Economic valve for cryogenic fluid storage tank

Abstract

The utility model discloses an economic valve for a low-temperature fluid storage tank, and belongs to the field of low-temperature valves, the economic valve comprises a valve body and a valve cover mounted on the valve body, a sealing gasket is tightly pressed at the joint of the valve body and the valve cover, and a diaphragm, a diaphragm cover plate, a diaphragm pressing plate, a pressure adjusting spring and a pressure stabilizing assembly pressure adjusting bolt are sequentially arranged above the sealing gasket. The diaphragm is used for isolating gas flow between the valve body and the valve cover, the diaphragm cover plate is used for pressing the diaphragm and limiting the pressure adjusting spring, the diaphragm pressing plate is used for limiting the diaphragm cover plate, the pressure adjusting bolt penetrates through the top of the valve cover, and tensioning of the pressure adjusting spring is adjusted through the pressure stabilizing assembly; an air inlet flow channel and an air outlet flow channel are formed in the valve body, a valve rod is arranged in the air outlet flow channel, a boss is arranged in the middle of the valve rod and used for limiting an upper jacking spring at the lower end, and a step is arranged at the top end of the air outlet flow channel and used for containing a sealing ball.

Description

Technical Field

[0001] The invention belongs to the field of cryogenic valves, and in particular relates to a new structure of an economical valve for a cryogenic fluid storage tank. Background Art

[0002] With the rapid development of society, new energy sources such as liquefied natural gas (LNG) and other cryogenic liquefied gases have attracted attention and are widely used. As a key component of cryogenic fluid (including gas and liquid) storage tanks, economic valves play a role in controlling and regulating the pressure of cryogenic fluid storage tanks. Currently, economic valves on cryogenic fluid storage tanks on the market are mostly soft seals, using sealing gaskets made of low-temperature-resistant plastic materials. These can be further divided into flat soft seals and conical soft seals. Because soft seals are made of plastic, they have the following disadvantages:

[0003] 1. Plastic gaskets that are in contact with the metal sealing surface of the valve body for a long time will wear out and reduce their service life.

[0004] 2. Plastic gaskets are prone to deformation, which changes the compression of the spring and causes inaccurate pressure adjustment, thus affecting the normal use of the equipment;

[0005] 3. Plastic materials are more likely to generate static electricity on the surface and absorb impurities than metal materials, which will cause the sealing surface to be contaminated and unable to perform the sealing function.

[0006] Some valves use metal-to-metal sealing. For example, Chinese patent CN 207648144 discloses a low-temperature economic valve. However, because the lower portion of the valve core is conical to form a seal with the outlet flow channel, the upper portion of the valve core can only be a regular hexagon or a regular quadrilateral. In this case, the valve core occupies most of the space in the outlet flow channel, resulting in a slow outlet flow rate and low efficiency.

[0007] Therefore, there is an urgent need on the market for a hard-sealed valve body structure that can quickly release air. Summary of the Invention

[0008] In response to the above technical problems, the purpose of the present invention is to provide an economical valve for cryogenic fluid storage tanks that uses a hard seal, a sealing pair using a stainless steel ball or a spherical surface similar to a ball, or a natural indentation produced by a conical body of stainless steel and a copper body, which can achieve complete fit.

[0009] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: an economic valve for a cryogenic fluid storage tank, comprising a valve body and a valve cover mounted on the valve body, wherein a sealing gasket is pressed at the connection between the valve body and the valve cover, and a diaphragm, a diaphragm cover plate, a diaphragm pressure plate, a pressure-regulating spring, and a pressure-regulating bolt of a pressure-stabilizing assembly are sequentially arranged above the sealing gasket, wherein the diaphragm is used to isolate the gas flow between the valve body and the valve cover, the diaphragm cover plate is used to press the diaphragm and the limiting pressure-regulating spring, the diaphragm pressure plate is used to limit the diaphragm cover plate, the pressure-regulating bolt passes through the top of the valve cover, and the tension of the pressure-regulating spring is adjusted by the pressure-stabilizing assembly;

[0010] An inlet flow channel and an outlet flow channel are provided inside the valve body. A valve stem is provided in the outlet flow channel. A boss is provided in the middle of the valve stem. The boss is used to limit the upper spring at the lower end. A step is provided at the top of the outlet flow channel. The step is used to place a sealing ball.

[0011] As a preferred structure of the present invention, the diaphragms are copper diaphragms with a thickness of 0.1 mm to 0.2 mm and a number of 3 to 5.

