Nitrogen safety valve

Abstract

The nitrogen safety valve comprises a valve body and a plug arranged at the rear end of the valve body, a cavity is formed in the valve body, a valve element is connected into the cavity in a sliding mode, an internal thread is arranged at a cavity opening in the rear end of the surface of the cavity, a connector is fixedly connected to the front end of the plug, an external thread is arranged on the surface of the outer wall of the connector, and the valve element is arranged in the cavity. And the internal thread is in meshed connection with the external thread, so that the valve body is connected with the plug. By combining the structural design of the safety valve, the valve body and the plug can be detached, so that the maintenance work of the spring in the later use process is facilitated, and the service life of the safety valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen safety valve technical field, concretely is a kind of nitrogen safety valve. BACKGROUND

[0002] Safety valve is the closing piece under the action of external force and is in normally closed state, when the medium pressure in equipment or pipeline rises more than specified value, it prevents the medium pressure in pipeline or equipment from exceeding specified value by discharging medium to system outside. Safety valve belongs to automatic valve, mainly used in boiler, pressure vessel and pipeline, control pressure does not exceed specified value, and it plays an important protective role for personal safety and equipment operation. Note that safety valve must be used after pressure test.

[0003] The existing safety valve resets by spring, but the elasticity of spring decreases under long-time high-intensity use, resulting in reduced reset ability. In order to increase the sealing effect of the existing safety valve, it is very inconvenient to replace and maintain, which affects the service life of the safety valve. SUMMARY

[0004] The utility model discloses a nitrogen safety valve to solve the above-mentioned background art mentioned that the existing safety valve resets by spring, but the elasticity of spring decreases under long-time high-intensity use, resulting in reduced reset ability. In order to increase the sealing effect of the existing safety valve, it is very inconvenient to replace and maintain, which affects the service life of the safety valve.

[0005] To achieve the above object, the utility model provides the following technical scheme: a nitrogen safety valve, including valve body and plug arranged at the rear end of valve body, the cavity is set up in the valve body, the valve core is slidably connected in the cavity, the inner thread is set up at the rear cavity opening of the cavity surface, the connecting head is fixedly connected to the front end of plug, the outer thread is set up on the outer wall surface of connecting head, and the inner thread and outer thread are engaged to connect the valve body and plug.

[0006] Preferably, the first recess is formed in the inner wall of the cavity at the front end of the inner thread, and the first sealing ring is installed in the first recess.

[0007] Preferably, the second recess is formed on the outer wall surface of the connecting head at the front end of the outer thread, and the sealing device is installed in the second recess.

[0008] Preferably, the sealing device comprises a second sealing ring and a stop ring, the second sealing ring is fixedly connected to the front end of the stop ring, and the second sealing ring and the stop ring are designed in an integral structure.

[0009] Preferably, the plug rear end middle part is provided with an adjusting opening, the adjusting opening is provided with a terminal screw rod, the connecting head surface middle part is provided with a movable slot, the movable slot middle part is provided with an adjusting hole, and the adjusting hole is communicated with the adjusting opening.

[0010] Preferably, the movable slot is movably connected with a jacking rod, the jacking rod surface front end is sleeved with a spring, and the spring far end is connected with the valve core tail end.

[0011] Preferably, the jacking rod outer wall is fixedly connected with a third sealing ring, and the third sealing ring is matched with the movable slot inner wall.

[0012] Preferably, the terminal screw rod is screwed with the adjusting hole, and the terminal screw rod front end is rotatably connected with the jacking rod.

[0013] Beneficial effects

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The structure design of the utility model is combined, the valve body and the plug can be disassembled, thereby facilitating the maintenance work of the spring in the later use process, and the service life of the safety valve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the whole internal section structure schematic diagram of the utility model;

[0017] Fig. 2 It is the A place enlarged structure schematic diagram of the utility model.

[0018] The corresponding relationship between the annotations of each figure and the component names in the figure is as follows:

[0019] 1. valve body;2. chamber;3. valve core;4. plug;5. internal thread;6. connecting head;7. first recess;

[0020] 8. first sealing ring;9. second recess;10. sealing device;11. adjusting opening;12. terminal screw rod;

[0021] 13. movable slot;14. adjusting hole;15. jacking rod;16. spring;17. external thread;18. third sealing ring;101. check ring;102. second sealing ring. PREFERRED EMBODIMENT

[0022] The technical solutions of the present application will be clearly and completely described below with reference to the embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0023] In the description of the present application, it should be pointed out that the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "vertical", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0024] As Figs. 1-2 It is a structure diagram of a nitrogen safety valve according to a preferred embodiment of the present application, in the embodiment, a nitrogen safety valve, comprising a valve body 1, and a plug 4 arranged at the rear end of the valve body 1, a cavity 2 is formed in the valve body 1, a valve core 3 is slidably connected in the cavity 2, an inner thread 5 is formed at the rear end of the cavity 2, a connecting head 6 is fixedly connected to the front end of the plug 4, an outer thread 17 is formed on the outer wall surface of the connecting head 6, and the inner thread 5 and the outer thread 17 are engaged to connect the valve body 1 and the plug 4; according to the structure design of the present application, the valve body 1 and the plug 4 can be disassembled and assembled through threaded connection, so as to facilitate the maintenance of the spring 16 in the later use process, and the service life of the safety valve is improved.

[0025] In the embodiment, a first groove 7 is formed at the front end of the inner thread 5 on the inner wall of the cavity 2, a first sealing ring 8 is installed in the first groove 7, a second groove 9 is formed at the front end of the outer thread 17 on the outer wall surface of the connecting head 6, and a sealing device 10 is installed in the second groove 9, and the sealing device 10 comprises a second sealing ring 102 and a stop ring 101, the second sealing ring 102 is fixedly connected to the front end of the stop ring 101, through the above structure design, the sealing property between the plug 4 and the cavity 2 is improved, and the second sealing ring 102 and the stop ring 101 are designed in an integrated structure, which improves the connection strength between the second sealing ring 102 and the stop ring 101.

[0026] In the embodiment, the end screw 12 is arranged in the adjusting hole 11, the movable slot 13 is arranged in the surface of the connecting head 6, the adjusting hole 14 is arranged in the middle of the movable slot 13, the adjusting hole 14 is communicated with the adjusting hole 11, the top rod 15 is movably arranged in the movable slot 13, the spring 16 is sleeved with the front end of the surface of the top rod 15, the end of the spring 16, which is far away from the top rod 15, is connected with the tail end of the valve core 3, the structure design can realize the parallel movement of the top rod 15 in the movable slot 13 by rotating the end screw 12.

[0027] In the embodiment, the third sealing ring 18 is fixedly connected with the outer wall of the top rod 15, and the third sealing ring 18 is attached to the inner wall of the movable slot 13, thereby increasing the sealing property between the top rod 15 and the chamber 2.

[0028] In the embodiment, the end screw 12 is screwed with the adjusting hole 14, the front end of the end screw 12 is rotatably connected with the bearing in the top rod 15, which is the prior art and will not be described here, the structure design can adjust the compression amount of the spring 16 and increase the use function of the safety valve.

[0029] The above is further detailed description of the utility model in combination with the specific implementation, which cannot be considered as the specific implementation of the utility model is limited to these descriptions, for the ordinary skilled in the art to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, which should be considered as belonging to the protection scope determined by the claims of the utility model.

Claims

1. A nitrogen safety valve comprising a valve body (1) and a plug (4) arranged at the rear end of the valve body (1), characterized in that: The valve body (1) is provided with a chamber (2), the chamber (2) is slidably connected with a valve core (3), the chamber (2) is provided with an internal thread (5) at the rear end of the chamber opening, the plug (4) is fixedly connected with a connecting head (6) at the front end, the connecting head (6) is provided with an external thread (17) on the outer wall surface, and the internal thread (5) and the external thread (17) are engaged to connect the valve body (1) and the plug (4).

2. The nitrogen safety valve of claim 1, wherein: The first recess (7) is formed on the inner wall of the chamber (2) at the front end of the internal thread (5), and the first recess (7) is provided with a first sealing ring (8).

3. The nitrogen safety valve of claim 1, wherein: The second recess (9) is formed on the outer wall surface of the connecting head (6) at the front end of the external thread (17), and the second recess (9) is provided with a sealing device (10).

4. A nitrogen safety valve according to claim 3, characterized in that: The sealing device (10) comprises a second sealing ring (102) and a retaining ring (101), the second sealing ring (102) is fixedly connected to the front end of the retaining ring (101), and the second sealing ring (102) and the retaining ring (101) are designed as an integral structure.

5. The nitrogen safety valve of claim 1, wherein: The plug (4) is provided with an adjusting port (11) at the rear end, the adjusting port (11) is provided with a terminal screw (12), the connecting head (6) is provided with a movable slot (13) at the middle of the surface, the movable slot (13) is provided with an adjusting hole (14) at the middle, and the adjusting hole (14) is communicated with the adjusting port (11).

6. A nitrogen safety valve according to claim 5, wherein: The movable slot (13) is movably connected with a jacking rod (15), the jacking rod (15) is provided with a spring (16) at the front end of the surface, and the end of the spring (16) away from the jacking rod (15) is connected with the tail end of the valve core (3).

7. A nitrogen safety valve according to claim 6, characterised in that: The jacking rod (15) is fixedly connected with a third sealing ring (18), and the third sealing ring (18) is attached to the inner wall of the movable slot (13).

8. The nitrogen safety valve of claim 5, wherein: The terminal screw (12) is screwed with the adjusting hole (14), and the front end of the terminal screw (12) is connected with the jacking rod (15).

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