CN114485012A - Electromagnetic heating sublimation defrosting device, defrosting control method, refrigeration system and equipment - Google Patents
Electromagnetic heating sublimation defrosting device, defrosting control method, refrigeration system and equipment Download PDFInfo
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- CN114485012A CN114485012A CN202210048386.8A CN202210048386A CN114485012A CN 114485012 A CN114485012 A CN 114485012A CN 202210048386 A CN202210048386 A CN 202210048386A CN 114485012 A CN114485012 A CN 114485012A
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- 238000010257 thawing Methods 0.000 title claims abstract description 235
- 238000005057 refrigeration Methods 0.000 title claims abstract description 65
- 238000000859 sublimation Methods 0.000 title claims abstract description 36
- 230000008022 sublimation Effects 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002441 reversible effect Effects 0.000 claims abstract description 27
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 230000005389 magnetism Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000001816 cooling Methods 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 7
- 239000003507 refrigerant Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 239000003570 air Substances 0.000 description 169
- 238000005192 partition Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009920 food preservation Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000005092 sublimation method Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- 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
- F25D21/08—Removing frost by electric heating
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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
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
-
- 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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/067—Evaporator fan units
-
- 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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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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 discloses an electromagnetic heating sublimation defrosting device, a defrosting control method, a refrigeration system and equipment, wherein the electromagnetic heating sublimation defrosting device comprises: the evaporator assembly is arranged in the refrigerating system and is provided with at least two evaporators arranged in parallel; be equipped with the baffle between two adjacent evaporimeters, the baffle separates into independent cavity with the region of evaporimeter place, and the evaporimeter surface is provided with the hot coating of magnetism, installs solenoid in the independent cavity, provides alternating magnetic field for the hot coating of magnetism when solenoid circular telegram, and independent cavity is equipped with the electromagnetic shield layer that is used for blockking the alternating magnetic field and leaks. Each evaporator is provided with a forward and reverse rotating fan, and when the fan for starting the defrosting evaporator rotates reversely, part of airflow sent by the refrigerating evaporator enters an independent cavity where the defrosting evaporator is located. The invention has the advantages of high defrosting efficiency, low influence on a refrigerating system, more energy saving, small temperature fluctuation of the room temperature, no complex pipeline connection and the like, and is suitable for being applied to refrigerating equipment such as a refrigerator and the like.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to an electromagnetic heating sublimation defrosting device, a defrosting control method, a refrigeration system and equipment.
Background
With the increasing standard of living, the refrigeration equipment is gradually applied in daily life, such as refrigerator, and the refrigeration system of the refrigerator is mainly divided into four parts: the air conditioner comprises an evaporator, a condenser, a compressor and a throttling device, wherein the evaporator is a device for providing cold energy, and a refrigerant absorbs heat in the evaporator and evaporates to reduce the air temperature. Since the evaporator temperature is lower than the air dew point temperature, moisture in the air is continuously condensed into frost on the evaporator. When the amount of frost increases, the heat transfer efficiency of the evaporator deteriorates, the refrigeration effect deteriorates, and the energy consumption increases.
The traditional refrigerator adopts a single evaporator, so that the compressor needs to be stopped during defrosting, the temperature rise of the room is high, and the food storage is not favorable. In addition, most of the refrigerators in the market at present are air-cooled refrigerators, and although the air-cooled refrigerators have an automatic defrosting function, most of the air-cooled refrigerators adopt an electric heating defrosting mode, wherein an electric heating pipe is arranged below an evaporator, and a frost layer is heated in an air heating mode. Because the defrosting mode is to heat the frost layer by the natural convection of air, the defrosting efficiency is low and the defrosting time is long.
The defrosting mode capable of improving the defrosting efficiency has appeared in the prior art, the electric heating net is used for providing heat for sublimation defrosting, and the vibration defrosting mode is combined to shake off a loose frost layer on the evaporator, but the vibration defrosting mode can influence the stability of an evaporator pipeline interface, and the resonance phenomenon can occur, so that the reliability of a refrigeration system is reduced.
The prior art also has a defrosting mode of heating by hot gas, and the defrosting evaporator is heated and defrosted by introducing a high-temperature refrigerant into the defrosting evaporator by using a pipeline, but the defrosting mode can increase pipeline connection, so that the pipeline arrangement of a mechanical chamber of the refrigeration equipment is complex, and the installation and maintenance are not facilitated.
Disclosure of Invention
In order to solve the problems of low defrosting speed and low efficiency in the conventional defrosting mode, the invention provides an electromagnetic heating sublimation defrosting device, a defrosting control method, a refrigerating system and equipment.
