Low temperature stop valve

Abstract

The utility model relates to valve technical field especially relates to a low temperature stop valve, including valve cavity, the liquid inlet end of setting in valve cavity one end, the liquid outlet end of setting in valve cavity other end, is provided with the liaison channel between the liquid inlet end and the liquid outlet end, the base station of installing on valve cavity, the operating assembly of swing joint on valve cavity, install one's mind fills and discharges gas subassembly and install in the air bag of valve cavity, one's mind fills and discharges gas subassembly with air bag intercommunication, operating assembly is used for opening or closing liaison channel, the utility model discloses through the movement of operating assembly, under the condition that the liaison channel is closed in valve body, the air bag inflation expands, can extrude the fluid medium in valve cavity part from valve cavity, avoid a large number of fluid medium to remain in valve cavity, cause the valve cavity water vapor to freeze in the valve cavity and damage, or the operating assembly is difficult to move.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a cryogenic shut-off valve. Background Technology

[0002] Cryogenic shut-off valves are valves specifically designed to operate in extremely low temperature environments. They are commonly used in systems for the transmission of liquefied natural gas (LNG), liquid oxygen, liquid nitrogen, and other cryogenic media. Therefore, this type of shut-off valve often operates at very low temperatures.

[0003] If a cryogenic shut-off valve is improperly designed or used, the internal fluid medium temperature is relatively low, and the air in the valve is mixed with water vapor. This water vapor is prone to freezing when it comes into contact with cryogenic materials such as liquid hydrogen, which may cause the valve to jam or become inflexible in operation. This is especially true when the valve is in the closed state, when a certain amount of stagnant cryogenic fluid medium is stored in the internal valve cavity, and the air and water vapor in the valve are also in a stagnant state, making it even easier for the water vapor to freeze, resulting in the valve being difficult to open.

[0004] Therefore, to address the above problems, a device can be designed that can remove some of the fluid medium inside the valve cavity and promote the flow of residual air and water vapor when the low-temperature shut-off valve is closed, thereby reducing the impact of water vapor freezing on the valve. Utility Model Content

[0005] To overcome the problem that when the cryogenic shut-off valve is closed, the cryogenic medium and residual water vapor in the valve chamber do not flow, and the water vapor is prone to freezing, making the shut-off valve difficult to open.

[0006] The technical solution of this utility model is as follows: a cryogenic shut-off valve includes a valve cavity, an inlet end disposed at one end of the valve cavity, an outlet end disposed at the other end of the valve cavity, a communication channel provided between the inlet end and the outlet end, a base mounted on the valve cavity, a control component movably connected to the valve cavity, a first inflation / deflation component mounted on the control component, and an airbag mounted in the valve cavity. The first inflation / deflation component is connected to the airbag. The control component is used to open or close the communication channel. When the control component opens the communication channel, gas in the airbag flows into the first inflation / deflation component. When the control component opens the communication channel, gas in the first inflation / deflation component flows into the airbag. A second inflation / deflation component and a drive component are mounted on the control component. The input end of the second inflation / deflation component is connected to the output end of the drive component. The second inflation / deflation component is connected to the first inflation / deflation component. The drive component is used to control the flow of gas between the first inflation / deflation component and the second inflation / deflation component.

[0007] Preferably, the control assembly includes a valve stem movably connected to the valve chamber, a valve head fixedly connected to one end of the valve stem, a handwheel fixedly connected to the other end of the valve stem, and a movable platform fixedly connected to the valve stem. The handwheel controls the valve head to move closer to or further away from the communication channel via the valve stem. When the valve head moves closer to the communication channel, the movable platform moves closer to the base; when the valve head moves away from the communication channel, the movable platform moves away from the base.

[0008] Preferably, the first inflation / deflation assembly includes an air hood mounted on a moving platform and an air supply pipe connected at one end to the air hood. The other end of the air hood is connected to the base, and the other end of the air supply pipe is connected to the air bladder. Gas flows between the air hood and the air bladder through the air supply pipe. When the moving platform approaches the base, the gas in the air hood flows into the air bladder. When the moving platform moves away from the base, the gas in the air bladder flows into the air hood.

