Multifunctional combination valve for low-temperature tank liquid filling

Abstract

The utility model relates to a kind of multifunctional combination valve for cryogenic storage tank liquid addition. Including: valve body;First ball valve assembly and second ball valve assembly are arranged in the valve body, the first ball valve assembly includes first ball and controls the on-off of exhaust passage, the second ball valve assembly includes second ball and controls the on-off of liquid addition passage;Connecting rod is arranged in the valve body, for connecting the first ball and the second ball, so that the first ball valve assembly and second ball valve assembly can be opened and closed synchronously;Safety valve assembly is integrally arranged in the valve body, the inlet of the safety valve assembly is communicated with the exhaust inlet on the valve body, for pressure relief when the pressure in storage tank exceeds set value.The combination valve highly integrates liquid addition control, exhaust control and safety relief function in one valve body, with compact structure, space saving, light weight, easy installation, easy operation, reduce leakage point and other advantages, especially suitable for small, low pressure, portable cryogenic storage tank.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic fluid transportation and storage equipment technology, and in particular to a multifunctional combination valve for adding liquid to cryogenic storage tanks. Background Technology

[0002] In the field of industrial automation for the storage and transport of cryogenic fluids, ball valves and safety valves are commonly used key components. Ball valves are mainly used to control the flow of fluids, while safety valves are used to release pressure when the system pressure exceeds a set value, ensuring equipment safety.

[0003] In existing technical solutions, the functions of liquid filling, venting, and safety relief in cryogenic storage tanks are typically achieved using independent valves, namely, separate inlet ball valves, vent ball valves, and safety valves. This decentralized installation method has the following significant disadvantages: 1. Multiple independent valves and their connecting pipelines require substantial installation space, which is particularly disadvantageous for small cryogenic storage tanks with limited space. 2. Multiple valve bodies, connectors, and additional piping increase the overall weight of the storage tank, reducing portability. 3. The need to install, connect, and seal multiple valves separately increases installation difficulty and time costs. 4. The connecting pipelines between valves increase potential leakage risk points.

[0004] Therefore, there is an urgent need for a valve device that is compact, lightweight, easy to install, highly integrated, and reliable, in order to solve the problems caused by independent valves in the existing technology and meet the application requirements of small, low-pressure, and portable cryogenic storage tanks. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a multi-functional combination valve for adding liquid to cryogenic storage tanks. This combination valve highly integrates liquid addition control, venting control, and safety relief functions into a single valve body, and has advantages such as compact structure, space saving, light weight, easy installation, convenient operation, and reduced leakage points. It is particularly suitable for small, low-pressure, portable cryogenic storage tanks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] According to one aspect of this utility model, a multi-functional combination valve for adding liquid to a cryogenic storage tank is provided, comprising:

[0008] Valve body;

[0009] A first ball valve assembly and a second ball valve assembly are disposed in the valve body. The first ball valve assembly includes a first ball and controls the opening and closing of the exhaust channel. The second ball valve assembly includes a second ball and controls the opening and closing of the liquid filling channel.

[0010] A connecting rod is disposed in the valve body for connecting the first ball and the second ball, so that the first ball valve assembly and the second ball valve assembly can be opened and closed synchronously;

[0011] A valve stem is inserted through the valve body, with one end connected to the first ball.

[0012] A handle, located at the other end of the valve stem, is used to drive the valve stem to rotate in order to control the opening and closing of the first ball valve assembly and the second ball valve assembly;

[0013] A safety valve assembly is integrated inside the valve body. The inlet of the safety valve assembly is connected to the exhaust inlet on the valve body, and it is used to release pressure when the pressure in the storage tank exceeds a set value.

[0014] Optionally, the first ball valve assembly and the second ball valve assembly constitute a cryogenic double ball valve structure.

[0015] Optionally, the safety valve assembly is a cryogenic safety valve, which can be inverted, upright, or side-mounted.

