Micro-vacuum heat insulation cold box

Abstract

The invention discloses a micro vacuum heat insulation cold box, which relates to the technical field of cold boxes, and comprises a bottom cylinder and a plurality of groups of cylinder bodies sequentially connected with the top of the bottom cylinder, the section of each cylinder body is circular, and a transmission mechanism is arranged on the outer side of the bottom cylinder. By means of the round structure, the negative pressure resistance is greatly improved, the problems that a traditional square cold box easily sucks humid air and is not resistant to negative pressure are effectively solved, cooling capacity loss is reduced, the excellent low heat conductivity coefficient in the cold box is maintained, and long-acting maintenance-free is achieved; accurate positioning is achieved, connection sealing performance is guaranteed by extruding the sealing ring, the heat insulation effect of the cold box is guaranteed, dependence on a liquid nitrogen cold source is reduced through the design of the expansion machine in the equipment box, even if liquid nitrogen supply is insufficient, cooling capacity needed by production can be met through self-expansion refrigeration, the continuity of equipment operation is guaranteed, and production efficiency is improved. The on-site operation cost is reduced, and the comprehensive performance of the air separation system is improved.

Description

Technical Field

[0001] This invention relates to the field of cold box technology, specifically to a micro-vacuum insulated cold box. Background Technology

[0002] In the field of air separation, cold boxes are key equipment to ensure the stable operation of the system. They are mainly used to hold cryogenic equipment in air separation units, such as distillation columns and heat exchangers. By filling the inside with insulating materials, they reduce the heat exchange between the equipment and the external environment, ensuring that the cryogenic system operates under stable temperature conditions. This plays a vital role in the overall performance and energy consumption control of the air separation system.

[0003] The working principle of a cold box is based on the thermal insulation performance of insulation materials. Currently, the commonly used insulation material is expanded perlite (perlite sand), whose internal microporous structure can hinder heat transfer. When the cold box is working, the temperature of the low-temperature medium inside the equipment is much lower than the temperature of the outside environment. The cold box reduces the heat transfer from the outside through the thermal insulation effect of perlite, thus maintaining the internal low-temperature environment. At the same time, the cold box needs to maintain a certain pressure. Traditional cold boxes are often equipped with a breather valve to balance the pressure and perform inhalation or exhalation operations when the pressure changes.

[0004] However, existing technologies have many drawbacks. On the one hand, ordinary perlite has a high water absorption rate, and its thermal conductivity increases significantly after absorbing water, leading to increased cold loss. On the other hand, traditional square cold boxes have poor structural rigidity and are not pressure resistant. The setting of the breather valve makes it easy for humid air to enter, exacerbating cold loss. Moreover, they are not resistant to negative pressure and cannot be vacuumed, resulting in an oversized cold box design and increased costs. In addition, existing circular cold boxes rely on liquid nitrogen cold sources and lack their own refrigeration capacity. When the supply of liquid nitrogen is insufficient, the continuity of equipment production is difficult to guarantee. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a micro-vacuum insulated cold box to solve the technical problems in the background art mentioned above.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a micro-vacuum insulated cold box, comprising a bottom cylinder and multiple sets of cylinders connected sequentially to its top, wherein the cross-section of the cylinder is circular, which improves the ability to withstand negative pressure; A transmission mechanism is provided on the outside of the bottom cylinder. A positioning connection mechanism is provided at the four corners of the outer side of each group of cylinders. The transmission mechanism includes a transmission rod that is rotatably connected to the four corners of the bottom cylinder. The positioning connection mechanism is composed of a fixed cylinder and a connecting positioning rod inside it that are connected in a radially rotating and axially fixed manner. The fixed cylinder and the cylinder body are fixedly connected. The top of the transmission rod and the connecting positioning rod are both fixed with a plug-in assembly. The plug-in assembly is composed of a screw and a hexagonal connecting post that are fixedly connected from bottom to top. The transmission mechanism also includes a fixed ring, a drive ring, a gear ring, and a gear. The fixed ring is fixed to the outer wall of the bottom cylinder, and the drive ring and the gear ring are fixedly connected and rotatably connected to the top of the fixed ring. The gear is fixed to the bottom of the transmission rod and meshes with the gear ring. The transmission mechanism also includes a drive hole, and multiple sets of drive holes are evenly opened on the outside of the drive ring. When a tool is inserted into the drive hole, the drive ring can be driven to rotate under the action of external force. The bottom of the fixed cylinder is provided with a connecting positioning hole that mates with the connecting positioning rod, and a threaded ring corresponding to the screw is fixed at its inner bottom end. The bottom of the connecting positioning rod is provided with a connecting groove that mates with the hexagonal connecting post. The top of the upper set of cylinders is connected to a top cylinder, and a positioning connection mechanism is provided at the four corners of the outer side of the top cylinder. Multiple sets of cylinders and a set of top cylinders are provided with through holes that cooperate with the connecting positioning rod at the four corners. A top stabilizing ring is fixed on the outer side of the top cylinder, and the top stabilizing ring plays a role in fixing and supporting the positioning connection mechanism on its outer side. The lower set of cylinders has four support legs fixed at the four corners of the outer side, which are in contact with the ground. An equipment box is installed below the bottom cylinder and inside the four sets of support legs. An expander is installed inside the equipment box. Pipe connection flanges are provided on the outer side of one set of cylinders and the outer side of the equipment box. The pipe connection flanges are interconnected by pipes. The positioning and connecting mechanism also includes a guide slide plate, a spring, and a connecting groove. The guide slide plate is slidably connected inside the connecting groove, and its top is elastically connected to the connecting positioning rod by a spring. The cross-sections of the connecting groove and the hexagonal connecting post are both hexagonal, and the hexagonal connecting post inserted into the connecting groove can drive the connecting positioning rod to rotate radially relative to the fixed cylinder. Each set of cylinder body connections is fixed with a sealing ring, which serves to seal the cylinder body connection and improve the sealing effect of the cylinder body.