The technical scheme adopted by the invention is that the electromagnetic heating sublimation defrosting device is designed, and comprises: the evaporator assembly is arranged in the refrigerating system and is provided with at least two evaporators arranged in parallel; be equipped with the baffle between two adjacent evaporimeters, the baffle becomes independent cavity with the regional division of evaporimeter place, and the evaporimeter surface is provided with the hot coating of magnetism that is used for providing the frost layer sublimation heat, installs solenoid in the independent cavity, provides alternating magnetic field for the hot coating of magnetism when solenoid circular telegram, and independent cavity is equipped with the electromagnetic shield layer that is used for blockking the alternating magnetic field and leaks.
Furthermore, after any evaporator in the evaporator assembly enters a defrosting mode to serve as a defrosting evaporator, at least one evaporator in the rest of evaporators enters a refrigerating mode to serve as a refrigerating evaporator; each evaporator is provided with a forward and reverse rotating fan, and when the fan for starting the defrosting evaporator rotates reversely, part of airflow sent by the refrigerating evaporator enters an independent cavity where the defrosting evaporator is located.
Furthermore, each independent cavity is provided with an air supply air inlet, an air supply air outlet and a defrosting air outlet, an air supply air channel is formed between the air supply air inlet and the air supply air outlet, a defrosting air channel is formed between the air supply air outlet and the defrosting air outlet, and the on-off states of the air supply air channel and the defrosting air channel are adjusted through valves.
Furthermore, the air supply air inlet, the air supply air outlet and the defrosting air outlet are all provided with valves, all the valves can be automatically reset and closed, and the valves of the air supply air outlet are provided with drainage holes. When the fan of the evaporator rotates forwards, the valve of the air supply inlet and the valve of the air supply outlet are blown open; when the fan of the evaporator rotates reversely, the valve of the defrosting air outlet is blown open, and the airflow enters the independent chamber from the drainage hole.
Furthermore, the defrosting air outlet is formed in the bottom of the independent cavity, a water collecting tray is arranged below the defrosting air outlet, and the water collecting tray is used for receiving liquid and/or frost layers falling from the defrosting air outlet. The appearance of water collector is the infundibulate, and the top of water collector is equipped with the uncovered that is located all defrosting air outlets below, and the bottom of water collector is equipped with the size and is less than open outlet, and the below of outlet is equipped with the water collector.
Further, electromagnetic heating sublimation defroster still includes: the detection module is used for detecting the operating parameters of the evaporator, and the controller adjusts the operating state of the evaporator and/or the electromagnetic coil according to the operating parameters of the evaporator.
The detection module comprises at least one of a wind speed sensor, a temperature sensor and a timer; the air speed sensor is used for detecting the air speed of the corresponding air outlet after a fan of the evaporator is started, the temperature sensor is used for detecting the surface temperature T1 of the evaporator after the evaporator enters a defrosting mode, and the timer is used for starting timing the defrosting time T1 when the electromagnetic coil is electrified and/or starting timing the reverse rotation time T2 when the fan of the evaporator is started and reversed.
The invention also provides a defrosting control method realized by the electromagnetic heating sublimation defrosting device, which comprises the following steps:
starting any evaporator to enter a refrigeration mode to serve as a refrigeration evaporator, and judging whether the refrigeration evaporator meets defrosting conditions in real time;
and if so, controlling the refrigeration evaporator to enter a defrosting mode to serve as the defrosting evaporator, and electrifying an electromagnetic coil of the defrosting evaporator to heat the magnetic thermal coating on the surface of the defrosting evaporator.
Wherein, judge in real time whether refrigeration evaporator satisfies the defrosting condition and include:
detecting the air supply and air outlet speed V1 of the refrigeration evaporator;
judging whether the air supply and air outlet speed V1 is less than a first set air speed V01;
if yes, the defrosting condition is met;
if not, the wind speed V1 is detected in a returning mode.
Further, energizing a solenoid of the defrost evaporator comprises:
selecting a working gear of the electromagnetic coil according to a difference value between the air supply and air outlet speed V1 and a first set air speed V01;
when | V1-V01| < the setting deviation and V1-V01<0, the electromagnetic coil is electrified according to the first working gear E1;
when | V1-V01| ≧ set deviation and V1-V01<0, the solenoid is energized in second operating position E2.
The current of the first operating position E1 is smaller than the current of the second operating position E2.
Further, the defrosting control method further includes:
controlling at least one of the remaining evaporators to enter a refrigeration mode as a refrigeration evaporator after controlling the refrigeration evaporator to enter the defrosting mode as the defrosting evaporator;
starting to count the defrosting time T1 when the electromagnetic coil is electrified;
detecting the surface temperature T1 and the defrosting time T1 of the defrosting evaporator;
judging whether the surface temperature T1 is greater than the set temperature T01 or whether the defrosting time T1 is greater than a first set time T01;
if so, starting a fan of the defrosting evaporator to reversely rotate;
if not, the detection surface temperature T1 and the defrosting time T1 are returned.
Further, the defrosting control method further includes:
starting to count reverse time T2 when a fan of the defrosting evaporator is started to reversely rotate;
detecting a defrosting air outlet speed V2 and a reverse rotation time T2 of the defrosting evaporator;
judging whether the defrosting air outlet speed V2 is greater than a second set air speed V02 or whether the reverse rotation time T2 is greater than a second set time T02;
if so, the defrosting evaporator exits the defrosting mode, and an electromagnetic coil and a fan of the defrosting evaporator are closed;
if not, the defrosting air outlet speed V2 and the reverse rotation time T2 are detected.
The invention also provides a refrigeration system adopting the electromagnetic heating sublimation defrosting device, which comprises: the compressor, the condenser, the throttling device and the evaporator assembly are connected in sequence. In some embodiments, the evaporator assembly has two evaporators, and the throttling device is connected to the evaporator assembly by a three-way valve, and the three-way valve can be switched to connect the throttling device to any one evaporator in the evaporator assembly.
The invention also provides refrigeration equipment with the refrigeration system, and the refrigeration equipment can be products such as a refrigerator and the like.
Compared with the prior art, the invention has the following beneficial effects:
1. after the evaporator enters a defrosting mode, an electromagnetic coil of the defrosting evaporator is electrified, and a magneto-caloric coating on the surface of the evaporator generates heat due to a cutting magnetic field and is heated by direct contact from the surface of the evaporator, so that the temperature of the defrosting evaporator slightly rises, the heat generated by the cutting magnetic field is short in time consumption, high in speed and large in heat, and compared with electric heating defrosting, the defrosting is more energy-saving, and compared with refrigerant bypass defrosting, the heating is more uniform;
2. in the defrosting process, a fan of the defrosting evaporator is started to rotate reversely, partial airflow flowing out of the refrigerating evaporator is led into an independent cavity where the defrosting evaporator is located, low-humidity air is continuously provided for the defrosting evaporator, the humidity increase caused by sublimation of a frost layer is avoided, and the maximum humidity difference is continuously provided so as to maintain the maximum speed of sublimation of the frost layer;
3. the compressor does not need to be stopped in the defrosting process, so that the frequency of frequently starting and stopping the compressor is reduced, the service life of the compressor is prolonged, and the operation reliability of a refrigerating system is improved;
4. the area where the evaporator is located is separated by the partition board, the air supply of the refrigeration evaporator is not interfered by the defrosting evaporator, the air volume introduced when the defrosting evaporator rotates reversely is small, the temperature of the compartment of refrigeration equipment such as a refrigerator is basically unchanged, and the food preservation effect is good;
5. the gear of the electromagnetic coil is adjusted according to the actual frosting condition, the electrifying time is short, the defrosting efficiency is high, and more energy is saved.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of a dual evaporator refrigeration system of the present invention;
FIG. 2 is a schematic view of the valves of the defrosting evaporator of the present invention with the fan reversed;
FIG. 3 is a schematic view of the valves at the end of defrosting of the defrosting evaporator of the present invention;
FIG. 4 is a schematic flow diagram of the defrost control method of the present invention;
FIG. 5 is a schematic diagram of the defrost flow for the dual evaporator of the present invention;
wherein, 1, a compressor; 2, a condenser; 3, a throttle valve; 4 a first evaporator; 5 a second evaporator; 6 electromagnetic three-way valve; 7, a one-way valve; 8 a first electromagnetic coil; 9 a second electromagnetic coil; 10 a first fan; 11 a second fan; 12, a water pan; 13, a water receiving box; 14 a partition plate; 15 a first air supply and outlet valve; 16 a second air supply and outlet valve; 17 a first air supply air inlet valve; 18 a second air supply air inlet valve; 19 a first defrosting air outlet valve; 20 a second defrosting air outlet valve; 21 an electromagnetic shielding layer; 22 magnetocaloric coating.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention provides an electromagnetic heating sublimation defrosting device suitable for a refrigeration system, the refrigeration system mainly includes four parts, which are a compressor 1, a condenser 2, a throttling device 3 and an evaporator assembly, which are connected in sequence, a refrigerant is discharged from an exhaust port of the compressor 1 during refrigeration, and flows back to an air suction port of the compressor 1 after passing through the condenser 2, the throttling device 3 and the evaporator assembly, the electromagnetic heating sublimation defrosting device is an improved scheme provided for the evaporator assembly, and the specific structure is as follows.
