CN110553428B - Cold-carrying circulating system - Google Patents
Cold-carrying circulating system Download PDFInfo
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- CN110553428B CN110553428B CN201910796753.0A CN201910796753A CN110553428B CN 110553428 B CN110553428 B CN 110553428B CN 201910796753 A CN201910796753 A CN 201910796753A CN 110553428 B CN110553428 B CN 110553428B
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- 230000001172 regenerating effect Effects 0.000 claims abstract description 33
- 238000005057 refrigeration Methods 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 157
- 239000002826 coolant Substances 0.000 claims description 16
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 claims description 10
- 239000001294 propane Substances 0.000 claims description 6
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 claims description 5
- 239000001282 iso-butane Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 abstract description 6
- 201000009240 nasopharyngitis Diseases 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 239000007791 liquid phase Substances 0.000 abstract description 4
- 238000007710 freezing Methods 0.000 abstract description 2
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- RIQRGMUSBYGDBL-UHFFFAOYSA-N 1,1,1,2,2,3,4,5,5,5-decafluoropentane Chemical compound FC(F)(F)C(F)C(F)C(F)(F)C(F)(F)F RIQRGMUSBYGDBL-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229960004624 perflexane Drugs 0.000 description 2
- ZJIJAJXFLBMLCK-UHFFFAOYSA-N perfluorohexane Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F ZJIJAJXFLBMLCK-UHFFFAOYSA-N 0.000 description 2
- FYIRUPZTYPILDH-UHFFFAOYSA-N 1,1,1,2,3,3-hexafluoropropane Chemical compound FC(F)C(F)C(F)(F)F FYIRUPZTYPILDH-UHFFFAOYSA-N 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
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Classifications
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention provides a cold carrying circulation system, which comprises: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the cold-carrying circulation system provided by the invention utilizes the common cold circulation of pure or mixed working medium with low freezing point as cold-carrying circulation, and simultaneously adopts a high-reliability common cold temperature region driving element for driving, so that a low-reliable low-temperature circulation pump is avoided, the cold quantity remote transmission at minus 60 ℃ and even a liquid nitrogen temperature region can be realized, and the cold-carrying working medium at the user side is in a liquid phase state, is easy to distribute uniformly, and is particularly suitable for low-temperature demand occasions of split users.
Description
Technical Field
The invention relates to the technical field of cold carrying, in particular to a cold carrying circulating system.
Background
Cold-carrying technologies are often used in central air conditioning and industrial refrigeration applications, and are less applicable at low temperatures. In the traditional cold carrying circulation, a cold carrying agent is firstly cooled in an evaporator and then pumped to a cooled object, and only the cold conveying function exists, but the cold carrying agent has no refrigerating effect. At present, in the fields of scientific research, medical treatment, pharmacy, industrial production and the like, the refrigerating temperature of the occasions is required to be below 60 ℃ below zero or even reach the temperature of liquid nitrogen, and meanwhile, the occasions have the requirements of no vibration noise, high safety and reliability and the like, such as low-temperature cold therapy, a low-temperature refrigerator, a low-temperature cold storage, a low-temperature constant-temperature bath system and the like, but a split structure is adopted, and the remote cold transmission by using a secondary refrigerant is a feasible scheme. However, the use of pumped coolant is not feasible in the low temperature region due to the lack of reliable, commercially available low flow cryogenic circulating pumps in the sub-60 ℃ region.
Disclosure of Invention
In view of the above, there is a need to provide a safe and reliable cold-carrying circulation system at-60 ℃ or below, even up to the temperature of liquid nitrogen, to overcome the drawbacks of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a cooling cycle system, including: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the cold carrier circulation loop comprises a cold carrier drive pump (201), a cold carrier condenser (202), a cold carrier precision oil separator (203) and a user side (204); wherein:
a high-pressure refrigerant outlet of the mixed working medium compressor (101) is connected with a refrigerant high-pressure inlet of the mixed working medium condenser (102), a refrigerant high-pressure outlet of the mixed working medium condenser (102) is connected with a high-pressure refrigerant inlet of the regenerative heat exchanger (103), a high-pressure refrigerant outlet of the regenerative heat exchanger (103) is connected with a refrigerant high-pressure inlet of the mixed working medium throttle valve (104), and a refrigerant low-pressure outlet of the mixed working medium throttle valve (104) is connected with a low-pressure refrigerant inlet of the regenerative heat exchanger (103);
a high-pressure secondary refrigerant outlet of the secondary refrigerant drive pump (201) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant condenser (202); a high-pressure secondary refrigerant outlet of the secondary refrigerant condenser (202) is connected with a high-pressure secondary refrigerant inlet of the precision oil separator (203); a high-pressure secondary refrigerant outlet of the precision oil separator (203) is connected with a first high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a first high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the user side (204); a high-pressure secondary refrigerant outlet of the user side (204) is connected with a second high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a second high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a low-pressure secondary refrigerant inlet of the secondary refrigerant drive pump (201); the low-pressure oil outlet of the precise oil separator (203) is connected with the low-pressure refrigerating medium inlet of the refrigerating medium driving pump (201).
In some preferred embodiments, the customer side (204) may be divided into the low temperature needs of n split customers, n ≧ 2.
In some preferred embodiments, the coolant comprises at least one of perfluorohexane, HFC-4310mee, HFE-7100, HFO-1336mzzZ, SF-70, and SF-10.
In another aspect, the present invention further provides a cooling cycle system, including: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the refrigerating cycle loop comprises a refrigerating medium compressor (2010), a refrigerating medium condenser (202), a mixed working medium refrigerating medium precooling heat exchanger (206), a refrigerating medium precise oil separator (203) and a user side (204); wherein:
a high-pressure refrigerant outlet of the mixed working medium compressor (101) is connected with a refrigerant high-pressure inlet of the mixed working medium condenser (102), a high-pressure refrigerant outlet of the mixed working medium condenser (102) is connected with a high-pressure refrigerant inlet of the secondary refrigerant precooling heat exchanger (206), a high-pressure refrigerant outlet of the secondary refrigerant precooling heat exchanger (206) is connected with a high-pressure refrigerant inlet of the backheating heat exchanger (103), a high-pressure refrigerant outlet of the backheating heat exchanger (103) is connected with a refrigerant high-pressure inlet of the mixed working medium throttle valve (104), and a refrigerant low-pressure outlet of the mixed working medium throttle valve (104) is connected with a low-pressure refrigerant inlet of the backheating heat exchanger (103);
a high-pressure secondary refrigerant outlet of the secondary refrigerant compressor (2010) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant condenser (202); a high-pressure secondary refrigerant outlet of the secondary refrigerant condenser (202) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant precooling heat exchanger (206); a high-pressure secondary refrigerant outlet of the secondary refrigerant precooling heat exchanger (206) is connected with a high-pressure secondary refrigerant inlet of the precision oil separator (203); a high-pressure secondary refrigerant outlet of the precision oil separator (203) is connected with a first high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a first high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the user side (204); a high-pressure secondary refrigerant outlet of the user side (204) is connected with a second high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a second high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant throttle valve (205); a high-pressure secondary refrigerant outlet of the secondary refrigerant throttling valve (205) is connected with a low-pressure secondary refrigerant inlet of the secondary refrigerant precooling heat exchanger (206); a low-pressure coolant outlet of the coolant pre-cooling heat exchanger (206) is connected to a low-pressure coolant inlet of the coolant compressor (2010); the low-pressure oil outlet of the precision oil separator (203) is connected with the low-pressure refrigerating medium inlet of the refrigerating medium compressor (2010).
In some preferred embodiments, the customer side (204) may be divided into the low temperature needs of n split customers, n ≧ 2.
In some preferred embodiments, the coolant comprises at least one of isobutane, propane, R22, R1234ze (E), R134a, R152a, R227ea, R236 ea.
The invention adopts the technical scheme that the method has the advantages that:
the invention provides a cold carrying circulation system, which comprises: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the cold-carrying circulation system provided by the invention utilizes the common cold circulation of pure or mixed working medium with low freezing point as cold-carrying circulation, and adopts a high-reliability common cold temperature region compressor and pump drive, so that a low-reliable low-temperature circulation pump is avoided, the cold quantity remote transmission at-60 ℃ and even a liquid nitrogen temperature region can be realized, the cold-carrying working medium at the user side is in a liquid phase state, and the cold-carrying circulation loop is easy to distribute uniformly, and is particularly suitable for low-temperature demand occasions of split users.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a cooling cycle system provided in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a cooling cycle system according to embodiment 2 of the present invention.
Fig. 3 is a schematic user-side structure diagram of a cooling cycle system provided in embodiment 1 or 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a cooling cycle system according to embodiment 1 of the present invention, which only shows portions related to the embodiment of the present invention for convenience of description, and the details are as follows.
