CN104567068A - Cascade refrigeration system - Google Patents
Cascade refrigeration system Download PDFInfo
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- CN104567068A CN104567068A CN201510021572.2A CN201510021572A CN104567068A CN 104567068 A CN104567068 A CN 104567068A CN 201510021572 A CN201510021572 A CN 201510021572A CN 104567068 A CN104567068 A CN 104567068A
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- temperature level
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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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- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
A cascade refrigeration system comprises a high-temperature-class circulation loop, a low-temperature-class circulation loop and an evaporative condenser for connecting the high-temperature-class circulation loop with the low-temperature-class circulation loop, wherein the evaporative condenser comprises a low-temperature condenser located on one side and a high-temperature condenser located on the other side, the low-temperature condenser is connected in the low-temperature-class circulation loop, the high-temperature condenser is connected in the high-temperature-class circulation loop, and a pre-cooler is connected in the low-temperature-class circulation loop and is located in front of the evaporative condenser. The pre-cooler is arranged in a low-temperature-class circulation system and is located in front of the evaporative condenser, so that a low-temperature-class refrigerant can be cooled to be at certain temperature before flowing into the low-temperature condenser of the evaporative condenser, the temperature difference between a high-temperature evaporator and the low-temperature condenser is reduced, the reliability is improved, the service life is prolonged, the lower the temperature difference is, irreversible heat loss is lower, heat exchange efficiency can be also improved, and the performance of the unit can be improved.
Description
Technical field
the present invention relates to a kind of overlapping refrigeration system.
Background technology
in prior art, current refrigerator component is single system and overlapping refrigeration system two class, when needs lower temperature, adopts overlapping refrigeration system often.Overlapping refrigeration system is widely used in the field such as processing, transport, storage of commercial food or medicine, plays an important role, as shopping supermarket, pharmacy corporation, marine fishing etc. in the guaranteeing the quality etc. of fresh-keeping, medicine of food.Overlapping refrigeration system generally includes high-temperature level closed circuit, low-temperature level closed circuit, evaporative condenser (except three system overlappings) for being connected with described low-temperature level closed circuit by described high-temperature level closed circuit, by evaporative condenser, the heat of low-temperature level closed circuit is passed to high-temperature level closed circuit.Described evaporative condenser comprises the low-temperature level condenser being positioned at side, the high-temperature level evaporimeter being positioned at opposite side, described low-temperature level condenser is connected in described low-temperature level closed circuit, the temperature of low-temperature level condenser can reach 80 DEG C, described high-temperature level evaporimeter is connected in described high-temperature level closed circuit, temperature is lower, only has about 0 DEG C.Namely the temperature difference of evaporative condenser is comparatively large, easily produces larger stress, bursting by freezing heat exchanger, and heat loss is also comparatively large, reduces the heat exchange property of heat exchanger.
Summary of the invention
the technical problem to be solved in the present invention is to provide a kind of overlapping refrigeration system.
in order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of overlapping refrigeration system, comprise high-temperature level closed circuit, low-temperature level closed circuit, by the evaporative condenser that described high-temperature level closed circuit is connected with described low-temperature level closed circuit, described evaporative condenser comprises the low-temperature level condenser being positioned at side, be positioned at the high-temperature level evaporimeter of opposite side, described low-temperature level condenser is connected in described low-temperature level closed circuit, described high-temperature level evaporimeter is connected in described high-temperature level closed circuit, forecooler is connected with in described low-temperature level closed circuit, before described forecooler is positioned at described evaporative condenser.
in some embodiments, described low-temperature level closed circuit is connected and composed by low-temperature level compressor, the second oil eliminator, described forecooler, described evaporative condenser, the second reservoir, the second device for drying and filtering, the second expansion valve, air cooler dedicated, the second gas-liquid separator head and the tail successively.
in some further embodiment, described high-temperature level closed circuit is connected and composed by high-temperature level compressor, the first oil eliminator, high-temperature level condenser, the first reservoir, the first device for drying and filtering, freezing magnetic valve, the first expansion valve, described evaporative condenser, the first gas-liquid separator head and the tail successively.
in some further embodiment, described overlapping refrigeration system comprises high-temperature level condensation fan, described high-temperature level condenser and described forecooler are respectively fin-tube heat exchanger, described high-temperature level condensation fan to described for blowing described high-temperature level condenser and described forecooler simultaneously.
in some embodiments, described high-temperature level closed circuit adopts R134a or R404a environmental protection refrigerant.
in some embodiments, described low-temperature level closed circuit adopts R774 or R404a environmental protection refrigerant.
in some embodiments, described evaporative condenser is the one in plate type heat exchanger, double pipe heat exchanger, described shell and tube exchanger.
scope of the present invention, is not limited to the technical scheme of the particular combination of above-mentioned technical characteristic, also should contain simultaneously and be undertaken being combined by above-mentioned technical characteristic or its equivalent feature and other technical scheme of being formed.The technical characteristic that such as, disclosed in above-mentioned feature and the application (but being not limited to) has similar functions is replaced mutually and the technical scheme etc. formed.
because technique scheme is used, the present invention compared with prior art has following advantages: the present invention is in the low-temperature level circulatory system and be provided with forecooler before evaporative condenser, low-temperature level refrigerant can be made like this before the low-temperature level condenser entering evaporative condenser to be cooled to uniform temperature, thus the temperature difference reduced between high-temperature level evaporimeter and low-temperature level condenser, increase reliability, increase the service life, and the temperature difference is less, irreversible heat loss is less, also can improve heat exchange efficiency, improve the performance of unit.
Accompanying drawing explanation
accompanying drawing 1 is present system schematic diagram;
wherein: 1, high-temperature level compressor; 2, the first oil eliminator; 3, high-temperature level condenser; 4, high-temperature level condensation fan; 5, the first reservoir; 6, the first device for drying and filtering; 7, freezing magnetic valve; 8, the first expansion valve; 9, evaporative condenser; 91, high-temperature level evaporimeter; 92, low-temperature level condenser; 10, the first gas-liquid separator; 11, low-temperature level compressor; 12, the second oil eliminator; 13, forecooler; 14, the second reservoir; 15, the second device for drying and filtering; 16, the second expansion valve; 17, air-cooler; 18, the second gas-liquid separator.
Detailed description of the invention
as shown in Figure 1, a kind of overlapping refrigeration system, comprises high-temperature level closed circuit, low-temperature level closed circuit, evaporative condenser 9.High-temperature level closed circuit is connected with low-temperature level closed circuit by evaporative condenser 9, evaporative condenser 9 comprises the low-temperature level condenser 92 being positioned at side, the high-temperature level evaporimeter 91 being positioned at opposite side, low-temperature level condenser 92 is connected in low-temperature level closed circuit, and high-temperature level evaporimeter 91 is connected in high-temperature level closed circuit.
forecooler 13 is connected with in low-temperature level closed circuit, low-temperature level closed circuit through low-temperature level condenser 92, second reservoir 14, second device for drying and filtering 15, second expansion valve 16, air cooler dedicated 17, second gas-liquid separator 18 of low-temperature level compressor 11, second oil eliminator 12, forecooler 13, evaporative condenser 9, gets back to low-temperature level compressor 11 successively.Complete low-temperature level closed circuit.Before forecooler 13 is positioned at evaporative condenser 9, before being namely positioned at low-temperature level condenser 92.
high-temperature level closed circuit through high-temperature level evaporimeter 91, first gas-liquid separator 10 of high-temperature level compressor 1, first oil eliminator 2, high-temperature level condenser 3, first reservoir 5, first device for drying and filtering 6, freezing magnetic valve 7, first expansion valve 8, evaporative condenser 9, gets back to high-temperature level compressor 1 successively.Complete high-temperature level closed circuit.
overlapping refrigeration system comprises high-temperature level condensation fan 4, in the present embodiment, high-temperature level condenser 3 and forecooler 13 are respectively fin-tube heat exchanger, namely air-cooled condensing group is formed, forecooler 13 can share high-temperature level condensation fan 4 with high-temperature level condenser 3, cost-saving and space, and make more compact structure.And when high-temperature level condenser 3 be double pipe heat exchanger or plate type heat exchanger time, when being namely applied to condensing units unit, forecooler 13 also can arrange blower fan separately.
high-temperature level closed circuit can adopt the environmental protection refrigerants such as R134a or R404a.Low-temperature level closed circuit adopts the environmental protection refrigerants such as R774 or R404a.
evaporative condenser 9 can be the one in plate type heat exchanger, double pipe heat exchanger, shell and tube exchanger, can do equivalence according to the actual requirements and replace.
as mentioned above, we are illustrated according to aim of the present invention completely, but the present invention is not limited to above-described embodiment and implementation method.Different changes and enforcement is carried out in the scope that the practitioner of correlative technology field can permit at technological thought of the present invention.
Claims (7)
1.
a kind of overlapping refrigeration system, comprise high-temperature level closed circuit, low-temperature level closed circuit, by the evaporative condenser (9) that described high-temperature level closed circuit is connected with described low-temperature level closed circuit, described evaporative condenser (9) comprises the low-temperature level condenser (92) being positioned at side, be positioned at the high-temperature level evaporimeter (91) of opposite side, described low-temperature level condenser (92) is connected in described low-temperature level closed circuit, described high-temperature level evaporimeter (91) is connected in described high-temperature level closed circuit, it is characterized in that: in described low-temperature level closed circuit, be connected with forecooler (13), it is front that described forecooler (13) is positioned at described evaporative condenser (9).
2.
overlapping refrigeration system according to claim 1, is characterized in that: described low-temperature level closed circuit is connected and composed by low-temperature level compressor (11), the second oil eliminator (12), described forecooler (13), described evaporative condenser (9), the second reservoir (14), the second device for drying and filtering (15), the second expansion valve (16), air cooler dedicated (17), the second gas-liquid separator (18) head and the tail successively.
3.
overlapping refrigeration system according to claim 2, is characterized in that: described high-temperature level closed circuit is connected and composed by high-temperature level compressor (1), the first oil eliminator (2), high-temperature level condenser (3), the first reservoir (5), the first device for drying and filtering (6), freezing magnetic valve (7), the first expansion valve (8), described evaporative condenser (9), the first gas-liquid separator (10) head and the tail successively.
4.
overlapping refrigeration system according to claim 3, it is characterized in that: described overlapping refrigeration system comprises high-temperature level condensation fan (4), described high-temperature level condenser (3) and described forecooler (13) are respectively fin-tube heat exchanger, described high-temperature level condensation fan (4) to described for blowing described high-temperature level condenser (3) and described forecooler (13) simultaneously.
5.
overlapping refrigeration system according to claim 1, is characterized in that: described high-temperature level closed circuit adopts R134a or R404a environmental protection refrigerant.
6.
overlapping refrigeration system according to claim 1, is characterized in that: described low-temperature level closed circuit adopts R774 or R404a environmental protection refrigerant.
