A sample mounting device for enhanced cooling

Abstract

The present invention discloses a sample mounting device with enhanced cooling, including a sample rod and a sample cavity, wherein the sample rod and the sample cavity are connected and fixed by a sample rod flange and a sample rod mounting flange; the sample rod includes a fixing block, a compression spring, a flexible cooling chain and a conical cooling pressure block, which are used in conjunction with the conical cooling block of the sample cavity to achieve low temperature difference transmission of cooling from the sample cavity to the sample plate. The present invention adopts a sample cavity and a matching sample rod with flexible matching and compaction of solid cooling, which can meet the large cooling demand of the sample and the high vacuum measurement environment demand.

Description

Technical Field

[0001] The present invention relates to a sample cavity cooling device in a cryostat, and in particular to a cryostat for measuring relevant property parameters of samples in a low temperature environment with large heat generation or high vacuum measurement requirements, and more specifically to a sample mounting device that uses a combination of solid cooling and gas cooling to enhance cooling. Background Art

[0002] In recent years, with the continuous development of advanced technology fields such as cryogenic optics, physical property measurement, and quantum, cryostats have higher requirements in sample measurement, especially the needs of large cooling capacity and high vacuum measurement.

[0003] At present, the common cryostat adopts a top-loading structure, using two solutions: dynamic gas and static gas. The sample replacement is convenient, but due to the low saturated vapor pressure and low thermal conductivity of the gas at low temperature, the amount of cold that can be effectively transferred to the sample position is quite small. In this regard, it is necessary to solve the problem of low cryogenic cooling capacity.

[0004] In addition, some samples need to be tested in a high vacuum environment, and a method other than cooling gas must be used to cool the samples. Current cryostats cannot meet the high vacuum measurement requirements well. Summary of the invention

[0005] Purpose of the invention: In view of the shortcomings and defects of the prior art, the present invention provides a sample mounting device with enhanced cooling, which adopts a flexible and compact solid-cooling sample cavity and a matching sample rod to meet the large cooling capacity requirements of the sample and the high vacuum measurement environment requirements.

[0006] Technical solution: A sample mounting device with enhanced cooling is characterized in that it includes a sample rod and a sample cavity, wherein the sample rod and the sample cavity are connected and fixed via a sample rod flange and a sample rod mounting flange; the sample rod includes a fixing block, a compression spring, a flexible cooling chain and a conical cooling pressure block, which are used together with the conical cooling block of the sample cavity to achieve low temperature difference transfer of cooling from the sample cavity to the sample plate.

[0007] The sample chamber comprises an inner cylinder, an outer cylinder, a bottom cylinder and a sample chamber upper flange, which constitute a sample chamber inner cavity for installing a sample rod and a sample chamber interlayer for circulating cooling gas.

[0008] The conical cooling block is installed on the fixed block through a compression spring. When the sample rod and the sample cavity are installed, the compression spring is compressed to press the conical cooling block tightly onto the conical cooling block, thereby realizing the transfer of heat from the sample cavity to the sample rod.

[0009] Among them, the sample plate is connected with the conical cold-conducting pressure block through a flexible cold-conducting chain, a heat-conducting insulating gasket, so as to realize sample cooling and insulation; the low-temperature cooling gas flows in from the low-temperature working medium inlet, cools the sample cavity through the heat exchanger, flows through the sample cavity interlayer, and flows out from the sample cavity interlayer gas interface, and is isolated from the inner cavity of the sample cavity.

[0010] Among them, the conical cold-conducting pressure block of the sample rod is installed on the fixed block through a compression spring, the sample plate and the conical cold-conducting pressure block are concentrically arranged on the fixed block, and the sample plate and the conical cold-conducting pressure block are thermally coupled through a flexible cold-conducting chain.

[0011] Among them, a thermometer and a heater are arranged on the sample plate, a heat-conducting insulating gasket is arranged at the connection between the conical cold-conducting pressing block and the flexible cold-conducting chain, and an insulating gasket is arranged between the conical cold-conducting pressing block and the sample plate.

[0012] The fixing block is connected to the sample rod flange through the upper section of the sample rod, the upper section of the sample rod is provided with a plurality of heat radiation screens, and the sample rod flange is provided with a vacuum electric penetration.

[0013] The sample cavity inner cavity and the sample cavity interlayer of the sample cavity are airtightly isolated and independent of each other, and a sample rod mounting flange is provided at the upper end of the sample cavity, which is a mounting and fixing position for the sample rod.

