Gas emergency cut-off electromagnetic valve

Abstract

The utility model belongs to the technical field of cut-off valves, and particularly relates to a gas emergency cut-off electromagnetic valve which comprises a shell and a valve body fixed to the bottom of the shell, a fixing frame and a limiting groove are arranged in the shell, the top of the inner side of the fixing frame is connected with a linkage shaft through a first spring, and an iron core is fixed to the middle of the linkage shaft. An electromagnetic coil matched with the iron core is arranged at the bottom of the fixed frame, a steering shaft is arranged in the limiting groove and matched with the linkage shaft, a second spring is connected to the inner wall of the limiting groove and connected with a string clamping shaft, a lock is arranged on the side, away from the second spring, of the string clamping shaft in a matched mode, a hanging ring is hung on the lock in a sleeving mode, and a steel wire rope is connected to the bottom of the hanging ring. A valve rod is fixed to the upper end of the valve element, the top of the valve rod penetrates through the top of the valve element and the bottom of the shell to be connected with the lower end of the steel wire rope, and a reset spring is arranged between the top of the valve element and the top wall of the valve element. Large-current operation does not need to be maintained for a long time, and potential safety hazards caused by automatic valve opening are avoided.

Description

Technical Field

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

[0002] The gas emergency cut-off solenoid valve is a safety emergency cut-off device for gas pipelines, which can be connected with gas leakage alarm systems, fire alarm systems and other intelligent alarm control terminal modules to realize near or far automatic emergency cut-off of the gas source, so as to prevent safety accidents caused by gas leakage and protect the safety of personnel and property. The gas emergency cut-off solenoid valve is widely used in the safety protection systems of inflammable and explosive medium pipe networks in cities or factories, and has high reliability requirements.

[0003] The gas emergency cut-off solenoid valves commonly used in industry include two types: normally open type and normally closed type. For the normally open type gas emergency cut-off solenoid valve, generally, the valve stem needs to be manually lifted to open the valve. When the electromagnetic coil is energized, the action pin is disengaged from the valve stem to cut off the valve. However, when there is a control power failure or the action pin is stuck, the valve cannot be cut off. When the electromagnetic coil of the normally closed type gas emergency cut-off solenoid valve is energized, the magnetic force of the coil overcomes the elastic force of the main spring in the valve body to open the valve. When the electromagnetic coil is de-energized, the valve is cut off by the elastic force of the main spring inside the valve body. However, when the normally closed type gas emergency cut-off solenoid valve is applied in large-diameter pipelines, in order to balance the elastic force of the main spring in the valve body, the electromagnetic coil needs to maintain a large current for a long time, which is easy to cause the coil to burn out and unable to perform emergency cut-off. Content of the Utility Model

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a gas emergency cut-off solenoid valve. The gas emergency cut-off solenoid valve can achieve emergency cut-off through the coordinated actions of a linkage shaft, a steering shaft, a chord shaft and a lock head, can reduce the current passing through the electromagnetic coil when the valve is in the normally open state, has a simple structure, is convenient to use, easy to overhaul and has high reliability.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0006] The gas emergency cut-off solenoid valve described in the utility model includes a housing and a valve body fixed to the bottom of the housing. A fixed frame and a limiting groove are arranged inside the housing. A linkage shaft is connected to the top inside the fixed frame through a first spring. An iron core is fixed in the middle of the linkage shaft. An electromagnetic coil is arranged at the bottom of the fixed frame in cooperation with the iron core. A steering shaft is arranged inside the limiting groove. A through hole is opened on the side wall of the limiting groove close to the linkage shaft in cooperation with the steering shaft. The steering shaft passes through the through hole and is arranged in cooperation with the linkage shaft. A second spring is connected to the inner wall of the limiting groove. The second spring is connected to a string clamping shaft. A lock head is arranged on the side of the string clamping shaft away from the second spring. A through hole is opened in the limiting groove in cooperation with the lock head. The lock head is arranged in the through hole. A hanging ring is sleeved on the lock head. A steel wire rope is connected to the bottom of the hanging ring. A valve core is arranged inside the valve body. A valve rod is fixed to the upper end of the valve core. The top of the valve rod penetrates through the top of the valve body and the bottom of the housing and is connected to the lower end of the steel wire rope. A return spring is arranged between the top of the valve core and the top wall of the valve body.

