A Helium III pot for Helium III plug-in

Abstract

The present invention relates to the technical field of extremely low-temperature refrigeration systems, and in particular to a Helium-3 Pot for Helium-3 plug-ins, comprising a Helium-3 Pot housing, a Helium-3 Pot cover plate disposed at the top of the inner portion of the Helium-3 Pot housing, and a Helium-3 Pot transition welding cover plate disposed at the top of the inner portion of the Helium-3 Pot housing, which is sleeved over the Helium-3 Pot cover plate. The Helium-3 Pot transition welding cover plate has an annular groove B formed at the top of the Helium-3 Pot transition welding cover plate, and an annular groove A formed at the top of the Helium-3 Pot cover plate. Because the annular thin wall formed by the annular groove A on the Helium-3 Pot cover plate and the annular thin wall formed by the annular groove B on the Helium-3 Pot transition welding cover plate require little energy for welding, welding quality can be guaranteed. The bottom of the Helium-3 Pot housing is filled with nano-silver powder to enhance heat exchange performance at the bottom of the Helium-3 Pot housing.

Description

Technical Field

[0001] The present invention relates to the technical field of extremely low temperature refrigeration systems, and in particular to a Helium-3 pot for a Helium-3 plug-in. Background Art

[0002] Helium-3 plug-ins are refrigeration equipment widely used in the field of extremely low temperatures. They have the performance of rapid sample exchange and cooling. Helium-3 plug-ins can be used in basic research fields including quantum transport, low-temperature physics research, and spin electronics research. Helium-3 plug-ins can provide a temperature environment of 300mK or even lower, and can maintain the lowest temperature for dozens of hours or even longer. Helium-3 plug-ins use the physical properties of liquid helium - the saturated vapor pressure has a monotonic relationship with temperature to obtain a low-temperature environment. The specific implementation is based on the principle that the built-in activated carbon can adsorb a large amount of helium-3 at low temperatures, thereby adsorbing liquid helium-3, thereby reducing the saturated vapor pressure of helium-3 and obtaining the required extremely low temperature;

[0003] There is no specific structure in the container used to load liquid helium-3 in the helium-3 plug-in. The liquid helium-3 is only placed in the helium-3 plug-in. The container is both the location where the refrigeration effect is generated and the location where a low-temperature environment is directly provided to the sample. The existing welding process between the container for loading liquid helium-3 and the helium-3 plug-in is poor, and there is a risk of leakage under extremely low temperature conditions. At the same time, the heat transfer performance is poor, and the heat exchange temperature difference between the container and the sample is large. Summary of the Invention

[0004] The present invention provides a helium-3 pot for a helium-3 plug-in to solve the problem that the container for loading liquid helium-3 in the above-mentioned helium-3 plug-in has no specific structure for placing liquid helium-3, which poses a risk of leakage under extremely low temperature conditions and has poor heat transfer performance.

[0005] The present invention provides a helium-3 pot for a helium-3 plug-in, comprising a helium-3 pot shell, a helium-3 pot cover plate provided at the top inner top of the helium-3 pot shell, a helium-3 pot transition welding cover plate sleeved on the outer side of the helium-3 pot cover plate provided at the top inner top of the helium-3 pot shell, an annular groove B provided at the top end of the helium-3 pot transition welding cover plate, an annular groove A provided at the top end of the helium-3 pot cover plate, the helium-3 pot transition welding cover plate and the helium-3 pot cover plate side wall forming a welding component through the annular groove B and the annular groove A respectively, the helium-3 pot transition welding cover plate being welded and fixed to the helium-3 pot shell and the helium-3 pot cover plate respectively, an inner hole provided in the helium-3 pot cover plate, nano silver powder being sintered at the bottom end of the inner wall of the helium-3 pot shell, and a thermal layer threaded hole provided at the bottom end of the helium-3 pot shell.

[0006] Preferably, an annular groove is provided at the bottom end of the inner wall of the helium triple pot shell, and nano silver powder is sintered inside the annular groove.

[0007] Preferably, a plurality of sample stage threaded holes are provided at the bottom end of the helium triple pot housing.

[0008] Preferably, a notch is provided at a side end of the helium triple pot shell.

[0009] Preferably, the inner side wall of the helium triple pot shell and the inner welding part of the helium triple pot transition welding cover plate are connected by vacuum brazing.

[0010] Preferably, the outer welding part of the helium-3pot cover plate and the inner welding part of the helium-3pot transition welding cover plate are connected by argon arc welding or laser welding.

