CN113776863B - Comprehensive test device and method for remote refrigeration appliance - Google Patents
Comprehensive test device and method for remote refrigeration appliance Download PDFInfo
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- CN113776863B CN113776863B CN202110817479.8A CN202110817479A CN113776863B CN 113776863 B CN113776863 B CN 113776863B CN 202110817479 A CN202110817479 A CN 202110817479A CN 113776863 B CN113776863 B CN 113776863B
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- 238000012360 testing method Methods 0.000 title claims abstract description 72
- 238000005057 refrigeration Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003507 refrigerant Substances 0.000 claims abstract description 60
- 239000007788 liquid Substances 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000001704 evaporation Methods 0.000 abstract description 6
- 230000008020 evaporation Effects 0.000 abstract description 6
- 238000010998 test method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a comprehensive test device and a comprehensive test method for a remote refrigeration device, wherein the comprehensive test device adopts a fixed-frequency compressor, is provided with an adjusting bypass which is connected in parallel with a tested piece in a refrigeration loop and is used for shunting in the test process, and the adjusting bypass consists of an electromagnetic expansion valve and a calorimeter which are connected in series. According to the invention, the adjusting bypass is arranged, when the capacity of the tested piece is smaller and is not matched with the adopted fixed-frequency compressor, the refrigerant exceeding the capacity of the tested piece directly flows away from the adjusting bypass, so that the fixed-frequency compressor always keeps rated power to stably operate, namely, the performance and energy efficiency test of the refrigerating appliance with larger capacity and evaporation temperature difference can be compatible, wherein the test of the refrigerating appliance with small capacity can be stably completed, and the refrigerating capacity span exceeding the variable-frequency compressor is realized.
Description
Technical Field
The invention belongs to the technical field of performance and energy efficiency tests of refrigeration appliances, and particularly relates to a comprehensive test device for a remote refrigeration appliance and a method for testing the performance and energy efficiency of the remote refrigeration appliance by using the comprehensive test device. The refrigerator can be divided into a self-carrying refrigerator and a remote refrigerator according to a cold source system, wherein the remote refrigerator refers to a refrigerator with an external cold source and generally comprises a refrigeration storage cabinet, a refrigeration display cabinet and the like which are applied to places such as business, hotels and kitchens.
Background
The existing remote refrigerator performance and energy efficiency testing process is generally as follows:
1) Controlling the temperature and humidity of air between environments to obtain the environment working condition required by the test of the refrigerating appliance;
2) The test device is used for testing the refrigerating appliance, and data such as refrigerating system parameters, electric parameters, environment temperature and humidity parameters and the like of the refrigerating appliance in the test process are obtained through the sensor, the data acquisition module and the like.
3) And checking the performance and energy consumption of the refrigeration appliance according to the parameters.
When the performance and energy consumption of the remote refrigerator are tested, the test device needs to be provided with an external compressor to drive the cold source. The compressor is required to have a relatively large refrigeration span due to the large difference in volume and evaporation temperature of the different remote refrigerators. The fixed frequency compressors are generally selected in a one-to-one pairing manner according to the capacity of the piece to be tested, such as a refrigerator. The variable frequency compressor can expand the refrigerating capacity span of the compressor. The variable frequency compressor regulates the flow through the rotating speed, and the rotating speed is low. But the minimum operating frequency of the inverter compressor is limited. If the configured compressor has a large capacity and the measured piece has a too small capacity, the compressor frequency range is limited, and a too small capacity may not be realized. If a small compressor is provided, a large capacity freezer may not be tested.
In addition, domestic refrigeration appliances such as refrigerators use a large variety of refrigerants, conventional non-flammable refrigerants such as R404a, R410a, R22 and the like, and along with popularization and use of flammable refrigerants, the flammable refrigerants such as R290 and R600a and the like are gradually applied to commercial refrigerators, which again requires that the compressors cannot be matched singly.
In summary, the existing remote refrigerator testing device has the following disadvantages:
1. the compressors need to be selected in a pairing mode according to the capacity of the tested piece, even if the variable-frequency compressors are used, the refrigerating capacity span range of the compressors is still limited, and the refrigerating appliances with small capacity often cannot finish the test;
2. testing of remotely located refrigerators using different refrigerants, particularly those that are not compatible with use of flammable refrigerants, cannot be met.
Disclosure of Invention
The invention aims to provide a comprehensive test device for remote refrigerating appliances such as a refrigerator and the like, which can be used for testing the performance and energy efficiency of refrigerating appliances with large capacity and evaporation temperature difference, and can stably finish the test of small-capacity refrigerating appliances.
The realization scheme of the aim of the invention is as follows: the utility model provides a comprehensive test device to remote refrigeration utensil, includes gas-liquid separator, compressor, oil separator, condenser, reservoir, subcooler, the compressor is the fixed frequency compressor, and they are in series by the pipeline with the measured piece together, form the refrigeration circuit, in the refrigeration circuit, gas-liquid separator, compressor, oil separator, condenser, reservoir, subcooler, measured piece connect gradually, its characterized in that, comprehensive test device still include with the measured piece parallelly connected, be used for the regulation bypass of in-process reposition of redundant personnel, the regulation bypass comprises electromagnetic expansion valve and calorimeter that the series is connected.
The condenser and the subcooler can adjust the temperature of the inlet of the measured piece. The refrigerant flowing out through the subcooler can be divided into two paths, as shown in fig. 1, one path enters the tested piece, and the other path passes through the regulating bypass, and the regulating bypass can be used for regulating the pressure of the outlet of the tested piece. It can be seen that the above device meets the test requirements for the outlet pressure and inlet temperature of the tested piece in standards GB 26920.1 and GB/T21001.2.
When the capacity of the measured piece is smaller and is not matched with the compressor, the refrigerant exceeding the capacity of the measured piece flows away from the regulating bypass, and the compressor can always keep rated power to stably run. Therefore, the comprehensive test device can be compatible with the performance and energy efficiency test of the refrigerating appliance with larger volume and evaporation temperature difference, and can stably complete the test of the refrigerating appliance with small volume.
The invention is composed of an electromagnetic expansion valve and a calorimeter which are connected in series by the adjusting bypass, wherein the electromagnetic expansion valve is used for adjusting the flow control of the bypass, and the calorimeter is used for heating the input refrigerant to neutralize partial cold energy, thereby ensuring that the gaseous refrigerant has overheat temperature and preventing the compressor from running with liquid.
As an improvement scheme: the comprehensive test device adopts a compressor unit to drive refrigerant in the refrigerating circuit to circularly flow, the compressor unit comprises more than two compressor branches connected in parallel, each compressor branch consists of a gas-liquid separator, a compressor and an oil separator which are connected in series, the two ends of each compressor branch are also respectively connected with a valve in series, and the compressors in each compressor branch are used for driving different refrigerants.
During testing, the corresponding compressor branch is selected to be started and the other compressor branches are selected to be closed according to the type of the refrigerant. In the embodiment, the gas-liquid separator and the oil separator are independently configured for each compressor branch, so that the switching of different compressors is facilitated. The valves at the two ends of the compressor branch are used for controlling the opening and closing of the branch.
In order to meet the test requirements of non-flammable and flammable refrigerant refrigerating appliances at the same time, all parts of the comprehensive experiment device are explosion-proof devices.
The common connecting pipeline of each parallel compressor branch in the compressor unit is provided with a free end, and a valve is arranged on the free end. The valve is used for closing the free end and the reserved free end, so that the compressor unit can conveniently expand more compressor branches.
Another object of the present invention is to provide a method for testing performance and energy efficiency of a remote refrigerator, particularly a small-capacity remote refrigerator, using the integrated test apparatus, comprising the steps of:
and setting the shunt quantity of the regulating bypass in real time according to the flow of the branch circuit where the measured piece is positioned, maintaining the flow, the temperature and the pressure of the outlet of the subcooler unchanged, closing the branch circuit where the measured piece is positioned when the temperature between the measured pieces reaches a set value, enabling the refrigerant to pass through the regulating bypass, and reducing the shunt quantity of the regulating bypass when the temperature between the measured pieces is raised to a set starting temperature, and recovering the supply of the refrigerant of the measured piece.
The above object is also achieved as follows: the method for testing the performance and the energy efficiency of the remote refrigeration appliance, particularly the remote refrigeration appliance with small capacity by utilizing the comprehensive test device is characterized by comprising the following steps:
1) Selecting to start corresponding compressor branches according to the type of the refrigerant of the tested piece, and closing other compressor branches; if the switching of the compressors is involved, firstly, evacuating and vacuumizing the refrigeration loop, then selecting to start the corresponding compressor branch according to the type of the refrigerant of the tested piece, and closing other compressor branches;
2) And setting the shunt quantity of the regulating bypass in real time according to the flow of the branch circuit where the measured piece is positioned, maintaining the flow, the temperature and the pressure of the outlet of the subcooler unchanged, closing the branch circuit where the measured piece is positioned when the temperature between the measured pieces reaches a set value, enabling the refrigerant to pass through the regulating bypass, and reducing the shunt quantity of the regulating bypass when the temperature between the measured pieces is raised to a set starting temperature, and recovering the supply of the refrigerant of the measured piece.
Compared with the prior art, the invention has the following beneficial effects:
1) According to the invention, the adjusting bypass is arranged, when the capacity of the tested piece is smaller and is not matched with the adopted fixed-frequency compressor, the refrigerant exceeding the capacity of the tested piece directly flows away from the adjusting bypass, so that the fixed-frequency compressor always keeps rated power to stably operate, namely, the performance and energy efficiency test of the refrigerating appliance with larger capacity and evaporation temperature difference can be compatible, wherein the test of the refrigerating appliance with small capacity can be stably completed, and the refrigerating capacity span exceeding the variable-frequency compressor is realized.
2) When the temperature of the room between the measured pieces reaches a set value, the branch circuit where the measured pieces are positioned is closed, so that the refrigerant passes through the regulating bypass, and when the temperature of the room between the measured pieces rises to a set starting temperature, the shunt quantity of the regulating bypass is reduced, and the supply of the refrigerant of the measured pieces is recovered. The comprehensive test device can quickly adjust the quantity of the refrigerant flowing into the tested piece by adjusting the shunt quantity of the bypass, does not need to rely on frequent start and stop of the compressor or the speed change of the compressor to be adjusted through a longer pipeline, and can timely recover and provide the refrigerant meeting the requirements of the tested piece.
3) The comprehensive test device can meet the test requirements of the remote refrigerating appliances adopting different refrigerants, and particularly can be used for testing the remote refrigerating appliances compatible with non-flammable and flammable refrigerants.
4) The comprehensive test device can conveniently expand more compressor branches.
5) When the temperature between the detected pieces reaches a set value, the branch where the detected pieces are located is closed (through the electromagnetic expansion valve of the detected pieces or the electromagnetic valve on the branch where the detected pieces are located, and the like), so that the refrigerant flows away through the electromagnetic expansion valve of the regulating bypass, when the temperature between the detected pieces rises to the set starting temperature, the electromagnetic expansion valve of the detected pieces or the electromagnetic valve of the branch where the detected pieces are located is opened, the electromagnetic expansion valve of the bypass is closed, the detected pieces are quickly recovered to supply cold, and the compressor and the cold supply pipeline system are kept stably and constantly in the process of keeping the compressor to avoid the problem of repeated starting and stopping, thereby being beneficial to better guaranteeing the service life of the compressor and being capable of timely recovering and providing the refrigerant meeting the requirements of the detected pieces.
Drawings
FIG. 1 is a system diagram of a comprehensive test apparatus for a remote refrigerator according to a preferred embodiment of the present invention;
FIG. 2 is a diagram of an installation layout for performance and energy efficiency testing of a remote refrigerator using the integrated test apparatus of FIG. 1;
in the figure, a 1-compressor unit, a 2-energy adjustable unit, a 3-tested piece, a 4-PLC data acquisition system, a 5-computer control system, a 6-environment room, a 7-air sampler, an 8-air processing unit, a 9-humidifier, a 10-cooling water system, an 11-gas-liquid separator, a 12-compressor, a 13-oil separator, a 14-condenser, a 15-liquid storage device, a 16-filter, a 17-subcooler, an 18-flowmeter, a 19-calorimeter and 20-34 are valves, wherein a 29-electromagnetic expansion valve, a 30-electromagnetic valve, a 31-bypass valve, a 32-filling valve and a 33-emptying valve are connectors of an expansion compressor.
Detailed Description
Fig. 1 is a system diagram of a comprehensive test apparatus for a remote refrigerator according to an embodiment of the present invention. As shown in fig. 1, the comprehensive test device of the embodiment mainly comprises a compressor unit, a condenser 14, a liquid storage 15, a subcooler 17 and an adjusting bypass, wherein the compressor unit, the condenser 14, the liquid storage 15, the subcooler 17 and the tested piece 3 are connected in series through pipelines to form a refrigeration loop. The regulation bypass is used for shunt, which is connected in parallel with the test piece 3. The regulating bypass consists of an electromagnetic expansion valve 29 and a calorimeter 19 in series.
The compressor unit in this embodiment is composed of 3 parallel compressor branches. Each compressor branch is composed of a gas-liquid separator 11, a compressor 12, and an oil separator 13 connected in series. The compressor 12 is a fixed-frequency compressor. The two ends of each compressor branch are also connected in series with valves, such as valves 20-26 in fig. 1. The compressors in the 3 parallel compressor branches are used to drive different refrigerants, respectively.
In this embodiment, the gas-liquid separator 11 and the oil separator 13 are separately configured for each compressor branch, so as to facilitate the switching of different compressors.
In order to meet the test requirements of non-flammable and flammable refrigerant refrigerating appliances at the same time, all parts of the comprehensive experiment device are explosion-proof devices. At the same time, it is suggested to install a flammable gas monitoring alarm between environments.
In the embodiment, drain valves are reserved at the bottoms of the liquid reservoir 15 and the oil separator 13, so that the cleaning system is convenient. Reference numeral 16 in fig. 1 denotes a filter for filtering the refrigerant in the refrigeration circuit.
In fact, the valve, the filter and the flowmeter in the invention can be configured according to the needs, and the installation position of the valve, the filter and the flowmeter can be selected according to the needs.
The high-pressure refrigerant gas at the outlet of the compressor 12 is condensed into liquid by the condenser 14 and stored in the liquid storage 15, and then is supercooled by the supercooler 17 to reach the supercooling temperature of the workpiece 3. The subcooler 17 is used to further cool the condensed liquid refrigerant to a subcooled state, which allows the refrigerant temperature to be precisely adjusted. The refrigerant passing through the cooler 17 can be divided into two paths, one path enters the tested piece 3 through the flowmeter 18, the other path is throttled by pressure reduction through the calorimeter 19 and the electromagnetic expansion valve 29, and the pressure of the outlet of the tested piece 3 can be adjusted by adjusting the bypass. Finally, the low-pressure gaseous refrigerant at the outlet of the calorimeter 19 and the outlet of the measured piece 3 is mixed and then enters the air suction port of the compressor 12 after passing through the gas-liquid separator 11. The calorimeter 19 can heat the input low-pressure gaseous refrigerant to neutralize part of the cold energy, thereby ensuring that the gaseous refrigerant has an overheat temperature and preventing the compressor 12 from running with liquid. The gas-liquid separator 11 in front of the inlet of the compressor avoids the operation of the suction liquid of the compressor and ensures the operation safety of the compressor.
It can be seen that the energy adjusting unit (described below) of the integrated test apparatus in fig. 1 can adjust the outlet pressure and the inlet temperature of the test piece 3, and completely meet the requirements of the standards GB 26920.1 and GB/T21001.2.
When the compressor is to be switched, it is necessary to first evacuate and evacuate through the reserved evacuation valve 33 to clean the piping.
When the refrigerant is insufficient, the refrigerant replenishment can be performed through the charging valve 32.
When a new refrigerant compressor needs to be expanded, as shown in fig. 1, a new compressor branch need only be connected to the reserved connection port A, B.
The bypass valve 31 is mainly opened during the period of sudden stop or defrosting of the tested piece 3 when the power is cut off, so that the refrigerant can directly flow away from the bypass valve 31 without passing through the tested piece 3, and is in a closed state in the normal testing process.
According to the invention, the adjusting bypass is arranged, when the capacity of the tested piece is smaller and is not matched with the adopted fixed-frequency compressor, the refrigerant exceeding the capacity of the tested piece directly flows away from the adjusting bypass, so that the fixed-frequency compressor always keeps rated power to stably operate, namely, the performance and energy efficiency test of the refrigerating appliance with larger capacity and evaporation temperature difference can be compatible, wherein the test of the refrigerating appliance with small capacity can be stably completed, and the refrigerating capacity span exceeding the variable-frequency compressor is realized.
When the temperature of the room between the measured pieces reaches a set value, the branch circuit where the measured pieces are positioned is closed, so that the refrigerant passes through the regulating bypass, and when the temperature of the room between the measured pieces rises to a set starting temperature, the shunt quantity of the regulating bypass is reduced, and the supply of the refrigerant of the measured pieces is recovered. The comprehensive test device can quickly adjust the quantity of the refrigerant flowing into the tested piece by adjusting the shunt quantity of the bypass, does not need to rely on frequent start and stop of the compressor or the speed change of the compressor to be adjusted through a longer pipeline, and can timely recover and provide the refrigerant meeting the requirements of the tested piece.
Fig. 2 is a diagram of the installation layout of the remote refrigerator performance and energy efficiency test using the above-mentioned comprehensive test apparatus. The wind speed and temperature and humidity in the room 6 are controlled by an air handling unit 8 and a humidifier 9. The compressor unit 1, the energy adjusting unit 2 and the measured piece 3 are connected into a loop, and the computer control system 5 configures the refrigerating capacity of the measured piece 3 through the energy adjusting unit 2. The cooling water system 10 cools the energy conditioning unit 2 and the compressor unit 1. And 7 is an air sampler, the loop is also provided with sensors for acquiring parameters and electrical parameters of the refrigeration system, the sensors at all measuring points are connected with the PLC data acquisition system 4, and after being acquired by the PLC data acquisition system 4, the data of all measuring points are transmitted to the computer control system 5 through the serial server and are processed to generate a test report.
The performance and energy efficiency test process by using the comprehensive test device is as follows:
1) And controlling the temperature and humidity of air between environments to obtain the environment working condition required by the test of the tested piece.
2) And testing the tested piece by using the comprehensive test device, and acquiring data such as refrigerating system parameters, electric parameters, environment temperature and humidity parameters and the like of the tested piece in the test process by using a sensor, a PLC data acquisition system and the like.
The test process comprises the following steps:
1) Selecting to start the corresponding compressor branch according to the type of the refrigerant of the tested piece 3, and closing other compressor branches; if the switching of the compressors is involved, firstly, the refrigerating loop is emptied and vacuumized, then the corresponding compressor branch is selected to be started according to the type of the refrigerant of the tested piece, and other compressor branches are closed.