[0007] By adopting the above technical solutions, the circular structure design greatly improves the negative pressure resistance, effectively solving the problems of traditional square cold boxes being prone to absorbing humid air and not being able to withstand negative pressure. It reduces cold loss, maintains excellent low thermal conductivity inside the cold box, and achieves long-term maintenance-free operation. The unique positioning and transmission mechanism works together to not only achieve precise positioning when connecting the cylinder body, but also ensures the connection sealing by squeezing the sealing ring, ensuring the insulation effect of the cold box. The expander design inside the equipment box reduces the dependence on liquid nitrogen cold source. Even if the liquid nitrogen supply is insufficient, it can rely on its own expansion and refrigeration to meet the cold load required for production, ensuring the continuity of equipment operation, reducing on-site operating costs, and improving the overall performance of the air separation system. In addition, the design of multiple sets of lifting rings facilitates the hoisting of the cylinder body and top cylinder, improving installation efficiency and safety.

[0008] Furthermore, each of the multiple sets of positioning and connecting mechanisms has a lifting ring fixed to its outer side, and the inner side of the lifting ring is fixedly connected to the outer wall of the cylinder body and the top cylinder.

[0009] By adopting the above technical solution, each cylinder is connected to four sets of lifting rings, which can be used to stably lift the cylinder and top cylinder using a four-point lifting method.

[0010] In summary, the present invention has the following main advantages: Its circular structure design significantly improves its resistance to negative pressure, effectively solving the problems of traditional square cold boxes easily absorbing humid air and being unable to withstand negative pressure. This reduces cold loss, maintains excellent low thermal conductivity within the cold box, and achieves long-term maintenance-free operation. The unique positioning and transmission mechanism, working in conjunction with the cylinder connection mechanism, not only achieves precise positioning during cylinder connection but also ensures a tight seal through the compression sealing ring, guaranteeing the insulation effect of the cold box. The expander design within the equipment box reduces dependence on liquid nitrogen cold sources; even if liquid nitrogen supply is insufficient, it can rely on its own expansion cooling to meet the cold requirements of production, ensuring continuous equipment operation, reducing on-site operating costs, and improving the overall performance of the air separation system. Furthermore, the design of multiple lifting rings facilitates the hoisting of the cylinder body and top cylinder, improving installation efficiency and safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the entire invention; Figure 3 For the present invention Figure 2 Enlarged view of point A; Figure 4 This is an enlarged sectional view of the bottom cylinder structure of the present invention; Figure 5 This is an enlarged schematic diagram of a partial structure of the present invention; Figure 6 This is an enlarged sectional view of the structure of the cylinder body of the present invention; Figure 7 This is an enlarged sectional view of the positioning and connecting mechanism of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point B; Figure 9 This is an enlarged cross-sectional view of the top cylinder structure of the present invention; Figure 10 This is a partial enlarged schematic diagram of the structure of the present invention.

