Adjustable vacuum interface valve fixing device for liquid nitrogen container

Abstract

The utility model discloses an adjustable vacuum interface valve fixing device for a liquid nitrogen container, belongs to the technical field of mechanical structures, and solves the technical problems that a vacuumizing fixing device for the liquid nitrogen container is high in cost and tedious in vacuumizing process. The fixing device comprises a left fixing ring, a right fixing ring, a fixing ring fixing screw, a connecting plate, a vacuum valve fixing plate and a vacuum interface valve fixing screw. The left fixing ring and the right fixing ring are connected and fixed through the fixing ring fixing screws, and the left fixing ring and the right fixing ring are embedded in the circumferential face of the liquid nitrogen container shell. The vacuum valve fixing plate, the connecting plate and the right fixing ring are sequentially and fixedly connected, and the vacuum connector valve and the vacuum valve fixing plate are fixedly connected through the vacuum connector valve fixing screw. The fixing device is used for fixing the vacuum interface valve when the liquid nitrogen container is vacuumized and maintained.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical structures, and in particular relates to an adjustable vacuum interface valve fixing device for a liquid nitrogen container. Background Art

[0002] Liquid nitrogen is a special industrial product. Due to its standard boiling point of -196℃, colorless, odorless, non-toxic and stable chemical properties, it is a commonly used ultra-low temperature refrigerant in low temperature refrigeration technology. Liquid nitrogen is generally stored and transported in liquid nitrogen containers. Liquid nitrogen containers such as Figure 1 As shown, it includes a liquid nitrogen container shell 1, a liquid nitrogen container bottleneck 2, and a vacuum extraction port connector 3. The liquid nitrogen container can store liquid nitrogen, which is based on the principle of reducing liquid nitrogen loss by utilizing the thermal insulation performance of its vacuum interlayer and insulation layer. During long-term use or repeated transportation, the liquid nitrogen container often experiences a failure of the vacuum degree of the interlayer space decreasing, and its thermal insulation performance deteriorates, which will accelerate the volatilization loss of liquid nitrogen, causing the liquid nitrogen container to not have the performance of storing liquid nitrogen for a long time. Therefore, it is necessary to utilize a special vacuum interface valve to vacuumize and maintain it through the vacuum extraction port connector of the liquid nitrogen container. However, due to differences in manufacturers and usage requirements, the volume and structure of the liquid nitrogen container are different, resulting in different structural parameters such as the diameter of the liquid nitrogen container shell, the position of the vacuum extraction port connector on the bottleneck of the liquid nitrogen container, and the curvature of the bottleneck. If different liquid nitrogen containers are equipped with corresponding vacuum fixtures, this will greatly increase the cost of processing the fixtures and the cumbersomeness of the vacuum extraction process. Currently, there is no relevant literature report on a fixture with an adjustable vacuum interface valve for vacuum maintenance of liquid nitrogen containers. Utility Model Content

[0003] In order to overcome the shortcomings of high cost and complicated vacuuming process of a liquid nitrogen container vacuum fixing device, the utility model proposes an adjustable vacuum interface valve fixing device for a liquid nitrogen container.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A fixing device for an adjustable vacuum interface valve of a liquid nitrogen container, comprising a left fixing ring, a right fixing ring, fixing ring fixing screws, an adjustment slot, a fixing backing plate, an adjustment slot fixing screws, a fixing slot, a connecting plate, a vacuum valve fixing plate, a fixing plate connecting screws, an angle adjustment screw, an arc-shaped adjustment hole, a center hole, a vacuum valve fixing screw, a long strip adjustment hole, and a vacuum interface valve;

[0006] Furthermore, the left fixing ring and the right fixing ring are nested in the circumferential surface of the liquid nitrogen container shell by fixing ring fixing screws; and the left fixing ring is composed of two 1 / 4 arc rings, of which one 1 / 4 arc ring and the adjustment slot are an integral structure, and the other 1 / 4 arc ring can pass through the adjustment slot, and the fixing plate built into the adjustment slot is squeezed by the adjusting slot fixing screw to realize the connection and fixation of the two 1 / 4 arc rings, and the radius of the left fixing ring can be changed by adjusting the length of the two 1 / 4 arc rings overlapping each other, thereby realizing the nested connection of the left and right fixing rings with the circumferential surfaces of the liquid nitrogen container shells of different diameters.