[0007] Among them:

[0008] The first spring is vertically arranged inside the fixed frame.

[0009] The electromagnetic coil is arranged directly below the iron core.

[0010] One end of the linkage shaft away from the steering shaft is rotatably connected to a fixed shaft, and the fixed shaft is fixed on the fixed frame.

[0011] Both ends of the electromagnetic coil are respectively connected with wiring electrodes, and the wiring electrodes penetrate through the fixed frame and the housing and extend to the outside of the housing.

[0012] The string clamping shaft is rotatably arranged in the limiting groove. The steering shaft is arranged above the string clamping shaft. The lock head is rotatably arranged on the housing.

[0013] The steering shaft is composed of a horizontal section and a vertical section. The horizontal section of the steering shaft is arranged in cooperation with the linkage shaft, and the vertical section of the steering shaft is arranged in cooperation with the string clamping shaft.

[0014] The second spring is arranged below the steering shaft. The second spring is horizontally arranged in the limiting groove.

[0015] The return spring is sleeved outside the valve rod. One end of the return spring is fixed on the top wall of the valve body, and the other end of the return spring is fixed on the top of the valve core.

[0016] A valve port is opened inside the valve body below the valve core.

[0017] The beneficial effects of the utility model:

[0018] Through the coordinated actions of the linkage shaft, steering shaft, string clamping shaft, and lock head, the present utility model can move the position of the valve core. The electromagnetic coil of this solenoid valve is in the control circuit and does not need to maintain a large current for a long time. When the valve needs to actively cut off or the power supply is cut off, through the coordinated actions of the electromagnetic coil and other components, emergency cut-off can be achieved, avoiding the coil burnout caused by the long-term operation of the electromagnetic coil under a large current. After power-on, manual reset is required to open the valve to avoid the safety hazards brought by the automatic opening of the valve. This device has a simple structure, is easy to use, easy to repair, and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] In the figure: 1, fixed frame; 2, limit groove; 3, housing; 4, hanging ring; 5, steel wire rope; 6, valve stem; 7, return spring; 8, valve core; 9, valve body; 10, valve port; 11, first spring; 12, fixed shaft; 13, iron core; 14, linkage shaft; 15, electromagnetic coil; 16, wiring electrode; 17, steering shaft; 18, string clamping shaft; 19, second spring; 20, lock head. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further describes the embodiments of the present utility model with reference to the drawings.

[0022] Embodiment 1

[0023] As Figure 1 shown, the gas emergency cut-off solenoid valve of the present utility model includes a housing 3 and a valve body 9 fixed to the bottom of the housing 3. A fixed frame 1 and a limit groove 2 are provided inside the housing 3. The top of the inner side of the fixed frame 1 is connected to a linkage shaft 14 through a first spring 11. An iron core 13 is fixed in the middle of the linkage shaft 14. An electromagnetic coil 15 is provided at the bottom of the fixed frame 1 to cooperate with the iron core 13. A steering shaft 17 is provided inside the limit groove 2. A through hole is opened on the side wall of the limit groove 2 close to the linkage shaft 14 to cooperate with the steering shaft 17. The steering shaft 17 passes through the through hole and is arranged in cooperation with the linkage shaft 14. A second spring 19 is connected to the inner wall of the limit groove 2. The second spring 19 is connected to a string clamping shaft 18. A lock head 20 is provided on the side of the string clamping shaft 18 away from the second spring 19. A through hole is opened in the limit groove 2 to cooperate with the lock head 20. The lock head 20 is arranged in the through hole. A hanging ring 4 is sleeved on the lock head 20. The bottom of the hanging ring 4 is connected to a steel wire rope 5. A valve core 8 is provided inside the valve body 9. The upper end of the valve core 8 is fixed with a valve stem 6. The top of the valve stem 6 penetrates through the top of the valve body 9 and the bottom of the housing 3 and is connected to the lower end of the steel wire rope 5. A return spring 7 is provided between the top of the valve core 8 and the top wall of the valve body 9.

[0024] The first spring 11 is vertically arranged inside the fixed frame 1. The linkage shaft 14 can move upward under the action of the first spring 11.

[0025] The electromagnetic coil 15 is arranged directly below the iron core 13. A coil current is applied to the electromagnetic coil 15 to generate magnetism, causing the iron core 13 to move downward.

[0026] One end of the linkage shaft 14 far from the steering shaft 17 is rotatably connected to a fixed shaft 12, and the fixed shaft 12 is fixed on the fixed frame 1. The linkage shaft 14 can move stably on the fixed frame 1 through the fixed shaft 12.

[0027] Both ends of the electromagnetic coil 15 are respectively connected to wiring electrodes 16, and the wiring electrodes 16 penetrate through the fixed frame 1 and the housing 3 and extend to the outside of the housing 3.

[0028] The string clamping shaft 18 is rotatably arranged in the limiting groove 2, the steering shaft 17 is arranged above the string clamping shaft 18, and the lock head 20 is rotatably arranged on the housing 3.

[0029] The steering shaft 17 consists of a horizontal section and a vertical section. The horizontal section of the steering shaft 17 is arranged in cooperation with the linkage shaft 14, and the vertical section of the steering shaft 17 is arranged in cooperation with the string clamping shaft 18.

[0030] The second spring 19 is arranged below the steering shaft 17, and the second spring 19 is arranged horizontally in the limiting groove 2. When the steering shaft 17 is stationary, the reset of the second spring 19 can make the string clamping shaft 18 move to the right.

[0031] The return spring 7 is sleeved outside the valve stem 6. One end of the return spring 7 is fixed on the top wall of the valve body 9, and the other end of the return spring 7 is fixed on the top of the valve core 8.

[0032] A valve port 10 is opened inside the valve body 9 below the valve core 8. Sealing rings are arranged at the bottom of the valve core 8 and the top of the valve port 10, and the two sealing rings are closely attached to prevent gas leakage.

[0033] Working principle and process:

[0034] During daily operation of the gas emergency cut-off solenoid valve of the present utility model, current is applied to the electromagnetic coil 15 through the wiring electrode 16, causing the electromagnetic coil 15 to generate magnetism, which can attract the iron core 13 to make the linkage shaft 14 move downward. The linkage shaft 14 is located below the steering shaft 17 and does not contact the steering shaft 17. The lock head 20 is hooked on the bottom of the string clamping shaft 18, and the hanging ring 4 pulls the valve stem 6 through the steel wire rope 5 to lift the valve core 8 upward, and the gas emergency cut-off solenoid valve is in the normally open state;

[0035] When an emergency occurs and it is necessary to cut off the solenoid valve, the current on the electromagnetic coil 15 is disconnected, the electromagnetic force on the iron core 13 disappears, the linkage shaft 14 moves upward under the action of the first spring 11, pushing the steering shaft 17 to rotate clockwise. At the same time, the vertical section of the steering shaft 17 pushes the string clamping shaft 18 to move leftward, causing the locking head 20 of the catch on the string clamping shaft 18 to disengage from the string clamping shaft 18 and rotate clockwise. At the same time, the return spring 7 resets, causing the hanging ring 4 to fall off the locking head 20, and the valve core 8 moves downward to land on the top of the valve port 10, and the gas emergency cut-off solenoid valve closes;

[0036] When the gas emergency cut-off solenoid valve is reset, the electromagnetic coil 15 is energized, and the iron core 13 drives the linkage shaft 14 to move downward under the action of the electromagnetic force. The linkage shaft 14 moves to the lower part of the steering shaft 17, and the string clamping shaft 18 moves rightward under the action of the second spring 19. At this time, the locking head 20 is re-hooked at the bottom of the string clamping shaft 18, and the hanging ring 4 is pulled up and hung on the locking head 20, causing the valve core 8 to be lifted upward to achieve the reset of the emergency cut-off solenoid valve.

Claims

1. A gas emergency cut-off solenoid valve, comprising a housing (3) and a valve body (9) fixed to the bottom of the housing (3), characterized in that, Inside the housing (3), there is a fixed frame (1) and a limiting groove (2). At the inner top of the fixed frame (1), a linkage shaft (14) is connected by a first spring (11). In the middle of the linkage shaft (14), an iron core (13) is fixed. At the bottom of the fixed frame (1), an electromagnetic coil (15) is arranged to cooperate with the iron core (13). Inside the limiting groove (2), a steering shaft (17) is arranged. On the side wall of the limiting groove (2) close to the linkage shaft (14), a through hole is opened to cooperate with the steering shaft (17). The steering shaft (17) passes through the through hole and is arranged to cooperate with the linkage shaft (14). On the inner wall of the limiting groove (2), a second spring (19) is connected. The second spring (19) is connected to a string clamping shaft (18). On the side of the string clamping shaft (18) away from the second spring (19), a lock head (20) is arranged in cooperation. The limiting groove (2) is provided with a through hole to cooperate with the lock head (20). The lock head (20) is arranged in the through hole. A hanging ring (4) is hung on the lock head (20). At the bottom of the hanging ring (4), a steel wire rope (5) is connected; inside the valve body (9), there is a valve core (8). At the upper end of the valve core (8), a valve stem (6) is fixed. The top of the valve stem (6) penetrates through the top of the valve body (9) and the bottom of the housing (3) and is connected to the lower end of the steel wire rope (5). Between the top of the valve core (8) and the top wall of the valve body (9), a return spring (7) is arranged.

2. The gas emergency cut-off solenoid valve according to claim 1, characterized in that, The first spring (11) is vertically arranged inside the fixed frame (1).

3. The gas emergency cut-off solenoid valve according to claim 1, characterized in that, The electromagnetic coil (15) is arranged directly below the iron core (13).

4. The gas emergency cut-off solenoid valve according to claim 1, characterized in that, One end of the linkage shaft (14) away from the steering shaft (17) is rotatably connected to a fixed shaft (12), and the fixed shaft (12) is fixed on the fixed frame (1).

5. The gas emergency cut-off solenoid valve according to claim 1, characterized in that, Both ends of the electromagnetic coil (15) are respectively connected to wiring electrodes (16), and the wiring electrodes (16) penetrate through the fixed frame (1) and the housing (3) and extend to the outside of the housing (3).

6. The gas emergency cut-off solenoid valve according to claim 1, characterized in that, The string clamping shaft (18) is rotatably arranged in the limiting groove (2). The steering shaft (17) is arranged above the string clamping shaft (18). The lock head (20) is rotatably arranged on the housing (3).

7. The gas emergency cut-off solenoid valve according to claim 1, wherein The steering shaft (17) consists of a horizontal section and a vertical section. The horizontal section of the steering shaft (17) is arranged to cooperate with the linkage shaft (14), and the vertical section of the steering shaft (17) is arranged to cooperate with the string clamping shaft (18).

8. The gas emergency cut-off solenoid valve according to claim 1, wherein The second spring (19) is arranged below the steering shaft (17), and the second spring (19) is horizontally arranged in the limiting groove (2).

9. The gas emergency cut-off solenoid valve according to claim 1, wherein The return spring (7) is sleeved outside the valve stem (6). One end of the return spring (7) is fixed on the top wall of the valve body (9), and the other end of the return spring (7) is fixed on the top of the valve core (8).

10. The gas emergency cut-off solenoid valve according to claim 1, characterized in that, Inside the valve body (9) below the valve core (8), a valve port (10) is opened.

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