Low temperature control device

Abstract

The invention relates to the technical field of temperature control, in particular to a low-temperature temperature control device, and aims to solve the problem that an existing cooling device is poor in temperature control effect. Therefore, the low-temperature temperature control device comprises a liquid nitrogen tank, a gas conveying pipeline, a heating assembly and a heat preservation assembly. A sealing cover is arranged at a tank opening of the liquid nitrogen tank; the gas conveying pipeline comprises an outer pipe and an inner pipe located in the outer pipe, the first end of the outer pipe is fixedly connected with the sealing cover, the first end of the inner pipe penetrates through the sealing cover and extends into the liquid nitrogen tank, and a first vacuum space is formed between the outer pipe and the inner pipe; the heating assembly can heat and gasify liquid nitrogen into nitrogen; the heat preservation assembly comprises an outer shell, an inner shell and a cold conduction shell which are sequentially nested from outside to inside, a second vacuum space is formed between the outer shell and the inner shell, a flow channel is formed between the inner shell and the cold conduction shell, the two ends of the flow channel communicate with the inner pipe and the atmosphere correspondingly, and the cold conduction shell is provided with a storage cavity. Therefore, heat loss in the nitrogen transmission process can be reduced, and the low-temperature temperature control effect on the storage cavity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature control, and in particular provides a low-temperature temperature control device. Background Art

[0002] In the research and testing of physics, chemistry, materials, biology and other fields, a temperature control device is needed to make the sample to be tested and its surrounding environment reach and maintain a specific target temperature. For example, in the testing process of physical adsorption instrument, chemical adsorption instrument, thermogravimetric analyzer, X-ray diffraction analyzer, magnetic suspension balance and other instruments, temperature control devices are needed according to different samples and experimental purposes.

[0003] The existing technology generally achieves high temperature control in the range of room temperature to about 1800℃ by means of electric heating air bath, vacuum heating, oil bath, water bath, sand bath, etc.; achieves temperature control near room temperature by water bath; achieves low temperature control in the range of 4℃ to about -50℃ by means of compressor refrigeration and alcohol bath, antifreeze bath or semiconductor cooling sheet; and achieves liquid nitrogen temperature control of about -196℃ by liquid nitrogen bath. The existing temperature control devices have problems such as being unsuitable for the temperature range of -50℃ to -150℃, poor heat insulation effect, and poor temperature control effect.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing temperature-lowering device has poor temperature control effect.

[0006] The present invention provides a low-temperature temperature control device, comprising: A liquid nitrogen tank, wherein the liquid nitrogen tank is filled with liquid nitrogen, and a sealing cover is provided at the tank opening of the liquid nitrogen tank, and the sealing cover is provided on the tank opening; A gas transmission pipeline, comprising an outer tube and an inner tube located in the outer tube, wherein a first end of the outer tube is fixedly connected to the sealing cover, a first end of the inner tube passes through the sealing cover and extends into the liquid nitrogen tank, and the first end of the inner tube is located above the liquid level of the liquid nitrogen, and a first vacuum space is defined between the outer tube and the inner tube; A heating assembly, comprising a threading tube and a heating component, wherein a first end of the threading tube passes through the cover and extends below the liquid surface of the liquid nitrogen, a second end of the threading tube is exposed to the atmosphere, and the heating component is disposed at the first end of the threading tube; and The heat preservation component comprises an outer shell, an inner shell and a cold conduction shell which are stacked in sequence from the outside to the inside, a second vacuum space is provided between the outer shell and the inner shell, a flow channel is provided between the inner shell and the cold conduction shell, both ends of the flow channel are respectively connected to the inner tube and the atmosphere, and the cold conduction shell has a storage cavity.

[0007] In the preferred technical solution of the above-mentioned low-temperature temperature control device, the low-temperature temperature control device also includes a liquid injection pipeline and a valve arranged on the liquid injection pipeline, and the first end of the liquid injection pipeline is connected to the sealing cover and communicated with the liquid nitrogen tank.

[0008] In a preferred technical solution of the above-mentioned low-temperature temperature control device, the low-temperature temperature control device further includes a pressure relief valve installed on the cover, and the pressure relief valve is connected to the liquid nitrogen tank.

[0009] In the preferred technical solution of the above-mentioned low-temperature temperature control device, the low-temperature temperature control device further comprises a three-way pipe fitting installed on the sealing cover, a first port of the three-way pipe fitting is connected to the liquid nitrogen tank, the threading tube passes through the first port and the second port of the three-way pipe fitting, and a first sealing member is provided between the second end of the threading tube and the second port; and / or The pressure relief valve is fixedly arranged on the three-way pipe fitting, and the pressure relief valve is communicated with the third port of the three-way pipe fitting.

[0010] In the preferred technical solution of the above-mentioned low-temperature temperature control device, the first vacuum space is connected to the second vacuum space, a vacuum extraction interface is provided on the outer tube, a first end of the vacuum extraction interface is connected to the first vacuum space, and a second end of the vacuum extraction interface is connected to the vacuum extraction equipment.

