CN214333095U - Stirling refrigerator and device for measuring refrigerating capacity thereof - Google Patents
Stirling refrigerator and device for measuring refrigerating capacity thereof Download PDFInfo
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- CN214333095U CN214333095U CN202022870928.9U CN202022870928U CN214333095U CN 214333095 U CN214333095 U CN 214333095U CN 202022870928 U CN202022870928 U CN 202022870928U CN 214333095 U CN214333095 U CN 214333095U
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Abstract
The utility model relates to a refrigerator technical field provides a measuring device of stirling refrigerator's refrigerating output, including being used for maintaining the temperature of refrigerator cold head at 77K's heating plate and being used for measuring the measuring component of the temperature of refrigerator cold head, measuring component is including the diode of the dewar of connecting the refrigerator and measuring the universal meter of diode. The utility model discloses a measuring device of stirling refrigerator's refrigerating output has realized the accurate measurement of the refrigerating output of refrigerator through the cooperation of heating plate, diode and universal meter.
Description
Technical Field
The utility model relates to a refrigerator technical field specifically is a stirling refrigerator and measuring device of refrigerating output thereof.
Background
The rotary integral Stirling refrigerator is an active refrigerating device adopting reverse Stirling circulation, the refrigerator is driven by a rotary motor, and a compressor and an expander are integrated into a whole, so that the rotary integral Stirling refrigerator has the structural advantages of small volume, light weight and the like. The rotary integral Stirling refrigerator is used as a cold source of low-temperature electronic devices, superconducting devices, infrared detectors and the like, and is widely applied to civil and military equipment such as thermal infrared imagers, infrared night vision, missile guidance and the like.
The refrigerating capacity of the refrigerating machine at 77K is an important evaluation index of the refrigerating capacity of the refrigerating machine, but the refrigerating capacity is difficult to directly and accurately measure because the cold head of the refrigerating machine is positioned in the vacuum environment of a Dewar.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a measuring device of stirling refrigerator's refrigerating output has realized the accurate measurement of refrigerating output.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: the measuring device for the refrigerating capacity of the Stirling refrigerator comprises a heating sheet for maintaining the temperature of a cold head of the refrigerator at 77K and a measuring assembly for measuring the temperature of the cold head of the refrigerator, wherein the measuring assembly comprises a diode connected with a Dewar of the refrigerator and a multimeter for measuring the diode.
Further, still include the power supply subassembly that is used for giving the heating plate power supply.
Furthermore, the power supply assembly comprises a double-channel direct-current stabilized power supply, one channel of the double-channel direct-current stabilized power supply is electrically connected with the heating plate, and the other channel of the double-channel direct-current stabilized power supply is electrically connected with the refrigerating machine.
Further, the heating plate is a platinum resistor of 100 Ω.
Further, the diode is a 2N2222 type temperature measuring diode.
The embodiment of the utility model provides another kind of technical scheme: a Stirling refrigerator comprises the device for measuring the refrigerating capacity of the Stirling refrigerator.
Further, still include the dewar, the heating plate with the diode all encapsulates on the cold dish of dewar.
Furthermore, the Dewar is vacuum-packaged, and the internal vacuum degree is 10-5Pa～10-4Pa is between Pa.
Further, a rotary motor for driving the refrigerator to rotate is also included.
Further, the system comprises a compressor and an expander which are integrated into a whole.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a measuring device of refrigerating output of stirling refrigerator, has realized the accurate measurement of refrigerating output of refrigerator through the cooperation of heating plate, diode and universal meter.
Drawings
Fig. 1 is a schematic diagram of a device for measuring the refrigerating capacity of a stirling cryocooler according to an embodiment of the present invention;
in the reference symbols: 1-a refrigerator; 2-Dewar; 3-heating a sheet; 4-a diode; 5-two-channel direct current stabilized power supply; 6-multimeter.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a device for measuring a refrigerating capacity of a stirling cryocooler, including a heating plate 3 for maintaining a temperature of a cold head of the cryocooler at 77K and a measuring assembly for measuring the temperature of the cold head of the cryocooler, where the measuring assembly includes a diode 4 connected to a dewar 2 of the cryocooler and a multimeter 6 for measuring the diode 4. In this embodiment, the dewar has a cold loss Q at a certain ambient temperaturedIs constant by applying a suitable operating voltage U to the heating plate 3rWherein the resistance of the heating plate 3 is R, and the temperature of the cold head can be stabilized after the working voltage is addedThe acquisition formula of the 77K refrigerating capacity of the refrigerator 1 can be obtained according to the energy balance equation and is determined to be near 77K (Kelvin)
Wherein the resistance R of the heating sheet 3 is a fixed value, and the cold loss Q isdIs a constant value, providing a working voltage UrIt is also known that the refrigerating capacity Q of the refrigerating machine 1 can thus be precisely obtainedc. In this case, the temperature of the dewar cold head is monitored by the diode 4 and the multimeter 6, specifically, the shift of the multimeter 6 is first switched to the shift of the diode 4, and when the temperature of the diode 4 is lower than 77K, the appropriate voltage is applied to the heating sheet 3, and the heating sheet 3 stabilizes the temperature of the diode 4 at 77K after the cold head is heated. It should be noted that the cooling capacity measured in this embodiment is related to the ambient temperature, and therefore, the specific ambient temperature needs to be measured first, and the cooling loss of the dewar 2 when the cold head temperature is 77K, and then the cooling capacity of the ambient temperature refrigerator 1 at 77K needs to be measured, so that the cooling capacity of the refrigerator 1 at different operating temperatures can also be measured through the specific ambient temperature and the cooling loss of the dewar 2 at different cold head temperatures.
The following are specific examples:
as an optimized solution of the embodiment of the present invention, please refer to fig. 1, the measuring device further includes a power supply assembly for supplying power to the heating plate 3. In the present embodiment, a special power supply assembly is used to continuously supply power to the heating plate 3, so that the temperature of the diode 4 can be stabilized at 77K after the cold head heats up.
In order to further optimize the above solution, referring to fig. 1, the power supply assembly includes a dual-channel regulated dc power supply 5, one channel of the dual-channel regulated dc power supply 5 is electrically connected to the heating plate 3, and the other channel is electrically connected to the refrigerator 1. In this embodiment, the power supply may be a dual-channel dc regulated power supply 5, which has two channels, one of which can provide voltage to the heating plate 3 and the other can provide driving voltage to the refrigerator 1. When the cold head cooling device is used, one of the channels is set, for example, the voltage of the channel 2 is set to be the rated constant voltage of the refrigerator 1, the power channel 2 is opened, the refrigerator 1 is enabled to work in an open loop mode, in the power supply range of the refrigerator 1, the power supply voltage can be increased or reduced, and the cooling rate of the cold head can be accelerated or slowed down. Then, the temperature of the cold head of the Dewar is monitored through the universal meter 6, when the temperature of the diode 4 is lower than 77K, the power supply channel 1 is opened to provide proper voltage for the heating sheet 3, and the temperature of the diode 4 can be stabilized at 77K after the heating sheet 3 heats at the cold head. Of course, the channel 1 and the channel 2 can be used interchangeably, and this embodiment does not limit this. Besides the dual-channel dc regulated power supply 5, a power supply form such as a multi-power supply or a multi-channel power supply may be used.
As an optimized solution of the embodiment of the present invention, the heating sheet 3 is a platinum resistor of 100 Ω. In this embodiment, the heating sheet 3 may be a platinum resistor with a resistance of 100 ohms, and other existing products that can meet the requirements may be used instead of the platinum resistor, which is not limited in this embodiment.
As the embodiment of the utility model provides an optimization scheme, diode 4 is 2N2222 type temperature diode 4. In this embodiment, the diode 4 is a temperature measuring diode 4 with a model number of 2N2222, and other existing products that can meet the requirements may be used instead of the temperature measuring diode 4, which is not limited in this embodiment.
The embodiment of the utility model provides a stirling refrigerator 1, including foretell stirling refrigerator 1's the measuring device of refrigerating output. In the present embodiment, the cooling capacity of the stirling cooler 1 can be accurately obtained by using the above-described measurement device in the conventional stirling cooler 1. In particular, the dewar has a cold loss Q at a certain ambient temperaturedIs constant by applying a suitable operating voltage U to the heating plate 3rWherein the resistance of the heating plate 3 is R, the temperature of the cold head can be stabilized near 77K (Kelvin) after the working voltage is added, and the acquisition formula of the 77K refrigerating capacity of the refrigerator 1 can be obtained according to the energy balance equation
Wherein the resistance R of the heating sheet 3 is a fixed value, and the cold loss Q isdIs a constant value, providing a working voltage UrAre also known, thereforeThe refrigerating capacity Q of the refrigerating machine 1 can be accurately obtainedc. In this case, the temperature of the dewar cold head is monitored by the diode 4 and the multimeter 6, specifically, the shift of the multimeter 6 is first switched to the shift of the diode 4, and when the temperature of the diode 4 is lower than 77K, the appropriate voltage is applied to the heating sheet 3, and the heating sheet 3 stabilizes the temperature of the diode 4 at 77K after the cold head is heated. It should be noted that the cooling capacity measured in this embodiment is related to the ambient temperature, and therefore, the specific ambient temperature needs to be measured first, and the cooling loss of the dewar 2 when the cold head temperature is 77K, and then the cooling capacity of the ambient temperature refrigerator 1 at 77K needs to be measured, so that the cooling capacity of the refrigerator 1 at different operating temperatures can also be measured through the specific ambient temperature and the cooling loss of the dewar 2 at different cold head temperatures.
As an optimized solution of the embodiment of the present invention, please refer to fig. 1, the refrigerator 1 further includes a dewar 2, and the heating plate 3 and the diode 4 are all packaged on the cooling plate of the dewar 2. The Dewar 2 is vacuum-packaged, and the internal vacuum degree is 10-5Pa～10-4Pa is between Pa. In this embodiment, the heating plate 3 and the diode 4 are packaged on a dewar 2 cold plate, and the dewar 2 realizes heat insulation through high vacuum packaging, and the internal vacuum degree is about 10-5Pa～10-4Pa, detecting that the cold loss (@77K) of Dewar 2 at specific ambient temperature is Qd。
As an optimized solution of the embodiment of the present invention, please refer to fig. 1, the refrigerator 1 further includes a rotating electrical machine for driving the refrigerator 1 to rotate, and a compressor and an expander integrated together. In this embodiment, the present refrigerator 1 is a rotary integrated stirling refrigerator 1, which includes a compressor and an expander.
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. A measurement device of refrigerating output of a Stirling refrigerator is characterized in that: the refrigerator cold head temperature measuring device comprises a heating sheet for maintaining the temperature of the cold head of the refrigerator at 77K and a measuring assembly for measuring the temperature of the cold head of the refrigerator, wherein the measuring assembly comprises a diode connected with a Dewar of the refrigerator and a multimeter for measuring the diode.
2. A cooling capacity measuring apparatus of a stirling cooler according to claim 1, wherein: the heating plate is characterized by also comprising a power supply assembly for supplying power to the heating plate.
3. A cooling capacity measuring apparatus of a stirling cooler according to claim 2, wherein: the power supply assembly comprises a double-channel direct-current stabilized power supply, one channel of the double-channel direct-current stabilized power supply is electrically connected with the heating plate, and the other channel of the double-channel direct-current stabilized power supply is electrically connected with the refrigerating machine.
4. A cooling capacity measuring apparatus of a stirling cooler according to claim 1, wherein: the heating plate is a 100 omega platinum resistor.
5. A cooling capacity measuring apparatus of a stirling cooler according to claim 1, wherein: the diode is a 2N2222 type temperature measuring diode.
6. A stirling cooler, comprising: a device for measuring the refrigerating capacity of a stirling cooler comprising a stirling cooler as claimed in any one of claims 1 to 5.
7. A stirling cooler according to claim 6, wherein: still include the dewar, the heating plate with the diode all encapsulates on the cold dish of dewar.
8. A stirling cooler according to claim 7, wherein: the inside of the Dewar is vacuum-packaged, and the internal vacuum degree is 10-5Pa～10-4Pa is between Pa.
9. A stirling cooler according to claim 6, wherein: and a rotary motor for driving the refrigerating machine to rotate.
10. A stirling cooler according to claim 6, wherein: also included are integrated compressors and expanders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022870928.9U CN214333095U (en) | 2020-12-04 | 2020-12-04 | Stirling refrigerator and device for measuring refrigerating capacity thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022870928.9U CN214333095U (en) | 2020-12-04 | 2020-12-04 | Stirling refrigerator and device for measuring refrigerating capacity thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214333095U true CN214333095U (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022870928.9U Active CN214333095U (en) | 2020-12-04 | 2020-12-04 | Stirling refrigerator and device for measuring refrigerating capacity thereof |
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| CN (1) | CN214333095U (en) |
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- 2020-12-04 CN CN202022870928.9U patent/CN214333095U/en active Active
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