasket; 8. lifting block; 9. valve stem; 10. slide rail; 11. slide bar; 12. spring; 13. shoulder; 14. collar; 15. shoulder; 16. first sealing ring; 17. second sealing ring; 18. turned edge; 19. convex ring. Detailed Embodiments

[0018] The following are specific embodiments of the present invention and in combination with the drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0019] AsFigure 1 , Figure 2 , Figure 3 and Figure 4 As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 , this emergency cut-off valve includes a solenoid valve 1 and a valve body 2. The valve body 2 has an air inlet 3 and an air outlet 4. A fixed sleeve 5 is provided in the valve body 2 between the air inlet 3 and the air outlet 4. The outer wall of the fixed sleeve 5 is sealed to the inner walls of both the air inlet 3 and the air outlet 4. A slider 6 is axially penetrated through the fixed sleeve 5. The end of the slider 6 on the side of the air inlet 3 extends out of the fixed sleeve 5 and a sealing gasket 7 is fixedly connected to this end. A lifting block 8 is inserted into the fixed sleeve 5, and the lifting block 8 is fixedly connected to the valve stem 9 of the solenoid valve 1. In this embodiment, the lifting block 8 is threadedly connected to the valve stem 9 through an internal threaded hole. The lifting block 8 has an inclined slide rail 10, and the slider 6 has a slide bar 11 located in the slide rail 10. A spring 12 is provided in the valve body 2 and the spring 12 provides an elastic force to keep the lifting block 8 driving the slider 6 to displace and make the sealing gasket 7 tend to seal the fixed sleeve 5. When the solenoid valve 1 is not powered on, the valve stem 9 makes the lifting block 8 overcome the elastic force of the spring 12, the slider 6 displaces and makes the sealing gasket 7 tend to keep away from the fixed sleeve 5.

[0020] This emergency cut-off valve sets the sealing gasket 7 at the inner end of the air inlet 3. When high-pressure gas impacts the sealing gasket 7, it will only make the sealing gasket 7 seal the fixed sleeve 5 more tightly, with good sealing performance and no leakage problem at the sealing gasket 7. This emergency cut-off valve has good applicability and good use safety.

[0021] When this emergency cut-off valve is in use, the solenoid valve 1 is not powered on. The valve stem 9 makes the lifting block 8 overcome the elastic force of the spring 12, the slider 6 displaces and makes the sealing gasket 7 tend to keep away from the fixed sleeve 5. Gas enters the fixed sleeve 5 from the gap between the sealing gasket 7 and the fixed sleeve 5 and then flows out from the air outlet 4 for gas supply; when gas leakage occurs, the solenoid valve 1 is powered on to make the valve stem 9 displace. The elastic force of the spring 12 makes the lifting block 8 drive the slider 6 to displace, and the sealing gasket 7 at the end of the slider 6 quickly seals the fixed sleeve 5 to achieve the purpose of cutting off the gas.

[0022] To elaborate further, the slider 6 passes through the lifting block 8. Both sides of the lifting block 8 have slide rails 10. The upper ends of the two slide rails 10 are closer to the air inlet 3 side than their respective lower ends. Both sides of the slider 6 have slide bars 11 located in the corresponding slide rails 10. In this way, the structure is stable, the lifting block 8 drives the slider 6 to displace smoothly. When the two slide bars 11 are located at the upper ends of the corresponding slide rails 10, the sealing gasket 7 is away from the fixed sleeve 5. When the two slide bars 11 are located at the lower ends of the corresponding slide rails 10, the sealing gasket 7 seals the fixed sleeve 5.

[0023] The spring 12 is provided for the valve stem 9 to pass through. The lower end of the spring 12 abuts against the shoulder 13 of the valve body 2, and the upper end of the spring 12 abuts against the radially outwardly protruding collar 14 of the valve stem 9. Such installation is convenient. The spring 12 provides elastic force to keep the valve stem 9 in a tendency to drive the lifting block 8 to displace upward, so that the slide rod 11 is located at the lower end of the slide rail 10, and the gasket 7 is sealed to the fixed sleeve 5.

[0024] The inner wall of the air outlet 4 has a radially inwardly protruding shoulder 15 for the end of the fixed sleeve 5 to abut against. During assembly, the fixed sleeve 5 is inserted into the air inlet 3 until the end of the fixed sleeve 5 abuts against the shoulder 15. The assembly is convenient, and the shoulder 15 provides support for the fixed sleeve 5. The fixed sleeve 5 will not axially move even when subjected to the impact of high-pressure gas, and the working stability is good.

[0025] A first sealing ring 16 that seals the inner wall of the air inlet 3 is embedded on the outer wall of the fixed sleeve 5, and a second sealing ring 17 that seals the inner wall of the air outlet 4 is embedded on the outer wall of the fixed sleeve 5. This ensures the sealing performance between the fixed sleeve 5, the air inlet 3 and the air outlet 4, and avoids gas leakage.

[0026] The gasket 7 is provided for the end of the slider 6 to be embedded. The end of the slider 6 has a radially outwardly turned-up edge 18 that is embedded in the gasket 7. The end of the fixed sleeve 5 facing the gasket 7 has a circumferentially axially protruding convex ring 19 with a conical outer wall. In this way, the gasket 7 and the slider 6 are firmly connected, and the convex ring 19 reduces the interference area and has good sealing performance with the gasket 7.

[0027] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art. The specific embodiments described herein are only illustrative examples of the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An emergency shut-off valve, comprising a solenoid valve (1) and a valve body (2), wherein the valve body (2) has an air inlet (3) and an air outlet (4), and is characterized in that: The valve body (2) is provided with a fixed sleeve (5) located between the air inlet (3) and the air outlet (4); the outer wall of the fixed sleeve (5) is sealed to the inner walls of the air inlet (3) and the air outlet (4); a slider (6) is axially passed through the fixed sleeve (5); the end of the slider (6) on the air inlet (3) side extends out of the fixed sleeve (5) and the end is fixedly connected to a sealing gasket (7); the fixed sleeve (5) is plugged with a lifting block (8); the lifting block (8) is fixedly connected to the valve stem (9) of the solenoid valve (1); the lifting block (8) 8) has an inclined slide rail (10), the slider (6) has a slide rod (11) located in the slide rail (10), a spring (12) is provided in the valve body (2), and the spring (12) provides elastic force so that the lifting block (8) keeps driving the slider (6) to move and makes the sealing gasket (7) seal against the fixed sleeve (5), when the solenoid valve (1) is not energized, the valve stem (9) makes the lifting block (8) overcome the elastic force of the spring (12), the slider (6) moves and makes the sealing gasket (7) keep away from the fixed sleeve (5).

2. The emergency shut-off valve according to claim 1, characterized in that: The slider (6) passes through the lifting block (8), and both sides of the lifting block (8) have slide rails (10), and the upper ends of the two slide rails (10) are closer to the air inlet (3) than their respective lower ends, and both sides of the slider (6) have slide rods (11) located in the corresponding slide rails (10).

3. The emergency shut-off valve according to claim 2, characterized in that: The spring (12) is passed through by the valve stem (9), the lower end of the spring (12) abuts against a stop shoulder (13) of the valve body (2), and the upper end of the spring (12) abuts against a radially outwardly protruding collar (14) of the valve stem (9).

4. The emergency shut-off valve according to claim 3, characterized in that: The inner wall of the air outlet (4) has a radially inwardly protruding shoulder (15) for the end of the fixing sleeve (5) to abut against.

5. The emergency shut-off valve according to claim 4, characterized in that: The outer wall of the fixing sleeve (5) is embedded with a sealing ring 1 (16) which is sealed to the inner wall of the air inlet (3), and the outer wall of the fixing sleeve (5) is embedded with a sealing ring 2 (17) which is sealed to the inner wall of the air outlet (4).

6. The emergency shut-off valve according to claim 5, characterized in that: The sealing gasket (7) is embedded in the end of the slider (6), and the end of the slider (6) has a flange (18) that is radially turned outward and embedded in the sealing gasket (7). The end of the fixing sleeve (5) facing the sealing gasket (7) has a convex ring (19) that is axially protruding outward and has a conical outer wall.

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