CN216620339U - Refrigeration and defrosting system - Google Patents
Refrigeration and defrosting system Download PDFInfo
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- CN216620339U CN216620339U CN202122778449.9U CN202122778449U CN216620339U CN 216620339 U CN216620339 U CN 216620339U CN 202122778449 U CN202122778449 U CN 202122778449U CN 216620339 U CN216620339 U CN 216620339U
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Abstract
The utility model relates to the technical field of refrigeration, and provides a refrigeration and defrosting system. The utility model provides a refrigeration and defrosting system, comprising: the refrigeration subsystem, carry cold subsystem, defrosting subsystem and a plurality of evaporimeters of connecting in parallel, carry cold subsystem and defrosting subsystem respectively with a plurality of evaporimeters intercommunication that connect in parallel, carry cold subsystem, defrosting subsystem respectively with refrigeration subsystem thermal coupling. According to the refrigeration and defrosting system provided by the utility model, the refrigeration subsystem, the defrosting subsystem and the carrier refrigeration subsystem are arranged, wherein the refrigeration subsystem and the defrosting subsystem are thermally coupled, so that the cold energy generated after defrosting of the defrosting subsystem can be recycled, and meanwhile, the heat generated by the refrigeration subsystem can be recycled, so that the heat and the cold energy generated in the refrigeration and defrosting processes are fully utilized while the refrigeration and defrosting effects are realized, the utilization rate of the refrigeration and defrosting system is improved, and the waste of resources in the refrigeration and defrosting processes is effectively reduced.
Description
Technical Field
The utility model relates to the technical field of refrigeration, in particular to a refrigeration and defrosting system.
Background
The carbon dioxide refrigerating technology is used for a low-temperature refrigeration house refrigerating system, and the characteristics of high operating efficiency, safety and environmental friendliness are important development directions of the low-temperature refrigerating system in the future. At present, the defrosting mode of an air cooler of a large-scale low-temperature refrigerating system mainly adopts water defrosting and glycol defrosting. The water defrosting has the advantages that the defrosting medium is low in price, the defrosting time is relatively short, cleanness is provided for the evaporator, and the defects that the freezing point of water is high, ice blockage or incomplete defrosting and the like are easy to occur when the water defrosting is applied to a low-temperature place; the glycol defrosting is realized by adding a glycol heat exchange tube specially used for defrosting in an air cooler, and the mode has the advantages that the freezing point is low, accumulated water cannot cause ice blockage, and no liquid hammer phenomenon exists.
However, in the prior art, no matter which defrosting method is adopted to defrost the air cooler, the problems of waste heat of exhaust gas of the compressor, waste of cooling capacity of the discharged liquid after defrosting, low heat or cooling capacity recycling rate of a refrigerating and defrosting system and the like exist.
SUMMERY OF THE UTILITY MODEL
The utility model provides a refrigeration and defrosting system, which aims to overcome the defect that the heat or cold recycling rate of the refrigeration and defrosting system is low in the prior art.
The utility model provides a refrigeration and defrosting system, comprising: the refrigeration subsystem, carry cold subsystem, defrosting subsystem and a plurality of evaporimeters of connecting in parallel, carry cold subsystem with the defrosting subsystem respectively with a plurality of evaporimeters intercommunication that connect in parallel, carry cold subsystem, the defrosting subsystem respectively with the refrigeration subsystem thermal coupling.
According to a refrigeration and defrost system provided by the present invention, said refrigeration subsystem comprises: a compressor; a first inlet of the heat recoverer is communicated with an outlet of the compressor; an inlet of the condenser is communicated with a first outlet of the heat recoverer; a first inlet of the supercooling liquid storage device is communicated with an outlet of the condenser; a throttle valve, the throttle valve inlet communicating with the first outlet of the subcooled reservoir; and a first inlet of the condensation evaporator is communicated with the throttling valve outlet, and a first outlet of the condensation evaporator is communicated with an inlet of the compressor.
