CN110500829B - Thermal defrosting system for refrigeration system, control method and refrigeration system - Google Patents
Thermal defrosting system for refrigeration system, control method and refrigeration system Download PDFInfo
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- CN110500829B CN110500829B CN201910898825.2A CN201910898825A CN110500829B CN 110500829 B CN110500829 B CN 110500829B CN 201910898825 A CN201910898825 A CN 201910898825A CN 110500829 B CN110500829 B CN 110500829B
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- 238000010257 thawing Methods 0.000 title claims abstract description 69
- 238000005057 refrigeration Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 210
- 239000003507 refrigerant Substances 0.000 claims abstract description 163
- 238000001704 evaporation Methods 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 abstract description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 9
- 230000008020 evaporation Effects 0.000 description 4
- 239000002826 coolant Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000003682 fluorination reaction Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Defrosting Systems (AREA)
Abstract
The application relates to a thermal defrosting system for a refrigerating system, a control method and the refrigerating system, wherein the thermal defrosting system comprises the following components: a compressor (1); a condenser (2); at least two first evaporators (5), each of which is selectively operable in a refrigeration state or a defrosting state; and a second evaporator (6) for evaporating the liquid refrigerant generated by the first evaporator (5) in the defrosting state into a gaseous refrigerant; the liquid refrigerant circulation port of each first evaporator (5) is communicated with the condenser (2) in a refrigeration state and is communicated with the second evaporator (6) in a defrosting state; the gaseous refrigerant flow port of each first evaporator (5) communicates with the air inlet of the compressor (1) in a cooling state, and communicates with the air outlet of the compressor (1) in a defrosting state. The system can flexibly realize defrosting as required on the basis of saving electric energy.
Description
Technical Field
The application relates to the technical field of refrigeration system control, in particular to a thermal defrosting system for a refrigeration system, a control method and the refrigeration system.
Background
The heat exchanger in the refrigeration house refrigerating system works for a long time under the environment of low temperature and high humidity, the calandria and the heat exchanger can be frosted, the coefficient of performance of the unit can be reduced due to the growth of the frost layer, and even the whole running system can be disabled due to the excessively thick frost layer, so that the defrosting function of the low-temperature refrigeration house must be considered. There are two commonly used defrosting modes at present: the electric heating defrosting and thermal fluorination defrosting mode can well replace electric heating defrosting, and a large amount of electric energy is saved.
A thermal frost fluoride system for a refrigeration system utilizes compressor discharge air to provide heat, the discharge air is passed into an evaporator to melt an external frost layer, and the discharged air is condensed into a liquid. The defrosting process has the problem of liquid discharge, and if the liquid is not discharged in time, the liquid returns when the machine is started. For this reason, a related art known to the inventor is to add a drain tank in the system, so that the defrosting liquid is drained into the drain tank, and the drain tank is connected with the system at a low pressure.
If this part of the liquid is gasified back into the system by means of electric heating, additional electric energy will be consumed; if the liquid is discharged to the evaporator of other refrigeration houses, the operation is usually performed through a complex valve group and control logic, so that the pipeline and control of the defrosting system are complex, the cost is high, the problems of liquid return and the like are very easy to occur when the operation is improper, more than one refrigeration house is required to be refrigerated, and the defrosting according to the requirement cannot be realized.
Disclosure of Invention
The application aims to provide a thermal defrosting system for a refrigerating system, a control method and the refrigerating system, which can realize defrosting on demand on the basis of saving electric energy.
According to one aspect of the present application, there is provided a thermal frost system for a refrigeration system, comprising:
a compressor;
a condenser;
at least two first evaporators, which can be selectively operated in a refrigerating state or a defrosting state; and
the second evaporator is used for evaporating the liquid refrigerant generated by the first evaporator in the defrosting state into a gaseous refrigerant;
the liquid refrigerant circulation ports of the first evaporators are communicated with the condenser in a refrigeration state and are communicated with the second evaporators in a defrosting state; the gaseous refrigerant circulation port of each first evaporator is communicated with the air suction port of the compressor in a refrigeration state and is communicated with the air discharge port of the compressor in a defrosting state.
In some embodiments, when one first evaporator is in a defrost state, at least one of the remaining first evaporators is in a refrigerated state.
In some embodiments, a liquid supply tube set is disposed between the liquid refrigerant flowing port of each first evaporator and the condenser, and the liquid supply tube set includes:
a liquid supply main pipe, wherein the first end of the liquid supply main pipe is communicated with the condenser;
the first ends of the liquid supply branch pipes are communicated with the second ends of the liquid supply main pipes, and the second ends of the liquid supply branch pipes are respectively communicated with the liquid refrigerant circulation ports of the first evaporators; and
a plurality of first on-off valves respectively arranged on the liquid supply branch pipes; and the device is used for controlling the on-off of the liquid supply branch pipe.
