A double-layer structure for a cryogenic dewar, an assembling method thereof, a disassembling method thereof, and a temperature control method thereof

Abstract

The application belongs to the technical field of precision measurement, and discloses a double-layer structure for a low-temperature Dewar, an assembling method thereof, a disassembling method thereof and a temperature control method thereof. The double-layer structure comprises an outer sleeve, an inner sleeve and a sealing cover. An outer pipe joint is arranged on the outer sleeve, and the outer pipe joint is at least partially located outside the low-temperature Dewar. The outer pipe joint is in sealing connection with the low-temperature Dewar, so that the outer sleeve is sealingly arranged in the low-temperature Dewar. An inner pipe joint is arranged on the inner sleeve. A detection insertion rod is at least partially inserted into the inner sleeve, and the detection insertion rod is used for detecting a sample. The inner sleeve is inserted into the outer sleeve, and the inner pipe joint is in sealing connection with the outer pipe joint. The outer sleeve and the inner sleeve are both provided with a refrigerant. The sealing cover is arranged at the top end of the inner sleeve. Through the double-layer structure, the detection insertion rod can stably perform detection work, and damage of the detection insertion rod caused by sample replacement and temperature recovery can be prevented.

Description

Technical Field

[0001] This invention relates to the field of precision measurement technology, and in particular to a double-layer structure for a low-temperature Dewar, its assembly method, its disassembly method, and its temperature control method. Background Technology

[0002] Cryogenic Dewars are widely used in various precision measuring devices due to their ability to maintain extremely low temperatures for extended periods, ensuring stable operation in ultra-low temperature environments. Currently, detection probes operating below the liquid helium temperature range are typically inserted into cryogenic Dewars filled with liquid helium, and a single-layer cavity is usually provided to isolate the liquid helium from the detection probe.

[0003] However, the detection probe often needs to be removed from the cryogenic Dewar for operations such as sample replacement. To prevent the impact of large-scale temperature changes on the detection probe, one existing technology involves heating the cryogenic components on the detection probe to reheat it before directly removing the probe. However, due to uneven heating, condensation can easily occur in areas of the components far from the heat source when exposed to air, affecting the lifespan and operating condition of the detection probe. Another approach is to remove the single-layer cavity and the detection probe simultaneously. This results in prolonged contact between the liquid helium inside the cryogenic Dewar and the air, which can easily lead to liquid helium evaporation and contamination, hindering liquid helium recovery.

[0004] Furthermore, in precision measurement experiments, heating components are required to maintain a constant temperature at the sample location. Typically, the heating components are placed on the probe of the detection rod, and the temperature at the sample location is controlled by heat conduction through the probe. However, this heat conduction method has a temperature gradient, and the temperature of different heat conduction areas varies. In experiments, this temperature difference will affect the accuracy of the measurement results.

[0005] Therefore, there is a need to provide a double-layer structure for low-temperature Dewars, its assembly method, its disassembly method, and its temperature control method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a double-layer structure for a low-temperature Dewar, its assembly method, its disassembly method, and its temperature control method, which ensures that the detection probe can perform stable detection work, prevents damage to the detection probe caused by sample change and reheating, and prevents the cold source inside the low-temperature Dewar from evaporating into the air; reduces the rate and magnitude of pressure increase in the inner sleeve during disassembly; and eliminates the influence of temperature gradient during temperature control, ensuring the accuracy of measurement results.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A double-layer structure for low-temperature Dewars, comprising:

[0009] An outer tube is provided with an outer tube joint, the outer tube joint being at least partially located outside the cryogenic Dewar, and the outer tube joint being sealed to the cryogenic Dewar so that the outer tube is sealed inside the cryogenic Dewar;

[0010] The inner sleeve has an inner tube connector, and a detection probe is at least partially inserted into the inner sleeve. The detection probe is used to detect the sample. The inner sleeve is inserted into the outer sleeve, and the inner tube connector is detachably connected to the outer tube connector. Refrigerant is placed in both the outer sleeve and the inner sleeve.

[0011] A sealing cover is provided at the top of the inner sleeve.

[0012] Preferably, the double-layer structure for low-temperature Dewar further includes a temperature control unit, the temperature control unit comprising:

[0013] A heating assembly is disposed at the bottom of the inner sleeve;

[0014] A temperature measuring element is disposed on the detection plug rod and is used to collect temperature information inside the inner sleeve;

[0015] A temperature control component, which is communicatively connected to both the heating component and the temperature measuring element.

