Auxiliary devices and installation methods for cold shield liquid nitrogen coils

Abstract

This invention relates to an auxiliary device and method for installing liquid nitrogen coils with a cold shield, belonging to the field of liquid nitrogen coils. It includes an inner tank, with an outer tank surrounding the inner tank. A spring-shaped coil, a pusher, and a drive mechanism are positioned between the inner and outer tanks. The spring-shaped coil is fitted around the outer circumference of the inner tank. The drive mechanism is located below the spring-shaped coil, and the pusher is located on one side of the spring-shaped coil, slidably connected to the inner wall of the outer tank. The pusher includes a transfer box, one end of which is slidably connected to the inner wall of the outer tank via a slider, and the other end of which is connected to a screw via a clamping assembly. A connecting pipe is rotatably mounted on one side of the transfer box, communicating with the transfer box and the coil via a liquid inlet pipe. A connecting pipe is located on the other side of the transfer box, with a sealing cap at the end of the connecting pipe furthest from the transfer box. This invention improves the versatility of liquid nitrogen coils and reduces production costs.

Description

Technical Field

[0001] This invention relates to an auxiliary device and installation method for installing liquid nitrogen coils with cold shields, belonging to the field of liquid nitrogen coils. Background Technology

[0002] Large liquid helium storage tanks are crucial equipment for realizing helium extraction project results and connecting helium end-users. Because the operating temperature of liquid helium storage tanks is close to absolute zero, there is currently no research in China on the technology, control, structure, materials, and insulation of large containers at this temperature. Experience with instrumentation and valves in this temperature range is lacking, the experimental conditions are challenging, and the conditions exceed the applicability range of some related software. Therefore, it is necessary to conduct research and development on the design and manufacturing technologies of liquid helium storage tanks, building upon existing technological foundations.

[0003] Liquid helium storage tanks are jacketed devices with three layers: inner, middle, and outer. The cold shield is located in the middle layer. The inner cylinder contains liquid helium, which is highly volatile and has a liquefaction temperature of -269°C, close to absolute zero. At the same temperature, its volatility is 13 times that of liquid hydrogen. Currently, the commonly used cold shield is a liquid nitrogen coil. Liquid nitrogen is circulated inside the liquid nitrogen coil to ensure that the temperature of the cold shield is always kept at -196°C, thereby reducing the evaporation rate of liquid helium (-269°C).

[0004] Currently, during the installation of liquid nitrogen coils, due to the different lengths of liquid helium storage tanks, it is necessary to produce liquid nitrogen coils of corresponding lengths, resulting in poor versatility of liquid nitrogen coils. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an auxiliary device and method for installing liquid nitrogen coils with cold shields, thereby improving the versatility of liquid nitrogen coils and reducing production costs.

[0006] The present invention provides an auxiliary device for installing liquid nitrogen coils in a cold shield, comprising an inner tank, an outer tank disposed around the outer periphery of the inner tank, a spring-shaped coil, a pusher, and a drive mechanism disposed between the inner tank and the outer tank, the coil being fitted around the outer periphery of the inner tank, the drive mechanism being located below the coil, the pusher being located on one side of the coil, and the pusher being slidably connected to the inner wall of the outer tank.

[0007] The propulsion unit includes a transfer box. One end of the transfer box is slidably connected to the inner wall of the outer tank via a slider, and the other end of the transfer box is connected to a screw via a clamping assembly. A connecting pipe is rotatably installed on one side of the transfer box, and the connecting pipe is connected to the transfer box. The connecting pipe is connected to the coil via a liquid inlet pipe. A connecting pipe is installed on the other side of the transfer box, and a sealing cap is installed on the end of the connecting pipe away from the transfer box.

[0008] The inner wall of the outer tank is provided with a groove corresponding to the slider. The groove makes the slider slide more smoothly on the inner wall of the outer tank.

[0009] The clamping assembly includes two symmetrically arranged arc-shaped clamping plates, with a fixing block at the bottom of each arc-shaped clamping plate connected by screws. The two arc-shaped clamping plates grip the screw, causing the transfer box to move along the screw.

[0010] The arc-shaped clamping plate and the screw are connected by threads. This threaded connection ensures a tighter connection between the arc-shaped clamping plate and the screw.

[0011] A liquid injection pipe is installed through one end of the inner tank, and a valve is mounted on the liquid injection pipe. Liquid helium is injected into the inner tank through the liquid injection pipe, and the valve is closed after the injection is completed.

[0012] The outer tank port is equipped with a removable sealing cap. The sealing cap seals the outer tank.

[0013] The outer tank is provided with a bottom plate at its lower part, and the outer tank is fixed to the bottom plate by a support plate. The support plate and the bottom plate provide support for the outer tank.

