CN103486794B - A kind of Cryo Equipment for superconduction frequency stabilization oscillator and using method thereof - Google Patents
A kind of Cryo Equipment for superconduction frequency stabilization oscillator and using method thereof Download PDFInfo
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- CN103486794B CN103486794B CN201310418835.4A CN201310418835A CN103486794B CN 103486794 B CN103486794 B CN 103486794B CN 201310418835 A CN201310418835 A CN 201310418835A CN 103486794 B CN103486794 B CN 103486794B
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- frequency stabilization
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Abstract
The invention discloses a kind of Cryo Equipment for superconduction frequency stabilization oscillator and using method thereof, this Cryo Equipment comprises Dewar (1), Pressure gauge (2), first valve (4), second valve (5), pressure maintaining valve (6) and dry pump (7), on the upper surface that described Dewar (1) is located at by described Pressure gauge (2) or sidewall, the upper surface of described Dewar (1) is provided with liquid helium perfusing hole (8), described first valve (4), the connection that crosses of described second valve (5) and one end of described pressure maintaining valve (6) is be connected by the upper surface of vacuum tube (3) with described Dewar (1) behind a road, described first valve (4), the connection that crosses of described second valve (5) and the other end of described pressure maintaining valve (6) is be connected with described dry pump (7) by vacuum tube (3) behind a road.Described Cryo Equipment can control the rate of temperature fall in Dewar effectively, and its rate of temperature fall can reach 1.1K/ hour.Described Cryo Equipment is provided with pressure maintaining valve, thus can keep the temperature constant in Dewar.The temperature stability of described Cryo Equipment can reach 0.0001K.
Description
Technical field
The present invention relates to Cryo Equipment technical field, particularly a kind of Cryo Equipment for superconduction frequency stabilization oscillator and using method thereof.
Background technology
The frequency stability of superconduction frequency stabilization oscillator (SCSO) can reach 10
-15-10
-16magnitude, considerably beyond hydrogen atomic clock, rubidium atomic clock and cesium-beam atomic clock.Therefore, superconduction frequency stabilization oscillator is widely used in the technical fields such as space navigation and global positioning navigation.Superconduction frequency stabilization oscillator is formed primarily of superconducting cavity, high-gain low-noise frequency-locked loop, VCO source and Cryo Equipment.Wherein, Cryo Equipment is used for providing low temperature environment, and the stability of low temperature environment will directly affect the performance indications of superconduction frequency stabilization oscillator.
In prior art, the method obtaining low temperature environment has the following two kinds:
(1) refrigeration machine is utilized to freeze;
(2) Roots vaccum pump is utilized directly to carry out decompression cooling to Dewar.
Above-mentioned two kinds of methods exist following not enough:
(1) temperature stability of the low temperature environment obtained is lower, and its temperature stability is the highest only has 0.05K;
(2) noise of refrigeration machine is large, and expensive.
Summary of the invention
An object of the present invention is to provide a kind of Cryo Equipment for superconduction frequency stabilization oscillator.
Two of object of the present invention is to provide a kind of using method of the Cryo Equipment for superconduction frequency stabilization oscillator.
Cryo Equipment for superconduction frequency stabilization oscillator provided by the invention comprises Dewar, Pressure gauge, the first valve, the second valve, pressure maintaining valve and dry pump; On the upper surface that described Dewar is located at by described Pressure gauge or sidewall, the upper surface of described Dewar is provided with liquid helium perfusing hole, described first valve, described second valve and one end of described pressure maintaining valve cross, and to be connected be connected by the upper surface of vacuum tube with described Dewar behind a road, and the connection that crosses of described first valve, described second valve and the other end of described pressure maintaining valve is be connected with described dry pump by vacuum tube behind a road.
Preferably, described Cryo Equipment comprises the vacuum cylinder be located in described Dewar further, and this vacuum cylinder is positioned at the bottom of described Dewar.
Preferably, described vacuum tube is corrugated vacuum tube.
Preferably, the pumping speed of described dry pump is 5-12L/s.
Preferably, described second valve is needle-valve.
The using method of the Cryo Equipment for superconduction frequency stabilization oscillator provided by the invention comprises the steps:
In described Dewar, pour into liquid helium by the described liquid helium perfusing hole being located at the upper surface of described Dewar, liquid helium is filled rear blind flange and is sealed by described liquid helium perfusing hole, and the temperature now in described Dewar is 4.2K;
Described dry pump is opened when described first valve, described second valve and described pressure maintaining valve are in closed condition;
After described dry pump running is stable, slowly opening described first valve, is 3-5 minute/week according to the opening speed that described manometric reading controls described first valve;
When described first valve is all opened and air pressure fall off rate in described Dewar is 40-50kPa/h, slowly open described second valve, the air pressure in described Dewar is finely tuned;
When temperature in described Dewar drops to 2.0K, no longer continue to open described second valve, and open described pressure maintaining valve;
Until the temperature stabilization in described Dewar be after 2.0K for.