[0016] Preferably, the temperature control unit further includes a pressure sensor, which is used to collect the air pressure inside the outer tube, and the pressure sensor is communicatively connected to the temperature control component.

[0017] Preferably, the temperature control component includes a main controller and a secondary controller that are connected by communication. The main controller is connected by communication with the temperature measuring element, and the secondary controller is connected by communication with the pressure measuring element and the heating component.

[0018] An assembly method for the above-mentioned double-layer structure for cryogenic Dewar includes:

[0019] S1. Insert the outer sleeve into the low-temperature Dewar and fix the two together.

[0020] S2. Insert the detection rod into the inner sleeve, install the sealing cover on the top of the inner sleeve, and seal the lead wire of the detection rod through the wiring hole of the inner sleeve.

[0021] S3. Vacuum the inner sleeve through the inner tube joint, insert the inner sleeve into the outer sleeve and fix the two together, and vacuum the outer sleeve through the outer tube joint.

[0022] S4. Refrigerant is introduced into the inner sleeve through the inner pipe joint, and refrigerant is introduced into the outer sleeve through the outer pipe joint.

[0023] Preferably, the detection probe is fixed with an installation component, and after the detection probe is inserted into the inner sleeve, the installation component is fixedly connected to the inner tube joint.

[0024] A method for disassembling the above-mentioned double-layer structure for cryogenic Dewar includes:

[0025] S1. Evacuate the refrigerant inside the outer casing through the outer pipe joint;

[0026] S2. Disassemble the inner sleeve from the outer sleeve;

[0027] S3. Connect the air extraction pipe to the inner pipe joint, remove the inner sleeve from the outer sleeve and keep it for a set time;

[0028] S4. Evacuate the refrigerant in the inner sleeve through the inner tube joint, remove the sealing cover, and then take the detection probe out of the inner sleeve.

[0029] A temperature control method for the above-mentioned double-layer structure of a low-temperature Dewar includes:

[0030] S1. The temperature measuring element collects temperature information at the sample location and transmits the temperature information to the temperature control component;

[0031] S2. Compare the temperature information with the set temperature and determine whether the temperature information deviates from the set temperature. If so, proceed to step S3.

[0032] S3. The temperature control component generates a control signal and outputs it to the heating component to control the operation of the heating component.

[0033] Preferably, the inner sleeve is made of a thermally conductive material.

[0034] Preferably, in step S3, the temperature control component generates the control signal based on the temperature information and the collected air pressure information inside the outer tube.

[0035] Preferably, the temperature control component includes a main controller and a secondary controller connected by communication. In step S3, the main controller of the temperature control component generates an intermediate variable based on the temperature information, and the secondary controller of the temperature control component adjusts the intermediate variable based on the air pressure information to generate the control signal.

[0036] The beneficial effects of this invention are:

[0037] This invention provides a double-layer structure for use in a cryogenic Dewar. The double-layer structure includes an outer sleeve, an inner sleeve, and a sealing cover. The outer sleeve has an outer tube connector, which is at least partially located outside the cryogenic Dewar and is sealed to the cryogenic Dewar so that the outer sleeve is sealed inside the cryogenic Dewar. The inner sleeve has an inner tube connector, and a detection probe is at least partially inserted into the inner sleeve for detecting samples. The inner sleeve is inserted into the outer sleeve, and the inner tube connector is sealed to the outer tube connector. Refrigerant is placed inside both the outer sleeve and the inner sleeve. The sealing cover is located at the top of the inner sleeve.

[0038] This double-layer structure, housed within the cryogenic Dewar, provides the necessary ambient temperature for the test probe placed within the double-layer structure during cryogenic testing, while simultaneously isolating the cold source within the cryogenic Dewar from the test probe. The refrigerant within the inner and outer sleeves effectively transfers the cryogenic energy of the cold source, ensuring the test probe operates normally within the test temperature range and preventing damage or impact on testing accuracy due to temperature fluctuations. An outer tube connector on the outer sleeve, sealing it to the cryogenic Dewar, ensures excellent sealing, preventing the cold source within from contacting outside air. An inner tube connector on the inner sleeve, inserted into the outer sleeve, secures the inner sleeve within the outer sleeve through a sealed connection between the inner and outer tube connectors. This simple and convenient operation prevents refrigerant leakage from the outer sleeve. A sealing cover at the top of the inner sleeve ensures excellent airtightness, further preventing refrigerant leakage. When sample change is required, the fixing relationship between the outer and inner tube joints is released, and the inner sleeve is pulled out, allowing the testing probe to reheat inside the inner sleeve. At this time, the testing probe will not come into contact with air and produce condensation. Furthermore, the outer sleeve remains sealed within the low-temperature Dewar, meaning the low-temperature Dewar is always sealed, and the cold source inside will not come into contact with air. This double-layer structure ensures stable testing operation of the testing probe and prevents damage to the testing probe caused by sample change and reheating.

