CN205449636U - Extremely low vibration helium cold -storage system - Google Patents
Extremely low vibration helium cold -storage system Download PDFInfo
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- CN205449636U CN205449636U CN201620207523.8U CN201620207523U CN205449636U CN 205449636 U CN205449636 U CN 205449636U CN 201620207523 U CN201620207523 U CN 201620207523U CN 205449636 U CN205449636 U CN 205449636U
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Abstract
The utility model relates to a cryogenic technique field, in particular to extremely low vibration helium cold -storage system, including helium chamber, refrigerator and the compressor continuous with the refrigerator, helium intracavity portion is the cavity form and forms the cavity that is used for holding the helium, and the one end in helium chamber links to each other with the cold head of refrigerator, and the other end links to each other with the sample mount pad, awaits measuring sample article fixed mounting on the sample mount pad. Through setting up the helium chamber, the back is shut down to the refrigerator, utilizes the low temperature helium in the helium chamber not influence the state by cooling sample temperature to the sample provides cold volume, and main vibration source disappears, vibration greatly reduced for stability by cooling sample position satisfies test requirement, simultaneously, this system use ordinary refrigerator can, need not to use the refrigerator of low vibration, also need not to adopt flexible heat transfer structure, greatly reduced the cost.
Description
Technical field
This utility model relates to cryogenic technique field, particularly to a kind of extremely low vibration helium cold accumulation system.
Background technology
Along with the development that deepens continuously of science and technology, under extreme condition, the scientific research (such as ultralow temperature, extremely low vibration condition) is increasingly paid attention to by scientific research personnel.Currently there are 4KG-M refrigeration machine and the pulse tube refrigerating machine of maturation, make to be cooled to sample 4.2K to compare use liquid helium and become simpler, but, no matter it is G-M refrigeration machine or pulse tube refrigerating machine, the vibration of self the most inevitably produces impact to the position of cooling sample, and these vibrations are typically derived from four aspects: (1) cryocooler cold head motor rotation brings vibration；(2) cryocooler cold head cylinder moves back and forth and brings vibration；(3) compressor operation brings vibration；(4) helium tube between compressor and cold head brings vibration owing to gas flows.Pulse tube refrigerating machine compares for G-M refrigeration machine, and owing to low temperature part does not has moving component, its vibration is relatively small.
Cryogenic target ball is carried out in the inertial confinement fusion system of phase contrast sign using X-ray, require that cryogenic target ball position stability is the least at 1 micron, if using G-M refrigeration machine or pulse tube refrigerating machine that cryogenic target ball is lowered the temperature, it is impossible to reach the lowest amplitude requirement.In order to avoid the problems referred to above, existing way typically has two kinds: one, uses flexible heat transfer structure, the refrigeration machine of customization suitable construction, reduces the refrigeration machine vibration impact on target ball position stability；Its two, use the refrigeration machine less than G-M refrigeration machine and pulse tube refrigeration machine vibration, such as J-T circulating refrigerator or dense-air refrigeration cycle refrigeration machine.Above in a scheme, Custom Prosthesis refrigeration machine and flexible heat transfer structure can bring being significantly increased of cost；In latter approach, the price of J-T circulating refrigerator or dense-air refrigeration cycle refrigeration machine is the highest, also results in the increase of system cost.
Utility model content
Primary and foremost purpose of the present utility model is to provide a kind of extremely low vibration helium cold accumulation system, meets the sample detection under extremely low vibration demand.
For realizing object above, the technical solution adopted in the utility model is: a kind of extremely low vibration helium cold accumulation system, including helium chamber, refrigeration machine and the compressor being connected with refrigeration machine；Described helium intracavity portion is the chamber that hollow form forms for accommodating helium, and the one end in helium chamber is connected with the cold head of refrigeration machine, and the other end is connected with sample mounting seat, and sample to be tested is fixedly mounted in sample mounting seat.
Further, including the chamber in gas tube, one end of gas tube and helium chamber, the other end is connected with high-pure helium gas cylinder by air relief valve or is connected by the pipeline between flow regulator with refrigeration machine and compressor.
Further, described refrigeration machine includes one-level cold head and two grades of cold heads, and helium chamber is connected with two grades of cold heads；Described gas tube is stainless steel tube, and gas tube is arranged along the heat exchanger of one-level cold head and is connected with helium chamber after the cylinder multi-turn of two grades of cold heads again.
Further, described helium chamber includes cylindrical helium chamber body, and the two ends of helium chamber body are sealed by blind cover and form described chamber, and helium chamber body and blind cover are oxygen-free copper material and make；One of them blind cover is fixing with two grades of cold heads of refrigeration machine to be connected, and sample mounting seat is fixed in another blind cover by thermal resistance pad.
Further, described sample mounting seat is provided with the first film heater for the temperature of sample is controlled, two grades of cold heads is provided with the second thin film heater for regulating refrigerating capacity；Being additionally provided with temperature sensor in described sample mounting seat, control unit controls the work of the first film heater after receiving actual temperature information that temperature sensor collects and actual temperature being contrasted with design temperature.
Further, the other end of described gas tube is connected with high-pure helium gas cylinder by air relief valve；One-level cold head is provided with the first adpting flange away from one end of two grades of cold heads, two grades of cold heads, helium chamber, sample mounting seat and sample outer sheath are provided with the first protective shield of radiation, outside one-level cold head and the first protective shield of radiation, wrapping has one side metallized film, one side metallized film outer sheath is provided with shell, and shell is the barreled of one end open and its open at one end is fixed on the first adpting flange.
Further, the other end of described gas tube is connected by the pipeline between flow regulator with refrigeration machine and compressor；Two grades of cold heads are provided with the second adpting flange near one end of one-level cold head, two grades of cold heads, helium chamber, sample mounting seat and sample outer sheath are provided with the second protective shield of radiation, second protective shield of radiation is fixed on the second adpting flange, and flow regulator, refrigeration machine and the second protective shield of radiation are placed in thermostat.
Further, the gas tube being connected with high-pure helium gas cylinder is postponed on the heat exchanger of one-level cold head by the first adpting flange after sequentially passing through air relief valve, effusion meter, pressure transmitter, relief valve；Control unit controls safety valve action after gathering effusion meter, the information of pressure transmitter output and processing.
Compared with prior art; there is techniques below effect in this utility model: by arranging helium chamber, after refrigeration machine is shut down, utilizes the low-temperature helium in helium chamber to provide cold not affect cooled sample temperature state to sample; main vibration source disappears; vibration is substantially reduced so that the stability of cooled sample position meets test request, simultaneously; this system uses common refrigeration machine; without using the refrigeration machine of low vibration, without using flexible heat transfer structure, greatly reduce cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model embodiment one, and wherein more due to line, in figure, the annexation of first and second thin film heater and temperature sensor and control unit is not shown；
Fig. 2 is the structural representation of this utility model embodiment two, wherein eliminates the line of control unit and control unit and miscellaneous part.
Detailed description of the invention
Below in conjunction with Fig. 1 to Fig. 2, this utility model is described in further detail.
Refering to Fig. 1, Fig. 2, a kind of extremely low vibration helium cold accumulation system, including helium chamber 10, refrigeration machine 20 and the compressor 30 being connected with refrigeration machine 20；The internal chamber formed in hollow form for accommodating helium in described helium chamber 10, the one end in helium chamber 10 is connected with the cold head of refrigeration machine 20, and the other end is connected with sample mounting seat 41, and sample 42 to be tested is fixedly mounted in sample mounting seat 41.Here by arranging helium chamber 10; helium chamber 10 accommodates helium; first helium in helium chamber 10 is cooled down by refrigeration machine 20, when, after helium gas cooling to design temperature, being shut down by refrigeration machine 20; logical overcooled helium is treated test sample 42 and is cooled down; sample 42 to be tested is made to meet extremely low temperature when testing, simultaneously as refrigeration machine 20 has been shut down; primary oscillation source has been removed, and sample 42 to be tested ensure that when detection displacement is stable in 1 micrometer range.The more important thing is, here without the J-T circulating refrigerator that use extremely low vibration, cost is high or dense-air refrigeration cycle refrigeration machine, cost also can be well controlled.
The most why helium chamber 10 is set, accommodates helium in it as cooling medium, be primarily due at 4-10K warm area, the specific heat ratio overwhelming majority material of high-purity helium will be high, therefore comparing other materials of selection, the amount of helium of use is the least, thus alleviates weight of equipment.As a example by copper, the helium of 6K specific heat under the conditions of 15atm is 3.914 × 103J/Kg K, and the specific heat that heat conductivility preferable material fine copper is when 6K is only 0.091J/Kg K, when needing the bi-material of identical cold-storage ability, the quality of required copper will be 10,000 times of liquid helium quality, and therefore, selecting helium is extraordinary as cooling medium.
As preferred version of the present utility model, including gas tube 61, one end of gas tube 61 and the chamber in helium chamber 10, the other end is connected with high-pure helium gas cylinder 66 by air relief valve 65 or is connected by the pipeline between flow regulator 67 with refrigeration machine 20 and compressor 30.Owing to the circulatory mediator of refrigeration machine 20 itself is exactly helium, therefore the helium in native system has two ways to obtain: embodiment one is as it is shown in figure 1, helium is obtained by high-pure helium gas cylinder 66, and the helium pressure in helium chamber 10 is regulated by air relief valve；Embodiment two is as in figure 2 it is shown, helium is obtained by the blood circulation of refrigeration machine 20 self, and the helium pressure in helium chamber 10 is regulated by flow regulator 67.In embodiment one, flow, pressure for helium can be controlled easily, but system is more relative complex；For embodiment two, helium obtains convenient, it is not necessary to increase other extra sources of the gas and pipeline, and system is easy.Time the most specifically used, user can select suitable embodiment according to the selection of oneself.
Preferably, described refrigeration machine 20 includes one-level cold head 21 and two grades of cold heads 22, and helium chamber 10 is connected with two grades of cold heads 22；Described gas tube 61 is stainless steel tube, and gas tube 61 is arranged along the heat exchanger of one-level cold head 21 and is connected with helium chamber 10 after the cylinder multi-turn of two grades of cold heads 22 again.Refrigeration machine 20 includes two-stage cold head, to the cooling effect of helium more preferably.The heat exchanger of one-level cold head 21 is arranged gas tube 61, make helium first pass through be arranged on refrigeration machine 20 one-level cold head with slype oxygen-free copper heat exchanger, utilize refrigeration machine 20 one-level cold head 21 that high-purity helium pre-cooling is lowered the temperature, to reduce the heat load of two grades of cold heads 22, thus improve rate of temperature fall and inflation rate.Gas tube 61 is to increase pipeline flexible around the purpose of multi-turn on two grades of cold heads 22, compensates low-temperature shrink.
Further, described helium chamber 10 includes cylindrical helium chamber body 11, the two ends of helium chamber body 11 are sealed by blind cover 12 and form described chamber, helium chamber body 11 and blind cover 12 are oxygen-free copper material and make, the thermal conductivity of oxygen-free copper is the highest, and here there are two effects in helium chamber 10, on the one hand as cold Transfer Medium, two grades of cold head 22 colds of refrigeration machine 20 are passed to sample mounting seat 41, on the other hand stores high pressure, high purity helium as a container.Selecting major diameter copper pipe is that blind cover 12 is welded on the two ends in helium chamber 10 by electron beam in order to strengthen helium heat-transfer area as the purpose in helium chamber 10.In blind cover 12 cavity side towards helium chamber 10 arrange some copper pipes with ensure helium and the heat transfer area in helium chamber 10 and the ratio of helium chamber 10 gross area more than 0.68, so preferable to the cooling effect of sample mounting seat 41.
Further, one of them blind cover 12 is fixing with two grades of cold heads 22 of refrigeration machine 20 to be connected, sample mounting seat 41 is fixed in another blind cover 12 by thermal resistance pad 43, arranges thermal resistance pad 43 so that the temperature of sample mounting seat 41 will not be the fastest along with the variations in temperature in helium chamber 10.Thermal resistance pad 43 can make of latten(-tin) in uniform thickness, and the thickness of latten(-tin) is configured according to practical situation.
In order to realize treating the accurate control of test sample 42 temperature, it is provided with the first film heater 411 in described sample mounting seat 41, helium chamber 10 can be treated test sample 42 and be lowered the temperature, the first film heater 411 can be treated test sample 42 and heat, and thus can maintain sample 42 to be tested as required in the temperature set.Further, it is contemplated that the refrigerating capacity of refrigeration machine 20 is different, two grades of cold heads 22 are provided with the second thin film heater 221 for regulating refrigerating capacity.It is additionally provided with temperature sensor 412 in described sample mounting seat 41, control unit 50 controls the first film heater 411 after receiving actual temperature information that temperature sensor 412 collects and actual temperature being contrasted with design temperature and works, after temperature sensor 412 is set, the temperature that just can treat test sample 42 is monitored, and facilitates and follow-up carries out being automatically adjusted of temperature.
It addition, when there is a need to simulate heat load, a thin film heater can be arranged on sample 42 to be tested, treating test sample 42 and heat.Temperature sensor can also be respectively provided with at the two ends of 21, two grades of cold heads 22 of refrigeration machine one-level cold head and helium chamber 10, be used for monitoring each point temperature value.Wherein, on two ends, helium chamber 10 and sample mounting seat 41 temperature sensor can try out demarcation cernox temperature sensor because its certainty of measurement is high, can reach ± 5mK, remaining uses standard silicon diode temperature sensor, and its certainty of measurement is ± 0.25K.Certainly user can also arrange temperature sensor in other positions as required or arrange thin film heater, and the most just differ a citing.
Preferably, in embodiment one, the other end of described gas tube 61 is connected with high-pure helium gas cylinder 66 by air relief valve 65；One-level cold head 21 is provided with the first adpting flange 23 away from one end of two grades of cold heads 22, two grades of cold heads 22, helium chamber 10, sample mounting seat 41 and sample 42 outer sheath are provided with the first protective shield of radiation 71, outside one-level cold head 21 and the first protective shield of radiation 71, wrapping has one side metallized film, one side metallized film outer sheath is provided with shell 80, and the shell 80 barreled in one end open and its open at one end are fixed on the first adpting flange 23.First protective shield of radiation 71 can use copper product to make, the first protective shield of radiation 71, one side metallized film and the setting of shell 80, is provided to ensure the radiation leakage heat in helium chamber 10.
In embodiment two, have employed another mode and leak heat to the radiation ensureing helium chamber 10, concrete structure is as follows: the other end of described gas tube 61 is connected by the pipeline between flow regulator 67 with refrigeration machine 20 and compressor 30；Two grades of cold heads 22 are provided with the second adpting flange 24 near one end of one-level cold head 21, two grades of cold heads 22, helium chamber 10, sample mounting seat 41 and sample 42 outer sheath are provided with the second protective shield of radiation 72, second protective shield of radiation 72 is fixed on the second adpting flange 24, and flow regulator 67, refrigeration machine 20 and the second protective shield of radiation 72 are placed in thermostat 90.It should be noted that; here protective shield of radiation, one side metallized film, shell, thermostat can select to use according to practical situation; could be used that the structure in embodiment one in embodiment two, as long as after ensureing that refrigeration machine 20 is shut down, the helium in helium chamber 10 is low with extraneous heat exchange.
In embodiment one preferably, the gas tube 61 being connected with high-pure helium gas cylinder 66 is postponed on the heat exchanger of one-level cold head 21 by the first adpting flange 23 after sequentially passing through air relief valve 65, effusion meter 64, pressure transmitter 63, relief valve 62；Control unit 50 controls relief valve 62 action after gathering effusion meter 64, the information of pressure transmitter 63 output and processing.After control unit 50 gathers the information of effusion meter 64, in that context it may be convenient to gather flow, and startup relief valve 62 when flow occurs abnormal can be worked as, system is protected.
This utility model additionally provides the control method of a kind of extremely low vibration helium cold accumulation system, comprises the steps: that detected sample 42 is placed in sample mounting seat 41 by (A)；(B) start refrigeration machine 20, the helium in helium chamber 10 is cooled down, until closing refrigeration machine 20 after design temperature；(C) sample 42 is maintained at a predetermined temperature by the low-temperature helium in helium chamber 10, completes sample 42 simultaneously and detects.In this step, by timesharing start and stop refrigeration machine 20, the when that i.e. refrigeration machine 20 cooling down, do not carry out the detection of sample 42 to be tested, when detected sample 42 is detected, do not start refrigeration machine 20, thus can meet low vibration demand during test.In step B, design temperature can be the acceptable minimum temperature of sample 42 to be tested.
Preferably, in described step B, the helium in helium chamber 10 can obtain from the blood circulation of refrigeration machine 20 itself, it is also possible to obtains from independent helium tank, elaboration the most detailed before this, the most just repeats no more.In described step C; temperature is monitored simultaneously; if the temperature collected is higher than predetermined temperature; illustrate that temperature now is higher; it is unsatisfactory for the detection demand of sample 42 to be tested; then suspend detection and repeat step B, continuing to detect shutting down again after the helium gas cooling in helium chamber 10 to design temperature.
Claims (8)
1. an extremely low vibration helium cold accumulation system, it is characterised in that: include helium chamber (10), refrigeration machine (20) and the compressor (30) being connected with refrigeration machine (20)；The internal chamber formed in hollow form for accommodating helium of described helium chamber (10), the one end in helium chamber (10) is connected with the cold head of refrigeration machine (20), the other end is connected with sample mounting seat (41), and sample to be tested (42) is fixedly mounted in sample mounting seat (41).
Extremely low vibration helium cold accumulation system the most as claimed in claim 1, it is characterized in that: include gas tube (61), one end of gas tube (61) and the chamber in helium chamber (10), the other end is connected with high-pure helium gas cylinder (66) by air relief valve (65) or is connected by the pipeline between flow regulator (67) with refrigeration machine (20) and compressor (30).
Extremely low vibration helium cold accumulation system the most as claimed in claim 2, it is characterized in that: described refrigeration machine (20) includes one-level cold head (21) and two grades of cold heads (22), helium chamber (10) are connected with two grades of cold heads (22)；Described gas tube (61) is stainless steel tube, and gas tube (61) is arranged along the heat exchanger of one-level cold head (21) and is connected with helium chamber (10) after the cylinder multi-turn of two grades of cold heads (22) again.
Extremely low vibration helium cold accumulation system the most as claimed in claim 3, it is characterized in that: described helium chamber (10) includes cylindrical helium chamber body (11), the two ends in helium chamber body (11) are sealed by blind cover (12) and form described chamber, and helium chamber body (11) and blind cover (12) are oxygen-free copper material and make；One of them blind cover (12) is fixing with two grades of cold heads (22) of refrigeration machine (20) to be connected, and sample mounting seat (41) is fixed in another blind cover (12) by thermal resistance pad (43).
Extremely low vibration helium cold accumulation system the most as claimed in claim 4, it is characterized in that: be provided with the first film heater (411) in described sample mounting seat (41) and be used for the temperature of sample (42) is controlled, two grades of cold heads (22) are provided with the second thin film heater (221) and are used for regulating refrigerating capacity；Being additionally provided with temperature sensor (412) in described sample mounting seat (41), control unit (50) controls the first film heater (411) work after receiving actual temperature information that temperature sensor (412) collects and actual temperature being contrasted with design temperature.
Extremely low vibration helium cold accumulation system the most as claimed in claim 5, it is characterised in that: the other end of described gas tube (61) is connected with high-pure helium gas cylinder (66) by air relief valve (65)；One-level cold head (21) is provided with the first adpting flange (23) away from one end of two grades of cold heads (22), two grades of cold heads (22), helium chamber (10), sample mounting seat (41) and sample (42) outer sheath are provided with the first protective shield of radiation (71), one-level cold head (21) and the wrapping of the first protective shield of radiation (71) outside have one side metallized film, one side metallized film outer sheath is provided with shell (80), and the shell (80) barreled in one end open and its open at one end are fixed on the first adpting flange (23).
Extremely low vibration helium cold accumulation system the most as claimed in claim 5, it is characterised in that: the other end of described gas tube (61) is connected by the pipeline between flow regulator (67) with refrigeration machine (20) and compressor (30)；Two grades of cold heads (22) are provided with the second adpting flange (24) near one end of one-level cold head (21), two grades of cold heads (22), helium chamber (10), sample mounting seat (41) and sample (42) outer sheath are provided with the second protective shield of radiation (72), second protective shield of radiation (72) is fixed on the second adpting flange (24), and flow regulator (67), refrigeration machine (20) and the second protective shield of radiation (72) are placed in thermostat (90).
Extremely low vibration helium cold accumulation system the most as claimed in claim 6, it is characterised in that: the gas tube (61) being connected with high-pure helium gas cylinder (66) is sequentially passed through air relief valve (65), effusion meter (64), pressure transmitter (63), relief valve (62) and is postponed on the heat exchanger of one-level cold head (21) by the first adpting flange (23) afterwards；Control unit (50) gather effusion meter (64), the information that exports of pressure transmitter (63) and process after control relief valve (62) action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620207523.8U CN205449636U (en) | 2016-03-16 | 2016-03-16 | Extremely low vibration helium cold -storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620207523.8U CN205449636U (en) | 2016-03-16 | 2016-03-16 | Extremely low vibration helium cold -storage system |
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| CN205449636U true CN205449636U (en) | 2016-08-10 |
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| CN201620207523.8U Withdrawn - After Issue CN205449636U (en) | 2016-03-16 | 2016-03-16 | Extremely low vibration helium cold -storage system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675381A (en) * | 2016-03-16 | 2016-06-15 | 安徽万瑞冷电科技有限公司 | Super-low-vibration helium cold accumulation system and control method thereof |
| CN107560958A (en) * | 2017-09-25 | 2018-01-09 | 清华大学 | The ultralow vibration friction testing arrangement of ultralow temperature |
| CN110132791A (en) * | 2019-05-17 | 2019-08-16 | 杭州仰仪科技有限公司 | Liquid cryogen fluidity testing conduction cooling vibration isolation sample container |
| CN110967258A (en) * | 2019-11-18 | 2020-04-07 | 探普(南京)工业科技有限公司 | Liquid nitrogen-free high-low temperature tensile test device |
| CN112557577A (en) * | 2020-10-22 | 2021-03-26 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | System for testing dynamic performance of catalytic conversion of para-hydrogen |
-
2016
- 2016-03-16 CN CN201620207523.8U patent/CN205449636U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105675381A (en) * | 2016-03-16 | 2016-06-15 | 安徽万瑞冷电科技有限公司 | Super-low-vibration helium cold accumulation system and control method thereof |
| CN105675381B (en) * | 2016-03-16 | 2018-05-22 | 安徽万瑞冷电科技有限公司 | Extremely low vibration helium cold accumulation system |
| CN107560958A (en) * | 2017-09-25 | 2018-01-09 | 清华大学 | The ultralow vibration friction testing arrangement of ultralow temperature |
| CN110132791A (en) * | 2019-05-17 | 2019-08-16 | 杭州仰仪科技有限公司 | Liquid cryogen fluidity testing conduction cooling vibration isolation sample container |
| CN110132791B (en) * | 2019-05-17 | 2021-11-26 | 杭州仰仪科技有限公司 | Cold-conducting vibration-isolating sample container for testing low-temperature fluidity of liquid |
| CN110967258A (en) * | 2019-11-18 | 2020-04-07 | 探普(南京)工业科技有限公司 | Liquid nitrogen-free high-low temperature tensile test device |
| CN112557577A (en) * | 2020-10-22 | 2021-03-26 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | System for testing dynamic performance of catalytic conversion of para-hydrogen |
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