[0014] The driving mechanism includes a screw arranged axially along the inner tank body, a limiting block at the tail end of the screw, the screw and the limiting block being rotatably connected, a turntable at the head end of the screw, and the middle of the screw connected to the outer tank body via a connecting rod. Short rods are provided between adjacent screws on the same side. Rotating the screw causes the arc-shaped clamping plate to move, and the position of the pusher moves along the screw with the arc-shaped clamping plate, pushing the coil into the outer tank body. The short rods on the screw are used to connect the screw, allowing the screw length to be adjusted arbitrarily to accommodate tanks of varying lengths.

[0015] The installation method of the liquid nitrogen coil installation auxiliary device includes the following steps:

[0016] S1. Install the thruster;

[0017] The installation steps include:

[0018] S11. Install a screw on the inner tank body, and fit a coil around the outer periphery of the inner tank body. The screw is located between the inner tank body and the coil.

[0019] S12. Two thrusters are installed on the upper and lower sides of the inner tank. The connecting pipe on the thruster is connected to the liquid inlet pipe. Liquid nitrogen is injected into the connecting pipe. The two arc-shaped clamps are closed, and the thruster installation is completed.

[0020] S2. Correct the installation position of the coil;

[0021] The corrective steps include:

[0022] S21. Rotate the screw, the arc-shaped clamp moves, and the position of the pusher moves on the screw along with the arc-shaped clamp. The pusher pushes the coil to move into the outer tank, and the installation position of the coil is corrected.

[0023] In step S21, a short rod is installed on the screw, and the arc-shaped clamp moves to the short rod and engages with it. The transfer box is pushed by the long rod, so that the arc-shaped clamp contacts the next section of the screw. The screw continues to rotate, and the arc-shaped clamp continues to move on the screw.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) This invention employs an assembled spring-shaped coil. Because the coil is spring-shaped, it can be compressed under the combined action of the pusher and the drive mechanism, thereby adjusting the coil length. Therefore, a suitable number of coils can be selected and combined according to the length of the tank, improving the versatility of the liquid nitrogen coil and reducing production costs. At the same time, because the coil can be compressed, more coils can be fitted onto the tank, allowing more liquid nitrogen to be injected into the tank and reducing the evaporation rate of liquid helium.

[0026] (2) The driving mechanism includes a screw arranged axially along the inner tank body, a limiting block at the tail end of the screw, the screw and the limiting block being rotatably connected, a turntable at the head end of the screw, and the middle part of the screw being connected to the outer tank body via a connecting rod. Short rods are provided between adjacent screws on the same side. When the screw is rotated, the arc-shaped clamping plate moves, and the position of the pusher moves along the arc-shaped clamping plate on the screw, pushing the coil to move into the outer tank body. Short rods are provided on the screw, which are used to connect the screw. When the tank length varies, the length of the screw can be adjusted arbitrarily to adapt to tanks of different lengths.

[0027] (3) In step S21, a short rod is installed on the screw, and the arc-shaped clamp moves to the short rod, where it engages with the short rod. The transfer box is pushed by the long rod, causing the arc-shaped clamp to contact the next section of the screw. The screw continues to rotate, and the arc-shaped clamp continues to move on the screw. The transfer box is pushed by the long rod, allowing the arc-shaped clamp to continue moving on the screw, ensuring the tightness of the coil installation. Attached Figure Description

[0028] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0029] Figure 2 for Figure 1 Enlarged schematic diagram of part B;

[0030] Figure 3 This is a schematic diagram of the clamping assembly.

[0031] Figure 4 for Figure 1 Enlarged schematic diagram of part A;

[0032] Figure 5 for Figure 1 Enlarged schematic diagram of part C.

[0033] In the diagram: 1. Base plate; 2. Support plate; 3. Coil; 4. Outer tank; 5. Screw; 6. Inner tank; 7. Valve; 8. Injection pipe; 9. Sealing cap; 10. Limiting block; 11. First bearing; 12. Sliding block; 13. First connecting block; 14. Sealing cap; 15. Connecting pipe; 16. Transfer box; 17. Second connecting block; 18. Arc-shaped clamp; 19. Fixing block; 20. Screw; 21. Short rod; 22. Turntable; 23. Hinge; 25. Inlet pipe; 26. Connecting pipe; 27. Second bearing; 28. Connecting rod. Detailed Implementation

[0034] The present invention will be further described below with reference to embodiments:

[0035] Example 1

[0036] like Figure 1-3 As shown, it includes an inner tank 6, an outer tank 4 is arranged around the outer periphery of the inner tank 6, and a spring-shaped coil 3, a pusher and a drive mechanism are arranged between the inner tank 6 and the outer tank 4. The coil 3 is fitted around the outer periphery of the inner tank 6, the drive mechanism is located below the coil 3, the pusher is located on one side of the coil 3, and the pusher is slidably connected to the inner wall of the outer tank 4. The pusher is used to compress the coil 3, and the drive mechanism is used to drive the pusher to move. There can be two drive mechanisms, which are located on the upper and lower sides of the inner tank 6 respectively.