[0007] Furthermore, the connecting plate can be movably inserted into the fixed slot, the vacuum valve fixing plate is connected to the connecting plate by the fixing plate connecting screws, the arc-shaped adjustment holes are symmetrically arranged on both sides of the vacuum valve fixing plate, and the angle adjustment screws slide in the arc-shaped adjustment holes to achieve the tangency of the vacuum valve fixing plate with curved surfaces of different curvatures at the bottlenecks of different liquid nitrogen containers.

[0008] Furthermore, a central hole is provided at the center of the vacuum valve fixing plate. The structure of the central hole consists of a rectangular hole in the middle and two symmetrical semicircular holes on the left and right, and the width (or radius) of the hole is greater than the diameter of the vacuum port joint and the vacuum interface valve. The structural layout of the central hole can meet the requirements of vacuum port joints at different positions of the bottlenecks of different liquid nitrogen containers being built into the central hole, and at the same time, the vacuum interface valve can also be completely nested outside the vacuum port joint of the liquid nitrogen container. Long adjustment holes are symmetrically provided on the left and right sides of the central hole to adjust the position of the vacuum valve fixing screws in the long adjustment holes, and the vacuum interface valve is fixed and sealed to the vacuum valve fixing plate and the vacuum port joint respectively through the vacuum interface valve fixing screws.

[0009] Furthermore, the vacuum interface valve is conveniently connected to the vacuum maintenance system through the KF25 interface to achieve vacuum maintenance of the liquid nitrogen container.

[0010] The beneficial effects of the utility model are:

[0011] A device for fixing an adjustable vacuum interface valve for a liquid nitrogen container. The left fixing ring is composed of two 1 / 4 arc rings. The two 1 / 4 arc pieces are fixedly connected by adjusting the slot fixing screws to squeeze the fixing pad. The radius is adjustable, realizing a nested connection with the circumferential surface of the liquid nitrogen container shell of different diameters.

[0012] A device for fixing an adjustable vacuum interface valve for a liquid nitrogen container. The device achieves tangency between a vacuum valve fixing plate and curved surfaces of different curvatures at the bottlenecks of different liquid nitrogen containers through the structural design of an angle adjustment screw and an arc-shaped adjustment hole. Furthermore, the structural layout of the central hole of the vacuum valve fixing plate enables complete nesting of the vacuum interface valve with vacuum extraction port joints at different positions on the bottlenecks of different liquid nitrogen containers.

[0013] A fixing device for an adjustable vacuum interface valve of a liquid nitrogen container adopts a structural design of long adjustment holes in a vacuum valve fixing plate to achieve the fixation and sealing of the vacuum interface valve, the vacuum valve fixing plate, and the vacuum extraction port joint.

[0014] The invention discloses an adjustable vacuum interface valve fixing device for a liquid nitrogen container, which can maintain the vacuum without leaking the vacuum. The device has few components, a simple structure, is easy to install, and is convenient to maintain and carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a liquid nitrogen container;

[0016] Figure 2 This is a schematic structural diagram of a vacuum interface valve fixing device including a vacuum interface valve portion according to an embodiment of the present utility model;

[0017] Figure 3 This is a schematic structural diagram of a vacuum interface valve fixing device according to an embodiment of the present utility model;

[0018] Figure 4 This is an assembly drawing of a vacuum interface valve fixing device according to an embodiment of the present utility model.