[0016] Optionally, the multi-functional combination valve further includes a connector disposed within the valve body for pressing down the first ball and / or the second ball to prevent displacement.

[0017] Optionally, the multi-functional combination valve also includes a locking nut, which is disposed on the valve stem to fix the valve stem and prevent it from moving axially.

[0018] Alternatively, the valve body may be made of low-temperature resistant plastic.

[0019] Optionally, the valve body is made of metal and has a low-temperature resistant coating on its surface.

[0020] Optionally, the first sphere and the second sphere are made of low-temperature resistant stainless steel.

[0021] Optionally, the valve body is also provided with at least one additional connection hole for the output of gas from the storage tank.

[0022] Optionally, the liquid filling channel includes a liquid filling inlet and a liquid filling outlet disposed on the valve body; the venting channel includes a venting inlet and a venting outlet disposed on the valve body; and the inlet of the safety valve assembly is directly connected to the venting inlet.

[0023] The advantages of this utility model are:

[0024] 1. The liquid filling ball valve, air vent ball valve and safety valve are highly integrated into one valve body, which greatly reduces the overall size and space occupied by the valve device, making it particularly suitable for small, portable cryogenic storage tanks with limited space.

[0025] 2. The integrated design reduces connecting pipes and unnecessary valve housings, effectively reducing the overall weight of the cryogenic storage tank and improving portability.

[0026] 3. Only one combination valve is needed to realize the functions of liquid addition, venting and safety relief, which simplifies the pipeline design and installation process of the storage tank and reduces installation costs and time.

[0027] 4. The opening and closing of the liquid addition and venting ball valves can be controlled simultaneously with a single handle, making operation simple and quick.

[0028] 5. The integrated design reduces the number of external connecting pipelines between valves, thereby significantly reducing potential leakage points and improving the sealing reliability and safety of the system.

[0029] 6. The valve body is made of low-temperature resistant materials or coatings, which can effectively reduce the transfer of external heat and slow down the vaporization rate of the low-temperature liquid in the storage tank. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a cross-sectional view of the multifunctional combination valve for adding liquid to a cryogenic storage tank according to the present invention.

[0032] In the diagram: 1. Valve body; 2. Connecting rod; 3. Second ball; 4. Connector; 5. First ball; 6. Valve stem; 7. Locking nut; 8. Handle; 9. Safety valve assembly; 10. Liquid filling inlet; 11. Liquid filling outlet; 12. Exhaust inlet; 13. Exhaust outlet. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Example 1:

[0035] like Figure 1 As shown, a multi-functional combination valve for adding liquid to a cryogenic storage tank includes:

[0036] The valve body constitutes the main structure of the combination valve and has corresponding fluid channels inside.

[0037] A first ball valve assembly and a second ball valve assembly are disposed in the valve body. The first ball valve assembly includes a first ball 5 and controls the opening and closing of the exhaust channel. The second ball valve assembly includes a second ball 3 and controls the opening and closing of the liquid filling channel.

[0038] A connecting rod 2 is disposed in the valve body and is used to connect the first ball 5 and the second ball 3, so that the first ball valve assembly and the second ball valve assembly can open and close synchronously. When one ball rotates, the other ball is driven to rotate synchronously through the connecting rod 2.

[0039] The valve stem 6 passes through the valve body, and one end of it is connected to the first ball 5.

[0040] A handle 8 is provided at the other end of the valve stem 6 and is used to drive the valve stem 6 to rotate in order to control the opening and closing of the first ball valve assembly and the second ball valve assembly.

[0041] Safety valve assembly 9 is integrated inside the valve body. The inlet of safety valve assembly 9 is connected to the exhaust inlet 12 on the valve body. It is used to release pressure when the pressure in the storage tank exceeds the set value. When the pressure in the storage tank exceeds the set pressure of safety valve assembly 9, safety valve assembly 9 opens to release gas and keep the pressure in the storage tank within a safe range.

[0042] In this embodiment, the first ball valve assembly and the second ball valve assembly constitute a cryogenic double ball valve structure.

[0043] In this embodiment, the safety valve assembly 9 is a cryogenic safety valve, which can be inverted, upright, or side-mounted.

[0044] In this embodiment, the multi-functional combination valve further includes a connector 4, which is disposed in the valve body and is used to press down the first ball 5 and / or the second ball 3 to prevent them from being displaced.

[0045] In this embodiment, the multi-functional combination valve further includes a locking nut 7, which is disposed on the valve stem 6 to fix the valve stem 6 and prevent it from moving axially.

[0046] In this embodiment, the valve body is made of low-temperature resistant plastic to effectively isolate heat conduction and extend the vaporization time of the low-temperature liquid in the storage tank.

[0047] In this embodiment, the valve body is made of metal with a low-temperature resistant coating on its surface. This effectively isolates heat conduction and prolongs the vaporization time of the cryogenic liquid in the storage tank.

[0048] In this embodiment, the first sphere 5 and the second sphere 3 are made of low-temperature resistant stainless steel to ensure their sealing performance and service life under low-temperature conditions.

[0049] In this embodiment, the valve body is also provided with at least one additional connection hole for the output of gas from the storage tank.

[0050] In this embodiment, the liquid filling channel includes a liquid filling inlet 10 and a liquid filling outlet 11 disposed on the valve body; the venting channel includes a venting inlet 12 and a venting outlet 13 disposed on the valve body; the inlet of the safety valve assembly 9 is directly connected to the venting inlet 12.

[0051] Example 2,

[0052] like Figure 1 As shown, a multi-functional combination valve for adding liquid to a cryogenic storage tank is disclosed. The valve body serves as the base of the entire combination valve and is internally machined with a liquid filling channel connecting the liquid filling inlet 10 and the liquid filling outlet 11, an exhaust channel connecting the exhaust inlet 12 and the exhaust outlet 13, and a chamber for accommodating various components. The liquid filling channel is controlled by a second ball 3, and the exhaust channel is controlled by a first ball 5. A connecting rod 2 is located inside the valve body, with both ends connected to the first ball 5 and the second ball 3, respectively, enabling them to rotate synchronously. A valve stem 6 passes through a hole in the valve body, with its lower end connected to the first ball 5 and its upper end fixed with a handle 8. By rotating the handle 8, the valve stem 6, the first ball 5, the connecting rod 2, and the second ball 3 can be rotated synchronously, achieving synchronous opening or closing of the double-ball valve. A locking nut 7 is screwed onto the valve stem 6 to fix it and prevent axial movement. A connector 4 is pressed against the outside of the first ball 5 and / or the second ball 3 to prevent displacement of the balls under fluid pressure and ensure a tight seal. The safety valve assembly 9 is directly integrated into a specific chamber inside the valve body, and its inlet is directly connected to the exhaust inlet 12 on the valve body. The safety valve assembly 9 adopts an inverted, upright, or side-mounted structure, suitable for cryogenic gas venting.

[0053] In this embodiment, the working principle of the multi-functional combination valve is as follows: When liquid needs to be added to the cryogenic storage tank, rotate the handle 8 clockwise or counterclockwise by approximately 90 degrees. This causes the valve stem 6 to rotate the first ball 5 and the connecting rod 2, which in turn causes the second ball 3 to rotate synchronously, thus opening the double-ball valve. The cryogenic liquid flows in from the filling inlet 10 of the valve body, passes through the filling channel where the second ball 3 is located, and enters the tank through the filling outlet 11. Simultaneously, the gas expelled from the tank enters the valve body from the exhaust inlet 12, passes through the exhaust channel where the first ball 5 is located, and is discharged to the atmosphere or recovery system through the exhaust outlet 13. After the liquid addition is completed, rotate the handle 8 in the opposite direction by approximately 90 degrees, causing the first ball 5 and the second ball 3 to rotate synchronously to the closed position, cutting off the filling and exhaust channels.

[0054] During the storage tank's resting or operational phases, the cryogenic liquid inside continuously vaporizes, causing the pressure in the vapor space to rise. When the pressure inside the tank is transmitted to the inlet of the safety valve assembly 9 through the exhaust inlet 12 and reaches its preset opening pressure, the valve disc of the safety valve assembly 9 is pushed open against the spring force, and the overpressure gas is discharged through the vent of the safety valve assembly 9 until the pressure inside the tank drops below the closing pressure of the safety valve, at which point the safety valve assembly 9 automatically closes. This process ensures that the pressure inside the storage tank remains within a safe range.

[0055] The valve body can be made of engineering plastics with excellent low-temperature resistance and low thermal conductivity, such as reinforced polytetrafluoroethylene (PTFE) or PEEK, to minimize heat conduction; or it can be made of metal, such as stainless steel or aluminum alloy, with a low-temperature resistant insulating coating applied to its inner and outer surfaces. The first ball 5 and the second ball 3 are made of low-temperature resistant stainless steel to ensure strength and sealing performance at low temperatures. Other metal components should also be made of low-temperature resistant materials.

[0056] One or more additional connection holes can be added to the valve body. These holes can be connected to the gas phase space of the storage tank for outputting gas from the storage tank when needed.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A multi-functional combination valve for adding liquid to cryogenic storage tanks, characterized in that, include: Valve body; A first ball valve assembly and a second ball valve assembly are disposed in the valve body. The first ball valve assembly includes a first ball and controls the opening and closing of the exhaust channel. The second ball valve assembly includes a second ball and controls the opening and closing of the liquid filling channel. A connecting rod is disposed in the valve body for connecting the first ball and the second ball, so that the first ball valve assembly and the second ball valve assembly can be opened and closed synchronously; A valve stem is inserted through the valve body, with one end connected to the first ball. A handle, located at the other end of the valve stem, is used to drive the valve stem to rotate in order to control the opening and closing of the first ball valve assembly and the second ball valve assembly; A safety valve assembly is integrated inside the valve body. The inlet of the safety valve assembly is connected to the exhaust inlet on the valve body, and it is used to release pressure when the pressure in the storage tank exceeds a set value.

2. The multifunctional combination valve according to claim 1, characterized in that, The first ball valve assembly and the second ball valve assembly constitute a cryogenic double ball valve structure.

3. The multifunctional combination valve according to claim 1 or 2, characterized in that, The safety valve assembly is a cryogenic safety valve, which can be inverted, upright, or side-mounted.

4. The multifunctional combination valve according to claim 1, characterized in that, The multi-functional combination valve also includes a connector disposed within the valve body for pressing down the first ball and / or the second ball to prevent displacement.

5. The multifunctional combination valve according to claim 1, characterized in that, The multi-functional combination valve also includes a locking nut, which is disposed on the valve stem to fix the valve stem and prevent it from moving axially.

6. The multifunctional combination valve according to claim 1, characterized in that, The valve body is made of low-temperature resistant plastic.

7. The multifunctional combination valve according to claim 1, characterized in that, The valve body is made of metal and has a low-temperature resistant coating on its surface.

8. The multifunctional combination valve according to claim 1, characterized in that, The first sphere and the second sphere are made of low-temperature resistant stainless steel.

9. The multifunctional combination valve according to claim 1, characterized in that, The valve body is also provided with at least one additional connection hole for the output of gas from the storage tank.

10. The multifunctional combination valve according to claim 1, characterized in that, The liquid filling channel includes a liquid filling inlet and a liquid filling outlet disposed on the valve body; the venting channel includes a venting inlet and a venting outlet disposed on the valve body; the inlet of the safety valve assembly is directly connected to the venting inlet.

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