CN2094096U - Cryogenic cold finger for nuclear logger - Google Patents
Cryogenic cold finger for nuclear logger Download PDFInfo
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- CN2094096U CN2094096U CN 91204715 CN91204715U CN2094096U CN 2094096 U CN2094096 U CN 2094096U CN 91204715 CN91204715 CN 91204715 CN 91204715 U CN91204715 U CN 91204715U CN 2094096 U CN2094096 U CN 2094096U
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- piston
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- expansion chamber
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- cold finger
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Abstract
The utility model relates to a cryogenic cold finger for nuclear logger, comprising a high-purity germanium detector and a refrigerating apparatus on the detector, wherein, the high-purity germanium detector comprises a vacuum dewar flask, and high purity-germanium vacuum crystals are arranged in the vacuum dewar flask. Cold quantity is supplied to the high-purity germanium crystal through the refrigerating apparatus, so as to meet the requirement that the high-purity germanium crystal can absorb a certain frequency spectrum radiation under-160DEG. C., to cause a nuclear logger to detect in 30-50 hours continuously, and to meet the requirement of speed-increase for the nuclear logger. The utility model brings convenience to field logging operation particularly.
Description
The utility model relates to nuclear energy logging technology field.
Nuclear logging is the technology that just grows up in recent years, and it utilizes the different frequency spectrum of metallic element to judge underground resource situation, has simply, accurately, do not destroy landforms, at the scene just can analyzing and processing, the characteristics of reaching a conclusion.Existing nuclear logging instrument comprises four major parts: computing machine, electronic circuit, cryogenic cold finger (containing high purity germanium detector), neutron source, four major parts are encapsulated in the metal shell (with reference to Fig. 1).During work, send gamma-rays by neutron source and penetrate the down-hole landforms, absorb the acquisition feedback signal by the high purity germanium detector that is in low-temperature condition, obtain spectrum value by electronic circuit acceptance and by computing machine again, thereby judge the situation of subterranean resource according to the different spectrum value of metallic element.The HpGe that uses in the above-mentioned nuclear logging instrument (HPGe) detector can be preserved at normal temperatures, but must reduce to-160 ℃ low temperature when surveying, and keep can operate as normal under this temperature.Prior art adopts Lyons (F22) or propane in low-temperature liquid ammonia (LN2) the precooling fluorine, just because of adopt low temperature liquid nitrogen (LN2) precooling, then limited the range of application of high purity germanium detector greatly, as can not be away from the big city, otherwise liguefied nitrogen can't solve, simultaneously, because of the cold deficiency, only can keep 6-8 hour in the down-hole continuous probe time, for 1000 meters dark coalfields and the dark oil field of 3500-4000 rice, finish once to promote to survey and want at least more than 20 hours, bring very big inconvenience for open-air logging operation.
The purpose of this utility model is to propose a kind of cryogenic cold finger that is used on the nuclear logging instrument high purity germanium detector, can make high purity germanium detector survey, and can satisfy the high purity germanium detector requirement in the pulling speed V=50 rice/time when well logging in the down-hole long-time continuous.
Fig. 1 is the structural representation of nuclear logging instrument.
Fig. 2 is a structure principle chart of the present utility model.
With reference to Fig. 1, nuclear logging instrument comprises a neutron source (4), and neutron source (4) is by leading Line and the cryogenic cold finger on it (3) link, dispose electronic circuit (2) on the cryogenic cold finger (3), electronic circuit (2) links with computer (1), and computer (1), electronic circuit (2), cryogenic cold finger (3), neutron source (4) all are enclosed in the metal shell (5).
During work, launch gamma-rays by neutron source (4), feed back by landforms, received by in the cryogenic cold finger (3), that be in low-temperature condition, high purity germanium detector, by electronic circuit (2) part, after computing machine (1) processing, obtain different spectrum values, thereby judge the composition of underground mine according to different spectrum values.
With reference to Fig. 2, the utility model comprise a high purity germanium detector and on refrigerating plant, said high purity germanium detector comprises that one is placed on the interior HpGe crystal (10) of vacuum chamber (8) of vacuum Dewar bottle (6), the electrical lead wire of HpGe crystal (10) is drawn by sealing insulator (7), in order to keep reliable vacuum tightness, can be in the outside of HpGe crystal (10) envelope with thermoscreen (9).HpGe crystal (10) is placed on the crystal platform (11), and its required low temperature cold is provided by the refrigerating plant that places top; Said refrigerating plant is divided into the expansion chamber portion of bottom and the compression chamber portion on top, the expansion chamber of expansion chamber portion (13) matches with HpGe crystal (10), in order to reduce the reconnaissance influence of mechanical vibration to HpGe crystal (10), between expansion chamber (13) and HpGe crystal (10) cushion pad (12) can be set, cushion pad (12) can be made by 200 purpose red copper silk flosssilk waddings.
Expansion chamber portion comprise expansion chamber (13) and on regenerator (14), regenerator (14) matches with cylinder piston group (15), the piston of cylinder piston group (15) matches with resonance linear electric motors (17), for the size of limited piston displacement, descending shelves stop (16) and up shelves stop (19) can be set at the piston two ends.Regenerator (14) can be worked out by 200-300 purpose 1Cr18Ni9Ti stainless steel cloth.Wherein filled about 600 heat exchange mediums, cylinder piston group (15) can be made by engineering ceramics silicon nitride Si3N4.
