Low-temperature vacuum plug rod with isolation cavity and core component rewarming method

Abstract

The low-temperature vacuum inserting rod with an isolation cavity comprises an isolation cavity assembly and an inserting rod assembly; the isolation cavity assembly comprises a sealing assembly, a temperature recovery assembly, a suction flange and a vacuum valve, the sealing assembly is in sealing connection with the temperature recovery assembly, the temperature recovery assembly is in sealing connection with the vacuum valve, and the suction flange is connected with the temperature recovery assembly; the inserting rod assembly comprises a top end sealing plug, a feeder pipe and a bottom end sealing plug; the top end sealing plug and the bottom end sealing plug are respectively connected with two ends of the feeder pipe; the inserting rod assembly is located in the isolation cavity assembly and moves along the vertical direction of the isolation cavity assembly to an upper work position and a lower work position; when being in the upper work position and the lower work position, the top end sealing plug and the bottom end sealing plug respectively form a sealing structure with the sealing assembly. The application further discloses a core component temperature recovery method. The application has the advantages of not needing to be equipped with a heating temperature control loop, simplifying equipment, saving cost and fast temperature recovery.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of low-temperature equipment and measurement related technology, in particular to a low-temperature vacuum insertion rod with an isolation chamber. BACKGROUND

[0002] Low-temperature vacuum insertion rods are widely used to connect room-temperature measurement equipment and samples to be measured in a low-temperature environment, and are indispensable equipment in the field of low-temperature measurement, and are widely used in research such as superconductivity, quantum effects, and material science. Multiple signal lines are provided inside the insertion rod. In order to reduce heat leakage and prevent condensate from eroding, the insertion rod is usually operated in a vacuum state.

[0003] Due to the need to replace samples, low-temperature vacuum insertion rods need to be repeatedly implanted and separated from the low-temperature environment. During temperature change operations such as cooling or heating, condensate erosion is inevitable. In order to protect the samples to be measured and the associated low-temperature components, such as piezoelectric and optical elements, protective measures are essential. For insertion rods that are directly implanted into low-temperature liquids, such as patents CN 112316998 A and CN 106501561 A, an independent outer cylinder is generally added, so that the insertion rod is in the independent vacuum chamber of the outer cylinder.

[0004] However, for low-temperature thermostats that have integrated low-temperature vacuum sample chambers, especially the increasing number of low-temperature systems based on liquid-helium-free dry-type refrigerators today, such as patent CN 116007792 A, at this time, the insertion rod carrying an additional independent vacuum chamber will be difficult to apply due to heat exchange problems. Currently, whether it is a commercially mature low-temperature system or a custom low-temperature device, the insertion rod generally carries a naked sample and a low-temperature component directly implanted into the sample chamber. After the measurement is completed, the sample area of the sample chamber is heated to room temperature, and the insertion rod is removed.

[0005] The main problems are as follows: first, the cooling or heating time is long. Second, it is difficult to apply to measurements that carry larger low-temperature components, such as scanning probe microscopes that need to carry complex piezoelectric and test units. Excessive heating power may cause the overall temperature of the low-temperature system to rise. Third, and more fatally, the sample chamber is locally heated, and the insertion rod is still rapidly cooled by the low-temperature area of the sample chamber during implantation or removal, and condensate erosion cannot be completely avoided. Alternatively, the insertion rod is equipped with a one-dimensional bellows linear actuator, which completely separates the insertion rod from the sample chamber and completely places it in the bellows for temperature rise. The disadvantage is that a long and bulky bellows linear actuator needs to be provided, and the operation is complex. More importantly, the low-temperature insertion rod is generally long, and the bellows linear actuator needs a large stroke, which greatly increases the space occupation.

[0006] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be regarded as an acknowledgment or any form of suggestion that it forms prior art of those skilled in the art. SUMMARY

[0007] The technical problem solved by the present application is how to solve the problems of inserting rod carrying exposed samples and low-temperature components directly implanting or separating from the sample cavity, and condensate erosion.

[0008] The present application solves the above technical problems by the following technical means:

[0009] The low-temperature vacuum inserting rod with an isolation cavity comprises an isolation cavity assembly and an inserting rod assembly.

