CN105241107A - CO2 cascade refrigeration system without dedicated defrosting compressor - Google Patents
CO2 cascade refrigeration system without dedicated defrosting compressor Download PDFInfo
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- CN105241107A CN105241107A CN201510741535.9A CN201510741535A CN105241107A CN 105241107 A CN105241107 A CN 105241107A CN 201510741535 A CN201510741535 A CN 201510741535A CN 105241107 A CN105241107 A CN 105241107A
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- mouth
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- defrosting
- compressor
- evaporimeter
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Abstract
The invention belongs to a CO2 cascade refrigeration system without a dedicated defrosting compressor, and solves the problems existing in the background art that defrosting return liquid is drained in a CO2 low-pressure circulating cylinder, so that a system is not energy-saving, and since a dedicated defrosting compressor is arranged, the cost is increased. The key points of the technical scheme are that the outlet of a CO2 compressor passes through a first hot gas valve, a first evaporator, a first defrosting liquid return valve, a defrosting pressure regulating valve, a Q port or an M port or an N port of a CO2 liquid storage device, and an E port or an F port of a condensing evaporator through pipelines sequentially. The invention is suitable for a CO2 refrigeration system.
Description
Technical field: the invention belongs to Refrigeration Technique, specifically a kind of CO not with special defrosting compressor
2cascade refrigeration system.
Background technology: existing CO
2the hot gas defrosting of cascade refrigeration system, CO
2liquid is returned in high-pressure hot gas condensed defrosting of absorbing heat in evaporimeter, enters CO
2low pressure recycle cylinder, the flash gas produced after highly pressurized liquid throttling and uncooled gases at high pressure, finally by CO
2compressor sucks, and have impact on normal kind of refrigeration cycle, causes the not energy-conservation of system.With the CO of special defrosting compressor
2cascade refrigeration system, is suitable for the system that evaporimeter needs frequently to carry out hot gas defrosting, if evaporimeter does not need frequently to carry out hot gas defrosting, if special defrosting compressor can increase cost.
Summary of the invention: object of the present invention is exactly propose a kind of CO not with special defrosting compressor
2cascade refrigeration system, exists to solve background technology: defrosting is returned liquid and entered CO
2low pressure recycle cylinder, causes the not energy-conservation of system, if special defrosting compressor can increase the problem of cost.Solving this technical problem adopted technical scheme is: the first scheme: a kind of CO not with special defrosting compressor
2cascade refrigeration system, wherein CO
2cascade system is: high-temperature level compressor outlet returns to high-temperature level suction port of compressor through high-temperature level condenser, high-temperature level liquid reservoir, high-temperature level choke valve and condenser/evaporator H mouth and G mouth successively by pipeline; CO
2compressor outlet passes through pipeline successively through bleed pressure regulator, condenser/evaporator E mouth or F mouth and L mouth, CO
2liquid reservoir M mouth or Q mouth and Y mouth, CO
2choke valve, CO
2low pressure recycle cylinder A mouth or C mouth and B mouth, CO
2pump, supplying valve second, evaporimeter second, return-air valve second, CO
2low pressure recycle cylinder A mouth or C mouth and D mouth return CO2 compressor entrance; It is characterized in that hot gas defrosting is: CO
2compressor outlet returns liquid valve first, defrosting pressure-regulating valve, CO through first, the defrosting of hot-blast valve first, evaporimeter successively by pipeline
2liquid reservoir Q mouth or M mouth and N mouth, condenser/evaporator E mouth or F mouth.
First scheme: a kind of CO not with special defrosting compressor
2cascade refrigeration system, wherein CO
2cascade system is: high-temperature level compressor outlet returns to high-temperature level suction port of compressor through high-temperature level condenser, high-temperature level liquid reservoir, high-temperature level choke valve and condenser/evaporator H mouth and G mouth successively by pipeline; CO
2compressor outlet passes through pipeline successively through bleed pressure regulator, condenser/evaporator E mouth or F mouth and L mouth, CO
2liquid reservoir M mouth and Y mouth, CO
2choke valve, CO
2low pressure recycle cylinder A mouth or C mouth and B mouth, CO
2pump, supplying valve second, evaporimeter second, return-air valve second, CO
2low pressure recycle cylinder A mouth or C mouth and D mouth return CO2 compressor entrance; It is characterized in that hot gas defrosting is: CO
2compressor outlet returns liquid valve first, defrosting pressure-regulating valve, condenser/evaporator E mouth or F mouth through first, the defrosting of hot-blast valve first, evaporimeter successively by pipeline.
In above two schemes, when evaporimeter second and hot-blast valve second and defrosting return that liquid valve second is communicated with and supplying valve second and return-air valve second are closed, evaporimeter first is communicated with supplying valve first return-air valve first and hot-blast valve first and defrosting return liquid valve first when closing, then realize the exchange roles of evaporimeter first evaporimeter second.The quantity of evaporimeter second can be 1, also can be multiple stage; The quantity of evaporimeter first can be 1, also can be multiple stage.Wherein, CO
2the A mouth of low pressure recycle cylinder and C mouth are positioned at the gas phase zone of inlet end, CO
2the D mouth of low pressure recycle cylinder is positioned at the gas phase zone of outlet side, CO
2the B mouth of low pressure recycle cylinder is positioned at liquid phase region.The E mouth of condenser/evaporator and F mouth and K mouth are positioned at CO
2the gas phase zone of working medium side, the L mouth of condenser/evaporator is positioned at the outlet end of CO2 working medium side, and the H mouth of condenser/evaporator is the entrance of high-temperature level working medium, and the G mouth of condenser/evaporator is the outlet of high-temperature level working medium.CO
2the M mouth of liquid reservoir and Q mouth and N mouth are positioned at gas phase zone, CO
2the Y mouth of liquid reservoir is positioned at liquid phase region.
The beneficial effect that the present invention is had compared with the prior art is: adopt technique scheme, on the one hand, when there being evaporimeter to need defrosting, bleed pressure regulator regulates the pressure at expulsion of CO2 compressor outlet, part high-pressure hot gas enters without bleed pressure regulator and needs the evaporimeter of defrosting to carry out defrosting, and a part of high-pressure hot gas enters condenser/evaporator through bleed pressure regulator and participates in kind of refrigeration cycle.By the ability of adjustment high-temperature level compressor, Indirect method CO
2the inspiratory capacity of compressor, can realize an evaporator refrigeration, the effect of another evaporimeter defrosting.On the other hand, defrosting is returned liquid and is entered CO
2liquid reservoir or condenser/evaporator but not CO
2low pressure recycle cylinder, CO
2in liquid reservoir and condenser/evaporator, pressure will much larger than CO
2pressure in low pressure recycle cylinder, the Pressure Drop that liquid is returned in defrosting reduces, the flash gas produced after throttling and the uncooled high pressure gas scale of construction all reduce, the most important thing is that these gases are finally be condensed into liquid by high-temperature level compressor, condensation under higher condenser/evaporator pressure, the economy of system is greatly improved.Again on the one hand, by adjusting the selection of valve, the exchange of evaporimeter second and the defrosting of evaporimeter first, refrigeration can be realized.
Accompanying drawing illustrates: Fig. 1 is the schematic diagram of the first scheme of the present invention.Fig. 2 is the schematic diagram of first scheme of the present invention
Detailed description of the invention:
Embodiment 1: with reference to figure 1, a kind of CO not with special defrosting compressor
2cascade refrigeration system, wherein CO
2cascade system is: high-temperature level compressor 2 exports and returns high-temperature level compressor 2 entrance through high-temperature level condenser 1, high-temperature level liquid reservoir 5, high-temperature level choke valve 22 and condenser/evaporator 21H mouth and G mouth successively by pipeline; CO2 compressor 3 exports by pipeline successively through bleed pressure regulator 4, condenser/evaporator 21E mouth or F mouth and L mouth, CO
2liquid reservoir 18M mouth or Q mouth and Y mouth, CO
2choke valve 19, CO
2low pressure recycle cylinder 20A mouth or C mouth and B mouth, CO
2pump 17, supplying valve second 15, evaporimeter second 16, return-air valve second 12, CO
2low pressure recycle cylinder 20A mouth or C mouth and D mouth return CO2 compressor 3 entrance; It is characterized in that hot gas defrosting is: CO2 compressor 3 exports and returns liquid valve first 9, defrosting pressure-regulating valve 6, CO through hot-blast valve first 8, evaporimeter first 11, defrosting successively by pipeline
2liquid reservoir 18Q mouth or M mouth and N mouth, condenser/evaporator 21E mouth or F mouth; When evaporimeter second 16 and hot-blast valve second 13 and defrosting return that liquid valve second 14 is communicated with and supplying valve second 15 and return-air valve second 12 are closed, evaporimeter first 11 is communicated with supplying valve first 10 return-air valve first 7 and hot-blast valve first 8 and defrosting return liquid valve first 9 when closing, then realize the exchange roles of evaporimeter first 11 evaporimeter second 16; The quantity of evaporimeter second 16 can be 1, also can be multiple stage; The quantity of evaporimeter first 11 can be 1, also can be multiple stage.
Embodiment 2: with reference to figure 2, a kind of CO not with special defrosting compressor
2cascade refrigeration system, wherein CO
2cascade system is: high-temperature level compressor 2 exports and returns high-temperature level compressor 2 entrance through high-temperature level condenser 1, high-temperature level liquid reservoir 5, high-temperature level choke valve 22 and condenser/evaporator 21H mouth and G mouth successively by pipeline; CO2 compressor 3 exports by pipeline successively through bleed pressure regulator 4, condenser/evaporator 21E mouth or F mouth and L mouth, CO
2liquid reservoir 18M mouth and Y mouth, CO
2choke valve 19, CO
2low pressure recycle cylinder 20A mouth or C mouth and B mouth, CO
2pump 17, supplying valve second 15, evaporimeter second 16, return-air valve second 12, CO
2low pressure recycle cylinder 20A mouth or C mouth and D mouth return CO2 compressor 3 entrance; It is characterized in that hot gas defrosting is: CO2 compressor 3 exports and returns liquid valve first 9, defrosting pressure-regulating valve 6, condenser/evaporator 21E mouth or F mouth through hot-blast valve first 8, evaporimeter first 11, defrosting successively by pipeline; When evaporimeter second 16 and hot-blast valve second 13 and defrosting return that liquid valve second 14 is communicated with and supplying valve second 15 and return-air valve second 12 are closed, evaporimeter first 11 is communicated with supplying valve first 10 return-air valve first 7 and hot-blast valve first 8 and defrosting return liquid valve first 9 when closing, then realize the exchange roles of evaporimeter first 11 evaporimeter second 16; The quantity of evaporimeter second 16 can be 1, also can be multiple stage; The quantity of evaporimeter first 11 can be 1, also can be multiple stage.
Claims (5)
1. the CO not with special defrosting compressor
2cascade refrigeration system, wherein CO
2cascade system is: high-temperature level compressor (2) outlet returns high-temperature level compressor (2) entrance through high-temperature level condenser (1), high-temperature level liquid reservoir (5), high-temperature level choke valve (22) and condenser/evaporator (21) H mouth and G mouth successively by pipeline; CO
2compressor (3) exports by pipeline successively through bleed pressure regulator (4), condenser/evaporator (21) E mouth or F mouth and L mouth, CO
2liquid reservoir (18) M mouth or Q mouth and Y mouth, CO
2choke valve (19), CO
2low pressure recycle cylinder (20) A mouth or C mouth and B mouth, CO
2pump (17), supplying valve second (15), evaporimeter second (16), return-air valve second (12), CO
2low pressure recycle cylinder (20) A mouth or C mouth and D mouth return CO
2compressor (3) entrance; It is characterized in that hot gas defrosting is: CO
2compressor (3) outlet returns liquid valve first (9), defrosting pressure-regulating valve (6), CO through hot-blast valve first (8), evaporimeter first (11), defrosting successively by pipeline
2liquid reservoir (18) Q mouth or M mouth and N mouth, condenser/evaporator (21) E mouth or F mouth.
2. the CO not with special defrosting compressor
2cascade refrigeration system, wherein CO
2cascade system is: high-temperature level compressor (2) outlet returns high-temperature level compressor (2) entrance through high-temperature level condenser (1), high-temperature level liquid reservoir (5), high-temperature level choke valve (22) and condenser/evaporator (21) H mouth and G mouth successively by pipeline; CO
2compressor (3) exports by pipeline successively through bleed pressure regulator (4), condenser/evaporator (21) E mouth or F mouth and L mouth, CO
2liquid reservoir (18) M mouth and Y mouth, CO
2choke valve (19), CO
2low pressure recycle cylinder (20) A mouth or C mouth and B mouth, CO
2pump (17), supplying valve second (15), evaporimeter second (16), return-air valve second (12), CO
2low pressure recycle cylinder (20) A mouth or C mouth and D mouth return CO
2compressor (3) entrance; It is characterized in that hot gas defrosting is: CO
2compressor (3) outlet returns liquid valve first (9), defrosting pressure-regulating valve (6), condenser/evaporator (21) E mouth or F mouth through hot-blast valve first (8), evaporimeter first (11), defrosting successively by pipeline.
3. a kind of CO not with special defrosting compressor according to claim 1 or 2
2cascade refrigeration system, it is characterized in that returning that liquid valve second (14) is communicated with and supplying valve second (15) and return-air valve second (12) are closed when evaporimeter second (16) and hot-blast valve second (13) and defrosting, evaporimeter first (11) is communicated with supplying valve first (10) return-air valve first (7) and hot-blast valve first (8) and defrosting return liquid valve first (9) when closing, then realize the exchange roles of evaporimeter first (11) evaporimeter second (16).
4. a kind of CO not with special defrosting compressor according to claim 1 or 2
2cascade refrigeration system, it is characterized in that the quantity of evaporimeter second (16) can be 1, also can be multiple stage; The quantity of evaporimeter first (11) can be 1, also can be multiple stage.
5. a kind of CO not with special defrosting compressor according to claim 3
2cascade refrigeration system, it is characterized in that the quantity of evaporimeter second (16) can be 1, also can be multiple stage; The quantity of evaporimeter first (11) can be 1, also can be multiple stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741535.9A CN105241107A (en) | 2015-11-05 | 2015-11-05 | CO2 cascade refrigeration system without dedicated defrosting compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510741535.9A CN105241107A (en) | 2015-11-05 | 2015-11-05 | CO2 cascade refrigeration system without dedicated defrosting compressor |
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|---|---|
| CN105241107A true CN105241107A (en) | 2016-01-13 |
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|---|---|---|---|
| CN201510741535.9A Pending CN105241107A (en) | 2015-11-05 | 2015-11-05 | CO2 cascade refrigeration system without dedicated defrosting compressor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0639745A1 (en) * | 1993-03-08 | 1995-02-22 | Daikin Industries, Limited | Refrigerator |
| CN201072271Y (en) * | 2007-07-31 | 2008-06-11 | 南京五洲制冷集团中天空调有限公司 | Energy-saving defrosting heat pump units |
| CN201964693U (en) * | 2011-01-07 | 2011-09-07 | 吴家伟 | Evaporator capable of simultaneously realizing refrigeration and hot working medium defrosting |
| CN104567071A (en) * | 2014-12-24 | 2015-04-29 | 松下压缩机(大连)有限公司 | Carbon dioxide and fluorine cascade refrigeration and defrosting system |
| CN205137980U (en) * | 2015-11-05 | 2016-04-06 | 吴家伟 | Do not take CO2 overlapping refrigerating system of special defrosting compressor |
-
2015
- 2015-11-05 CN CN201510741535.9A patent/CN105241107A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0639745A1 (en) * | 1993-03-08 | 1995-02-22 | Daikin Industries, Limited | Refrigerator |
| CN201072271Y (en) * | 2007-07-31 | 2008-06-11 | 南京五洲制冷集团中天空调有限公司 | Energy-saving defrosting heat pump units |
| CN201964693U (en) * | 2011-01-07 | 2011-09-07 | 吴家伟 | Evaporator capable of simultaneously realizing refrigeration and hot working medium defrosting |
| CN104567071A (en) * | 2014-12-24 | 2015-04-29 | 松下压缩机(大连)有限公司 | Carbon dioxide and fluorine cascade refrigeration and defrosting system |
| CN205137980U (en) * | 2015-11-05 | 2016-04-06 | 吴家伟 | Do not take CO2 overlapping refrigerating system of special defrosting compressor |
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Application publication date: 20160113 |
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