According to a refrigeration and defrost system provided by the present invention, the defrost subsystem comprises: a plurality of parallel first tubes, a first end of each of said first tubes communicating with a first outlet of said evaporator and a second end of each of said first tubes communicating with a second inlet of said subcooling reservoir; a first end of the second pipeline is communicated with a second outlet of the heat recoverer; a plurality of third pipes connected in parallel, a first end of each of the third pipes being connected to the second pipe, and a second end of each of the third pipes being in communication with the first inlet of one of the evaporators; and a second outlet of the supercooling liquid storage device is communicated with a second inlet of the heat recoverer.
According to a refrigeration and defrosting system provided by the present invention, the defrosting subsystem further comprises: and each first electromagnetic valve is arranged on one third pipeline.
According to a refrigeration and defrosting system provided by the present invention, the defrosting subsystem further comprises: the first circulating pump is arranged on the second pipeline.
According to the refrigeration and defrosting system provided by the utility model, the cooling subsystem comprises: a fourth pipe, a first end of the fourth pipe being communicated with the second inlet of the condensing evaporator; a plurality of fifth pipelines, wherein a first end of each fifth pipeline is communicated with a second end of the fourth pipeline, and a second end of each fifth pipeline is communicated with a second outlet of one evaporator; a sixth pipeline, a first end of which communicates with the second outlet of the condensing evaporator; a plurality of seventh pipes, a first end of each of the seventh pipes being communicated with a second end of the sixth pipe, and a second end of each of the seventh pipes being communicated with a second inlet of one of the evaporators; a plurality of second solenoid valves, each of which is provided in each of the seventh pipes, respectively.
According to the refrigeration and defrosting system provided by the utility model, the cooling subsystem further comprises: and the second circulating pump is arranged on the sixth pipeline.
According to the refrigeration and defrosting system provided by the utility model, the cooling subsystem further comprises: and each fan is arranged corresponding to one evaporator.
According to the refrigeration and defrosting system provided by the utility model, the refrigeration subsystem, the defrosting subsystem and the carrier refrigeration subsystem are arranged, wherein the refrigeration subsystem and the defrosting subsystem are thermally coupled, so that the cold energy generated after defrosting of the defrosting subsystem can be recycled, and meanwhile, the heat generated by the refrigeration subsystem can be recycled, so that the heat and the cold energy generated in the refrigeration and defrosting process are fully utilized while the refrigeration and defrosting effect is realized, the utilization rate of the refrigeration and defrosting system is improved, and the waste of resources in the refrigeration and defrosting process is effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings needed for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a refrigeration and defrosting system according to the present invention;
reference numerals:
11: a compressor; 12: a heat recovery device; 13: a condenser;
14: a super-cooled reservoir; 15: a condensing evaporator; 16: a throttle valve;
21: a first pipeline; 22: a second pipeline; 23: a third pipeline;
24: a first solenoid valve; 25: a first circulation pump; 31: a fourth pipeline;
32: a fifth pipeline; 33: a sixth pipeline; 34: a seventh pipeline;
35: a second solenoid valve; 36: a second circulation pump; 37: a fan;
40: an evaporator.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
The features of the terms first and second in the description and in the claims of the utility model may explicitly or implicitly include one or more of these features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The refrigeration and defrost system of the present invention is described below in conjunction with fig. 1.
The embodiment of the utility model provides a refrigeration and defrosting system, which comprises: a refrigeration subsystem, a carrier refrigeration subsystem, a defrost subsystem, and a plurality of evaporators 40 in parallel. The carrier cooling subsystem and the defrosting subsystem are respectively communicated with the plurality of evaporators 40 connected in parallel, and are respectively thermally coupled with the refrigeration subsystem.
Specifically, when the evaporator 40 needs to refrigerate, the cooling subsystem is started, the carbon dioxide gas in the evaporator 40 flows back to the cooling subsystem through the cooling subsystem, exchanges heat with the refrigerant liquid in the cooling subsystem and is condensed into liquid, the liquid enters the evaporator 40 through the cooling subsystem, evaporates and absorbs heat in the evaporator 40 and is changed into gas, and the refrigeration phenomenon is generated.
When the evaporator 40 needs defrosting, the defrosting subsystem is started, the defrosting subsystem heats the coil of the evaporator to defrost the evaporator 40, the temperature of glycol which exchanges heat with the coil of the evaporator 40 is low, and low-temperature glycol enters the refrigeration subsystem to exchange heat with a refrigerant in the refrigeration subsystem, so that the temperature of the refrigerant liquid in the condenser 13 in the refrigeration subsystem is reduced, the liquid supercooling degree of the refrigeration subsystem is improved, and the cold energy of the defrosting subsystem is recycled. Further, the glycol heated by the defrosting subsystem to the coil of the evaporator 40 can also enter the heat recoverer 12 in the refrigeration subsystem to exchange heat with the high-temperature gas at the refrigerant side in the heat recoverer 12 to realize the second heating, and then the heated glycol enters the evaporator 40 again to heat the coil of the evaporator 40 to realize the defrosting of the evaporator 40, so that the heat generated in the refrigeration subsystem is recycled.
According to the refrigeration and defrosting system provided by the embodiment of the utility model, the refrigeration subsystem, the defrosting subsystem and the carrier refrigeration subsystem are arranged, wherein the refrigeration subsystem and the defrosting subsystem are thermally coupled, so that the cold energy generated after defrosting of the defrosting subsystem can be recycled, and meanwhile, the heat generated by the refrigeration subsystem can be recycled, so that the refrigeration and defrosting effects are realized, meanwhile, the heat and the cold energy generated in the refrigeration and defrosting process are fully utilized, the utilization rate of the refrigeration and defrosting system is improved, and the waste of cold and heat resources in the refrigeration and defrosting process is effectively reduced.
As shown in fig. 1, in one embodiment of the utility model, a refrigeration subsystem comprises: the system comprises a compressor 11, a heat recoverer 12, a condenser 13, a supercooling liquid storage device 14, a condensation evaporator 15 and a throttle valve 16. An outlet of the compressor 11 is communicated with a first inlet of the heat recoverer 12, a first outlet of the heat recoverer 12 is communicated with an inlet of the condenser 13, an outlet of the condenser 13 is communicated with a first inlet of the supercooling liquid storage device 14, a first outlet of the supercooling liquid storage device 14 is communicated with an inlet of the throttle valve 16, an outlet of the throttle valve 16 is communicated with a first inlet of the condensation evaporator 15, and a first outlet of the condensation evaporator 15 is communicated with an inlet of the compressor 11.
Specifically, the low-pressure refrigerant gas enters the compressor 11, is pressurized, and then enters the heat recovery unit 12, and the high-temperature and high-pressure refrigerant gas is first cooled by the ethylene glycol with a lower temperature in the heat recovery unit 12, and then enters the condenser 13 to be further condensed into high-pressure liquid. The high-pressure liquid enters the supercooling liquid storage device 14 to exchange heat with the glycol liquid with lower temperature, and is cooled into the high-pressure liquid with a certain supercooling degree, so that the high-pressure liquid has larger unit refrigerating capacity, and the refrigerating effect of the refrigerating subsystem is improved. The liquid refrigerant flowing out of the supercooling liquid reservoir 14 is throttled by the throttle valve 16 and depressurized into the condensing evaporator 15, and is evaporated into low-pressure gas, and then the low-pressure gas enters the compressor 11 again to be pressurized, thereby completing the cycle.
In the present embodiment, the sub-cooling reservoir 14 includes a shell side and a tube side, the high-pressure refrigerant stored in the shell side is a liquid with a higher temperature, and the tube side of the sub-cooling reservoir 14 is ethylene glycol with a lower temperature after defrosting. The glycol liquid exchanges heat with the high-pressure liquid refrigerant, is heated for the first time, and the temperature is increased, so that the heat recovery rate of the defrosting subsystem is improved.
Further, in the present embodiment, the first inlet of the heat recovery unit 12 is a refrigerant inlet, and the first outlet is a refrigerant outlet. The first inlet of the sub-cooling reservoir 14 is a refrigerant inlet, and the first outlet of the sub-cooling reservoir 14 is a refrigerant outlet. The first inlet of the condenser-evaporator 15 is a refrigerant inlet, and the first outlet is a refrigerant outlet.
Alternatively, the refrigerant may be a natural working fluid or a fluorocarbon refrigerant.
Alternatively, the defrosting medium used may be a refrigerant, an alcohol or a water-borne refrigerant.
Optionally, the compressor 11 may be any one of a scroll compressor, a rotor compressor, a screw compressor, a piston compressor, or other type of compressor, and the variable flow rate mode is adjusted by ac frequency conversion or dc frequency conversion, and the flow rate adjustment of the working medium may also be realized by a working medium unloading and loading mode.
Alternatively, the condenser 13 may be an air-cooled, water-cooled, evaporative or other type heat exchanger. The recuperator 12 and the condenser-evaporator 15 can be plate heat exchangers, double-pipe heat exchangers, plate-shell heat exchangers or other types of heat exchangers.
Alternatively, the throttle valve 16 may be an electronic expansion valve, a thermal expansion valve, a capillary tube, or an orifice throttling device.
According to the refrigeration and defrosting system provided by the embodiment of the utility model, the supercooling liquid storage device comprising the shell pass and the tube pass is arranged, wherein the refrigerant liquid with higher temperature is stored in the shell pass, the low-temperature glycol after defrosting is stored in the tube pass, and the glycol with lower temperature and the liquid refrigerant stored in the supercooling liquid storage device are subjected to heat exchange, so that the temperature of the refrigerant can be further reduced, the supercooling degree of the refrigerant is increased, and the refrigeration effect is improved. Meanwhile, the heat storage medium in the refrigeration and defrosting system provided by the embodiment of the utility model is the original refrigerant liquid in the supercooling liquid storage device, and devices such as a glycol tank and the like do not need to be additionally arranged to collect glycol, so that the system is simple and compact in structure, the occupancy rate of a machine room or a roof space is low, and the space is saved.
As shown in FIG. 1, in one embodiment of the present invention, the defrost subsystem comprises: a plurality of parallel first lines 21, second lines 22 and a plurality of parallel third lines 23. A first outlet of each first pipeline 21 is communicated with a second inlet of the supercooling liquid reservoir 14, a second outlet of the supercooling liquid reservoir 14 is communicated with a second inlet of the heat recoverer 12, a second outlet of the heat recoverer 12 is communicated with a first end of a second pipeline 22, a second end of the second pipeline 22 is communicated with a plurality of third pipelines 23 connected in parallel, a first end of each third pipeline 23 is communicated with the second pipeline 22, and a second end of each third pipeline 23 is communicated with a first inlet of one evaporator 40.
Specifically, when the evaporator 40 requires defrosting, the relatively low temperature glycol liquid from the evaporator 40 enters the subcooling reservoir 14 to exchange heat with the high-pressure liquid, the glycol is heated for the first time, and the high-pressure liquid in the subcooling reservoir 14 is subcooled. The heated glycol enters the heat recovery device 12 from the second outlet of the supercooling liquid reservoir 14 to exchange heat with the high-temperature gas on the refrigerant side, so that the heated glycol is heated for the second time, and the heated glycol enters each evaporator 40 through the second pipeline 22 and the third pipeline 23 to defrost each evaporator 40. Meanwhile, the glycol is cooled to a lower temperature liquid in the evaporator 40, and the low temperature glycol enters the supercooling reservoir 14 from the evaporator 40 to complete a defrosting cycle.
Further, in one embodiment of the present invention, the defrost subsystem further includes a plurality of first solenoid valves 24. Each first solenoid valve 24 is arranged on a respective third line 23.
Specifically, in the embodiment described above, the first solenoid valve 24 opens when the heat provided by the high pressure liquid refrigerant in the subcooling reservoir 14 is sufficient to heat the glycol.
Further, in one embodiment of the present invention, the defrosting subsystem further comprises a first circulation pump 25, and the first circulation pump 25 is disposed in the second pipeline 22.