[0011] In the preferred technical scheme of the above-mentioned low-temperature temperature control device, a first interface and a second interface are respectively opened on the outer shell and the inner shell near the first end of the flow channel, the caliber of the first interface is larger than the caliber of the second interface, a first sealing joint is arranged at the first interface, a first end of the first sealing joint is connected to the outer shell, a second end of the first sealing joint is connected to the outer tube, a second sealing joint is arranged at the second interface, the second sealing joint is sleeved in the first sealing joint, a first end of the second sealing joint is connected to the inner shell, a second end of the second sealing joint is connected to the inner tube through the first interface, the inner tube is connected to the first end of the flow channel through the second sealing joint, a third vacuum space is formed between the first sealing joint and the second sealing joint, and the first vacuum space is connected to the second vacuum space through the third vacuum space.

[0012] In the preferred technical solution of the above-mentioned low-temperature temperature control device, a third interface and a fourth interface are respectively provided on the outer shell and the inner shell near the second end of the flow channel, the caliber of the third interface is larger than the caliber of the fourth interface, a third sealing joint is provided at the third interface, a first end of the third sealing joint is connected to the outer shell, a fourth sealing joint is provided at the fourth interface, the fourth sealing joint is sleeved in the third sealing joint, a first end of the fourth sealing joint is connected to the inner shell, a second end of the fourth sealing joint is connected to the first end of the exhaust pipe passing through the third interface, the second end of the exhaust pipe is connected to the atmosphere, and a second sealing member is provided between the second end of the third sealing joint and the second end of the exhaust pipe.

[0013] In the preferred technical solution of the above-mentioned low-temperature temperature control device, the low-temperature temperature control device also includes a controller, a temperature sensor is arranged on the cold shell, the temperature sensor is connected to the controller signal, and the controller can adjust the heating power of the heating component according to the signal fed back by the temperature sensor.

[0014] In the preferred technical solution of the above-mentioned low-temperature temperature control device, a suspension structure is provided on the outer shell, and the heat preservation component can be fixed by the suspension structure.

[0015] In the preferred technical solution of the above-mentioned low-temperature temperature control device, a third sealing member is provided between the first end of the inner tube and the sealing cover.

[0016] It can be understood by those skilled in the art that the technical solution of the present invention provides a low-temperature temperature control device, including: a liquid nitrogen tank, a gas pipeline, a heating component and a heat preservation component. Among them, the liquid nitrogen tank is filled with liquid nitrogen, and a cover is provided at the tank mouth of the liquid nitrogen tank, and the cover is provided on the tank mouth; the gas pipeline includes an outer tube and an inner tube located in the outer tube, the first end of the outer tube is fixedly connected to the cover, the first end of the inner tube passes through the cover and extends into the liquid nitrogen tank, and the first end of the inner tube is located above the liquid level of the liquid nitrogen, and there is a first vacuum space between the outer tube and the inner tube; the heating component includes a threading tube and a heating component, the first end of the threading tube passes through the cover and extends below the liquid level of the liquid nitrogen, the second end of the threading tube is exposed to the atmosphere, and the heating component is provided at the first end of the threading tube; the heat preservation component includes an outer shell, an inner shell and a cold conduction shell stacked in sequence from the outside to the inside, there is a second vacuum space between the outer shell and the inner shell, there is a flow channel between the inner shell and the cold conduction shell, the two ends of the flow channel are respectively connected to the inner tube and the atmosphere, and the cold conduction shell has a storage cavity. When the above technical solution is adopted, the present invention can reduce the heat conduction of nitrogen and maintain the low temperature state of nitrogen during the transmission process, thereby improving the temperature control effect. Specifically, the gas transmission pipeline is composed of an outer tube and an inner tube. By adopting a double-layer tube structure, a first vacuum space is formed between the outer tube and the inner tube, which helps to reduce heat conduction, reduce heat loss, and maintain the low temperature state of the gas in the inner tube; the insulation component adopts a multi-layer overlapping design, which is an outer shell, an inner shell and a cold-conducting shell from the outside to the inside. A second vacuum space is formed between the outer shell and the inner shell, which further enhances the insulation effect, reduces the heat loss of nitrogen, and improves the temperature control effect.

[0017] Furthermore, the low temperature temperature control device of the present invention further comprises a liquid injection pipeline and a valve arranged on the liquid injection pipeline, wherein the first end of the liquid injection pipeline is connected to the cover and communicated with the liquid nitrogen tank. With this arrangement, the replenishment of liquid nitrogen becomes more convenient. The user can inject liquid nitrogen into the tank through the liquid injection pipeline without opening the cover of the liquid nitrogen tank, which greatly simplifies the operation process and improves work efficiency.

[0018] Furthermore, the low temperature temperature control device of the present invention further comprises a pressure relief valve installed on the cover, and the pressure relief valve is connected to the liquid nitrogen tank. Through this arrangement, it is ensured that the pressure in the liquid nitrogen tank does not exceed the normal working pressure, thereby improving safety.

[0019] Furthermore, the first vacuum space is connected to the second vacuum space, and a vacuum interface is provided on the outer tube, the first end of the vacuum interface is connected to the first vacuum space, and the second end of the vacuum interface is connected to the vacuum device. Through this arrangement, it is ensured that a vacuum environment is maintained between the outer tube and the inner tube and between the outer shell and the inner shell, so as to further reduce heat conduction and improve the temperature control effect of the low temperature control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which: Figure 1 It is a structural schematic diagram of the low-temperature temperature control device of the present invention; Figure 2 It is a structural schematic diagram of the liquid nitrogen tank of the present invention; Figure 3 is a cross-sectional view of a liquid nitrogen tank of the present invention; Figure 4 It is a schematic structural diagram of the heat preservation assembly of the present invention; Figure 5 It is a cross-sectional view of the thermal insulation assembly of the present invention.

[0021] List of reference numerals: 1. Liquid nitrogen tank; 11. Cover; 111. Sealing gasket; 12. Tank mouth; 2. gas transmission pipeline; 21. outer tube; 211. first vacuum space; 212. vacuum extraction interface; 22. inner tube; 221. third sealing member; 3. Heating assembly; 31. Threading tube; 32. Heating member; 4. Insulation assembly; 41. Outer shell; 411. Second vacuum space; 412. Suspension structure; 42. Inner shell; 421. Flow channel; 43. Cooling shell; 431. Storage chamber; 432. Temperature sensor; 44. First sealing joint; 441. Third vacuum space; 45. Second sealing joint; 46. Third sealing joint; 461. Second sealing member; 47. Fourth sealing joint; 48. Exhaust pipe; 5. Liquid injection pipeline; 51. Valve; 6. Pressure relief valve; 7. Three-way pipe fitting; 71. First sealing member. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. For example, although the following embodiments are introduced in conjunction with a low-temperature temperature control device, the low-temperature temperature control device provided by the present invention is also applicable to other products that need to solve the problem of poor thermal insulation effect of the cooling device.

[0023] It should be noted that, in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Based on the problem of poor temperature control effect of the existing cooling devices pointed out in the background technology, the present invention provides a low-temperature temperature control device, which aims to effectively solve the problem of poor insulation effect and poor temperature control effect of the existing cooling devices by improving the thermal insulation performance of the gas transmission pipeline and the thermal insulation component.

[0025] like Figures 1 to 5 As shown, the present invention provides a low-temperature temperature control device, including: a liquid nitrogen tank 1, a gas pipeline 2, a heating component 3 and a heat preservation component 4. Among them, the liquid nitrogen tank 1 is filled with liquid nitrogen, and a cover 11 is provided at the tank mouth 12 of the liquid nitrogen tank 1, and the cover 11 is covered on the tank mouth 12; the gas pipeline 2 includes an outer tube 21 and an inner tube 22 located in the outer tube 21, the first end of the outer tube 21 is fixedly connected to the cover 11, the first end of the inner tube 22 passes through the cover 11 and extends into the liquid nitrogen tank 1, and the first end of the inner tube 22 is located above the liquid level of the liquid nitrogen, and there is a first vacuum space 211 between the outer tube 21 and the inner tube 22; the heating component 3 includes a threading tube 31 and a heating member 32 The first end of the threading tube 31 passes through the cover 11 and extends below the liquid level of liquid nitrogen, the second end of the threading tube 31 is exposed to the atmosphere, and the heating component 32 is arranged at the first end of the threading tube 31; the insulation component 4 includes an outer shell 41, an inner shell 42 and a cold conduction shell 43 which are stacked from the outside to the inside in sequence, a second vacuum space 411 is provided between the outer shell 41 and the inner shell 42, a flow channel 421 is provided between the inner shell 42 and the cold conduction shell 43, both ends of the flow channel 421 are respectively connected to the inner tube 22 and the atmosphere, and the cold conduction shell 43 has a storage cavity 431.

[0026] The liquid nitrogen tank 1 is the core part of the low temperature temperature control device, and is used to store liquid nitrogen. The tank opening 12 of the liquid nitrogen tank 1 is designed with a cover 11, and the cover 11 is tightly covered on the tank opening 12 to ensure that the liquid nitrogen will not leak out.

[0027] For example, the cover 11 in the present invention is a flange ring, which is sealed and connected to the tank opening 12 by bolts or welding. The outer tube 21 is sealed and connected to the flange ring by welding. Furthermore, a sealing gasket 111 (such as Figure 2 As shown in the figure, when the flange ring is connected by bolts or other fastening methods, the gasket will be compressed and fill the tiny bumps on the sealing surface, thereby achieving a good sealing effect and ensuring that cryogenic nitrogen or liquid nitrogen will not leak.

[0028] like Figure 5As shown, the gas transmission pipeline 2 is composed of an outer tube 21 and an inner tube 22, and adopts a double-layer tube structure. The first end of the outer tube 21 is fixedly connected to the cover 11 of the liquid nitrogen tank 1, and the first end of the inner tube 22 passes through the cover 11 and extends into the liquid nitrogen tank 1, but remains above the liquid nitrogen level, so that the nitrogen in the liquid nitrogen tank 1 is discharged through the inner tube 22. In addition, a first vacuum space 211 is formed between the outer tube 21 and the inner tube 22, which helps to reduce heat conduction, reduce heat loss, and maintain the low temperature state of the gas in the inner tube 22.

[0029] Exemplarily, the gas pipeline 2 in the present invention includes a first pipeline and a second pipeline, wherein the outer tube 21 of the first pipeline is made of metal, and the outer tube 21 of the second pipeline is a metal bellows with flexibility. The first end of the outer tube 21 of the first pipeline is welded to the cover 11, the second end of the outer tube 21 of the first pipeline is connected to the first end of the outer tube 21 of the second pipeline by a snap seal, and the second end of the outer tube 21 of the second pipeline is connected to the outer shell 41 of the insulation component 4 by a snap seal. The inner tube 22 runs through the outer tube 21 of the first pipeline and the outer tube 21 of the second pipeline, and the inner tube 22 in the present invention is a hose.

[0030] By making the outer tube 21 of the first pipeline into a metal material, the strength and rigidity of the connection between the gas pipeline 2 and the cover 11 can be improved, and the connection can be effectively prevented from being broken and causing nitrogen leakage.

[0031] By making the outer tube 21 of the second pipeline a metal bellows, the metal bellows can easily cope with various complex spatial layouts and installation requirements, such as bending, twisting, etc. More importantly, the bellows can withstand a certain degree of stretching and compression without destroying its structural integrity, thereby allowing the insulation assembly 4 to move or adjust its position when necessary.

[0032] By setting the inner tube 22 as a hose, the overall flexibility of the pipeline can be further enhanced. The hose material has good flexibility and corrosion resistance, and can adapt to bends of various shapes and directions without breaking or leaking. This allows the inner tube 22 to fit closely to the curved path of the outer tube 21, ensuring smooth transmission of low-temperature nitrogen, while also preventing damage due to movement of the pipeline.

[0033] like Figure 2 and Figure 3 As shown, the heating assembly 3 includes a threading tube 31 and a heating member 32. The first end of the threading tube 31 extends below the liquid nitrogen level, while the second end is exposed to the atmosphere. The heating member 32 is installed at the first end of the threading tube 31, and its function is to heat the liquid nitrogen to gasify it into low-temperature nitrogen. By controlling the heating member 32, the gasification rate and temperature of the nitrogen can be regulated.

[0034] For example, Figure 3As shown, the heating component 32 in the present invention is a spiral heating tube, in which a heating wire is placed, and a wiring harness is passed through the threading tube 31, and the heating wire is connected to an external power source through the wiring harness. When the spiral heating tube is energized, the current in the heating wire generates heat through the resistor. This heat is rapidly transferred to the liquid nitrogen through the metal tube wall, thereby heating part of the liquid nitrogen and gasifying it into low-temperature nitrogen. Furthermore, in other embodiments, the heating component 32 can also be other heating components 32 such as a heating wire and a heating plate, and the present invention does not specifically limit the heating method of the heating component 32.

[0035] like Figure 4 and Figure 5 As shown, the insulation component 4 adopts a multi-layer overlapping design, which is an outer shell 41, an inner shell 42 and a cold-conducting shell 43 from the outside to the inside. A second vacuum space 411 is formed between the outer shell 41 and the inner shell 42. This design further enhances the insulation effect and reduces heat loss. A flow channel 421 is designed between the inner shell 42 and the cold-conducting shell 43. The two ends of the flow channel 421 are respectively connected to the inner tube 22 and the atmosphere, thereby allowing low-temperature nitrogen to flow therein. The cold-conducting shell 43 is also designed with a storage cavity 431, which can be used to place samples that need to be low-temperature controlled, tested or stored at low temperatures.

[0036] When low temperature control is required, the heating component 32 of the heating assembly 3 is started, and the heating component 32 heats the liquid nitrogen to vaporize it to form low temperature nitrogen. The vaporized low temperature nitrogen flows out through the inner tube 22 and enters the flow channel 421 of the insulation assembly 4. The low temperature nitrogen flows in the flow channel 421 and is further temperature-adjusted through the storage cavity 431 of the cold conduction shell 43 to cool the sample in the storage cavity 431, thereby achieving cooling and low temperature control effects. In the whole process, the first vacuum space 211 between the outer tube 21 and the inner tube 22 and the second vacuum space 411 between the outer shell 41 and the inner shell 42 can effectively reduce the cold loss of nitrogen during transportation, thereby maintaining the temperature of the low temperature nitrogen and improving the temperature control effect.

[0037] The low-temperature temperature control device of the present invention provides low-temperature nitrogen through the gasification process of liquid nitrogen. At the same time, by designing the gas transmission pipeline 2 into a double-layer tube structure, heat conduction is effectively reduced, and the low temperature state of nitrogen during the transmission process is maintained. By controlling the power of the heating component 32 of the heating component 3, the device can adjust the temperature and gasification rate of nitrogen as needed, thereby improving the cooling efficiency and flexibility. In addition, the multi-layer design of the insulation component 4 further enhances the insulation performance of the entire device, ensuring a good low-temperature temperature control effect.

[0038] Preferably, the low temperature control device further comprises a controller (not shown in the figure), and a temperature sensor 432 (such as Figure 5As shown), the temperature sensor 432 is connected to the controller signal, and the controller can adjust the heating power of the heating component 32 according to the signal fed back by the temperature sensor 432.

[0039] The controller, as the control center of the low temperature control device, is responsible for receiving signals from various sensors and processing and making decisions on these signals according to preset logic and algorithms. In the present invention, the controller can adjust the heating power of the heating component 32 according to the signal fed back by the temperature sensor 432.

[0040] The temperature sensor 432 provided on the cold-conducting shell 43 is used to monitor the temperature inside the low-temperature temperature control device in real time. These sensors convert temperature data into electrical signals and transmit them to the controller through signal lines. The controller determines the current temperature inside the device based on the received temperature signals.

[0041] By adding a controller and a temperature sensor 432, the low-temperature temperature control device realizes real-time monitoring and intelligent control of the internal temperature. This enables the device to automatically adjust the heating power according to changes in the external environment and internal needs, thereby maintaining a stable temperature environment in the storage chamber 431. In addition, intelligent control enables the heating component 32 to adjust the heating power according to actual needs, avoiding unnecessary energy waste. This helps to reduce the energy consumption of the device and improve energy efficiency. By real-time monitoring and adjusting the temperature, the low-temperature temperature control device can also better cope with changes in the external environment and fluctuations in the internal temperature. This helps to improve the stability and reliability of the device and ensure that it can maintain excellent temperature control performance in various applications.

[0042] Exemplarily, in the present invention, the controller can adjust the heating power of the heating component 32 according to the difference between the actual temperature of the cold-conducting shell 43 and the target temperature. When the power of the heating component 32 is increased, the flow rate of the low-temperature nitrogen generated increases, thereby further reducing the temperature in the storage chamber 431; when the power of the heating component 32 is reduced, the flow rate of the low-temperature nitrogen generated decreases, thereby further increasing the temperature in the storage chamber 431. Through the real-time automatic control of the controller, the actual temperature of the storage chamber 431 can be stabilized at the target value, thereby improving the temperature control effect of the storage chamber 431.

[0043] Preferably, if Figure 2 As shown, the low temperature temperature control device further includes a liquid injection pipeline 5 and a valve 51 arranged on the liquid injection pipeline 5 . The first end of the liquid injection pipeline 5 is connected to the sealing cover 11 and communicated with the liquid nitrogen tank 1 .

[0044] The first end of the liquid injection pipeline 5 is connected to the sealing cover 11 to ensure that it is connected to the inside of the liquid nitrogen tank 1. By opening the valve 51 arranged on the liquid injection pipeline 5, new liquid nitrogen can be easily injected into the liquid nitrogen tank 1 to replenish the amount of liquid nitrogen reduced due to gasification.

[0045] When the low-temperature temperature control device is operating normally, the heating component 3 heats the liquid nitrogen as required to gasify it to form low-temperature nitrogen. The low-temperature nitrogen flows out through the inner tube 22 of the gas transmission pipeline 2, enters the flow channel 421 of the insulation component 4, and is finally transported to the part that needs to be cooled. When the amount of liquid nitrogen in the liquid nitrogen tank 1 is reduced to a certain level (usually determined by a liquid level monitoring device or manual observation), liquid nitrogen needs to be replenished. The valve 51 on the liquid injection pipeline 5 is opened, and new liquid nitrogen is injected into the liquid nitrogen tank 1 through the liquid injection pipeline 5. After the injection is completed, the valve 51 is closed to ensure the sealing of the liquid nitrogen tank 1 and the purity of the internal environment.

[0046] The liquid nitrogen replenishment becomes more convenient by providing the liquid injection pipeline 5 and the valve 51. The user can inject liquid nitrogen into the tank through the liquid injection pipeline 5 without opening the cover 11 of the liquid nitrogen tank 1, which greatly simplifies the operation process and improves work efficiency.

[0047] Exemplarily, the liquid injection pipeline 5 in the present invention is made of metal, and a first end thereof is welded to the sealing cover 11 and is connected to the liquid nitrogen tank 1 .

[0048] Preferably, if Figure 2 As shown, the low temperature temperature control device further includes a pressure relief valve 6 installed on the sealing cover 11 , and the pressure relief valve 6 is connected to the liquid nitrogen tank 1 .

[0049] The pressure relief valve 6 is connected to the inside of the liquid nitrogen tank 1. When the internal pressure of the liquid nitrogen tank 1 exceeds the preset safety value, the pressure relief valve 6 will automatically open to release the excess pressure. This helps to prevent safety hazards such as container rupture or leakage caused by excessive internal pressure.

[0050] During the pressure release process, the design of the pressure relief valve 6 ensures that the pressure release is smooth and controllable. Once the internal pressure drops to a safe range, the pressure relief valve 6 will automatically close to prevent external air or other impurities from entering the liquid nitrogen tank 1.

[0051] It should be noted that a spring and a seal are provided inside the pressure relief valve 6 of the present invention. When the pressure inside the liquid nitrogen tank 1 increases, the spring is compressed and the seal opens, allowing gas to escape from the liquid nitrogen tank 1, thereby reducing the pressure. When the pressure drops to a safe range, the spring returns to its original state and the seal closes to prevent the gas from continuing to escape.

[0052] Preferably, if Figure 2 As shown, the low-temperature temperature control device also includes a three-way pipe fitting 7 installed on the cover 11, the first port of the three-way pipe fitting 7 is connected to the liquid nitrogen tank 1, the threading tube 31 passes through the first port and the second port of the three-way pipe fitting 7, a first sealing member 71 is arranged between the second end of the threading tube 31 and the second port, the pressure relief valve 6 is fixedly arranged on the three-way pipe fitting 7, and the pressure relief valve 6 is connected to the third port of the three-way pipe fitting 7.

[0053] The three-way pipe fitting 7 is installed on the cover 11 to ensure communication with the inside of the liquid nitrogen tank 1. The three-way pipe fitting 7 has three ports for connecting different pipes or components. In the present invention, the first port is connected to the liquid nitrogen tank 1, the second port is used for the threading tube 31 to pass through, and a first sealing member 71 is provided to ensure sealing, and the third port is connected to the pressure relief valve 6. By providing the three-way pipe fitting 7, the integrated installation of the threading tube 31 and the pressure relief valve 6 is realized, the structure of the low-temperature temperature control device is simplified, and the installation difficulty and cost are reduced.

[0054] The first sealing member 71 is disposed between the second end of the threading tube 31 and the second port of the three-way pipe fitting 7, thereby ensuring the sealing between the threading tube 31 and the three-way pipe fitting 7, preventing leakage of liquid nitrogen or nitrogen gas, and maintaining the pressure and temperature inside the device stable. The pressure relief valve 6 is fixedly disposed on the three-way pipe fitting 7 and communicated with the third port of the three-way pipe fitting 7. When the internal pressure of the liquid nitrogen tank 1 exceeds the preset safety value, the pressure relief valve 6 automatically opens to release the pressure, and the gas in the liquid nitrogen tank 1 is discharged into the atmosphere through the first port and the third port in turn, thereby protecting the low-temperature temperature control device from overpressure damage.

[0055] Exemplarily, the first seal 71 may be a rubber seal, such as a seal made of polyurethane, fluororubber, silicone, etc.; the first seal 71 may also be a metal seal, such as a sealing ring, a nut sealing sleeve, a gasket, etc. made of metals such as stainless steel and nickel alloy. The present invention does not limit the specific type of the first seal 71, as long as the sealing between the threading tube 31 and the three-way pipe fitting 7 can be ensured.

[0056] Preferably, if Figure 3 and Figure 5 The first vacuum space 211 is connected to the second vacuum space 411 . A vacuum interface 212 is provided on the outer tube 21 . A first end of the vacuum interface 212 is connected to the first vacuum space 211 , and a second end of the vacuum interface 212 is connected to a vacuum device.

[0057] By connecting two vacuum spaces (the first vacuum space 211 and the second vacuum space 411), a unified vacuum environment is formed, thereby further reducing the heat conduction path and improving the thermal insulation performance. The vacuum interface 212 is arranged on the outer tube 21, which is convenient for connecting with an external vacuum device. The first end of the vacuum interface 212 is connected to the first vacuum space 211, and the second end is connected to the vacuum device. During the normal operation of the low-temperature temperature control device, the first vacuum space 211 and the second vacuum space 411 are continuously vacuumed by the vacuum device, thereby ensuring that a vacuum environment is maintained between the outer tube 21 and the inner tube 22 and between the outer shell 41 and the inner shell 42, so as to further reduce heat conduction and improve the temperature control effect of the low-temperature temperature control device.

[0058] Preferably, if Figure 5As shown, a first interface and a second interface are respectively provided on the outer shell 41 and the inner shell 42 near the first end of the flow channel 421, the caliber of the first interface is larger than the caliber of the second interface, a first sealing joint 44 is provided at the first interface, a first end of the first sealing joint 44 is connected to the outer shell 41, and a second end of the first sealing joint 44 is connected to the outer tube 21, and a second sealing joint 45 is provided at the second interface, the second sealing joint 45 is sleeved in the first sealing joint 44, a first end of the second sealing joint 45 is connected to the inner shell 42, and a second end of the second sealing joint 45 is connected to the inner tube 22 through the first interface, and the inner tube 22 is connected to the first end of the flow channel 421 through the second sealing joint 45, and a third vacuum space 441 is formed between the first sealing joint 44 and the second sealing joint 45, and the first vacuum space 211 is connected to the second vacuum space 411 through the third vacuum space 441.

[0059] The first end of the first sealing joint 44 is connected to the outer shell 41, and the second end is connected to the outer tube 21 (i.e., the outer tube 21 of the gas pipeline 2). The second sealing joint 45 is sleeved in the first sealing joint 44, and its first end is connected to the inner shell 42, and the second end is connected to the inner tube 22 (i.e., the inner tube 22 of the gas pipeline 2) through the first interface. This nested sealing joint design not only ensures the tightness of the connection, but also forms an additional vacuum space (the third vacuum space 441), further reducing heat conduction and enhancing the insulation effect. The third vacuum space 441 is formed between the first sealing joint 44 and the second sealing joint 45. It is connected with the first vacuum space 211 and the second vacuum space 411, so that the vacuum insulation layer of the entire low-temperature temperature control device forms a continuous and unified whole, significantly reducing heat conduction, so that the low-temperature temperature control device can better maintain a low temperature state. The setting of the first sealing joint 44 and the second sealing joint 45 ensures a tight connection between the pipelines, prevents gas leakage, and improves the sealing performance of the device.

[0060] Exemplarily, the first sealing joint 44 in the present invention is a threaded structure, and a threaded joint corresponding to the first sealing joint 44 is provided on the housing 41 surrounding the first interface. When the first end of the first sealing joint 44 is connected to the housing 41, the first sealing joint 44 is screwed to be threadedly connected to the threaded joint, and the installation is convenient and quick. The second end of the first sealing joint 44 is sealed and connected to the outer tube 21 (i.e., the outer tube 21 of the gas transmission pipeline 2) through a clamp to further improve the convenience of installation.

[0061] In addition, the second sealing joint 45 in the present invention is a flared tube and a clamp structure, the first end of the second sealing joint 45 is welded to the inner shell 42, and the second end is clamped to the inner tube 22 (i.e., the inner tube 22 of the gas pipeline 2). When the second end of the second sealing joint 45 is connected to the inner tube 22, the clamp is tightened, and the flared tube and the inner tube 22 are tightly clamped together to form a seal.

[0062] Preferably, if Figure 5 As shown, a third interface and a fourth interface are respectively provided on the outer shell 41 and the inner shell 42 near the second end of the flow channel 421. The caliber of the third interface is larger than that of the fourth interface. A third sealing joint 46 is provided at the third interface. The first end of the third sealing joint 46 is connected to the outer shell 41. A fourth sealing joint 47 is provided at the fourth interface. The fourth sealing joint 47 is sleeved in the third sealing joint 46. The first end of the fourth sealing joint 47 is connected to the inner shell 42. The second end of the fourth sealing joint 47 is connected to the exhaust pipe 48. The second end of the fourth sealing joint 47 passes through the third interface and is connected to the first end of the exhaust pipe 48. The second end of the exhaust pipe 48 is connected to the atmosphere. A second sealing member 461 is provided between the second end of the third sealing interface and the second end of the exhaust pipe 48.

[0063] The first end of the third sealing joint 46 is connected to the third interface of the outer shell 41, and the fourth sealing joint 47 is sleeved inside the third sealing joint 46, and the first end thereof is connected to the fourth interface of the inner shell 42. This nested sealing joint design ensures the tightness of the connection and helps to maintain the integrity of the vacuum insulation layer.

[0064] The second end of the fourth sealing joint 47 is connected to an exhaust pipe 48, which passes through the third interface and extends to the outside of the housing 41, and the second end of the exhaust pipe 48 is connected to the atmosphere. This design allows the nitrogen in the flow channel 421 to be discharged to the outside atmosphere through the exhaust pipe 48.

[0065] A second sealing member 461 is provided between the second end of the third sealing joint 46 (i.e., the portion of the exhaust pipe 48 passing through the housing 41) and the second end of the exhaust pipe 48. The function of the second sealing member 461 is to prevent external air from communicating with the interior of the low temperature control device through the exhaust pipe 48, thereby maintaining a vacuum environment inside the device.

[0066] Exemplarily, the second sealing member 461 may be a rubber sealing member, such as a sealing member made of polyurethane, fluororubber, silicone, etc.; the second sealing member 461 may also be a metal sealing member, such as a sealing ring, a nut sealing sleeve, a gasket, etc. made of metals such as stainless steel and nickel alloy. The present invention does not limit the specific type of the second sealing member 461, as long as the sealing between the exhaust pipe 48 and the third sealing joint 46 can be ensured.

[0067] Exemplarily, the third sealing joint 46 in the present invention is a threaded structure, and the outer shell 41 surrounding the third interface is provided with a threaded joint corresponding to the third sealing joint 46. When the first end of the third sealing joint 46 is connected to the outer shell 41, the third sealing joint 46 is screwed to be threadedly connected to the threaded joint, and the installation is convenient and quick.

[0068] In addition, the fourth sealing joint 47 in the present invention is a flared tube and a clamp structure, the first end of the fourth sealing joint 47 is welded to the inner shell 42, and the second end is clamped to the exhaust pipe 48. When the second end of the fourth sealing joint 47 is connected to the exhaust pipe 48, the clamp is tightened, and the flared tube and the exhaust pipe 48 are tightly clamped together to form a seal.

[0069] Preferably, if Figure 4 and Figure 5 As shown, a hanging structure 412 is provided on the shell 41 , and the heat preservation component 4 can be fixed by the hanging structure 412 .

[0070] The structural stability of the entire low-temperature temperature control device can be ensured by fixing the heat preservation component 4 through the suspension structure 412. This helps to prevent the heat preservation component 4 from being loosened or deformed during long-term use, thereby affecting its heat preservation effect.

[0071] For example, the suspension structure 412 can be designed with quick buckles, threaded connections, slide rails, etc., so that the insulation component 4 can be easily fixed on the suspension structure 412, and it is also convenient to disassemble and replace when necessary. The present invention does not limit the specific structure of the suspension structure 412, as long as it can conveniently fix the insulation component 4.

[0072] Preferably, if Figure 3 As shown, a third sealing member 221 is provided between the first end of the inner tube 22 and the sealing cover 11 .

[0073] The inner tube 22 is a key component for transmitting cooling medium (such as liquid nitrogen) in the low temperature temperature control device, and the sealing between the inner tube 22 and the cover 11 is of great importance. The addition of the third seal 221 can effectively prevent the cooling medium from leaking from the connection between the inner tube 22 and the cover 11 under high pressure or low temperature environment, thereby ensuring the vacuum environment and cooling efficiency inside the device.

[0074] For example, the third sealing member 221 may be a rubber sealing member, such as a sealing member made of polyurethane, fluororubber, silicone, etc.; the third sealing member 221 may also be a metal sealing member, such as a sealing ring, a nut sealing sleeve, a gasket, etc. made of metals such as stainless steel and nickel alloy. The present invention does not limit the specific type of the third sealing member 221, as long as the sealing between the inner tube 22 and the cover 11 can be ensured.

