Dilution refrigerator thermostat with light blocking assembly

Abstract

The invention provides a dilution refrigerator thermostat with a light blocking assembly, and particularly relates to the technical field of dilution refrigerators. The thermostat comprises a vacuum cover, and a cold disc, a first vacuum tube and a second vacuum tube which are arranged in an inner cavity of the vacuum cover, the inlet end of the first vacuum pipe is communicated with the gas path pipeline; the outlet end of the second vacuum pipe is communicated with the mixing chamber; a fixed flange is arranged at the outlet end of the first vacuum pipe; the first bolt hole of the fixed flange is fixedly connected with the cold disc through a bolt; a connecting flange is arranged at the inlet end of the second vacuum pipe and fixed to a second bolt hole in the bottom of the fixing flange through a screw. A light blocking assembly is arranged on the side, close to the outlet end, of an inner cavity of the first vacuum pipe. The light blocking assembly is arranged in the vacuum pipeline in the dilution refrigerator thermostat, electromagnetic wave radiation heat transfer in the vacuum pipeline is effectively isolated, and meanwhile it is guaranteed that flowing of 3He and 4He gas in the vacuum pipeline is not interfered.

Description

Technical Field

[0001] This invention patent relates to the field of dilution refrigeration technology, specifically to a dilution refrigeration thermostat with a light-blocking component. Background Technology

[0002] The cryogenic dilution refrigerator is a high-end scientific instrument capable of providing near-absolute zero temperature environments and is one of the key core devices in modern quantum science and quantum technology research. As a high-end scientific instrument, the dilution refrigerator utilizes the entropy increase of 3He atoms flowing from the dense phase through the phase interface into the dilute phase at extremely low temperatures to achieve continuous cooling in the mK temperature range. To obtain extremely low temperatures below 10 mK, the dilution refrigerator needs to minimize heat leakage and various heat transfers between the cold plates.

[0003] However, due to the temperature difference between the cold plates of the dilution refrigeration unit, the vacuum pipes connecting the cold plates will have the problem of electromagnetic heat transfer from the cold plate with a higher temperature to the cold plate with a lower temperature. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a dilution refrigerator thermostat with a light-blocking component, the specific technical solution of which is as follows: A thermostat for a dilution refrigeration unit with a light-blocking component includes a vacuum hood and a cold plate, a first vacuum tube, and a second vacuum tube disposed within the inner cavity of the vacuum hood. The inlet end of the first vacuum tube is connected to a gas pipeline; the outlet end of the second vacuum tube is connected to a mixing chamber; a fixed flange is provided at the outlet end of the first vacuum tube; the first bolt hole of the fixed flange is fixedly connected to the cold plate by bolts; a connecting flange is provided at the inlet end of the second vacuum tube, and the connecting flange is fixed to the second bolt hole at the bottom of the fixed flange by screws; a light-blocking component is provided on the inner cavity of the first vacuum tube near its outlet end.

[0005] Preferably, the light-blocking assembly includes a screw and a base flange; the base flange is disposed at the bottom of the screw; the screw is fitted with a first light-blocking plate, a second light-blocking plate and a third light-blocking plate from top to bottom, and each light-blocking plate is fixed to the screw at intervals by fixing nuts; the first light-blocking plate, the second light-blocking plate and the third light-blocking plate have the same structure and size.

[0006] Preferably, mounting holes are provided at the center of the first light-blocking sheet, the second light-blocking sheet, and the third light-blocking sheet.

[0007] Preferably, the inner diameter of the mounting hole is adapted to the outer diameter of the screw.

[0008] Preferably, the first light-blocking sheet, the second light-blocking sheet, and the third light-blocking sheet are all provided with fan-shaped airflow structures with an included angle of 90° along their circumference, and the three airflow structures are installed in a staggered manner between each other.

[0009] Preferably, the base flange is provided with a connecting seat corresponding to the position of the screw, and the bottom of the screw is threadedly connected to the connecting seat; the base flange is symmetrically provided with a plurality of air passage holes along the outer center of the connecting seat; the surface of the base flange is provided with a plurality of threaded holes at equal intervals along its circumference, avoiding the positions of the plurality of air passage holes.

[0010] Preferably, the fixed flange has a plurality of third bolt holes corresponding to the positions of the plurality of threaded holes, and the threaded holes of the base flange and the third bolt holes of the fixed flange are fixed together by screws.

[0011] More preferably, the second vacuum tube adopts a corrugated tube structure.

