CN114719471A - Mixed refrigerant refrigerating system and refrigerating method - Google Patents
Mixed refrigerant refrigerating system and refrigerating method Download PDFInfo
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- CN114719471A CN114719471A CN202210217817.9A CN202210217817A CN114719471A CN 114719471 A CN114719471 A CN 114719471A CN 202210217817 A CN202210217817 A CN 202210217817A CN 114719471 A CN114719471 A CN 114719471A
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- electromagnetic valve
- refrigerant
- storage tank
- compressor
- capillary tube
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/385—Dispositions with two or more expansion means arranged in parallel on a refrigerant line leading to the same evaporator
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
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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
- F25B2600/00—Control issues
- F25B2600/05—Refrigerant levels
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2519—On-off valves
Abstract
The invention discloses a mixed refrigerant refrigerating system and a refrigerating method, and belongs to the technical field of mixed working medium refrigeration. According to the invention, a mixed working medium refrigerant R290/R600a and a double-capillary system are adopted, wherein a main capillary and an auxiliary capillary are connected in parallel, the main capillary is opened under a low-temperature working condition to obtain a low temperature of-40 ℃, and the main capillary and the auxiliary capillary are opened under a normal-cooling working condition to increase the flow of the system, so that the system is more reasonably matched, and the energy-saving effect is achieved; the air storage tanks are added at two ends of the compressor, the circulating amount of the refrigerant in the circulation is controlled by the high-pressure valve and the low-pressure valve, and the mixed refrigerant component is adjusted to a certain degree, so that the requirements of different refrigerating capacities, different refrigerating temperatures and different cooling speeds can be flexibly met; the gas holder also can play the effect of traditional reservoir simultaneously through the refrigerant circulation volume in the adjustment system, solves the compressor liquid impact problem promptly.
Description
Technical Field
The invention belongs to the technical field of mixed working medium refrigeration, and particularly relates to a mixed refrigerant refrigeration system and a refrigeration method.
Background
With the rapid development of economic society of China and the remarkable enhancement of comprehensive national force, the living standard of urban and rural residents is remarkably improved, more and more high-end food materials such as tunas and salmon appear on dining tables of common people, the storage temperature of the high-end food materials is required to be lower, and the storage requirements of the high-end food materials cannot be met by traditional refrigerators and refrigerators at the temperature of-18 ℃ to-24 ℃.
The existing traditional product with the function of-40 ℃ adopts a R290 single refrigerant and single capillary system, and a pure R290 system can easily obtain low temperature but has high exhaust pressure, low energy efficiency, large product noise and high energy consumption; or R290/R600a mixed refrigerant and a single capillary tube system are adopted, the noise and the energy consumption can be reduced to a certain extent by the R290/R600a mixed refrigerant, but the flow of the single capillary tube system can not be adjusted, the flow of the capillary tube is small in order to meet the working condition of-40 ℃, and when the working condition is converted into the normal cooling working condition of-18 ℃, the flow is not consistent with the actual requirement of the system, the pressure ratio is too large, the power of the compressor is increased, and the noise is too large, so that the user experience is seriously influenced. Moreover, the energy consumption is high, and the cost for storing food is expensive for users.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a mixed refrigerant refrigerating system and a refrigerating method, which are reasonable in design, overcome the defects of the prior art and have good effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mixed refrigerant refrigerating system comprises a compressor, a condenser, a drying filter, a main capillary tube, an auxiliary capillary tube, an evaporator and a gas storage tank; the compressor, the condenser, the drying filter, the main capillary tube and the evaporator are sequentially connected through a pipeline; the auxiliary capillary tube is connected with the main capillary tube in parallel, and the liquid inlet end of the auxiliary capillary tube is provided with an electromagnetic valve V1; the low-pressure end of the air storage tank is provided with an electromagnetic valve V2, and the high-pressure end of the air storage tank is provided with an electromagnetic valve V3; the gas storage tank is connected with the two electromagnetic valves in series and then connected with the compressor in parallel.
