CN211476408U - Two-stage low-temperature insertion rod applied to ultra-vacuum environment - Google Patents
Two-stage low-temperature insertion rod applied to ultra-vacuum environment Download PDFInfo
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- CN211476408U CN211476408U CN201922378737.8U CN201922378737U CN211476408U CN 211476408 U CN211476408 U CN 211476408U CN 201922378737 U CN201922378737 U CN 201922378737U CN 211476408 U CN211476408 U CN 211476408U
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Abstract
The invention relates to the technical field of refrigeration, in particular to a two-stage low-temperature insertion rod applied to an ultra-vacuum environment. The low-temperature insertion rod can adopt various low-temperature media, the flange assembly adopts a CF series mounting flange and a switching flange, the sealing standard of ultrahigh vacuum can be met, the transmission measurement of a plurality of electric signals and the connection of a plurality of transmission mechanisms can be simultaneously met, the design structure of the conical surface at the load part can also increase the heat conduction contact area of the load and increase the heat conduction efficiency, and the low-temperature insertion rod has outstanding substantive characteristics and remarkable progress.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a two-stage low-temperature insertion rod applied to an ultra-vacuum environment.
Background
At present, the refrigerating temperature of the domestic liquid nitrogen refrigerating device used in vacuum can only reach about 77K under the influence of refrigerating medium liquid nitrogen. The principle is that the temperature is reduced by utilizing the heat absorption effect generated by the phase change of low-temperature media (such as liquid nitrogen and liquid helium), and other substances reach the same temperature through heat transfer. If lower temperature is to be realized, the refrigerating medium needs to be replaced, and the currently internationally common refrigerating medium liquid helium can realize an extremely low temperature environment of about 4.2K. However, liquid helium cannot be applied to the currently common liquid nitrogen refrigerating device. The structure of the original liquid nitrogen refrigerating device is shown in figure 1, and the main defects are as follows: 1. lower temperatures cannot be achieved with liquid helium refrigerants; 2. the structure is simple, and an enough heat insulation structure is lacked; 3. a large amount of frost and other phenomena are easy to occur at the air inlet and the air outlet; 4. the heat-conducting contact surface is too small, and the heat conductivity is low; 5. the utilization rate of the refrigeration medium is lower due to the special design that the discharged cold nitrogen is not reused.
Disclosure of Invention
The present invention is directed to a two-stage cryogenic insert rod for use in an ultra-vacuum environment to solve the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
the two-stage low-temperature insertion rod applied to the ultra-vacuum environment comprises a flange assembly and a thin-wall pipe module which is arranged on the flange assembly and enables external heat flow to be reduced and transmitted, wherein the flange assembly comprises an installation flange for fixedly inserting the thin-wall pipe module, the thin-wall pipe module comprises a first stainless steel thin-wall pipe fixedly inserted in the installation flange, a second stainless steel thin-wall pipe connected to the lower end of the first stainless steel thin-wall pipe through an oxygen-free copper connecting block, a first cold head connected to the lower end of the second stainless steel thin-wall pipe and used for processing low-temperature medium phase change to generate low temperature, and a central insertion rod used for a low-temperature medium introduction module is inserted in the upper end of the first.
Furthermore, the flange assembly also comprises a plurality of adapter flanges which are arranged on the mounting flange and used for the transmission measurement of a plurality of electric signals and the connection of a plurality of transmission mechanisms.
Furthermore, the mounting flange and the plurality of adapter flanges are in a welding forming structure.
Further, the mounting flange is a CF100 type flange for ensuring ultrahigh vacuum sealing, and the adapter flange is a CF16 type flange for ensuring ultrahigh vacuum sealing.
Furthermore, the mounting flange and the first stainless steel thin-walled tube are fixed by welding.
Furthermore, the thin-walled tube module also comprises a KF exhaust port which is communicated with one side of the first stainless steel thin-walled tube above the mounting flange and the other end of which is connected with a mechanical pump for vacuumizing and reducing the saturated vapor pressure of the low-temperature medium.
Furthermore, the central inserted link comprises a third stainless steel thin-wall pipe penetrating through the first stainless steel thin-wall pipe and the second stainless steel thin-wall pipe and a second cold head connected to the lower end of the third stainless steel thin-wall pipe and inserted into the first cold head.
Furthermore, an interface compatible with a butt joint low-temperature transfusion rod is reserved at the upper end of the central insertion rod.
Furthermore, the second cold head is of a conical structure, three exhaust grooves are formed in the lower end of the second cold head of the conical structure, conical holes are formed in the upper end face and the lower end face of the first cold head, and the conical holes in the upper end of the first cold head are matched and spliced with the conical structure of the second cold head.