[0009] Preferably, the second inflation / deflation assembly includes an air chamber mounted on a moving platform, a bracket fixedly connected to the air chamber, a linkage assembly movably connected to the air chamber, and a transmission assembly movably connected to the bracket. The input end of the linkage assembly is connected to the output end of the transmission assembly, and the input end of the transmission assembly is connected to the output end of the drive assembly. The drive assembly is used to drive the transmission assembly to rotate, and the transmission assembly is used to drive the linkage assembly to move within the air chamber.

[0010] Preferably, the linkage assembly includes a plunger movably connected to the air chamber, a plug head fixedly connected to one end of the plunger, and a rocker arm movably connected to the other end of the plunger. The plug head is disposed inside the air chamber, and the rocker arm is movably connected to the output end of the transmission assembly. The transmission assembly is used to drive the rocker arm to swing, and the rocker arm drives the plug head to move inside the air chamber through the plunger. When the plug head moves downward, the gas in the air chamber flows into the air shroud; when the plug head moves upward, the gas in the air shroud flows into the air chamber.

[0011] Preferably, the transmission assembly includes a turntable movably connected to the bracket and an input bevel gear fixedly mounted on the turntable. The rocker arm is movably connected to the eccentric position of the turntable. The input bevel gear is connected to the output end of the drive assembly. The drive assembly drives the turntable to rotate through the input bevel gear, and the turntable drives the rocker arm to swing.

[0012] Preferably, the drive assembly includes a motor mounted on the moving platform and an output bevel gear mounted on the output end of the motor. The output bevel gear meshes with the input bevel gear, and the motor drives the input bevel gear to rotate through the output bevel gear.

[0013] Preferably, a contact switch A is installed on the control component and a contact switch B is installed on the base. When the control component closes the communication channel, contact switch A and contact switch B make contact and are energized, and send a signal to the motor control unit.

[0014] Preferably, a second signal module is installed on the linkage component, and a heat generator is installed on the base. The second signal module is used to detect the movement status of the linkage component and send a signal to the control unit of the heat generator. The heat generator is used to heat the gas in the first charging and discharging component. When the linkage component moves to the preset position H1, the heat generator is activated. When the linkage component moves to the preset position H2, the heat generator is deactivated.

[0015] Preferably, the second signal module includes a tension spring and a tension sensor mounted on the plug head. The tension sensor is used to detect the tension value of the tension spring. When the plug head moves to the preset position H1, the tension sensor detects the tension value of the tension spring as F1. When the plug head moves to the preset position H2, the tension sensor detects the tension value of the tension spring as F2.

[0016] The beneficial effects of this utility model are:

[0017] 1. By moving the control component, when the communication channel in the valve body is closed, the air bladder inflates and expands, which can squeeze out a portion of the fluid medium in the valve cavity, thus avoiding a large amount of fluid medium remaining in the valve cavity, which could cause water vapor in the valve cavity to freeze and damage the valve cavity, or make it difficult to move the control component.

[0018] 2. By closing the valve body, a signal is output to the drive component to control the second inflation / deflation component to reciprocate the inflation and deflation of the airbag through the first inflation / deflation component. The expansion and contraction of the airbag can promote the flow of fluid medium and water vapor. By increasing the water vapor flow rate, the possibility of water vapor freezing due to stasis is reduced. At the same time, the flowing low temperature medium will also prevent local overcooling of the valve structure, which also helps to reduce the risk of freezing.

[0019] 3. By combining the movement of the linkage components with the No. 2 signal module, the gas can be heated by the heat generator while the airbag is being inflated. The heated airbag can also effectively prevent residual water vapor from freezing inside the valve chamber. Attached Figure Description

[0020] Figure 1 The diagram shown is a three-dimensional structural schematic of the cryogenic shut-off valve of this utility model.

[0021] Figure 2 The diagram shown is a cross-sectional view of the cryogenic shut-off valve of this utility model.

[0022] Figure 3 The diagram shown is a cross-sectional view of the cryogenic shut-off valve of this utility model.

