CN203501525U - Commercial carbon dioxide cascade refrigeration system - Google Patents
Commercial carbon dioxide cascade refrigeration system Download PDFInfo
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- CN203501525U CN203501525U CN201320642897.9U CN201320642897U CN203501525U CN 203501525 U CN203501525 U CN 203501525U CN 201320642897 U CN201320642897 U CN 201320642897U CN 203501525 U CN203501525 U CN 203501525U
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Abstract
The utility model discloses a commercial carbon dioxide cascade refrigeration system. The commercial carbon dioxide cascade refrigeration system is characterized in that a cascade refrigeration circuit is composed of a high-temperature-level circuit and a low-temperature-level circuit, multiple refrigeration compressors which are connected in parallel are arranged in the high-temperature-level circuit, multiple refrigeration compressors which are connected in parallel are arranged in the low-temperature-level circuit, environment-friendly R404A refrigerating fluid, environment-friendly R134a refrigerating fluid, and environment-friendly R717 refrigerating fluid or environment-friendly R410A refrigerating fluid are adopted in the high-temperature-level circuit, and a natural working medium R744 is used in the low-temperature-level circuit. The commercial carbon dioxide cascade refrigeration system is safe, reliable, good in energy-saving performance, convenient and fast to control, and capable of providing a cold source for cold storage, refrigeration and fast refrigeration of food production, storage, transportation and marketing enterprises.
Description
Technical field
The utility model relates to refrigeration system, and particularly a kind of carbon dioxide that adopts is as the commercial cascade refrigeration unit of low temperature level refrigeration working medium.
Background technology
Commercial cascade refrigeration unit is widely used in production, processing, storing and the sales section of agricultural byproducts, fresh-keeping at food preserving, avoid or reduce food in intermediate links loss, guarantee that there is important effect the aspects such as food security.Modern Supermarket all has refrigeration, freezer and the large-area refrigeration of large volume, freezing displaying sales territory, large, medium and small type loglstics enterprise all has thousands of tons of to refrigeration, the freezer of few hundred thousand tonnes of, and refrigeration, freezing job shop and storage vault are all had in modern food processing enterprise.Along with the fast development of China's economic and the propelling of urbanization, the rapid growth of the demand of commercial cascade refrigeration unit.At present, the relative USA and Europe of the manufacture level of China's commercial refrigeration unit Deng developed country is relatively backward, is mainly reflected in the aspects such as energy-conservation, environmental protection and reliability; Using in recent years ammonia refrigerant that fatal crass's major accident occurs appears in the newspapers repeatly, food production manufacturing enterprise, the commercial refrigerating device of the circulation enterprise such as market, supermarket active service, most poor freon class cold-producing mediums of environmental-protecting performance that adopt, the shortcoming that refrigerant charge is large, refrigeration unit efficiency is low is very outstanding.
CO
2nontoxic, do not fire, there is good economy, security and chemical stability, be a kind of environmentally friendly natural refrigerating working medium.Compare CO with freon class cold-producing medium
2evaporation latent heat and refrigerating effect per unit swept volume large, kinematic viscosity is low, flow losses are little, thermal conductivity factor is high, the coefficient of heat transfer is large, the ratio of fluid density and vapour density is little, after throttling, between each loop, the distribution ratio of cold-producing medium is more even; CO
2there is significant energy-conserving and environment-protective advantage.CO
231.1 ℃ of critical-temperatures, critical pressure 7.3MPa, be gaseous state under normal temperature, even its saturation pressure is also up to 6.5MPa when 25 ℃ of normal temperature, therefore, with CO
2as refrigeration working medium, in the functional reliability of system and security, must there is corresponding safeguard measure.
Summary of the invention
The utility model is for avoiding above-mentioned existing existing weak point, a kind of energy-conserving and environment-protective, carbon dioxide superposition type commercial refrigeration unit safe and reliable to operation are provided, for take the superposition type commercial refrigeration unit that carbon dioxide is working medium, applying of commercial kitchen area, provide technical guarantee.
The utility model is that technical solution problem adopts following technical scheme:
The design feature of the utility model carbon dioxide superposition type business-use refrigrating system is:
High temperature level loop is set is: each high temperature level refrigeration compressor is connected in parallel, the exhaust main of described each high temperature level refrigeration compressor connects the first oil eliminator, the lubricating oil outlet petroleum pipeline of described the first oil eliminator is connected to the crankcase of high temperature level refrigeration compressor, the refrigerant gas outlet of the first oil eliminator is connected to the entrance of the first air-cooled condenser, the refrigerant liquid outlet of described the first air-cooled condenser is connected to the entrance of high temperature level reservoir, the outlet of described high temperature level reservoir is divided into two-way output, wherein Yi road is output as refrigeration user low-temperature receiver is provided, the output of another road is successively through the evaporation ends entrance of magnetic valve and expansion valve access evaporative condenser, the refrigerant gas of being exported by described evaporative condenser accesses the first discharge jointly with the refrigerant gas that returns from refrigeration user, and returns to high temperature level refrigeration compressor by described the first discharge,
Low temperature level loop is set is: each low temperature level refrigeration compressor is connected in parallel, the exhaust main of described each low temperature level refrigeration compressor connects the second oil eliminator, the lubricating oil outlet petroleum pipeline of described the second oil eliminator is connected to the crankcase of low temperature level refrigeration compressor, the refrigerant gas outlet of the second oil eliminator is connected to aerial cooler, the gaseous refrigerant of exporting in described aerial cooler enters the condensation end entrance of evaporative condenser, the liquid refrigerant access low temperature level high-pressure reservoir of the condensation end outlet output of described evaporative condenser, described low temperature level reservoir outlet is connected to the colling end entrance of regenerator, crossing cold low-temperature refrigerant flows out in the colling end outlet of described regenerator, for freezing user provides freezing low-temperature receiver, the refrigerant gas that in described regenerator, heat absorption heats up returns to low temperature level refrigeration compressor through the second discharge,
Described high temperature level is used R404A, R134a, R717 or R410A cold-producing medium;
Described low temperature level is used R744 carbon dioxide coolant.
The design feature of the utility model carbon dioxide superposition type business-use refrigrating system is also:
Emergent low-temperature receiver is set is: the gas outlet at refrigeration compressor connects the second air-cooled condenser, capillary and evaporation coil successively, and forms refrigerant circulation loop with the air entry of the output termination refrigeration compressor of evaporation coil; Described evaporation coil is arranged in described low temperature level high-pressure reservoir; Described emergent low-temperature receiver adopts R134a cold-producing medium.
Described evaporative condenser and regenerator are plate type heat exchanger or are shell and tube exchanger.
Compared with the prior art, the utility model beneficial effect is embodied in:
1, the utility model CO
2the high temperature level of superposition type commercial refrigeration unit and low temperature level are used respectively many refrigeration compressor parallel connections, can regulate according to the variation of user's thermic load operation number of units and the operating frequency of refrigeration compressor, controlling the refrigeratory capacity of refrigeration unit and the thermic load of application matches, realize the energy-saving run of refrigeration unit and the accurate control of controlled device temperature, have advantages of that Load Regulation is convenient, good energy saving property, accuracy of temperature control are high, easily be automated.
2, the utility model CO
2superposition type commercial refrigeration unit is by arranging high temperature oil conservator and the low temperature level reservoir of larger volume, and the frequent fluctuation of load-adaptable and the wide cut of ambient temperature change, for user provides refrigeration, the low-temperature receiver that freezing and quick-frozen is required;
3, the utility model, after the oil content of low temperature stage compressor, is provided with CO
2aerial cooler, conventionally can reduce high temperature level thermic load 10% left and right, reduce unit volume and energy consumption, there is energy-conservation, material-saving effect significantly.
4, the utility model is that low temperature level reservoir has configured emergent low-temperature receiver, and under the unconventional conditions such as power failure, hostdown, emergent low-temperature receiver starts operation automatically, controls CO
2pressure in refrigerating circuit, in safe range, improves the safety and reliability of refrigeration unit; Also significantly improved the quick startability of unit simultaneously;
5, commercial refrigeration unit has the feature of uninterrupted operation conventionally, and the utility model, in response to the guarantee in chilling source, has been exempted superposition type low temperature unit and in low temperature level, configured necessity of large capacity expansion vessel.