The present invention provides a cooling cycle system 100 including: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the cold carrier circulation loop comprises a cold carrier drive pump (201), a cold carrier condenser (202), a cold carrier precision oil separator (203) and a user side (204); wherein:
a high-pressure refrigerant outlet of the mixed working medium compressor (101) is connected with a refrigerant high-pressure inlet of the mixed working medium condenser (102), a refrigerant high-pressure outlet of the mixed working medium condenser (102) is connected with a high-pressure refrigerant inlet of the regenerative heat exchanger (103), a high-pressure refrigerant outlet of the regenerative heat exchanger (103) is connected with a refrigerant high-pressure inlet of the mixed working medium throttle valve (104), and a refrigerant low-pressure outlet of the mixed working medium throttle valve (104) is connected with a low-pressure refrigerant inlet of the regenerative heat exchanger (103);
a high-pressure secondary refrigerant outlet of the secondary refrigerant drive pump (201) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant condenser (202); a high-pressure secondary refrigerant outlet of the secondary refrigerant condenser (202) is connected with a high-pressure secondary refrigerant inlet of the precision oil separator (203); a high-pressure secondary refrigerant outlet of the precision oil separator (203) is connected with a first high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a first high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the user side (204); a high-pressure secondary refrigerant outlet of the user side (204) is connected with a second high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a second high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a low-pressure secondary refrigerant inlet of the secondary refrigerant drive pump (201); the low-pressure oil outlet of the precise oil separator (203) is connected with the low-pressure refrigerating medium inlet of the refrigerating medium driving pump (201).
Referring to FIG. 3, the user side (204) can be divided into the low temperature requirements of n split users, where n is greater than or equal to 2
When a temperature area required by the refrigerating cycle system is-80 ℃, at least one of perfluorohexane, HFC-4310mee, HFE-7100, HFO-1336mzzZ, SF-70 and SF-10 can be selected as a refrigerating medium; when the required temperature is-100 ℃, at least one of HFE-7100, SF-70 and SF-10 can be selected as the refrigerating medium.
The embodiment adopts the high-reliability common cold temperature region to drive the pump, avoids using a low-reliability low-temperature circulating pump, can realize the cold quantity remote transmission at the temperature of minus 60 ℃ and even a liquid nitrogen temperature region, is easy to distribute uniformly when the cold-carrying working medium at the side of a user is in a liquid phase state, and is particularly suitable for low-temperature demand occasions of split users.
Example 2
Referring to fig. 2, a schematic structural diagram of a cooling cycle system according to embodiment 2 of the present invention is shown, and for convenience of illustration, only the relevant portions related to the embodiment of the present invention are shown, which is described in detail below.
The invention provides a cold-carrying circulation system 200, comprising: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the refrigerating cycle loop comprises a refrigerating medium compressor (2010), a refrigerating medium condenser (202), a mixed working medium refrigerating medium precooling heat exchanger (206), a refrigerating medium precise oil separator (203) and a user side (204); wherein:
a high-pressure refrigerant outlet of the mixed working medium compressor (101) is connected with a refrigerant high-pressure inlet of the mixed working medium condenser (102), a high-pressure refrigerant outlet of the mixed working medium condenser (102) is connected with a high-pressure refrigerant inlet of the secondary refrigerant precooling heat exchanger (206), a high-pressure refrigerant outlet of the secondary refrigerant precooling heat exchanger (206) is connected with a high-pressure refrigerant inlet of the backheating heat exchanger (103), a high-pressure refrigerant outlet of the backheating heat exchanger (103) is connected with a refrigerant high-pressure inlet of the mixed working medium throttle valve (104), and a refrigerant low-pressure outlet of the mixed working medium throttle valve (104) is connected with a low-pressure refrigerant inlet of the backheating heat exchanger (103);
a high-pressure secondary refrigerant outlet of the secondary refrigerant compressor (2010) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant condenser (202); a high-pressure secondary refrigerant outlet of the secondary refrigerant condenser (202) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant precooling heat exchanger (206); a high-pressure secondary refrigerant outlet of the secondary refrigerant precooling heat exchanger (206) is connected with a high-pressure secondary refrigerant inlet of the precision oil separator (203); a high-pressure secondary refrigerant outlet of the precision oil separator (203) is connected with a first high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a first high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the user side (204); a high-pressure secondary refrigerant outlet of the user side (204) is connected with a second high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a second high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant throttle valve (205); a high-pressure secondary refrigerant outlet of the secondary refrigerant throttling valve (205) is connected with a low-pressure secondary refrigerant inlet of the secondary refrigerant precooling heat exchanger (206); a low-pressure coolant outlet of the coolant pre-cooling heat exchanger (206) is connected to a low-pressure coolant inlet of the coolant compressor (2010); the low-pressure oil outlet of the precision oil separator (203) is connected with the low-pressure refrigerating medium inlet of the refrigerating medium compressor (2010).
Referring to FIG. 3, the user side (204) can be divided into the low temperature requirements of n split users, where n is greater than or equal to 2.
When a temperature zone required by the refrigerating cycle system is-80 ℃, at least one of isobutane, propane, R22, R1234ze (E), R134a, R152a, R227ea and R236ea can be selected as a refrigerating medium; when the required temperature is-120 ℃, at least one of isobutane, propane and R22 can be selected as the refrigerating medium; when the required temperature is-150 ℃, at least one of isobutane, propane and R22 can be selected as the refrigerating medium; when the required temperature is-170 ℃, propane can be selected as the refrigerating medium.
The embodiment adopts the high-reliability common cold temperature area compressor for driving, avoids using a low-reliability low-temperature circulating pump, can realize the cold quantity remote transmission in a temperature area of-60 ℃ and even a liquid nitrogen temperature area, is easy to distribute uniformly when the cold-carrying working medium at the side of a user is in a liquid phase state, and is particularly suitable for low-temperature demand occasions of split users.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Of course, the cooling circulation system of the present invention may have various changes and modifications, and is not limited to the specific structure of the above-described embodiments. In conclusion, the scope of the present invention should include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art.
Claims (3)
1. A cold-carrying cycle system, comprising: a mixed working medium refrigeration circulation loop and a cold-carrying circulation loop; the mixed working medium refrigerating circuit comprises a mixed working medium compressor (101), a mixed working medium condenser (102), a regenerative heat exchanger (103) and a mixed working medium throttle valve (104); the refrigerating cycle loop comprises a refrigerating medium compressor (2010), a refrigerating medium condenser (202), a mixed working medium refrigerating medium precooling heat exchanger (206), a refrigerating medium precise oil separator (203) and a user side (204); wherein:
a high-pressure refrigerant outlet of the mixed working medium compressor (101) is connected with a refrigerant high-pressure inlet of the mixed working medium condenser (102), a high-pressure refrigerant outlet of the mixed working medium condenser (102) is connected with a high-pressure refrigerant inlet of the secondary refrigerant precooling heat exchanger (206), a high-pressure refrigerant outlet of the secondary refrigerant precooling heat exchanger (206) is connected with a high-pressure refrigerant inlet of the backheating heat exchanger (103), a high-pressure refrigerant outlet of the backheating heat exchanger (103) is connected with a refrigerant high-pressure inlet of the mixed working medium throttle valve (104), and a refrigerant low-pressure outlet of the mixed working medium throttle valve (104) is connected with a low-pressure refrigerant inlet of the backheating heat exchanger (103);
a high-pressure secondary refrigerant outlet of the secondary refrigerant compressor (2010) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant condenser (202); a high-pressure secondary refrigerant outlet of the secondary refrigerant condenser (202) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant precooling heat exchanger (206); a high-pressure secondary refrigerant outlet of the secondary refrigerant precooling heat exchanger (206) is connected with a high-pressure secondary refrigerant inlet of the precision oil separator (203); a high-pressure secondary refrigerant outlet of the precision oil separator (203) is connected with a first high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a first high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the user side (204); a high-pressure secondary refrigerant outlet of the user side (204) is connected with a second high-pressure secondary refrigerant inlet of the regenerative heat exchanger (103); a second high-pressure secondary refrigerant outlet of the regenerative heat exchanger (103) is connected with a high-pressure secondary refrigerant inlet of the secondary refrigerant throttle valve (205); a high-pressure secondary refrigerant outlet of the secondary refrigerant throttling valve (205) is connected with a low-pressure secondary refrigerant inlet of the secondary refrigerant precooling heat exchanger (206); a low-pressure coolant outlet of the coolant pre-cooling heat exchanger (206) is connected to a low-pressure coolant inlet of the coolant compressor (2010); the low-pressure oil outlet of the precision oil separator (203) is connected with the low-pressure refrigerating medium inlet of the refrigerating medium compressor (2010).
2. A cold-carrying cycle system according to claim 1, wherein the user side (204) can be divided into the low temperature requirements of n split users, n ≧ 2.
3. The cold-carrier cycle system of claim 1 or 2, wherein the coolant comprises at least one of isobutane, propane, R22, R1234ze (E), R134a, R152a, R227ea, R236 ea.
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