[0019] Figure markings: 1. Liquid nitrogen container shell, 2. Liquid nitrogen container bottleneck, 3. Vacuum extraction port joint, 11. Left fixing ring, 12. Right fixing ring, 13. Fixing ring fixing screw, 14. Adjustment slot, 15. Fixing pad, 16. Adjustment slot fixing screw, 17. Fixing slot, 18. Connecting plate, 19. Vacuum valve fixing plate, 20. Fixing plate connecting screw, 21. Angle adjustment screw, 22. Arc-shaped adjustment hole, 23. Center hole, 24. Vacuum interface valve fixing screw, 25. Long strip adjustment hole, 26. Vacuum interface valve. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] A vacuum interface valve fixing device for a liquid nitrogen container with adjustable Figure 2 、 Figure 3 As shown, it includes a left fixing ring 11, a right fixing ring 12, a fixing ring fixing screw 13, an adjustment slot 14, a fixing pad 15, an adjustment slot fixing screw 16, a fixing slot 17, a connecting plate 18, a vacuum valve fixing plate 19, a fixing plate connecting screw 20, an angle adjustment screw 21, an arc adjustment hole 22, a center hole 23, a vacuum interface valve fixing screw 24, a long adjustment hole 25, and a vacuum interface valve 26.

[0023] The left fixing ring 11 and the right fixing ring 12 are nested in the circumferential surface of the liquid nitrogen container shell 1 by fixing ring fixing screws 13; the left fixing ring 11 is composed of two 1 / 4 arc rings, of which one 1 / 4 arc ring and the adjustment slot 14 are an integral structure, and the other 1 / 4 arc ring can pass through the adjustment slot 14, and the fixing plate 15 built into the adjustment slot 14 is squeezed by the adjustment slot fixing screw 16 to achieve the connection and fixation of the two 1 / 4 arc rings, and the radius of the left fixing ring 11 can be changed by adjusting the length of the two 1 / 4 arc rings overlapping each other, thereby achieving the nested connection between the left fixing ring 11 and the right fixing ring 12 and the circumferential surface of the liquid nitrogen container shell 1 of different diameters.

[0024] The connecting plate 18 can be movably inserted into the fixed slot 17, and the vacuum valve fixing plate 19 is connected to the connecting plate 18 by the fixing plate connecting screws 20. The arc-shaped adjustment holes 22 are symmetrically arranged on both sides of the vacuum valve fixing plate 19. The angle adjustment screws 21 slide in the arc-shaped adjustment holes 22 to achieve the tangency of the vacuum valve fixing plate 19 with the curved surfaces of different curvatures at the bottlenecks 2 of different liquid nitrogen containers.

[0025] The central hole 23 is set at the center of the vacuum valve fixing plate 19. The structure of the central hole 23 consists of a rectangular hole in the middle and two symmetrical semicircular holes on the left and right. The width (or radius) of the hole is greater than the diameter of the vacuum port connector 3 and the vacuum interface valve 26. The structural layout of the central hole 23 can meet the requirements of the vacuum port connector 3 at different positions of the bottleneck 2 of different liquid nitrogen containers to be built into the central hole 23, and at the same time, the vacuum interface valve 26 can also be completely nested outside the vacuum port connector 3 of the liquid nitrogen container. Long strip adjustment holes 25 are symmetrically provided on the left and right sides of the central hole 23 to adjust the position of the vacuum interface valve fixing screw 24 in the long strip adjustment hole 25. The vacuum interface valve fixing screw 24 is used to fix and seal the vacuum interface valve 26 to the vacuum valve fixing plate 19 and the vacuum port connector 3 respectively.

[0026] The right fixing ring 12 is provided with a fixing slot 17, which is located at 1 / 2 of the right fixing ring 12 along the circumferential direction; the connecting plate 18 is located in the fixing slot 17, and the shape of the connecting plate 18 matches the slot of the fixing slot 17; the upper end of the vacuum valve fixing plate 19 and the connecting plate 18 are connected by the fixing plate connecting screw 20 and the angle adjustment screw 21; the vacuum valve fixing plate 19 is symmetrically provided with two arc-shaped adjustment holes 22, and the angle adjustment screw 21 is located in the arc-shaped adjustment hole 22. The angle adjustment screw 21 is used to adjust the angle between the vacuum valve fixing plate 19 and the connecting plate 18.

[0027] A central hole 23 is provided at the center of the vacuum valve fixing plate 19 , and the structural shape of the central hole 23 matches the outer diameter of the vacuum extraction port connector 3 and the outer diameter of the vacuum interface valve 26 .

[0028] The vacuum interface valve 26 is conveniently connected to the vacuum maintenance system through the KF25 interface to achieve vacuum maintenance of the liquid nitrogen container 1.

