CN212719197U

CN212719197U - Pressure reducing valve with stable sealing device

Info

Publication number: CN212719197U
Application number: CN202020513960.9U
Authority: CN
Inventors: 翁国栋; 夏忠星; 石瑞君
Original assignee: Ningbo Sanan Valve Manufacture Co ltd
Current assignee: Ningbo Sanan Valve Manufacture Co ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2021-03-16
Anticipated expiration: 2030-04-09

Abstract

The utility model relates to a relief pressure valve with stabilize sealing device, including the valve body that has the cavity, be located piston in the cavity and the sealing device of setting at the piston lower extreme, valve body one side is equipped with the gas outlet passageway, sealing device with form the valve that can supply the gas circulation between the cavity inner wall, the shaping of piston lower extreme has the boss with the fixed sealing device upside, its characterized in that: the sealing device comprises a sealing ring sleeved at the lower end of the piston and a compression nut used for fixing the sealing ring, an upper concave first groove is formed on the boss, a lower concave second groove is formed on the compression nut, and a first convex ring and a second convex ring which are embedded in the first groove and the second groove are respectively formed on the upper surface and the lower surface of the sealing ring. The pressure reducing valve has good sealing performance and is safe and reliable.

Description

Pressure reducing valve with stable sealing device

Technical Field

The utility model relates to the technical field of valves, concretely relates to relief pressure valve with stabilize sealing device.

Background

The pressure reducing valve is a device which can input high-pressure gas (such as fire extinguishing agent) in a container and then reduce pressure and output, a sealing device is usually arranged at the end part of a piston in the pressure reducing valve, as shown in figure 1, a valve through which the gas can pass is formed between the sealing device and an inner cavity of a valve body, and the opening and the closing of the valve are realized by the up-and-down movement of the sealing device pushed by the piston, the sealing device in the prior art has a simpler structure and usually comprises a check ring sleeved at the end part of the piston, a sealing ring and a gland nut used for fixing the sealing ring, the pressure reducing valve has some defects, for example, when the valve is closed and opened, because the gas pressure of a gas inlet channel is larger than the gas pressure of a gas outlet channel, the sealing ring is easy to peel off and fall off under the gas pressure blowing at a gap between the contact surface, affecting the closing effect of the valve or leading to the peeling-off of the sealing ring.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sealing performance is good and safe and reliable's relief pressure valve that has stable sealing device.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a relief pressure valve with stabilize sealing device, includes the valve body that has the cavity, is located piston in the cavity and the sealing device who sets up at the piston lower extreme, valve body one side is equipped with the gas outlet passageway, sealing device with form the valve that can supply the gas circulation between the cavity inner wall, the shaping of piston lower extreme has the boss with the fixed sealing device upside, its characterized in that: the sealing device comprises a sealing ring sleeved at the lower end of the piston and a compression nut used for fixing the sealing ring, an upper concave first groove is formed on the boss, a lower concave second groove is formed on the compression nut, and a first convex ring and a second convex ring which are embedded in the first groove and the second groove are respectively formed on the upper surface and the lower surface of the sealing ring.

Furthermore, gaps are reserved between the upper surface of the sealing ring and the boss and between the lower surface of the sealing ring and the compression nut.

Furthermore, the compression nut is provided with a small hole for communicating the second groove with the cavity.

Further, the cross-sectional width of the second convex ring is larger than that of the first convex ring.

Furthermore, the small holes are distributed on the compression nut in a circumferential mode.

Further, the cavity endotheca of valve body lower extreme is equipped with the joint, connect have with the hollow structure of cavity intercommunication, the hollow structure who connects forms the air inlet passageway, it is fixed with the valve body through joint nut to connect, connect on the outer wall inlay be equipped with the cavity seals complex O type circle.

Compared with the prior art, the utility model has the advantages of it is following: the sealing ring of the pressure reducing valve is provided with the first convex ring and the second convex ring, so that the sealing ring cannot be peeled off and fall off at the opening and closing moment of the valve, and the sealing performance is good, safe and reliable; meanwhile, gaps are reserved at the contact positions of the upper surface and the lower surface of the sealing ring and the piston and the compression nut respectively, so that the pressure of high-pressure gas in the gaps is favorably dispersed, the stability of the sealing ring is ensured, and the processing and the assembly are convenient; the small hole is arranged on the compression nut, so that the force generated by high-pressure gas in the sealing ring can disappear or be balanced, and the sealing ring is more stable.

Drawings

FIG. 1 is a schematic diagram of a prior art relief valve;

FIG. 2 is a schematic view of the pressure reducing valve of the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 2.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

In the description of the present invention, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the terms of orientation and positional relationship indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of protection of the present invention.