[0012] As a preferred structure of the present invention, the diaphragm cover plate is provided with a primary step and a secondary step, the primary step is used to limit the pressure regulating spring, and the secondary step is connected to the diaphragm pressure plate.

[0013] As a preferred structure of the present invention, the diaphragm pressure plate includes a plane portion and a limiting portion, the plane portion and the limiting portion are integrally formed, the plane portion is connected to the diaphragm, and the limiting portion is connected to the secondary step.

[0014] As a preferred structure of the present invention, the voltage stabilizing assembly includes a spring pressure cover, the spring pressure cover is provided with a hemispherical groove for accommodating a voltage stabilizing ball, and the upper end of the voltage stabilizing ball is connected to the pressure regulating bolt.

[0015] As a preferred structure of the present invention, the diameter of the sealing ball is slightly larger than the distance from the diaphragm to the bottom surface of the step.

[0016] As a preferred structure of the present invention, the sealing ball is made of stainless steel, and the valve body is made of brass.

[0017] In order to achieve the above-mentioned object, the present invention further provides an economic valve for a cryogenic fluid storage tank, comprising a valve body and a valve cover mounted on the valve body, wherein a sealing gasket is pressed at the connection between the valve body and the valve cover, and a diaphragm, a diaphragm cover plate, a diaphragm pressure plate, a pressure-regulating spring, and a pressure-regulating bolt of a pressure-stabilizing assembly are sequentially arranged above the sealing gasket, wherein the diaphragm is used to isolate the gas flow between the valve body and the valve cover, the diaphragm cover plate is used to press the diaphragm and the limiting pressure-regulating spring, the diaphragm pressure plate is used to limit the diaphragm cover plate, the pressure-regulating bolt passes through the top of the valve cover, and the tension of the pressure-regulating spring is adjusted by the pressure-stabilizing assembly;

[0018] The valve body is provided with an inlet and outlet flow passages, and a sealing assembly is provided on the top of the outlet flow passage. The sealing assembly includes a spring, a sealing ball and a sealing ball wrapping member, the sealing ball is fixedly connected to the sealing ball wrapping member, and the sealing ball wrapping member moves up and down via the spring.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The seal of the present invention adopts stainless steel balls, which have high hardness and will not cause wear when in high-frequency contact with the brass valve body, so the service life is greatly improved;

[0021] 2. The seal of the present invention adopts stainless steel balls, which are relatively strong and not easily deformed when in high-frequency contact with the brass valve body. This makes the set pressure of the valve very stable during long-term use, thereby ensuring the normal operation of the equipment.

[0022] 3. In the present invention, the stainless steel ball is made of metal, and its surface is not prone to static electricity and adsorption of impurities, thereby greatly preventing the sealing surface from being contaminated. Impurities stuck on the sealing surface make the valve unable to close and continue to release pressure, affecting the normal operation of the equipment;

[0023] 4. In the present invention, the stainless steel balls do not occupy the air outlet space of the air outlet channel, and can achieve the effect of rapid air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram A of the overall structure of an economic valve for a cryogenic fluid storage tank in this embodiment.

[0025] Figure 2 FIG. 1 is another overall structural schematic diagram B of an economic valve for a cryogenic fluid storage tank in this embodiment.

[0026] Figure 3 This is an exploded view of the local structure (3-6) of an economic valve for a cryogenic fluid storage tank in this embodiment.

[0027] Among them, 1 is the valve body; 2 is the valve cover; 3 is the sealing gasket; 4 is the diaphragm; 5 is the diaphragm cover plate; 6 is the diaphragm pressure plate; 7 is the pressure regulating spring; 8 is the pressure stabilizing assembly; 9 is the pressure regulating bolt;

[0028] 11 is the inlet flow channel; 12 is the outlet flow channel; 13 is the valve stem; 14 is the boss; 15 is the upper spring; 16 is the step; 17 is the sealing ball; 51 is the first step; 52 is the second step; 61 is the flat part; 62 is the limit part; 81 is the spring cover; 82 is the pressure-stabilizing ball;

[0029] 18 is a sealing assembly; 181 is a spring; 182 is a sealing ball; 183 is a sealing ball package. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features, achieved objectives and effects of the technical solution in detail, the following is a detailed description in conjunction with specific embodiments and accompanying drawings.