Compression chamber portion comprises a cylinder (20), dispose piston (22) in the cylinder (20), cylinder (20) and piston (22) constitute one provides the compression chamber (21) of certain pressure gas to expansion chamber (13), and piston (22) matches with resonance linear electric motors (24).In order to limit and to protect compression chamber (21) not broken, descending stop (23) and up stop (27) can be set at the two ends of piston (22); Whole compression chamber portion has certain pressure, is born by shell (25), and resonance linear electric motors (24) are supported by two groups of springs (26); In order to guarantee the work efficiency of whole cryogenic cold finger, a volume of cylinder regulating device (28) can be set on the top of shell (25), can adjust required volume of cylinder at any time.Cylinder (20) and piston (22) can adopt engineering ceramics silicon nitride Si3N4 to make.
Principle of work of the present utility model is: the gas that at first charges into certain pressure at the refrigerating plant inner chamber, energized then, it is reciprocating that then resonance linear electric motors (24) drive piston (22), the gaseous tension of compression chamber (21) is raise, gases at high pressure enter expansion chamber (13) and expand, freeze, and cold is passed to HpGe crystal (10) by cushion pad (12).
This shows, therefore, to have that cold is big, the long characteristics of holding time because the utility model adopts refrigerating plant cold to be provided for the HpGe crystal.
Claims (5)
1, a kind of cryogenic cold finger that is used for nuclear logging instrument, comprise a high purity germanium detector and on refrigerating plant, said high purity germanium detector comprises a vacuum Dewar bottle (6), HpGe crystal (10) in the vacuum Dewar bottle (6), feature of the present utility model is, said refrigerating plant is divided into the expansion chamber of bottom and the compression chamber portion on top, and the expansion chamber (13) of said expansion chamber portion matches with HpGe crystal (10).
2, cryogenic cold finger according to claim 1, it is characterized in that, said expansion chamber portion comprise an expansion chamber (13) that matches with HpGe crystal (10) and on regenerator (14), regenerator (14) matches with cylinder piston group (15), and the piston of cylinder piston group (15) matches with resonance linear electric motors (17).
3, according to claim 1,2 described cryogenic cold fingers, it is characterized in that, said compression chamber portion comprises a cylinder (20), dispose piston (22) in the cylinder (20), cylinder (20) and piston (22) constitute one provides the compression chamber (21) of certain pressure gas to expansion chamber (13), and piston (22) matches with resonance linear electric motors (24).
4, cryogenic cold finger according to claim 2 is characterized in that, the cylinder of said cylinder piston group (15) and piston are made by engineering ceramics silicon nitride Si3N4.
5, cryogenic cold finger according to claim 3 is characterized in that, described piston (22), cylinder (20) are made by engineering ceramics silicon nitride Si3N4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91204715 CN2094096U (en) | 1991-03-25 | 1991-03-25 | Cryogenic cold finger for nuclear logger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91204715 CN2094096U (en) | 1991-03-25 | 1991-03-25 | Cryogenic cold finger for nuclear logger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2094096U true CN2094096U (en) | 1992-01-22 |
Family
ID=4914746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91204715 Withdrawn CN2094096U (en) | 1991-03-25 | 1991-03-25 | Cryogenic cold finger for nuclear logger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2094096U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728651A (en) * | 2013-12-12 | 2014-04-16 | 西北核技术研究所 | High-purity germanium detector vacuum maintaining system with thermal purification function |
| CN105136313A (en) * | 2015-09-22 | 2015-12-09 | 中国科学院上海技术物理研究所 | Liquid nitrogen horizontal refrigeration device for testing infrared detector Dewar assembly and design method thereof |
| WO2017177517A1 (en) * | 2016-04-11 | 2017-10-19 | 中国科学院声学研究所 | X-ray fluorescence logging probe for deep well detection |
| CN113985471A (en) * | 2021-10-28 | 2022-01-28 | 清华大学 | High-purity germanium detector |
-
1991
- 1991-03-25 CN CN 91204715 patent/CN2094096U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728651A (en) * | 2013-12-12 | 2014-04-16 | 西北核技术研究所 | High-purity germanium detector vacuum maintaining system with thermal purification function |
| CN105136313A (en) * | 2015-09-22 | 2015-12-09 | 中国科学院上海技术物理研究所 | Liquid nitrogen horizontal refrigeration device for testing infrared detector Dewar assembly and design method thereof |
| CN105136313B (en) * | 2015-09-22 | 2018-08-14 | 中国科学院上海技术物理研究所 | Infrared detector dewar assembly test liquid nitrogen horizontal refrigerating plant and design method |
| WO2017177517A1 (en) * | 2016-04-11 | 2017-10-19 | 中国科学院声学研究所 | X-ray fluorescence logging probe for deep well detection |
| CN113985471A (en) * | 2021-10-28 | 2022-01-28 | 清华大学 | High-purity germanium detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |