CN102997567B - Pressure differential defrosting device of evaporator in air cooler of refrigerated storage - Google Patents

Pressure differential defrosting device of evaporator in air cooler of refrigerated storage Download PDF

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Publication number
CN102997567B
CN102997567B CN201210530047.XA CN201210530047A CN102997567B CN 102997567 B CN102997567 B CN 102997567B CN 201210530047 A CN201210530047 A CN 201210530047A CN 102997567 B CN102997567 B CN 102997567B
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air
cooler
electric
evaporimeter
plenum chamber
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CN102997567A (en
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杨昭
张娜
陈爱强
赵松松
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Tianjin University
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Tianjin University
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Abstract

The invention discloses a pressure differential defrosting device of an evaporator in an air cooler of a refrigerated storage. The technical scheme provided by the invention is that left and right static pressure boxes are arranged on both sides of the air cooler, the two static pressure boxes are respectively provided with pressure differential fans, and the pressure differential fans are respectively connected to the lower left and upper right air outlets through the circulating air flues. Electric heaters are respectively arranged at the lower left and upper right ends of the evaporator. Electric air valves are respectively arranged on the air outlet between the two static pressure boxes and the air cooler, the upper and lower ends of the air cooler and the air inlet and return openings of a blowing fan. According to the device, a pressure differential fan, the static pressure boxes and the electric heaters are optimized and combined, and the device is directly contacted with the surface frost layer of the evaporator to defrost through hot air, so that the defrosting time is effectively shortened. Heated air flows circularly around the evaporator in the air cooler and in the static pressure boxes to defrost, so that the defrosting energy utilization ratio is improved, and meanwhile, the defrosting warehouse temperature wave in the refrigerated storage is avoided. The plurality of diffusers and electric air valves arranged effectively solve the problem of the defrosting dead angle.