[0039] This invention provides a method for disassembling the above-mentioned double-layer structure for a low-temperature Dewar, the specific steps of which include: S1, evacuating the refrigerant inside the outer sleeve through the outer pipe joint; S2, disassembling the inner sleeve from the outer sleeve; S3, connecting the evacuation pipe to the inner pipe joint, removing the inner sleeve from the outer sleeve and holding it for a set time; S4, evacuating the refrigerant inside the inner sleeve through the inner pipe joint, removing the sealing cover, and then removing the detection probe from the inner sleeve.

[0040] To prevent refrigerant from leaking into the air and polluting the environment after the inner sleeve is removed, the refrigerant is evacuated from the outer sleeve via the outer pipe connector. The inner sleeve is then disconnected from the outer sleeve, meaning the connection between the inner and outer pipe connectors is released. After the inner sleeve is removed, refrigerant needs to be retained inside to allow the detection probe inside to quickly return to room temperature and avoid condensation. However, due to the rising temperature, the air pressure inside the inner sleeve will increase rapidly, potentially damaging the probe or other components of the detection probe. Therefore, by connecting the extraction pipe to the inner pipe connector and then removing the inner sleeve from the outer sleeve, and connecting the inner sleeve to the extraction pipe through the inner pipe connector, the rate and magnitude of the pressure rise in the inner sleeve can be reduced. This prevents a sharp increase in the pressure inside the inner sleeve and allows the detection probe to quickly warm up in the refrigerant environment. After maintaining the temperature for a set time, the detection probe returns to room temperature. After the detection probe returns to room temperature, the refrigerant inside the inner sleeve is evacuated through the inner pipe connector to prevent the refrigerant from flowing into the air and causing environmental pollution after the sealing cover is removed.

[0041] The present invention provides a temperature control method for the above-mentioned double-layer structure of low-temperature Dewar, the specific steps of which include: S1, the temperature measuring element collects temperature information at the sample location and transmits the temperature information to the temperature control component;

[0042] S2. Compare the temperature information with the set temperature and determine whether the temperature information deviates from the set temperature. If so, proceed to step S3. S3. The temperature control component generates a control signal and outputs it to the heating component to control the operation of the heating component.

[0043] After the temperature sensor collects the temperature information inside the inner sleeve in real time, it transmits the temperature information to the temperature control component. The temperature control component compares the temperature information with the set temperature and determines whether the temperature information deviates from the set temperature. If there is a deviation, the temperature control component generates a control signal based on the temperature information and the set temperature and outputs it to the heating component to control the heating component to work. The heating component, located at the bottom of the inner sleeve, heats the inside of the inner sleeve to ensure that the temperature at the sample location is at the set temperature. It can be understood that the set temperature is the test temperature zone. By controlling the heating component, a constant temperature at the sample location is ensured, avoiding temperature fluctuations from affecting the test conditions and the detection results of the probe. Furthermore, due to the convection effect of the refrigerant, the influence of temperature gradients can be effectively eliminated. In this embodiment, the temperature sensor is located on the probe of the detection probe to accurately collect the temperature at the sample location set on the probe. Attached Figure Description

[0044] Figure 1 This is a cross-sectional view of the double-layer structure for low-temperature Dewar provided by the present invention;

[0045] Figure 2This is a partial cross-sectional view of the double-layer structure for low-temperature Dewar provided by the present invention;

[0046] Figure 3 This is a flowchart of the assembly method for a double-layer structure of a low-temperature Dewar provided by the present invention;

[0047] Figure 4 This is a flowchart of the disassembly method for a double-layer structure of a low-temperature Dewar provided by the present invention;

[0048] Figure 5 This is a flowchart of the temperature control method for a double-layer structure of a low-temperature Dewar provided by the present invention.