Specifically, when the evaporator 40 needs defrosting, the first electromagnetic valve 24 on the third pipeline 23 connected to the evaporator 40 is opened, and the first circulation pump 25 on the second pipeline 22 is started, so that the glycol return liquid heated in the heat recovery unit 12 enters the evaporator 40.
Further, in the above-described embodiment, the second inlet of the sub-cooling reservoir 14 is a glycol inlet, and the second outlet of the sub-cooling reservoir 14 is a glycol outlet. The second inlet of the heat recoverer 12 is an ethylene glycol inlet, and the second outlet of the heat recoverer 12 is an ethylene glycol outlet.
Alternatively, the first solenoid valve 24 may be a manual shut-off valve or a ball valve. The first circulation pump 25 may be a centrifugal, axial, mixed flow, reciprocating or other type circulation pump.
It should be noted that: in the embodiment shown in fig. 1, the number of evaporators 40 is three, and accordingly, the defrosting subsystem has three groups, each group defrosting one evaporator 40. It can be understood that: the number of evaporators 40 may be plural, and accordingly, the defrost subsystem may include plural sets.
According to the refrigeration and defrosting system provided by the embodiment of the utility model, when the refrigeration subsystem does not operate, because a large amount of high-temperature refrigerant is stored in the shell pass of the supercooling liquid storage device, the glycol return liquid with lower temperature can still be heated, and meanwhile, the refrigerant liquid in the supercooling liquid storage device is supercooled; when the refrigeration subsystem operates, if the refrigerant liquid in the supercooling liquid storage device is less and can not provide enough heat, the glycol return liquid can be heated for the second time by the heat recovery device, so that the defrosting of the evaporator can be continuously performed independent of whether the refrigeration subsystem operates or not.
As shown in fig. 1, in one embodiment of the present invention, a carrier cooling subsystem comprises: a fourth line 31, a plurality of fifth lines 32, a sixth line 33, a plurality of seventh lines 34, and a plurality of second solenoid valves 35. A first end of each fifth pipe 32 communicates with the second outlet of the evaporator 40, a second end of each fifth pipe 32 is connected with a first end of the fourth pipe 31, a second end of the fourth pipe 31 communicates with the second inlet of the condensing evaporator 15, a second outlet of the condensing evaporator 15 communicates with a first end of the sixth pipe 33, a second end of the sixth pipe 33 communicates with a first end of each seventh pipe 34, and a second end of each seventh pipe 34 communicates with the second inlet of the evaporator 40. Each second solenoid valve 35 is provided on each seventh pipe 34, respectively.
Specifically, when there is a need to cool the evaporator 40, the second solenoid valve 35 connected to the evaporator 40 is opened, the carbon dioxide gas from the evaporator 40 is returned to the condenser-evaporator 15, exchanges heat with the refrigerant liquid and is condensed into liquid, the liquid is introduced into the evaporator 40 to be cooled through the sixth pipeline 33 and the seventh pipeline 34, the liquid is evaporated and absorbs heat in the evaporator 40 and becomes gas, a cooling phenomenon is generated, and then the gas is returned to the condenser-evaporator 15 through the fifth pipeline 32 and the fourth pipeline 31 to be circulated.
Further, in this embodiment, the carrier cooling subsystem further includes: and a second circulation pump 36, the second circulation pump 36 being provided on the sixth piping 33.
Specifically, when there is a need to cool the evaporator 40, the second electromagnetic valve 35 connected to the evaporator 40 is opened, the second circulation pump 36 is turned on, the carbon dioxide gas from the evaporator 40 returns to the condensing evaporator 15, exchanges heat with the refrigerant liquid and is condensed into liquid, the liquid enters the evaporator 40 to be cooled through the sixth pipeline 33, the second circulation pump 36 and the seventh pipeline 34, and the liquid is evaporated and absorbs heat in the evaporator 40 to become gas, thereby generating a cooling phenomenon.
Alternatively, in the present embodiment, the second circulation pump 36 may be a centrifugal, axial, mixed flow, reciprocating, or other type of circulation pump.
Further, in one embodiment of the present invention, the cooling subsystem further comprises a plurality of fans 37, each fan being disposed in correspondence with one of the evaporators 40.