Description

The differential defroster of evaporimeter in freezer air-cooler
Technical field
The invention belongs to refrigeration and deepfreeze technology, be specifically related to a kind of to device that in freezer air-cooler, evaporimeter defrosts.
Background technology
Society people are more and more higher for the requirement of fresh fruit of vegetables quantity and quality, and freezer is the capital equipment of preserving after fruit and vegetable picking.At present, cooling device between fruit and vegetable refrigerating adopts the form of air-cooler mostly, storage is except requiring low temperature, in order to reduce by the drying loss of refrigeration agricultural byproducts, also require freezer to keep a relatively high air humidity, but the operating mode that the environment of this " low temperature and high relative humidity " by chance makes evaporimeter in freezer air-cooler be in easier frosting is moved.To make that heat exchange thermal resistance increases, Efficiency Decreasing after evaporimeter frosting, make thus that refrigeration system COP reduces, fan energy consumption increase etc.Therefore, timely and effectively evaporimeter is defrosted, extremely important for the economical operation of freezer.Defrost and mostly adopt electrically heated mode for the evaporimeter in air-cooler at present, but the method has the shortcomings such as defrosting energy consumption is large, the time is long, efficiency is low, and in defrost process, easily the temperature of setting in freezer is caused to larger fluctuation, thereby affect agricultural byproducts storage quality.If a kind of efficient, energy-conservation, evaporator defrost device efficiently can be provided, will be the required of the industry.
Summary of the invention
The object of the invention is to, provide a kind of utilize that principle of differential pressure combines with electric-heating technology to the device that in freezer air-cooler, evaporimeter defrosts, to solve in evaporator defrost process, the problem such as defrosting efficiency is low, the time is long, storehouse temperature fluctuation is large.
Referring to accompanying drawing, technical scheme of the present invention and system architecture are described.In freezer air-cooler, the differential defroster of evaporimeter has: air-cooler, plenum chamber, pressure reduction blower fan, circulation air path, electric heater, Electric air valve and drip tray, air-cooler mainly comprises: evaporimeter, breeze fan etc.Its technical scheme is: the both sides of air-cooler are respectively equipped with left plenum chamber and right plenum chamber, be respectively equipped with pressure reduction blower fan at the downside of left plenum chamber and the upside of right plenum chamber, two pressure reduction blower fans are connected to respectively the air outlet of air-cooler lower-left end and upper right side by circulation air path separately.At the lower-left of evaporimeter end and upper right side, electric heater is set respectively.Air outlet between left and right two plenum chambers and air-cooler is respectively equipped with the first and second Electric air valves; Be respectively equipped with the third and fourth Electric air valve at the air outlet of air-cooler lower-left end and upper right side; The return air inlet of breeze fan and air outlet are respectively equipped with the 5th and the 6th Electric air valve.
Air-cooler is cooling device in the storehouse that adopts, fruit and vegetable refrigerating storehouse, and air-cooler generally comprises the motor of breeze fan, evaporimeter and drive blower fan etc., and it is different from refrigeration unit, so do not comprise the equipment such as condenser, compressor.
The beneficial effect of feature of the present invention and generation is:
(1) use of combining of pressure reduction blower fan, plenum chamber and electric heater unit, directly contacts defrosting with evaporator surface frost layer by hot-air, effectively shortens defrosting time.
(2) heat that electrical heating produces is all directly used in defrosting, heat is not lost in surrounding environment, avoid in the time that defrosting finishes, needed extra cold to eliminate this part heat because cold store temperature raises, can save the energy from two aspects thus, improve defrosting energy utilization rate.
(3) air heating by electric heater only circulates in evaporimeter surrounding and plenum chamber in air-cooler, is lost in refrigerating space and the storehouse temperature fluctuation problem causing like this guarantee food storage quality by subduing when defrosting hot-air.
(4) by evaporimeter upper right side and lower left electric heater and upper right and lower-left end distribution air outlet at air-cooler are set respectively, can effectively solve defrosting Dead Core Problems.
Brief description of the drawings
Fig. 1 is operation principle of the present invention and system construction drawing.
Fig. 2 is the system architecture sketch that Fig. 1 overlooks direction.
Detailed description of the invention
Below in conjunction with accompanying drawing and by specific embodiment, structural principle of the present invention is described further.
The differential defroster of evaporimeter in freezer air-cooler, its system composition and structure are: the both sides of air-cooler 1 are respectively equipped with left plenum chamber 3 and right plenum chamber 4, be respectively equipped with 5, two pressure reduction blower fans of pressure reduction blower fan and be connected to respectively by circulation air path separately the air outlet of air-cooler lower-left end and upper right side at the downside of left plenum chamber and the upside of right plenum chamber.At the lower-left of evaporimeter 2 end and upper right side, electric heater 6 is set respectively.Air outlet between left and right two plenum chambers and air-cooler is respectively equipped with the first and second Electric air valve 7-1,7-2; Be respectively equipped with the third and fourth Electric air valve 7-3,7-4 at the air outlet of air-cooler lower-left end and upper right side; The return air inlet of breeze fan 9 and air outlet are respectively equipped with the 5th and the 6th Electric air valve 7-5,7-6.In air-cooler, the bottom of evaporimeter is provided with drip tray 8.
Under defrosting mode: first, second, third and the 4th Electric air valve open; The the 5th and the 6th Electric air valve is closed.Under non-defrosting mode: first, second, third and the 4th Electric air valve close; The the 5th and the 6th Electric air valve is opened.
The differential defroster of freezer evaporimeter is divided into two kinds of defrosting mode and non-defrosting modes according to evaporimeter frosting situation.
Operation principle and the process of the present embodiment are: when evaporator defrost, between left and right two plenum chambers and air-cooler, two Electric air valves of two Electric air valves of air outlet and air-cooler lower-left end and upper right side air outlet are opened; Breeze fan quits work, and the Electric air valve at breeze fan air outlet and return air inlet place is closed simultaneously; Two pressure reduction blower fans and two electric heaters are started working, and pressure reduction blower fan is constantly delivered to the air in plenum chamber in air-cooler by circulation air path, make plenum chamber and cold wind unit inside form certain pressure reduction by the swabbing action of pressure reduction blower fan.The air of the frost layer under the effect of pressure reduction on evaporimeter and electric heater heating produces heat convection, and hot-air directly contacts defrosting with evaporator surface frost layer.Simultaneously can be according to frosting situation, select to open a pressure reduction blower fan.When defrosting finishes, above-mentioned four Electric air valves are closed, and two pressure reduction blower fans and electric heater quit work; The the 5th and the 6th Electric air valve at the return air inlet of breeze fan and air outlet place is opened, and breeze fan is started working, and in freezer, in air and air-cooler, evaporimeter carries out heat exchange.