[0011] The above technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0012] 1. The structure provided by the present invention requires little energy for welding the annular thin wall formed by the annular groove A on the helium triple pot cover plate and the annular thin wall formed by the annular groove B on the helium triple pot transition welding cover plate, thereby ensuring welding quality and preventing the pore structure of the silver powder from being destroyed.

[0013] 2. The structure provided by the present invention increases the heat exchange performance of the bottom of the helium triple pot shell by filling nano silver powder at the bottom of the helium triple pot shell and reduces the heat exchange temperature difference between the helium triple pot shell and the sample;

[0014] 3. The structure provided by the present invention reduces the bottom thickness of the helium triple pot shell through the annular groove, thereby reducing the heat transfer distance between the helium triple pot shell and the sample. At the same time, the nano silver powder is sintered into the annular groove, further increasing the mass of the sintered silver powder, thereby achieving a better heat transfer effect.

[0015] 4. The structure provided by the present invention has a sample table threaded hole reserved in the helium triple pot shell, which is convenient for fixing the sample and improving convenience;

[0016] 5. The structure provided by the present invention facilitates the installation of corresponding testing cables through the gap opened at the side end of the helium triple pot shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a bottom view of the helium-3 pot shell;

[0021] Figure 3 This is a top view of the interior of the helium-3 pot shell.

[0022] 1. Helium III Pot shell; 2. Helium III Pot transition welding cover; 3. Helium III Pot cover; 4. Annular groove A; 5. Annular groove B; 6. Inner hole; 7. Sample stage threaded hole; 8. Thermal layer threaded hole; 9. Helium III Pot shell bottom plate; 10. Annular groove. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0024] Various embodiments of the present invention may be presented in the form of a range. It should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the present invention. Therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, regardless of the range. In addition, whenever a numerical range is indicated in the present invention, it is intended to include any quoted number (fractional or integer) within the indicated range. Unless otherwise specified, the various raw materials, reagents, instruments and equipment used in the present invention can be purchased commercially or can be prepared by existing equipment.

[0025] In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", specifically refer to the directions of the drawings in the accompanying drawings. In addition, in the present invention, the terms "including", "comprising", etc. mean "including but not limited to". In the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. In the present invention, "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. Wherein A and B can be singular or plural. In the present invention, "at least one" means one or more, and "plurality" means two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab, i.e. a and b, ac, bc, or abc, where a, b, c can be single or multiple.

[0026] like Figure 1-Figure 3 As shown, a helium-3 pot for a helium-3 plug-in includes a helium-3 pot shell 1, a helium-3 pot cover plate 3 is provided at the top inner top of the helium-3 pot shell 1, a helium-3 pot transition welding cover plate 2 is provided on the outside of the helium-3 pot cover plate 3, an annular groove B5 is provided at the top end of the helium-3 pot transition welding cover plate 2, an annular groove A4 is provided at the top end of the helium-3 pot cover plate 3, the helium-3 pot transition welding cover plate 2 and the side walls of the helium-3 pot cover plate 3 are respectively welded to the helium-3 pot shell 1 and the helium-3 pot cover plate 3, an inner hole 6 is provided inside the helium-3 pot cover plate 3, nano silver powder is sintered at the bottom end of the inner wall of the helium-3 pot shell 1, and a thermal layer threaded hole 8 is provided at the bottom end of the helium-3 pot shell 1.

[0027] Specifically, the annular thin wall formed by the annular groove A4 on the Helium III Pot cover plate 3 and the annular thin wall formed by the annular groove B5 on the Helium III Pot transition welding cover plate 2, as welding components, require little energy during welding, ensuring welding quality and preventing the pore structure of the silver powder from being destroyed. The nano-silver powder filled and sintered at the bottom of the Helium III Pot shell 1, through the sintered silver powder with extremely developed pores, greatly increases the heat exchange area at the bottom of the Helium III Pot, improves the heat exchange performance at the bottom of the Helium III Pot shell 1, and significantly reduces the heat exchange temperature difference between the Helium III Pot shell 1 and the sample.

[0028] like Figure 3 As shown: an annular groove 10 is provided at the bottom of the inner wall of the helium triple pot shell 1, and nano silver powder is sintered inside the annular groove 10.

[0029] Specifically, the inner side of the bottom of the Helium Triple Pot housing 1 has an annular groove 10, which reduces the thickness of the bottom of the Helium Triple Pot housing 1 and reduces the heat transfer distance between the Helium Triple Pot housing and the sample. At the same time, the nano silver powder is sintered into the annular groove 10, further increasing the mass of the sintered silver powder, thereby achieving a better heat transfer effect.

