CN211823239U - Ultra-low temperature transcritical cascade refrigeration system - Google Patents
Ultra-low temperature transcritical cascade refrigeration system Download PDFInfo
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- CN211823239U CN211823239U CN201922457133.2U CN201922457133U CN211823239U CN 211823239 U CN211823239 U CN 211823239U CN 201922457133 U CN201922457133 U CN 201922457133U CN 211823239 U CN211823239 U CN 211823239U
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Abstract
An ultra-low temperature transcritical cascade refrigeration system. Single working medium multi-stage compression is generally used for preparing low temperature above-60 ℃ due to the limitation thereof. In recent years, the demand of ultra-low temperature refrigerant technology is gradually increased, and for the temperature range below-80 ℃, a three-stage cascade refrigeration system is adopted in the traditional refrigeration mode. The invention comprises the following components: the ultra-low temperature transcritical cascade refrigeration system and the refrigeration method comprise a high-temperature-stage circulation system taking R404A as a circulation working medium and a low-temperature-stage circulation system taking R14 as a circulation working medium. The invention is used for ultralow temperature transcritical cascade refrigeration.
Description
The technical field is as follows:
the utility model relates to an ultra-low temperature transcritical cascade refrigerating system.
Background art:
single working medium multi-stage compression is generally used for preparing low temperature above-60 ℃ due to the limitation thereof. In recent years, the demand of ultra-low temperature refrigerant technology is gradually increased, and for the temperature range below-80 ℃, a three-stage cascade refrigeration system is adopted in the traditional refrigeration mode.
The utility model has the following contents:
the utility model aims at solving the above existing problem, provide an utilize ultra-low temperature refrigerant R14 and well low temperature refrigerant R404A to carry out the ultra-low temperature transcritical refrigerating system of overlapping.
The above purpose is realized by the following technical scheme:
an ultra-low temperature transcritical cascade refrigeration system comprises a high-temperature stage circulation system taking R404A as a circulation working medium and a low-temperature stage circulation system taking R14 as the circulation working medium;
the high-temperature stage circulating system comprises an R404A compressor, wherein the outlet of the R404A compressor is connected with the inlet of an air-cooled condenser through a pipeline, the outlet of the air-cooled condenser is connected with the inlet of an R404A liquid storage device through a pipeline, the outlet of the R404A liquid storage device is connected with the inlet of an R404A electronic expansion valve through a pipeline, the outlet of an R404A electronic expansion valve is connected with the inlet of an evaporative condenser through a pipeline, the outlet of the evaporative condenser is connected with the inlet of an R404A gas-liquid separator through a pipeline, and the outlet of the R404A gas-liquid separator is connected with the inlet of the R404A compressor through a pipeline;
the low temperature stage circulation system include the R14 compressor, the export of R14 compressor and the entry of air-cooled condenser pass through the tube coupling, the export of air-cooled condenser and evaporative condenser's entry pass through the tube coupling, evaporative condenser's export and the entry of R14 reservoir pass through the tube coupling, the export of R14 reservoir and the entry of regenerator pass through the tube coupling, the export of regenerator and R14 electronic expansion valve entry pass through the tube coupling, the export of R14 electronic expansion valve and the entry of evaporator pass through the tube coupling, the entry of evaporator export and regenerator opposite side pass through the tube coupling, the export of regenerator opposite side and gas-liquid separator's entry pass through the tube coupling, the export of R14 gas-liquid separator with the entry of R14 compressor pass through the tube coupling.
In the ultra-low temperature transcritical cascade refrigeration system, the R14 compressor is a high pressure-bearing compressor.
The ultra-low temperature transcritical cascade refrigeration system is characterized in that the air-cooled condenser is a dual-system air-cooled condenser.
A refrigeration method of an ultra-low temperature transcritical cascade refrigeration system comprises the following steps:
the part of the R404A used as the circulating working medium is compressed by an R404A compressor and then enters an air-cooled condenser to exchange heat with air, the heat-released R404A is condensed into high-pressure liquid and enters an R404A liquid storage device, the liquid enters an evaporative condenser through an electronic expansion valve to be evaporated into low-temperature R14 condensation to provide cold energy, and the heat-absorbed R404A returns to an air return port of the compressor through an R404A gas-liquid separator to complete circulation;
the part of R14 as the cycle working medium belongs to transcritical cycle, R14 compressor compresses R14 low pressure gas, the gas enters an air-cooled condenser to exchange heat with air and be cooled, the gas enters an evaporative condenser to exchange heat with R404A, high temperature and high pressure R14 gas is condensed, the condensed R14 enters a heat regenerator through a liquid storage device, after being supercooled in the heat regenerator, the gas enters a tail end evaporator through an electronic expansion valve to provide cold energy for the tail end, and the heat absorbed R14 gas enters an air return port of the R14 compressor through an R14 gas-liquid separator after the heat regenerator is overheated to complete the cycle.
Has the advantages that:
1. the utility model discloses critical refrigerating system has been adopted to super low temperature, but the circulation of R14 part belongs to transcritical circulation process, has adopted the compressor of high pressure-bearing, the state of the high exhaust pressure operation of R14. And the air-cooled condenser in the system is of a double-system structure, and can reduce the temperature by respectively using the outdoor air as the exhaust air of R14 and the exhaust air of R404A. The regenerator in the system provides subcooling for the R14 liquid, improving the refrigeration efficiency of the system. The ultralow temperature refrigeration system with the lowest evaporation temperature of-110 ℃ can be obtained by two-stage overlapping.
The utility model discloses a refrigerant do not have the destruction to the ozone layer, and the ozone layer destroys the latent energy and is 0. Among them, R14 is a colorless, odorless, tasteless, nonflammable gas, and is one of the most stable organic compounds.
The utility model discloses the air-cooled condenser who chooses for use is dual system air-cooled condenser, can be R14's exhaust and R404A's exhaust cooling respectively through outdoor air.
The utility model discloses increased the super-cooled degree that the regenerator improved R14 liquid and the superheat degree of R14 return air in R14's cycle process, improved the refrigeration efficiency of system.
Description of the drawings:
FIG. 1 is a schematic diagram of the present invention;
in the figure: 1. R404A compressor; 2. an air-cooled condenser; 3. R404A reservoir; 4. R404A electronic expansion valve; 5. an evaporative condenser; 6. R404A gas-liquid separator; 7. a R14 compressor; 8. a reservoir of R14; 9. A heat regenerator; 10. r14 electronic expansion valve; 11. an evaporator; 12. r14 gas-liquid separator.
The specific implementation mode is as follows:
example 1:
an ultra-low temperature transcritical cascade refrigeration system comprises a high-temperature stage circulation system taking R404A as a circulation working medium and a low-temperature stage circulation system taking R14 as the circulation working medium;
the high-temperature stage circulating system comprises an R404A compressor 1, wherein the outlet of the R404A compressor is connected with the inlet of an air-cooled condenser 2 through a pipeline, the outlet of the air-cooled condenser is connected with the inlet of an R404A liquid storage device 3 through a pipeline, the outlet of the R404A liquid storage device is connected with the inlet of an R404A electronic expansion valve 4 through a pipeline, the R404A electronic expansion valve is connected with the inlet of an evaporative condenser 5 through a pipeline, the outlet of the evaporative condenser is connected with the inlet of an R404A gas-liquid separator 6 through a pipeline, and the R404A gas-liquid separator is connected with the inlet of the R404A compressor through a pipeline;
the low-temperature stage circulating system comprises an R14 compressor 7, the outlet of the R14 compressor is connected with the inlet of the air-cooled condenser through a pipeline, the outlet of the air-cooled condenser is connected with the inlet of the evaporative condenser through a pipeline, the outlet of the evaporative condenser is connected with the inlet of the R14 liquid storage device 8 through a pipeline, the outlet of the R14 liquid storage tank is connected with the inlet of the regenerator 9 through a pipeline, the outlet of the regenerator is connected with the inlet of the R14 electronic expansion valve 10 through a pipeline, the outlet of the R14 electronic expansion valve is connected with the inlet of the evaporator 11 through a pipeline, the outlet of the evaporator is connected with the inlet of the other side of the regenerator through a pipeline, the other side outlet of the regenerator is connected with the inlet of the R14 gas-liquid separator 12 through a pipeline, the outlet of the R14 gas-liquid separator is connected with the inlet of the R14 compressor through a pipeline.
Example 2:
according to the ultra-low temperature transcritical cascade refrigeration system of embodiment 1, the R14 compressor is a high pressure-bearing compressor.
Example 3:
according to the ultra-low temperature transcritical cascade refrigeration system of embodiment 1 or 2, the air-cooled condenser is a dual-system air-cooled condenser.
Example 4:
a refrigeration method of an ultra-low temperature transcritical cascade refrigeration system comprises the following steps:
the part of the R404A used as the circulating working medium is compressed by an R404A compressor and then enters an air-cooled condenser to exchange heat with air, the heat-released R404A is condensed into high-pressure liquid and enters an R404A liquid storage device, the liquid enters an evaporative condenser through an electronic expansion valve to be evaporated into low-temperature R14 condensation to provide cold energy, and the heat-absorbed R404A returns to an air return port of the compressor through an R404A gas-liquid separator to complete circulation;
the part of R14 as the cycle working medium belongs to transcritical cycle, R14 compressor compresses R14 low pressure gas, the gas enters an air-cooled condenser to exchange heat with air and be cooled, the gas enters an evaporative condenser to exchange heat with R404A, high temperature and high pressure R14 gas is condensed, the condensed R14 enters a heat regenerator through a liquid storage device, after being supercooled in the heat regenerator, the gas enters a tail end evaporator through an electronic expansion valve to provide cold energy for the tail end, and the heat absorbed R14 gas enters an air return port of the R14 compressor through an R14 gas-liquid separator after the heat regenerator is overheated to complete the cycle.
The system is suitable for occasions requiring lower evaporation temperature, such as: biological research, industrial low temperature tests, storage of medical supplies, and the like.
Claims (3)
1. An ultra-low temperature transcritical cascade refrigeration system is characterized in that: the ultra-low temperature transcritical cascade refrigeration system comprises a high-temperature stage circulation system taking R404A as a circulation working medium and a low-temperature stage circulation system taking R14 as a circulation working medium;
the high-temperature stage circulating system comprises an R404A compressor, wherein the outlet of the R404A compressor is connected with the inlet of an air-cooled condenser through a pipeline, the outlet of the air-cooled condenser is connected with the inlet of an R404A liquid storage device through a pipeline, the outlet of the R404A liquid storage device is connected with the inlet of an R404A electronic expansion valve through a pipeline, the outlet of an R404A electronic expansion valve is connected with the inlet of an evaporative condenser through a pipeline, the outlet of the evaporative condenser is connected with the inlet of an R404A gas-liquid separator through a pipeline, and the outlet of the R404A gas-liquid separator is connected with the inlet of the R404A compressor through a pipeline;
the low temperature stage circulation system include the R14 compressor, the export of R14 compressor and the entry of air-cooled condenser pass through the tube coupling, the export of air-cooled condenser and evaporative condenser's entry pass through the tube coupling, evaporative condenser's export and the entry of R14 reservoir pass through the tube coupling, the export of R14 reservoir and the entry of regenerator pass through the tube coupling, the export of regenerator and R14 electronic expansion valve entry pass through the tube coupling, R14 electronic expansion valve export and evaporator entry pass through the tube coupling, the entry of evaporator export and regenerator opposite side pass through the tube coupling, the export of regenerator opposite side and the entry of R14 vapour and liquid separator pass through the tube coupling, the export of R14 vapour and liquid separator with the entry of R14 compressor pass through the tube coupling.
2. The ultra-low temperature transcritical cascade refrigeration system as claimed in claim 1, wherein: the R14 compressor is a high pressure-bearing compressor.
3. The ultra-low temperature transcritical cascade refrigeration system as claimed in claim 2, wherein: the air-cooled condenser is a double-system air-cooled condenser.
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| CN201922457133.2U CN211823239U (en) | 2019-12-31 | 2019-12-31 | Ultra-low temperature transcritical cascade refrigeration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887266A (en) * | 2019-12-31 | 2020-03-17 | 黑龙江爱科德科技有限公司 | Ultra-low temperature transcritical cascade refrigeration system and refrigeration method |
| CN113175762A (en) * | 2021-04-13 | 2021-07-27 | 西安交通大学 | Synergistic self-cascade refrigeration circulating system of two-phase ejector and control method |
-
2019
- 2019-12-31 CN CN201922457133.2U patent/CN211823239U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110887266A (en) * | 2019-12-31 | 2020-03-17 | 黑龙江爱科德科技有限公司 | Ultra-low temperature transcritical cascade refrigeration system and refrigeration method |
| CN113175762A (en) * | 2021-04-13 | 2021-07-27 | 西安交通大学 | Synergistic self-cascade refrigeration circulating system of two-phase ejector and control method |
| CN113175762B (en) * | 2021-04-13 | 2022-08-05 | 西安交通大学 | Synergistic self-cascade refrigeration circulating system of two-phase ejector and control method |
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