CN107816818A - A kind of folding type cooling system of freezer with hot gas defrosting - Google Patents

A kind of folding type cooling system of freezer with hot gas defrosting Download PDF

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Publication number
CN107816818A
CN107816818A CN201711220245.5A CN201711220245A CN107816818A CN 107816818 A CN107816818 A CN 107816818A CN 201711220245 A CN201711220245 A CN 201711220245A CN 107816818 A CN107816818 A CN 107816818A
Authority
CN
China
Prior art keywords
defrosting
temperature level
low
gas
evaporator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201711220245.5A
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Chinese (zh)
Inventor
宁静红
郑通
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin University of Commerce
Original Assignee
Tianjin University of Commerce
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianjin University of Commerce filed Critical Tianjin University of Commerce
Priority to CN201711220245.5A priority Critical patent/CN107816818A/en
Publication of CN107816818A publication Critical patent/CN107816818A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B7/00Compression 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/40Fluid line arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B47/00Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02Defrosting cycles
    • F25B47/022Defrosting cycles hot gas defrosting

Abstract

The present invention discloses a kind of folding type cooling system of freezer with hot gas defrosting, including high-temperature level loop and low-temperature level loop;Low-temperature level loop includes low-temperature level compressor, low-temperature level oil eliminator, two evaporators in parallel, the gas vent of low-temperature level oil eliminator forms refrigeration branch and defrosting branch road, the condensed evaporator of high-temperature high-pressure refrigerant gas of refrigeration branch, low-temperature level reservoir, choke valve, selection evaporator, a gas-liquid separator after return to low-temperature level compressor, freezed;The high-temperature high-pressure refrigerant gas of defrosting branch road enters another evaporator defrosting after pressure-regulating valve pressure regulation, and the refrigerant liquid after defrosting returns to gas-liquid separator.The present invention uses two parallel evaporators, solves the problems, such as during defrosting storehouse temperature fluctuation may be caused excessive.

Description

A kind of folding type cooling system of freezer with hot gas defrosting
Technical field
The present invention relates to refrigeration system technical field, and in particular to a kind of cascade refrigeration system of freezer with hot gas defrosting System.
Background technology
Hot gas defrosting mode is used in low-temperature cold store, the defrosting time is short, with Ku Nei and the heat exchange amount of surrounding building enclosure It is few, it is not necessary to expend the electric energy of cooling water circulation water pump or condenser fan.Its defrosting efficiency is higher, is a kind of removing for energy-conservation White mode.For existing refrigeration system during hot gas defrosting, whole system is in stopped status, can fluctuate storehouse temperature It is bigger, it is unfavorable for food storage;Compressor air-discharging is led directly in evaporator simultaneously, easily right because pressure differential is bigger Evaporator coil has larger percussion, and control is improper, and Decrepitation Phenomena easily occurs;Refrigerant liquid caused by last defrosting Pressure-regulating valve must be utilized to reduce the pressure of liquid reservoir in system so that liquid can be back in system, can cause to press The power consumption increase of contracting machine.
The content of the invention
The purpose of the present invention is for technological deficiency present in prior art, there is provided one kind can continuous cooling with it is continuous The freezer folding type cooling system of defrosting, to solve the problems, such as that evaporator defrosting is with keeping storehouse temperature stable in freezer.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of folding type cooling system of freezer with hot gas defrosting, including high-temperature level loop and low-temperature level loop;High temperature Level loop include being set in sequence in successively high-temperature level oil eliminator on gas outlet to the loop of gas returning port of high-temperature level compressor, Condenser, high-temperature level reservoir, choke valve, condenser/evaporator;The low-temperature level loop includes low-temperature level compressor and low-temperature level Low-temperature level oil eliminator, two evaporators in parallel of compressor connection, the gas vent of the low-temperature level oil eliminator are formed Refrigeration branch and defrosting branch road, the condensed evaporator of high-temperature high-pressure refrigerant gas of refrigeration branch, low-temperature level reservoir, throttling Low-temperature level compressor is returned to after valve, evaporator, a gas-liquid separator selecting, is freezed;The HTHP of defrosting branch road Refrigerant gas can enter another evaporator defrosting after pressure-regulating valve pressure regulation, and the refrigerant liquid after defrosting returns to the gas The low-temperature level compressor is returned to after liquid/gas separator separation.
Two evaporators in parallel connect a defrosting magnetic valve respectively, after two defrosting magnetic valve parallel connections with defrosting Branch road connects;Two evaporators in parallel connect a refrigeration magnetic valve respectively, after two refrigeration magnetic valve parallel connections with system Cold branch road connection.
Defrosting branch road between the pressure-regulating valve and two defrosting magnetic valves is provided with pressure sensor, to survey in real time Measure the refrigerant gas pressure on defrosting branch road.
Compared with prior art, the beneficial effects of the invention are as follows:
1. the present invention can realize an evaporator refrigeration, another evaporator defrosts, and can by magnetic valve opening and closing The exchange at any time of both effects is realized, has the function that continuous cooling maintains storehouse temperature stable;
2. the present invention using the high-temperature high-pressure refrigerant gas of pressure-regulating valve regulation low-temperature level compressor discharge, prevent because The excessive evaporator to carrying out defrosting of pressure causes to damage.
3. the present invention directly passes back into refrigerant liquid caused by defrosting in gas-liquid separator, on the one hand no longer need to lead to Crossing the artificial reservoir pressure that reduces makes refrigerant flow back, and causes to press the increase of low-temperature level contracting machine power consumption;During another aspect defrosting Unnecessary refrigerant gas can circularly cooling again by gas-liquid separator.
Brief description of the drawings
Fig. 1 show folding type cooling system structural representation of the freezer of the present invention with hot gas defrosting.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in figure 1, a kind of folding type cooling system of freezer with hot gas defrosting, including:
High-temperature level loop and low-temperature level loop;High-temperature level loop includes being set in sequence in going out for high-temperature level compressor 1 successively High-temperature level oil eliminator 2, condenser 3, high-temperature level reservoir 4, choke valve 5, condensation evaporation on gas port to the loop of gas returning port Device 6;The low-temperature level oil eliminator 8, two that the low-temperature level loop includes low-temperature level compressor 7, is connected with low-temperature level compressor First evaporator 16 and the second evaporator 17 in parallel, the gas vent of the low-temperature level oil eliminator form refrigeration branch and melted White branch road, the condensed evaporator 6 of high-temperature high-pressure refrigerant gas, low-temperature level reservoir 9, the choke valve 10, first of refrigeration branch Low-temperature level compressor 7 is returned to after a selected evaporator, gas-liquid separator 18 in the evaporator 17 of evaporator 16 and second, is carried out Refrigeration;The high-temperature high-pressure refrigerant gas of defrosting branch road can enter the first evaporator 16 and second after the pressure regulation of pressure-regulating valve 11 Another evaporator defrosting in evaporator 17, the refrigerant liquid after defrosting return to institute after returning to the gas-liquid separator separates State low-temperature level compressor.
Wherein, the high-temperature level loop is passed through successively from the high temperature and high pressure gas that high temperature stage compressor outlet is discharged by pipeline Cross high-temperature level oil eliminator, high-temperature level condenser, reservoir, choke valve, return to high-temperature level compressor after condenser/evaporator and return Gas port.
Specifically, two evaporators in parallel connect a defrosting magnetic valve respectively, it is first as shown in figure institute 1 The defrosting magnetic valve 15 of defrosting magnetic valve 13 and second, it is connected after two defrosting magnetic valve parallel connections with defrosting branch road;Described in two simultaneously The evaporator of connection connects a refrigeration magnetic valve respectively, as shown in figure institute 1, for the first refrigeration refrigeration electromagnetism of magnetic valve 12 and second Valve 14, it is connected after two refrigeration magnetic valve parallel connections with refrigeration branch.
When opening the first refrigeration defrosting magnetic valve 15 of magnetic valve 12 and second, the first defrosting magnetic valve 13 and the second system are closed During cold magnetic valve 14, the first evaporator 16 is in refrigerating state, and the second evaporator 17 is in defrosting state.
Detailed process is that the high temperature and high pressure gas of low temperature stage compressor outlet discharge are divided into two branch by oil eliminator Road, condenser/evaporator of the part of refrigerant gas through refrigeration branch, low-temperature level reservoir, choke valve, the first evaporator 16, gas Liquid/gas separator 18 eventually passes back to low-temperature level compressor and completes whole process of refrigerastion;Another part refrigerant gas from bypass pipe (i.e. Defrosting branch road) pressure that can be born to the second evaporator 17 through pressure-regulating valve regulation of outflow flows into the second evaporator 17 and carries out Defrosting process, the refrigerant liquid after last defrosting are flowed back together with unnecessary refrigerant gas in gas-liquid separator, now Second defrosting magnetic valve 15 is closed, and completes defrosting process.
First evaporator 16 is roughly the same with the defrosting process of the second evaporator 17, it is only necessary to by the first defrosting magnetic valve 13 Opened with the second refrigeration magnetic valve 14, close the first refrigeration magnetic valve 12 and second defrosting magnetic valve 15 and the first evaporation can be achieved The exchange roles of the evaporator 17 of device 16 and second, another evaporator defrosting during realizing an evaporator refrigeration, without Refrigeration is influenceed during defrosting, influences defrosting in refrigeration.
Wherein, the refrigerant gas pressure flowed into during defrosting in an evaporator in two evaporators is by pressure Sensor measures.
In addition, the folding type cooling system of the present invention, which may also be multiple evaporators in parallel, reaches continuous cooling and continuous defrosting Effect.
Described above is only the preferred embodiment of the present invention, it is noted that for the common skill of the art For art personnel, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications Also it should be regarded as protection scope of the present invention.

Claims (3)

1. a kind of folding type cooling system of freezer with hot gas defrosting, including high-temperature level loop and low-temperature level loop;High-temperature level Loop includes being set in sequence in high-temperature level oil eliminator on gas outlet to the loop of gas returning port of high-temperature level compressor, cold successively Condenser, high-temperature level reservoir, choke valve, condenser/evaporator;Characterized in that, the low-temperature level loop is compressed including low-temperature level Machine, the low-temperature level oil eliminator being connected with low-temperature level compressor, two evaporators in parallel;The gas of the low-temperature level oil eliminator Body exports to form refrigeration branch and defrosting branch road, the condensed evaporator of high-temperature high-pressure refrigerant gas of refrigeration branch, low-temperature level Reservoir, choke valve, selection evaporator, a gas-liquid separator after return to low-temperature level compressor, freezed;Defrosting branch road High-temperature high-pressure refrigerant gas can enter another evaporator defrosting, the refrigerant liquid after defrosting after pressure-regulating valve pressure regulation Body returns to the low-temperature level compressor after returning to the gas-liquid separator separates.
2. folding type cooling system of the freezer with hot gas defrosting according to claim 1, it is characterised in that described in two simultaneously The evaporator of connection connects a defrosting magnetic valve respectively, is connected after two defrosting magnetic valve parallel connections with defrosting branch road;Described in two Evaporator in parallel connects a refrigeration magnetic valve respectively, is connected after two refrigeration magnetic valve parallel connections with refrigeration branch.
3. folding type cooling system of the freezer with hot gas defrosting according to claim 2, it is characterised in that the pressure is adjusted Defrosting branch road between section valve and two defrosting magnetic valves is provided with pressure sensor, to measure the refrigeration on defrosting branch road in real time Agent gas pressure.
CN201711220245.5A 2017-11-29 2017-11-29 A kind of folding type cooling system of freezer with hot gas defrosting Pending CN107816818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711220245.5A CN107816818A (en) 2017-11-29 2017-11-29 A kind of folding type cooling system of freezer with hot gas defrosting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711220245.5A CN107816818A (en) 2017-11-29 2017-11-29 A kind of folding type cooling system of freezer with hot gas defrosting

Publications (1)

Publication Number Publication Date
CN107816818A true CN107816818A (en) 2018-03-20

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112033080A (en) * 2020-08-31 2020-12-04 山东冰河制冷技术有限公司 Refrigeration house refrigeration system and refrigeration control method
EP3786547A1 (en) * 2019-08-30 2021-03-03 SAB Engineers GmbH Cold storage system and associated method
CN114659377A (en) * 2022-05-26 2022-06-24 苏州奥德高端装备股份有限公司 Gas condensation recovery system and control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101307973A (en) * 2008-07-09 2008-11-19 韩勋服 Refrigerating device multi- circulating defrosting method and device
CN201964693U (en) * 2011-01-07 2011-09-07 吴家伟 Evaporator capable of simultaneously realizing refrigeration and hot working medium defrosting
CN103940156A (en) * 2014-05-04 2014-07-23 江苏苏净集团有限公司 Cascade heat pump drying system and control method thereof
CN207600009U (en) * 2017-11-29 2018-07-10 天津商业大学 A kind of folding type cooling system of freezer with hot gas defrosting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101307973A (en) * 2008-07-09 2008-11-19 韩勋服 Refrigerating device multi- circulating defrosting method and device
CN201964693U (en) * 2011-01-07 2011-09-07 吴家伟 Evaporator capable of simultaneously realizing refrigeration and hot working medium defrosting
CN103940156A (en) * 2014-05-04 2014-07-23 江苏苏净集团有限公司 Cascade heat pump drying system and control method thereof
CN207600009U (en) * 2017-11-29 2018-07-10 天津商业大学 A kind of folding type cooling system of freezer with hot gas defrosting

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3786547A1 (en) * 2019-08-30 2021-03-03 SAB Engineers GmbH Cold storage system and associated method
CN112033080A (en) * 2020-08-31 2020-12-04 山东冰河制冷技术有限公司 Refrigeration house refrigeration system and refrigeration control method
CN114659377A (en) * 2022-05-26 2022-06-24 苏州奥德高端装备股份有限公司 Gas condensation recovery system and control method

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Application publication date: 20180320