CN111735224A - Refrigerating system suitable for multiple load working condition - Google Patents
Refrigerating system suitable for multiple load working condition Download PDFInfo
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- CN111735224A CN111735224A CN202010057090.3A CN202010057090A CN111735224A CN 111735224 A CN111735224 A CN 111735224A CN 202010057090 A CN202010057090 A CN 202010057090A CN 111735224 A CN111735224 A CN 111735224A
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- 238000005057 refrigeration Methods 0.000 claims abstract description 119
- 238000007906 compression Methods 0.000 claims abstract description 73
- 230000006835 compression Effects 0.000 claims abstract description 72
- 230000005494 condensation Effects 0.000 claims abstract description 39
- 238000009833 condensation Methods 0.000 claims abstract description 39
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 abstract description 2
- 230000008020 evaporation Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- F25B2500/00—Problems to be solved
- F25B2500/18—Optimization, e.g. high integration of refrigeration components
Abstract
When the traditional cascade refrigeration system is applied to various working conditions, the system structure is complex, the control system is complex, the idle rate of the unit is high, the operation cost is high, and the initial investment is large. The invention relates to a refrigeration system suitable for various load working conditions, in particular to a refrigeration system which can realize single-stage compression refrigeration cycle and cascade refrigeration cycle under various load working conditions. The closed circulation system comprises a first circulation unit, a second circulation unit and a third circulation unit, wherein in the first circulation unit, a gas exhaust end of a first compressor, a first condenser, a first throttle valve and a first circulation channel of a first condensation evaporator are sequentially connected back to a gas suction end of the first compressor to form closed circulation. The refrigeration system suitable for various load working conditions can realize the switching of the refrigeration cycle system according to the required evaporation temperature and the cold quantity, so that the energy consumption of the system is reduced, the operating cost is reduced, and the energy is saved.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration system which can realize single-stage compression refrigeration cycle and cascade refrigeration cycle under various load working conditions.
Background
The single-stage compression refrigeration system is not suitable for a low-temperature refrigeration system with a compression ratio (the ratio of the discharge pressure to the suction pressure) larger than 12 because of the limitation of the compression ratio of the suction and discharge of the compressor. In the prior art, a dual-stage compression refrigeration system is typically employed when the compression ratio is greater than 12. The double-stage compression refrigerating unit can be driven by one motor and can also be realized by matching a plurality of machine heads. However, the two modes are communicated with each other at high pressure and low pressure, and the oil return problem of the compressor is not easy to solve. In the double-stage compression refrigeration cycle, the compression process is divided into two stages, low-pressure working medium steam from an evaporator firstly enters a low-pressure compressor to be compressed to intermediate pressure, enters a high-pressure compressor through an intercooler to be compressed to condensing pressure, and is discharged into a condenser, so that the pressure ratio of each stage is moderate, the power consumption of the compressor can be reduced due to intermediate cooling, the reliability and the economy are improved, but the refrigeration system is complex, the control system is complex, and the system control under the variable load working condition is difficult to realize.
When refrigeration at lower temperature is needed, the cascade refrigeration system is also a good solution. The heat is absorbed by the working medium of the low-temperature-level refrigerating system, transferred to a condensing evaporator which is connected with the low-temperature-level refrigerating system and the high-temperature-level refrigerating system, and then transferred to the environment by the working medium of the high-temperature-level refrigerating system. However, the traditional cascade refrigeration system has complex system and complex control system, and is difficult to realize system control under variable load working conditions.
When the traditional cascade refrigeration system is applied to various working conditions, the system structure is complex, the control system is complex, the idle rate of a unit is high, the operation cost is high, the initial investment is large, and the structure of a heat exchanger is complex.
Disclosure of Invention
The invention aims to provide a refrigeration system which can realize the switching of a refrigeration cycle system according to the required evaporation temperature and the cold quantity and is suitable for various load working conditions so as to reduce the energy consumption of the system, reduce the operating cost and save the energy source aiming at the technical defects in the prior art.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a refrigeration system suitable for multiple load working conditions comprises a first circulation unit, a second circulation unit and a third circulation unit, wherein in the first circulation unit, a gas exhaust end of a first compressor, a first condenser, a first throttle valve and a first circulation channel of a first condensation evaporator are sequentially connected back to a gas suction end of the first compressor to form a closed circulation;
the second circulation unit comprises a second compressor, a second condenser, a second circulation channel of the first condensation evaporator, a second circulation channel of the second condensation evaporator, a first evaporator, a second throttling valve, a first one-way valve, a second one-way valve, a first three-way reversing valve and a second three-way reversing valve; the second compressor inhale the end with the first interface connection of first three-way reversing valve, the exhaust end of second compressor with the first interface connection of second three-way reversing valve, the second interface of second three-way reversing valve with the entry linkage of second condenser, the export of second condenser respectively with the export of first check valve with the first interface connection of second choke valve, the second interface of second choke valve respectively with the first interface of first evaporimeter with the entry linkage of second check valve, the second interface of first evaporimeter with the third interface connection of first three-way reversing valve, the export of second check valve all the way with the entry linkage of first check valve, another way with first condensation evaporimeter second circulation passageway, the first interface connection of second condensation evaporimeter's second circulation passageway, a second interface of a second circulation channel of the second condensation evaporator is respectively connected with a second interface of the first three-way reversing valve and a third interface of the second three-way reversing valve;
in the third circulation unit, the exhaust end of a third compressor, the first circulation channel of the second condensation evaporator, a third throttle valve and the second evaporator are sequentially connected back to the suction end of the third compressor to form a closed circulation;
the first compressor is a low power compressor, the second compressor is a medium power compressor, and the third compressor is a high power compressor.
When the refrigeration system is a single-stage compression refrigeration cycle, in the second cycle unit, a first interface of the first three-way reversing valve is connected with a third interface, and a first interface of the second three-way reversing valve is connected with a second interface; and the exhaust end of the second compressor, the first interface and the second interface of the second three-way reversing valve, the second condenser, the second throttle valve, the first evaporator, the third interface of the first three-way reversing valve and the first interface are sequentially connected back to the air suction end of the second compressor to form a closed single-stage compression refrigeration cycle.
When the refrigerating system is a cascade compression refrigerating system under a low-load working condition, the first circulating unit is a high-temperature stage compression refrigerating cycle, and the second circulating unit is a low-temperature stage compression refrigerating cycle; in the first circulation unit, a discharge end of the first compressor, a first condenser, a first throttle valve and a first circulation channel of the second condensation evaporator are sequentially connected back to a suction end of the first compressor, so that a high-temperature stage compression refrigeration cycle is completed; in the second circulation unit, a first interface of the first three-way reversing valve is connected with a third interface, and a first interface of the second three-way reversing valve is connected with the third interface; the exhaust end of the second compressor, the first interface and the third interface of the second three-way reversing valve, the second circulation channel of the second condensation evaporator, the second circulation channel of the first condensation evaporator, the first one-way valve, the second throttle valve, the first evaporator, the third interface and the first interface of the first three-way reversing valve are sequentially connected back to the suction end of the second compressor, and the low-temperature stage compression refrigeration cycle is completed.
When the refrigerating system is a cascade compression refrigerating system under a high-load working condition, the second circulating unit is a high-temperature stage compression refrigerating cycle, and the third circulating unit is a low-temperature stage compression refrigerating cycle;
in the second circulation unit, a first interface of the first three-way reversing valve is connected with a second interface, and a first interface of the second three-way reversing valve is connected with the second interface;
the exhaust end of the second compressor, the first interface and the second interface of the second three-way reversing valve, the second condenser, the second throttle valve, the second one-way valve, the second circulation channel of the first condensing evaporator, the second circulation channel of the second condensing evaporator, the second interface and the first interface of the first three-way reversing valve are sequentially connected back to the suction end of the second compressor to form a high-temperature stage compression refrigeration cycle;
in the third circulation unit, the exhaust end of the third compressor, the first circulation channel of the second condensation evaporator, the third throttle valve and the second evaporator are sequentially connected back to the suction end of the third compressor, so that a low-temperature stage compression refrigeration cycle is formed.
The first compressor, the second compressor and the third compressor are respectively any one of a scroll compressor, a rotor compressor, a screw compressor and a piston compressor.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the traditional cascade refrigeration system, the invention is a refrigeration system which can realize single-stage compression refrigeration cycle and cascade refrigeration cycle under various load working conditions, can realize single-stage compression refrigeration cycle and various cascade refrigeration cycles, and has flexible system and wide application range.
2. The refrigerating system capable of realizing single-stage compression refrigeration cycle and cascade refrigeration cycle under multi-load working condition, disclosed by the invention, has the advantages that the first circulating unit and the third circulating unit are fixed units, and only the second circulating unit is a variable unit.
3. The refrigerating system capable of realizing single-stage compression refrigeration cycle and cascade refrigeration cycle under multi-load working condition has the advantages that the condensing evaporator is a common plate heat exchanger and the like, the structure is simple, the operation is convenient, and the heat exchange performance is improved.
4. The refrigerating system capable of realizing single-stage compression refrigeration cycle and cascade refrigeration cycle under multi-load working conditions has the advantages of simple system, capability of selecting an efficient circulation mode under different working conditions, improved system efficiency, reduced system energy consumption and saved system cost.
Drawings
FIG. 1 is a schematic diagram of a refrigeration system of the present invention adapted for use with a variety of load conditions;
FIG. 2 is a schematic interface diagram of a first three-way reversing valve;
FIG. 3 is a schematic interface diagram of a second three-way reversing valve;
FIG. 4 is a schematic view of a first condensing evaporator;
fig. 5 is a schematic view showing the structure of the second condensing evaporator.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The schematic diagram of the refrigeration system of the present invention suitable for various load conditions is shown in fig. 1, and includes a first cycle unit, a second cycle unit, and a third cycle unit. The first circulation unit comprises a first compressor 1-1, a first condenser 2-1, a first throttle valve 5-1 and a first circulation channel 3-1-1 of a first condensation evaporator 3-1, and the exhaust end of the first compressor 1-1, the first condenser 2-1, the first throttle valve 5-1 and the first circulation channel 3-1-1 of the first condensation evaporator 3-1 are sequentially connected back to the suction end of the first compressor 1-1 to form a closed circulation.
The second circulation unit comprises a second compressor 1-2, a second condenser 2-2, a second circulation channel 3-1-2 of the first condensation evaporator 3-1, a second circulation channel 3-2-2 of the second condensation evaporator 3-2, a first evaporator 7-1, a second throttling valve 5-2, a first one-way valve 6-1, a second one-way valve 6-2, a first three-way reversing valve 4-1 and a second three-way reversing valve 4-2. A schematic structural diagram of the first condensing evaporator 3-1 is shown in fig. 4, a schematic structural diagram of the second condensing evaporator is shown in fig. 5, a schematic interface diagram of the first three-way reversing valve 4-1 is shown in fig. 2, and a schematic interface diagram of the second three-way reversing valve is shown in fig. 3. The air suction end of the second compressor 1-2 is connected with the first interface 4-1-1 of the first three-way reversing valve 4-1, the air discharge end of the second compressor 1-2 is connected with the first interface 4-2-1 of the second three-way reversing valve 4-2, the second interface 4-2-2 of the second three-way reversing valve 4-2 is connected with the inlet of the second condenser 2-2, the outlet of the second condenser 2-2 is respectively connected with the outlet of the first one-way valve 6-1 and the first interface of the second throttle valve 5-2, the second interface of the second throttle valve 5-2 is respectively connected with the first interface of the first evaporator 7-1 and the inlet of the second one-way valve 6-2, and the second interface of the first evaporator 7-1 is connected with the third interface of the first three-way reversing valve 4-1 The port 4-1-3 is connected, one path of an outlet of the second one-way valve 6-2 is connected with an inlet of the first one-way valve 6-1, the other path of the outlet is connected with the second circulation channel 3-1-2 of the first condensation evaporator 3-1 and the first interface of the second circulation channel 3-2-2 of the second condensation evaporator 3-2, and the second interface of the second circulation channel 3-2-2 of the second condensation evaporator 3-2 is respectively connected with the second interface 4-1-2 of the first three-way reversing valve 4-1 and the third interface 4-2-3 of the second three-way reversing valve 4-2.
The third circulation unit comprises a third compressor 1-3, a first circulation channel 3-2-1 of a second condensation evaporator 3-2, a third throttle valve 5-3 and a second evaporator 7-2, and the exhaust end of the third compressor 1-3, the first circulation channel 3-2-1 of the second condensation evaporator 3-2, the third throttle valve 5-3 and the second evaporator 7-2 are sequentially connected back to the suction end of the third compressor to form a closed circulation.
The first compressor 1-1 is a low-power compressor, the second compressor 1-2 is a medium-power compressor, and the third compressor 1-3 is a high-power compressor.
Under the working condition that the single-stage compression refrigeration cycle can meet, only the second circulation unit circularly operates to form the single-stage compression refrigeration cycle. When the single-stage compression refrigeration cycle can not meet the required temperature, the system can realize two different cascade refrigeration cycles according to the required different loads, namely a low-load working condition cascade refrigeration cycle and a high-load working condition cascade refrigeration cycle.
Under the working condition that the single-stage compression refrigeration cycle can meet, only the second circulation unit circularly operates, and the refrigeration system is a single-stage compression refrigeration cycle. In the second circulation unit, the first interface 4-1-1 of the first three-way reversing valve 4-1 is connected with the third interface 4-1-3, and the first interface 4-2-1 of the second three-way reversing valve 4-2 is connected with the second interface 4-2-2. The exhaust end of the second compressor 1-2, the first interface 4-1-1 and the second interface 4-1-2 of the second three-way reversing valve 4-1, the second condenser 2-2, the second throttle valve 5-2, the first evaporator 7-1, the third interface 4-2-3 of the first three-way reversing valve 4-2 and the first interface 4-2-1 are sequentially connected back to the suction end of the second compressor 1-2 to form a closed single-stage compression refrigeration cycle. The second compressor 1-2 sucks low-pressure gas from the first evaporator 7-1, the low-pressure gas is compressed and boosted by the second compressor 1-2 to be changed into high-pressure gas, and then the high-pressure gas enters the second evaporator through the first connector 4-2-1 and the second connector 4-2-2 of the second three-way reversing valve 4-2, the heat is condensed and released in the second condenser 2-2 to become high-pressure liquid, the high-pressure liquid enters the second throttling valve 5-2 to be throttled and depressurized to become low-pressure wet vapor, the low-pressure wet vapor enters the first evaporator 7-1 to be evaporated and absorbed to become low-pressure vapor, and then the low-pressure wet vapor returns to the suction end of the second compressor 1-2 through the third interface 4-1-3 and the first interface 4-1-1 of the first three-way reversing valve 4-1 to complete the single-stage compression refrigeration cycle.
When the single-stage compression refrigeration cycle cannot meet the required temperature and the system is a low-load working condition cascade refrigeration cycle, the first circulation unit and the second circulation unit operate, the refrigeration system is a cascade compression refrigeration system under the low-load working condition, the first circulation unit is a high-temperature stage compression refrigeration cycle, and the second circulation unit is a low-temperature stage compression refrigeration cycle. In the first circulation unit, the exhaust end of the first compressor 1-1, the first condenser 2-1, the first throttle valve 5-1 and the first circulation channel 3-2-1 of the second condensation evaporator 3-2 are sequentially connected back to the suction end of the first compressor, so that a high-temperature stage compression refrigeration cycle is completed. In the second circulation unit, the first interface 4-1-1 of the first three-way reversing valve 4-1 is connected with the third interface 4-1-3, and the first interface 4-2-1 of the second three-way reversing valve 4-2 is connected with the third interface 4-2-3. The exhaust end of the second compressor 1-2, the first interface 4-2-1 and the third interface 4-2-3 of the second three-way reversing valve 4-2, the second circulation channel 3-2-2 of the second condensing evaporator 3-2, the second circulation channel 3-1-2 of the first condensing evaporator 3-1, the first one-way valve 6-1, the second throttle valve 5-2, the first evaporator 7-1, the third interface 4-1-3 of the first three-way reversing valve 4-1 and the first interface 4-1-1 are sequentially connected back to the suction end of the second compressor 1-2, and low-temperature stage compression refrigeration cycle is completed. In the high-temperature stage compression refrigeration cycle, the first compressor 1-1 sucks medium-pressure gas from the first circulation channel 3-2-1 of the second condensation evaporator 3-2, the medium-pressure gas is compressed by the first compressor 1-1 to be changed into high-pressure gas, the high-pressure gas enters the first condenser 2-1 to be condensed and release heat to be high-pressure liquid, the high-pressure liquid is throttled and depressurized by the first throttling valve 5-1 to be changed into medium-pressure wet steam, then the medium-pressure wet steam enters the first circulation channel 3-2-1 of the second condensation evaporator 3-2 to be evaporated, the condensed heat of the low-temperature stage is absorbed to be changed into medium-pressure gas, and then the medium-pressure gas returns to the suction end of the first compressor 1-1, so that the high-temperature stage compression; in the low-temperature stage compression refrigeration cycle, the second compressor 1-2 sucks low-pressure gas from the first evaporator 7-1, the low-pressure gas is compressed into medium-pressure gas through the second compressor 1-2, the medium-pressure gas flows through the first interface 4-2-1 and the third interface 4-2-3 of the second three-way reversing valve 4-2, the medium-pressure gas flows through the second circulation channel 3-2-2 of the second condensing evaporator 3-2 and enters the second circulation channel 3-1-2 of the first condensing evaporator 3-1 to be condensed, the medium-pressure gas is discharged into medium-pressure liquid to a high-temperature stage, the medium-pressure liquid enters the second throttling valve 5-2 through the first one-way valve 6-1 to be throttled and depressurized into low-pressure wet steam, and the low-pressure wet steam enters the first evaporator 7-1 to be evaporated into low-pressure steam, and (3) generating a refrigeration phenomenon, returning low-pressure steam to the air suction end of the second compressor 1-2 through the third interface 4-1-3 and the first interface 4-1-1 of the first three-way reversing valve 4-1 to complete low-temperature stage compression refrigeration circulation, and forming the cascade refrigeration system under the low-load working condition.
When the single-stage compression refrigeration cycle cannot meet the required temperature and the system is a high-load working condition cascade refrigeration cycle, the third cycle unit and the second cycle unit operate, the refrigeration system is a cascade compression refrigeration system under a draft load working condition, the second cycle unit is a high-temperature stage compression refrigeration cycle, and the third cycle unit is a low-temperature stage compression refrigeration cycle. In the second circulation unit, the first interface 4-1-1 of the first three-way reversing valve 4-1 is connected with the second interface 4-1-2, and the first interface 4-2-1 of the second three-way reversing valve 4-2 is connected with the second interface 4-1-2. The exhaust end of the second compressor 1-2, the first interface 4-2-1 and the second interface 4-2-2 of the second three-way reversing valve 4-2, the second condenser 2-2, the second throttle valve 5-2, the second one-way valve 6-2, the second circulation channel 3-1-2 of the first condensing evaporator 3-1, the second circulation channel 3-2-2 of the second condensing evaporator 3-2, the second interface 4-1-2 and the first interface 4-1-1 of the first three-way reversing valve 4-1 are sequentially connected back to the suction end of the second compressor 1-2, and a high-temperature stage compression refrigeration cycle is formed. In the third circulation unit, the exhaust end of the third compressor 1-3, the first circulation channel 3-2-1 of the second condensing evaporator 3-2, the third throttle valve 5-3 and the second evaporator 7-2 are sequentially connected back to the suction end of the third compressor 1-3, so as to form a low-temperature stage compression refrigeration cycle. In the high-temperature stage compression refrigeration cycle, the second compressor 1-2 sucks medium-pressure gas from the second circulation channel 3-1-2 of the first condensation evaporator 3-1, the medium-pressure gas is compressed by the second compressor 1-2 to be changed into high-pressure gas, the high-pressure gas flows through the first connector 4-2-1 and the second connector 4-2-2 of the second three-way reversing valve 4-2 and enters the second condenser 2-2 to be condensed and release heat into high-pressure liquid, the high-pressure liquid enters the second throttling valve 5-2 to be throttled and decompressed to be changed into medium-pressure wet steam, the medium-pressure wet steam flows through the second one-way valve 6-2 and the second circulation channel 3-1-2 of the first condensation evaporator 3-1 to enter the second circulation channel 3-2-2 of the second condensation evaporator 3-2 to be evaporated, after absorbing the condensed heat of the low-temperature stage to be medium-pressure gas, the medium-pressure gas returns to the air suction end of the second compressor 1-2 through the second interface 4-1-2 and the first interface 4-1-1 of the first three-way reversing valve 4-1, and the high-temperature stage compression refrigeration cycle is completed. In the low-temperature stage compression refrigeration cycle, the third compressor 1-3 sucks low-pressure gas from the second evaporator 7-2, the low-pressure gas is compressed into medium-pressure gas through the third compressor 1-3, the medium-pressure gas enters the first circulation channel 3-2-1 of the second condensation evaporator 3-2 to be condensed, the medium-pressure gas is released into medium-pressure liquid in a high-temperature stage through heat release, the medium-pressure liquid is throttled and reduced in pressure through the third throttle valve 5-3 to be changed into low-pressure wet steam, then the low-pressure wet steam enters the second evaporator 7-2 to be evaporated into low-pressure steam to generate a refrigeration phenomenon, and the low-pressure steam returns to the air suction end of the third compressor 1-3 to complete the low-temperature stage compression refrigeration cycle, so that the cascade refrigeration system under a high-load working.
Wherein the first compressor 1-1, the second compressor 1-2 and the third compressor 1-3.
The first throttle valve 5-1, the second throttle valve 5-2 and the third throttle valve 5-3 are electronic expansion valves, thermal expansion valves, capillary tubes or orifice plate throttling devices.
The refrigerating system capable of realizing single-stage compression refrigeration cycle and cascade refrigeration cycle under various load working conditions can realize single-stage compression refrigeration cycle under the working condition that the single-stage compression refrigeration cycle in a refrigeration house can meet; under the condition that the single-stage compression refrigeration cycle in the refrigeration house can not meet the required temperature and load, two cascade refrigeration cycles of a low-load working condition and a high-load working condition are realized; in the whole system, the first circulation unit is a fixed unit and is used as a high-temperature stage circulation of the low-load working condition cascade refrigeration system, the third circulation unit is a fixed unit and is used as a low-temperature stage circulation of the high-load cascade refrigeration system, only the second circulation unit is a variable unit, and the second circulation unit can be used as a single-stage compression refrigeration circulation, a low-temperature stage circulation of the low-load working condition cascade refrigeration system and a high-temperature stage circulation of the high-load working condition cascade refrigeration system. The refrigerating system capable of realizing single-stage compression refrigeration circulation and cascade refrigeration circulation under various load working conditions can realize single-stage compression refrigeration circulation and various cascade refrigeration circulation, and selects an efficient circulation mode under various working conditions, the first circulation unit and the third circulation unit are fixed units, and only the second circulation unit is a variable unit, so that the efficiency of the system is improved, the energy consumption of the system is reduced, and the cost of the system is saved; the condensing evaporator is a common plate heat exchanger and the like, has a simple structure, is convenient to operate, reduces the loss of heat exchange quantity, and improves the heat exchange performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be construed as the protection scope of the present invention.
Claims (5)
1. A refrigeration system suitable for multiple load working conditions is characterized by comprising a first circulation unit, a second circulation unit and a third circulation unit, wherein in the first circulation unit, a discharge end of a first compressor, a first condenser, a first throttle valve and a first circulation channel of a first condensation evaporator are sequentially connected back to a suction end of the first compressor to form a closed circulation;
the second circulation unit comprises a second compressor, a second condenser, a second circulation channel of the first condensation evaporator, a second circulation channel of the second condensation evaporator, a first evaporator, a second throttling valve, a first one-way valve, a second one-way valve, a first three-way reversing valve and a second three-way reversing valve; the second compressor inhale the end with the first interface connection of first three-way reversing valve, the exhaust end of second compressor with the first interface connection of second three-way reversing valve, the second interface of second three-way reversing valve with the entry linkage of second condenser, the export of second condenser respectively with the export of first check valve with the first interface connection of second choke valve, the second interface of second choke valve respectively with the first interface of first evaporimeter with the entry linkage of second check valve, the second interface of first evaporimeter with the third interface connection of first three-way reversing valve, the export of second check valve all the way with the entry linkage of first check valve, another way with first condensation evaporimeter second circulation passageway, the first interface connection of second condensation evaporimeter's second circulation passageway, a second interface of a second circulation channel of the second condensation evaporator is respectively connected with a second interface of the first three-way reversing valve and a third interface of the second three-way reversing valve;
in the third circulation unit, the exhaust end of a third compressor, the first circulation channel of the second condensation evaporator, a third throttle valve and the second evaporator are sequentially connected back to the suction end of the third compressor to form a closed circulation;
the first compressor is a low power compressor, the second compressor is a medium power compressor, and the third compressor is a high power compressor.
2. The refrigeration system suitable for multiple load conditions according to claim 1, wherein when the refrigeration system is a single-stage compression refrigeration cycle, in the second cycle unit, the first port of the first three-way reversing valve is connected with the third port, and the first port of the second three-way reversing valve is connected with the second port; and the exhaust end of the second compressor, the first interface and the second interface of the second three-way reversing valve, the second condenser, the second throttle valve, the first evaporator, the third interface of the first three-way reversing valve and the first interface are sequentially connected back to the air suction end of the second compressor to form a closed single-stage compression refrigeration cycle.
3. The refrigeration system suitable for multiple load working conditions according to claim 1, wherein when the refrigeration system is a cascade compression refrigeration system under a low load working condition, the first circulation unit is a high-temperature stage compression refrigeration cycle, and the second circulation unit is a low-temperature stage compression refrigeration cycle; in the first circulation unit, a discharge end of the first compressor, a first condenser, a first throttle valve and a first circulation channel of the second condensation evaporator are sequentially connected back to a suction end of the first compressor, so that a high-temperature stage compression refrigeration cycle is completed; in the second circulation unit, a first interface of the first three-way reversing valve is connected with a third interface, and a first interface of the second three-way reversing valve is connected with the third interface; the exhaust end of the second compressor, the first interface and the third interface of the second three-way reversing valve, the second circulation channel of the second condensation evaporator, the second circulation channel of the first condensation evaporator, the first one-way valve, the second throttle valve, the first evaporator, the third interface and the first interface of the first three-way reversing valve are sequentially connected back to the suction end of the second compressor, and the low-temperature stage compression refrigeration cycle is completed.
4. The refrigeration system suitable for multiple load working conditions according to claim 1, wherein when the refrigeration system is a cascade compression refrigeration system under a high load working condition, the second circulation unit is a high-temperature stage compression refrigeration cycle, and the third circulation unit is a low-temperature stage compression refrigeration cycle;
in the second circulation unit, a first interface of the first three-way reversing valve is connected with a second interface, and a first interface of the second three-way reversing valve is connected with the second interface;
the exhaust end of the second compressor, the first interface and the second interface of the second three-way reversing valve, the second condenser, the second throttle valve, the second one-way valve, the second circulation channel of the first condensing evaporator, the second circulation channel of the second condensing evaporator, the second interface and the first interface of the first three-way reversing valve are sequentially connected back to the suction end of the second compressor to form a high-temperature stage compression refrigeration cycle;
in the third circulation unit, the exhaust end of the third compressor, the first circulation channel of the second condensation evaporator, the third throttle valve and the second evaporator are sequentially connected back to the suction end of the third compressor, so that a low-temperature stage compression refrigeration cycle is formed.
5. The refrigeration system of claim 1, wherein the first compressor, the second compressor, and the third compressor are each any one of a scroll compressor, a rotary compressor, a screw compressor, and a piston compressor.
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| KR20050062078A (en) * | 2003-12-19 | 2005-06-23 | 엘지전자 주식회사 | Dual refrigerating system |
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