[0014] Among them, the heat exchanger of the bottom tube of the sample chamber, the conical cooling block, and the sample space tube are thermally coupled to the bottom flange, and the heat exchanger is replaced by a winding tube structure or a flow channel heat exchanger structure or other equivalent heat transfer methods.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the sample installation device for enhanced cooling of the present invention adopts a flexible and compact solid cooling sample cavity and a matching sample rod, and replaces the traditional low-temperature gas cooling through a conical cooling block with a flexible cold chain-conical cooling block, which is compacted with a compression spring to achieve heat transfer, and has the advantages of small cooling temperature difference and no need to use cooling gas. It can meet the large cooling capacity requirements of samples and the requirements of high vacuum measurement environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 is a schematic structural diagram of a sample rod of the present invention;

[0018] Figure 3 It is a schematic diagram of the local structure of the sample rod of the present invention;

[0019] Figure 4 is a schematic diagram of the three-dimensional structure of the sample rod of the present invention;

[0020] Figure 5It is a schematic diagram of the structure of the sample chamber of the present invention;

[0021] Figure 6 It is a structural schematic diagram of the bottom tube of the present invention;

[0022] Figure 7 It is a three-dimensional structural schematic diagram of the bottom tube of the present invention;

[0023] In the figure, 1 is the sample rod, 2 is the sample cavity, 3 is the sample rod flange, 4 is the vacuum electric penetration, 5 is the upper section of the sample rod, 6 is the thermal radiation screen, 7 is the fixing block, 8 is the compression spring, 9 is the thermal conductive insulating gasket, 10 is the insulating gasket, 11 is the conical cold-conducting pressure block, 12 is the flexible cold-conducting chain, 13 is the sample plate, 14 is the thermometer, 15 is the sample rod mounting flange, 16 is the inner cylinder, 17 is the outer cylinder, 18 is the sample cavity interlayer, 19 is the sample cavity upper flange, 20 is the sample cavity inner cavity, 21 is the bottom cylinder, 22 is the low-temperature working medium inlet, 23 is the heat exchanger, 24 is the conical cold-conducting block, 25 is the sample space cylinder, 26 is the bottom flange, and 27 is the heater. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0025] A sample mounting device for enhanced cooling of the present invention:

[0026] As attached Figure 1 The sample mounting device for enhanced cooling comprises a sample rod 1 and a sample cavity 2, which are connected and fixed by corresponding sample rod flanges 3 and sample rod mounting flanges 15. The sample rod flanges 3 and sample rod mounting flanges 15 can be fixed and sealed by KF flanges or flat flanges with O-rings of corresponding specifications.

[0027] As attached Figure 2:The sample rod 1 includes a sample rod flange 3, a vacuum electric penetration 4, a sample rod upper section 5, a thermal radiation screen 6, a fixed block 7, a compression spring 8, a flexible cold-conducting chain 12, a conical cold-conducting pressure block 11, a thermally conductive insulating gasket 9, an insulating gasket 10, a sample plate 13, a thermometer 14, and a heater 27. Among them, the fixed block 7 should be made of a material with high strength and not easy to deform at low temperature, the compression spring 8 should be selected from a model suitable for low temperature and with an appropriate elastic coefficient, the flexible cold-conducting chain 12 should be made of a material with excellent low-temperature flexibility and excellent thermal conductivity, the conical cold-conducting pressure block 11 should be made of a material with excellent low-temperature thermal conductivity, and the thermally conductive insulating gasket 9 should be made of a material with excellent thermal conductivity and excellent insulation performance at low temperature. Specifically, the conical cold-conducting pressure block 11 is installed on the fixed block 7 through the compression spring 8, and the sample plate 13 is arranged concentrically with the conical cold-conducting pressure block 11 and is also installed on the fixed block 7. The sample plate 13 and the conical cold-conducting pressure block 11 are thermally coupled through the flexible cold-conducting chain 12. The sample plate 13 is provided with a thermometer 14 and a heater 27. A heat-conducting insulating block 9 is provided at the connection between the flexible cold-conducting chain 12 and the conical cold-conducting pressing block 11, and an insulating block 10 is provided between the sample plate 13 and the conical cold-conducting pressing block 11. The fixing block 7 is connected to the sample rod flange 3 through the sample rod upper section 5, and a plurality of heat radiation screens 6 are provided on the sample rod upper section 5, and a vacuum electric penetration 4 is provided on the sample rod flange 3. The sample rod upper section 5 should be made of a material with excellent thermal insulation performance, and the vacuum electric penetration 4 can be used for the thermometer 14, the heater 27 and other necessary lead connections. In the case where no insulation is required, the insulating thermally conductive gasket 9 and the insulating gasket 10 can be removed.

[0028] As attached Figure 3 : The sample chamber 2 includes a sample rod mounting flange 15, a sample chamber inner cavity 20 gas interface, a sample chamber interlayer 18 gas interface, a cryogenic medium inlet 22, a sample chamber upper flange 19, an inner cylinder 16, an outer cylinder 17, a bottom cylinder 21, a sample chamber inner cavity 20 and a sample chamber interlayer 18. The inner and outer cylinders must be made of insulating materials, such as thin-walled stainless steel pipes, and the bottom cylinder 21 must be made of materials with excellent low-temperature thermal conductivity. Specifically, the inner cylinder 16, the outer cylinder 17, the bottom cylinder 21, and the upper flange 19 together constitute the sample chamber inner cavity 20 and the sample chamber interlayer 18, and the sample chamber inner cavity 20 is airtightly isolated from the sample chamber interlayer 18 and is independent of each other. A sample rod mounting flange 15 is provided at the upper end of the sample chamber 2, which is a fixed position for installing the sample rod 1.