Furthermore, a first O-shaped sealing ring is connected at the splicing position of the low-temperature transfusion rod and the center inserted rod, and a second O-shaped sealing ring is connected at the connecting position of the center inserted rod and the first stainless steel thin-wall pipe.
Compared with the prior art, the invention has the beneficial effects that: the low-temperature insertion rod can adopt various low-temperature media, the flange assembly adopts a CF series mounting flange and a switching flange, the sealing standard of ultrahigh vacuum can be met, the transmission measurement of a plurality of electric signals and the connection of a plurality of transmission mechanisms can be simultaneously met, the structure of a plurality of conical surfaces of the first cold head can enable the low-temperature media to generate sufficient phase change, the refrigeration effect is better, the design structure of the conical surface at the load part can also increase the heat conduction contact area of the load and increase the heat conduction efficiency, and the O ring sealing structure of the central insertion rod can reduce the saturated vapor pressure of the low-temperature media by pumping vacuum by a pump set so as to enable the low-temperature media to reach lower temperature; the thin wall design of the stainless steel rod increases heat insulation, reduces heat loss, and has outstanding substantive features and significant progress.
Drawings
FIG. 1 is a schematic diagram of a prior art liquid nitrogen refrigeration apparatus;
FIG. 2 is a schematic view of the flange assembly and thin wall pipe module mounting structure of the present invention;
FIG. 3 is a perspective view of the flange assembly of the present invention;
FIG. 4 is a schematic front view of the structure of FIG. 3 according to the present invention;
FIG. 5 is a schematic top view of the structure of FIG. 3 according to the present invention;
FIG. 6 is a schematic perspective view of a thin-walled tube module according to the present invention;
FIG. 7 is a schematic view of the final assembly of the present invention;
FIG. 8 is a schematic view of the structure of the center insert rod of the present invention.
In the figure: the device comprises a flange assembly 1, a mounting flange 11, a transfer flange 12, a thin-wall pipe module 2, a first stainless steel thin-wall pipe 21, an oxygen-free copper connecting block 22, a second stainless steel thin-wall pipe 23, a KF exhaust port 24, a first cold head 25, a center inserted rod 3, a third stainless steel thin-wall pipe 31, a second cold head 32 and a low-temperature transfusion rod 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2-8, the present invention provides a technical solution:
a two-stage low-temperature insertion rod applied to an ultra-vacuum environment comprises a flange assembly 1 and a thin-walled pipe module 2 which is arranged on the flange assembly 1 and enables external heat flow to be reduced and transmitted, wherein the flange assembly 1 comprises an installation flange 11 for fixedly inserting the thin-walled pipe module 2, the flange assembly 1 further comprises a plurality of adapter flanges 12 which are arranged on the installation flange 11 and used for transmission measurement of a plurality of electric signals and connection of a plurality of transmission mechanisms, the installation flange 11 and the plurality of adapter flanges 12 are of a welding forming structure, the installation flange 11 is a CF100 type flange for ensuring ultra-high vacuum sealing, the adapter flange 12 is a CF16 type flange for ensuring ultra-high vacuum sealing, the thin-walled pipe module 2 comprises a first stainless steel thin-walled pipe 21 fixedly inserted in the installation flange 11, and a second stainless steel thin-walled pipe 23 connected to the lower end of the first stainless steel thin-walled pipe 21 through, The first cold head 25 which is connected to the lower end of the second stainless steel thin-wall pipe 23 and used for processing low-temperature medium phase change to generate low temperature can be used as a low-temperature cold source for other loads, the oxygen-free copper connecting block 22 fully absorbs cold energy of cold waste gas generated after the low-temperature medium phase change and can be used as a cold shield for heat conduction, the utilization rate of the low-temperature medium is improved, the mounting flange 11 and the first stainless steel thin-wall pipe 21 are fixedly welded and connected, and the central inserting rod 3 used for a low-temperature medium leading-in module is inserted into the upper end of the first stainless steel thin-wall pipe.