[0012] In the diagram: 1. Bottom cylinder; 2. Cylinder body; 3. Top cylinder; 4. Connecting hole; 5. Transmission mechanism; 501. Fixed ring; 502. Drive ring; 503. Gear ring; 504. Transmission rod; 505. Gear; 506. Drive hole; 6. Insertion assembly; 601. Screw; 602. Hexagonal connecting post; 7. Positioning connection mechanism; 701. Fixed cylinder; 702. Connecting positioning rod; 703. Threaded ring; 704. Guide slide plate; 705. Spring; 706. Connecting slide groove; 707. Connecting positioning hole; 8. Sealing ring; 9. Mating hole; 10. Lifting ring; 11. Top stabilizing ring; 12. Support leg; 13. Equipment box; 14. Pipe connection flange. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0014] The embodiments of the present invention will now be described. Example

[0015] like Figure 1-10 As shown in the figure, this embodiment is a micro-vacuum insulated cold box. Its structural design revolves around high-efficiency insulation, stable connection and independent refrigeration. It is mainly composed of components such as bottom cylinder 1, cylinder body 2, top cylinder 3, transmission mechanism 5, positioning and connection mechanism 7, and equipment box 13. The bottom cylinder 1, cylinder body 2, and top cylinder 3 are all made of 304 stainless steel and are made into a circular structure through professional plate rolling and welding processes. This circular design greatly enhances the cold box's resistance to negative pressure and reduces the risk of humid air intrusion. At the connection of each set of cylinder bodies 2, a special nitrile rubber sealing ring 8 is installed. Nitrile rubber has good oil resistance, wear resistance, and sealing properties, which can effectively fill the gaps between the cylinder bodies, prevent heat leakage, and improve the overall sealing performance of the cold box. The transmission mechanism 5 is installed on the outside of the bottom cylinder 1. The fixed ring 501 is welded to the outer wall of the bottom cylinder 1, providing a stable support base for the entire transmission structure. The drive ring 502 and the gear ring 503 are firmly connected by welding, and are rotatably connected to the fixed ring 501 with the help of high-precision bearings, ensuring smooth and stable rotation. The gear 505 is made of high-strength alloy steel and is installed at the bottom of the transmission rod 504 by key connection, precisely meshing with the gear ring 503 to ensure stable power transmission. Multiple drive holes 506 are evenly distributed on the outside of the drive ring 502. These drive holes 506 are adapted to special drive tools, making it convenient for operators to rotate the drive ring 502. The positioning and connecting mechanism 7 is set at the four outer corners of each set of cylinder body 2 and top cylinder 3. The fixed cylinder 701 is welded to the cylinder body 2 and a connecting positioning rod 702 is installed inside it. The two adopt a radial rotation and axial fixation connection method. The bottom of the fixed cylinder 701 is provided with a connecting positioning hole 707, which is used to cooperate with the connecting positioning rod 702 of the lower cylinder body 2 to achieve preliminary positioning. A threaded ring 703 is fixed at the bottom of the inner part of the fixed cylinder 701, which matches the screw 601 of the plug-in assembly 6. The bottom of the connecting positioning rod 702 is provided with a connecting groove 706, which cooperates with the hexagonal connecting post 602. The guide slide plate 704 slides in the connecting groove 706 and is elastically connected to the connecting positioning rod 702 through the spring 705. This can effectively buffer and adjust the force during the connection process and avoid interference between components. Both the connecting groove 706 and the hexagonal connecting post 602 are designed with hexagonal cross sections to ensure that after the hexagonal connecting post 602 is inserted, it can drive the connecting positioning rod 702 to rotate precisely radially relative to the fixed cylinder 701, so as to achieve precise positioning and connection. Support legs 12 are welded to the four corners of the outer side of the lower cylinder 2. The support legs 12 are made of Q345 carbon steel and are hot-dip galvanized to enhance their rust resistance. Rubber shock-absorbing pads are installed at the bottom of the support legs 12, which can increase the friction with the ground and reduce the transmission of vibration during equipment operation. An equipment box 13 is installed below the bottom cylinder 1. The equipment box 13 is made of carbon steel and contains an expander. Pipe connection flanges 14 are provided on the outer side of both the cylinder 2 and the equipment box 13. The expansion is connected through matching pipes so that the cold energy generated by the expander can be transported to the cold box to meet the process requirements and reduce the equipment's dependence on liquid nitrogen cold source. Lifting rings 10 are welded to the outside of multiple positioning and connecting mechanisms 7. The lifting rings 10 are forged from high-strength alloy steel and are firmly welded to the outer walls of the cylinder body 2 and the top cylinder 3. Each cylinder body 2 is connected to four sets of lifting rings 10. During equipment installation and maintenance, a four-point lifting method can be used to lift the cylinder body 2 and the top cylinder 3 through the lifting rings 10 using a crane, ensuring the stability and safety of the lifting process. Site preparation and foundation installation: At the installation site, select a flat and solid ground as the installation location for the cold box. Pre-treat the ground according to design requirements to ensure that the ground's levelness and load-bearing capacity meet the equipment requirements. Clean the bottom of the support legs 12, install the rubber shock-absorbing pads, and then fix the base cylinder 1 to the ground using anchor bolts. Use a level to measure and adjust, ensuring that the levelness error of the base cylinder 1 is within the allowable range. Equipment box installation: Use a crane to lift the equipment box 13 to the bottom cylinder 1, ensuring the connecting hole of the equipment box 13 is precisely aligned with the connecting hole 4 of the bottom cylinder 1. Secure the equipment box 13 to the bottom cylinder 1 using bolts or welding. After connection, seal the connection points to prevent leakage. Check the installation of the expander inside the equipment box 13 to ensure it is firmly fixed and all pipe connections are correct. Debug the expander and check its operating status to ensure it is functioning properly. Cylinder assembly: Using a crane, the first set of cylinders 2 is lifted by the lifting ring 10. The connecting positioning rod 702 at the top of the lower cylinder 2 is slowly and accurately inserted into the connecting positioning hole 707 of the fixed cylinder 701 at the four corners of the top of the bottom cylinder 1 to complete the initial positioning. During the connection process, pay attention to checking the position of the sealing ring 8 to ensure that it is not misaligned or damaged. Continue to lift other cylinders 2 and repeat the above operation to connect multiple sets of cylinders 2 in sequence. During the connection process, it is necessary to ensure that the position of each set of cylinders 2 is accurate and that the connecting positioning rod 702 and the connecting positioning hole 707 fit well. Top cylinder installation: Hoist the top cylinder 3 to the top of the uppermost cylinder 2, so that the connecting positioning rods 702 at the four corners of the bottom of the top cylinder 3 are inserted into the connecting positioning holes 707 of the top fixing cylinder 701 of the upper cylinder 2, and complete the initial positioning and insertion operation of the cold box body. Check the sealing and stability of each connection part again to ensure that the cold box body structure is installed correctly. Connection fastening and sealing: Prepare a special driving tool and insert it into the driving hole 506 of the driving ring 502. The operator rotates the driving tool clockwise, causing the driving ring 502 to rotate. The driving ring 502 drives the gear ring 503 to rotate, and the gear ring 503, through the gear 505, causes the four sets of transmission rods 504 to rotate synchronously. The insertion assembly 6 at the top of the transmission rods 504 rotates accordingly, and the screw 601 begins to mesh with the threaded ring 703. Since the screw 601 can only rotate and cannot move axially, the threaded ring 703 drives the fixed cylinder 701 to descend, thereby causing the upper cylinder 2 to descend relative to the lower cylinder 2, compressing the sealing ring 8. Under the action of multiple positioning connection mechanisms 7 of the head-to-tail transmission, the sealing rings 8 between multiple sets of cylinders 2 are evenly compressed, ensuring the connection and sealing of the entire cold box. During operation, pay attention to the operation of each component to ensure safe and smooth operation. Pipeline Connection and Commissioning: According to process requirements, select appropriate pipeline connection flanges 14 on the outside of the pipeline connection cylinder 2 and equipment box 13. When connecting the pipelines, ensure that the pipeline installation position is correct and the flange connection is tight. Use sealing gaskets and bolts to tighten them. After the connection is completed, perform pressure testing and sealing tests on the entire cold box system to check for leaks. Start the expander inside equipment box 13 to test the refrigeration effect and operational stability of the cold box. Make necessary adjustments and optimizations based on the test results to ensure that the cold box can operate normally and meet production requirements.