Preferably, the refrigerant includes R290 working fluid and R600a working fluid.
In addition, the invention also provides a mixed refrigerant refrigerating method, which adopts the mixed refrigerant refrigerating system as follows:
when the refrigeration system operates in the normal cooling mode:
the electromagnetic valve V1 is opened, double capillary tubes are adopted for operation, the flow of refrigerant in the system is increased, the low-pressure end electromagnetic valve V2 of the air storage tank keeps closed when the compressor is started for the first time, the high-pressure end electromagnetic valve V3 is opened, the electromagnetic valve V3 is opened for 10min and then is closed, and part of refrigerant is stored in the air storage tank; if the mode conversion does not exist in the subsequent operation process, the electromagnetic valve V2 and the electromagnetic valve V3 are kept in a closed state;
when the refrigeration system operates in a deep cooling mode:
the electromagnetic valve V1 is closed, only the main capillary tube operates, the system flow is reduced, the high-pressure end electromagnetic valve V3 of the air storage tank keeps a closed state when the compressor is started, the low-pressure end electromagnetic valve V2 is opened, the low-pressure end electromagnetic valve V2 is closed after 20min, the mixed refrigerant stored in the air storage tank is sucked into the refrigerating system and participates in the deep cooling mode operation of the refrigerating system, and the electromagnetic valve V2 and the electromagnetic valve V3 keep a closed state if no mode conversion exists in the subsequent operation process.
The invention has the following beneficial technical effects:
according to the invention, a mixed working medium refrigerant R290/R600a and a double-capillary system are adopted, wherein a main capillary and an auxiliary capillary are connected in parallel, the main capillary is opened under a low-temperature working condition to obtain a low temperature of-40 ℃, and the main capillary and the auxiliary capillary are opened under a normal-cooling working condition to increase the flow of the system, so that the system is more reasonably matched, and the energy-saving effect is achieved; the air storage tanks are added at two ends of the compressor, the refrigerant circulation amount in the circulation is controlled by high-pressure and low-pressure valves, and the mixed refrigerant components are adjusted to a certain degree, so that the requirements of different refrigerating capacities, different refrigerating temperatures and different cooling speeds can be flexibly met; the gas holder also can play the effect of traditional reservoir simultaneously through the refrigerant circulation volume in the adjustment system, solves the compressor liquid impact problem promptly.
The invention adopts a binary mixed working medium refrigerating system, so that the refrigerant is formed by mixing the R290 working medium and the R600a working medium, the proportion of the two working media is regulated, the temperature in the storage chamber of the freezer can reach about-40 ℃, and the better fresh-keeping effect on the food stored in the storage chamber is achieved.
The invention has the advantages that the common cooling mode saves energy and reduces noise; the deep cooling mode is used for quickly cooling, obtaining lower temperature and reducing noise.
Drawings
Fig. 1 is a schematic diagram of a refrigeration system in embodiment 1 of the present invention;
wherein, 1-compressor; 2-a condenser; 3-drying the filter; 4-a primary capillary; 5-an auxiliary capillary; 6-an evaporator; 7-a gas storage tank;
FIG. 2 is a refrigerant flow diagram of the refrigeration system in the normal cooling mode according to embodiment 1 of the present invention;
fig. 3 is a refrigerant flow diagram in the cryogenic mode of the refrigeration system in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of a system in which an electromagnetic valve is added to the liquid inlet end of a main capillary in embodiment 3 of the present invention;
fig. 5 is a refrigerant flow diagram of the refrigeration system in the normal cooling mode in the embodiment 3 of the invention;
fig. 6 is a refrigerant flow diagram in the cryogenic mode of the refrigeration system in embodiment 3 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
as shown in fig. 1, a mixed refrigerant refrigeration system includes a compressor 1, a condenser 2, a dry filter 3, a main capillary tube 4, an auxiliary capillary tube 5, an evaporator 6, and a gas storage tank 7; the compressor 1, the condenser 2, the drying filter 3, the main capillary tube 4 and the evaporator 6 are connected in sequence through pipelines; the auxiliary capillary 5 is connected with the main capillary 4 in parallel, and the liquid inlet end of the auxiliary capillary 5 is provided with an electromagnetic valve V1; the low-pressure end of the air storage tank 7 is provided with an electromagnetic valve V2, and the high-pressure end of the air storage tank 7 is provided with an electromagnetic valve V3; the air storage tank 7 is connected with the two electromagnetic valves in series and then connected with the compressor 1 in parallel.
The refrigerant comprises R290 working medium and R600a working medium.
The system flow required by the common cooling mode at the temperature of 18 ℃ below zero in actual operation is large, the electromagnetic valve V1 is opened, the capillary tube 5 is assisted in the system operation to improve the system flow, and the system operation efficiency can be improved; meanwhile, because R600a in the mixed refrigerant refrigeration system is more easily dissolved in the refrigerant oil of the compressor and R600a in the evaporator is higher in boiling point and more easily subjected to liquid phase accumulation, the ratio of the refrigerant R290 with the low boiling point at the exhaust end of the compressor is higher than the ratio of the components during charging, after a part of refrigerant is stored in the gas storage tank 7, the total amount of the refrigerant participating in circulation is less, the ratio of R600a is increased, the system is more energy-saving, and meanwhile, the ratio of R600a is higher than the ratio of R600a, so that the exhaust pressure can be reduced to realize noise reduction; the system flow required by the deep cooling mode is small, the total amount of the refrigerant participating in circulation is large, and the R290 proportion is high, so that the target temperature of 40 ℃ below zero can be obtained, and meanwhile, the compression ratio can be reduced by the large refrigerant filling amount, and the noise of the deep cooling mode is reduced.
Example 2:
on the basis of the embodiment 1, the invention also provides a mixed refrigerant refrigeration method, which comprises the following specific steps:
when the refrigeration system operates in the normal cooling mode (the flow chart is shown in fig. 2):
the electromagnetic valve V1 is opened, double capillary tubes are adopted for operation, the flow of refrigerant in the system is increased, the low-pressure end electromagnetic valve V2 of the air storage tank keeps closed when the compressor is started for the first time, the high-pressure end electromagnetic valve V3 is opened, the electromagnetic valve V3 is opened for 10min and then is closed, and part of refrigerant is stored in the air storage tank; if the mode conversion does not exist in the subsequent operation process, the electromagnetic valve V2 and the electromagnetic valve V3 are kept in a closed state;
when the refrigerating system operates in a deep cooling mode (the flow of the refrigerating system is shown in figure 3):
the electromagnetic valve V1 is closed, only the main capillary tube operates, the system flow is reduced, the high-pressure end electromagnetic valve V3 of the air storage tank keeps a closed state when the compressor is started, the low-pressure end electromagnetic valve V2 is opened, the low-pressure end electromagnetic valve V2 is closed after 20min, the mixed refrigerant stored in the air storage tank is sucked into the refrigerating system and participates in the deep cooling mode operation of the refrigerating system, and the electromagnetic valve V2 and the electromagnetic valve V3 keep a closed state if no mode conversion exists in the subsequent operation process.
Example 3:
the liquid inlet end of the main capillary is additionally provided with an electromagnetic valve, and the two electromagnetic valves are respectively opened under two working conditions;
as shown in fig. 4, a mixed refrigerant refrigeration system includes a compressor 1, a condenser 2, a dry filter 3, a main capillary 4, an auxiliary capillary 5, an evaporator 6, and a gas storage tank 7; the compressor 1, the condenser 2, the drying filter 3, the main capillary tube 4 and the evaporator 6 are connected in sequence through pipelines; the auxiliary capillary 5 is connected with the main capillary 4 in parallel, and the liquid inlet end of the auxiliary capillary 5 is provided with an electromagnetic valve V1; the liquid inlet end of the main capillary 4 is provided with an electromagnetic valve V4; the low-pressure end of the air storage tank 7 is provided with an electromagnetic valve V2, and the high-pressure end of the air storage tank 7 is provided with an electromagnetic valve V3; the air storage tank 7 is connected with the two electromagnetic valves in series and then connected with the compressor 1 in parallel.