[0029] Example 2

[0030] The working process of an adjustable vacuum interface valve fixing device for a liquid nitrogen container is:

[0031] 1. Insert the fixing plate 15 of the left fixing ring 11 into the adjusting slot 14, and squeeze the fixing plate 15 by adjusting the slot fixing screws 16 to adjust the two 1 / 4 arc rings to a certain diameter and fix them.

[0032] 2. The left fixing ring 11 and the right fixing ring 12 are nested and fixed on the circumferential surface of the liquid nitrogen container shell 1 through the fixing ring fixing screws 13.

[0033] 3. The connecting plate 18 is inserted into the fixing slot 17, and the angle adjustment screw 21 is used to make the vacuum valve fixing plate 19 tangent to the bottleneck 2 of the liquid nitrogen container, while the vacuum port connector 3 of the liquid nitrogen container is built into the central hole 23.

[0034] 4. Completely nest the vacuum interface valve 26 in the vacuum outlet joint 3 of the liquid nitrogen container, adjust the position of the vacuum interface valve fixing screw 24 in the long adjustment hole 25, and fix and seal the vacuum interface valve 26 to the vacuum valve fixing plate 19 and the vacuum outlet joint 3 respectively through the vacuum interface valve fixing screw 24.

[0035] 5. The vacuum interface valve 26 is connected to the vacuum maintenance system through the KF25 interface to perform vacuum maintenance on the liquid nitrogen container. Figure 4 shown.

Claims

1. A device for fixing an adjustable vacuum interface valve of a liquid nitrogen container, characterized in that: It comprises a left fixing ring (11), a right fixing ring (12), fixing ring fixing screws (13), a connecting plate (18), a vacuum valve fixing plate (19), and a vacuum interface valve fixing screw (24); The left fixing ring (11) and the right fixing ring (12) are connected and fixed by fixing ring fixing screws (13), and the left fixing ring (11) and the right fixing ring (12) are nested in the circumferential surface of the liquid nitrogen container shell (1); The vacuum valve fixing plate (19), the connecting plate (18) and the right fixing ring (12) are connected and fixed in sequence, and the vacuum interface valve (26) and the vacuum valve fixing plate (19) are connected and fixed via the vacuum interface valve fixing screws (24).

2. The vacuum interface valve fixing device according to claim 1, characterized in that: The left fixing ring (11) comprises two 1 / 4 arc rings, wherein one 1 / 4 arc ring is provided with an adjustment slot (14), and the other 1 / 4 arc ring is provided with a fixing pad (15), the fixing pad (15) passes through the adjustment slot (14), and the two 1 / 4 arc rings are connected and fixed by adjusting slot fixing screws (16).

3. The vacuum interface valve fixing device according to claim 1, characterized in that: The right fixing ring (12) is provided with a fixing slot (17), which is located at 1 / 2 of the right fixing ring (12) along the circumferential direction; the connecting plate (18) is located in the fixing slot (17), and the outer shape of the connecting plate (18) matches the slot of the fixing slot (17); the upper end of the vacuum valve fixing plate (19) and the connecting plate (18) are connected through a fixing plate connecting screw (20) and an angle adjustment screw (21); the vacuum valve fixing plate (19) is symmetrically provided with two arc-shaped adjustment holes (22), the angle adjustment screw (21) is located in the arc-shaped adjustment hole (22), and the angle adjustment screw (21) is used to adjust the angle between the vacuum valve fixing plate (19) and the connecting plate (18).

4. The vacuum interface valve fixing device according to claim 1, characterized in that: A central hole (23) is provided at the center of the vacuum valve fixing plate (19), and the structural shape of the central hole (23) matches the outer diameter of the vacuum extraction port connector (3) and the outer diameter of the vacuum interface valve (26).

5. The vacuum interface valve fixing device according to claim 1, characterized in that: The vacuum valve fixing plate (19) is symmetrically provided with two long strip adjustment holes (25), the vacuum interface valve fixing screws (24) are located in the long strip adjustment holes (25), and the long strip adjustment holes (25) are used to connect and fix the vacuum interface valve (26).

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