[0037] The propulsion unit includes a transfer box 16, one end of which is slidably connected to the inner wall of the outer tank 4 via a slider 12. A groove is provided on the inner wall of the outer tank 4 corresponding to the slider 12. A first connecting block 13 is provided between the transfer box 16 and the slider 12 to connect them. The other end of the transfer box 16 is connected to a screw 5 via a clamping assembly. A second connecting block 17 is provided between the transfer box 16 and the clamping assembly to connect them. The clamping assembly includes symmetrical... Two arc-shaped clamps 18 are provided, and the arc-shaped clamps 18 are connected to the screw 5 by threads; the top of the arc-shaped clamps 18 is connected to the second connecting block 17 by hinge 23, and the bottom of the arc-shaped clamps 18 is provided with a fixing block 19, which is connected by screw 20; a connecting pipe 26 is rotatably provided on one side of the transfer box 16, and the connecting pipe 26 is connected to the transfer box 16. The connecting pipe 26 is connected to the coil 3 through the liquid inlet pipe 25. A connecting pipe 15 is provided on the other side of the transfer box 16, and a sealing cap 14 is provided at the end of the connecting pipe 15 away from the transfer box.

[0038] An injection pipe 8 is provided through one end of the inner tank 6, and a valve 7 is installed on the injection pipe 8; a sealing cap 9 is provided at the port of the outer tank 4, and the sealing cap 9 is removable; a bottom plate 1 is provided at the bottom of the outer tank 4, and the outer tank 4 is fixed to the bottom plate 1 through a support plate 2.

[0039] like Figure 4-5As shown, the driving mechanism includes a screw 5 arranged axially along the inner tank 6. A limiting block 10 is provided at the tail end of the screw 5. The limiting block 10 is fixedly connected to the outer wall of the inner tank 6. The screw 5 is rotatably connected to the limiting block 10. A first bearing 11 is provided on the side of the limiting block 10 near the screw 5. The outer ring of the first bearing 11 is fixedly connected to the limiting block 10. The inner ring of the first bearing 11 is sleeved on the tail end of the screw 5. A turntable 22 is provided at the head end of the screw 5. The middle part of the screw 5 is connected to the outer tank 4 through a connecting rod 28. The connecting rod 28 is provided near the turntable 22 and is located between the turntable 22 and the coil 3. A second bearing 27 is provided at the lower part of the connecting rod 28. The inner ring of the second bearing 27 is sleeved on the screw 5. The outer ring of the second bearing 27 is fixedly connected to one end of the connecting rod 28. Each driving mechanism includes multiple screws 5. Short rods 21 are provided between adjacent screws 5 on the same side.

[0040] A method for installing an auxiliary device for cold shield liquid nitrogen coils includes the following steps:

[0041] S1. Install the thruster;

[0042] The installation steps include:

[0043] S11. Install screw 5 on inner tank 6, and sleeve coil 3 around the outer periphery of inner tank 6. Screw 5 is located between inner tank 6 and coil 3.

[0044] S12. Two thrusters are installed on the upper and lower sides of the inner tank 6. The connecting pipe 26 on the thruster is connected to the liquid inlet pipe 25. The slider 12 is connected to the sliding groove on the inner wall of the outer tank 4. Liquid nitrogen is injected into the connecting pipe 15. The liquid nitrogen enters the coil 3 through the transfer box 16, the connecting pipe 26, and the liquid inlet pipe 25. After the injection is completed, the connecting pipe 15 is sealed with the sealing cap 14. The two arc-shaped clamps 18 are closed to clamp the screw 5. Then the two fixing blocks 19 are connected with the screw 20. The thruster installation is completed.

[0045] S2. Correct the installation position of the coil;

[0046] The corrective steps include:

[0047] S21. Rotate screw 5, the arc-shaped clamp 18 moves, the position of the pusher moves on screw 5 along with the arc-shaped clamp 18, the pusher pushes the coil 3 to move into the outer tank 4, and the installation position of coil 3 is corrected. In step S21, a short rod 21 is installed on the screw 5. The arc-shaped clamp 18 moves to the short rod 21 and engages with the short rod 21. The transfer box 16 is pushed by the long rod (not shown in the figure) so that the arc-shaped clamp 18 contacts the next section of the screw 5. The screw 5 continues to rotate, and the arc-shaped clamp 18 continues to move on the screw 5 until the coil 3 is pressed against the limit block 10 and compressed by the transfer box 16. The above steps are repeated to install more coils 3 on the inner tank 6. After installation, the second bearing 27, connecting rod 28 and turntable 22 are installed in sequence. Then, liquid helium is injected into the inner tank 6 through the injection pipe 8. After injection, the valve 7 is closed, and then the sealing cap 9 is connected to the port of the outer tank 4 to seal the outer tank 4.

[0048] The descriptions of the orientation and relative positional relationships of the structures in this invention, such as front, back, left, right, up, and down, do not constitute a limitation of this invention, but are merely for the convenience of description.

Claims

1. An auxiliary device for installing a liquid nitrogen coil under cold shielding, characterized in that, It includes an inner tank (6), an outer tank (4) is provided around the outer periphery of the inner tank (6), and a spring-shaped coil (3), a pusher and a drive mechanism are provided between the inner tank (6) and the outer tank (4). The coil (3) is fitted around the outer periphery of the inner tank (6), the drive mechanism is located below the coil (3), the pusher is located on one side of the coil (3), and the pusher is slidably connected to the inner wall of the outer tank (4). The propulsion unit includes a transfer box (16). One end of the transfer box (16) is slidably connected to the inner wall of the outer tank (4) via a slider (12). The other end of the transfer box (16) is connected to the screw (5) via a clamping assembly. A connecting pipe (26) is rotatably installed on one side of the transfer box (16). The connecting pipe (26) is connected to the transfer box (16). The connecting pipe (26) is connected to the coil (3) via a liquid inlet pipe (25). A connecting pipe (15) is installed on the other side of the transfer box (16). A sealing cap (14) is installed at the end of the connecting pipe (15) away from the transfer box (16). The clamping assembly includes two symmetrically arranged arc-shaped clamps (18), with a fixing block (19) at the bottom of the arc-shaped clamps (18). The fixing block (19) is connected by a screw (20), and the arc-shaped clamps (18) are connected to the screw (5) by a thread. The driving mechanism includes a screw (5) arranged axially along the inner tank (6), a limiting block (10) is provided at the tail end of the screw (5), the screw (5) is rotatably connected to the limiting block (10), a turntable (22) is provided at the head end of the screw (5), the middle part of the screw (5) is connected to the outer tank (4) through a connecting rod (28), and a short rod (21) is provided between adjacent screws (5) on the same side.

2. The auxiliary device for installing liquid nitrogen coils under cold shields according to claim 1, characterized in that, The inner wall of the outer tank (4) is provided with a groove corresponding to the slider (12).

3. The auxiliary device for installing liquid nitrogen coils under cold shields according to claim 1, characterized in that, An injection pipe (8) is provided through one end of the inner tank (6), and a valve (7) is installed on the injection pipe (8).

4. The auxiliary device for installing liquid nitrogen coils under cold shields according to claim 1, characterized in that, A sealing cap (9) is provided at the port of the outer tank (4), and the sealing cap (9) is removable.

5. The auxiliary device for installing liquid nitrogen coils under cold shields according to claim 1, characterized in that, The bottom plate (1) is provided at the lower part of the outer tank (4), and the outer tank (4) is fixed to the bottom plate (1) through the support plate (2).

6. An installation method using the auxiliary device for installing liquid nitrogen coils with a cold shield as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Install the thruster; The installation steps include: S11. Install screws (5) on the inner tank (6), and install coils (3) around the outer periphery of the inner tank (6). The screws (5) are located between the inner tank (6) and the coils (3). S12. Two thrusters are arranged on the upper and lower sides of the inner tank (6). The connecting pipe (26) on the thruster is connected to the liquid inlet pipe (25). Liquid nitrogen is injected into the connecting pipe (15), and the two arc-shaped clamps (18) are closed. S2. Correct the installation position of the coil; The corrective steps include: S21. Rotate the screw (5), the arc-shaped clamp (18) moves, the position of the pusher moves on the screw (5) along with the arc-shaped clamp (18), the pusher pushes the coil (3) to move into the outer tank (4) to correct the installation position of the coil (3).

7. The installation method of the auxiliary device for installing cold shield liquid nitrogen coils according to claim 6, characterized in that, In step S21, a short rod (21) is set on the screw (5), and the arc-shaped clamp (18) moves to the short rod (21). The arc-shaped clamp (18) engages with the short rod (21), and the transfer box (16) is pushed by the long rod so that the arc-shaped clamp (18) contacts the next section of the screw (5). The screw (5) continues to rotate, and the arc-shaped clamp (18) continues to move on the screw (5).

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