[0031] Example 1: Figure 1 As shown, the overall structural diagram A of an economic valve for a cryogenic fluid storage tank in this embodiment includes a valve body 1 and a valve cover 2 installed on the valve body 1. A sealing gasket 3 is pressed at the connection between the valve body 1 and the valve cover 2. A diaphragm 4, a diaphragm cover plate 5, a diaphragm pressure plate 6, a pressure regulating spring 7, a pressure stabilizing assembly 8 and a pressure regulating bolt 9 are sequentially arranged above the sealing gasket 3. The diaphragm 4 is used to isolate the gas flow between the valve body 1 and the valve cover 2, and the diaphragm cover plate 5 is used to press the diaphragm 4 and the limit pressure regulating spring. 7. The diaphragm pressure plate 6 is used to limit the diaphragm cover plate 5. The pressure-regulating bolt 9 passes through the top of the valve cover 2, and the tension of the pressure-regulating spring 7 is adjusted by the pressure-stabilizing component 8. The valve body 1 is provided with an inlet flow channel 11 and an outlet flow channel 12. A valve stem 13 is provided in the outlet flow channel 12, and a boss 14 is provided in the middle of the valve stem 13. The boss 14 is used to limit the upper spring 15 at the lower end. The top of the outlet flow channel 12 is provided with a step 16, and the step 16 is used to place a sealing ball 17.

[0032] As a preferred structure of this embodiment, the diaphragms 4 are made of copper, with a thickness of 0.1mm-0.2mm and a number of 3-5. The number is set to prevent the situation where a single diaphragm cannot withstand the air pressure due to excessive air intake and ruptures.

[0033] As a preferred structure of this embodiment, the diaphragm pressure plate 6 is provided with a primary step 61 and a secondary step 62 . The primary step 61 is used to limit the pressure-regulating spring 7 , and the secondary step 62 is connected to the diaphragm cover plate 5 .

[0034] As a preferred structure of this embodiment, the diaphragm cover plate 5 includes a planar portion 51 and a limiting portion 52 . The planar portion 51 and the limiting portion 52 are integrally formed. The planar portion 51 is connected to the diaphragm 4 , and the limiting portion 52 is connected to the secondary step 62 .

[0035] As a preferred structure of this embodiment, the pressure stabilizing assembly 8 includes a spring pressure cap 81, which is provided with a hemispherical groove for accommodating a pressure stabilizing ball 82. The upper end of the pressure stabilizing ball 82 is connected to the pressure regulating bolt 9. The cooperation between the spring pressure cap 81 and the pressure stabilizing ball 82 can ensure that the pressure regulating spring 7 is evenly stressed.

[0036] As a preferred structure of this embodiment, the diameter of the sealing ball 17 is slightly larger than the distance from the diaphragm 4 to the bottom surface of the step 16 .

[0037] As a preferred structure of this embodiment, the sealing ball 17 is made of stainless steel, and the valve body 1 is made of brass.

[0038] The working principle of this embodiment is:

[0039] First, before the valve body of the economic valve of this embodiment is in the intake position, the upper spring 15 is in a tightened state, which will continue to apply an upward force to the sealing ball 17, but it is still smaller than the downward force applied to the sealing ball 17 by the pressure-regulating spring 7, so the sealing ball 17 forms a sealed state with the outlet flow channel 12.

[0040] The low-temperature medium enters the valve body cavity from the inlet flow channel 11. Due to the action of the diaphragm 4 and the sealing gasket 3, the medium cannot enter the outside of the valve body and the inside of the valve cover 2. When the pressure of the medium entering the valve body 1 and the upper push spring 15 applied to the diaphragm 4 is less than the pressure of the pressure-regulating spring 7 on the diaphragm 4, the sealing ball 17 is in close contact with the sealing surface inside the valve body 1, and the medium entering the valve body 1 from the inlet flow channel 11 is blocked inside the valve body 1, thereby realizing the closing function of the valve; when the pressure of the medium entering the valve body 1 and the upper push spring 15 applied to the diaphragm 4 is greater than the pressure of the pressure-regulating spring 7 on the diaphragm 4, the sealing ball 17 is separated from the sealing surface inside the valve body 1, and the medium entering the valve body 1 from the inlet flow channel 11 can flow out through the outlet flow channel 12, thereby realizing the pressure relief function of the valve.

[0041] Example 2: This example differs from Example 1 in the valve body structure. In this example, the valve body 1 is provided with an inlet flow channel 11 and an outlet flow channel 12. A sealing assembly 18 is provided at the top of the outlet flow channel 12. The sealing assembly 18 includes a spring 181, a sealing ball 182, and a sealing ball wrapping member 183. The sealing ball 182 is fixedly connected to the sealing ball wrapping member 183, and the sealing ball wrapping member 183 is moved up and down by the spring 181.