[0010] The isolation cavity assembly comprises a sealing assembly, a temperature recovery assembly, a suction flange, and a vacuum valve, the sealing assembly is sealingly connected with the temperature recovery assembly, the temperature recovery assembly is sealingly connected with the vacuum valve, and the suction flange is connected with the temperature recovery assembly; the inserting rod assembly comprises a top-end sealing plug, a feed line tube, and a bottom-end sealing plug, the top-end sealing plug and the bottom-end sealing plug are respectively connected with two ends of the feed line tube.

[0011] The inserting rod assembly is located in the isolation cavity assembly and moves along the vertical direction of the isolation cavity assembly to an upper working position and a lower working position, and the top-end sealing plug and the bottom-end sealing plug form a sealing structure with the sealing assembly at the upper working position and the lower working position.

[0012] Preferably, the bottom of the vacuum valve is sealingly connected with a sample cavity of a low-temperature system.

[0013] Preferably, the sealing assembly comprises a sealing cap, a sealing ring, and a sealing base, the bottom of the sealing cap is threadedly connected with the top of the sealing base, the top of the sealing cap extends inward to form an annular plate, the bottom surface of the annular plate and the inner wall of the sealing cap and the top end of the sealing base form a containing groove, and the sealing ring is arranged in the containing groove.

[0014] Preferably, the sealing assembly further comprises a sealing compression ring, the sealing compression ring is arranged in the containing groove, the sealing compression ring is in a cylindrical shape, the top end of the sealing compression ring extends inward horizontally to form a compression ring, and the sealing ring is arranged in the sealing compression ring.

[0015] The sealing ring can be adaptively adjusted in compression degree by screwing the sealing cap and the sealing base.

[0016] Preferably, the inserting rod assembly further comprises an adapter flange and a low-temperature test component, the adapter flange is connected with the top of the top-end sealing plug, the adapter flange, the top-end sealing plug, and the feed line tube are in vacuum communication with each other, and the low-temperature test component is connected with the bottom end of the feed line tube and located below the bottom-end sealing plug.

[0017] Preferably, the inserting rod assembly further comprises a radiation shield connected to the feeder pipe, and the radiation shield is located between the top end sealing plug and the bottom end sealing plug.

[0018] Preferably, the radiation shield comprises a plurality of radiation shield parts, and the plurality of radiation shield parts are uniformly arranged along the axial direction of the feeder pipe.

[0019] Preferably, the radiation shield comprises a plurality of radiation shield parts, and the plurality of radiation shield parts are uniformly arranged along the axial direction of the feeder pipe.

[0020] The application further discloses a core component rewarming method, which is implemented by using the low-temperature vacuum inserting rod with an isolation cavity.

[0021] During implantation of the sample and the core component into the sample cavity, the sealing assembly is in a free state, the vacuum valve is opened, and the inserting rod assembly is slowly implanted into the sample cavity.

[0022] During extraction of the sample and the core component from the sample cavity, the vacuum valve is closed, the gas supply of the suction flange is stopped, and the suction flange is sealed.

[0023] Preferably, the flushing mode of the sample cavity by the suction flange is as follows: the sample cavity is vacuumized, and then filled with exchange gas, and the above process is repeated three times to realize flushing of the sample cavity.

[0024] The application has the following advantages:

[0025] In the application, after the inserting rod assembly is extracted, the sample and the low-temperature test component are placed in the isolation cavity assembly for isolation and rewarming, so that the condensate is prevented from corroding; the sample cavity does not need to be heated, and the low-temperature system has no rewarming risk; no heating and temperature control circuit is needed, so that the equipment is simplified, the cost is saved, and the rewarming is fast.

[0026] The large-volume low-temperature test system is heated to 300K in a low-temperature environment and then taken out. This rewarming mode requires a large power. For a wet magnet, it results in a large loss of liquid helium, and for a dry magnet, it is more fatal, which can cause the whole low-temperature system to be rewarming. The patent only needs to place the test system in the rewarming cavity for rewarming, and there is no above problem, so the application is more suitable for applications carrying large-volume low-temperature measurement systems.

[0027] The operator can directly take out the insertion rod with low-temperature gloves, or mechanically take out the insertion rod by using a sling, compared with a corrugated pipe linear driver scheme, which greatly saves space and simplifies operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structure schematic view of a low-temperature vacuum insertion rod with an isolation cavity according to an embodiment of the application;

[0029] Figure 2 is a sectional view of the low-temperature vacuum insertion rod with the isolation cavity according to the embodiment of the application;

[0030] Figure 3 is Figure 2 is an enlarged view of A in FIG. 6;

[0031] Figure 4 is a structure schematic view of the low-temperature vacuum insertion rod in an implantation process according to the embodiment of the application;

[0032] Figure 5 is a structure schematic view of the low-temperature vacuum insertion rod in a rewarming process according to the embodiment of the application;

[0033] Figure 6 is a structure schematic view of a radiation protection screen according to an embodiment of the application;

[0034] Figure 7 is a structure schematic view of a radiation protection screen according to an embodiment of the application;

[0035] Reference numerals in the drawings:

[0036] 1, isolation cavity assembly; 11, sealing cap; 12, sealing compression ring; 13, sealing ring; 14, sealing base; 15, suction port flange; 16, rewarming cavity; 17, vacuum valve;

[0037] 2, insertion rod assembly; 21, adapter flange; 22, top end sealing plug; 23, feed line tube; 24, radiation protection screen; 25, bottom end sealing plug; 26, low-temperature test component. DETAILED DESCRIPTION

[0038] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0039] Embodiment one:

[0040] As shown in the drawings, the low-temperature vacuum insertion rod with an isolation chamber comprises an isolation chamber assembly 1 and an insertion rod assembly 2; the insertion rod assembly 2 is located in the isolation chamber assembly 1 and moves vertically along the isolation chamber assembly 1 to an upper work position (1) and a lower work position (2); when in the upper work position and the lower work position, the insertion rod assembly 2 and the isolation chamber assembly 1 can form a sealed structure. Figure 1 Figure 2 The isolation chamber assembly 1 comprises a sealing assembly, a temperature recovery assembly, a suction flange 15 and a vacuum valve 17; the sealing assembly is sealingly connected with the temperature recovery assembly; the temperature recovery assembly is connected with the vacuum valve; the suction flange is connected with the temperature recovery assembly; the sealing assembly comprises a sealing cap 11, a sealing compression ring 12, a sealing ring 13 and a sealing base 14; the temperature recovery assembly is a temperature recovery cavity 16; the sealing cap 11, the sealing compression ring 12, the sealing ring 13, the sealing base 14, the suction flange 15, the temperature recovery cavity 16 and the vacuum valve 17 are coaxially installed from top to bottom. Figure 5 The entire insertion rod system is sealingly connected with the flange of the sample chamber of the low-temperature system through the lower flange of the vacuum valve 17.

[0041] As shown in the drawings, the sealing cap 11 is a cylindrical structure as a whole, the top end of which extends inwardly to form an annular plate, the inner surface of the bottom of the sealing cap 11 has internal threads, the outer surface of the top end of the sealing base 14 has external threads, the sealing cap 11 is screwed on the top end of the sealing base 14, the bottom surface of the annular plate and the inner wall of the sealing cap and the top end of the sealing base form a containing groove, the annular plate of the sealing cap 11 can extrude the sealing compression ring 12 thereunder during the screwing of the threads, and then extrude the sealing ring 13 to deform.

[0042] The sealing compression ring 12 is cylindrical, the top end of which extends horizontally inwardly to form a compression ring, the sealing ring 14 is placed in the sealing compression ring 12, the internal threads of the sealing cap 11 and the external threads of the sealing base 14 are engaged, the sealing cap 11 is rotated to realize the axial displacement of the sealing cap 11 to extrude the sealing compression ring 12, and further extrude the sealing ring 13 to deform the sealing ring 13.

[0043] Figure 2 The sealing compression ring 12 is cylindrical, the top end of which extends horizontally inwardly to form a compression ring, the sealing ring 14 is placed in the sealing compression ring 12, the internal threads of the sealing cap 11 and the external threads of the sealing base 14 are engaged, the sealing cap 11 is rotated to realize the axial displacement of the sealing cap 11 to extrude the sealing compression ring 12, and further extrude the sealing ring 13 to deform the sealing ring 13. Figure 3 The sealing compression ring 12 is cylindrical, the top end of which extends horizontally inwardly to form a compression ring, the sealing ring 14 is placed in the sealing compression ring 12, the internal threads of the sealing cap 11 and the external threads of the sealing base 14 are engaged, the sealing cap 11 is rotated to realize the axial displacement of the sealing cap 11 to extrude the sealing compression ring 12, and further extrude the sealing ring 13 to deform the sealing ring 13.

[0044] The sealing compression ring 12 is cylindrical, the top end of which extends horizontally inwardly to form a compression ring, the sealing ring 14 is placed in the sealing compression ring 12, the internal threads of the sealing cap 11 and the external threads of the sealing base 14 are engaged, the sealing cap 11 is rotated to realize the axial displacement of the sealing cap 11 to extrude the sealing compression ring 12, and further extrude the sealing ring 13 to deform the sealing ring 13.​​

[0045] The bottom end of the sealing base 14 is sealingly connected to the top of the re-warming cavity 16, and the sealing connection can be achieved by a sealing member or welding. The lower flange of the re-warming cavity 16 is sealingly connected to the upper flange of the vacuum valve 17.

[0046] The end of the pumping flange 15 is sealingly connected to the sealing base 14. The pumping flange 15 can be used to fill the isolation cavity with protective gas or to pump the isolation cavity.

[0047] As shown in Figure 2 , the plug rod assembly 2 includes an adapter flange 21, a top end sealing plug 22, a feed line tube 23, a radiation shielding screen 24, a bottom end sealing plug 25, and a low temperature testing component 26. The adapter flange 21, the top end sealing plug 22, the feed line tube 23, the radiation shielding screen 24, the bottom end sealing plug 25, and the low temperature testing component 26 are connected in an axial direction from top to bottom.

[0048] Specifically, the bottom end of the adapter flange 21 is fixedly connected to the top end of the top end sealing plug 22, the feed line tube 23 is fixedly connected to the bottom end of the top end sealing plug 22, and the top end sealing plug 22 is penetrated in the middle, so that the interiors of the adapter flange 21, the top end sealing plug 22, and the feed line tube 23 are communicated with each other. The radiation shielding screen 24 is fixedly arranged on the feed line tube 23 in a coaxial manner, the bottom end sealing plug 25 is fixedly arranged on the feed line tube 23 in a coaxial manner, and the low temperature testing component 26 is fixedly arranged at the bottom of the feed line tube 23.

[0049] The adapter flange 21 is used to connect an external testing system. The feed line tube 23 is used to connect various testing cables and the low temperature testing component 26.

[0050] The top end sealing plug 22 and the bottom end sealing plug 25 can be sealingly connected to or disconnected from the sealing ring 13 when the top end sealing plug 22 and the bottom end sealing plug 25 are in the upper station and the lower station, respectively.

[0051] In this embodiment, the radiation shielding screen 24 can be made of epoxy resin and can be designed as a multi-segment ring structure and fixedly arranged on the feed line tube 23 in a seamless manner from top to bottom. The outer diameter of the radiation shielding screen 24 is slightly smaller than the inner diameter of the sealing ring 25, so that the protective gas is sprayed out through the narrow gap between the radiation shielding screen 24 and the sealing ring 25, and air is prevented from entering the sample cavity.

[0052] The isolation cavity assembly 1 and the plug rod assembly 2 are fixedly connected to the sample cavity flange of the low temperature system through the vacuum valve 17, and the vacuum valve 17 is closed.

[0053] The implantation and removal of the plug rod assembly 2 will be described as follows:

[0054] During the implantation of the sample and the core component into the sample cavity, as shown in Figure 4 , the sealing ring 13 is in a free state (not compressed and deformed), the protective gas is introduced through the pumping flange 15, the vacuum valve 17 is opened, the plug rod assembly 2 is slowly implanted into the sample cavity, and the sealing ring 13 is compressed and deformed to be in close contact with the inner wall of the sample cavity. Figure 2As shown, after the insertion rod assembly 2 is completely implanted in the sample cavity, the sealing cap 11 is screwed, the compression sealing ring 13 is deformed by the sealing base 14, the compression sealing ring 13 tightly presses the top end sealing plug 22, and the vacuum sealing is completed. The sample cavity is flushed with exchange gas for more than three times through the exhaust flange 15. Specifically, the sample cavity is vacuumized, and then filled with exchange gas, and the cycle is repeated for three times to realize the flushing of the sample cavity. After the flushing is completed, the exchange gas is introduced to cool the sample, and finally the exhaust flange 15 is sealed.

[0055] In this embodiment, the protective gas and the exchanger are generally helium.

[0056] During the extraction process, the protective gas is introduced through the exhaust flange 15, the compression sealing ring 13 is restored to a free state by the displacement of the sealing cap 11 and the sealing base 14, the insertion rod assembly 2 is moved upward, and the bottom end sealing plug 25 is located in the area of the compression sealing ring 15. The compression sealing ring 14 is deformed by the compression of the sealing cap 11 and the sealing base 14, the compression sealing ring 14 tightly presses the bottom end sealing plug 25, and the vacuum sealing is completed. The vacuum valve 17 is closed, the gas supply of the exhaust flange 15 is stopped, and the exhaust flange 15 is sealed. The state is as shown in Figure 5 The sample and the low-temperature test component 26 are located in the isolation cavity assembly 1, and after being warmed to room temperature under the condition of exchange gas, the insertion rod assembly 2 is completely extracted.

[0057] In the above implantation and extraction process, the insertion rod assembly 2 is generally light, and can be extracted by a person wearing protective gloves, or can be extracted by a lifting sling. Or it can be a mechanism in the prior art that can realize vertical movement up and down, such as a motor, an air cylinder, etc.

[0058] In the above embodiment, the low-temperature vacuum insertion rod with an isolation cavity is adopted, after the insertion rod assembly 2 is extracted, the sample and the low-temperature test component 26 are both placed in the isolation cavity assembly 1 for isolation and warming, avoiding the erosion of condensate; without heating the sample cavity, the low-temperature system has no risk of warming; without equipping a heating and temperature control circuit, the equipment is simplified, the cost is saved, and the warming is fast; it is suitable for applications carrying large-volume low-temperature measurement systems; compared with the corrugated pipe linear driver scheme, the space is greatly saved, and the operation is simplified.

[0059] Embodiment two:

[0060] As shown in Figure 6 In this embodiment, the radiation shielding screen 24 includes a plurality of radiation shielding sub-bodies, and the plurality of radiation shielding sub-bodies are uniformly arranged along the axial direction of the feeder tube. The radiation shielding screen sub-body is a hollow cylindrical structure with an empty top end and a fixed connection between the bottom end and the feeder tube 23.

[0061] Embodiment three:

[0062] As shown in Figure 7As shown, in the embodiment, the radiation protection screen 24 can be designed as a thin sheet and is arranged on the feed line tube 23 continuously and in multiple. In this case, during the insertion or removal of the insertion rod, the ventilation volume needs to be increased to avoid air entering the sample cavity.

[0063] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cryogenic vacuum insertion rod with an isolation chamber, characterized in that The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve.

2. A cryogenic vacuum insertion rod with an isolation chamber according to claim 1, characterized in that The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve.

3. A cryogenic vacuum insertion rod with an isolation chamber according to claim 1, characterized in that The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve.

4. The cryogenic vacuum insertion rod with an isolation chamber according to claim 1, characterized in that, The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve.

5. A cryogenic vacuum insertion rod with an isolation chamber according to claim 4, characterized in that The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve.

6. A cryogenic vacuum insertion rod with an isolation chamber according to claim 4, characterized in that The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve.

7. A method of rewarming a core component, characterized by, The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. The isolation cavity assembly comprises a sealing assembly, a back-temperature assembly, a suction flange, and a vacuum valve. 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8. The core component tempering method according to claim 7, wherein The sample cavity is washed by the suction flange in the following way: the sample cavity is vacuumized, and then filled with exchange gas, and the cycle is repeated three times to realize the washing of the sample cavity.

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