Specifically, when the evaporator 40 needs to refrigerate, the second electromagnetic valve 35 is opened, the second circulation pump 36 is opened, the fan 37 provided corresponding to the evaporator 40 is opened, and the cooling subsystem is started to operate.
According to the refrigeration and defrosting system provided by the embodiment of the utility model, the refrigeration subsystem, the defrosting subsystem and the carrier refrigeration subsystem are arranged, so that heat generated in the refrigeration process of the system and cold generated in the defrosting process are mutually recycled, the heat recovery of the refrigeration system is realized in a gradient manner in the aspect of heat recovery, the recovery rate is higher, and the thermodynamic perfection degree is high.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A refrigeration and defrost system, comprising: the defrosting system comprises a refrigeration subsystem, a carrier cooling subsystem, a defrosting subsystem and a plurality of evaporators connected in parallel, wherein the carrier cooling subsystem and the defrosting subsystem are respectively communicated with the plurality of evaporators connected in parallel, and are respectively thermally coupled with the refrigeration subsystem.
2. The refrigeration and defrosting system of claim 1 wherein the refrigeration subsystem comprises:
a compressor;
a first inlet of the heat recoverer is communicated with an outlet of the compressor;
an inlet of the condenser is communicated with a first outlet of the heat recoverer;
a first inlet of the supercooling liquid storage device is communicated with an outlet of the condenser;
a throttle valve, an inlet of the throttle valve being in communication with a first outlet of the sub-cooling reservoir;
and a first inlet of the condensation evaporator is communicated with an outlet of the throttling valve, and a first outlet of the condensation evaporator is communicated with an inlet of the compressor.
3. The refrigeration and defrosting system of claim 2 wherein the defrosting subsystem comprises:
a plurality of parallel first tubes, a first end of each of said first tubes communicating with a first outlet of said evaporator and a second end of each of said first tubes communicating with a second inlet of said subcooling reservoir;
a first end of the second pipeline is communicated with a second outlet of the heat recoverer;
a plurality of third pipes connected in parallel, a first end of each of the third pipes being connected to the second pipe, and a second end of each of the third pipes being in communication with the first inlet of one of the evaporators;
and the second outlet of the supercooling liquid reservoir is communicated with the second inlet of the heat recoverer.
4. The refrigeration and defrosting system of claim 3 wherein the defrosting subsystem further comprises:
and each first electromagnetic valve is arranged on one third pipeline.
5. The refrigeration and defrosting system of claim 3 or 4 wherein the defrosting subsystem further comprises:
the first circulating pump is arranged on the second pipeline.
6. The refrigeration and defrosting system of claim 4 wherein the carrier cooling subsystem comprises:
a fourth pipe, a first end of the fourth pipe being communicated with the second inlet of the condensing evaporator;
a plurality of fifth pipelines, wherein a first end of each fifth pipeline is communicated with a second end of the fourth pipeline, and a second end of each fifth pipeline is communicated with a second outlet of one evaporator;
a sixth pipeline, a first end of which communicates with the second outlet of the condensing evaporator;
a plurality of seventh pipes, a first end of each of the seventh pipes being communicated with a second end of the sixth pipe, and a second end of each of the seventh pipes being communicated with a second inlet of one of the evaporators;
a plurality of second solenoid valves, each of which is provided in each of the seventh pipes, respectively.
7. The refrigeration and defrosting system of claim 6 wherein the carrier cooling subsystem further comprises:
and the second circulating pump is arranged on the sixth pipeline.
8. The refrigeration and defrosting system of claim 6 wherein the carrier cooling subsystem further comprises:
and each fan is arranged corresponding to one evaporator.
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| CN202122778449.9U CN216620339U (en) | 2021-11-12 | 2021-11-12 | Refrigeration and defrosting system |
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| CN113945022A (en) * | 2021-11-12 | 2022-01-18 | 华商国际工程有限公司 | Refrigeration and defrosting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113945022A (en) * | 2021-11-12 | 2022-01-18 | 华商国际工程有限公司 | Refrigeration and defrosting system |
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