[0075] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A low temperature temperature control device, characterized in that: include: A liquid nitrogen tank (1), wherein the liquid nitrogen tank (1) is filled with liquid nitrogen, a sealing cover (11) is provided at a tank opening (12) of the liquid nitrogen tank (1), and the sealing cover (11) is covered on the tank opening (12); A gas transmission pipeline (2), comprising an outer tube (21) and an inner tube (22) located in the outer tube (21), wherein a first end of the outer tube (21) is fixedly connected to the sealing cover (11), a first end of the inner tube (22) passes through the sealing cover (11) and extends into the liquid nitrogen tank (1), and the first end of the inner tube (22) is located above the liquid level of the liquid nitrogen, and a first vacuum space (211) is provided between the outer tube (21) and the inner tube (22); A heating assembly (3), comprising a threading tube (31) and a heating component (32), wherein a first end of the threading tube (31) passes through the cover (11) and extends below the liquid surface of the liquid nitrogen, a second end of the threading tube (31) is exposed to the atmosphere, and the heating component (32) is arranged at the first end of the threading tube (31); and A heat preservation component (4) comprises an outer shell (41), an inner shell (42) and a cold conduction shell (43) which are stacked in sequence from the outside to the inside, a second vacuum space (411) is provided between the outer shell (41) and the inner shell (42), a flow channel (421) is provided between the inner shell (42) and the cold conduction shell (43), two ends of the flow channel (421) are respectively connected to the inner tube (22) and the atmosphere, and the cold conduction shell (43) has a storage cavity (431).

2. The low temperature temperature control device according to claim 1, characterized in that: The low temperature temperature control device further comprises a liquid injection pipeline (5) and a valve (51) arranged on the liquid injection pipeline (5); a first end of the liquid injection pipeline (5) is connected to the sealing cover (11) and communicates with the liquid nitrogen tank (1).

3. The low temperature control device according to claim 1, characterized in that: The low-temperature temperature control device further comprises a pressure relief valve (6) mounted on the sealing cover (11), wherein the pressure relief valve (6) is in communication with the liquid nitrogen tank (1).

4. The low temperature control device according to claim 3, characterized in that: The low-temperature temperature control device further comprises a three-way pipe fitting (7) mounted on the sealing cover (11), a first opening of the three-way pipe fitting (7) being in communication with the liquid nitrogen tank (1), the threading tube (31) passing through the first opening and the second opening of the three-way pipe fitting (7), a first sealing member (71) being provided between the second end of the threading tube (31) and the second opening; and / or The pressure relief valve (6) is fixedly arranged on the three-way pipe fitting (7), and the pressure relief valve (6) is in communication with a third port of the three-way pipe fitting (7).

5. The low temperature control device according to claim 1, characterized in that: The first vacuum space (211) is in communication with the second vacuum space (411); a vacuum extraction interface (212) is provided on the outer tube (21); a first end of the vacuum extraction interface (212) is in communication with the first vacuum space (211); and a second end of the vacuum extraction interface (212) is in communication with a vacuum extraction device.

6. The low temperature control device according to claim 5, characterized in that: A first interface and a second interface are respectively provided on the outer shell (41) and the inner shell (42) near the first end of the flow channel (421); the caliber of the first interface is larger than the caliber of the second interface; a first sealing joint (44) is provided at the first interface; a first end of the first sealing joint (44) is connected to the outer shell (41); a second end of the first sealing joint (44) is connected to the outer tube (21); a second sealing joint (45) is provided at the second interface; the second sealing joint (45) is sleeved on the first sealing joint (44), the first end of the second sealing joint (45) is connected to the inner shell (42), the second end of the second sealing joint (45) is connected to the inner tube (22) through the first interface, the inner tube (22) is connected to the first end of the flow channel (421) through the second sealing joint (45), a third vacuum space (441) is formed between the first sealing joint (44) and the second sealing joint (45), and the first vacuum space (211) is connected to the second vacuum space (411) through the third vacuum space (441).

7. The low temperature control device according to claim 5, characterized in that: A third interface and a fourth interface are respectively provided on the outer shell (41) and the inner shell (42) near the second end of the flow channel (421); the caliber of the third interface is larger than the caliber of the fourth interface; a third sealing joint (46) is provided at the third interface; a first end of the third sealing joint (46) is connected to the outer shell (41); a fourth sealing joint (47) is provided at the fourth interface; the fourth sealing joint (47) is sleeved in the third sealing joint (46); a first end of the fourth sealing joint (47) is connected to the inner shell (42); a second end of the fourth sealing joint (47) is connected to an exhaust pipe (48); a second end of the fourth sealing joint (47) passes through the third interface and is connected to a first end of the exhaust pipe (48); a second end of the exhaust pipe (48) is communicated with the atmosphere; a second sealing member (461) is provided between the second end of the third sealing interface and the second end of the exhaust pipe (48).

8. The low temperature temperature control device according to claim 1, characterized in that: The low-temperature temperature control device further comprises a controller, the cold-conducting shell (43) is provided with a temperature sensor (432), the temperature sensor (432) is signal-connected to the controller, and the controller can adjust the heating power of the heating component (32) according to a signal fed back by the temperature sensor (432).

9. The low temperature temperature control device according to any one of claims 1 to 8, characterized in that: The outer shell (41) is provided with a suspension structure (412), and the heat-insulating component (4) can be fixed by means of the suspension structure (412).

10. The low temperature temperature control device according to any one of claims 1 to 8, characterized in that: A third sealing member (221) is provided between the first end of the inner tube (22) and the sealing cover (11).

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