[0049] In the picture:

[0050] 100. Low-temperature Dewar; 1001. Cover plate; 1002. Double-walled bottle body;

[0051] 1. Outer tube; 11. Outer tube fitting; 111. Outer tube interface;

[0052] 2. Inner sleeve; 21. Inner tube fitting; 211. Inner tube interface;

[0053] 3. Detection pin; 31. Lead wire; 311. Terminal; 32. Probe;

[0054] 4. Sealing cover; 41. Wiring hole;

[0055] 5. Installation components. Detailed Implementation

[0056] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0057] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0060] Example 1

[0061] Currently, detection probes operating below the liquid helium temperature range are typically inserted into cryogenic Dewars filled with liquid helium, and a single-layer cavity is usually used to isolate the liquid helium from the probe. However, the probe often needs to be removed from the cryogenic Dewar for operations such as sample replacement. To prevent the impact of large-scale temperature changes on the probe, existing technologies employ two methods: one is to first heat the cryogenic components on the probe for rewarming, and then directly remove the probe. However, due to uneven heating, condensation can easily occur in areas of the component far from the heat source when exposed to air, affecting the probe's lifespan and operating conditions. Another method is to remove the single-layer cavity and the probe simultaneously. This results in prolonged contact between the liquid helium inside the cryogenic Dewar and the air, which can easily lead to helium evaporation and contamination, hindering liquid helium recovery.

[0062] To solve the above problems, such as Figure 1 , Figure 2As shown, this embodiment provides a double-layer structure for a cryogenic Dewar (hereinafter referred to as the double-layer structure). This double-layer structure includes an outer sleeve 1, an inner sleeve 2, and a sealing cover 4. An outer tube connector 11 is provided on the outer sleeve 1. The outer tube connector 11 is at least partially located outside the cryogenic Dewar 100. The outer tube connector 11 is sealed to the cryogenic Dewar 100 so that the outer sleeve 1 is sealed inside the cryogenic Dewar 100. An inner tube connector 21 is provided on the inner sleeve 2. A detection rod 3 is at least partially inserted into the inner sleeve 2. The detection rod 3 is used to detect samples. The inner sleeve 2 is inserted into the outer sleeve 1, and the inner tube connector 21 is sealed to the outer tube connector 11. Refrigerant is placed in both the outer sleeve 1 and the inner sleeve 2. The sealing cover 4 is sealed to the top of the inner sleeve 2.

[0063] This double-layer structure, housed within the cryogenic Dewar 100, provides the necessary ambient temperature for the detection rod 3 placed within the double-layer structure during cryogenic testing, while simultaneously isolating the cold source within the cryogenic Dewar 100 from the detection rod 3. The refrigerant placed within the inner sleeve 2 and outer sleeve 1 effectively transfers the cryogenic energy from the cold source, ensuring the detection rod 3 operates normally within the test temperature range and preventing damage or impact on testing accuracy due to temperature fluctuations. An outer tube connector 11 is installed on the outer sleeve 1, sealingly connecting it to the cryogenic Dewar 100 to ensure the outer sleeve... 1. The sealing device is located inside the low-temperature Dewar 100, ensuring good sealing of the low-temperature Dewar 100 and preventing the cold source inside from contacting the outside air. An inner tube connector 21 is provided on the inner tube 2. After the inner tube 2 is inserted into the outer tube 1, the inner tube 2 is fixed inside the outer tube 1 through the sealed connection between the inner tube connector 21 and the outer tube connector 11. This is simple and convenient to operate and prevents leakage of the refrigerant contained in the outer tube 1. A sealing cover 4 is located at the top of the inner tube 2 to ensure good sealing of the inner tube 2 and prevent leakage of the refrigerant contained in the inner tube 2. When it is necessary to change samples, the fixing relationship between the outer tube connector 11 and the inner tube connector 21 is released, and the inner tube 2 is pulled out, allowing the detection probe 3 to reheat inside the inner tube 2. At this time, the detection probe 3 will not come into contact with air and generate condensation. Furthermore, the outer tube 1 is always sealed inside the low-temperature Dewar 100, meaning the low-temperature Dewar 100 is always in a sealed state, and the cold source inside will not come into contact with air. This double-layer structure ensures that the detection probe 3 can perform detection work stably, and also prevents damage to the detection probe 3 caused by sample change and reheating.

[0064] It should be noted that the cold source is selected based on the test temperature range required for testing the detection probe 3, and this embodiment does not impose any limitations on this. In this embodiment, the cold source inside the cryogenic Dewar 100 is liquid nitrogen.

[0065] Specifically, this double-layer structure also includes a temperature control unit (not shown in the figure). The temperature control unit includes a heating component, a temperature measuring element, and a temperature control component. The heating component is located at the bottom of the inner sleeve 2, and the temperature measuring element is located on the detection rod 3. The temperature measuring element is used to collect temperature information inside the inner sleeve 2. The temperature control component is communicatively connected to both the heating component and the temperature measuring element. The temperature control unit can actively adjust the temperature inside the double-layer structure to keep the temperature at the sample location constant. The temperature measuring element measures and monitors the temperature information inside the inner sleeve 2 in real time and transmits the temperature information to the temperature control component. The temperature control component controls the heating component to heat the inner sleeve 2 based on the temperature information, so that the temperature inside the inner sleeve 2 remains constant and within the test temperature range of the detection rod 3.

[0066] Specifically, the temperature control unit also includes a pressure sensor, which collects the air pressure inside the outer sleeve 1. The pressure sensor is communicatively connected to the temperature control component. The pressure sensor measures and monitors the pressure information inside the outer sleeve 1 in real time and transmits the pressure information to the temperature control component. The temperature control component controls the heating component to heat the sample based on the temperature and pressure information. It can be understood that within the sealed outer sleeve 1, the pressure information reflects the temperature information within the outer sleeve 1. Temperature fluctuations at the sample location originate from temperature fluctuations within both the inner sleeve 2 and the outer sleeve 1. Adjusting the temperature solely based on the temperature information within the inner sleeve 2 may be affected by temperature fluctuations within the outer sleeve 1. By considering the temperature fluctuations within both the inner sleeve 2 and the outer sleeve 1, precise control can be achieved.

[0067] In this embodiment, the temperature control component includes a main controller and a secondary controller connected by communication. The main controller is connected to the temperature sensor, and the secondary controller is connected to the pressure sensor and the heating component. The main controller outputs an intermediate variable to the secondary controller based on the temperature information fed back by the temperature sensor. The secondary controller adjusts the intermediate variable based on the pressure information fed back by the pressure sensor and then outputs it to the heating component to control the heating power of the heating component. The temperature fluctuations inside the inner sleeve 2 and the outer sleeve 1 are taken into account together to achieve precise temperature control.

[0068] Example 2

[0069] like Figures 1-3 As shown, this embodiment provides an assembly method for a double-layer structure for a low-temperature Dewar as described in Embodiment 1, the specific steps of which include:

[0070] S1. Insert the outer sleeve 1 into the low-temperature Dewar 100 and fix the two together.

[0071] S2. Insert the detection rod 3 into the inner sleeve 2; install the sealing cover 4 on the top of the inner sleeve 2, and seal the lead wire 31 of the detection rod 3 through the wiring hole 41 of the inner sleeve 2.

[0072] S3. Vacuum the inner sleeve 2 through the inner tube connector 21, insert the inner sleeve 2 into the outer sleeve 1 and fix the two together, and vacuum the outer sleeve 1 through the outer tube connector 11.

[0073] S4. Refrigerant is introduced into the inner sleeve 2 through the inner pipe connector 21, and refrigerant is introduced into the outer sleeve 1 through the outer pipe connector 11.

[0074] The outer sleeve 1 is fixedly inserted into the cryogenic Dewar 100 so that the outer tube joint 11 seals the cryogenic Dewar 100; after the detection rod 3 is inserted into the inner sleeve 2, the sealing cover 4 is installed on the top of the inner sleeve 2 so that the inner sleeve 2 is in a sealed state. Specifically, the sealing cover 4 is sealed and installed on the top of the inner sleeve 2 by sealing connection with the inner tube joint 21; the terminal 311 of the lead wire 31 of the detection rod 3 is sealed and passed through the wiring hole 41 of the inner sleeve 2 to achieve mechanical and functional connection, and the terminal 311... It can ensure airtightness, ensuring that air will not enter the inner sleeve 2 through the wiring hole 41, so as to prevent moisture and other components in the air from condensing and damaging the detection plug 3 inside the inner sleeve 2; by performing vacuum treatment on the inner sleeve 2 and the outer sleeve 1 through the inner tube connector 21 and the outer tube connector 11 respectively, it can prevent moisture in the air inside the inner sleeve 2 from affecting subsequent testing, and the vacuum environment helps to improve the heat transfer efficiency of the refrigerant; the filling of refrigerant can provide the necessary cooling effect. It should be noted that the selection and filling amount of refrigerant are determined according to the test temperature zone of the detection plug 3.

[0075] Specifically, such as Figure 1 and Figure 2 As shown, the low-temperature Dewar 100 includes a double-layer bottle body 1002 and a cover plate 1001. The cover plate 1001 has an opening for inserting the outer tube 1. After the outer tube 1 is inserted into the low-temperature Dewar 100, the outer tube connector 11 is located outside the low-temperature Dewar 100. The outer tube connector 11 is then sealed and connected to the cover plate 1001.

[0076] It should be noted that, as Figure 1As shown, the outer pipe connector 11 is provided with an outer pipe interface 111, which is connected to the outer sleeve 1. The inner pipe connector 21 is provided with an inner pipe interface 211, which is connected to the inner sleeve 2. During vacuuming, the suction pipe is connected to the outer pipe interface 111 so that the suction pipe is connected to the outer sleeve 1 to evacuate the inside; the suction pipe is connected to the inner pipe interface 211 so that the suction pipe is connected to the inner sleeve 2 to evacuate the inside. During refrigerant charging, the charging pipe is connected to the outer pipe interface 111 so that the charging pipe is connected to the outer sleeve 1 to charge refrigerant into it; the charging pipe is connected to the inner pipe interface 211 so that the charging pipe is connected to the inner sleeve 2 to charge refrigerant into it. At other times, sealing plugs are used to seal the inner pipe interface 211 and the outer pipe interface 111 respectively to ensure good sealing of the inner sleeve 2 and the outer sleeve 1.

[0077] Specifically, such as Figure 2 As shown, a mounting piece 5 is fixed to the detection probe 3. After the detection probe 3 is inserted into the inner sleeve 2, the mounting piece 5 is fixedly connected to the inner tube connector 21. The fixed connection between the mounting piece 5 and the inner tube connector 21 provides a stable support point for the detection probe 3, reducing the risk of loosening or displacement of the detection probe 3 due to vibration or external force. The fixed connection of the mounting piece 5 also makes it easier to disassemble and replace the detection probe 3 when changing samples, saving detection time.

[0078] Example 3

[0079] like Figure 1 , Figure 2 and Figure 4 As shown, this embodiment provides a method for disassembling the double-layer structure of a low-temperature Dewar as described in Embodiment 1. The specific steps include:

[0080] S1. Evacuate the refrigerant in the outer casing 1 through the outer pipe joint 11;

[0081] S2. Disassemble the inner sleeve 2 from the outer sleeve 1;

[0082] S3. After connecting the air extraction pipe to the inner pipe connector 21, remove the inner sleeve 2 from the outer sleeve 1 and keep it for a set time.

[0083] S4. Evacuate the refrigerant in the inner sleeve 2 through the inner tube connector 21, remove the sealing cover 4, and take the detection probe 3 out of the inner sleeve 2.

[0084] The refrigerant inside the outer sleeve 1 is evacuated through the outer pipe connector 11 to prevent it from leaking into the air and polluting the environment after the inner sleeve 2 is removed. The inner sleeve 2 is then disconnected from the outer sleeve 1, meaning the fixed connection between the inner pipe connector 21 and the outer pipe connector 11 is released. After the inner sleeve 2 is removed, refrigerant needs to be retained inside to allow the detection probe 3 inside the inner sleeve 2 to recover to room temperature more quickly and without being affected by condensation. However, due to the rising temperature, the air pressure inside the inner sleeve 2 will rise rapidly, potentially damaging the probe 32 of the detection probe 3. Therefore, the device is connected to the inner tube connector 21 before the inner sleeve 2 is taken out from the outer sleeve 1. The inner sleeve 2 is connected to the inner tube connector 21, which reduces the rate and magnitude of the increase in air pressure in the inner sleeve 2. This can prevent the air pressure in the inner sleeve 2 from rising sharply and allow the detection rod 3 to quickly recover in the refrigerant environment. After the set time is maintained, the detection rod 3 returns to room temperature. After the detection rod 3 returns to room temperature, the refrigerant in the inner sleeve 2 is evacuated through the inner tube connector 21 to prevent the refrigerant in the inner sleeve 2 from flowing into the air and causing environmental pollution after the sealing cover 4 is removed.

[0085] It should be noted that after removing the inner sleeve 2, a sealing plug should be used to seal the outer pipe joint 11 to prevent a large amount of condensation from forming on the inner wall of the outer sleeve 1.

[0086] Example 4

[0087] like Figure 1 , Figure 2 and Figure 5 As shown, this embodiment provides a temperature control method for a double-layer structure of a low-temperature Dewar as described in Embodiment 1. The specific steps include:

[0088] S1. The temperature measuring element collects temperature information at the sample location and transmits the temperature information to the temperature control component;

[0089] S2. Compare the temperature information with the set temperature and determine whether the temperature information deviates from the set temperature. If so, proceed to step S3.

[0090] S3. The temperature control component generates a control signal and outputs it to the heating component to control the operation of the heating component.

[0091] After the temperature measuring element collects the temperature information inside the inner sleeve 2 in real time, it transmits the temperature information to the temperature control component. The temperature control component compares the temperature information with the set temperature and determines whether the temperature information deviates from the set temperature. If it deviates, the temperature control component generates a control signal based on the temperature information and the set temperature and outputs it to the heating component to control the heating component to work. The heating component, located at the bottom of the inner sleeve 2, heats the inside of the inner sleeve 2 to ensure that the temperature at the sample location is at the set temperature. It can be understood that the set temperature is the test temperature zone. By controlling the heating component, the temperature at the sample location is kept constant, avoiding temperature fluctuations from affecting the test conditions and the detection results of the detection probe 3. Furthermore, due to the convection effect of the refrigerant, the influence of temperature gradients can be effectively eliminated. In this embodiment, the temperature measuring element is set on the probe 32 of the detection probe 3 to accurately collect the temperature at the sample location set on the probe 32.

[0092] Specifically, the temperature control component also includes a host computer, which is used to set the set temperature.

[0093] In this embodiment, the inner sleeve 2 is made of a thermally conductive material. The heating component is located at the bottom of the inner sleeve 2, which is made of a thermally conductive material. This allows the heat generated by the heating component to be transferred through the inner sleeve 2 and the refrigerant inside it, thus keeping the temperature at the sample location constant. Furthermore, due to the convection effect of the refrigerant, the influence of temperature gradients can be effectively eliminated, ensuring that the temperature in different areas is the same and there are no differences, resulting in more accurate test results.

[0094] For example, the inner sleeve 2 is made of metals such as copper, aluminum, or iron. It is understood that any material with good thermal conductivity can be used to make the inner sleeve 2 in this embodiment, and this embodiment does not limit it.

[0095] Since the inner sleeve 2 is made of thermally conductive material, the temperature change of the refrigerant in the outer sleeve 1 will also be transferred to the refrigerant in the inner sleeve 2 through the inner sleeve 2, thus affecting the temperature at the sample location. Furthermore, when the heating component heats the refrigerant in the inner sleeve 2, the heat will also be transferred to the refrigerant in the outer sleeve 1. Therefore, if the operation of the heating component is controlled solely by the temperature information in the inner sleeve 2, the interference from the refrigerant in the outer sleeve 1 will cause the heated temperature to still deviate from the set temperature, requiring multiple adjustments and resulting in low temperature control efficiency.

[0096] To address the aforementioned issues, in step S3, the temperature control component generates a control signal based on temperature information and the collected air pressure information within the outer sleeve 1. Since the outer sleeve 1 is sealed, its air pressure information indirectly reflects the temperature information within it. The temperature control component combines the temperature information within the inner sleeve 2 and the air pressure information within the outer sleeve 1 to generate the control signal, thereby controlling the heating of the heating component. By combining temperature and air pressure information, the impact of refrigerant temperature fluctuations within the outer sleeve 1 on the temperature at the sample location is reduced, thus improving temperature control efficiency.

[0097] Specifically, in step S3 above, the main controller of the temperature control component generates an intermediate variable based on the temperature information, and the secondary controller of the temperature control component adjusts the intermediate variable based on the air pressure information to generate a control signal. After the temperature sensor collects the temperature information, it transmits it to the main controller. The main controller outputs the intermediate variable to the secondary controller based on the temperature information and the set temperature. The secondary controller generates a control signal based on the air pressure information and the intermediate variable to control the heating of the heating component. Through this two-layer control, the tracking capability of the set temperature can be enhanced while maintaining system stability. The main controller ensures the overall stability of temperature regulation, while the secondary controller adjusts the intermediate variable based on the air pressure information inside the outer casing 1 to achieve precise temperature control.

[0098] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A double-layer structure for a cryogenic dewar, characterized by, include: The outer tube (1) is provided with an outer tube joint (11), the outer tube joint (11) is at least partially located outside the low temperature Dewar (100), and the outer tube joint (11) is sealed to the low temperature Dewar (100) so that the outer tube (1) is sealed inside the low temperature Dewar (100); Inner sleeve (2), inner sleeve (2) is provided with inner tube connector (21), detection rod (3) is at least partially inserted into the inner sleeve (2), the detection rod (3) is used to detect the sample, the inner sleeve (2) is inserted into the outer sleeve (1), and the inner tube connector (21) is detachably connected to the outer tube connector (11), and refrigerant is placed in both the outer sleeve (1) and the inner sleeve (2); A sealing cover (4) is provided at the top of the inner sleeve (2).

2. Double-layer structure for cryogenic dewars according to claim 1, characterized in that, The double-layer structure for low-temperature Dewar also includes a temperature control unit, which comprises: A heating assembly is disposed at the bottom of the inner sleeve (2); Temperature measuring element, the temperature measuring element is set on the detection plug (3), the temperature measuring element is used to collect temperature information inside the inner sleeve (2); A temperature control component, which is communicatively connected to both the heating component and the temperature measuring element.

3. Double-layer structure for cryogenic dewars according to claim 2, characterized in that, The temperature control unit also includes a pressure measuring element, which is used to collect the air pressure inside the outer tube (1) and is communicatively connected to the temperature control component.

4. Double-layer structure for cryogenic dewars according to claim 3, characterized in that, The temperature control component includes a main controller and a secondary controller that are connected by communication. The main controller is connected to the temperature measuring element, and the secondary controller is connected to the pressure measuring element and the heating component.

5. A method of assembling a double-layer structure for a cryogenic vessel as claimed in any one of claims 1 to 4, characterized in that, include: S1. Insert the outer sleeve (1) into the low-temperature Dewar (100) and fix the two together. S2. Insert the detection rod (3) into the inner sleeve (2), install the sealing cover (4) on the top of the inner sleeve (2), and seal the lead wire (31) terminal (311) of the detection rod (3) through the wiring hole (41) of the inner sleeve (2). S3. Vacuum the inner sleeve (2) through the inner tube connector (21), insert the inner sleeve (2) into the outer sleeve (1) and fix the two together, and vacuum the outer sleeve (1) through the outer tube connector (11). S4. Refrigerant is introduced into the inner sleeve (2) through the inner pipe joint (21), and refrigerant is introduced into the outer sleeve (1) through the outer pipe joint (11).

6. A method of assembling a double-layer structure for a cryogenic dewar according to claim 5, characterized in that, The detection rod (3) is fixed with an installation part (5). After the detection rod (3) is inserted into the inner sleeve (2), the installation part (5) is fixedly connected to the inner tube joint (21).

7. A method of disassembling a double-layer structure for a cryogenic vessel as claimed in any one of claims 1 to 4, characterized in that, include: S1. Evacuate the refrigerant inside the outer casing (1) through the outer pipe joint (11); S2. Disassemble the inner sleeve (2) from the outer sleeve (1); S3. Connect the air extraction pipe to the inner pipe joint (21), remove the inner sleeve (2) from the outer sleeve (1) and keep it for a set time; S4. Evacuate the refrigerant in the inner sleeve (2) through the inner tube joint (21), disassemble the sealing cover (4), and take out the detection rod (3) from the inner sleeve (2).

8. A method for temperature control of a double-layer structure for a cryogenic dewar as claimed in any one of claims 2 to 4, characterized in that, include: S1. The temperature measuring element collects temperature information at the sample location and transmits the temperature information to the temperature control component; S2. Compare the temperature information with the set temperature and determine whether the temperature information deviates from the set temperature. If so, proceed to step S3. S3. The temperature control component generates a control signal and outputs it to the heating component to control the operation of the heating component.

9. A method of temperature control of a double-layer structure for a cryogenic dewar according to claim 8, characterized in that, The inner sleeve (2) is made of a thermally conductive material.

10. The temperature control method for a double-layer structure of a low-temperature Dewar according to claim 9, characterized in that, In step S3, the temperature control component generates the control signal based on the temperature information and the collected air pressure information inside the outer jacket (1).

11. The temperature control method for a double-layer structure of a low-temperature Dewar according to claim 10, characterized in that, In step S3, the main controller of the temperature control component generates an intermediate variable based on the temperature information, and the secondary controller of the temperature control component adjusts the intermediate variable based on the air pressure information to generate the control signal.

Images