7.
overlapping refrigeration system according to claim 1, is characterized in that: described evaporative condenser (9) is plate type heat exchanger, one in double pipe heat exchanger, described shell and tube exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510021572.2A CN104567068A (en) | 2015-01-16 | 2015-01-16 | Cascade refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510021572.2A CN104567068A (en) | 2015-01-16 | 2015-01-16 | Cascade refrigeration system |
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| CN104567068A true CN104567068A (en) | 2015-04-29 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976831A (en) * | 2015-07-30 | 2015-10-14 | 武汉研润科技发展有限公司 | Evaporative condenser of cascade refrigerating machine |
| CN105066492A (en) * | 2015-08-31 | 2015-11-18 | 佛山市南海聚腾环保设备有限公司 | Heat pump brewing system |
| CN105091389A (en) * | 2015-09-11 | 2015-11-25 | 南通百源制冷设备有限公司 | Compressing and condensing unit with quickly-started low temperature section |
| CN105650922A (en) * | 2016-02-29 | 2016-06-08 | 东南大学 | Cascade refrigerating circulating system coupled with injector |
| CN107246762A (en) * | 2017-07-07 | 2017-10-13 | 河南瑞凌科技有限公司 | A kind of ex situ freeze dryer of use cascade refrigeration system |
| CN109737621A (en) * | 2018-12-05 | 2019-05-10 | 江苏白雪电器股份有限公司 | Auto-cascading refrigeration system |
| CN113531696A (en) * | 2020-04-13 | 2021-10-22 | 青岛海尔空调电子有限公司 | Air-cooled heat pump air conditioning system capable of efficiently heating |
| CN114526560A (en) * | 2020-11-23 | 2022-05-24 | 合肥安科环境试验设备有限公司 | Two-stage cascade refrigeration system of rapid temperature change test box |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01244251A (en) * | 1988-03-25 | 1989-09-28 | Sanyo Electric Co Ltd | Refrigerating plant |
| CN1627001A (en) * | 2003-12-12 | 2005-06-15 | 乐金电子(天津)电器有限公司 | Refrigeration system in ultra low temperature |
| CN204555403U (en) * | 2015-01-16 | 2015-08-12 | 江苏苏净集团有限公司 | Overlapping refrigeration system |
-
2015
- 2015-01-16 CN CN201510021572.2A patent/CN104567068A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01244251A (en) * | 1988-03-25 | 1989-09-28 | Sanyo Electric Co Ltd | Refrigerating plant |
| CN1627001A (en) * | 2003-12-12 | 2005-06-15 | 乐金电子(天津)电器有限公司 | Refrigeration system in ultra low temperature |
| CN204555403U (en) * | 2015-01-16 | 2015-08-12 | 江苏苏净集团有限公司 | Overlapping refrigeration system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976831A (en) * | 2015-07-30 | 2015-10-14 | 武汉研润科技发展有限公司 | Evaporative condenser of cascade refrigerating machine |
| CN105066492A (en) * | 2015-08-31 | 2015-11-18 | 佛山市南海聚腾环保设备有限公司 | Heat pump brewing system |
| CN105091389A (en) * | 2015-09-11 | 2015-11-25 | 南通百源制冷设备有限公司 | Compressing and condensing unit with quickly-started low temperature section |
| CN105650922A (en) * | 2016-02-29 | 2016-06-08 | 东南大学 | Cascade refrigerating circulating system coupled with injector |
| CN105650922B (en) * | 2016-02-29 | 2018-05-15 | 东南大学 | A kind of overlapping refrigerating cycle system coupled with injector |
| CN107246762A (en) * | 2017-07-07 | 2017-10-13 | 河南瑞凌科技有限公司 | A kind of ex situ freeze dryer of use cascade refrigeration system |
| CN109737621A (en) * | 2018-12-05 | 2019-05-10 | 江苏白雪电器股份有限公司 | Auto-cascading refrigeration system |
| CN109737621B (en) * | 2018-12-05 | 2021-03-19 | 江苏白雪电器股份有限公司 | Self-cascade refrigeration system |
| CN113531696A (en) * | 2020-04-13 | 2021-10-22 | 青岛海尔空调电子有限公司 | Air-cooled heat pump air conditioning system capable of efficiently heating |
| CN114526560A (en) * | 2020-11-23 | 2022-05-24 | 合肥安科环境试验设备有限公司 | Two-stage cascade refrigeration system of rapid temperature change test box |
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