[0030] like Figure 2 As shown: a plurality of sample table threaded holes 7 are opened at the bottom of the helium-3 pot housing 1.

[0031] Specifically: the sample stage threaded hole 7 is convenient for fixing the sample stage;

[0032] like Figure 1 As shown: a notch is provided on the side of the helium triple pot shell 1.

[0033] Specifically: it is convenient for testing cable routing;

[0034] like Figure 1 As shown, the inner wall of the helium-3 pot shell 1 and the inner welding part of the helium-3 pot transition welding cover plate 2 are connected by vacuum brazing.

[0035] like Figure 1 As shown: the outer welding part of the helium-3 pot cover plate 3 and the inner welding part of the helium-3 pot transition welding cover plate 2 are connected by argon arc welding or laser welding.

[0036] Specifically: low-energy argon arc welding or laser welding is used to connect the silver powder pores in the helium-3 pot without being destroyed.

[0037] Principle of use: Laser weld a stainless steel tube of corresponding size to the inner hole 6 of the helium-3 pot cover 3 as the air intake pipe of the helium-3 pot shell 1. The sample table threaded hole 7 reserved in the helium-3 pot shell 1 is convenient for fixing the sample through the reserved hole position; the annular thin wall formed by the annular groove A4 on the helium-3 pot cover 3 and the annular thin wall formed by the annular groove B5 on the helium-3 pot transition welding cover 2 require little energy during welding, which ensures the welding quality and avoids the pore structure of the silver powder from being destroyed, thereby improving the overall structural strength and stability of the device; through the helium-3 pot The nano-silver powder filled and sintered at the bottom of the shell 1 greatly increases the heat exchange area at the bottom of the helium-3 pot through the sintered silver powder with extremely developed pores, improves the heat exchange performance of the bottom of the helium-3 pot shell 1, and significantly reduces the heat exchange temperature difference between the helium-3 pot and the sample; when an annular groove 10 is opened at the bottom of the helium-3 pot shell 1, the annular groove 10 reduces the thickness of the bottom of the helium-3 pot shell 1, reduces the heat transfer distance between the helium-3 pot shell and the sample, further increases the utilization effect of the nano-silver powder, and at the same time, the nano-silver powder is sintered into the inside of the annular groove 10, further increasing the mass of the sintered silver powder, thereby achieving better heat transfer effect.

[0038] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be construed in the widest manner consistent with the principles and novel features claimed herein.

Claims

1. A Helium-3 Pot for a Helium-3 plug-in, comprising a Helium-3 Pot housing (1), characterized in that: The top of the inner top of the helium three pot shell (1) is provided with a helium three pot cover plate (3), the top of the inner top of the helium three pot shell (1) is provided with a helium three pot transition welding cover plate (2) sleeved on the outer side of the helium three pot cover plate (3), the top of the helium three pot transition welding cover plate (2) is provided with an annular groove B (5), the top of the helium three pot cover plate (3) is provided with an annular groove A (4), the helium three pot transition welding cover plate (2) and the side wall of the helium three pot cover plate (3) are respectively formed into a welding component through the annular groove B (5) and the annular groove A (4), the helium three pot transition welding cover plate (2) is respectively welded and fixed to the helium three pot shell (1) and the helium three pot cover plate (3), the inside of the helium three pot cover plate (3) is provided with an inner hole (6), the bottom end of the inner wall of the helium three pot shell (1) is sintered with nano silver powder, and the bottom end of the helium three pot shell (1) is provided with a thermal layer threaded hole (8).

2. The Helium-3 pot for Helium-3 plug-in according to claim 1, characterized in that: An annular groove (10) is provided at the bottom end of the inner wall of the helium triple pot shell (1), and nano silver powder is sintered inside the annular groove (10).

3. A Helium-3 pot for a Helium-3 plug-in according to claim 1 or 2, characterized in that: A plurality of sample stage threaded holes (7) are provided at the bottom end of the helium triple pot housing (1).

4. The Helium-3 pot for Helium-3 plug-in according to claim 3, characterized in that: A notch is provided at the side end of the helium triple pot housing (1).

5. The Helium-3 pot for Helium-3 plug-in according to claim 4, characterized in that: The inner side wall of the helium triple pot shell (1) and the inner side welding part of the helium triple pot transition welding cover plate (2) are connected by vacuum brazing.

6. The Helium-3 pot for Helium-3 plug-in according to claim 4, characterized in that: The outer welding part of the helium triple pot cover plate (3) and the inner welding part of the helium triple pot transition welding cover plate (2) are connected by argon arc welding or laser welding.

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