2) And the shunt quantity of the regulating bypass is regulated in real time according to the flow setting of the branch where the detected piece is positioned, and the flow, the temperature and the pressure of the outlet of the subcooler are kept unchanged.
Before the tested piece 3 is started, the refrigerant flows away from the electromagnetic expansion valve 29, after the tested piece 3 is started, the expansion valve (or the electromagnetic valve 30) with the tested piece 3 is opened, the flow entering the tested piece 3 is determined by the opening of the branch where the tested piece is positioned, and the rest flow flows away from the electromagnetic expansion valve 29.
Some refrigerators have the characteristic of repeated start-stop periodic operation, when the temperature of the compartment of the detected piece 3 reaches a set value, a branch circuit where the detected piece is located is closed (through an electromagnetic expansion valve or an electromagnetic valve 30 carried by the detected piece 3, when the detected piece 3 is provided with the electromagnetic expansion valve, the electromagnetic valve 30 in fig. 1 can be omitted), so that the refrigerant flows away through the electromagnetic expansion valve 29 of the regulating bypass. When the temperature between the measured pieces 3 rises to the set starting temperature, the branch where the measured pieces are located is opened, the bypass electromagnetic expansion valve 29 is closed, and the measured pieces 3 are quickly recovered to be cooled. The compressor and the cooling pipeline system are kept stably in operation all the time during the period, so that the problem that the compressor 12 is repeatedly started and stopped is avoided, the service life of the compressor is guaranteed, and meanwhile, the refrigerant meeting the requirements of the tested piece 3 can be recovered in time.
3) And (5) checking the performance and energy consumption of the tested piece according to the parameters.
Claims (3)
1. The method for testing the performance and the energy efficiency of the remote refrigeration appliance by utilizing the comprehensive test device is characterized by comprising a gas-liquid separator, a compressor, an oil separator, a condenser, a liquid storage device and a supercooler, wherein the compressor is a fixed-frequency compressor which is connected with a tested piece in series by a pipeline to form a refrigeration loop, in the refrigeration loop, the gas-liquid separator, the compressor, the oil separator, the condenser, the liquid storage device, the supercooler and the tested piece are sequentially connected, and the comprehensive test device also comprises an adjusting bypass which is connected with the tested piece in parallel and used for shunting in the test process, and the adjusting bypass consists of an electromagnetic expansion valve and a calorimeter which are connected in series;
the comprehensive test device adopts a compressor unit to drive refrigerant in the refrigeration loop to circularly flow, the compressor unit comprises more than two compressor branches connected in parallel, each compressor branch consists of a gas-liquid separator, a compressor and an oil separator which are connected in series, the two ends of each compressor branch are also respectively connected in series with a valve, and the compressor in each compressor branch is used for driving different refrigerants;
the method comprises the following steps:
1) Selecting to start corresponding compressor branches according to the type of the refrigerant of the tested piece, and closing other compressor branches; if the switching of the compressors is involved, firstly, evacuating and vacuumizing the refrigeration loop, then selecting to start the corresponding compressor branch according to the type of the refrigerant of the tested piece, and closing other compressor branches;
2) And setting the shunt quantity of the regulating bypass in real time according to the flow of the branch circuit where the measured piece is positioned, maintaining the flow, the temperature and the pressure of the outlet of the subcooler unchanged, closing the branch circuit where the measured piece is positioned when the temperature between the measured pieces reaches a set value, enabling the refrigerant to pass through the regulating bypass, and reducing the shunt quantity of the regulating bypass when the temperature between the measured pieces is raised to a set starting temperature, and recovering the supply of the refrigerant of the measured piece.
2. The method of claim 1, wherein the components of the integrated test device are explosion-proof devices.
3. The method of claim 2, wherein the common connection line of each parallel compressor branch in the compressor package has a free end with a valve disposed thereon.
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| CN202110817479.8A CN113776863B (en) | 2021-07-19 | 2021-07-19 | Comprehensive test device and method for remote refrigeration appliance |
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