Self-operated nitrogen-sealed valve for storage tank

Abstract

The utility model discloses a self-operated nitrogen-sealed valve for a storage tank, which belongs to the technical field of nitrogen-sealed valves and comprises a valve body, an actuator mounted above the valve body and a spring casing mounted above the actuator, the technical principle of the nitrogen-sealed valve is the prior art, two maintenance grooves are symmetrically arranged on the spring casing, and the maintenance grooves are communicated with the valve body. Wherein openings of the two maintenance grooves are large-area openings, maintenance cover plates with C-shaped cross sections are installed in the two maintenance grooves in a sealed mode, telescopic grooves are formed in the two opposite side walls of each maintenance cover plate, and air bags are fixedly bonded to the inner walls of the sides, back on to the spring shell, of the two telescopic grooves. Air injection pipes are fixedly welded to the two opposite side walls of the maintenance cover plate, and the two air injection pipes are communicated with the two air bags on the maintenance cover plate respectively. According to the self-operated nitrogen-sealed valve for the storage tank, a spring and other structures in the spring shell can be conveniently maintained, and maintenance work in the follow-up service cycle is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrogen sealing valves, and particularly relates to a self-operated nitrogen sealing valve for a storage tank. Background Art

[0002] The nitrogen sealing valve is used on the top of the storage tank to maintain a slight positive pressure inside the tank, isolate the material from the outside world, reduce the volatilization and waste of the material, and thus achieve the purpose of protecting the safety of the tank.

[0003] In the process of realizing the utility model, the inventors found that there are at least the following problems in the technology: However, the current nitrogen sealing valves, such as the patent disclosed with application number CN202121782596.7 - a self-powered nitrogen sealing valve used for storage tanks, have spring housings that are all one-piece and cannot be disassembled, which makes it difficult to maintain when the spring and other structures inside the spring housing are damaged.

[0004] To this end, we proposed a self-operated nitrogen sealing valve for storage tanks to solve the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a self-operated nitrogen sealing valve for a storage tank, which is convenient for maintenance of the spring and other structures inside the spring housing, facilitates maintenance work during the subsequent use cycle, and can effectively solve the problems in the background technology.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A self-operated nitrogen sealing valve for a storage tank, comprising a valve body, an actuator installed above the valve body, and a spring housing installed above the actuator, wherein the technical principle of the nitrogen sealing valve is the prior art, two maintenance grooves are symmetrically provided on the spring housing, wherein the openings of the two maintenance grooves are large-area openings, maintenance covers with a C-shaped cross section are sealed and installed in the two maintenance grooves, expansion grooves are formed on the opposite side walls of each maintenance cover, wherein the inner walls of the two expansion grooves on the side facing away from the spring housing are fixedly bonded with air bags;

[0008] Air injection pipes are fixedly welded on the two opposite side walls of the maintenance cover, and two of the air injection pipes are respectively connected to the two air bags on the maintenance cover. The interior of the air bag is filled with inert gas, and the pressure inside the air bag is slightly greater than a standard atmospheric pressure, so that the air bag has a tendency to expand to the outside. Sealing pads that fit the spring shell are fixedly bonded to the outer walls of the two air bags on the maintenance cover. There are four sealing pads in total, so that the sealing pads are squeezed by the self-expansion tendency of the inert gas in the air bag to achieve a better sealing effect.

[0009] As a preferred embodiment, fixed gaskets are symmetrically bonded to the inner wall of the spring housing at each maintenance groove, wherein four fixed gaskets are provided and respectively fit with four sealing gaskets; so that the four fixed gaskets cooperate with the four sealing gaskets to achieve a better sealing effect. In actual design, a structure similar to the fixed gasket can also be installed on the top and bottom walls of the maintenance cover to achieve a better sealing effect.

[0010] As a preferred embodiment, there are four gas injection pipes in total, and the inner wall of the opening of the gas injection pipe is provided with a thread, and a sealing cap is screwed on the gas injection pipe; thus, the gas injection pipe is sealed by the sealing cap.

[0011] As a preferred embodiment, positioning cylinders are fixedly welded on the upper and lower sides of the outer wall of the spring housing of each maintenance cover, a storage groove is formed on the side of the positioning cylinder facing the maintenance cover, and an electric telescopic rod and an arc plate connected to each other are provided in the storage groove; so that the electric telescopic rod can drive the arc plate to extend and retract.

[0012] As a preferred embodiment, the electric telescopic rod is vertically arranged, and both ends of the electric telescopic rod are respectively connected to the inner wall of the storage groove and the arc plate; so that the structure of the electric telescopic rod is stable and can operate normally.

[0013] As a preferred embodiment, one side wall of the arc plate is arc-shaped and fits with the outer wall of the spring housing or the maintenance cover; thereby making it easy to make the arc plate contact with the maintenance cover and position the maintenance cover.

[0014] In summary, the technical effects and advantages of the utility model are as follows:

[0015] The self-operated nitrogen sealing valve for the storage tank is filled with a sufficient amount of inert gas into the air bag connected to it through the two air injection pipes on the maintenance cover, so that the two cylinders squeeze the sealing gasket to maintain good sealing performance inside the spring housing. At the same time, the two maintenance covers can be easily removed, thereby facilitating the maintenance of the spring and other structures inside the spring housing, and facilitating maintenance work during the subsequent use cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a horizontal cross-sectional view of the spring housing of the utility model;

[0018] Figure 3 For this utility model Figure 2 A magnified view of the structure at center;

[0019] Figure 4 It is a vertical cross-sectional view of the spring housing of the utility model.

[0020] In the figure: 1. valve body; 2. actuator; 3. spring housing; 4. maintenance cover; 5. fixing gasket; 6. air injection pipe; 7. sealing cap; 8. air bag; 9. sealing gasket; 10. positioning cylinder; 11. storage slot; 12. electric telescopic rod; 13. arc plate; 14. telescopic slot. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Reference Figure 1-Figure 4 A self-operated nitrogen sealing valve for a storage tank comprises a valve body 1, an actuator 2 installed on the valve body 1 and a spring housing 3 installed on the actuator 2, wherein the technical principle of the nitrogen sealing valve is the prior art, two maintenance grooves are symmetrically provided on the spring housing 3, wherein the openings of the two maintenance grooves are large-area openings, and maintenance covers 4 with a C-shaped cross section are sealed and installed in the two maintenance grooves, and telescopic grooves 14 are formed on the opposite side walls of each maintenance cover 4, wherein the inner walls of the two telescopic grooves 14 facing away from the spring housing 3 are fixedly bonded with air bags 8, and the inner walls of the spring housing 3 at each maintenance groove are symmetrically bonded with fixed gaskets 5, wherein a total of four fixed gaskets 5 are provided and are respectively fitted with four sealing gaskets 9, so that the four fixed gaskets 5 cooperate with the four sealing gaskets 9 to achieve a better sealing effect, and in actual design, a structure similar to the fixed gasket 5 can also be installed on the top wall and the bottom wall of the maintenance cover 4 to achieve a better sealing effect;

[0023] Air injection pipes 6 are fixedly welded on the two opposite side walls of the maintenance cover 4. There are four air injection pipes 6 in total. The inner wall of the opening of the air injection pipe 6 is provided with a thread. A sealing cap 7 is screwed on the air injection pipe 6, so that the air injection pipe 6 is closed by the sealing cap 7. The two air injection pipes 6 are respectively connected to the two air bags 8 on the maintenance cover 4. The inside of the air bag 8 is filled with inert gas, and the pressure in the air bag 8 is slightly greater than a standard atmospheric pressure, so that the air bag 8 has a tendency to expand to the outside. The outer walls of the two air bags 8 on the maintenance cover 4 are fixedly bonded with sealing pads 9 that fit the spring housing 3. There are four sealing pads 9 in total, so that the sealing pads 9 are squeezed by the self-expansion tendency of the inert gas in the air bag 8 to achieve a better sealing effect.

[0024] A positioning cylinder 10 is fixedly welded on the upper and lower sides of the outer wall of the spring housing 3 of each maintenance cover 4, and a storage groove 11 is formed on the side of the positioning cylinder 10 facing the maintenance cover 4, and an electric telescopic rod 12 and an arc plate 13 connected to each other are arranged in the storage groove 11; so that the electric telescopic rod 12 can drive the arc plate 13 to extend and retract, the electric telescopic rod 12 is vertically arranged, and the two ends of the electric telescopic rod 12 are respectively connected to the inner wall of the storage groove 11 and the arc plate 13, so that the structure of the electric telescopic rod 12 is stable and can operate normally, and one side wall of the arc plate 13 is arc-shaped and fits with the outer wall of the spring housing 3 or the maintenance cover 4, so as to facilitate the contact between the arc plate 13 and the maintenance cover 4 and position the maintenance cover 4.

[0025] The self-operated nitrogen sealing valve for storage tanks: During the service life of the nitrogen sealing valve, if the structure such as the spring inside the spring housing 3 is damaged, or regular maintenance is required, the four electric telescopic rods 12 can be driven to retract, so that the four arc-shaped plates 13 are respectively retracted into the four storage grooves 11, and then the two maintenance covers 4 can be removed to fully expose the internal space of the spring housing 3, thereby facilitating the repair, replacement or maintenance of the spring and other structures inside the spring housing 3.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-operated nitrogen sealing valve for a storage tank, comprising a valve body (1), an actuator (2) installed above the valve body (1), and a spring housing (3) installed above the actuator (2), characterized in that: The spring housing (3) is symmetrically provided with two maintenance grooves, and a maintenance cover plate (4) with a C-shaped cross section is sealed and installed in the two maintenance grooves. The opposite side walls of each maintenance cover plate (4) are formed with telescopic grooves (14), and the inner walls of the two telescopic grooves (14) facing away from the spring housing (3) are fixedly bonded with air bags (8); The two opposite side walls of the maintenance cover (4) are fixedly welded with air injection pipes (6), wherein the two air injection pipes (6) are respectively connected to the two air bags (8) on the maintenance cover (4), the interior of the air bags (8) is filled with inert gas, and the outer walls of the two air bags (8) on the maintenance cover (4) are fixedly bonded with sealing pads (9) that are in contact with the spring housing (3), and a total of four sealing pads (9) are provided.

2. A self-operated nitrogen sealing valve for a storage tank according to claim 1, characterized in that: The inner wall of the spring housing (3) at the location of each maintenance slot is symmetrically bonded with a fixing gasket (5), wherein a total of four fixing gaskets (5) are provided and are respectively fitted with four sealing gaskets (9).

3. A self-operated nitrogen sealing valve for a storage tank according to claim 1, characterized in that: There are four gas injection pipes (6) in total, and the inner wall of the opening of the gas injection pipe (6) is provided with a thread, and a sealing cap (7) is screwed onto the thread on the gas injection pipe (6).

4. A self-operated nitrogen sealing valve for a storage tank according to claim 1, characterized in that: The outer wall of the spring housing (3) is fixedly welded with a positioning cylinder (10) on both upper and lower sides of each maintenance cover (4); a storage groove (11) is formed on the side of the positioning cylinder (10) facing the maintenance cover (4), and an electric telescopic rod (12) and an arc plate (13) connected to each other are arranged in the storage groove (11).

5. A self-operated nitrogen sealing valve for a storage tank according to claim 4, characterized in that: The electric telescopic rod (12) is arranged vertically, and two ends of the electric telescopic rod (12) are respectively connected to the inner wall of the storage groove (11) and the arc plate (13).

6. A self-operated nitrogen sealing valve for a storage tank according to claim 5, characterized in that: One side wall of the arc-shaped plate (13) is arc-shaped and fits with the outer wall of the spring housing (3) or the maintenance cover (4).

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