In some embodiments, a gas supply pipe group is disposed between the gaseous refrigerant circulation port of each first evaporator and the gas discharge port of the compressor, the gas supply pipe group including:
the first end of the air supply main pipe is communicated with an air outlet of the compressor;
the first ends of the air supply branch pipes are communicated with the second ends of the air supply main pipes, and the second ends of the air supply branch pipes are respectively communicated with the gaseous refrigerant circulation ports of the first evaporators; and
a plurality of second on-off valves respectively arranged on the air supply branch pipes; and the control device is used for controlling the on-off of the air supply branch pipe.
In some embodiments, a drain pipe group is disposed between the liquid refrigerant flowing port of each first evaporator and the second evaporator, and the drain pipe group includes:
the first ends of the liquid discharge branch pipes are communicated with the liquid refrigerant circulation port of the first evaporator;
the first end of the liquid drain main pipe is communicated with the second end of each liquid drain branch pipe, and the second end of the liquid drain main pipe is communicated with the second evaporator; and
a plurality of third cut-off valves respectively arranged on the liquid discharge branch pipes; and the control device is used for controlling the on-off of the liquid discharge branch pipe.
In some embodiments, in the defrost state, the liquid refrigerant flow port of the second evaporator is in communication with the liquid refrigerant flow port of the first evaporator, and the gaseous refrigerant flow port of the second evaporator is in communication with the suction port of the compressor.
In some embodiments, the thermal frosting system further comprises a liquid reservoir, the liquid reservoir is communicated with the liquid refrigerant circulation port of the condenser, and the liquid refrigerant circulation port of each first evaporator is communicated with the liquid reservoir in a refrigeration state.
In some embodiments, the thermal frosting system further comprises:
the first expansion valve is arranged on a pipe between the liquid refrigerant circulation port of the first evaporator and the condenser; and/or
The second expansion valve is arranged on a pipe between the liquid refrigerant circulation port of the first evaporator and the liquid refrigerant circulation port of the second evaporator.
In some embodiments, the thermal frosting system further comprises:
the first one-way valve is arranged on a pipe between the condenser and the liquid refrigerant flowing port of the first evaporator and is used for enabling the refrigerant to flow unidirectionally from the condenser to the first evaporator;
the second one-way valve is arranged on a pipe between the liquid refrigerant circulation port of the first evaporator and the liquid refrigerant circulation port of the second evaporator and is used for enabling the refrigerant to circulate unidirectionally from the first evaporator to the second evaporator;
a third check valve arranged on a pipe between the gaseous refrigerant circulation port of the second evaporator and the air suction port of the compressor, for unidirectional circulation of the refrigerant from the second evaporator to the compressor; and/or
And the fourth one-way valve is arranged on a pipe between the exhaust port of the compressor and the gaseous refrigerant circulation port of the first evaporator and is used for enabling the refrigerant to circulate unidirectionally from the compressor to the first evaporator.
According to another aspect of the present application, a refrigeration system is presented comprising the thermal frost system for a refrigeration system of the above-described embodiments.
In some embodiments, the refrigeration system includes a refrigeration storage.
In some embodiments, the second evaporator is disposed outside the freezer.
According to still another aspect of the present application, a control method for a thermal fluoride frost system for a refrigeration system is provided, comprising:
in a refrigeration state, a liquid refrigerant circulation port of the first evaporator is communicated with the condenser, and a gaseous refrigerant circulation port is communicated with an air suction port of the compressor;
in the defrosting state, a liquid refrigerant circulation port of the first evaporator to be defrosted is communicated with the second evaporator, and a gaseous refrigerant circulation port is communicated with an exhaust port of the compressor.
In some embodiments, when the first evaporator to be defrosted is in a defrosting state, further comprising:
at least one of the remaining first evaporators is brought into a refrigeration state.
Based on the technical scheme, in the thermal defrosting system for the refrigerating system, the liquid refrigerant discharged by the first evaporator in the defrosting state can be evaporated into the gaseous refrigerant to be supplemented into the compressor by arranging the second evaporator, so that the arrangement of an electric heater to convert the liquid refrigerant into the gaseous refrigerant is omitted, and electric energy can be saved; the liquid refrigerant generated in the defrosting state of the first evaporator can be converted into the gaseous refrigerant in real time, the liquid refrigerant is not required to be introduced into other first evaporators in the refrigerating state, and the defrosting can be flexibly realized according to the requirement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of one embodiment of a thermal frost system for a refrigeration system of the present application;
FIG. 2 is a schematic diagram of the working principle of the thermal frosting system for a refrigeration system shown in FIG. 1 in a refrigeration state;
fig. 3 is a schematic diagram illustrating an operating principle of the thermal frosting system for a refrigerating system shown in fig. 1 in a frosting state.
Detailed Description
The present application is described in detail below. In the following paragraphs, the different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless explicitly stated to be non-combinable. In particular, any feature or features may be combined with one or more other features may be desired and advantageous.
The application provides a thermal defrosting system for a refrigerating system, which is hereinafter referred to as a thermal defrosting system, for example, the refrigerating system can be a refrigeration house or a container with a refrigerating function. In some embodiments, as shown in fig. 1, the thermal frost system comprises: a compressor 1, a condenser 2, at least two first evaporators 5 and a second evaporator 6.
The compressor 1 may be one compressor or a plurality of compressor units, and the compressor 1 may be a piston compressor, a screw compressor, a centrifugal compressor, a linear compressor, or the like. The condenser 2 is used to condense the high-temperature and high-pressure gas generated by the compressor 1 into a liquid and supply the liquid to each of the first evaporators 5, and in this system, one condenser 2 corresponds to a plurality of the first evaporators 5. The condenser 2 may be installed outdoors or indoors as required, and in order to play a buffering role when the working conditions change greatly, the liquid storage device 3 may be further installed, the liquid storage device 3 is communicated with the liquid refrigerant circulation ports of the condenser 2, and the liquid refrigerant circulation ports of the first evaporators 5 are communicated with the liquid storage device 3 in a refrigerating state.
Each first evaporator 5 can be selectively operated in a refrigerating state or a defrosting state, and the second evaporator 6 is used for evaporating the liquid refrigerant generated by the first evaporator 5 in the defrosting state into a gaseous refrigerant and returning the gaseous refrigerant to the air suction port of the compressor 1. The first evaporator 5 and the second evaporator 6 may also be referred to as air coolers.
The liquid refrigerant flowing port of each first evaporator 5 is communicated with the condenser 2 in a refrigeration state so as to enable the liquid refrigerant generated by the condenser 2 to enter the first evaporator; the liquid refrigerant flowing port of each first evaporator 5 communicates with the second evaporator 6 in the frosted state so that the liquid refrigerant generated in the frosted state of the first evaporator 5 enters the second evaporator 6. The gaseous refrigerant flowing port of each first evaporator 5 is communicated with the air suction port of the compressor 1 in a refrigeration state so as to enable the low-temperature low-pressure gaseous refrigerant generated by the first evaporator 5 to enter the air suction port of the compressor 1; the gaseous refrigerant flowing port of each first evaporator 5 is communicated with the exhaust port of the compressor 1 in a defrosting state, so that high-temperature and high-pressure gas generated by the compressor 1 enters the first evaporator 5 to defrost.
Further, in the defrosting state, the liquid refrigerant flowing port of the second evaporator 6 is communicated with the liquid refrigerant flowing port of the first evaporator 5, so that the liquid refrigerant generated by defrosting of the first evaporator 5 flows into the second evaporator 6; the gaseous refrigerant flowing port of the second evaporator 6 is communicated with the air suction port of the compressor 1, so that the liquid refrigerant generated by defrosting is converted into the gaseous refrigerant to be directly supplemented into the compressor 1.
This embodiment of the application has at least one of the following advantages:
1. by arranging the second evaporator 6, the liquid refrigerant generated by the first evaporator 5 in the defrosting state can be evaporated into a gaseous refrigerant to be supplemented into the compressor, so that an electric heater is omitted to convert the liquid refrigerant into the gaseous refrigerant, and electric energy can be saved.
2. By arranging the second evaporator 6, the liquid refrigerant generated when the first evaporator 5 is in the defrosting state can be converted into the gaseous refrigerant in real time, the liquid refrigerant in the liquid storage barrel is not required to be introduced into other first evaporators in the refrigerating state, such as the first evaporators in other refrigeration houses, and the defrosting can be flexibly realized according to the needs without requiring the other refrigeration houses to work.
3. In the prior art, because the liquid storage barrel is connected with the system at low pressure, if the liquid refrigerant in the liquid storage barrel is introduced into other first evaporators in a refrigerating state, a proper pressure difference needs to be established through a series of valve combinations and complex control logic, if the control parameters are improper, the liquid refrigerant is difficult to be introduced into other first evaporators through a longer pipeline, and the startup liquid return is easy to cause. The embodiment of the application omits the liquid storage barrel, can gasify the liquid refrigerant generated by defrosting in real time, does not need to establish pressure difference, can more thoroughly gasify and supplement the liquid refrigerant into the compressor, and can prevent liquid return when the compressor is started.
The thermal fluoride frost system of the present application may operate as follows.
First, each first evaporator 5 is in a refrigeration state, that is, each refrigeration system is working, for example, each refrigerator is in a refrigeration state.
Secondly, when the first evaporator 5 to be defrosted is in a defrosting state, at least one of the rest of the first evaporators 5 is in a refrigerating state. Wherein the first evaporator 5 in the defrosting state may be one, two or more, and at least one evaporator 5 is required to be in the refrigerating state because the compressor 1 is required to generate high-temperature and high-pressure gas through the refrigerating cycle.
Each first evaporator 5 may be provided with a frost layer thickness detecting means, and when it is detected that the frost layer thickness of a certain first evaporator 5 exceeds a preset thickness, or when the cooling efficiency is lower than a preset efficiency, the first evaporator 5 may be brought into a defrosting state.
The defrosting mode does not influence the normal operation of other first evaporators 5, can utilize the exhaust gas of the compressor 1 to defrost when the first evaporator 5 which is in operation is used for refrigerating, and can fully utilize the system energy.
The connection relationship of the pipes in the thermal frost system is described below.
As shown in fig. 1, a liquid supply pipe group is provided between the liquid refrigerant flow port of each first evaporator 5 and the condenser 2, and the liquid supply pipe group includes: a liquid supply main pipe 10, a plurality of liquid supply branch pipes and a plurality of first on-off valves. Wherein, the first end of the liquid supply main pipe 10 is communicated with the condenser 2, the first end of each liquid supply branch pipe is communicated with the second end of the liquid supply main pipe 10, and the second end of each liquid supply branch pipe is respectively communicated with the liquid refrigerant circulation port of each first evaporator 5; each first on-off valve is correspondingly arranged on each liquid supply branch pipe and used for controlling the on-off of the liquid supply branch pipe.
The first on-off valves are arranged on the liquid supply branch pipes corresponding to the first evaporators 5, so that the on-off of the liquid supply branch pipes can be independently controlled, and when the first evaporators 5 are in a refrigerating state, the corresponding first on-off valves are connected with the liquid supply branch pipes so as to supply liquid refrigerant generated by the condenser 2 to the first evaporators 5; when the first evaporator 5 is in a defrosting state, the corresponding first on-off valve breaks the liquid supply branch.
Still referring to fig. 1, a gas supply pipe group is provided between the gaseous refrigerant circulation port of each first evaporator 5 and the gas discharge port of the compressor 1, the gas supply pipe group including: a gas supply manifold 20, a plurality of gas supply branches, and a plurality of second on-off valves. Wherein a first end of the air supply header 20 communicates with an air discharge port of the compressor 1; the first end of each air supply branch pipe is communicated with the second end of the air supply main pipe 20, and the second end of each air supply branch pipe is respectively communicated with the gaseous refrigerant circulation port of each first evaporator 5; and each second on-off valve is respectively arranged on each air supply branch pipe and used for controlling the on-off of the air supply branch pipe.
The on-off of each air supply branch pipe can be independently controlled by arranging the second on-off valve on the air supply branch pipe corresponding to each first evaporator 5, and when the first evaporator 5 is in a refrigerating state, the corresponding second on-off valve cuts off the air supply branch pipe; when the first evaporator 5 is in a defrosting state, the corresponding second on-off valve is connected with the air supply branch pipe to supply high-temperature and high-pressure air of the compressor 1 to the first evaporator 5 for defrosting.
Still referring to fig. 1, a drain pipe group is provided between the liquid refrigerant circulation port of each first evaporator 5 and the second evaporator 6, the drain pipe group including: a drain header 30, a plurality of drain branches, and a plurality of third shut-off valves. Wherein, the first end of each liquid discharge branch pipe is communicated with the liquid refrigerant circulation port of the first evaporator 5; the first end of the liquid drain main pipe 30 is communicated with the second end of each liquid drain branch pipe, and the second end of the liquid drain main pipe 30 is communicated with the second evaporator 6; and each third three-way shut-off valve is respectively arranged on each liquid discharge branch pipe and used for controlling the on-off of the liquid discharge branch pipe.
The on-off of each liquid discharge branch pipe can be independently controlled by arranging a third on-off valve on the liquid discharge branch pipe corresponding to each first evaporator 5, and when the first evaporators 5 are in a refrigerating state, the corresponding third on-off valves disconnect the liquid discharge branch pipe; when the first evaporator 5 is in a defrosting state, the corresponding third on-off valve is connected with the liquid discharge branch pipe to discharge the liquid refrigerant generated after the defrosting of the first evaporator 5 to the second evaporator 6.
Still referring to fig. 1, a return air pipe group is provided between the gaseous refrigerant circulation port of each first evaporator 5 and the suction port of the compressor 1, the return air pipe group including: a return manifold 40, a plurality of return branches and a plurality of fourth shut-off valves. One end of each air return branch pipe is communicated with a gaseous refrigerant circulation port of each first evaporator 5, a first end of an air return main pipe is communicated with a second end of each air return branch pipe, and the second end of the air return main pipe is communicated with an air suction port of a compressor; and each fourth shut-off valve is respectively arranged on each air return branch pipe and used for controlling the on-off of the air return branch pipe.
The fourth on-off valves are arranged on the corresponding air return branch pipes of the first evaporators 5, so that the on-off of the air return branch pipes can be independently controlled, and when the first evaporators 5 are in a refrigerating state, the corresponding fourth on-off valves are connected with the air return branch pipes, so that gaseous refrigerants generated by evaporation enter the compressor 1; when the first evaporator 5 is in a defrosting state, the corresponding fourth on-off valve cuts off the air return branch pipe, so that high-temperature and high-pressure air at the exhaust port of the compressor 1 directly enters the first evaporator 5.
Further, as shown in fig. 1, the thermal fluoride frost system of the present application may further comprise: the first expansion valve 77 is arranged on a pipe between the liquid refrigerant flowing port of the first evaporator 5 and the condenser 2, and is used for throttling and reducing the pressure of the liquid refrigerant in the liquid reservoir 3 so as to enter the first evaporator 5 for refrigeration; and/or a second expansion valve 78, which is arranged on a pipe between the liquid refrigerant flowing port of the first evaporator 5 and the liquid refrigerant flowing port of the second evaporator 6, and is used for throttling and depressurizing the liquid refrigerant generated by defrosting the first evaporator 5 so as to enter the second evaporator 6 to convert the liquid refrigerant into a gaseous refrigerant. For example, the first expansion valve 77 and the second expansion valve 78 may detect the refrigerant temperature using a temperature sensor, and adjust the expansion valve opening according to the refrigerant temperature.
Further, as shown in fig. 1, the thermal fluoride frost system of the present application may further comprise: a first check valve 81 provided in a pipe between the condenser 2 and the liquid refrigerant flow port of the first evaporator 5, for allowing the refrigerant to flow unidirectionally from the condenser 2 to the first evaporator 5; a second check valve 82 provided in a pipe between the liquid refrigerant flowing port of the first evaporator 5 and the liquid refrigerant flowing port of the second evaporator 6, for allowing the refrigerant to flow unidirectionally from the first evaporator 5 to the second evaporator 6; a third check valve 83 provided in a pipe between the gaseous refrigerant flow port of the second evaporator 6 and the suction port of the compressor 1, for allowing the refrigerant to flow unidirectionally from the second evaporator 6 to the compressor 1; and/or a fourth check valve 84 provided in a pipe between the discharge port of the compressor 1 and the gaseous refrigerant flow port of the first evaporator 5, for allowing the refrigerant to flow unidirectionally from the compressor 1 to the first evaporator 5.
The arrangement of the one-way valve can improve the safety of refrigerant flow, prevent the refrigerant from flowing reversely and improve the safety of system operation.
The working principle of the thermal frost system according to the present application will be described with reference to fig. 1 by taking two first evaporators 5, namely, a first evaporator a 51 and a first evaporator B52, as an example, provided in a refrigerator.
Three compressors 1 are arranged at the top of the installation frame 1A to form a compressor unit, a liquid reservoir 3 is arranged at the bottom of the installation frame 1A, a condenser 2 can be arranged above the liquid reservoir 3, and an oil-gas separator 4 is arranged at the outlet of the compressor 1 so as to reduce the entering of lubricating oil along with gaseous refrigerant into a refrigeration cycle loop or a defrosting cycle loop and ensure the working lubrication performance of the compressor 1.
Each first evaporator 5 is provided with a liquid supply branch pipe, a gas supply branch pipe and a liquid return branch pipe.
The first end of the liquid supply manifold 10 is communicated with the condenser 2 through the liquid reservoir 3, and two liquid supply branch pipes comprise: the first ends of the first liquid supply branch pipe 11 and the second liquid supply branch pipe 12 are communicated with the second end of the liquid supply main pipe 10, and the second ends of the first liquid supply branch pipe 11 and the second liquid supply branch pipe 12 are respectively communicated with liquid refrigerant circulation ports of the first evaporator A51 and the first evaporator B52. The first liquid supply branch pipe 11 is provided with a first on-off valve A71 for controlling the on-off of the first liquid supply branch pipe 11; the second liquid supply branch pipe 12 is provided with a first on-off valve B72 for controlling the on-off of the second liquid supply branch pipe 12. For example, the on-off valve mentioned here and below may be an electromagnetic on-off valve, a manual on-off valve, or the like.
Further, the first liquid supply branch pipe 11 and the second liquid supply branch pipe 12 may be further provided with a stop valve 84, a first check valve 81, a first expansion valve 77 and/or a filter 86, the stop valve 84 may be configured to cut off a pipeline when the first evaporator 5 is overhauled, and in fig. 1, the stop valve 85, the first check valve 81, the first expansion valve 77, the filter 86 and the first on-off valve 72 are sequentially provided from a position near the first evaporator on the first liquid supply branch pipe 11 and the second liquid supply branch pipe 12.
The first end of the air supply manifold 20 communicates with the air discharge port of the compressor 1, and the two air supply branch pipes include: the first air supply branch pipe 21 and the second air supply branch pipe 22, the first ends of the first air supply branch pipe 21 and the second air supply branch pipe 22 are communicated with the second end of the air supply main pipe 20, and the second ends are respectively communicated with the gaseous refrigerant circulation ports of the first evaporator A51 and the first evaporator B52. The first air supply branch pipe 21 is provided with a second on-off valve A73 for controlling the on-off of the first air supply branch pipe 21; the second air supply branch pipe 22 is provided with a second on-off valve B74 for controlling on-off of the second air supply branch pipe 22. The fourth check valve 84 is provided in the gas supply manifold 20 so that the gaseous refrigerant can flow only from the discharge port of the compressor 1 to the first evaporator 5.
The two liquid discharge branch pipes comprise: a first drain branch pipe 31 and a second drain branch pipe 32, wherein first ends of the first drain branch pipe 31 and the second drain branch pipe 32 are respectively communicated with liquid refrigerant circulation ports of the first evaporator A51 and the first evaporator B52; the first end of the liquid drain manifold 30 is communicated with the second ends of the first liquid drain branch pipe 31 and the second liquid drain branch pipe 32, the second end of the liquid drain manifold 30 is communicated with a liquid refrigerant circulation port of the second evaporator 6, and a gaseous refrigerant circulation port of the second evaporator 6 is communicated with an air suction port of the compressor 1. The first liquid outlet branch pipe 31 is provided with a third on-off valve A75 for controlling the on-off of the first liquid outlet branch pipe 31. A third on-off valve B76 is provided on the second drain branch pipe 32 for controlling on-off of the second drain branch pipe 32. A second check valve 82 may be provided in the first and second branch liquid discharge pipes 31 and 32 to allow the liquid refrigerant to flow only from the first evaporator 5 to the second evaporator 6.
The two return air branch pipes comprise: a first return air branch pipe 41 and a second return air branch pipe 42, wherein first ends of the first return air branch pipe 41 and the second return air branch pipe 42 are respectively communicated with gaseous refrigerant circulation ports of the first evaporator A51 and the first evaporator B52, a first end of a return air main pipe 40 is communicated with second ends of the first return air branch pipe 41 and the second return air branch pipe 42, and a second end of the return air main pipe 40 is communicated with an air suction port of the compressor 1; the first air return branch pipe 41 is provided with a fourth on-off valve A87 for controlling the on-off of the first air return branch pipe 41, and the second air return branch pipe 42 is provided with a fourth on-off valve B88 for controlling the on-off of the second air return branch pipe 42.
The second end of the liquid supply branch pipe is connected to the air return branch pipe between the fourth stop valve and the first evaporator 5; the first end of the liquid discharge branch pipe is connected to the liquid inlet branch pipe between the first evaporator 5 and the first on-off valve, preferably, the liquid discharge branch pipe between the first evaporator 5 and the stop valve 85; the gaseous refrigerant flow port of the second evaporator 6 communicates with the return air header 40.
As shown in fig. 2, when the two first evaporators 5 are in a refrigeration state, the two first on-off valves are all connected with the liquid supply branch pipe, the two fourth on-off valves are all connected with the air return branch pipe, the two second on-off valves are all disconnected with the air supply branch pipe, and the two third on-off valves are all disconnected with the liquid discharge branch pipe.
As shown by thicker refrigerant flow lines in fig. 2, for the first evaporator a 51, the liquid refrigerant in the liquid reservoir 3 enters the first liquid supply branch pipe 11 through the liquid supply header pipe 10, and then enters the first evaporator a 51 to perform evaporation heat exchange to form a gaseous refrigerant; as shown in the finer refrigerant flow lines in fig. 2, the gaseous refrigerant enters the return air manifold 40 through the first return air branch pipe 41, then enters the air suction port of the compressor 1 for compression, and the compressed gas enters the condenser 2 from the air discharge port of the compressor 1 for condensation heat exchange and enters the liquid storage gas 3.
As shown by thicker coolant flow lines in fig. 2, for the first evaporator B52, the liquid coolant in the reservoir 3 passes through the liquid supply header pipe 10, enters the second liquid supply branch pipe 12, and then enters the first evaporator B52 for evaporation heat exchange to form a gaseous coolant; as shown in the finer refrigerant flow lines in fig. 2, the gaseous refrigerant enters the return air manifold 40 through the second return air branch pipe 42, then enters the air suction port of the compressor 1 for compression, and the compressed gas enters the condenser 2 from the air discharge port of the compressor 1 for condensation heat exchange and enters the liquid storage gas 3.
As shown in fig. 3, when the first evaporator a 51 is in the defrosting state and the first evaporator B52 is in the refrigerating state, the first on-off valve a 71 turns off the first liquid supply branch pipe 11, and the second on-off valve B71 turns on the second liquid supply branch pipe 12; the fourth on-off valve A87 turns off the first air return branch pipe 41, and the fourth on-off valve B88 turns on the second air return branch pipe 42; the second on-off valve a 73 turns on the first air supply branch pipe 21, and the second on-off valve B74 turns off the second air supply branch pipe 22; the third on-off valve a 75 turns on the first drain branch pipe 31, and the third on-off valve B76 turns off the second drain branch pipe 32.
The refrigerant flow path of the first evaporator B52 in the cooling state is a thin line in fig. 3, which corresponds to that described in fig. 2.
For the first evaporator a 51 in the defrosting state, the refrigerant flow path is a thicker line in fig. 3, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 sequentially enters the first evaporator B52 for defrosting through the exhaust manifold 20 and the first exhaust branch pipe 21, the liquid refrigerant generated by defrosting sequentially enters the liquid refrigerant flowing port of the second evaporator 6 through the first liquid discharging branch pipe 31 and the liquid discharging manifold 30, and the gaseous refrigerant after evaporation flows out from the gaseous refrigerant flowing port of the second evaporator 6 and returns to the air suction port of the compressor 1 through the air return manifold 40.
The application further provides a refrigerating system, which comprises the thermal fluoride frost system for the refrigerating system.
For example, the refrigeration system includes a refrigeration storage. Because one condenser 2 in the refrigeration house corresponds to a plurality of first evaporators 5, a part of the first evaporators 5 cannot be defrosted in a reversing manner of a four-way valve of the household air conditioner. The thermal fluoride frost system can realize defrosting as required under the condition of saving electric energy.
For the above embodiment, the second evaporator 6 is disposed outside the refrigerator, so as to absorb external heat to convert the liquid refrigerant generated by defrosting the first evaporator 5 into a gaseous refrigerant.
The application further provides a control method of the thermal frost fluoride system based on the heat exchange device, and in some embodiments, the control method comprises the following steps:
in a refrigeration state, a liquid refrigerant circulation port of the first evaporator 5 is communicated with the condenser 2, and a gaseous refrigerant circulation port is communicated with an air suction port of the compressor 1;
in the defrosting state, the liquid refrigerant flowing port of the first evaporator 5 to be defrosted is communicated with the second evaporator 6, and the gaseous refrigerant flowing port is communicated with the exhaust port of the compressor 1.
Further, when the first evaporator 5 to be defrosted is in a defrosting state, it further includes: at least one of the remaining first evaporators 5 is put in a refrigerated state. This makes it possible to defrost the exhaust gas of the compressor 1 when the first evaporator 5 is being operated to cool, thereby making it possible to fully utilize the system energy.
The application provides a thermal fluoride frost system for a refrigerating system, a control method and the refrigerating system. The principles and embodiments of the present application have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present application and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (13)
1. A thermal frost system for a refrigeration system, comprising:
a compressor (1);
a condenser (2);
at least two first evaporators (5), each of which is selectively operable in a refrigeration state or a defrosting state; and
the second evaporator (6) is used for evaporating the liquid refrigerant generated by the first evaporator (5) in the defrosting state into a gaseous refrigerant;
wherein, the liquid refrigerant circulation port of each first evaporator (5) is communicated with the condenser (2) in a refrigeration state and is communicated with the second evaporator (6) in a defrosting state; the gaseous refrigerant circulation port of each first evaporator (5) is communicated with the air suction port of the compressor (1) in a refrigeration state and is communicated with the air discharge port of the compressor (1) in a defrosting state;
wherein, each liquid refrigerant circulation port of the first evaporator (5) and the second evaporator (6) are provided with a liquid discharge pipe group, and the liquid discharge pipe group comprises:
a plurality of drain branch pipes (31; 32), wherein a first end of each drain branch pipe (31; 32) is communicated with a liquid refrigerant circulation port of the first evaporator (5);
-a drain header (30), a first end of the drain header (30) being in communication with a second end of each of the drain branches (31; 32), a second end of the drain header (30) being in communication with the second evaporator (6); and
and a plurality of third cut-off valves (75; 76) respectively arranged on the liquid discharge branch pipes (31; 32) for controlling the on-off of the liquid discharge branch pipes (31; 32).
2. Thermal frosting system for refrigeration systems according to claim 1, characterized in that when one of said first evaporators (5) is in a frosting state, at least one of the remaining first evaporators (5) is in a refrigeration state.
3. A thermal frosting system for refrigeration system according to claim 1, characterized in that between the liquid refrigerant flow port of each first evaporator (5) and the condenser (2) there is a liquid supply tube group comprising:
-a liquid supply manifold (10), a first end of the liquid supply manifold (10) being in communication with the condenser (2);
a plurality of liquid supply branch pipes (11; 12), wherein a first end of each liquid supply branch pipe (11; 12) is communicated with a second end of the liquid supply main pipe (10), and a second end of each liquid supply branch pipe (11; 12) is respectively communicated with a liquid refrigerant circulation port of each first evaporator (5); and
a plurality of first on-off valves (71; 72) are respectively arranged on the liquid supply branch pipes (11; 12) and are used for controlling the on-off of the liquid supply branch pipes (11; 12).
4. Thermal frosting system for refrigeration systems according to claim 1, characterized in that between the gaseous refrigerant flow port of each of said first evaporators (5) and the discharge port of said compressor (1) a group of air supply tubes is provided, comprising:
a gas supply header pipe (20), wherein a first end of the gas supply header pipe (20) is communicated with a gas outlet of the compressor (1);
a plurality of gas supply branch pipes (21; 22), wherein a first end of each gas supply branch pipe (21; 22) is communicated with a second end of the gas supply main pipe (20), and a second end of each gas supply branch pipe (21; 22) is respectively communicated with a gaseous refrigerant circulation port of each first evaporator (5); and
and a plurality of second on-off valves (73; 74) respectively arranged on the air supply branch pipes (21; 22) for controlling the on-off of the air supply branch pipes (21; 22).
5. Thermal frosting system for refrigeration systems according to claim 1, characterized in that in the frosting state the liquid refrigerant flow port of the second evaporator (6) communicates with the liquid refrigerant flow port of the first evaporator (5), and the gaseous refrigerant flow port of the second evaporator (6) communicates with the suction port of the compressor (1).
6. A thermal frosting system for refrigeration system according to claim 1, further comprising a liquid reservoir (3), said liquid reservoir (3) being in communication with the liquid refrigerant flow port of said condenser (2), the liquid refrigerant flow port of each of said first evaporators (5) being in communication with said liquid reservoir (3) in a refrigerated state.
7. The thermal frosting system for a refrigeration system of claim 1, further comprising:
a first expansion valve (77) provided in a pipe between a liquid refrigerant flow port of the first evaporator (5) and the condenser (2); and/or
And a second expansion valve (78) provided in a pipe between the liquid refrigerant flow port of the first evaporator (5) and the liquid refrigerant flow port of the second evaporator (6).
8. The thermal frosting system for a refrigeration system of claim 1, further comprising:
a first check valve (81) provided in a pipe between the condenser (2) and the liquid refrigerant flow port of the first evaporator (5) for allowing the refrigerant to flow unidirectionally from the condenser (2) to the first evaporator (5);
a second check valve (82) provided in a pipe between the liquid refrigerant flow port of the first evaporator (5) and the liquid refrigerant flow port of the second evaporator (6) for unidirectional flow of refrigerant from the first evaporator (5) to the second evaporator (6);
a third check valve (83) provided in a pipe between a gaseous refrigerant flow port of the second evaporator (6) and an intake port of the compressor (1) for unidirectional flow of refrigerant from the second evaporator (6) to the compressor (1); and/or
And a fourth check valve (84) provided in a pipe between the discharge port of the compressor (1) and the gaseous refrigerant flow port of the first evaporator (5) for allowing the refrigerant to flow unidirectionally from the compressor (1) to the first evaporator (5).
9. A refrigeration system comprising a thermal frost-fluoride system for a refrigeration system according to any one of claims 1 to 8.
10. The refrigeration system of claim 9, wherein the refrigeration system comprises a refrigeration house.
11. A refrigeration system according to claim 10, characterized in that the second evaporator (6) is provided outside the freezer.
12. A control method based on the thermal frost system for a refrigeration system according to any one of claims 1 to 8, comprising:
in a refrigeration state, a liquid refrigerant flowing port of the first evaporator (5) is communicated with the condenser (2), and a gaseous refrigerant flowing port is communicated with an air suction port of the compressor (1);
in the defrosting state, a liquid refrigerant flowing port of the first evaporator (5) to be defrosted is communicated with the second evaporator (6), and a gaseous refrigerant flowing port is communicated with an exhaust port of the compressor (1).
13. Control method according to claim 12, characterized in that, when the first evaporator (5) to be defrosted is in a defrosting state, it further comprises:
at least one of the remaining first evaporators (5) is brought into a refrigeration state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910898825.2A CN110500829B (en) | 2019-09-23 | 2019-09-23 | Thermal defrosting system for refrigeration system, control method and refrigeration system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910898825.2A CN110500829B (en) | 2019-09-23 | 2019-09-23 | Thermal defrosting system for refrigeration system, control method and refrigeration system |
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| CN110500829B true CN110500829B (en) | 2023-08-29 |
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| CN104215017A (en) * | 2014-03-06 | 2014-12-17 | 苏州新亚科技有限公司 | Freezer hot fluorine defrosting machine |
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| CN108224828A (en) * | 2018-03-22 | 2018-06-29 | 罗良宜 | A kind of continuous defroster of hot-gas bypass automatic back flow |
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