Example 4:
on the basis of the above embodiment 3, the present invention further provides a mixed refrigerant refrigeration method, which specifically comprises the following steps:
when the refrigeration system operates in the normal cooling mode (the flow chart is shown in fig. 5):
in the normal cooling mode, the electromagnetic valve V1 is opened, the electromagnetic valve V4 is closed, and the auxiliary capillary with larger flow participates in the system operation; the flow of the refrigerant in the system is increased, the electromagnetic valve V2 is closed, the electromagnetic valve V3 is opened for 10min and then is closed, part of the refrigerant is stored in the air storage tank 7, and the rest of the refrigerant participates in the normal cooling mode operation of the system.
When the refrigeration system operates in the deep cooling mode (the flow of the refrigeration system is shown in fig. 6):
in the deep cooling mode, the electromagnetic valve V4 is opened, the electromagnetic valve V1 is closed, and the main capillary with low flow participates in the system operation; the flow of the refrigerant in the system is reduced, the electromagnetic valve V3 is closed, the electromagnetic valve V2 is opened for 20min and then is closed, and part of the refrigerant stored in the air storage tank 7 is sucked into the system and participates in the deep cooling mode operation of the system.
The key points of the invention are as follows:
the system is provided with a main capillary tube and an auxiliary capillary tube, wherein the auxiliary capillary tube is opened in a common mode, the main capillary tube and the auxiliary capillary tube run simultaneously, the auxiliary capillary tube is closed in a deep cooling mode, and only the main capillary tube runs.
The air storage tank with the electromagnetic valve control is added at the two ends of the compressor: in the normal cooling mode, the high-pressure valve V3 is opened for a period of time and then closed, a part of refrigerant is stored in the air storage tank, excessive refrigerant of the system is reduced, and the component ratio of R600a in the actual circulation is improved. In the deep cooling mode, the electromagnetic valve V2 is opened, the mixed refrigerant stored in the gas storage tank is sucked into the system and participates in the deep cooling mode operation of the system, the requirement of more refrigerant quantity in the low-temperature operation of the system is met, and meanwhile the component proportion of R290 in the circulation of the actual system is improved.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (3)
1. A mixed refrigerant refrigeration system characterized by: comprises a compressor, a condenser, a dry filter, a main capillary tube, an auxiliary capillary tube, an evaporator and a gas storage tank; the compressor, the condenser, the drying filter, the main capillary tube and the evaporator are sequentially connected through a pipeline; the auxiliary capillary tube is connected with the main capillary tube in parallel, and the liquid inlet end of the auxiliary capillary tube is provided with an electromagnetic valve V1; the low-pressure end of the air storage tank is provided with an electromagnetic valve V2, and the high-pressure end of the air storage tank is provided with an electromagnetic valve V3; the gas storage tank is connected with the two electromagnetic valves in series and then connected with the compressor in parallel.
2. The mixed refrigerant refrigeration system of claim 1, wherein: the refrigerant comprises R290 working medium and R600a working medium.
3. A mixed refrigerant refrigeration method is characterized in that: the mixed refrigerant refrigeration system according to claim 1, comprising:
when the refrigeration system operates in the normal cooling mode:
the electromagnetic valve V1 is opened, double capillary tubes are adopted for operation, the flow of refrigerant in the system is increased, the low-pressure end electromagnetic valve V2 of the air storage tank keeps closed when the compressor is started for the first time, the high-pressure end electromagnetic valve V3 is opened, the electromagnetic valve V3 is opened for 10min and then is closed, and part of refrigerant is stored in the air storage tank; if the mode conversion does not exist in the subsequent operation process, the electromagnetic valve V2 and the electromagnetic valve V3 are kept in a closed state;
when the refrigeration system operates in a deep cooling mode:
the electromagnetic valve V1 is closed, only the main capillary tube operates, the system flow is reduced, the high-pressure end electromagnetic valve V3 of the air storage tank keeps a closed state when the compressor is started, the low-pressure end electromagnetic valve V2 is opened, the low-pressure end electromagnetic valve V2 is closed after 20min, the mixed refrigerant stored in the air storage tank is sucked into the refrigerating system and participates in the deep cooling mode operation of the refrigerating system, and the electromagnetic valve V2 and the electromagnetic valve V3 keep a closed state if no mode conversion exists in the subsequent operation process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210217817.9A CN114719471A (en) | 2022-03-08 | 2022-03-08 | Mixed refrigerant refrigerating system and refrigerating method |
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| CN202210217817.9A CN114719471A (en) | 2022-03-08 | 2022-03-08 | Mixed refrigerant refrigerating system and refrigerating method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220163238A1 (en) * | 2020-11-20 | 2022-05-26 | Samsung Electronics Co., Ltd. | Refrigerator |
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| JPH03217760A (en) * | 1990-01-22 | 1991-09-25 | Daikin Ind Ltd | Refrigerating cycle apparatus |
| CN101128707A (en) * | 2005-09-08 | 2008-02-20 | 大冷股份有限公司 | Control system for refrigerating machine employing non-azeotropic refrigerant |
| CN105066491A (en) * | 2015-07-31 | 2015-11-18 | 华南理工大学 | Single-stage mixed working medium low-temperature refrigeration system and control method thereof |
| CN105972846A (en) * | 2016-06-22 | 2016-09-28 | 海信容声(广东)冷柜有限公司 | Overpressure-preventing mixed working medium low-temperature refrigeration system and control method thereof |
| CN106949683A (en) * | 2017-04-27 | 2017-07-14 | 华南理工大学 | A kind of flexible control pressure system and its operation method of mixed working fluid cryogenic refrigeration cooling |
| CN108286836A (en) * | 2018-01-16 | 2018-07-17 | 海信容声(广东)冷柜有限公司 | A kind of mixed working fluid cryogenic refrigerating system and refrigerating device |
-
2022
- 2022-03-08 CN CN202210217817.9A patent/CN114719471A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03217760A (en) * | 1990-01-22 | 1991-09-25 | Daikin Ind Ltd | Refrigerating cycle apparatus |
| CN101128707A (en) * | 2005-09-08 | 2008-02-20 | 大冷股份有限公司 | Control system for refrigerating machine employing non-azeotropic refrigerant |
| CN105066491A (en) * | 2015-07-31 | 2015-11-18 | 华南理工大学 | Single-stage mixed working medium low-temperature refrigeration system and control method thereof |
| CN105972846A (en) * | 2016-06-22 | 2016-09-28 | 海信容声(广东)冷柜有限公司 | Overpressure-preventing mixed working medium low-temperature refrigeration system and control method thereof |
| CN106949683A (en) * | 2017-04-27 | 2017-07-14 | 华南理工大学 | A kind of flexible control pressure system and its operation method of mixed working fluid cryogenic refrigeration cooling |
| CN108286836A (en) * | 2018-01-16 | 2018-07-17 | 海信容声(广东)冷柜有限公司 | A kind of mixed working fluid cryogenic refrigerating system and refrigerating device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220163238A1 (en) * | 2020-11-20 | 2022-05-26 | Samsung Electronics Co., Ltd. | Refrigerator |
| US11686505B2 (en) * | 2020-11-20 | 2023-06-27 | Samsung Electronics Co., Ltd. | Refrigerator |
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