The present invention has following beneficial effect:
(1) described Cryo Equipment can control the rate of temperature fall in Dewar effectively, and its rate of temperature fall can reach 1.1K/ hour;
(2) described Cryo Equipment is provided with pressure maintaining valve, thus can keep the temperature constant in Dewar;
(3) described Cryo Equipment is provided with vacuum cylinder, thus the air pressure change that can effectively reduce in Dewar is on the impact of high stable low temperature environment;
(4) temperature stability of described Cryo Equipment can reach 0.0001K;
(5) cost of described Cryo Equipment is low.
Accompanying drawing explanation
The structural representation of the Cryo Equipment for superconduction frequency stabilization oscillator that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, summary of the invention of the present invention is further described.
The Cryo Equipment for superconduction frequency stabilization oscillator that the present embodiment provides comprises Dewar 1, Pressure gauge 2, first valve 4, second valve 5, pressure maintaining valve 6, dry pump 7 and vacuum cylinder 9, as shown in Figure 1.
Vacuum cylinder 9 is located in Dewar 1, and vacuum cylinder 9 is positioned at the bottom of Dewar 1.Vacuum cylinder 9 effectively can reduce air pressure change in Dewar to the impact of high stable low temperature environment.On the upper surface that Dewar 1 is located at by Pressure gauge 2 or sidewall, for monitoring the air pressure in Dewar 1.In the present embodiment, the such as upper surface of Dewar 1 is located at by Pressure gauge 2 by flange.The upper surface of Dewar 1 is provided with liquid helium perfusing hole 8.First valve 4, second valve 5 and one end of pressure maintaining valve 6 cross, and to be connected be connected by the upper surface of vacuum tube 3 with Dewar 1 behind a road, and the connection that crosses of the first valve 4, second valve 5 and the other end of pressure maintaining valve 6 is be connected with dry pump 7 by vacuum tube 3 behind a road.First valve 4 and the second valve 5 are for controlling the rate of temperature fall in Dewar, and the first valve 4 is for coarse adjustment, and the second valve 5 is for fine tuning.In the present embodiment, vacuum tube 3 adopts such as corrugated vacuum tube.The pumping speed of dry pump 7 is 5-12L/s.Second valve 5 adopts such as needle-valve.
The using method of the Cryo Equipment for superconduction frequency stabilization oscillator that the present embodiment provides comprises the steps:
S1: pour into liquid helium by the liquid helium perfusing hole 8 being located at the upper surface of Dewar 1 in Dewar 1, liquid helium is filled rear blind flange and is sealed by liquid helium perfusing hole 8, and the temperature now in Dewar 1 is 4.2K;
S2: open dry pump 7 when the first valve 4, second valve 5 and pressure maintaining valve 6 are in closed condition;
S3: after dry pump 7 running is stable, slowly open the first valve 4, the opening speed controlling the first valve 4 according to the reading of Pressure gauge 2 is 3-5 minute/week;
S4: when the first valve 4 is all opened and air pressure fall off rate in Dewar 1 is 40-50kPa/h, slowly open the second valve 5, the air pressure in Dewar 1 is finely tuned;
S5: when the temperature in Dewar 1 drops to 2.0K, no longer continues to open the second valve 5, and opens pressure maintaining valve 6;
S6: until the temperature stabilization in Dewar 1 be after 2.0K for.
Described Cryo Equipment can control the rate of temperature fall in Dewar effectively, and its rate of temperature fall can reach 1.1K/ hour.Described Cryo Equipment is provided with pressure maintaining valve, thus can keep the temperature constant in Dewar.Described Cryo Equipment is provided with vacuum cylinder, thus the air pressure change that can effectively reduce in Dewar is on the impact of high stable low temperature environment.The temperature stability of described Cryo Equipment can reach 0.0001K.
Should be appreciated that above is illustrative and not restrictive by preferred embodiment to the detailed description that technical scheme of the present invention is carried out.Those of ordinary skill in the art can modify to the technical scheme described in each embodiment on the basis of reading description of the present invention, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. for the Cryo Equipment of superconduction frequency stabilization oscillator, it is characterized in that, this Cryo Equipment comprises Dewar (1), Pressure gauge (2), the first valve (4), the second valve (5), pressure maintaining valve (6) and dry pump (7), on the upper surface that described Dewar (1) is located at by described Pressure gauge (2) or sidewall, the upper surface of described Dewar (1) is provided with liquid helium perfusing hole (8), described first valve (4), the connection that crosses of described second valve (5) and one end of described pressure maintaining valve (6) is be connected by the upper surface of vacuum tube (3) with described Dewar (1) behind a road, described first valve (4), the connection that crosses of described second valve (5) and the other end of described pressure maintaining valve (6) is be connected with described dry pump (7) by vacuum tube (3) behind a road,
Described Cryo Equipment comprises the vacuum cylinder (9) be located in described Dewar (1) further, and this vacuum cylinder (9) is positioned at the bottom of described Dewar (1).
