CN111122017A - Refrigerating capacity measuring device of refrigerating machine - Google Patents
Refrigerating capacity measuring device of refrigerating machine Download PDFInfo
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- CN111122017A CN111122017A CN201911363850.7A CN201911363850A CN111122017A CN 111122017 A CN111122017 A CN 111122017A CN 201911363850 A CN201911363850 A CN 201911363850A CN 111122017 A CN111122017 A CN 111122017A
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- resistor
- power
- refrigerating
- mounting seat
- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
- G01K17/06—Measuring quantity of heat conveyed by flowing media, e.g. in heating systems e.g. the quantity of heat in a transporting medium, delivered to or consumed in an expenditure device
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a refrigerating capacity measuring device of a refrigerating machine, which measures the refrigerating capacity of the refrigerating machine by adopting the thermal balance of a power resistor, has the advantages of simple structure, low cost, convenient operation and high reliability, can be used for the refrigerating capacity test of refrigerating machines with different temperature grades and different models, improves the test efficiency, can realize various environmental tests, has low requirements on space and the level of operators, improves the test efficiency and reduces the personnel cost.
Description
Technical Field
The invention belongs to the technical field of measurement, and particularly relates to a device for measuring refrigerating capacity of a refrigerating machine.
Background
In the prior art, the devices for testing the refrigerating capacity mainly comprise the following two types: one is that the vacuum chamber, temperature measuring device and refrigerating capacity load are coupled with the refrigerator separately, the vacuum chamber, temperature measuring device and load are independent parts, do not interfere with each other; the other is a dewar matched with a refrigerator installation detector manufacturer, and the detector matched dewar is developed by the detector manufacturer and is coupled with a load, a diode and other precise components.
The first method has the disadvantages that the vacuum chamber, the temperature measuring device and the refrigerating capacity load are independent during testing, the vacuum chamber is large in size and mass, large in heat leakage amount, complex in coupling with a refrigerating machine, more in lines, large in fluctuation of the measured refrigerating capacity and long in time consumption. The second method has the disadvantages that the detector matching dewar has a large number of components, part of precise components are easy to damage, the price is high, and most detector manufacturers do not sell matching dewars separately.
Disclosure of Invention
In view of this, the invention provides a device for measuring refrigerating capacity of a refrigerating machine, which can realize reliable measurement of refrigerating capacity of the refrigerating machine and has low measurement cost.
The invention provides a measuring device for refrigerating capacity of a refrigerating machine, which is characterized by comprising a thermometer 1, an electrical parameter tester 2, a direct current power supply 3, a vacuum chamber 4, a platinum resistor 5, a power resistor 6, a resistor mounting seat 7 and a switch 9, wherein the thermometer is arranged on the direct current power supply 3;
the platinum resistor 5 and the power resistor 6 are fixedly attached to the surface of a resistor mounting seat 7, the resistor mounting seat 7 is made of heat conducting materials, and the resistor mounting seat 7 is thermally coupled with a refrigerating end of a refrigerator to be tested; the resistor mounting seat 7, the platinum resistor 5 and the power resistor 6 are sealed in the vacuum chamber 4; the direct current power supply 3 supplies power to the power resistor 6 through the control of the switch 9; the electrical parameter tester 2 is connected with the power resistor 6 to measure the voltage and the current of the power resistor 6, and the power of the power resistor 6 is obtained through calculation according to the voltage and the current;
the power resistor 6 is used for providing heat equal to refrigerating capacity generated by a refrigerator to be measured, the platinum resistor 5 is used for measuring the temperature of the resistor mounting seat 7, and the thermometer 1 is connected with the platinum resistor 5 to read the temperature of the resistor mounting seat 7; when the temperature of the resistor mounting seat 7 is kept in a stable state for a set time, the power of the power resistor 6 is the refrigerating capacity of the refrigerator at the current temperature.
Further, the device also comprises a vacuum gauge 8, a stop valve 10 and a vacuum pump 11, wherein the vacuum pump 11 is sequentially connected with the stop valve 10, the vacuum gauge 8 and the vacuum chamber 4 in a sealing manner.
Has the advantages that:
the refrigerating capacity measuring device has the advantages that the refrigerating capacity of the refrigerating machine is measured through the thermal balance of the power resistor, the refrigerating capacity measuring device is simple in structure, low in cost, convenient to operate and high in reliability, the refrigerating capacity measuring device can be used for testing the refrigerating capacities of refrigerating machines of different temperature grades and different models, the testing efficiency is improved, various environment tests can be achieved, the requirements on space and the level of operators are low, the testing efficiency is improved, and the cost of personnel is reduced.
Drawings
Fig. 1 is a schematic diagram of the structural design principle of a device for measuring the refrigerating capacity of a refrigerator provided by the invention.
Wherein, 1-thermometer, 2-electrical parameter tester, 3-DC power supply, 4-vacuum chamber, 5-platinum resistor, 6-power resistor, 7-resistor mounting seat, 8-vacuum gauge, 9-switch, 10-stop valve, 11-vacuum pump
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a device for measuring refrigerating capacity of a refrigerating machine, which comprises a thermometer 1, an electrical parameter tester 2, a direct current power supply 3, a vacuum chamber 4, a platinum resistor 5, a power resistor 6, a resistor mounting seat 7, a vacuum gauge 8, a switch 9, a stop valve 10 and a vacuum pump 11, as shown in figure 1.
The thermometer 1 is mainly used for displaying the temperature of the cold end of the refrigerator measured by the platinum resistor 5. The electrical parameter tester 2 is mainly used for testing the voltage and the current of the power resistor 6 when the refrigerator works, and calculating the power of the power resistor 6 according to the voltage and the current. The dc power supply 3 is mainly used to supply power to the power resistor 6. The vacuum chamber 4 is mainly used for providing a vacuum environment for the platinum resistor 5 and the power resistor 6. Resistance mount pad 7 mainly used installation platinum resistance 5, power resistance 6 to with the refrigerator cold junction thermal coupling, power resistance 6 is used for providing the heat that the refrigerating output that produces with the refrigerator that awaits measuring equals, platinum resistance 5 is used for measuring the temperature of resistance mount pad 7, thermometer 1 reads the temperature of measuring resistance mount pad 7, during the measurement, when the temperature of resistance mount pad 7 keeps steady state and reaches the settlement time, power resistance 6's power is the refrigerating output of refrigerator at current temperature promptly. The vacuum gauge 8 is mainly used for detecting the pressure of the vacuum chamber 4. The switch 9 is mainly used for controlling the input and output of the dc power supply 3 and the power resistor 6. And a stop valve 10, which is mainly used for connecting or disconnecting the vacuum chamber 4 and the vacuum pump 11 according to the test requirement. The vacuum pump 11 is mainly used for pumping air in the vacuum chamber to reach high vacuum degree and isolating a convection heat transfer path between the cold end of the refrigerator and an air environment.
The measuring process of the device for measuring the refrigerating capacity of the refrigerating machine provided by the invention is as follows:
step 1, turning on a vacuum pump 11 and preheating. The stop valve 10 is opened, the vacuum chamber 4 is evacuated by the vacuum pump 11, and the pressure in the vacuum chamber 4 is detected by the vacuum gauge 8.
And 2, after the vacuum degree is displayed to reach 0.01Pa by the vacuum gauge 8 and is stabilized for 10min, closing the stop valve 10, closing the vacuum pump 11 and disconnecting the vacuum pump 11 from the vacuum chamber 4.
and 4, turning on the electrical parameter measuring instrument 2, the direct current power supply 3 and the switch 9, measuring parameters such as voltage, current and power of the input power resistor 6 by the electrical parameter measuring instrument 2, and displaying the voltage, the current and the power as zero when the direct current power supply does not output.
and 6, testing the refrigerating capacity when the cold end temperature is 200K, starting the direct current power supply 3 when the reading of the thermometer 1 is reduced to 200K, gradually adjusting the power, stabilizing the thermometer 1 at 200K, considering that the cold end temperature of the refrigerating machine is balanced when the deviation is within 0.5K within 10min, and recording the voltage, the current and the power displayed by the electrical parameter measuring instrument 2, wherein the power is the refrigerating capacity of the refrigerating machine at 200K.
And 7, testing the refrigerating capacity when the temperature of the cold end is 100K, starting the direct current power supply 3 when the reading of the thermometer 1 is reduced to 100K, gradually adjusting the power, keeping the thermometer 1 stable at 100K, considering that the temperature of the cold end of the refrigerating machine is balanced when the deviation is within 0.5K within 10min, recording the voltage, the current and the power displayed by the electrical parameter measuring instrument 2, and determining the power as the refrigerating capacity when the refrigerating machine is 100K.
And 8, testing the refrigerating capacity at other temperatures such as 60K, 80K and the like according to needs, wherein the operation method is the same as that in the steps 6 and 7.
And 9, completing the refrigerating capacity test, turning off the refrigerating machine, simultaneously turning off the switch 9, turning off the electric parameter measuring instrument 2 and the direct current power supply 3, monitoring the temperature of the cold end of the refrigerating machine by the thermometer 1, turning off the thermometer 1 when the temperature gradually returns to the normal temperature, decoupling the refrigerating machine from the vacuum chamber 4, and arranging the devices such as the thermometer 1, the electric parameter measuring instrument 2 and the direct current power supply 3 for the next use.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The device for measuring the refrigerating capacity of the refrigerating machine is characterized by comprising a thermometer (1), an electrical parameter tester (2), a direct-current power supply (3), a vacuum chamber (4), a platinum resistor (5), a power resistor (6), a resistor mounting seat (7) and a switch (9);
the platinum resistor (5) and the power resistor (6) are fixedly attached to the surface of the resistor mounting seat (7), the resistor mounting seat (7) is made of a heat conduction material, and the resistor mounting seat (7) is thermally coupled with a refrigerating end of a refrigerator to be tested; the resistor mounting seat (7), the platinum resistor (5) and the power resistor (6) are sealed in the vacuum chamber (4); the direct current power supply (3) supplies power to the power resistor (6) through the control of the switch (9); the electrical parameter tester (2) is connected with the power resistor (6) to measure the voltage and the current of the power resistor (6), and the power of the power resistor (6) is calculated according to the voltage and the current;
the power resistor (6) is used for providing heat equal to the refrigerating capacity generated by the refrigerating machine to be measured, the platinum resistor (5) is used for measuring the temperature of the resistor mounting seat (7), and the thermometer (1) is connected with the platinum resistor (5) to read the temperature of the resistor mounting seat (7); when the temperature of the resistor mounting seat (7) is kept in a stable state for a set time, the power of the power resistor (6) is the refrigerating capacity of the refrigerator at the current temperature.
2. The device according to claim 1, characterized in that it further comprises a vacuum gauge (8), a shut-off valve (10) and a vacuum pump (11), said vacuum pump (11) sealingly connecting the shut-off valve (10), the vacuum gauge (8) and the vacuum chamber (4) in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363850.7A CN111122017A (en) | 2019-12-26 | 2019-12-26 | Refrigerating capacity measuring device of refrigerating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911363850.7A CN111122017A (en) | 2019-12-26 | 2019-12-26 | Refrigerating capacity measuring device of refrigerating machine |
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| Publication Number | Publication Date |
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| CN111122017A true CN111122017A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911363850.7A Pending CN111122017A (en) | 2019-12-26 | 2019-12-26 | Refrigerating capacity measuring device of refrigerating machine |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075043A (en) * | 2001-08-29 | 2003-03-12 | Taisei Kk | Refrigeration capacity testing method and apparatus |
| CN1419107A (en) * | 2002-12-06 | 2003-05-21 | 梁嘉麟 | Refrigeration quantity melering device for cooling food in refrigerator and use method thereof |
| CN203249710U (en) * | 2013-04-26 | 2013-10-23 | 中国科学院上海技术物理研究所 | Multistage thermoelectric cooler parameter vacuum testing device |
| CN204461649U (en) * | 2015-02-27 | 2015-07-08 | 武汉轻工大学 | The calorimeter of adjustable evaporating temperature |
| CN109632150A (en) * | 2018-12-26 | 2019-04-16 | 合肥中科离子医学技术装备有限公司 | A kind of device for GM refrigeration machine cooling power measurement |
-
2019
- 2019-12-26 CN CN201911363850.7A patent/CN111122017A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003075043A (en) * | 2001-08-29 | 2003-03-12 | Taisei Kk | Refrigeration capacity testing method and apparatus |
| CN1419107A (en) * | 2002-12-06 | 2003-05-21 | 梁嘉麟 | Refrigeration quantity melering device for cooling food in refrigerator and use method thereof |
| CN203249710U (en) * | 2013-04-26 | 2013-10-23 | 中国科学院上海技术物理研究所 | Multistage thermoelectric cooler parameter vacuum testing device |
| CN204461649U (en) * | 2015-02-27 | 2015-07-08 | 武汉轻工大学 | The calorimeter of adjustable evaporating temperature |
| CN109632150A (en) * | 2018-12-26 | 2019-04-16 | 合肥中科离子医学技术装备有限公司 | A kind of device for GM refrigeration machine cooling power measurement |
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Application publication date: 20200508 |