[0016] The working principle of this invention is as follows: When installing this equipment, the bottom cylinder 1 is first fixed on the ground by four sets of support legs 12, and then the equipment box 13 is installed below the bottom cylinder 1 and connected to its interior through the connecting hole 4. Then, the hoisting operation is carried out by the hoisting machinery through multiple sets of lifting rings 10 of the cylinder body 2, so that multiple sets of cylinder bodies 2 are connected to each other in sequence. Specifically, each set of cylinder 2 is equipped with a positioning and connecting mechanism 7 at the four corners of its outer side. The connecting positioning rod 702 set at the top of the lower cylinder 2 is inserted into the connecting positioning hole 707 opened at the bottom of the upper cylinder 2, so that the initial positioning and insertion operation can be performed between each two sets of cylinder 2. Finally, the top cylinder 3 is connected to the top of the uppermost cylinder 2, and then the initial positioning and insertion operation of the entire equipment is completed. The bottom cylinder 1, cylinder body 2, and top cylinder 3 are all made of circular structure. In other words, in terms of structural design, the negative pressure resistance of the circular cold box is greatly improved compared with the traditional square cold box. Without increasing the material thickness, the problems of square cold boxes being prone to absorbing humid air and not being able to withstand negative pressure are effectively solved by simply changing the shape. The excellent low thermal conductivity inside the cold box is maintained, achieving long-term maintenance-free operation. In addition, an expander is installed inside the equipment box 13, which reduces the equipment's dependence on liquid nitrogen. Even if the surrounding liquid nitrogen source is insufficient, it can rely on its own expansion and cooling to meet the cooling requirements of production, ensuring the continuity of equipment operation, reducing on-site operating costs as a whole, and improving the overall performance of the air separation system. After the initial positioning and connection of the equipment is completed, the staff uses tools such as rods to insert one end of the rod into a set of drive holes 506 on the drive ring 502. Then, the staff uses the rod to rotate the drive ring 502. The rotation of the drive ring 502 will drive the four sets of transmission rods 504 to rotate synchronously through the cooperation of the gear ring 503 and the gear 505. The top of the transmission rod 504 is fixed with the plug-in component 6. At this time, the screw 601 of the plug-in component 6 is exactly inside the fixed cylinder 701 and below the threaded ring 703. At this time, the hexagonal connecting post 602 is inserted into the connecting groove 706 that matches it. As can be seen from the above, when the screw 601 rotates, the outer thread of the screw 601 can gradually engage with the inside of the threaded ring 703. Since the lowest set of screws 601 can only rotate and cannot move axially, the threaded ring 703 is passively lowered under the action of the screw 601 rotation. This causes the upper set of cylinders 2 to descend relative to the lower set of cylinders 2 through the fixed cylinder 701. Since there is a sealing ring 8 between the two sets of cylinders 2, the descent of the upper cylinder 2 will compress the two sets of sealing rings 8 to a certain extent. Thus, under the action of the sealing rings 8 being compressed and deformed, the connection between the two sets of cylinders 2 is sealed. The hexagonal connecting post 602 of each set of plug-in components 6 can be plugged in to drive multiple sets of screws 601 to rotate synchronously. The fixed cylinder 701 and its internal connecting positioning rod 702 are radially rotatable and axially fixed. When the screw 601 pulls the fixed cylinder 701 down through the threaded ring 703, the connecting positioning rod 702 will also descend with the fixed cylinder 701. At this time, the hexagonal connecting post 602 will compress the guide slide plate 704 and the spring 705 to avoid interference. It will not affect the transmission process between the upper positioning connection mechanism 7 and the plug-in components 6. As can be seen from the above, since multiple sets of cylinder bodies 2 and multiple sets of positioning and connecting mechanisms 7 are installed sequentially, the upper cylinder body 2 will descend sequentially under the action of the transmission mechanism 5, thereby compressing and deforming the sealing rings 8 between each pair of cylinder bodies 2, thus ensuring the overall connection and sealing effect of the equipment.