2. the Cryo Equipment for superconduction frequency stabilization oscillator according to claim 1, is characterized in that, described vacuum tube (3) is corrugated vacuum tube.
3. the Cryo Equipment for superconduction frequency stabilization oscillator according to claim 1, is characterized in that, the pumping speed of described dry pump (7) is 5-12L/s.
4. the Cryo Equipment for superconduction frequency stabilization oscillator according to claim 1, is characterized in that, described second valve (5) is needle-valve.
5. the using method of the Cryo Equipment for superconduction frequency stabilization oscillator as described in any one of claim 1-4, is characterized in that, this using method comprises the steps:
By being located at described liquid helium perfusing hole (8) perfusion liquid helium in described Dewar (1) of the upper surface of described Dewar (1), liquid helium is filled rear blind flange and described liquid helium perfusing hole (8) is sealed, and the temperature now in described Dewar (1) is 4.2K;
Described dry pump (7) is opened when described first valve (4), described second valve (5) and described pressure maintaining valve (6) are in closed condition;
After described dry pump (7) running is stable, slowly open described first valve (4), the opening speed controlling described first valve (4) according to the reading of described Pressure gauge (2) is 3-5 minute/week;
When described first valve (4) is all opened and air pressure fall off rate in described Dewar (1) is 40-50kPa/h, slowly open described second valve (5), the air pressure in described Dewar (1) is finely tuned;
When temperature in described Dewar (1) drops to 2.0K, no longer continue to open described second valve (5), and open described pressure maintaining valve (6);
After the temperature stabilization in described Dewar (1) is 2.0K for.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310418835.4A CN103486794B (en) | 2013-09-13 | 2013-09-13 | A kind of Cryo Equipment for superconduction frequency stabilization oscillator and using method thereof |
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| CN201310418835.4A CN103486794B (en) | 2013-09-13 | 2013-09-13 | A kind of Cryo Equipment for superconduction frequency stabilization oscillator and using method thereof |
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| CN103486794B true CN103486794B (en) | 2015-11-18 |
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| CN106249771B (en) * | 2016-08-26 | 2023-06-16 | 无锡泓瑞航天科技有限公司 | Helium pressure tuner pressure precise control device and method |
| CN106972858B (en) * | 2017-04-01 | 2020-04-21 | 北京无线电计量测试研究所 | Sapphire microwave frequency source and control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4218892A (en) * | 1979-03-29 | 1980-08-26 | Nasa | Low cost cryostat |
| CN2255022Y (en) * | 1995-12-08 | 1997-05-28 | 中国科学院上海技术物理研究所 | Constant low temp. device with adjusting sample position function |
| WO2006002461A1 (en) * | 2004-07-05 | 2006-01-12 | Commonwealth Scientific And Industrial Research Organisation | Method and apparatus for operation of a cryogenic device in a gaseous environment |
| CN201846522U (en) * | 2010-10-29 | 2011-05-25 | 中国航天科工集团第二研究院二○三所 | Superconductor cavity for time frequency standard |
| CN102087065A (en) * | 2010-11-23 | 2011-06-08 | 北京航空航天大学 | Liquid helium external flow path system design for high pumping speed deep cooling system |
-
2013
- 2013-09-13 CN CN201310418835.4A patent/CN103486794B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4218892A (en) * | 1979-03-29 | 1980-08-26 | Nasa | Low cost cryostat |
| CN2255022Y (en) * | 1995-12-08 | 1997-05-28 | 中国科学院上海技术物理研究所 | Constant low temp. device with adjusting sample position function |
| WO2006002461A1 (en) * | 2004-07-05 | 2006-01-12 | Commonwealth Scientific And Industrial Research Organisation | Method and apparatus for operation of a cryogenic device in a gaseous environment |
| CN201846522U (en) * | 2010-10-29 | 2011-05-25 | 中国航天科工集团第二研究院二○三所 | Superconductor cavity for time frequency standard |
| CN102087065A (en) * | 2010-11-23 | 2011-06-08 | 北京航空航天大学 | Liquid helium external flow path system design for high pumping speed deep cooling system |
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Inventor after: Jia Zhenzhen Inventor after: Wang Nuanrang Inventor after: Cui Yongshun Inventor after: Yang Renfu Inventor after: Gao Lianshan Inventor after: Nian Feng Inventor before: Wang Nuanrang Inventor before: Cui Yongshun Inventor before: Yang Renfu Inventor before: Gao Lianshan Inventor before: Nian Feng |
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Effective date of registration: 20170829 Address after: 300450 Tianjin Binhai New Area six road No. 12 Building 1 Zirun court Gate No. 1102 Patentee after: Jia Zhenzhen Address before: 100854 Haidian District, Beijing, box 142, box office, 408 Patentee before: Beijing Radio Measuring and Testing Institute |
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