[0023] Figure 4 The diagram shown is a structural schematic of the cryogenic shut-off valve control assembly and the first charging / discharging assembly of this utility model.

[0024] Figure 5 The diagram shown is a structural schematic of the first and second charging / discharging components of the cryogenic shut-off valve of this utility model.

[0025] Figure 6 The diagram shown is a schematic representation of the structure of the cryogenic shut-off valve air chamber and linkage assembly of this utility model.

[0026] Figure 7 The present invention relates to a cryogenic shut-off valve. Figure 2 Enlarged view of point A in the middle;

[0027] Figure 8 The present invention relates to a cryogenic shut-off valve. Figure 3 Enlarged diagram of point B in the middle.

[0028] Explanation of reference numerals in the attached drawings: 101, valve chamber; 102, inlet end; 103, outlet end; 104, valve head; 105, valve stem; 106, handwheel; 107, base; 108, moving platform; 201, air hood; 202, air supply pipe; 203, air bag; 301, air chamber; 302, bracket; 303, plunger; 304, plug head; 305, turntable; 306, input bevel gear; 307, rocker arm; 401, motor; 402, output bevel gear; 501, contact switch A; 502, contact switch B; 601, tension spring; 602, tension sensor; 701, heat generating device. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] Please see Figures 1-8This utility model provides an embodiment: a cryogenic shut-off valve, including a valve chamber 101, an inlet end 102 disposed at one end of the valve chamber 101, an outlet end 103 disposed at the other end of the valve chamber 101, a communication channel provided between the inlet end 102 and the outlet end 103, a base 107 mounted on the valve chamber 101, a control component movably connected to the valve chamber 101, a first inflation / deflation component mounted on the control component, and an airbag 203 mounted in the valve chamber 101. The first inflation / deflation component communicates with the airbag 203. The control component is used to open or close the communication channel; when the control component opens the communication channel, gas in the airbag 203 flows into the first inflation / deflation component; when the control component opens the communication channel, the first inflation / deflation component... Gas flows into the airbag 203. The control component is equipped with a second inflation / deflation component and a drive component. The input end of the second inflation / deflation component is connected to the output end of the drive component. The second inflation / deflation component is connected to the first inflation / deflation component. The drive component is used to control the flow of gas between the first inflation / deflation component and the second inflation / deflation component. The user opens and closes the communication channel on the valve body through the control component. When the communication channel is closed, the first inflation / deflation component inputs gas into the airbag 203, causing the airbag 203 to push out the low-temperature fluid medium in the valve chamber 101. Then the drive component controls the second inflation / deflation component to continuously input or extract gas from the first inflation / deflation component, causing the airbag 203 to continuously expand or contract, promoting the flow of the low-temperature fluid medium.

[0031] Please see Figures 1-5 and Figures 7-8In this embodiment, the control assembly includes a valve stem 105 movably connected to the valve chamber 101, a valve head 104 fixedly connected to one end of the valve stem 105, a handwheel 106 fixedly connected to the other end of the valve stem 105, and a movable platform 108 fixedly connected to the valve stem 105. The handwheel 106 controls the valve head 104 to move closer to or further away from the communication channel via the valve stem 105. When the valve head 104 moves closer to the communication channel, the movable platform 108 moves closer to the base 107; when the valve head 104 moves away from the communication channel, the movable platform 108 moves away from the base 107. The first inflation / deflation assembly includes an air hood 201 mounted on the movable platform 108 and an air supply pipe 202 connected at one end to the air hood 201. The other end of the air hood 201 is connected to the base 107, and the other end of the air supply pipe 202 is connected to the airbag 2. On 03, gas flows between the gas cover 201 and the air bladder 203 through the gas supply pipe 202. When the moving platform 108 approaches the base 107, the gas in the gas cover 201 flows into the air bladder 203. When the moving platform 108 moves away from the base 107, the gas in the air bladder 203 flows into the gas cover 201. During the process of the valve stem 105 controlling the valve head 104 to move downward to close the communication channel, the moving platform 108 moves together with the valve stem 105, and cooperates with the base 107 to generate a counter-pressure effect on the gas cover 201. The gas in the gas cover 201 flows into the air bladder 203 through the gas supply pipe 202, causing the air bladder 203 to expand and push out the residual low temperature fluid medium in the valve chamber 101. When the valve stem 105 moves upward, the valve head 104 opens the communication channel, and at the same time, the air bladder 203 contracts.

[0032] Please see Figures 2-8In this embodiment, the second inflation / deflation assembly includes an air chamber 301 mounted on a moving platform 108, a bracket 302 fixedly connected to the air chamber 301, a linkage assembly movably connected to the air chamber 301, and a transmission assembly movably connected to the bracket 302. The input end of the linkage assembly is connected to the output end of the transmission assembly, and the input end of the transmission assembly is connected to the output end of the drive assembly. The drive assembly is used to drive the transmission assembly to rotate, and the transmission assembly is used to drive the linkage assembly to move within the air chamber 301. The linkage assembly includes a plunger 303 movably connected to the air chamber 301, a plug 304 fixedly connected to one end of the plunger 303, and a plug 304 movably connected to the plunger 303. The rocker arm 307 at the other end has a plug 304 disposed within the air chamber 301. The rocker arm 307 is movably connected to the output end of the transmission assembly, which drives the rocker arm 307 to swing. The rocker arm 307 drives the plug 304 to move within the air chamber 301 via the plunger 303. When the plug 304 moves downward, gas in the air chamber 301 flows into the air shroud 201; when the plug 304 moves upward, gas in the air shroud 201 flows into the air chamber 301. The transmission assembly includes a turntable 305 movably connected to the bracket 302 and an input bevel gear 306 fixedly mounted on the turntable 305. The rocker arm 307 is movably connected to an eccentric position on the turntable 305. The input bevel gear 306 is connected to the output end of the drive assembly. The drive assembly drives the turntable 305 to rotate via the input bevel gear 306, and the turntable 305 drives the rocker arm 307 to swing. The drive assembly includes a motor 401 mounted on the moving platform 108 and an output bevel gear 402 mounted on the output end of the motor 401. The output bevel gear 402 meshes with the input bevel gear 306, and the motor 401 drives the input bevel gear 306 to rotate via the output bevel gear 402. A contact switch A501 is mounted on the control assembly, and a contact switch B502 is mounted on the base 107. When the control assembly closes the communication channel, contact switch A501 and contact switch B502... When contact 02 is energized and sends a signal to the control unit of motor 401, and valve head 104 closes the communication channel, contact switch A501 and contact switch B502 are energized and send a signal to motor 401. Motor 401 starts and controls turntable 305 to rotate continuously through the meshing connection of output bevel gear 402 and input bevel gear 306, causing rocker arm 307 to swing continuously, controlling plunger 303 and plug head 304 to move in air chamber 301. Air cover 201 serves as a gas transmission channel between air chamber 301 and air bag 203, causing air bag 203 to continuously expand and contract, thereby causing fluctuations in low-temperature fluid medium and residual water vapor.

[0033] Please see Figures 2-3 and Figures 6-8In this embodiment, a second signal module is installed on the linkage component, and a heat generator 701 is installed on the base 107. The second signal module is used to detect the movement state of the linkage component and send a signal to the control unit of the heat generator 701. The heat generator 701 is used to heat the gas in the first gas charging / discharging component. When the linkage component moves to the preset position H1, the heat generator 701 is activated; when the linkage component moves to the preset position H2, the heat generator 701 is deactivated. The second signal module includes a tension spring 601 and a tension sensor 602 installed on the plug 304. The tension sensor 602 is used to detect the tension value of the tension spring 601. When the plug 304 moves to the preset position H1, the tension sensor 602 detects the tension value of the tension spring 601 as F1; when the plug 304 moves to the preset position H2, the tension sensor 602 detects... When the tension of the spring 601 is measured to be F2, and the plug 304 moves up to position H1 (the top of the air chamber 301), the tension sensor 602 detects that the tension of the spring 601 has reached F1 and sends a signal to the heat generator 701 (a device such as a heating resistance wire can be used). The heat generator 701 heats the gas in the air cover 201. Then the plug 304 continues to move down, allowing the gas in the air chamber 301 to flow into the air bag 203 through the air cover 201. During this process, the gas is heated. When the plug 304 moves down to position H2 (the bottom of the air chamber 301), the tension sensor 602 detects that the tension of the spring 601 has reached F2 and sends a signal to the heat generator 701. The heat generator 701 shuts down and stops heating. Then the plug 304 continues to move up, drawing the gas in the air bag 203 into the air chamber 301 through the air cover 201.

[0034] Working principle: The user turns the handwheel 106 by hand, which drives the valve head 104 to move downward through the valve stem 105, closing the communication channel. At this time, the cryogenic fluid medium cannot enter the outlet 103 from the inlet end 102. At the same time, the moving platform 108 moves together with the valve stem 105 and, together with the base 107, creates a pressure effect on the gas cover 201, causing the gas in the gas cover 201 to flow into the air bag 203 through the gas delivery pipe 202. The air bag 203 expands and pushes out the cryogenic fluid medium remaining in the valve chamber 101.

[0035] When the moving platform 108 moves until contact switch A501 contacts contact switch B502, it is energized and sends a signal to motor 401. Motor 401 starts and outputs power to output bevel gear 402. Through the meshing connection between output bevel gear 402 and input bevel gear 306, it controls turntable 305 to rotate continuously (the rotation speed is adjusted according to the output power of motor 401 as needed). During the rotation of turntable 305, rocker arm 307 swings continuously and controls plunger 303 and plug head 304 to move in air chamber 301 (when plug head 304 moves upward, gas flows from air cover 201 into air chamber 301; when plug head 304 moves downward, gas flows from air chamber 301 into air cover 201). Air cover 201 acts as a gas transmission channel between air chamber 301 and air bag 203, causing air bag 203 to continuously expand and contract, thereby causing fluctuations in the low-temperature fluid medium and residual water vapor.

[0036] When the plug 304 moves up to position H1, the tension sensor 602 detects that the tension value of the tension spring 601 reaches F1 and sends a signal to the heat generator 701. The heat generator 701 heats the gas in the air cover 201. The plug 304 moves down, allowing the gas in the air chamber 301 to flow into the air bag 203 through the air cover 201. During this process, the gas is heated. When the plug 304 moves down to position H2, the tension sensor 602 detects that the tension value of the tension spring 601 reaches F2 and sends a signal to the heat generator 701. The heat generator 701 shuts down and stops heating. The plug 304 then moves up, drawing the gas in the air bag 203 into the air chamber 301 through the air cover 201.

Claims

1. A cryogenic shut-off valve, comprising a valve chamber (101), an inlet end (102) disposed at one end of the valve chamber (101), and an outlet end (103) disposed at the other end of the valve chamber (101), wherein a communication channel is provided between the inlet end (102) and the outlet end (103); characterized in that: It also includes a base (107) mounted on the valve chamber (101), a control component movably connected to the valve chamber (101), a first inflation / deflation component mounted on the control component, and an airbag (203) mounted in the valve chamber (101). The first inflation / deflation component is connected to the airbag (203), and the control component is used to open or close the communication channel. When the control component opens the communication channel, the gas in the airbag (203) flows into the first inflation / deflation component; when the control component opens the communication channel, the gas in the first inflation / deflation component flows into the airbag (203). The control unit is equipped with a second inflation / deflation component and a drive component. The input end of the second inflation / deflation component is connected to the output end of the drive component. The second inflation / deflation component is connected to the first inflation / deflation component. The drive component is used to control the flow of gas between the first inflation / deflation component and the second inflation / deflation component.

2. The cryogenic shut-off valve according to claim 1, characterized in that: The control components include a valve stem (105) movably connected to the valve chamber (101), a valve head (104) fixedly connected to one end of the valve stem (105), a handwheel (106) fixedly connected to the other end of the valve stem (105), and a movable stage (108) fixedly connected to the valve stem (105). The handwheel (106) controls the valve head (104) to move closer to or further away from the communication channel via the valve stem (105). When the valve head (104) is close to the communication channel, the moving stage (108) is close to the base (107); when the valve head (104) is far away from the communication channel, the moving stage (108) is far away from the base (107).