[0029] As attached Figure 4 The bottom tube 21 includes a conical cooling block 24, a heat exchanger 23, a bottom flange 26 and a sample space tube 25. The conical cooling block 24, the heat exchanger 23 and the sample space tube 25 are thermally coupled to the bottom flange 26. The conical cooling block 24 and the conical cooling pressing block 11 on the sample rod 1 should be made of different materials with excellent low-temperature thermal conductivity to avoid cold welding, and the mating surfaces should have the same taper to ensure the heat conduction effect.

[0030] Effect analysis: The conical cold-conducting pressure block 11 is installed on the fixed block 7 through the compression spring 8. When the sample rod 1 and the sample cavity 2 are installed, the compression spring 8 is compressed to press the conical cold-conducting pressure block 11 against the conical cold-conducting block 24, so as to realize the heat transfer from the sample cavity 2 to the sample rod 1. The sample plate 13 is connected to the conical cold-conducting pressure block 11 through the flexible cold-conducting chain 12 and the heat-conducting insulating gasket 9 to realize sample cooling and insulation; the low-temperature cooling gas flows in from the low-temperature working medium inlet 22, cools the sample cavity 2 through the heat exchanger 23, flows through the sample cavity interlayer 18, flows out from the gas interface of the sample cavity interlayer 18, and is isolated from the inner cavity 20 of the sample cavity. The sample installation device for enhanced cold-conducting of the present invention adopts a sample cavity 2 and a matching sample rod 1 that are flexible and compacted to compact solid cold-conducting, and is compacted by the conical cold-conducting pressure block 11-conical cold-conducting block 24 with a flexible cold chain, in cooperation with the compression spring 8, to replace the traditional low-temperature gas cold-conducting, to realize heat transfer, and has the advantages of small temperature difference of cold-conducting and no need to use cold-conducting gas. It can meet the large cooling capacity requirements of samples and the high vacuum measurement environment requirements.

Claims

1. A sample mounting device with enhanced cooling, characterized in that: The invention comprises a sample rod (1) and a sample chamber (2), wherein the sample rod (1) and the sample chamber (2) are connected and fixed via a sample rod flange (3) and a sample rod mounting flange (15); the sample rod (1) comprises a fixing block (7), a compression spring (8), a flexible cold guide chain (12) and a conical cold guide pressure block (11), which are used in conjunction with a conical cold guide block (24) of the sample chamber (2) to achieve low temperature difference transmission of cold from the sample chamber (2) to the sample plate (13); the sample chamber (2) comprises an inner cylinder (16), an outer cylinder (17), a bottom cylinder (21) and a sample chamber upper flange (19), constituting a sample chamber inner cavity (20) for mounting the sample rod (1) and a sample chamber inner cavity (21) for circulating cold supply. The sample chamber interlayer (18) is provided with a gas flow; the conical cold-conducting pressure block (11) is installed on the fixed block (7) through a compression spring (8); when the sample rod (1) and the sample chamber (2) are installed, the compression spring (8) is compressed to press the conical cold-conducting pressure block (11) against the conical cold-conducting block (24), thereby realizing the heat transfer from the sample chamber (2) to the sample rod (1); the sample plate (13) is connected to the conical cold-conducting pressure block (11) through a flexible cold-conducting chain (12) and a heat-conducting insulating gasket (9), thereby realizing the cooling and insulation of the sample; the low-temperature cooling gas flows in from the low-temperature working medium inlet (22), cools the sample chamber (2) through the heat exchanger (23), flows through the sample chamber interlayer (18), and is cooled by the sample The gas interface of the cavity interlayer (18) flows out and is isolated from the inner cavity (20) of the sample cavity; the conical cold-conducting pressure block (11) of the sample rod (1) is installed on the fixed block (7) through a compression spring (8); the sample plate (13) and the conical cold-conducting pressure block (11) are concentrically arranged on the fixed block (7); the sample plate (13) and the conical cold-conducting pressure block (11) are thermally coupled through a flexible cold-conducting chain (12); a thermometer (14) and a heater (27) are arranged on the sample plate (13); a heat-conducting insulating gasket (9) is arranged at the connection between the conical cold-conducting pressure block (11) and the flexible cold-conducting chain (12); and an insulating gasket (10) is arranged between the conical cold-conducting pressure block (11) and the sample plate (13); The fixing block (7) is connected to the sample rod flange (3) through the sample rod upper section (5), a plurality of heat radiation screens (6) are provided on the sample rod upper section (5), and a vacuum electric penetration (4) is provided on the sample rod flange (3); the sample chamber inner cavity (20) of the sample chamber (2) and the sample chamber interlayer (18) are airtightly isolated and independent of each other, and a sample rod mounting flange (15) is provided at the upper end of the sample chamber (2), which is the mounting and fixing position of the sample rod (1); the heat exchanger (23), the conical cooling block (24), and the sample space tube (25) of the bottom tube (21) of the sample chamber (2) are thermally coupled to the bottom flange (26), and the heat exchanger (23) adopts a winding tube structure or a flow channel heat exchanger structure.

Images