[0012] Furthermore, preferably, the base flange is made of stainless steel.

[0013] More preferably, the first light-blocking sheet, the second light-blocking sheet, and the third light-blocking sheet are made of aluminum alloy.

[0014] The beneficial effects of this invention are: This invention features a simple structure and is easy to install. It utilizes the airflow structure of the three light-blocking plates in the light-blocking assembly to allow for staggered installation between each pair. Combined with several airflow holes on the base flange, this achieves mutual axial blocking without interfering with the vacuum pipeline. 3 He and 4 The flow of He gas effectively isolates the transfer of electromagnetic radiation heat in the vacuum pipeline. Attached Figure Description

[0015] The accompanying drawings constituting this invention are provided to further understand this application and do not constitute an undue limitation of this application.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the internal vacuum pipeline section of the present invention; Figure 3 This is a schematic diagram of the light-blocking component. Figure 4 for Figure 3 Exploded view; Figure 5 for Figure 3 A sectional view; Figure 6 This is a structural diagram of the base flange; Figure 7 Here is a schematic diagram of the structure of each light-blocking plate; Figure 8 This is a structural diagram of a fixed flange; where, Figure 8(a) is the front view of the fixed flange; Figure 8 (b) is a bottom view of the fixed flange; In the diagram, 1-light-blocking assembly; 2-first light-blocking plate; 3-second light-blocking plate; 4-third light-blocking plate; 5-base flange; 501-airflow hole; 6-screw; 7-fixing nut; 8-vacuum shroud; 9-cold plate; 901-fixing flange; 9011-first bolt hole; 9012-second bolt hole; 9013-third bolt hole; 10-first vacuum tube; 11-second vacuum tube; 1101-connecting flange; 12-mounting hole; 13-airflow structure clearance. Detailed Implementation

[0017] The specific implementation of a dilution refrigeration thermostat with a light-blocking component provided by the present invention will be further described with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-2 , Figure 8 (a)- Figure 8 As shown in (b), a dilution refrigerator thermostat with a light-blocking component includes a vacuum hood 8 and a cold plate 9, a first vacuum tube 10, and a second vacuum tube 11 disposed within the inner cavity of the vacuum hood 8. The inlet end of the first vacuum tube 10 is connected to a gas pipeline; the outlet end of the second vacuum tube 11 is connected to a mixing chamber; a fixing flange 901 is provided at the outlet end of the first vacuum tube 10; the first bolt hole 9011 of the fixing flange 901 is fixedly connected to the cold plate 9 by bolts; a connecting flange 1101 is provided at the inlet end of the second vacuum tube 11, and the connecting flange 1101 is fixed to the second bolt hole 9012 at the bottom of the fixing flange 901 by screws; a light-blocking component 1 is disposed within the inner cavity of the first vacuum tube 10 near its outlet end.

[0019] like Figures 3-5 , Figure 7 As shown, the light-blocking assembly 1 includes a screw 6 and a base flange 5. Preferably, the base flange 5 is provided with a connecting seat corresponding to the position of the screw 6, and the bottom of the screw 6 is threadedly connected to the connecting seat of the base flange 5.

[0020] Preferably, the first light-blocking plate 2, the second light-blocking plate 3, and the third light-blocking plate 4 are all provided with mounting holes 12 at their center positions; the first light-blocking plate 2, the second light-blocking plate 3, and the third light-blocking plate 4 are sequentially sleeved on the surface of the screw rod 6 through the mounting holes 12 and fixed to the screw rod 6 at intervals by a number of fixing nuts 7.

[0021] It is worth noting that the inner diameter of the mounting hole 12 is compatible with the outer diameter of the screw 6; the structure and dimensions of the first light-blocking plate 2, the second light-blocking plate 3, and the third light-blocking plate 4 are all identical. During installation, the side containing each light-blocking plate faces the inlet end of the first vacuum tube 10.

[0022] To effectively isolate the heat transfer from electromagnetic radiation within the vacuum pipeline, while also ensuring the safety of the vacuum pipeline... 3 He and 4 The gas flow is undisturbed. The first light-blocking plate 2, the second light-blocking plate 3, and the third light-blocking plate 4 all have fan-shaped airflow clearance structures 13 with an included angle of 90° along their circumference. Additionally, the base flange 5 has several airflow holes 501 symmetrically arranged around the center of the connecting seat. Figure 6 As shown.

[0023] It is worth emphasizing here that during installation, the three airflow structures from top to bottom should be arranged in a staggered manner between each other.

[0024] Preferably, the base flange 5 has a plurality of threaded holes evenly spaced along its circumference, avoiding the positions of the plurality of air passage holes 501; the 1 has a plurality of third bolt holes 9013 corresponding to the positions of the plurality of threaded holes, and the threaded holes of the base flange 5 and the third bolt holes 9013 of the fixing flange 901 are fixed together by screws.

[0025] More preferably, the second vacuum tube 11 adopts a corrugated tube structure.

[0026] Furthermore, preferably, the base flange 5 is made of stainless steel.

[0027] More preferably, the first light-blocking sheet 2, the second light-blocking sheet 3, and the third light-blocking sheet 4 are made of aluminum alloy.

[0028] This invention achieves axial mutual shielding of the light-blocking plates and gas flow holes by installing a light-blocking assembly in the vacuum pipeline of the thermostat of the dilution refrigerator. The light-blocking plates are staggered on the screw rod by fixing nuts and connected to the fixed flange via the base flange. This does not affect the overall axial flow. 3 He and 4 The flow of He gas in the vacuum pipeline effectively isolates the transfer of electromagnetic radiation heat in the vacuum pipeline.

[0029] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are merely used to facilitate the description of the structural relationships of the various components or elements of this invention and do not specifically refer to any particular component or element in this invention, nor should they be construed as limiting the invention. Terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of the above terms in this invention based on the specific circumstances, and they should not be construed as limiting the invention.

[0030] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A thermostat for a dilution refrigeration unit with a light-blocking component, characterized in that, Includes a vacuum chamber and a cold plate, a first vacuum tube, and a second vacuum tube disposed inside the vacuum chamber. The inlet end of the first vacuum tube is connected to the gas pipeline; the outlet end of the second vacuum tube is connected to the mixing chamber; a fixed flange is provided at the outlet end of the first vacuum tube; the first bolt hole of the fixed flange is fixedly connected to the cold plate by bolts; a connecting flange is provided at the inlet end of the second vacuum tube, and the connecting flange is fixed to the second bolt hole at the bottom of the fixed flange by screws. A light-blocking component is provided on the side of the inner cavity of the first vacuum tube near its outlet end.

2. The thermostat for a dilution refrigerator with a light-blocking component according to claim 1, characterized in that, The light-blocking assembly includes a screw and a base flange; the base flange is located at the bottom of the screw; the screw is fitted with a first light-blocking plate, a second light-blocking plate and a third light-blocking plate from top to bottom, and each light-blocking plate is fixed to the screw at intervals by fixing nuts; The first, second, and third light-blocking sheets have the same structure and dimensions.

3. The thermostat for a dilution refrigerator with a light-blocking component according to claim 2, characterized in that, Mounting holes are provided at the center of the first, second, and third light-blocking sheets.

4. The thermostat for a dilution refrigerator with a light-blocking component according to claim 3, characterized in that, The inner diameter of the mounting hole is adapted to the outer diameter of the screw.

5. The thermostat for a dilution refrigerator with a light-blocking component according to claim 3, characterized in that, The first, second, and third light-blocking sheets each have a fan-shaped airflow structure with an included angle of 90° along their circumference, and the three airflow structures are installed in a staggered manner between each other.

6. The thermostat for a dilution refrigerator with a light-blocking component according to claim 2, characterized in that, The base flange is provided with a connecting seat corresponding to the position of the screw, and the bottom of the screw is threadedly connected to the connecting seat; The base flange is symmetrically provided with several air passage holes along the center of the outer periphery of the connecting seat; The base flange surface is provided with several threaded holes at equal intervals along its circumference, avoiding several air passage holes.

7. The thermostat for a dilution refrigerator with a light-blocking component according to claim 6, characterized in that, The fixed flange has several third bolt holes corresponding to the positions of several threaded holes, and the threaded holes of the base flange and the third bolt holes of the fixed flange are fixed by screws.

8. The thermostat for a dilution refrigerator with a light-blocking component according to claim 1, characterized in that, The second vacuum tube adopts a corrugated tube structure.

9. The thermostat for a dilution refrigerator with a light-blocking component according to claim 6, characterized in that, The base flange is made of stainless steel.

10. The thermostat for a dilution refrigerator with a light-blocking component according to claim 5, characterized in that, The first, second, and third light-blocking sheets are made of aluminum alloy.

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