[0042] The working principle of this embodiment is the same as that of the first embodiment.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An economic valve for a cryogenic fluid storage tank, comprising a valve body (1) and a valve cover (2) mounted on the valve body (1), characterized in that: The connection between the valve body (1) and the valve cover (2) is compressed with a sealing gasket (3), and a diaphragm (4), a diaphragm cover plate (5), a diaphragm pressure plate (6), a pressure regulating spring (7), a pressure stabilizing assembly (8), and a pressure regulating bolt (9) are sequentially arranged above the sealing gasket (3). The diaphragm (4) is used to isolate the gas flow between the valve body (1) and the valve cover (2), the diaphragm cover plate (5) is used to compress the diaphragm (4) and the limiting pressure regulating spring (7), the diaphragm cover plate (5) is used to limit the diaphragm pressure plate (6), and the pressure regulating bolt (9) passes through the top of the valve cover (2) and adjusts the tension of the pressure regulating spring (7) through the pressure stabilizing assembly (8); An inlet flow channel (11) and an outlet flow channel (12) are provided inside the valve body (1), a valve stem (13) is provided in the outlet flow channel (12), a boss (14) is provided in the middle of the valve stem (13), the boss (14) is used to limit the upper spring (15) at the lower end, and a step (16) is provided at the top end of the outlet flow channel (12), and the step (16) is used to place a sealing ball (17).

2. The economic valve for a cryogenic fluid storage tank according to claim 1, characterized in that: The diaphragms (4) are copper diaphragms with a thickness of 0.1 mm to 0.2 mm and a number of 3 to 5.

3. The economic valve for a cryogenic fluid storage tank according to claim 1, characterized in that: The diaphragm pressure plate (6) is provided with a first step (61) and a second step (62), the first step (61) is used to limit the pressure regulating spring (7), and the second step (62) is connected to the diaphragm cover plate (5).

4. The economic valve for a cryogenic fluid storage tank according to claim 3, characterized in that: The diaphragm cover plate (5) comprises a plane portion (51) and a limiting portion (52), wherein the plane portion (51) and the limiting portion (52) are integrally formed, the plane portion (51) is connected to the diaphragm (4), and the limiting portion (52) is connected to the secondary step (62).

5. The economic valve for a cryogenic fluid storage tank according to claim 1, characterized in that: The pressure stabilizing assembly (8) includes a spring pressure cover (81), wherein the spring pressure cover (81) is provided with a hemispherical groove for accommodating a pressure stabilizing ball (82), and the upper end of the pressure stabilizing ball (82) is connected to a pressure regulating bolt (9).

6. The economic valve for a cryogenic fluid storage tank according to claim 1, characterized in that: The diameter of the sealing ball (17) is slightly larger than the distance from the diaphragm (4) to the bottom surface of the step (16).

7. The economic valve for a cryogenic fluid storage tank according to claim 1, characterized in that: The sealing ball (17) is made of stainless steel, and the valve body (1) is made of brass.

8. An economic valve for a cryogenic fluid storage tank, comprising a valve body (1) and a valve cover (2) mounted on the valve body (1), characterized in that: The connection between the valve body (1) and the valve cover (2) is compressed with a sealing gasket (3), and a diaphragm (4), a diaphragm cover (5), a diaphragm pressure plate (6), a pressure regulating spring (7), a pressure stabilizing assembly (8) and a pressure regulating bolt (9) are sequentially arranged above the sealing gasket (3), the diaphragm (4) is used to isolate the gas flow between the valve body (1) and the valve cover (2), the diaphragm pressure plate (6) is used to compress the diaphragm (4) and the limiting pressure regulating spring (7), the diaphragm cover (5) is used to limit the diaphragm pressure plate (6), and the pressure regulating bolt (9) passes through the top of the valve cover (2) and adjusts the tension of the pressure regulating spring (7) through the pressure stabilizing assembly (8); An inlet flow channel (11) and an outlet flow channel (12) are provided inside the valve body (1), and a sealing component (18) is provided at the top of the outlet flow channel (12).

9. The economic valve for a cryogenic fluid storage tank according to claim 8, characterized in that: The sealing assembly (18) comprises a spring (181), a sealing ball (182) and a sealing ball wrapping piece (183); the sealing ball (182) is fixedly connected to the sealing ball wrapping piece (183); and the sealing ball wrapping piece (183) moves up and down via the spring (181).

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