3. A cryogenic shut-off valve according to claim 2; characterized in that: The first inflation / deflation assembly includes an air hood (201) mounted on a mobile platform (108) and an air supply pipe (202) connected at one end to the air hood (201). The other end of the air hood (201) is connected to a base (107), and the other end of the air supply pipe (202) is connected to an air bladder (203). Gas flows between the air hood (201) and the air bladder (203) through the air supply pipe (202). When the moving stage (108) approaches the base (107), the gas in the air hood (201) flows into the airbag (203); when the moving stage (108) moves away from the base (107), the gas in the airbag (203) flows into the air hood (201).

4. A cryogenic shut-off valve according to claim 3, characterized in that: The second inflation / deflation assembly includes an air chamber (301) mounted on a moving platform (108), a bracket (302) fixedly connected to the air chamber (301), a linkage assembly movably connected to the air chamber (301), and a transmission assembly movably connected to the bracket (302). The input end of the linkage assembly is connected to the output end of the transmission assembly, and the input end of the transmission assembly is connected to the output end of the drive assembly. The drive assembly is used to drive the transmission assembly to rotate, and the transmission assembly is used to drive the linkage assembly to move within the air chamber (301).

5. A cryogenic shut-off valve according to claim 4, characterized in that: The linkage assembly includes a plunger (303) movably connected to the air chamber (301), a plug (304) fixedly connected to one end of the plunger (303), and a rocker arm (307) movably connected to the other end of the plunger (303). The plug (304) is disposed in the air chamber (301), and the rocker arm (307) is movably connected to the output end of the transmission assembly. The transmission assembly is used to drive the rocker arm (307) to swing. The rocker arm (307) drives the plug (304) to move in the air chamber (301) through the plunger (303). When the plug (304) moves downward, the gas in the gas chamber (301) flows into the gas cover (201); when the plug (304) moves upward, the gas in the gas cover (201) flows into the gas chamber (301).

6. A cryogenic shut-off valve according to claim 5, characterized in that: The transmission assembly includes a turntable (305) movably connected to the bracket (302) and an input bevel gear (306) fixedly mounted on the turntable (305). The rocker arm (307) is movably connected to the eccentric position of the turntable (305). The input bevel gear (306) is connected to the output end of the drive assembly. The drive assembly drives the turntable (305) to rotate through the input bevel gear (306), and the turntable (305) drives the rocker arm (307) to swing.

7. A cryogenic shut-off valve according to claim 6, characterized in that: The drive assembly includes a motor (401) mounted on a moving platform (108) and an output bevel gear (402) mounted on the output end of the motor (401). The output bevel gear (402) meshes with an input bevel gear (306), and the motor (401) drives the input bevel gear (306) to rotate through the output bevel gear (402).

8. A cryogenic shut-off valve according to claim 7, characterized in that: A contact switch A (501) is installed on the control component, and a contact switch B (502) is installed on the base (107). When the control component closes the communication channel, contact switch A (501) and contact switch B (502) are energized and send a signal to the control unit of the motor (401).

9. A cryogenic shut-off valve according to claim 8, characterized in that: A second signal module is installed on the linkage component, and a heat generator (701) is installed on the base (107). The second signal module is used to detect the movement status of the linkage component and send a signal to the control unit of the heat generator (701). The heat generator (701) is used to heat the gas in the first gas charging and discharging component. When the linkage component moves to the preset position H1, the heat generator (701) is activated; when the linkage component moves to the preset position H2, the heat generator (701) is deactivated.

10. A cryogenic shut-off valve according to claim 9, characterized in that: The second signal module includes a tension spring (601) and a tension sensor (602) mounted on the plug (304). The tension sensor (602) is used to detect the tension value of the tension spring (601). When the plug (304) moves to the preset position H1, the tension sensor (602) detects the tension value of the tension spring (601) as F1; when the plug (304) moves to the preset position H2, the tension sensor (602) detects the tension value of the tension spring (601) as F2.

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