CN208076063U - A kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver - Google Patents
A kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver Download PDFInfo
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- CN208076063U CN208076063U CN201820486159.2U CN201820486159U CN208076063U CN 208076063 U CN208076063 U CN 208076063U CN 201820486159 U CN201820486159 U CN 201820486159U CN 208076063 U CN208076063 U CN 208076063U
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Abstract
The utility model provides a kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver comprising：Refrigeration machine has at least two cold heads；An at least confined space, plays the role of thermal switch；Microwave cavity is provided in the confined space, micrometeor compensation loop provides stable pressure environment for the microwave cavity, and the microwave resonance intracavitary is provided with fixed point component.Fixed point reproducing apparatus and benchmark temperature measuring equipment are coupled by the system, reduce transmission of quantity value link, reduced temperature drift is fundamentally prevented, increase resonant cavity thermal capacitance, so that fixed point precisely reproduction in situ is easier realization and temperature measurement accuracy can be improved, the multiple functions of device can be realized simultaneously the function that temperature indexing is measured with temperature, and then experimental cost and time cost are reduced, improve efficiency.
Description
Technical field
The utility model is related to a kind of temperature calibration system, especially a kind of temperature coupling fixed point using refrigeration machine as low-temperature receiver
Spend calibration system.
Background technology
Thermodynamic temperature is to weigh state parameter and international unit most basic in energy system and energy exchange processes
Make one of seven base units.The high precision of thermodynamic temperature is measured for front line science research, large scientific facilities operation, scientific research
The fields such as equipment preparation, national economy and hi-tech development have important scientific value and strategic importance.According to thermometric standard
For exactness from high to low, temperature magnitude traceability system can be divided into standard apparatus (temperature measurement uncertainty 1mK), standard set-up (thermometric
Uncertainty 3mK) and commercial Application device.Currently, establishing benchmark temperature measuring equipment, there are many methods, especially nearest proposed
Continuous pressure-controlled air inflation refractive index benchmark thermometric new method, innovative controlled with relative pressure substitute absolute pressure measurement, fundamentally
It solves to absolute pressure measurement accuracy dependency degree, the more existing method of theoretical precision improves 30%.In this method, it is related to ten
The measurement or accurately input of remaining kind of parameter, especially as the standard resistance thermometer of temperature comparisons' carrier, resistance v. temperature is special
Property be the key that determine reference level temp measuring system accuracy.
The indexing of the high accuracies thermometer such as standard platinum resistance thermometer mainly realizes that fixed point is by fixed point
There is reproducible equilibrium temperature point between Cucumber difference phase as defined in international temperature scale temperature value to determine, repdocutbility is good,
The high feature of accuracy is the important component of temperature scale.Traditional benchmark temperature measuring equipment and fixed point reproducing apparatus are independently
Operation, standard resistance thermometer are positioned over after calibration in benchmark temp measuring system, its resistance v. temperature is special over time
Property changes, and causes thermometer measure deviation, i.e. the resistance-temperature characteristics drifting problem of standard resistance thermometer；And it measures
Value transmits too many levels and causes new uncertain problem；And under new benchmark temp measuring method, there is also can not be accurate for system
The comparison for returning fixed point, cannot achieve thermal parameter in situ；In addition two covering devices are used, experimental cost is higher, due to two sets
Device cannot carry out experiment measurement to same benchmark temperature element simultaneously, and time-consuming relatively long, time cost is higher.
To sum up, it to realize the long-time high-acruracy survey of reference level temperature measuring equipment, and further cost-effective, improve effect
Fixed point and benchmark temperature measuring equipment can be coupled by rate, develop a kind of new temperature calibration device.
Utility model content
The purpose of this utility model is to solve the resistance v. temperature of the intrinsic standard resistance thermometer of traditional benchmark temperature measuring equipment
Characteristic drift problem, thermometric uncertain factor is more, cannot achieve thermal parameter in situ comparison, device is built and temperature measurement expense
It is relatively high, test the problems such as time-consuming, and efficiency is low.
The utility model provides a kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver comprising：System
Cold has at least two cold heads；An at least confined space, plays the role of thermal switch；It is arranged in the confined space
There are microwave cavity, micrometeor compensation loop to provide stable pressure environment for the microwave cavity, in the microwave resonance
Intracavitary is provided with fixed point component.
Wherein, the fixed point component is connected by coupling ties with microwave cavity.
Wherein, the coupling ties are including but not limited to structures such as cylinder, cuboid or polyhedrons.
Wherein, the fixed point component includes that multiple fixed points reappear unit.
Wherein, the working media of the thermal switch is the gases such as helium, neon, argon gas or nitrogen.
Wherein, an at least confined space includes the first confined space and the second confined space.
Wherein, the outer surface composition of zero level flange, the inner surface of hollow composite evacuated cover, two level flange and independent vacuum cylinder
First confined space.
Wherein, independent vacuum cylinder constitutes second confined space with two level flange.
Wherein, it is located in the pressure chamber including pressure chamber, the microwave cavity in second confined space.
Wherein, the microwave cavity is using geometries such as torispherical, cylinder or polyhedrons；The microwave resonance
The cavity material of chamber is the solid materials such as the nonmetallic materials such as metal materials or sapphire or superconductor such as oxygen-free high conductivity type copper,
Or the composite material of above-mentioned material composition.
The utility model provides a kind of temperature calibration system of new coupling fixed point, which, which reappears fixed point, fills
It sets and is coupled with benchmark temperature measuring equipment, reduce transmission of quantity value link, fundamentally prevented reduced temperature drift, increase humorous
It shakes chamber thermal capacitance, fixed point precisely reproduction in situ is made to be easier to realize, can be improved temperature measurement accuracy, the multiple functions of device can be with
The function that temperature indexing is measured with temperature is realized simultaneously, and then reduces experimental cost and time cost, improves efficiency.
Description of the drawings
Fig. 1 is the temperature calibration system schematic that the utility model couples fixed point using refrigeration machine as low-temperature receiver；
Fig. 2 is the coupling ties and fixed point component vertical view of the utility model.
Specific implementation mode
The embodiments of the present invention are illustrated below in conjunction with the accompanying drawings for the ease of understanding the utility model, ability
Field technique personnel should be appreciated that following explanations only to facilitate being explained to utility model, and not as to its range
Specific restriction.
The utility model provides a kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver, and Fig. 1 is this reality
With new device schematic diagram.As shown in Figure 1, the temperature calibration system for coupling fixed point using refrigeration machine as low-temperature receiver of the utility model
Including：Refrigeration machine 1, four-way valve 2, triple valve 3, zero level flange 4, hollow composite evacuated cover 5, level-one cold head 6, the compound thermal resistance of level-one
7, pressure-measuring pipe 8, level-one flexibility are thermally connected 9, the compound thermal resistance 10 of two level, level-one flange 11, level-one protective shield of radiation 12, two level cold head
13, the compound thermal resistance 14 of three-level, two level flexibility are thermally connected 15, the compound thermal resistance 16 of level Four, two level flange 17, independent vacuum cylinder 18, pressure
25, No. 1 power chamber 19, microwave cavity 20, microwave antenna 21, coupling ties 22, fixed point component 23, gas cylinder 24, cold-trap streams
Gauge 26, gas purification apparatus 27,28, No. 2 flowmeters 29 of backfeed loop, vacuum pump 30, piston manometer 31, fixed point reproduction
Unit 32, standard resistance thermometer 33, molecule pump group 34；Valve v1-v13.
In case study on implementation as shown in Figure 1, refrigeration machine 1 is low vibration vascular refrigerator, at least level-one cold head 6 and two
Grade 13 two cold heads of cold head, wherein level-one cold head 6 are connected with zero level flange 4 upwards, and level-one cold head 6 is compound with level-one successively downwards
Thermal resistance 7, level-one flexibility are thermally connected 9, the compound thermal resistance 10 of two level, level-one flange 11 is connected；Two level cold head 13 upwards with level-one flange
11 are connected, and two level cold head 13 is thermally connected 15, the compound thermal resistance of level Four 16, two with the compound thermal resistance 14 of three-level, two level flexibility successively downwards
Grade flange 17 is connected.9 and two level flexibility thermal connection 15 are thermally connected by the way that level-one flexibility is arranged, effectively solve the intrinsic machine of refrigeration machine
Tool vibrates, and reduces the vibration effect that gases cycle pressure oscillation in vascular causes tube wall deformation band；In addition, by compound
Thermal resistance 7,10,14,16 realizes that cold efficiently transmits jointly with cryocooler cold head 6,13, and can make refrigeration machine in whole process simultaneously
The fluctuation of cold head obtains effective attenuation, is that microwave cavity 20 builds a good low temperature environment with fixed point component 23.
In the implementation case, the inner surface of zero level flange 4 and hollow composite evacuated cover 5 is with two level flange 17 and independently true
The outer surface of empty cylinder 18 constitutes the first confined space.Hollow composite evacuated cover 5 is connected by clamp with zero level flange 4, described
Hollow composite evacuated cover 5 uses hollow design, effectively reduces chiller load weight, and 5 outermost layers of hollow composite evacuated cover are perseverance
Warm interlayer, it is ensured that the composite evacuated inner wall for covering 5 of vacuum has steady temperature, and the close inside of hollow composite evacuated cover 5 is with true
Dead level, the vacuum layer is connected with vacuum pump provides high vacuum environment, can substantially reduce its caused temperature fluctuation.
Level-one protective shield of radiation 12 is connected with level-one flange 11 by bolt, and level-one protective shield of radiation 12 uses hollow design,
Intermediate portion uses and is not limited to the engraved structures such as gold-plated radiation shield, aluminium foil cloth.Hollow, hollow out and gold-plated design, alleviate
Weight, effective uniform temperature field reduce heat transfer leakage heat and radiation leakage heat.Independent vacuum cylinder 18 constitutes second with two level flange 17
Confined space is bolted, and using gold-plated design, has special designing sealing structure, it can be achieved that disassembled and assembled freely and superelevation
Sealing performance.Pressure chamber 19 uses gold-plated design.First confined space and the second confined space constitute vacuum system together, for pressure
Power chamber 19 and microwave cavity 20 provide stable vacuum insulation environment, ensure that microwave cavity 20 and 23 temperature of fixed point component
Uniformity, the stability of field.
In case study on implementation as shown in Figure 1, the second confined space that two level flange 17 and independent vacuum cylinder 18 are constituted plays
The effect of " thermal switch ", by the aperture of control valve v13, to realize different open and close states, for " thermal switch "
It opens and closes.It is the open state of " thermal switch " when being filled with gas in independent vacuum cylinder 18, at this point, relying primarily on its internal work
The convection current for making gas achievees the purpose that heat exchange, quick using molecule pump group 34 if 20 temperature of microwave cavity reaches target temperature
Take the second confined space internal work medium away, that is, close " thermal switch ", to eliminate pressure chamber 19 and two level flange 17 and solely
Heat convection between vertical vacuum cylinder 18, the heating amount of only a small amount of radiation heat transfer, temperature-controlling system timely adjustment heater can be real
Now stable temperature control effect." thermal switch " working media is the gases such as helium, neon, argon gas, nitrogen, operating pressure covering 0~
10MPa.In conjunction with advanced Multi-point temperature-controlled algorithm, is realized in 5K-300K by the opening and closing of gas " thermal switch " and continuously may be used
The controlled heat environment of tune.
In case study on implementation as shown in Figure 1, pressure chamber 19, microwave cavity 20, pressure-measuring pipe 8, gas cylinder 24, cold-trap 25,1
Flowmeter 26, gas purification apparatus 27,30, No. 2 flowmeters 29 of vacuum pump, piston manometer 31 and backfeed loop 28 are constituted together
Micrometeor compensation loop, to provide pressure environment that is long-term, stablizing inside microwave cavity.
Using the cooling of double cold-trap 25, low temperature high-purity helium after purification, resonant cavity is entered by No. 1 control of flowmeter 26
Gas flow, pass through 30 dual regulation compensating flowrate of backfeed loop 28 and vacuum pump.The above measure can stablize pressure obtaining
While power, it can also make pressure chamber 19, pressure is equal everywhere in pressure-measuring pipe 8 and pressure control pipeline, avoids in gas thermometer
Existing pressure measurement pipeline shares dead space amendment caused by pressure, is provided for a long time surely for microwave cavity 20 and fixed point component
Fixed pressure.
In case study on implementation as shown in Figure 1, microwave cavity 20 is using including but not limited to geometry such as torispherical, cylinders
Structure can be successfully separated association pattern to improve frequency measurement accuracy, emit microwave by microwave antenna 21, measure resonance frequency
Rate finally obtains resonant frequency of the microwave cavity 20 under vacuum state and inflated condition, and torispherical microwave is humorous under the conditions of level pressure
The resonant frequency of chamber 20 of shaking and gas refracting index therein meet certain relational expression, and then obtain gas refracting index and thermodynamics
Temperature.20 material of microwave cavity including but not limited to nonmetallic materials such as the metal materials such as oxygen-free high conductivity type copper or sapphires or
The composite material of the solid materials such as superconductor and above-mentioned material composition.
In case study on implementation as shown in Figure 1, fixed point component 23 is connected by coupling ties 22 with microwave cavity 20
It connects, coupling ties 22 pass through bolt and microwave using the metal derby of high thermal conductivity coefficient including but not limited to oxygen-free high conductivity type copper block
20 bottom of resonant cavity is connected, and coupled mode is connected including but not limited to copper billet, and copper bar also can be used as coupling ties, incite somebody to action
Fixed point component 23 hangs on microwave cavity bottom.As shown in Fig. 2, being of coupled connections as coupling ties according to copper billet
It is interspaced in advance in part 22 for placing fixed point component 23, coupling ties are including but not limited to cylinder, cuboid, polyhedron
Etc. structure types；Fixed point component is not limited to placement location as shown in the figure and form, and vertical placement can be used, also can be used
It keeps flat or slant setting；23 form of fixed point component includes but is not limited to cylindrical, flat pie structure；Fixed point component 23
Be not limited to the reproduction of single fixed point, can include simultaneously that multiple single fixed points reappear units 32, for example, hydrogen, neon, oxygen,
The three-phase-point recurrence device of argon gas.At least one standard resistance thermometer 33, the standard platinum are installed on coupling ties 22
Resistance thermometer 33 can also be replaced by other conjunctions around fixed point reproduction unit setting, the standard resistance thermometer
Suitable thermometer or temperature element.When system reaches a certain set temperature of fixed point component, automated data acquisition system is adopted
Collect resistance thermometer in the related data of set temperature point, after handling collected data, obtains standard resistance thermometer temperature
With the correspondence of resistance, it can be achieved that indexing function to being detected temperature element；At a temperature of corresponding fixed point, it is carried out at the same time
Relevant parameter measures at a temperature of microwave frequency, the measurement of refractive index and fixed point in microwave cavity 20, and then avoids mark
Quasi- resistance thermometer temperature-resistance drifting problem reduces magnitude transmission link, realizes that thermal parameter compares in real time, realizes accurate
Thermometric.
Fixed point component and benchmark temperature measuring equipment are coupled by the utility model, realize the comparison of thermal parameter real-time in-situ；
Benchmark temperature measuring equipment is coupled with fixed point, effectively solves the problems, such as new uncertainty and standard caused by transmission of quantity value too many levels
Resistance thermometer resistance-temperature characteristics drifting problem, and it is precisely real in turn by using the thermal capacitance of coupling device increase resonant cavity
The in situ of existing fixed point returns, it can be achieved that temperature indexing and temperature measurement are carried out at the same time, and then realize the real-time right of thermal parameter
Than, while having the advantages that efficient, time cost is low etc.；Fixed point component reappears unit comprising multiple single fixed points simultaneously,
The different fixed points (hydrogen, neon, oxygen, argon etc.) of wide warm area (5K-300K) may be implemented to reappear, and then realize the height of entire temperature measuring equipment
Accuracy measurement.
It is understood that although the utility model has been disclosed in the preferred embodiments as above, above-described embodiment is not
To limit the utility model.For any person skilled in the art, the utility model technical side is not being departed from
Under case ambit, many possible variations all are made to technical solutions of the utility model using the technology contents of the disclosure above
And modification, or it is revised as the equivalent embodiment of equivalent variations.Therefore, every content without departing from technical solutions of the utility model,
According to the technical essence of the utility model any simple modifications, equivalents, and modifications made to the above embodiment, still belong to
In the range of technical solutions of the utility model protection.
Claims (10)
1. a kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver comprising：Refrigeration machine has at least two
Cold head；An at least confined space, plays the role of thermal switch；It is characterized in that：It is humorous it to be provided with microwave in the confined space
Shake chamber, and micrometeor compensation loop provides stable pressure environment for the microwave cavity, is arranged in the microwave resonance intracavitary
There is fixed point component.
2. temperature calibration system as described in claim 1, it is characterised in that：The fixed point component by coupling ties with
Microwave cavity is connected.
3. temperature calibration system as claimed in claim 2, it is characterised in that：The coupling ties are using cylinder, rectangular
Body or polyhedron.
4. temperature calibration system as claimed in claim 2, it is characterised in that：The fixed point component is multiple comprising multiple fixed points
Existing unit.
5. temperature calibration system as claimed in claim 2, it is characterised in that：The working media of the thermal switch is helium, neon
Gas, argon gas or nitrogen.
6. temperature calibration system as described in claim 1, it is characterised in that：An at least confined space includes first closed
Space and the second confined space.
7. temperature calibration system as claimed in claim 6, it is characterised in that：The interior table of zero level flange, hollow composite evacuated cover
The outer surface in face, two level flange and independent vacuum cylinder forms first confined space.
8. temperature calibration system as claimed in claim 6, it is characterised in that：Independent vacuum cylinder and two level flange constitute described the
Two confined spaces.
9. temperature calibration system as claimed in claim 8, it is characterised in that：Include pressure in second confined space
Chamber, the microwave cavity are located in the pressure chamber.
10. temperature calibration system as claimed in claim 9, it is characterised in that：The microwave cavity is using torispherical, cylinder
Shape or polyhedron；The cavity material of the microwave cavity is oxygen-free high conductivity type copper or sapphire or superconductor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820486159.2U CN208076063U (en) | 2018-04-08 | 2018-04-08 | A kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver |
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| CN201820486159.2U CN208076063U (en) | 2018-04-08 | 2018-04-08 | A kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318157A (en) * | 2018-04-08 | 2018-07-24 | 中国科学院理化技术研究所 | A kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver |
| CN113049144A (en) * | 2021-03-29 | 2021-06-29 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Heat insulation cavity for temperature measurement system to perform full-system-width low-temperature comprehensive calibration equipment |
-
2018
- 2018-04-08 CN CN201820486159.2U patent/CN208076063U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318157A (en) * | 2018-04-08 | 2018-07-24 | 中国科学院理化技术研究所 | A kind of temperature calibration system coupling fixed point using refrigeration machine as low-temperature receiver |
| CN113049144A (en) * | 2021-03-29 | 2021-06-29 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Heat insulation cavity for temperature measurement system to perform full-system-width low-temperature comprehensive calibration equipment |
| CN113049144B (en) * | 2021-03-29 | 2024-04-09 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Heat insulation cavity for full-system wide low-temperature comprehensive calibration equipment of temperature measurement system |
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