Fig. 1 is a schematic structural diagram of a pressure reducing valve in the prior art, which includes an O-ring 101, a piston 102, a retainer ring 103, a seal ring 104, a gland nut 105, a valve body 106, an air outlet passage 107, a seal gasket 108, a joint 109, a joint nut 110, and an air inlet passage 111; the piston 102 is assembled in the valve body 106, an O-shaped sealing ring 101 is arranged on the piston 102, the piston 102 is in sealing contact with the valve body 06 and can move up and down in the cavity of the valve body 06, a retaining ring 103 is arranged at the lower end of the piston 102, a sealing ring 104 is arranged below the retaining ring 103, and the sealing ring 104 is tightly pressed on the piston 102 through a nut 105 thread; the valve is formed between the sealing ring 104 and the inner wall of the cavity of the valve body 106, the lower end of the valve body 106 is provided with a sealing gasket 108, a joint 109 is screwed on the valve body 106, and a joint nut 110 which can rotate freely is arranged on the joint 109. The working principle of the pressure reducing valve is as follows: the union nut 110 is connected to a head valve (not shown) of a container (e.g., a bottle of a fire extinguisher), and the outlet passage is connected to a delivery line. When high-pressure gas is input into the gas inlet channel 111, the high-pressure gas flows from the gas inlet channel 111 to the gas outlet channel 107 through the valve, and when the gas pressure in the gas outlet channel 107 reaches a certain value, the piston 102 is pushed to move upwards, and the valve is closed; when the gas flows out from the gas outlet channel 107 to reduce the gas pressure in the gas outlet channel 107, the piston 102 moves downwards to open the valve, so that the high-pressure gas in the container is discharged, and the circulation is performed in such a way, the pressure of the gas outlet channel 107 is ensured not to exceed the set value, and the fluctuation constant pressure is kept. However, this kind of pressure reducing valve has some disadvantages, such as when the valve is closed and opened, because the gas pressure in the gas inlet channel 111 is greater than the pressure in the gas outlet channel 107, the seal ring 104 is easy to peel off under the blowing of the gas pressure in the gap between the contact surfaces of the seal ring 104 and the gland nut 105, meanwhile, because there are processing and assembling errors among the retainer ring 103, the seal ring 104 and the gland nut 105, the valve closing effect is affected or the seal ring 104 is caused to peel off, generally speaking, the stability of the sealing device of the existing pressure reducing valve is poor, and the sealing performance is affected.

In view of this, the present application proposes a pressure reducing valve with a stable sealing device to overcome these drawbacks.

As shown in fig. 2 and 3, the pressure reducing valve of the present application is schematically constructed, and as shown in the drawings, the pressure reducing valve includes a valve body 205 having a cavity 211, a piston 202 located in the cavity 211, and a sealing device disposed at a lower end of the piston 202, an air outlet channel 206 is arranged at one side of the valve body 205, an O-shaped sealing ring 201 which is matched with the inner wall of the cavity 211 in a sealing way is embedded at the upper end of the piston 202, a valve for gas circulation is formed between the sealing device and the inner wall of the cavity 211, a boss 212 for fixing the upper side of the sealing device is formed at the lower end of the piston 202, the sealing device comprises a sealing ring 203 sleeved at the lower end of the piston 202 and a compression nut 204 used for fixing the sealing ring 203, the boss 212 is formed with an upwardly concave first groove 213, the compression nut 204 is formed with a downwardly concave second groove 214, the upper and lower surfaces of the sealing ring 203 are respectively formed with a first protruding ring 215 and a second protruding ring 216 which are embedded in the first groove 213 and the second groove 214.

In this embodiment, a gap is formed between the upper surface of the sealing ring 204 and the boss 212 and between the lower surface of the sealing ring 203 and the compression nut 204. This can disperse the gas pressure and ensure the stability of the seal ring 203.

In this embodiment, the compression nut 204 is provided with a small hole 217 for communicating the second groove 214 with the cavity 211. Preferably, the holes 217 are provided in a plurality and circumferentially distributed on the compression nut 204. This eliminates or balances the force generated by the high pressure gas in the seal ring 203, making the seal ring 203 more stable and reliable.

In this embodiment, the cross-sectional width of the second protruding ring 216 is larger than the cross-sectional width of the first protruding ring 215.

In this embodiment, a joint 208 is sleeved in a cavity 211 at the lower end of the valve body 205, the joint 208 has a hollow structure communicated with the cavity 211, the hollow structure of the joint 208 forms an air inlet channel 210, the joint 208 is fixed with the valve body 205 through a joint nut 209, and an O-ring 207 which is in close fit with the cavity 211 is embedded on the outer wall of the joint 208.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a relief pressure valve with stabilize sealing device, includes the valve body that has the cavity, is located piston in the cavity and the sealing device who sets up at the piston lower extreme, valve body one side is equipped with the gas outlet passageway, sealing device with form the valve that can supply the gas circulation between the cavity inner wall, the shaping of piston lower extreme has the boss with the fixed sealing device upside, its characterized in that: the sealing device comprises a sealing ring sleeved at the lower end of the piston and a compression nut used for fixing the sealing ring, an upper concave first groove is formed on the boss, a lower concave second groove is formed on the compression nut, and a first convex ring and a second convex ring which are embedded in the first groove and the second groove are respectively formed on the upper surface and the lower surface of the sealing ring.

2. The pressure reducing valve according to claim 1, wherein: gaps are arranged between the upper surface of the sealing ring and the boss and between the lower surface of the sealing ring and the compression nut.

3. The pressure reducing valve according to claim 2, wherein: and the compression nut is provided with a small hole for communicating the second groove with the cavity.

4. The pressure reducing valve according to claim 3, wherein: the cross-sectional width of the second convex ring is larger than that of the first convex ring.

5. The pressure reducing valve according to claim 3, wherein: the small holes are distributed on the compression nut in a circumferential mode.

6. The pressure reducing valve according to claim 1, wherein: the utility model discloses a valve body, including valve body, cavity, joint nut, cavity seal complex O type circle, the cavity endotheca of valve body lower extreme is equipped with the joint, connect have with the hollow structure of cavity intercommunication, the hollow structure who connects forms air inlet channel, it is fixed with the valve body that the joint passes through joint nut, inlay on the joint outer wall be equipped with the cavity seals complex O type circle.