In addition, the thin-walled tube module 2 further comprises a KF exhaust port 24 which is communicated with one side of the first stainless steel thin-walled tube 21 above the mounting flange 11 and the other end of which is connected with a mechanical pump for vacuumizing to reduce the saturation vapor pressure of the low-temperature medium, so that the temperature is reduced to be lower, the center inserted rod 3 comprises a third stainless steel thin-walled tube 31 which passes through the first stainless steel thin-walled tube 21 and the second stainless steel thin-walled tube 23 and a second cold head 32 which is connected with the lower end of the third stainless steel thin-walled tube 31 and is inserted into the first cold head 25, a second O-shaped sealing ring is connected at the joint of the center inserted rod 3 and the first stainless steel thin-walled tube 21 for sealing, an interface which is compatible with the low-temperature infusion rod 4 is reserved at the upper end of the center inserted rod 3, a first O-shaped sealing ring is connected at the joint of the low-temperature infusion rod 4 and the center inserted rod 3 for sealing, and, three exhaust duct has been seted up to the second cold head 32 lower extreme of toper structure, the bell mouth has all been seted up to the upper and lower terminal surface of first cold head 25, can improve thermal conduction area of contact, thereby promote thermal conduction efficiency, the bell mouth of first cold head 25 upper end matches with the toper structure of second cold head 32 and pegs graft, the bell mouth of first cold head 25 lower extreme is connected the heat load spare part that matches with it, low temperature medium passes through thin wall pipe module 2 that low temperature transfusion rod 4 got into central inserted bar 3, take place the refrigeration after the phase transition through second cold head 32, gas after the phase transition is discharged through the clearance groove between second cold head 32 exhaust duct and the bell mouth.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a be applied to two-stage low temperature inserted bar of super vacuum environment, includes flange subassembly (1) and installs thin wall pipe module (2) that make external heat flow reduce the transmission on flange subassembly (1), its characterized in that: the flange component (1) comprises an installation flange (11) for fixedly inserting the thin-wall pipe module (2), the thin-wall pipe module (2) comprises a first stainless steel thin-wall pipe (21) fixedly inserted in the installation flange (11), a second stainless steel thin-wall pipe (23) connected to the lower end of the first stainless steel thin-wall pipe (21) through an oxygen-free copper connecting block (22), and a first cold head (25) connected to the lower end of the second stainless steel thin-wall pipe (23) and used for processing low-temperature medium phase change to generate low temperature, and a central insertion rod (3) used for leading the low-temperature medium into the module is inserted in the upper end of the first stainless steel thin-wall pipe (21).
2. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 1, wherein: the flange assembly (1) further comprises a plurality of adapter flanges (12) which are arranged on the mounting flange (11) and used for transmission measurement of a plurality of electric signals and connection of a plurality of transmission mechanisms.
3. A two-stage cryogenic insert rod for use in an ultra-vacuum environment as claimed in claim 2, wherein: the mounting flange (11) and the plurality of adapter flanges (12) are of welded forming structures.
4. A two-stage cryogenic insert rod for use in an ultra-vacuum environment as claimed in claim 3, wherein: the mounting flange (11) is a CF100 type flange for ensuring ultrahigh vacuum sealing, and the adapter flange (12) is a CF16 type flange for ensuring ultrahigh vacuum sealing.
5. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 1, wherein: the mounting flange (11) and the first stainless steel thin-walled tube (21) are fixed in a welding mode.
6. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 1, wherein: the thin-wall pipe module (2) further comprises a KF exhaust port (24) which is communicated with the first stainless steel thin-wall pipe (21) and is positioned on one side above the mounting flange (11), and the other end of the KF exhaust port is connected with a mechanical pump for vacuumizing to reduce the saturated vapor pressure of the low-temperature medium.
7. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 1, wherein: the central inserted rod (3) comprises a third stainless steel thin-wall pipe (31) penetrating through the first stainless steel thin-wall pipe (21) and the second stainless steel thin-wall pipe (23) and a second cold head (32) connected to the lower end of the third stainless steel thin-wall pipe (31) and inserted into the first cold head (25).
8. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 7, wherein: and a compatible interface for butting the low-temperature transfusion rod (4) is reserved at the upper end of the central inserted rod (3).
9. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 8, wherein: the second cold head (32) is of a conical structure, three exhaust grooves are formed in the lower end of the second cold head (32) of the conical structure, conical holes are formed in the upper end face and the lower end face of the first cold head (25), and the conical holes in the upper end of the first cold head (25) are matched and spliced with the conical structure of the second cold head (32).
10. The two-stage cryogenic insert rod for use in an ultra-vacuum environment of claim 8, wherein: the splicing part of the low-temperature transfusion rod (4) and the center inserted rod (3) is connected with a first O-shaped sealing ring, and the splicing part of the center inserted rod (3) and the first stainless steel thin-wall pipe (21) is connected with a second O-shaped sealing ring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922378737.8U CN211476408U (en) | 2019-12-23 | 2019-12-23 | Two-stage low-temperature insertion rod applied to ultra-vacuum environment |
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| CN201922378737.8U CN211476408U (en) | 2019-12-23 | 2019-12-23 | Two-stage low-temperature insertion rod applied to ultra-vacuum environment |
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| CN211476408U true CN211476408U (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023653A (en) * | 2019-12-23 | 2020-04-17 | 上海蜀淘仪器科技有限公司 | Two-stage low-temperature insertion rod applied to ultra-vacuum environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111023653A (en) * | 2019-12-23 | 2020-04-17 | 上海蜀淘仪器科技有限公司 | Two-stage low-temperature insertion rod applied to ultra-vacuum environment |
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