CN116222043A - Control method of refrigerating device - Google Patents
Control method of refrigerating device Download PDFInfo
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- CN116222043A CN116222043A CN202111467833.5A CN202111467833A CN116222043A CN 116222043 A CN116222043 A CN 116222043A CN 202111467833 A CN202111467833 A CN 202111467833A CN 116222043 A CN116222043 A CN 116222043A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- OIGNJSKKLXVSLS-VWUMJDOOSA-N prednisolone Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 OIGNJSKKLXVSLS-VWUMJDOOSA-N 0.000 claims abstract description 14
- 238000005057 refrigeration Methods 0.000 claims description 60
- 238000001816 cooling Methods 0.000 claims 3
- 239000003507 refrigerant Substances 0.000 description 43
- 230000001276 controlling effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 235000013611 frozen food Nutrition 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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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
-
- 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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/06—Superheaters
-
- 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
- F25B41/37—Capillary tubes
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
-
- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a control method of a refrigerating device, the refrigerating system also comprises a heat exchanger, the heat exchanger comprises a high-temperature heat exchange tube and a low-temperature heat exchange tube which are arranged in parallel and exchange heat with each other, an inlet of the high-temperature heat exchange tube is connected with a condenser, an outlet of the high-temperature heat exchange tube is connected with a capillary tube, an inlet of the low-temperature heat exchange tube is connected with an evaporator, and an outlet of the low-temperature heat exchange tube is connected with a return air port of a variable frequency compressor; the control method comprises the following steps: when the power is on, the condensing fan is controlled to start, the variable frequency compressor is controlled to start at the frequency F1, and the exhaust temperature Tp at the exhaust port of the variable frequency compressor is monitored in real time; judging whether Tp reaches a set threshold Tp0 within a preset time t 0; if not, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube is reduced to a preset temperature Tg0; if not, the frequency of the variable frequency compressor is controlled to be increased by delta F. The invention can stabilize the operation pressure of the refrigerating system when being electrified, avoid the severe change of the exhaust temperature caused by realizing low-temperature storage and avoid influencing the service life of the variable-frequency compressor.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a control method of a refrigeration device.
Background
With the continuous improvement of the living standard of people, the requirements on the fresh-keeping and storage of foods are also increasing, so that not only the fresh-keeping of refrigerated foods such as vegetables, fruits and the like is concerned, but also the fresh-keeping of frozen foods such as fish, meat and the like is concerned. Through researches, the low-temperature environment of minus 90 ℃ to minus 40 ℃ plays a vital role in the preservation of frozen foods, and in order to ensure that the frozen foods have better preservation and storage effects, the development of a refrigerating device with the storage environment of minus 90 ℃ to minus 40 ℃ is a problem to be solved urgently.
However, due to the low refrigeration temperature, when the power is on, the exhaust temperature of the compressor in the refrigeration system can change drastically, so that the operation pressure of the compressor is high, and the service life of the compressor is further influenced.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a control method of a refrigeration device, so as to solve the technical problems that when the existing refrigeration device is powered on, the exhaust temperature of a compressor can be changed drastically, so that the operation pressure of the compressor is high, and the service life of the compressor is further influenced.
In order to achieve one of the above objects, an embodiment of the present invention provides a control method of a refrigeration apparatus, the refrigeration apparatus including a refrigeration system including a variable frequency compressor, a condenser, a capillary tube, and an evaporator sequentially connected, the refrigeration system further including a heat exchanger including a high-temperature heat exchange tube and a low-temperature heat exchange tube disposed in parallel and exchanging heat with each other, an inlet of the high-temperature heat exchange tube being connected to the condenser and an outlet thereof being connected to the capillary tube, an inlet of the low-temperature heat exchange tube being connected to the evaporator and an outlet thereof being connected to a return air port of the variable frequency compressor, the refrigeration apparatus further including a condensing fan disposed near the condenser;
the control method comprises the following steps: when power is on, the condensing fan is controlled to start, the variable frequency compressor is controlled to start at the frequency F1, and the exhaust temperature Tp at the exhaust port of the variable frequency compressor is monitored in real time; judging whether Tp reaches a set threshold Tp0 within a preset time t 0; if not, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube is reduced to a preset temperature Tg0; if not, controlling the frequency of the variable frequency compressor to increase by delta F.
As a further improvement of an embodiment of the present invention, the control method further includes step s1: after the frequency of the inverter compressor 1 is increased by DeltaF, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube 51 is reduced to a preset temperature Tg0 or not again; if not, controlling the frequency of the variable frequency compressor 1 to increase by delta F; step s1 is repeated until Tg has fallen to Tg0.
As a further improvement of an embodiment of the present invention, the control method further includes: in a preset time t0, if Tp reaches a set threshold Tp0, controlling the variable frequency compressor to stop; and after a preset time t1, controlling the variable frequency compressor to restart.
As a further improvement of an embodiment of the present invention, the refrigeration apparatus has a storage compartment, the refrigeration system supplies cold to the storage compartment, and the control method further includes: when the set temperature Tset of the storage compartment is increased by delta T1, judging whether Tg reaches Tg0 < + > delta T2; if yes, controlling the frequency of the variable frequency compressor to be increased by delta F; wherein Δt1=2 ℃ and Δt2=5 ℃.
As a further improvement of an embodiment of the present invention, the refrigeration apparatus has a storage compartment, the refrigeration system supplies cold to the storage compartment, and the control method further includes: when the set temperature Tset of the storage compartment is reduced by delta T1, judging whether Tg is reduced to Tg 0-delta T2; if yes, controlling the frequency of the variable frequency compressor to be reduced by delta F; wherein Δt1=2 ℃ and Δt2=5 ℃.
As a further improvement of an embodiment of the present invention, the refrigeration apparatus has a storage compartment, the refrigeration system supplies cold to the storage compartment, and the control method further includes: when the temperature Tr of the storage compartment reaches Tr0, controlling the frequency of the variable frequency compressor to be increased by delta F, wherein Tr0=Tset+10 ℃, and Tset is the set temperature of the storage compartment; after a preset time t2, judging whether Tg reaches Tg0; if yes, controlling the frequency of the variable frequency compressor to continue to increase by delta F.
As a further improvement of an embodiment of the present invention, the control method further includes: after a preset time t3, judging whether the temperature in the storage compartment is reduced to Tr1, wherein Tr1 = Tr0-1; if not, alarming.
As a further improvement of one embodiment of the present invention, f1=fmin to fmin+10, and Fmin is a set minimum frequency of the inverter compressor.
As a further improvement of an embodiment of the present invention, t0=3 to 5h, tp0=120 ℃, tg 0= -90 to-40 ℃.
As a further improvement of one embodiment of the present invention, Δf=5 to 10Hz.
Compared with the prior art, the invention has the following beneficial effects: according to the control method of the refrigerating device, when the power is on, the exhaust temperature of the variable frequency compressor is monitored, the situation that the exhaust temperature exceeds the set threshold Tp0 to cause the operation pressure of the refrigerating system to exceed the bearing range of the variable frequency compressor is avoided, and under the condition that the reliable and stable operation of the refrigerating system is ensured, the low-temperature heat exchange tube is enabled to act quickly by adjusting the frequency of the variable frequency compressor, so that the temperature Tg of the outlet of the high-temperature heat exchange tube is reduced to the preset temperature Tg0 as soon as possible, the operation pressure of the refrigerating system is further stabilized, the pressure ratio at two sides of the variable frequency compressor is reduced, the severe change of the exhaust temperature caused by low-temperature storage is avoided, and the service life of the variable frequency compressor is prevented from being influenced.
Drawings
FIG. 1 is a schematic diagram of a refrigeration circuit according to an embodiment of the present invention;
fig. 2 is a logic flow diagram of a control method of a refrigeration apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings.
In the various illustrations of the invention, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for convenience of illustration, and thus serve only to illustrate the basic structure of the inventive subject matter.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements or structures, these described elements should not be limited by these terms. These terms are only used to distinguish one such descriptive object from another.
The refrigeration device provided by the embodiment of the invention comprises a box body and a door body, wherein the box body is internally provided with a storage compartment, the door body is used for opening or closing the storage compartment, and the refrigeration device further comprises a refrigeration system which is arranged in the box body and supplies cold to the storage compartment. Specifically, the refrigerating device can be set as a refrigerator, a freezer and the like so as to meet the requirements of different users and different application scenes.
Referring to fig. 1, the refrigeration system includes a refrigeration circuit 100 and a refrigerant in the refrigeration circuit 100, the refrigeration circuit 100 includes a variable frequency compressor 1, a condenser 2, a capillary tube 3, and an evaporator 4 sequentially connected, the refrigeration circuit 100 further includes a heat exchanger 5, the heat exchanger 5 includes a high temperature heat exchange tube 51 and a low temperature heat exchange tube 52 which are disposed in parallel and exchange heat with each other, an inlet of the high temperature heat exchange tube 51 is connected with the condenser 2 and an outlet thereof is connected with the capillary tube 3, an inlet of the low temperature heat exchange tube 52 is connected with an outlet of the evaporator 4 and an outlet thereof is connected with an air return port of the variable frequency compressor 1. The high temperature heat exchange tube 51 and the low temperature heat exchange tube 52 are named herein for convenience of distinction, and in comparison, the temperature of the refrigerant in the high temperature heat exchange tube 51 is higher than the temperature of the refrigerant in the low temperature heat exchange tube 52.
The refrigerating system is simple in structure and easy to realize in processing technology, and through heat exchange of the high-temperature heat exchange tube 51 and the low-temperature heat exchange tube 52, on one hand, the refrigerant is subjected to primary heat exchange and temperature reduction before entering the variable frequency compressor 1 after leaving the evaporator 4, on the other hand, the refrigerant is subjected to heat exchange and temperature rise before entering the variable frequency compressor 1, and the heat exchange of the refrigerating system is reasonably utilized, so that the pressure between the outlet of the variable frequency compressor 1 and the inlet of the capillary tube 3 is controlled in a range which can be born by the variable frequency compressor 1 during stable operation of the refrigerating system, low-temperature refrigeration below-40 ℃ is facilitated, energy consumption can be greatly reduced, and great environmental protection significance is achieved.
Specifically, the high-temperature heat exchange tube 51 and the low-temperature heat exchange tube 52 may be disposed in a side-by-side manner or may be disposed in a winding manner, so as to exchange heat.
Further, the refrigerating device further comprises a condensing fan arranged close to the condenser 2, and the condensing fan can supply air to the condenser 2 so as to enable the condenser 2 to dissipate heat.
Further, the refrigeration circuit 100 further includes a drier-filter 6 provided at an outlet of the condenser 2 to remove moisture and impurities mixed in the refrigerant, and an outlet of the drier-filter 6 is connected to the high temperature heat exchange tube 51.
Preferably, in this embodiment, the refrigerant includes a first working medium and a second working medium, the mass percentage of the first working medium is 10-60%, the mass percentage of the second working medium is 40-90%, the first working medium is one of R170, R1150, R23 or R14, and the second working medium is any one of R290, R600a, R134a, R1234fy or R1234 ze.
When the refrigerant formed by mixing the two working mediums is applied to the refrigerating system of the embodiment by regulating and controlling the proportion of the two working mediums, the temperature in the storage compartment of the refrigerating device can reach-90 ℃ to-40 ℃ under the condition of meeting the requirement of the refrigerating system on the filling amount of the combustible refrigerant, and a better fresh-keeping effect is achieved on frozen foods stored in the storage compartment. In practical application, the mass percentages of the two working media can be regulated and controlled according to the volume, the ambient temperature, the application scene and the like of the refrigerating device, so that an ideal fresh-keeping effect is achieved.
Preferably, the first working medium is R170 or R1150, the second working medium is any one of R290, R600 and R600a, the mass percentage of the first working medium is 20-50%, and the mass percentage of the second working medium is 50-80%. The binary mixed refrigerant prepared in this way not only can meet the temperature requirement of minus 90 ℃ to minus 40 ℃, but also is environment-friendly and has important environmental protection significance.
Preferably, the first working medium is R23 or R14, the second working medium is any one of R290, R600 and R600a, the mass percentage of the first working medium is 10-40%, and the mass percentage of the second working medium is 60-90%. The binary mixed refrigerant prepared in this way not only can meet the temperature requirement of minus 90 ℃ to minus 40 ℃, but also has flame retardant effect, and improves the operation safety of the refrigeration system.
Preferably, the first working medium is R170 or R1150, the second working medium is any one of R134a, R1234fy and R1234ze, the mass percentage of the first working medium is 10-40%, and the mass percentage of the second working medium is 60-90%. The binary mixed refrigerant prepared in this way not only can meet the temperature requirement of minus 90 ℃ to minus 40 ℃, but also has flame retardant effect, and improves the operation safety of the refrigeration system.
Preferably, the first working medium is R23 or R14, the second working medium is any one of R134a, R1234fy and R1234ze, the mass percentage of the first working medium is 20-50%, and the mass percentage of the second working medium is 50-80%. The binary mixed refrigerant prepared in this way not only can meet the temperature requirement of minus 90 ℃ to minus 40 ℃, but also has flame retardant effect, and improves the operation safety of the refrigeration system.
In other embodiments, the refrigerant may also be configured to: the high-temperature heat exchanger comprises a low-temperature refrigerant, a medium-temperature refrigerant and a high-temperature refrigerant, wherein the mass percentage of the low-temperature refrigerant is 20-40%, the mass percentage of the medium-temperature refrigerant is 20-40%, the mass percentage of the high-temperature refrigerant is 40-60%, the low-temperature refrigerant is any one of R23, R14, R170 and R1150, the medium-temperature refrigerant is any one of R134a, R290 and R1270, and the high-temperature refrigerant is any one of R600 and R600 a.
When the refrigerant mixed by the three working mediums is applied to the refrigerating system of the embodiment by regulating and controlling the proportion of the three working mediums, the refrigerant not only has lower evaporation temperature and lower evaporation pressure under the condition of meeting the requirement of the refrigerating system on the filling quantity of the combustible refrigerant, but also can reduce the compression ratio of the compressor, reduce throttling loss and heat transfer loss, improve the refrigerating efficiency and improve the refrigerating effect, ensure that the temperature in a storage room of the refrigerating device reaches-90 to-40 ℃, be beneficial to preserving frozen foods such as meat, fish and the like, and can reduce the technical requirement on the compressor when the refrigerant is applied to the refrigerating system. In practical application, the mass percentages of the three working media can be regulated and controlled according to the volume, the ambient temperature, the application scene and the like of the refrigerating device, so that the ideal fresh-keeping effect is achieved.
In this way, the refrigerant is compressed into high-temperature and high-pressure refrigerant gas through the variable frequency compressor 1, and the refrigerant gas enters the condenser 2 to be condensed into gas-liquid two-phase refrigerant; the refrigerant with gas-liquid two phases enters the heat exchanger 5, exchanges heat with the low-temperature heat exchange tube 52 in the high-temperature heat exchange tube 51 and is further condensed; then the refrigerant enters the capillary tube 3 for throttling and depressurization; then the refrigerant enters the evaporator 4 to exchange heat to form a gas-liquid two-phase refrigerant, namely the refrigerant is in gas-liquid two-phase at the outlet of the evaporator 4; the gas-liquid two-phase refrigerant passes through the low-temperature heat exchange tube 52 and exchanges heat with the high-temperature heat exchange tube 51 to cool and condense the refrigerant in the high-temperature heat exchange tube 51, and the refrigerant is in a gaseous state at the outlet of the low-temperature heat exchange tube 52; the refrigerant is then returned to the inverter compressor 1.
By applying the above refrigerant to the refrigeration system of the present invention, the pressure of the pipeline of the refrigeration circuit 100 between the inverter compressor 1 and the capillary 41 after stable operation can be controlled to be less than 1.6Mpa, which solves the problem of excessively high pressure when the low-temperature refrigerant is applied to the refrigeration system alone, reduces the requirement on the compressor, ensures the feasibility of the refrigeration system, and thus makes the refrigeration device realize a low-temperature storage environment of-90 ℃ to-40 ℃.
Further, the temperature Tl of the refrigerant at the outlet of the condenser 2 is greater than the ambient temperature Th, and the temperature difference Δt=tl-Th between the two is less than or equal to 3 ℃, and Δt in this embodiment is below 3 ℃ and is far less than 8 ℃ in the prior art.
The embodiment of the invention also provides a control method of the refrigerating device, which is realized based on the refrigerating device.
Referring to fig. 2, specifically, the control method includes:
when power is on, the condensing fan is controlled to start, the variable frequency compressor 1 is controlled to start at the frequency F1, and the exhaust temperature Tp at the exhaust port of the variable frequency compressor 1 is monitored in real time;
judging whether Tp reaches a set threshold Tp0 within a preset time t 0;
if not, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube 51 is reduced to a preset temperature Tg0;
if not, the frequency of the inverter compressor 1 is controlled to be increased by Δf.
By monitoring the exhaust temperature of the variable frequency compressor 1 during power-on, the exhaust temperature is prevented from exceeding the set threshold Tp0 to cause the operation pressure of the refrigerating system to exceed the bearing range, and under the condition of ensuring the reliable and stable operation of the refrigerating system, the low-temperature heat exchange tube 52 is enabled to rapidly act by adjusting the frequency of the variable frequency compressor 1, so that the temperature Tg of the outlet of the high-temperature heat exchange tube 51 is reduced to the preset temperature Tg0 as soon as possible, the operation pressure of the refrigerating system is further stabilized, the pressure ratio of the two sides of the variable frequency compressor 1 is reduced, the severe change of the exhaust temperature caused by low-temperature storage is avoided, and the service life of the variable frequency compressor is prevented from being influenced.
Preferably, f1=fmin to fmin+10, where Fmin is the set minimum frequency of the inverter compressor 1. The variable frequency compressor 1 is started at a lower frequency F1, so that the pressure born by the variable frequency compressor 1 during power-on can be further reduced, and the frequency raising of the follow-up variable frequency compressor 1 is facilitated.
Preferably, t0=3 to 5h, tp0=120 ℃, so that the stage in which the drastic change of the discharge temperature is most likely to occur at the time of power-up can be controlled so as to avoid that the operation pressure of the refrigeration system exceeds the range that the inverter compressor 1 can withstand.
Preferably, tg 0= -90 to-40 ℃, where the specific value of Tg0 is the lowest evaporation temperature of the refrigeration device, and the lowest evaporation temperature of the refrigeration system is determined at design time, and the lowest evaporation temperatures of different refrigeration devices are different. The temperature Tg of the outlet of the high-temperature heat exchange tube 51 in the initial stage after power-up is controlled to reach the minimum evaporation temperature of the refrigerating device as soon as possible, so that the refrigerating system can operate efficiently and reliably and stably.
Preferably, Δf=5 to 10Hz, it is possible to avoid that the frequency of the inverter compressor 1 is changed excessively to cause drastic changes in the discharge pressure, thereby preventing the withstand range of the inverter compressor 1 from being exceeded.
Further, the control method further includes step s1: after the frequency of the inverter compressor 1 is increased by DeltaF, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube 51 is reduced to a preset temperature Tg0 or not again; if not, the frequency of the inverter compressor 1 is controlled to be increased by Δf.
Step s1 is repeated until Tg has fallen to Tg0.
Further, the control method further includes:
in a preset time t0, if Tp reaches a set threshold Tp0, controlling the variable frequency compressor 1 to stop so as to prevent the operation pressure of the refrigeration system from exceeding the bearing range of the variable frequency compressor 1 and damaging the variable frequency compressor;
and after a preset time t1, controlling the variable frequency compressor to restart. By controlling the variable frequency compressor 1 to stop for a period of time, the operation pressure of the refrigerating system tends to be stable, so as to protect the variable frequency compressor 1.
Preferably, t1=30 min. The variable frequency compressor 1 is stopped for 30min, so that the running pressure of a refrigerating system tends to be stable, the risk can be reduced by restarting the variable frequency compressor 1, and the problem that the time required for lowering the set temperature Tset in the storage compartment is too long due to the overlong stopping time of the variable frequency compressor 1 is solved.
Further, the control method further includes:
when the set temperature Tset of the storage compartment is increased by delta T1, judging whether Tg reaches Tg0 < + > delta T2;
if so, the frequency of the inverter compressor 1 is controlled to be increased by Δf.
When the set temperature Tset of the storage compartment is increased by Δt1, the discharge temperature Tg is correspondingly increased, and if the increase of the discharge temperature Tg reaches Δt2, the frequency of the inverter compressor 1 needs to be regulated so as to avoid unstable operation of the refrigeration system due to overhigh discharge temperature and damage to the inverter compressor 1.
When Δt1=2deg.c, Δt2=5deg.c and Δf=5-10 Hz, that is, after every 2 deg.c rise of the set temperature Tset of the storage compartment, it needs to determine whether the rise of the exhaust temperature Tg reaches 5 deg.c, if so, it needs to raise the frequency of the inverter compressor 1 by 5-10 Hz, so as to avoid unstable operation caused by excessive frequency change of the inverter compressor 1.
Likewise, when the set temperature Tset of the storage compartment decreases by Δt1, determining whether Tg decreases to Tg0- Δt2;
if yes, controlling the frequency of the variable frequency compressor to be reduced by delta F.
When the set temperature Tset of the storage compartment is reduced by Δt1, the discharge temperature Tg is correspondingly reduced, and if the reduction of the discharge temperature Tg reaches Δt2, the frequency of the inverter compressor 1 needs to be regulated so as to avoid unstable operation of the refrigeration system due to severe change of the discharge temperature, which causes damage to the inverter compressor 1.
When Δt1=2deg.c, Δt2=5deg.c and Δf=5-10 Hz, that is, after the set temperature Tset of the storage chamber is reduced by 2 deg.c, it is necessary to determine whether the amplitude of the exhaust temperature Tg reaches 5 deg.c, if so, it is necessary to reduce the frequency of the inverter compressor 1 by 5-10 Hz, so as to avoid unstable operation caused by excessive frequency change of the inverter compressor 1.
Further, the control method further includes:
when the temperature Tr of the storage compartment reaches Tr0, controlling the frequency of the variable frequency compressor 1 to increase by Δf, wherein Tr0 = Tset +10 ℃, tset being the set temperature of the storage compartment;
after a preset time t2, judging whether Tg reaches Tg0;
if so, the frequency of the inverter compressor 1 is controlled to continue to increase by Δf.
When a user puts a large amount of heat load into the storage compartment, the temperature Tr of the storage compartment is suddenly increased, if the increase of Tr is too large, the temperature Tr of the storage compartment is higher than the set temperature Tset by 10 ℃, the exhaust temperature of the variable frequency compressor 1 is caused to be severely changed, the temperature Tg of the outlet of the high temperature heat exchange tube 51 can be reduced by regulating and controlling the frequency rising of the variable frequency compressor 1, the monitoring of Tg is further combined, the operation condition of the refrigerating system is fed back, and the control of the variable frequency compressor 1 is further enhanced, so that the temperature of the storage compartment is reduced to the set temperature as soon as possible under the condition that the refrigerating system is operated at the temperature.
Preferably, t2=10 min to regulate the refrigeration system as soon as possible, and to reduce the temperature of the storage compartment to the set temperature as soon as possible.
Further, the control method further includes: after a preset time t3, judging whether the temperature in the storage compartment is reduced to Tr1, wherein Tr1 = Tr0-1;
if not, alarming.
If the temperature of the storage compartment is not reduced by 1 ℃ after a certain time, the refrigerating system is indicated to be faulty, and the user is reminded to detect and maintain through an alarm so as to avoid damage to the refrigerating device caused by continuous operation and influence the service life of the refrigerating device.
Preferably, t3=1h, on one hand, whether the refrigerating device fails or not can be estimated, and damage to the refrigerating device, which is difficult to recover due to overlong operation time of the refrigerating system under the condition of failure, can be avoided.
Compared with the prior art, the control method of the refrigerating device has the beneficial effects that: according to the invention, when the power is on, the exhaust temperature of the variable frequency compressor 1 is monitored, the condition that the exhaust temperature exceeds the set threshold Tp0 to cause the operation pressure of the refrigerating system to exceed the bearing range of the variable frequency compressor is avoided, and under the condition that the reliable and stable operation of the refrigerating system is ensured, the low-temperature heat exchange tube 52 is enabled to act rapidly by adjusting the frequency of the variable frequency compressor 1, so that the temperature Tg of the outlet of the high-temperature heat exchange tube 51 is reduced to the preset temperature Tg0 as soon as possible, the operation pressure of the refrigerating system is further stabilized, the pressure ratio of two sides of the variable frequency compressor 1 is reduced, the severe change of the exhaust temperature caused by low-temperature storage is avoided, and the influence on the service life of the variable frequency compressor is avoided.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The control method of the refrigerating device comprises a refrigerating system, wherein the refrigerating system comprises a variable frequency compressor, a condenser, a capillary tube and an evaporator which are sequentially connected, and is characterized by further comprising a heat exchanger, wherein the heat exchanger comprises a high-temperature heat exchange tube and a low-temperature heat exchange tube which are arranged in parallel and exchange heat mutually, an inlet of the high-temperature heat exchange tube is connected with the condenser, an outlet of the high-temperature heat exchange tube is connected with the capillary tube, an inlet of the low-temperature heat exchange tube is connected with the evaporator, an outlet of the low-temperature heat exchange tube is connected with a return air port of the variable frequency compressor, and the refrigerating device further comprises a condensing fan which is arranged close to the condenser;
the control method comprises the following steps:
when power is on, the condensing fan is controlled to start, the variable frequency compressor is controlled to start at the frequency F1, and the exhaust temperature Tp at the exhaust port of the variable frequency compressor is monitored in real time;
judging whether Tp reaches a set threshold Tp0 within a preset time t 0;
if not, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube is reduced to a preset temperature Tg0;
if not, controlling the frequency of the variable frequency compressor to increase by delta F.
2. The control method of a refrigeration apparatus according to claim 1, characterized in that the control method further comprises step s1: after the frequency of the inverter compressor 1 is increased by DeltaF, judging whether the temperature Tg of the outlet of the high-temperature heat exchange tube 51 is reduced to a preset temperature Tg0 or not again; if not, controlling the frequency of the variable frequency compressor 1 to increase by delta F;
step s1 is repeated until Tg has fallen to Tg0.
3. The control method of a refrigeration apparatus according to claim 1, characterized in that the control method further comprises:
in a preset time t0, if Tp reaches a set threshold Tp0, controlling the variable frequency compressor to stop;
and after a preset time t1, controlling the variable frequency compressor to restart.
4. The control method of a refrigeration unit according to claim 1, wherein the refrigeration unit has a storage compartment, the refrigeration system cooling the storage compartment, the control method further comprising:
when the set temperature Tset of the storage compartment is increased by delta T1, judging whether Tg reaches Tg0 < + > delta T2;
if yes, controlling the frequency of the variable frequency compressor to be increased by delta F;
wherein Δt1=2 ℃ and Δt2=5 ℃.
5. The control method of a refrigeration unit according to claim 1, wherein the refrigeration unit has a storage compartment, the refrigeration system cooling the storage compartment, the control method further comprising:
when the set temperature Tset of the storage compartment is reduced by delta T1, judging whether Tg is reduced to Tg 0-delta T2;
if yes, controlling the frequency of the variable frequency compressor to be reduced by delta F;
wherein Δt1=2 ℃ and Δt2=5 ℃.
6. The control method of a refrigeration unit according to claim 1, wherein the refrigeration unit has a storage compartment, the refrigeration system cooling the storage compartment, the control method further comprising:
when the temperature Tr of the storage compartment reaches Tr0, controlling the frequency of the variable frequency compressor to be increased by delta F, wherein Tr0=Tset+10 ℃, and Tset is the set temperature of the storage compartment;
after a preset time t2, judging whether Tg reaches Tg0;
if yes, controlling the frequency of the variable frequency compressor to continue to increase by delta F.
7. The control method of a refrigeration unit as recited in claim 6, wherein said control method further comprises: after a preset time t3, judging whether the temperature in the storage compartment is reduced to Tr1, wherein Tr1 = Tr0-1;
if not, alarming.
8. The method of controlling a refrigeration apparatus according to any one of claims 1 to 7, wherein f1=fmin to fmin+10, and Fmin is a set minimum frequency of the inverter compressor.
9. The method of controlling a refrigeration apparatus according to any one of claims 1 to 7, wherein t0=3 to 5 hours, tp0=120 ℃, and Tg 0= -90 to-40 ℃.
10. A control method of a refrigeration apparatus according to any one of claims 1 to 7, characterized in that Δf=5 to 10Hz.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111467833.5A CN116222043A (en) | 2021-12-03 | 2021-12-03 | Control method of refrigerating device |
| PCT/CN2022/135773 WO2023098780A1 (en) | 2021-12-03 | 2022-12-01 | Control method of refrigeration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111467833.5A CN116222043A (en) | 2021-12-03 | 2021-12-03 | Control method of refrigerating device |
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| CN116222043A true CN116222043A (en) | 2023-06-06 |
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| CN202111467833.5A Pending CN116222043A (en) | 2021-12-03 | 2021-12-03 | Control method of refrigerating device |
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| CN (1) | CN116222043A (en) |
| WO (1) | WO2023098780A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60125146T2 (en) * | 2001-05-22 | 2007-04-12 | Zexel Valeo Climate Control Corp. | Heat exchanger for air conditioning |
| JP2004061061A (en) * | 2002-07-31 | 2004-02-26 | Matsushita Electric Ind Co Ltd | Freezing cycle device and its operation method |
| JP4241127B2 (en) * | 2003-03-25 | 2009-03-18 | 三洋電機株式会社 | Transcritical refrigerant cycle equipment |
| DE102004034869A1 (en) * | 2003-12-10 | 2005-07-14 | Liebherr-Hausgeräte Ochsenhausen GmbH | Process for the storage of frozen goods |
| CN111706997B (en) * | 2020-03-09 | 2021-04-20 | 西安交通大学 | Transcritical carbon dioxide air heater and performance optimization control method thereof |
| CN111623547B (en) * | 2020-05-13 | 2021-07-20 | 东南大学 | Compressor frequency control method of transcritical carbon dioxide heat pump hot water system |
| CN112212532B (en) * | 2020-09-29 | 2022-04-19 | 浙江博阳压缩机有限公司 | Control method of variable-frequency refrigeration system |
| CN112484330A (en) * | 2020-12-28 | 2021-03-12 | 河南新飞制冷器具有限公司 | Brayton refrigeration cycle low-temperature box |
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- 2021-12-03 CN CN202111467833.5A patent/CN116222043A/en active Pending
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| WO2023098780A1 (en) | 2023-06-08 |
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