Claims (4)

1. the differential defroster of evaporimeter in freezer air-cooler, there is air-cooler, plenum chamber, pressure reduction blower fan, circulation air path, electric heater, Electric air valve and drip tray, air-cooler comprises: evaporimeter and breeze fan, it is characterized in that: the both sides of air-cooler (1) are respectively equipped with left plenum chamber (3) and right plenum chamber (4), be respectively equipped with pressure reduction blower fan (5) at the downside of left plenum chamber and the upside of right plenum chamber, two pressure reduction blower fans are connected to respectively the air outlet of air-cooler lower-left end and upper right side by circulation air path separately; Lower-left end and upper right side at evaporimeter (2) arrange respectively electric heater (6); Between left plenum chamber and air-cooler left side air outlet, be provided with the first Electric air valve (7-1); Between right plenum chamber and air-cooler right side air outlet, be provided with the second Electric air valve (7-2), between left plenum chamber lower end and air-cooler lower-left end air inlet, be provided with the 3rd Electric air valve (7-3); Between right plenum chamber upper end and air-cooler upper right side air inlet, be provided with the 4th Electric air valve (7-4); Be provided with the 6th Electric air valve (7-6) at the air outlet of breeze fan (9); Be provided with the 5th Electric air valve (7-5) at the return air inlet of breeze fan (9).
2. according to the differential defroster of evaporimeter in freezer air-cooler described in claim 1, it is characterized in that described the first and second Electric air valves (7-1,7-2) and the third and fourth Electric air valve (7-3,7-4) unlatching under defrosting mode; The the 5th and the 6th Electric air valve (7-5,7-6) is closed.
3. according to the differential defroster of evaporimeter in freezer air-cooler described in claim 1, it is characterized in that described the first and second Electric air valves (7-1,7-2) and the third and fourth Electric air valve (7-3,7-4) are closed under non-defrosting mode; The the 5th and the 6th Electric air valve (7-5,7-6) is opened.
4. according to the differential defroster of evaporimeter in freezer air-cooler described in claim 1, it is characterized in that the bottom of described evaporimeter (2) is provided with drip tray (8).
CN201210530047.XA 2012-12-10 2012-12-10 Pressure differential defrosting device of evaporator in air cooler of refrigerated storage Active CN102997567B (en)

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Publication number Priority date Publication date Assignee Title
CN105222478B (en) * 2014-03-19 2017-10-17 天津大学 The method defrosted using freezer outside air auxiliary electrical heater
CN105276895B (en) * 2014-07-22 2017-12-01 苏州三星电子有限公司 A kind of wind cooling refrigerator
CN104848635A (en) * 2015-02-05 2015-08-19 无锡龙舜实业有限公司 G-20 type epoxy casting agent refrigeration equipment
CN105135792A (en) * 2015-09-29 2015-12-09 天津市傲绿农副产品集团股份有限公司 Air cooler capable of realizing internal defrosting
CN106322884A (en) * 2016-08-31 2017-01-11 青岛海尔股份有限公司 Refrigerating and freezing device
CN106482435A (en) * 2016-12-05 2017-03-08 天津商业大学 A kind of natural Defrost method of cold storage refrigerating system
CN108562097A (en) * 2018-05-25 2018-09-21 合肥雪祺电气有限公司 A kind of cold-storing duct structure of the refrigerator with damper
CN112033081B (en) * 2020-08-31 2022-01-11 山东冰河制冷技术有限公司 Device for assisting electric heating defrosting by utilizing external air of refrigerator and operation method thereof

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Publication number Priority date Publication date Assignee Title
CN2608891Y (en) * 2003-04-01 2004-03-31 毕威龙 Air cooler
CN201047693Y (en) * 2007-06-02 2008-04-16 龚冬文 Microwave defrost cold air blower
KR20100085228A (en) * 2009-01-20 2010-07-29 주식회사 대우일렉트로닉스 Defrosting apparatus of refrigerator
CN101738054B (en) * 2009-12-30 2012-07-04 天津大学 Method for defrosting based on by-pass circulating defrosting structure of refrigerator
US9127875B2 (en) * 2011-02-07 2015-09-08 Electrolux Home Products, Inc. Variable power defrost heater

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