[0017] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A micro-vacuum insulated cold box, comprising a bottom cylinder (1) and a plurality of cylinder bodies (2) sequentially connected to its top, characterized in that: The cross-section of the cylinder (2) is circular, which improves the ability to withstand negative pressure. A transmission mechanism (5) is provided on the outside of the bottom cylinder (1), and a positioning connection mechanism (7) is provided at the four corners of the outer side of each set of cylinder bodies (2). The transmission mechanism (5) includes a transmission rod (504) that is rotatably connected to the four corners of the bottom cylinder (1). The positioning connection mechanism (7) is composed of a fixed cylinder (701) and a connecting positioning rod (702) inside it that are radially rotated and axially fixed. The fixed cylinder (701) and the cylinder body (2) are fixedly connected. The top of the transmission rod (504) and the connecting positioning rod (702) are both fixed with a plug-in assembly (6). The plug-in assembly (6) is composed of a screw (601) and a hexagonal connecting post (602) that are fixedly connected from bottom to top. The bottom of the fixed cylinder (701) is provided with a connecting positioning hole (707) that cooperates with the connecting positioning rod (702), and a threaded ring (703) corresponding to the screw (601) is fixed at its bottom. The bottom of the connecting positioning rod (702) is provided with a connecting groove (706) that cooperates with the hexagonal connecting post (602).

2. The micro-vacuum insulated cold box according to claim 1, characterized in that: The top of the upper set of cylinders (2) is connected to a top cylinder (3), and a positioning connection mechanism (7) is provided at the four corners of the outer side of the top cylinder (3). The four corners of the multiple sets of cylinders (2) and the set of top cylinders (3) are provided with mating holes (9) that cooperate with the connecting positioning rod (702).

3. The micro-vacuum insulated cold box according to claim 1, characterized in that: The lower set of cylinders (2) has four support legs (12) fixed at the four corners of the outer side, which are in contact with the ground. The bottom cylinder (1) is equipped with an equipment box (13) located inside the four sets of support legs (12). An expander is installed inside the equipment box (13). Pipe connection flanges (14) are provided on the outer side of one set of cylinders (2) and the outer side of the equipment box (13). The pipe connection flanges (14) are interconnected by pipes.

4. The micro-vacuum insulated cold box according to claim 1, characterized in that: The transmission mechanism (5) further includes a fixed ring (501), a drive ring (502), a gear ring (503), and a gear (505). The fixed ring (501) is fixed to the outer wall of the bottom cylinder (1), and the drive ring (502) and the gear ring (503) are fixedly connected and rotated together on the top of the fixed ring (501). The gear (505) is fixed to the bottom of the transmission rod (504) and meshes with the gear ring (503).

5. The micro-vacuum insulated cold box according to claim 4, characterized in that: The transmission mechanism (5) also includes a drive hole (506), and multiple sets of drive holes (506) are evenly opened on the outside of the drive ring (502). When a tool is inserted into the drive hole (506), the drive ring (502) can be rotated under the action of external force.

6. The micro-vacuum insulated cold box according to claim 1, characterized in that: The positioning and connecting mechanism (7) further includes a guide slide plate (704), a spring (705) and a connecting groove (706). The guide slide plate (704) is slidably connected inside the connecting groove (706), and its top is elastically connected to the connecting positioning rod (702) by the spring (705).

7. The micro-vacuum insulated cold box according to claim 6, characterized in that: The cross-sections of the connecting groove (706) and the hexagonal connecting post (602) are both hexagonal, and the hexagonal connecting post (602) inserted into the connecting groove (706) can drive the connecting positioning rod (702) to rotate radially relative to the fixed cylinder (701).

8. The micro-vacuum insulated cold box according to claim 1, characterized in that: Each set of cylinder body (2) is fixed with a sealing ring (8), and the sealing ring (8) plays a sealing role at the connection of the cylinder body (2), thereby improving the sealing effect of the cylinder body (2).

9. The micro-vacuum insulated cold box according to claim 1, characterized in that: Each of the multiple positioning and connecting mechanisms (7) has a lifting ring (10) fixed on its outer side, and the inner side of the lifting ring (10) is fixedly connected to the outer wall of the cylinder (2) and the top cylinder (3). Each cylinder (2) is connected to four sets of lifting rings (10), and the cylinder (2) and the top cylinder (3) can be stably hoisted by a four-point hoisting method.

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