Accompanying drawing explanation
Fig. 1 is the utility model system architecture schematic diagram;
Number in the figure: 11 high temperature level refrigeration compressors, 12 first oil eliminators, 13 first air-cooled condensers, 14 high temperature level reservoirs, 15 magnetic valves, 16 expansion valves, 17 evaporative condensers, 18 first discharges, 21 low temperature level refrigeration compressors, 22 second oil eliminators, 23 aerial coolers, 24 low temperature level reservoirs, 25 regenerators, 26 second discharges, 31 refrigeration compressors, 32 second air-cooled condensers, 33 capillaries, 34 evaporation coils.
The specific embodiment
Referring to Fig. 1, in the present embodiment, the version of carbon dioxide superposition type business-use refrigrating system is:
High temperature level loop is set is: each high temperature level refrigeration compressor 11 is connected in parallel, the exhaust main of each high temperature level refrigeration compressor 11 connects the first oil eliminator 12, the lubricating oil outlet petroleum pipeline of the first oil eliminator 12 is connected to the crankcase of high temperature level refrigeration compressor 11, the refrigerant gas outlet of the first oil eliminator 12 is connected to the entrance of the first air-cooled condenser 13, the refrigerant liquid outlet of the first air-cooled condenser 13 is connected to the entrance of high temperature level reservoir 14, the outlet of high temperature level reservoir 14 is divided into two-way output, wherein Yi road output A end provides low-temperature receiver for refrigerating user, the output of another road is successively through the evaporation ends entrance of magnetic valve 15 and expansion valve 16 access evaporative condensers 17, and the condensation heat that absorbs low temperature level cold-producing medium in evaporative condenser 17 completes evaporation, the refrigerant gas of being exported by evaporative condenser 17 returns to the common access of refrigerant gas the first discharge 18 with the B end from refrigeration user, and returns to high temperature level refrigeration compressor 11 by the first discharge 18,
Low temperature level loop is set is: each low temperature level refrigeration compressor 21 is connected in parallel, the exhaust main of each low temperature level refrigeration compressor 21 connects the second oil eliminator 22, the lubricating oil outlet petroleum pipeline of the second oil eliminator 22 is connected to the crankcase of low temperature level refrigeration compressor 21, the refrigerant gas outlet of the second oil eliminator 22 is connected to aerial cooler 23, in aerial cooler 23, the gaseous refrigerant of output enters the condensation end entrance of evaporative condenser 17, the liquid refrigerant access low temperature level high-pressure reservoir 24 of the condensation end outlet output of evaporative condenser 17, 24 outlets of low temperature level reservoir are connected to the colling end entrance of regenerator 25, crossing cold low-temperature refrigerant flows out in the colling end C of regenerator 25 outlet, for freezing user provides freezing low-temperature receiver, the refrigerant gas that in regenerator 25, heat absorption heats up returns to low temperature level refrigeration compressor 21 through the second discharge 26.After the oil content of low temperature level refrigeration compressor, CO is set
2 aerial cooler 23, its heat release can equivalent reduces the design refrigerating capacity of high temperature level, and energy-saving effect is obvious.
High temperature level is used R404A, R134a, R717 or R410A cold-producing medium; Low temperature level is used R744 carbon dioxide coolant.
In the present embodiment, as shown in Figure 1, being provided with emergent low-temperature receiver is: in the gas outlet of refrigeration compressor 31, connect successively the second air-cooled condenser 32, capillary 33 and evaporation coil 34, and form refrigerant circulation loop with the air entry of the output termination refrigeration compressor 31 of evaporation coil 34; Evaporation coil 34 is arranged in low temperature level high-pressure reservoir 24; Emergent low-temperature receiver adopts R134a cold-producing medium.In concrete enforcement, emergent low-temperature receiver can be used the emergency power sources of self-preparing (as fuel electric generator), external power supply or battery etc., to tackle the situation of power failure.Under the unconventional conditions such as power failure, hostdown, emergent low-temperature receiver starts operation, controls CO
2pressure in reservoir and closed circuit thereof, in safe range, is guaranteed refrigeration unit and relevant device safety, simultaneously for the condition that provides is provided refrigeration unit fast.
In addition, the first air-cooled condenser 13 can be set to cocurrent flow type condenser, evaporative condenser etc.; In grease channel between the first oil eliminator 12 and the second oil eliminator 22 and refrigeration compressor, can increase oil conservator is set; Can also to system architecture, simplify or equivalence replacement according to the actual motion temperature range of commercial refrigeration unit.
Claims (3)
1. a carbon dioxide superposition type business-use refrigrating system, is characterized in that:
High temperature level loop is set is: each high temperature level refrigeration compressor (11) is connected in parallel, the exhaust main of described each high temperature level refrigeration compressor (11) connects the first oil eliminator (12), the lubricating oil outlet petroleum pipeline of described the first oil eliminator (12) is connected to the crankcase of high temperature level refrigeration compressor (11), the refrigerant gas outlet of the first oil eliminator (12) is connected to the entrance of the first air-cooled condenser (13), the refrigerant liquid outlet of described the first air-cooled condenser (13) is connected to the entrance of high temperature level reservoir (14), the outlet of described high temperature level reservoir (14) is divided into two-way output, wherein Yi road is output as refrigeration user low-temperature receiver is provided, the output of another road accesses the evaporation ends entrance of evaporative condenser (17) successively through magnetic valve (15) and expansion valve (16), refrigerant gas by described evaporative condenser (17) output accesses the first discharge (18) jointly with the refrigerant gas that returns from refrigeration user, and returns to high temperature level refrigeration compressor (11) by described the first discharge (18),
Low temperature level loop is set is: each low temperature level refrigeration compressor (21) is connected in parallel, the exhaust main of described each low temperature level refrigeration compressor (21) connects the second oil eliminator (22), the lubricating oil outlet petroleum pipeline of described the second oil eliminator (22) is connected to the crankcase of low temperature level refrigeration compressor (21), the refrigerant gas outlet of the second oil eliminator (22) is connected to aerial cooler (23), in described aerial cooler (23), the gaseous refrigerant of output enters the condensation end entrance of evaporative condenser (17), the liquid refrigerant access low temperature level high-pressure reservoir (24) of the condensation end outlet output of described evaporative condenser (17), described low temperature level reservoir (24) outlet is connected to regenerator (25) colling end entrance, crossing cold low-temperature refrigerant flows out in the outlet of described regenerator (25) colling end, for freezing user provides freezing low-temperature receiver, the refrigerant gas that in described regenerator (25), heat absorption heats up returns to low temperature level refrigeration compressor (21) through the second discharge (26),
Described high temperature level is used R404A, R134a, R717 or R410A cold-producing medium; Described low temperature level is used R744 carbon dioxide coolant.
2. carbon dioxide superposition type business-use refrigrating system according to claim 1, it is characterized in that: emergent low-temperature receiver is set is: in the gas outlet of refrigeration compressor (31), connect successively the second air-cooled condenser (32), capillary (33) and evaporation coil (34), and with the air entry formation refrigerant circulation loop of the output termination refrigeration compressor (31) of evaporation coil (34); Described evaporation coil (34) is arranged in described low temperature level high-pressure reservoir (24); Described emergent low-temperature receiver adopts R134a cold-producing medium.
3. carbon dioxide superposition type business-use refrigrating system according to claim 1 and 2, is characterized in that: described evaporative condenser (17) and regenerator (25) are plate type heat exchanger or are shell and tube exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320642897.9U CN203501525U (en) | 2013-10-18 | 2013-10-18 | Commercial carbon dioxide cascade refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320642897.9U CN203501525U (en) | 2013-10-18 | 2013-10-18 | Commercial carbon dioxide cascade refrigeration system |
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| CN203501525U true CN203501525U (en) | 2014-03-26 |
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| CN201320642897.9U Withdrawn - After Issue CN203501525U (en) | 2013-10-18 | 2013-10-18 | Commercial carbon dioxide cascade refrigeration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486755A (en) * | 2013-10-18 | 2014-01-01 | 安徽美乐柯制冷空调设备有限公司 | Carbon dioxide overlapping-type commercial refrigeration system |
-
2013
- 2013-10-18 CN CN201320642897.9U patent/CN203501525U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486755A (en) * | 2013-10-18 | 2014-01-01 | 安徽美乐柯制冷空调设备有限公司 | Carbon dioxide overlapping-type commercial refrigeration system |
| CN103486755B (en) * | 2013-10-18 | 2016-02-24 | 安徽美乐柯制冷空调设备有限公司 | A kind of carbon dioxide overlapping-type commercial refrigeration system |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140326 Effective date of abandoning: 20160224 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140326 Effective date of abandoning: 20160224 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |