CN114704981A - Defrosting system and defrosting method of refrigeration appliance - Google Patents
Defrosting system and defrosting method of refrigeration appliance Download PDFInfo
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- CN114704981A CN114704981A CN202210467547.7A CN202210467547A CN114704981A CN 114704981 A CN114704981 A CN 114704981A CN 202210467547 A CN202210467547 A CN 202210467547A CN 114704981 A CN114704981 A CN 114704981A
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- 238000010257 thawing Methods 0.000 title claims abstract description 204
- 238000005057 refrigeration Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005338 heat storage Methods 0.000 claims abstract description 61
- 230000008859 change Effects 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000002528 anti-freeze Effects 0.000 claims description 31
- 239000003507 refrigerant Substances 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 16
- 229910052802 copper Inorganic materials 0.000 claims description 16
- 239000010949 copper Substances 0.000 claims description 16
- 239000011232 storage material Substances 0.000 claims description 10
- 239000002918 waste heat Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims description 2
- 238000007710 freezing Methods 0.000 claims 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 16
- 238000005485 electric heating Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003682 fluorination reaction Methods 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
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- 238000001704 evaporation Methods 0.000 description 2
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- 238000010521 absorption reaction Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 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
- 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
-
- 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
- F25B49/022—Compressor control 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
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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
- 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)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
Abstract
The invention belongs to the technical field of refrigeration, and particularly relates to a defrosting system and a defrosting method of a refrigeration appliance. In the defrosting system, a compressor, a condenser, a throttling device and an evaporator are sequentially connected to form a refrigeration loop, and the compressor and the evaporator are connected to form a main defrosting loop; the defrosting system is provided with an auxiliary defrosting device, wherein the auxiliary defrosting device comprises a phase change heat storage coil, an auxiliary defrosting device and a water pump; the phase change heat storage coil is spirally wound on the shell of the compressor for a plurality of circles, the auxiliary defrosting device is attached to the shell of the evaporator, and the auxiliary defrosting device and the phase change heat storage coil are mutually connected to form an auxiliary defrosting loop; the water pump is arranged on a connecting pipeline between the outlet of the phase change heat storage coil and the inlet of the auxiliary defrosting device; an antifreezing solution is circulated in the auxiliary defrosting loop. The invention solves the problem that the frost layer on the evaporator is difficult to melt at low ambient temperature, improves the defrosting quality and the defrosting efficiency, and is more energy-saving and safer.
Description
Technical Field
The invention belongs to the technical field of refrigeration, and particularly relates to a defrosting system and a defrosting method of a refrigeration appliance.
Background
After the refrigerating system runs for a long time, a frost layer can be formed on the evaporator, the frost layer can reduce the refrigerating effect and increase the energy consumption, and therefore defrosting is needed. At present, the most common forced defrosting mode in a refrigeration system is a thermal fluorination defrosting mode and an electric heating defrosting mode, but the two defrosting modes have defects respectively.
The hot fluorination defrosting mode is that high temperature and high pressure gaseous refrigerant exhausted from the compressor is led into the evaporator and the gaseous refrigerant releases heat in the evaporator to melt the frost layer in the evaporator. However, when the ambient temperature is lower than 18 ℃, the exhaust temperature of the compressor is low, which causes the temperature of the gaseous refrigerant entering the evaporator to be low, and the frost layer on the evaporator cannot be normally melted, which causes the evaporator to be blocked and the air duct to be circulated unsmooth, thereby affecting the refrigeration effect and increasing the load of the compressor; therefore, the pure use of the hot fluorination defrosting mode can prolong the defrosting time, increase the power consumption and influence the service life of the compressor.
The defrosting mode by the electric heating wire is that the evaporator is heated by the electric heating wire to a certain temperature to melt a frost layer, so that the defrosting mode is not influenced by the environmental temperature. However, the application of the defrosting mode of the electric heating wire to flammable and explosive refrigerants has potential safety hazards; in addition, this method may increase power consumption, and the maintenance difficulty of the electric heating wire is large.
Disclosure of Invention
Aiming at the defects in the related art, the invention provides a defrosting system and a defrosting method of a refrigeration appliance, which are used for solving the problem that a frost layer on an evaporator is difficult to dissolve at low ambient temperature and improving the defrosting quality and the defrosting efficiency.
The invention provides a defrosting system of a refrigerating appliance, which comprises a compressor, a condenser, a throttling device, an evaporator and an auxiliary defrosting device, wherein the compressor is connected with the throttling device; wherein,
the compressor, the condenser, the throttling device and the evaporator are sequentially connected to form a refrigeration loop; the compressor is connected with the evaporator to form a main defrosting loop; a condensing fan is arranged at the condenser;
the auxiliary defrosting device comprises a phase change heat storage coil, an auxiliary defrosting device and a water pump; the phase change heat storage coil is spirally wound on the shell of the compressor for a plurality of circles, the auxiliary defrosting device is attached to the shell of the evaporator, and the auxiliary defrosting device and the phase change heat storage coil are mutually connected to form an auxiliary defrosting loop; the water pump is arranged on a connecting pipeline between the outlet of the phase change heat storage coil and the inlet of the auxiliary defrosting device; an antifreezing solution is circulated in the auxiliary defrosting loop.
According to the technical scheme, the auxiliary defrosting device is arranged, so that the problem that a frost layer on the evaporator is difficult to dissolve at low ambient temperature is solved, quick defrosting at low ambient temperature is realized, and defrosting quality and defrosting efficiency are improved; through the setting of phase change heat storage coil pipe, the waste heat of fully absorbing and utilizing the compressor carries out the defrosting, makes the defrosting process have more energy-conservation nature and security.
In some embodiments, the phase change thermal storage coil comprises a copper tube and a tube shell; the tube shell is sleeved outside the copper tube and is connected with the copper tube in a sealing mode, an accommodating cavity is formed between the inner wall of the tube shell and the outer wall of the copper tube, and phase change heat storage materials are filled in the accommodating cavity; the inner cavity of the copper pipe is circulated with antifreeze. According to the technical scheme, the phase-change heat storage material absorbs the waste heat of the compressor so as to heat the antifreeze flowing in the phase-change heat storage coil.
In some of these embodiments, the phase change heat storage material is a paraffin mixture with a melting point of 10 ℃.
In some of these embodiments, a void is left between the turns of the phase change thermal storage coil. According to the technical scheme, the phase change heat storage coil absorbs the waste heat of the compressor, and meanwhile, the phenomenon that the appearance of the phase change heat storage coil excessively shields the compressor to influence the heat dissipation of the compressor is avoided.
In some embodiments, the defrosting system of the refrigeration appliance further comprises a control system, wherein the control system is used for controlling the on-off of the compressor, the condensation fan and the water pump; the control system also comprises an ambient temperature sensor for detecting the ambient temperature, an evaporator temperature sensor for detecting the evaporator temperature and a timer for metering the defrosting time; and the control system is in communication connection with the environment temperature sensor, the evaporator temperature sensor and the timer.
In some embodiments, the outlet of the compressor is connected with a three-way reversing valve, and the three-way reversing valve is used for communicating the outlet of the compressor with the inlet of the condenser to conduct the refrigeration circuit and communicating the outlet of the compressor with the inlet of the evaporator to conduct the main defrosting circuit; the control system controls the conduction direction of the three-way reversing valve.
The invention also provides a defrosting method of the refrigerating appliance, which is carried out by adopting the defrosting system of the refrigerating appliance and comprises the following steps:
when the compressor works, the phase change heat storage coil absorbs the waste heat of the compressor to heat the antifreeze;
when defrosting starts, the main defrosting loop is conducted, and the refrigeration loop is closed; detecting ambient temperature T1And determining the ambient temperature T1Preset temperature T with environmentRThe size of (c):
if T1＞TRThe compressor and the condensing fan are started, and the water pump is closed; executing a main defrosting mode;
if T1≤TRThe compressor and the water pump are started, and the condensing fan is closed; simultaneously executing a main defrosting mode and an auxiliary defrosting mode;
in the defrosting process, the defrosting time S is measured1Detecting the evaporator temperature T2And judging the evaporator temperature T2With evaporator preset temperature TVThe size of (2):
if T is2＞TVClosing the compressor, the condensing fan and the water pump, and ending defrosting;
if T2≤TVFurther judging defrosting time S1And defrosting preset time SnThe size of (2):
if S1＜SnContinuously defrosting;
if S1≥SnAnd closing the compressor, the condensing fan and the water pump, and ending defrosting.
According to the technical scheme, the opening or closing of the compressor, the condensing fan and the water pump is determined according to the ambient temperature, and the corresponding defrosting mode is selected to be executed, so that the problem that a frost layer on the evaporator is difficult to be opened at low ambient temperature is solved, the rapid defrosting at low ambient temperature is realized, and the defrosting quality and the defrosting efficiency are improved; and further, the defrosting finish time is judged according to the conditions of the evaporator temperature and the defrosting time, so that the defrosting process is more energy-saving and consumption-reducing.
In some embodiments, the main defrosting mode is specifically: the high-temperature gaseous refrigerant discharged by the compressor flows into the evaporator, releases heat in the evaporator to melt a frost layer on the evaporator, flows back into the compressor after being cooled, and flows into the evaporator again after being compressed and heated, so that the evaporator is subjected to primary defrosting in a circulating reciprocating manner; the auxiliary defrosting mode specifically comprises the following steps: the water pump pumps the high-temperature antifreeze in the phase-change heat storage coil and pumps the high-temperature antifreeze into the auxiliary defrosting device, the high-temperature antifreeze releases heat in the auxiliary defrosting device to melt a frost layer on the evaporator, the cooled antifreeze flows back into the phase-change heat storage coil, the phase-change heat storage coil releases heat to enable the antifreeze to absorb heat and heat, and the heated high-temperature antifreeze is pumped into the auxiliary defrosting device again to circularly and repeatedly perform auxiliary defrosting on the evaporator.
In some of these embodiments, the ambient preset temperature TRAt 18 deg.C, the evaporator preset temperature TVAt 7 ℃, defrosting for a preset time SnWas 30 minutes.
Based on the technical scheme, the defrosting system and the defrosting method of the refrigeration appliance in the embodiment of the invention solve the problem that a frost layer on the evaporator is difficult to be dissolved at low ambient temperature, realize rapid defrosting at low ambient temperature, improve defrosting quality and defrosting efficiency, and fully utilize the waste heat of the compressor to defrost so that the defrosting process has energy conservation and safety.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a defrosting system of a refrigeration appliance according to the invention;
FIG. 2 is a schematic structural diagram of a phase change thermal storage coil according to the present invention;
fig. 3 is a flow chart of a defrosting method of a refrigeration appliance according to the present invention.
In the figure: 1. a compressor; 2. a condenser; 3. a throttling device; 4. an evaporator; 5. a phase change thermal storage coil; 51. a copper pipe; 52. a pipe shell; 53. a phase change heat storage material; 6. an auxiliary defrosting device; 7. a water pump; 8. a three-way reversing valve; 9. a condensing fan; 10. an evaporation fan.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "inside", "outside", "front", "back", etc., indicate orientations or positional relationships based on those shown in fig. 1, and are used only for convenience of description and simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present invention provides a defrosting system of a refrigeration appliance, which comprises a compressor 1, a condenser 2, a throttling device 3, an evaporator 4 and an auxiliary defrosting device.
The compressor 1, the condenser 2, the throttling device 3 and the evaporator 4 are sequentially connected through pipelines to form a refrigeration loop; refrigerant circulates in the refrigeration circuit. The condenser 2 is provided with a condensing fan 9 for enhancing the heat exchange of the condenser 2 and dissipating heat of the compressor 1. An evaporation fan 10 is arranged at the evaporator 4 and used for enhancing the heat exchange of the evaporator 4. It will be understood that the inlet of the compressor 1 communicates with the outlet of the evaporator 4, the outlet of the compressor 1 communicates with the inlet of the condenser 2, the inlet of the throttling means 3 communicates with the outlet of the condenser 2 and the outlet of the throttling means 3 communicates with the inlet of the evaporator 4.
Referring to the flow direction indicated by the solid arrow in fig. 1, the refrigeration process specifically includes: the low-temperature low-pressure gaseous refrigerant flowing out of the evaporator 4 enters the compressor 1 and is compressed into a high-temperature high-pressure gaseous refrigerant; the high-temperature high-pressure gas refrigerant is discharged from the outlet of the compressor 1 and then enters the condenser 2 to be condensed into a high-pressure liquid refrigerant; the high-pressure liquid refrigerant flows out of the condenser 2 and then passes through the throttling device 3 to be throttled into a low-pressure low-temperature liquid refrigerant; the low-pressure low-temperature liquid refrigerant enters the evaporator 4 to undergo phase change heat absorption and then is phase-changed into a low-pressure low-temperature gaseous refrigerant; the low-pressure low-temperature gaseous refrigerant enters the compressor 1, whereby refrigeration is achieved.
The compressor 1 and the evaporator 4 are connected to form a main defrosting loop. Specifically, the outlet of the compressor 1 also communicates with the inlet of the evaporator 4. Referring to the flow direction indicated by the dotted line arrow in fig. 1, the main defrosting process specifically includes: the high-temperature gaseous refrigerant in the compressor 1 flows out of the compressor 1 through the outlet of the compressor 1 and flows into the evaporator 4 through the inlet of the evaporator 4, the heat of the high-temperature gaseous refrigerant is released in the evaporator 4 to melt the frost layer on the evaporator 4, and the cooled low-temperature gaseous refrigerant flows out of the evaporator 4 through the outlet of the evaporator 4 and flows back into the compressor 1 through the inlet of the compressor 1, so that the main defrosting is realized.
The auxiliary defrosting device comprises a phase change heat storage coil 5, an auxiliary defrosting device 6 and a water pump 7. The phase change heat storage coil 5 is spirally wound on the shell of the compressor 1 for a plurality of circles, the auxiliary defrosting device 6 is attached to the shell of the evaporator 4, and the auxiliary defrosting device 6 and the phase change heat storage coil 5 are connected with each other through a pipeline to form an auxiliary defrosting loop. Specifically, an inlet of the auxiliary defroster 6 is communicated with an outlet of the phase change heat storage coil 5, and an outlet of the auxiliary defroster 6 is communicated with an inlet of the phase change heat storage coil 5. The water pump 7 is arranged on a connecting pipeline between the outlet of the phase change heat storage coil 5 and the inlet of the auxiliary defroster 6. An antifreezing solution is circulated in the auxiliary defrosting loop in a circulating manner, and the antifreezing solution is a glycol aqueous solution. It should be noted that, in the refrigeration process and the main defrosting process, that is, in the working process of the compressor 1, the phase-change heat storage coil 5 absorbs the residual heat of the compressor 1 and accumulates heat to heat the antifreeze flowing in the phase-change heat storage coil 5. In addition, the phase change heat storage coil 5 is coiled and manufactured by matching the shape of the compressor 1, so that the matching degree between the phase change heat storage coil 5 and the compressor 1 is higher, the phase change heat storage coil 5 absorbs heat more sufficiently, the cost of a mold is saved, and the use is convenient and rapid.
Referring to the flow direction indicated by the dotted arrow in fig. 1, the auxiliary defrosting process specifically includes: after the water pump 7 is started, the high-temperature antifreeze solution in the phase-change heat storage coil 5 is extracted and pumped into the auxiliary defrosting device 6 at the evaporator 4, the high-temperature antifreeze solution releases heat in the auxiliary defrosting device 6 to melt a frost layer on the evaporator 4, the cooled low-temperature antifreeze solution flows back into the phase-change heat storage coil 5, the phase-change heat storage coil 5 releases heat to absorb heat of the antifreeze solution and raise the temperature, and the heated high-temperature antifreeze solution is pumped into the auxiliary defrosting device 6 again to achieve auxiliary defrosting.
In the above illustrative embodiment, by setting the auxiliary defrosting device, the problem that the frost layer on the evaporator 4 is difficult to melt at low ambient temperature is solved, rapid defrosting at low ambient temperature is realized, and defrosting quality and defrosting efficiency are improved; through the arrangement of the phase change heat storage coil pipe 5, the waste heat of the compressor 1 is fully absorbed and utilized for defrosting, so that the defrosting process has more energy-saving property and safety.
As shown in fig. 2, in some embodiments, the phase change thermal storage coil 5 includes a copper tube 51 and a tube shell 52. The tube shell 52 is sleeved outside the copper tube 51 and is connected with the copper tube 51 in a sealing mode, an accommodating cavity is formed between the inner wall of the tube shell 52 and the outer wall of the copper tube 51, and the accommodating cavity is filled with the phase change heat storage material 53. The inner cavity of the copper tube 51 is filled with an antifreeze. In the exemplary embodiment, the phase change heat storage material 53 absorbs the residual heat of the compressor 1 to heat the antifreeze flowing through the phase change heat storage coil 5.
In some embodiments, the phase change heat storage material 53 is a paraffin mixture having a melting point of 10 ℃. The phase change heat storage material 53 in the exemplary embodiment can store a large amount of heat by absorbing and releasing heat using latent heat.
As shown in fig. 1, in some embodiments, there is a gap between the turns of the phase change thermal storage coil 5, i.e., the phase change thermal storage coil 5 is wound around the housing of the compressor 1. This exemplary embodiment, on the one hand make phase change heat storage coil 5 can fully absorb the waste heat of compressor 1, on the other hand avoids excessively sheltering from compressor 1 because of the appearance of phase change heat storage coil 5 and influences the radiating effect of condensing fan 9 to compressor 1.
In some embodiments, the defrosting system of the refrigeration appliance further comprises a control system, wherein the control system is used for controlling the on-off of the compressor 1, the condensing fan 9 and the water pump 7; the control system also comprises an ambient temperature sensor for detecting the ambient temperature, an evaporator 4 temperature sensor for detecting the temperature of the evaporator 4 and a timer for metering the defrosting time; the control system is in communication connection with the ambient temperature sensor, the evaporator 4 temperature sensor and the timer. According to the illustrative embodiment, through the setting of the control system, the automatic control of the defrosting process is realized, and the defrosting is more thorough and rapid.
In some embodiments, as shown in fig. 1, a three-way reversing valve 8 is connected to the outlet of the compressor 1 for communicating the outlet of the compressor 1 with the inlet of the condenser 2 to conduct the refrigeration circuit and communicating the outlet of the compressor 1 with the inlet of the evaporator 4 to conduct the main defrosting circuit. The control system controls the conducting direction of the three-way reversing valve 8. According to the illustrative embodiment, the refrigeration loop and the main defrosting loop are switched by arranging the three-way reversing valve 8.
As shown in fig. 3 and referring to fig. 1, the invention further provides a defrosting method of a refrigeration appliance, which is performed by using the defrosting system of the refrigeration appliance, and comprises the following steps:
when the compressor 1 works, the phase-change heat storage coil 5 absorbs the waste heat of the compressor 1 to heat the antifreeze flowing in the phase-change heat storage coil 5;
when defrosting starts, the main defrosting loop is conducted, and the refrigerating loop is closed; detecting the ambient temperature T1And determining the ambient temperature T1With the ambient preset temperature TRThe size of (2):
if T1＞TRThe compressor 1 and the condensing fan 9 are started, and the water pump 7 is closed; executing a main defrosting mode;
if T1≤TRThe compressor 1 and the water pump 7 are started, and the condensing fan 9 is closed; simultaneously executing a main defrosting mode and an auxiliary defrosting mode;
in the defrosting process, the defrosting time S is measured1Detecting the temperature T of the evaporator 42And judging the temperature T of the evaporator 42At a predetermined temperature T with respect to the evaporator 4VThe size of (c):
if T is2＞TVClosing the compressor 1, the condensing fan 9 and the water pump 7, and ending defrosting;
if T2≤TVFurther judging defrosting time S1And defrosting preset time SnThe size of (2):
if S1＜SnContinuously defrosting;
if S1≥SnAnd closing the compressor 1, the condensing fan 9 and the water pump 7, and ending defrosting.
In the above illustrative embodiment, the opening or closing of the compressor 1, the condensing fan 9 and the water pump 7 is determined according to the ambient temperature, the condensing fan 9 is opened when the ambient temperature is high so as to facilitate heat dissipation of the compressor 1, the condensing fan 9 is independently closed when the ambient temperature is low so as to achieve energy saving and consumption reduction, and meanwhile, a corresponding defrosting mode is selected to be executed according to the ambient temperature, so that the defrosting process is more economical and energy-saving; in addition, at a low ambient temperature, the problem that a frost layer on the evaporator 4 is difficult to melt at the low ambient temperature is solved by simultaneously executing the main defrosting mode and the auxiliary defrosting mode, so that rapid defrosting at the low ambient temperature is realized, and defrosting quality and defrosting efficiency are improved; and further, the defrosting finish time is judged according to the temperature of the evaporator 4 and the defrosting time, so that the defrosting process is more energy-saving.
In some embodiments, the main defrosting mode is specifically: the high-temperature gaseous refrigerant discharged from the compressor 1 flows into the evaporator 4, releases heat in the evaporator 4 to melt the frost layer on the evaporator 4, and the cooled gaseous refrigerant flows back into the compressor 1, is compressed and heated and then flows into the evaporator 4 again, so that the circulation is repeated to perform main defrosting on the evaporator 4. The auxiliary defrosting mode specifically comprises the following steps: the water pump 7 pumps the high-temperature antifreeze solution in the phase-change heat storage coil 5 and pumps the antifreeze solution into the auxiliary defroster 6, the high-temperature antifreeze solution releases heat in the auxiliary defroster 6 to melt a frost layer on the evaporator 4, the cooled antifreeze solution flows back into the phase-change heat storage coil 5, the phase-change heat storage coil 5 releases heat to absorb heat of the antifreeze solution and raise the temperature, and the heated high-temperature antifreeze solution is pumped into the auxiliary defroster 6 again to circularly and repeatedly perform auxiliary defrosting on the evaporator 4.
In some embodiments, the ambient preset temperature TRAt 18 ℃ and a preset temperature T of the evaporator 4VAt 7 ℃, defrosting for a preset time SnWas 30 minutes. According to the illustrative embodiment, the optimal numerical value of each parameter preset index in the defrosting method is determined.
Through the description of the multiple embodiments of the defrosting system and the defrosting method of the refrigeration appliance, the invention can be seen to have at least one or more of the following advantages:
1) by additionally arranging the auxiliary defrosting device, when defrosting is carried out at low ambient temperature, the main defrosting mode and the auxiliary defrosting mode are simultaneously executed, so that the problem that a frost layer on the evaporator 4 is difficult to open at low ambient temperature is solved, rapid defrosting at low ambient temperature is realized, and defrosting quality and defrosting efficiency are improved;
2) by winding the phase change heat storage coil 5 on the shell of the compressor 1 in a staggered manner and enabling the phase change heat storage coil 5 to be flexibly matched with the shape of the compressor 1, on one hand, the waste heat of the compressor 1 can be fully absorbed and utilized for defrosting, and the defrosting process has more energy-saving property and safety; on the other hand, the heat radiation effect of the condensing fan 9 on the compressor 1 is prevented from being influenced because the appearance of the phase change heat storage coil 5 excessively shields the compressor 1.
Finally, it should be noted that: the embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (9)
1. The defrosting system of the refrigeration appliance is characterized by comprising a compressor, a condenser, a throttling device, an evaporator and an auxiliary defrosting device; wherein,
the compressor, the condenser, the throttling device and the evaporator are sequentially connected to form a refrigeration loop; the compressor is connected with the evaporator to form a main defrosting loop; a condensing fan is arranged at the condenser;
the auxiliary defrosting device comprises a phase change heat storage coil, an auxiliary defrosting device and a water pump; the phase-change heat storage coil is spirally wound on the shell of the compressor for multiple circles, the auxiliary defrosting device is attached to the shell of the evaporator, and the auxiliary defrosting device and the phase-change heat storage coil are mutually connected to form an auxiliary defrosting loop; the water pump is arranged on a connecting pipeline between the outlet of the phase change heat storage coil and the inlet of the auxiliary defrosting device; and an anti-freezing solution is circulated in the auxiliary defrosting loop.
2. The defrosting system of a refrigeration appliance according to claim 1 wherein the phase change heat storage coil comprises a copper tube and a tube shell; the tube shell is sleeved outside the copper tube and is connected with the copper tube in a sealing mode, an accommodating cavity is formed between the inner wall of the tube shell and the outer wall of the copper tube, and phase change heat storage materials are filled in the accommodating cavity; and an anti-freezing solution flows through the inner cavity of the copper pipe.
3. The defrosting system of a refrigerator appliance according to claim 2, wherein the phase-change heat storage material is a paraffin mixture having a melting point of 10 ℃.
4. The defrosting system of a refrigerator appliance of claim 1 wherein a void is left between the turns of the phase change thermal storage coil.
5. The defrosting system of a refrigeration appliance according to claim 1 further comprising a control system for controlling the on and off of the compressor, the condensing fan and the water pump; the control system also comprises an ambient temperature sensor for detecting the ambient temperature, an evaporator temperature sensor for detecting the evaporator temperature and a timer for metering the defrosting time; and the control system is in communication connection with the environment temperature sensor, the evaporator temperature sensor and the timer.
6. The defrosting system of a refrigerating appliance according to claim 5, wherein a three-way reversing valve is connected to the outlet of the compressor for connecting the outlet of the compressor to the inlet of the condenser to conduct the refrigerating circuit and connecting the outlet of the compressor to the inlet of the evaporator to conduct the main defrosting circuit; and the control system controls the conduction direction of the three-way reversing valve.
7. A defrosting method of a refrigerating appliance, which is carried out by using the defrosting system of the refrigerating appliance as claimed in any one of claims 1 to 6, and comprises the following steps:
when the compressor works, the phase-change heat storage coil absorbs the waste heat of the compressor so as to heat the antifreeze;
when defrosting is started, the main defrosting loop is conducted, and the refrigeration loop is closed; detecting ambient temperature T1And judging the ambient temperature T1Preset temperature T with environmentRThe size of (2):
if T1＞TRThe compressor and the condensing fan are started, and the water pump is closed; executing a main defrosting mode;
if T1≤TRThe compressor and the water pump are started, and the condensing fan is closed; simultaneously executing a main defrosting mode and an auxiliary defrosting mode;
in the defrosting process, the defrosting time S is measured1Detecting the evaporator temperature T2And judging the evaporator temperature T2With evaporator preset temperature TVThe size of (2):
if T2＞TVClosing the compressor, the condensing fan and the water pump, and ending defrosting;
if T2≤TVFurther judging defrosting time S1And defrosting preset time SnThe size of (2):
if S1＜SnContinuously defrosting;
if S1≥SnAnd closing the compressor, the condensing fan and the water pump, and ending defrosting.
8. The defrosting method of a refrigerator appliance according to claim 7,
the main defrosting mode specifically comprises the following steps: the high-temperature gaseous refrigerant discharged by the compressor flows into the evaporator, releases heat in the evaporator to melt a frost layer on the evaporator, flows back into the compressor after temperature reduction, and flows into the evaporator again after compression and temperature rise so as to circularly and repeatedly carry out primary defrosting on the evaporator;
the auxiliary defrosting mode specifically comprises the following steps: the water pump pumps the high-temperature antifreeze in the phase-change heat storage coil and pumps the high-temperature antifreeze into the auxiliary defrosting device, the high-temperature antifreeze releases heat in the auxiliary defrosting device to melt a frost layer on the evaporator, the cooled antifreeze flows back into the phase-change heat storage coil, the phase-change heat storage coil releases heat to enable the antifreeze to absorb heat and heat, and the heated high-temperature antifreeze is pumped into the auxiliary defrosting device again to circularly and repeatedly perform auxiliary defrosting on the evaporator.
9. Method for defrosting a refrigeration appliance according to claim 7, characterized in that said ambient preset temperature TRAt 18 ℃, the evaporator preset temperature TVAt 7 ℃, the defrosting is carried out for a preset time SnWas 30 minutes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031487A (en) * | 2024-04-15 | 2024-05-14 | 上海东方低碳科技产业股份有限公司 | Energy-saving refrigeration equipment with self-adaptive function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823269A (en) * | 2016-03-21 | 2016-08-03 | 广东美的暖通设备有限公司 | Heat pump system |
| CN105890269A (en) * | 2016-04-15 | 2016-08-24 | 合肥华凌股份有限公司 | Circulating defrosting system, refrigerator and defrosting method |
| CN205980535U (en) * | 2016-08-15 | 2017-02-22 | 合肥华凌股份有限公司 | White system of heat accumulationization and refrigerator of refrigerator |
| CN114234519A (en) * | 2021-12-20 | 2022-03-25 | 海信（山东）冰箱有限公司 | A kind of refrigerator |
-
2022
- 2022-04-29 CN CN202210467547.7A patent/CN114704981B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823269A (en) * | 2016-03-21 | 2016-08-03 | 广东美的暖通设备有限公司 | Heat pump system |
| CN105890269A (en) * | 2016-04-15 | 2016-08-24 | 合肥华凌股份有限公司 | Circulating defrosting system, refrigerator and defrosting method |
| CN205980535U (en) * | 2016-08-15 | 2017-02-22 | 合肥华凌股份有限公司 | White system of heat accumulationization and refrigerator of refrigerator |
| CN114234519A (en) * | 2021-12-20 | 2022-03-25 | 海信（山东）冰箱有限公司 | A kind of refrigerator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031487A (en) * | 2024-04-15 | 2024-05-14 | 上海东方低碳科技产业股份有限公司 | Energy-saving refrigeration equipment with self-adaptive function |
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