A split type nitrogen liquefaction device

Abstract

The present invention proposes a split nitrogen liquefaction device, comprising: a refrigerator, a condensing core, an intermediate component, and a transfer cover for installation on the mouth of a container tank; a socket joint is provided on the transfer cover; the interior of the intermediate component has a chamber, a mounting seat is provided on the top of the intermediate component, and the intermediate component is connected and conducted with the socket joint via a connecting pipe; the refrigerator is installed on the mounting seat, and the cold head of the refrigerator is located inside the intermediate component; the condensing core is made of metal, and has a plurality of closely arranged strip rods, and the condensing core is located in the chamber and installed on the cold head of the refrigerator. The present invention solves the problem of liquid nitrogen evaporation loss caused by instrument heating and container heat leakage in liquid nitrogen immersion refrigeration equipment in remote areas or laboratories with strict management, and can adapt to various complex installation environments.

Description

Technical Field

[0001] The invention relates to the technical field of liquid nitrogen recovery, and in particular to a split type nitrogen liquefaction device. Background Art

[0002] In equipment that uses liquid nitrogen immersion as a cooling mode, the evaporation of liquid nitrogen caused by the heat generated by the equipment itself or the heat leakage of the container containing liquid nitrogen will cause liquid nitrogen loss. Generally, the loss of liquid nitrogen needs to be met by replenishing liquid nitrogen. However, for laboratories in remote areas or strict management, it is time-consuming to purchase and replenish liquid nitrogen in a timely manner. Summary of the invention

[0003] In order to solve the technical problems existing in the background technology, the present invention proposes a split nitrogen liquefaction device.

[0004] The present invention provides a split type nitrogen liquefaction device, comprising: a refrigerator, a condensing core, an intermediate component, and a transfer cover for installation on the mouth of a container tank;

[0005] A socket interface is provided on the transfer cover;

[0006] The middle component has a chamber inside, a mounting seat is provided at the top of the middle component, and the middle component is connected and conducted with the socket interface via a connecting pipe;

[0007] The refrigerator is mounted on the mounting base, and the cold head of the refrigerator is located inside the middle component;

[0008] The condensing core is made of metal and has a plurality of closely spaced bar-shaped rods. The condensing core is located in the chamber and is mounted on the cold head of the refrigerator.

[0009] Preferably, the intermediate component includes an outer shell and an inner shell arranged inside the outer shell, and a spacing is reserved between the outer shell and the inner shell to form a clamping cavity, and the interior of the clamping cavity is a vacuum environment; the connecting tube is connected to the inner shell, and a clamping cavity is provided between the inner and outer walls of the connecting tube, and the clamping cavity of the connecting tube is connected to the clamping cavity of the intermediate component to form a vacuum environment.

[0010] Preferably, the inner shell body is provided with an inner corrugated expansion section in the middle part between its two ends; the connecting pipe comprises an outer tube and an inner tube arranged inside the outer tube, and the clamping cavity of the connecting pipe is the space between the outer tube and the inner tube; the outer tube is connected and conducted with the outer shell body, the inner tube is connected and conducted with the inner shell body, and the outer tube has an outer corrugated expansion section.

[0011] Preferably, the inner shell is coated with a heat-insulating material, and the outer shell is provided with a vacuum port.

[0012] Preferably, a shock-absorbing support is installed on the mounting seat.

[0013] Preferably, a gland that matches its thread is provided at the top of the socket joint, the gland has a plug hole, and a sealing ring is provided between the gland and the end face of the socket joint; the connecting pipe is inserted into the socket joint through the plug hole on the gland and is tightened and fixed by the gland.

[0014] Preferably, a support rod is provided on the adapter cover, and two liquid level sensors are provided on the support rod at intervals along the length direction thereof.

[0015] Preferably, the adapter cover is also provided with a wiring port and a first wiring core seat installed at the wiring port.

[0016] Preferably, the top of the middle component is also provided with a main pipe connected to its chamber and a plurality of branch pipes branching out from the main pipe, wherein: at least one branch pipe is connected to a pressure detector, one branch pipe is connected to a safety valve, and another branch pipe serves as a wiring pipe, and a second wiring core seat is arranged at the port of the wiring pipe.

[0017] Preferably, it also includes a transfer tube 1 and a transfer tube 2, both of which are integrated in the transfer cover, and both of which are provided with valves for controlling the on-off of the transfer tubes.

[0018] In the present invention, the adapter cover is used to be installed at the mouth of a container tank filled with liquid nitrogen, the mounting seat at the upper end of the middle component is used to support the refrigerator, the connecting pipe at the lower end of the middle component is used to connect the socket joint, and the connecting pipe is used to guide the nitrogen after the liquid nitrogen in the container tank evaporates to the inside of the middle component. When the nitrogen enters the inside of the middle component, it fully contacts with the refrigeration core condensation core densely covered with strip rods, and is re-condensed to form liquid nitrogen under the action of the condensation core, and flows back into the container tank along the connecting pipe to reduce the loss of liquid nitrogen, thereby solving the problem of liquid nitrogen evaporation loss caused by instrument heating and container heat leakage in liquid nitrogen immersion refrigeration equipment in remote areas or laboratories with strict management. The device does not need to change the structure of the original equipment, can be directly installed, has no installation space restrictions, and can adapt to various complex installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a split nitrogen liquefaction device proposed by the present invention;

[0020] Figure 2 This is a schematic structural diagram of the intermediate component in a split-type nitrogen liquefaction device proposed by the present invention;

[0021] Figure 3 for Figure 2 Middle AA section view;

[0022] Figure 4 This is a schematic structural diagram of the condensing core in a split-type nitrogen liquefaction device proposed by the present invention;

[0023] Figure 5 This is a schematic diagram of the assembly of the condensing core and the refrigerator in a split-type nitrogen liquefaction device proposed by the present invention;

[0024] Figure 6 This is a schematic diagram of the assembly of the gland and the socket joint in a split nitrogen liquefaction device proposed by the present invention;

[0025] Figure 7 This is a schematic structural diagram of the transfer cover in a split nitrogen liquefaction device proposed by the present invention;

[0026] Figure 8 This is a schematic structural diagram of a frame in a split-type nitrogen liquefaction device proposed by the present invention;

[0027] Fig. 9 It is a schematic diagram of the assembly of a split nitrogen liquefaction device proposed by the present invention when it is applied to a liquid nitrogen cryostat;

[0028] Fig.10 The present invention is a schematic diagram of the internal structure of a split nitrogen liquefaction device and a liquid nitrogen cryostat after assembly. DETAILED DESCRIPTION

[0029] Reference Figure 1-5 The present invention provides a split nitrogen liquefaction device, comprising: a refrigerator 1, a condensing core 2, an intermediate component 3, and a transfer cover 4;

[0030] The adapter cover 4 is used to be installed at the mouth of a container tank filled with liquid nitrogen, and a socket joint 7 is provided on the adapter cover 4. The middle component 3 has a chamber inside, and the middle component 3 includes an outer shell 31 and an inner shell 32 arranged inside the outer shell 31. The inner shell 32 is coated with a heat insulating material outside. A space is reserved between the outer shell 31 and the inner shell 32 to form a sandwich cavity. A vacuum port is provided on the outer shell 31 to evacuate the outer shell 31 by vacuum evacuation so that the inside of the sandwich cavity is a vacuum environment.

[0031] A mounting seat 13 is provided at the top of the middle component 3, and the inner shell 32 of the middle component 3 is connected and communicated with the socket interface 7 via the connecting pipe 301. A clamping cavity is provided between the inner and outer walls of the connecting pipe 301, and the clamping cavity of the connecting pipe 301 is communicated with the clamping cavity of the middle component 3 to form a vacuum environment.

[0032] The refrigerator 1 is installed on the mounting base 13, and the cold head of the refrigerator 1 is located inside the middle component 3. Specifically, the refrigerator 1 can adopt a small Stirling refrigerator. The condensing core 2 is made of metal and has a plurality of densely arranged strip rods. The condensing core 2 is located in the chamber and installed on the cold head of the refrigerator 1. Specifically, the condensing core 2 is a rectangular bar formed at the angle where any longitudinal groove and any transverse groove intersect by processing a plurality of criss-cross grooves on a piece of copper material. The condensing core 2 forms a complex strip rod structure through simple groove processing, which reduces the production cost, and the groove design can guide the medium to flow evenly, increase the heat transfer coefficient, and accelerate the condensation efficiency.

[0033] When working, the adapter cover 4 is directly installed at the mouth of the container tank filled with liquid nitrogen, and the connecting pipe 301 at the lower end of the middle part 3 is connected to the socket joint 7 to guide the nitrogen after the liquid nitrogen in the container tank evaporates to the inside of the middle part 3. When the nitrogen enters the inside of the middle part 3, it fully contacts the refrigeration core condensation core 2 with dense strip rods, and re-condenses to form liquid nitrogen under the action of the condensation core 2, and flows back to the container tank along the connecting pipe 301 to reduce the loss of liquid nitrogen. The structure of the vacuum cavity of the middle part 3 and the connecting pipe 301 can effectively isolate the transfer of external heat, and prevent the condensed liquid nitrogen from returning to the nitrogen state due to the influence of external heat.

[0034] In addition, in this embodiment, an inner corrugated expansion section 321 is provided at the middle part between the two ends of the inner shell 32, so as to buffer through the inner corrugated expansion section 321, so as to prevent the vibration force generated when the refrigerator 1 is working from being transmitted to the lower end equipment via the inner shell 32. At the same time, the connecting pipe 301 in this embodiment includes an outer pipe and an inner pipe arranged inside the outer pipe, and the clamping cavity of the connecting pipe 301 is the space between the outer pipe and the inner pipe; the outer pipe is connected and conducted with the outer shell 31, and the inner pipe is connected and conducted with the inner shell 32, and the outer pipe has an outer corrugated expansion section 3011, so as to prevent the vibration force of the refrigerator 1 from being transmitted to the lower end equipment via the outer shell 31 through the outer corrugated expansion section 3011.

[0035] A shock-absorbing support 14 is installed on the mounting seat 13 . During operation, the mounting seat 13 is mounted on a corresponding device through the shock-absorbing support 14 to prevent the vibration force of the refrigerator 1 from being transmitted to the corresponding device through the mounting seat 13 .

[0036] A support rod is provided on the adapter cover 4, and two liquid level sensors 9 are provided on the support rod at intervals in the length direction. The two liquid level sensors 9 can monitor the minimum liquid level and the maximum liquid level of the liquid nitrogen inside the device, so that the staff can quickly respond when the liquid level reaches the minimum liquid level / maximum liquid level. In addition, in order to facilitate wiring, a wiring port is provided on the adapter cover 4 in this embodiment, and a first wiring core seat 10 is provided at the wiring port to facilitate the lead-out of the line and also facilitate the quick plug-in between the line and the power supply.

[0037] A main pipe connected to the chamber and a plurality of branch pipes branching out from the main pipe are arranged on the top of the middle part 3, wherein: at least one branch pipe is connected to a pressure detector 15 for detecting the internal pressure of the entire refrigeration system. One branch pipe is connected to a safety valve 16 to protect the safe operation of the system. Another branch pipe is used as a wiring pipe, and a second wiring core seat 17 is arranged at the port of the wiring pipe to facilitate the lead-out of the line.

[0038] Reference Figure 6 The top of the socket joint 7 is provided with a gland 11 which is threadedly matched with the gland 11. The gland 11 has an insert hole. A sealing ring 12 is provided between the gland 11 and the end face of the socket joint 7. The connecting pipe 301 is inserted into the socket joint 7 through the insert hole on the gland 11, and then the gland 11 is tightened to compress the sealing ring 12 to squeeze the connecting pipe 301, so that the connecting pipe 301 is fixed in the socket joint 7 and forms a seal with the socket joint 7.

[0039] Reference Figure 7 The present invention proposes a split nitrogen liquefaction device, which also includes a transfer tube 1 5 and a transfer tube 2 6. The transfer tube 1 5 and the transfer tube 2 6 are integrated in the transfer cover 4, and the transfer tube 1 5 and the transfer tube 2 6 are provided with valves 8 for controlling the opening and closing thereof. When in use, the transfer tube 1 5 and the transfer tube 2 6 can be used to directly add liquid nitrogen into the container tank without dismantling the device. In addition, in the specific use process, when there is no liquid nitrogen supply on site, the transfer tube 1 5 and the transfer tube 2 6 are also used to transport high-purity nitrogen, so as to complete the condensation of nitrogen with the help of the device.

[0040] As can be seen from the above, the present invention solves the problem of liquid nitrogen evaporation loss caused by instrument heating and container heat leakage in liquid nitrogen immersion refrigeration equipment in remote areas or laboratories with strict management, and there is no need to change the structure of the original equipment, and it can be directly installed without installation space restrictions, and can adapt to various complex installation environments.

[0041] Reference Figure 8 A split nitrogen liquefaction device also includes a frame 18, and the frame 18 has a storage chamber inside; the shock-absorbing support 14 is installed on the top of the frame 18. When in use, the frame 18 can be directly set up on the equipment in need.

[0042] Reference Figure 9-10 A transfer cover 4 in a split nitrogen liquefaction device is installed at the tank mouth of the liquid nitrogen cryostat 19 and forms a seal on the tank mouth, and the socket joint 7 arranged on the transfer cover 4, and the lower ends of the transfer tube 1 5 and the transfer tube 2 6 are all located inside the liquid nitrogen cryostat 19.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A split nitrogen liquefaction device, characterized in that: include: A refrigerator (1), a condensing core (2), an intermediate component (3), and a transfer cover (4) for mounting on the mouth of a container; A socket joint (7) is provided on the transfer cover (4); The middle component (3) has a chamber inside, a mounting seat (13) is provided at the top end of the middle component (3), and the middle component (3) is connected and conducted to the socket interface (7) via a connecting pipe (301); The refrigerator (1) is mounted on the mounting seat (13), and the cold head of the refrigerator (1) is located inside the middle component (3); The condensing core (2) is made of metal and has a plurality of closely spaced bar-shaped rods. The condensing core (2) is located in the chamber and is mounted on the cold head of the refrigerator (1).

2. A split type nitrogen liquefaction device according to claim 1, characterized in that: The intermediate component (3) comprises an outer shell (31) and an inner shell (32) arranged inside the outer shell (31), and a spacing is reserved between the outer shell (31) and the inner shell (32) to form a clamping cavity, and the interior of the clamping cavity is a vacuum environment; the connecting pipe (301) is connected to the inner shell (32), a clamping cavity is provided between the inner and outer walls of the connecting pipe (301), and the clamping cavity of the connecting pipe (301) is connected to the clamping cavity of the intermediate component (3) to form a vacuum environment.

3. A split type nitrogen liquefaction device according to claim 2, characterized in that: The inner shell (32) is provided with an inner corrugated expansion section (321) at a middle portion between the two ends thereof; the connecting pipe (301) comprises an outer pipe and an inner pipe arranged inside the outer pipe, and the clamping cavity of the connecting pipe (301) is the space between the outer pipe and the inner pipe; the outer pipe is connected and communicated with the outer shell (31), the inner pipe is connected and communicated with the inner shell (32), and the outer pipe has an outer corrugated expansion section (3011).

4. A split type nitrogen liquefaction device according to claim 2, characterized in that: The inner shell (32) is coated with a heat insulating material, and the outer shell (31) is provided with a vacuum extraction port.

5. A split type nitrogen liquefaction device according to claim 1, characterized in that: A shock absorbing support (14) is mounted on the mounting seat (13).

6. A split type nitrogen liquefaction device according to claim 1, characterized in that: The top of the socket joint (7) is provided with a gland (11) threadably matched therewith, the gland (11) having an insertion hole, and a sealing ring (12) is provided between the gland (11) and the end surface of the socket joint (7); the connecting pipe (301) is inserted into the socket joint (7) through the insertion hole on the gland (11) and is screwed and fixed by the gland (11).

7. The split type nitrogen liquefaction device according to claim 1, characterized in that: A support rod is provided on the adapter cover (4), and two liquid level sensors (9) are provided on the support rod at intervals along the length direction of the support rod.

8. The split type nitrogen liquefaction device according to claim 1, characterized in that: The adapter cover (4) is also provided with a wiring opening and a first wiring core seat (10) installed at the wiring opening.

9. The split type nitrogen liquefaction device according to claim 1, characterized in that: The top of the middle component (3) is also provided with a main pipe communicating with the chamber thereof and a plurality of branch pipes branching out from the main pipe, wherein: at least one branch pipe is connected to a pressure detector (15), one branch pipe is connected to a safety valve (16), and another branch pipe is used as a wiring pipe, and a second wiring core seat (17) is provided at the port of the wiring pipe.

10. A split type nitrogen liquefaction device according to any one of claims 1 to 9, characterized in that: It also includes a first transfer tube (5) and a second transfer tube (6), wherein the first transfer tube (5) and the second transfer tube (6) are both integrated in the transfer cover (4), and the first transfer tube (5) and the second transfer tube (6) are both provided with valves (8) for controlling the opening and closing thereof.

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