CN-224201194-U - Pressure relief device for ultralow-temperature pressure container

Abstract

The utility model discloses a pressure relief device of an ultralow temperature pressure container, which relates to the technical field of pressure relief devices and comprises a transition shell, wherein one end of the transition shell is connected with a sealing device, the other end of the transition shell is connected with a working medium inlet which is communicated with a working medium source, the transition shell, the working medium inlet and the sealing device form a cavity, the transition shell is provided with a working medium outlet, the sealing device comprises a sealing ball, a sealing base and a guide rod, the guide rod is connected with a compression spring, and the compression spring is compressed or stretched to limit the reciprocating movement of the sealing ball between a first position and a second position. The main body of the sealing ball is made of high-quality stainless steel 316L material, the sealing ball is made of ZrO 2 material, and the ZrO 2 material is used for replacing the rubber sealing ring, so that the working temperature range of the device is greatly improved, the corrosion resistance of the device is improved by combining and sealing the ZrO 2 and 316L materials, and the service life of the sealing ball is prolonged by times compared with that of the rubber sealing ring.

Inventors

• LI HETIAN

Assignees

• 无锡步拓科技有限公司

Dates

Publication Date

20260505

Application Date

20250620

Claims (10)

1. 1. The pressure relief device for the ultralow temperature pressure container is characterized by comprising a transition shell (1), wherein one end of the transition shell (1) is connected with a sealing device, the other end of the transition shell (1) is connected with a working medium inlet which is communicated with a working medium source, the transition shell (1), the working medium inlet and the sealing device form a cavity, the transition shell (1) is provided with a working medium outlet (15), the sealing device comprises a sealing ball (3), one end of the sealing ball (3) is abutted against a sealing base (13), the other end of the sealing ball (3) is abutted against a guide rod (5), the other end of the guide rod (5) is connected with a compression spring (8), and the compression spring (8) compresses or stretches to limit the sealing ball (3) to move back and forth between a first position and a second position; When the sealing ball (3) is positioned at the first position, the sealing ball (3) is abutted with the sealing base (13) to form a sealing structure, working medium in the cavity is limited to leak, and at the moment, the pressure provided by the compression spring (8) for the sealing ball (3) is larger than the pressure of the working medium acting on the sealing ball (3); When the sealing ball (3) is positioned at the second position, the sealing ball (3) is separated from the sealing base (13) to form a pressure relief gap, working medium in the cavity leaks out through the gap between the sealing ball (3) and the sealing base (13), and at the moment, the pressure of the compression spring (8) acting on the sealing ball (3) is smaller than the pressure of the working medium for providing the sealing ball (3).
2. 2. The pressure relief device for the ultralow temperature pressure container according to claim 1, wherein the working medium inlet comprises an inlet adapter (2), one end of the inlet adapter (2) is connected with a nut (12) through threads, a second wedge-shaped circular groove (23) is formed in the axis of the inlet adapter, a gland (11) and a clamping sleeve cover (10) are arranged between the inlet adapter (2) and the nut (12), round holes are formed in the axes of the gland (11) and the clamping sleeve cover (10) and used for communicating the working medium source and the cavity, the other end of the inlet adapter (2) is connected with the transition shell (1) through threads, and the second wedge-shaped circular groove (23) is matched with the clamping sleeve cover (10).
3. 3. The pressure relief device for the ultralow temperature pressure container according to claim 2, wherein the sealing base (13) is of a cylindrical structure, a through hole is formed in the axis, the radius of the through hole is smaller than that of the sealing ball (3), a first bulge (19) matched with the inlet adapter (2) is formed in the circumference of the sealing base (13), and a first wedge-shaped circular groove (22) matched with the sealing ball (3) is formed in the sealing base (13).
4. 4. The pressure relief device for the ultralow temperature pressure container according to claim 3, wherein the guide rod (5) has a columnar structure, one end of the guide rod is abutted against the top end head (6), and the other end of the top end head (6) is abutted against the compression spring (8).
5. 5. The pressure relief device for the ultralow temperature pressure container according to claim 4, wherein the top end head (6) is of a cylindrical structure, a first groove (20) is arranged for being matched with the top end of the guide rod (5) to limit the movement direction of the guide rod (5), the top end head (6) is further provided with a second protrusion (21) with a diameter matched with the inner diameter of the compression spring (8), the diameter of the top end head (6) is larger than the outer diameter of the compression spring (8), and the compression spring (8) is sleeved on the second protrusion (21).
6. 6. The pressure relief device for a cryogenic pressure vessel of claim 5, wherein said working medium outlet (15) is a plurality of circular vent holes disposed on the outer periphery of said transition housing (1).
7. 7. The pressure relief device for the ultralow temperature pressure container according to claim 6, wherein the sealing device further comprises a transition sleeve (4), the transition sleeve (4) is of a hexagonal prism-shaped structure, a through hole matched with the outer circumference of the guide rod (5) is formed in the axis, and the transition sleeve (4) is connected with the transition shell (1) through threads.
8. 8. The pressure relief device for the ultralow temperature pressure container according to claim 7, wherein the sealing device further comprises an adjusting support column (7), the adjusting support column (7) is of a columnar structure, a spring gasket (9) is connected to the bottom of the adjusting support column, the compression spring (8) is placed in the inner cavity, and the compression spring (8) is sleeved on a third protrusion (24) of the spring gasket (9).
9. 9. The pressure relief device for a cryogenic pressure vessel according to claim 8, characterized in that the adjusting strut (7) is screwed with the transition sleeve (4) to adjust the compression or expansion of the compression spring (8) by screwing the adjusting strut (7) to form the thrust forces acting on the sealing ball (3) with different magnitudes.
10. 10. The pressure relief device for the ultralow temperature pressure container according to claim 9, wherein the sealing ball (3) is made of ZrO 2 , and the sealing base (13), the transition shell (1), the inlet adapter (2), the guide rod (5), the adjusting support (7) and the transition sleeve (4) are made of high-quality stainless steel 316L.

Description

Pressure relief device for ultralow-temperature pressure container Technical Field The utility model relates to the technical field of pressure reducing devices, in particular to a pressure reducing device of an ultralow-temperature pressure container. Background At present, the pressure release product of the pressure vessel is basically blank under the working condition of low temperature of minus 50 ℃ at home and abroad. Most pressure relief products cannot be used at ultra low temperatures, such as the lowest use temperature of the Swagelok company pressure relief valve is-47 ℃. The pressure relief device is used for pressure relief under the working conditions of low temperature and ultralow temperature of the pressure vessel, and is developed under the working conditions of-250 ℃ to 300 ℃ and 800 to 3000psi in the pressure range, so that the pressure relief device can meet the product used by the pressure vessel in the ultralow temperature environment and is suitable for the ultralow temperature working conditions such as liquid carbon dioxide gasification, liquid nitrogen gasification and the like. Disclosure of utility model The present utility model is directed to alleviating or solving at least one aspect or point of the problems discussed above. Aiming at the defects of the prior art, the pressure relief device which works under the working condition that the temperature interval is-250 ℃ to 300 ℃ and the pressure interval is 800 to 3000psi is provided, the product used by the pressure vessel in the ultra-low temperature environment is satisfied, and the market blank is filled. The utility model discloses a pressure relief device of an ultralow temperature pressure container, which comprises a transition shell, wherein one end of the transition shell is connected with a sealing device, the other end of the transition shell is connected with a working medium inlet which is communicated with a working medium source, the transition shell, the working medium inlet and the sealing device form a cavity, the transition shell is provided with a working medium outlet, the sealing device comprises a sealing ball, one end of the sealing ball is abutted against a sealing base, the other end of the sealing ball is abutted against a guide rod, the other end of the guide rod is connected with a compression spring, and the compression spring compresses or stretches to limit the sealing ball to move back and forth between a first position and a second position; When the sealing ball is positioned at the first position, the sealing ball is abutted with the sealing base to form a sealing structure, working medium in the cavity is limited to leak, and at the moment, the pressure provided by the compression spring to the sealing ball is larger than the pressure of the working medium acting on the sealing ball; When the sealing ball is positioned at the second position, the sealing ball is separated from the sealing base to form a pressure relief gap, working medium in the cavity leaks out through the gap between the sealing ball and the sealing base, and at the moment, the pressure of the compression spring acting on the sealing ball is smaller than the pressure of the working medium for providing the sealing ball. Preferably, the working medium inlet comprises an inlet adapter, one end of the inlet adapter is connected with a nut through threads, a second wedge-shaped circular groove is formed in the axis of the inlet adapter, a gland and a clamping sleeve cover are arranged between the inlet adapter and the nut, a round hole is formed in the axis of the gland and the clamping sleeve cover and used for communicating the working medium source and the cavity, the other end of the inlet adapter is connected with the transition shell through threads, and the second wedge-shaped circular groove is matched with the clamping sleeve cover. Preferably, the sealing base is of a cylindrical structure, a through hole is formed in the axis, the radius of the through hole is smaller than that of the sealing ball, a first bulge matched with the inlet adapter is formed in the circumference of the sealing base, and a first wedge-shaped circular groove matched with the sealing ball is formed in the sealing base. Preferably, the guide rod is of a columnar structure, one end of the guide rod is abutted against the top end head, and the other end of the top end head is abutted against the compression spring. Preferably, the top head is of a cylindrical structure and is provided with a first groove for being matched with the top end of the guide rod to limit the movement direction of the guide rod, the top head is further provided with a second bulge, the diameter of the second bulge is matched with the inner diameter of the compression spring, the diameter of the top head is larger than the outer diameter of the compression spring, and the compression spring is sleeved on the second bulge. Preferably, the working medium outlet is a plur