Electromagnetic heating sublimation defroster includes: an evaporator assembly arranged in a refrigeration system, the evaporator assembly is provided with at least two evaporators arranged in parallel, a check valve 7 only allowing a refrigerant to flow out is arranged at an outlet of each evaporator, each evaporator in the evaporator assembly is arranged in a separated mode, two adjacent evaporators are separated by a partition plate 14, an area where the evaporator is located is separated into independent chambers by the partition plate 14, a magnetocaloric coating 22 is arranged on the surface of each evaporator, magnetocaloric materials such as iron and nickel are contained in the magnetocaloric coating 22, an electromagnetic coil for providing an alternating magnetic field for the magnetocaloric coating 22 when the electromagnetic coil is electrified is arranged in each independent chamber where the evaporators are located, after the evaporators enter a defrosting mode, power is supplied to the electromagnetic coil to provide heat for the defrosting evaporators so that frost layers attached to the surfaces of the evaporators are sublimated, and the sublimated frost layers only account for a small part compared with frost layers condensed on the whole defrosting evaporators, so that the heating amount required by the sublimation process of the defrosting evaporators is not large, the electromagnetic coil has short electrifying time, low energy consumption and obvious energy-saving effect.
The independent chamber is provided with an electromagnetic shielding layer 21 surrounding the evaporator, the shielding material uses a copper mesh with the mesh size of more than 100, of course, the electromagnetic shielding layer 21 can be metal such as a copper plate or an aluminum plate, electromagnetic coils are separated through the electromagnetic shielding layer 21, the mutual interference condition is reduced, and the air supply of the refrigeration evaporator is not influenced by the defrosting evaporator. The electromagnetic shielding layer 21 may be designed on the surface of a separate chamber or embedded in a separate chamber, and the partition 14 separates two adjacent evaporators, so that the electromagnetic shielding layer 21 can be embedded in the partition, and the two evaporators share one partition 14.
In one embodiment of the present invention, after any one evaporator in the evaporator assembly enters the defrosting mode, at least one of the remaining evaporators enters the cooling mode, in order to distinguish the evaporators in different operating modes, the evaporator entering the defrosting mode is called a defrosting evaporator, the evaporator entering the cooling mode is called a cooling evaporator, and the evaporator adjacent to the defrosting evaporator is preferentially selected to perform the cooling mode, so that a humidity difference is generated between the defrosting evaporator and the cooling evaporator. The compressor 1 does not need to be stopped in the defrosting process, the frequency of frequently starting and stopping the compressor 1 is reduced, the service life of the compressor is prolonged, the operation reliability of a refrigerating system is improved, and the temperature of a compartment is not influenced in the defrosting process.
In order to improve the defrosting efficiency, in another embodiment of the invention, each evaporator is provided with a fan capable of switching between forward rotation and reverse rotation, when the fan for starting the defrosting evaporator rotates reversely, part of the airflow sent by the refrigerating evaporator enters the independent chamber where the defrosting evaporator is located so as to reduce the humidity in the independent chamber and disturb the frost layer attached to the evaporator, and the reverse flow guiding has the advantages of maintaining the humidity difference in the independent chamber where the defrosting evaporator is located, accelerating the sublimation of the frost layer and enabling the loosened frost layer to fall off after the evaporator rises.
Each independent cavity is provided with an air supply air inlet, an air supply air outlet and a defrosting air outlet, an air supply air channel is formed between the air supply air inlet and the air supply air outlet, a defrosting air channel is formed between the air supply air outlet and the defrosting air outlet, and the on-off states of the air supply air channel and the defrosting air channel are adjusted through valves. The air supply duct of the refrigeration evaporator is communicated, the defrosting duct is closed, the air supply duct of the defrosting evaporator is closed, and the defrosting duct is communicated after entering a defrosting mode for a period of time.
In some embodiments of the present invention, the defrosting outlet is disposed at the bottom of the independent chamber, a water pan 12 is disposed below the defrosting outlet, and the water pan 12 is used for receiving liquid and frost layer falling from the defrosting outlet. For better collection frost layer and make electromagnetic heating sublimation defroster's compact structure, a water collector 12 is shared to all evaporimeters, the appearance of water collector 12 is the infundibulate, the top of water collector 12 is equipped with uncovered, all defrosting air outlets all are located this uncovered top, the bottom of water collector 12 is equipped with the size and is less than open outlet, the below of outlet is equipped with water collector 13, the frost layer that partly falls slips down from water collector 12 collects in water collector 13, all the other most send to the external environment in along with the air through the compressor room at compressor 1 place.
Particularly, the air supply air inlet, the air supply air outlet and the defrosting air outlet are all provided with valves, all the valves can be automatically reset and closed, the automatic reset and closing at the positions means that the air outlets where the valves are located are closed due to automatic resetting of the valves under the action of no external force, the valves at the air supply air outlet are provided with drainage holes with small sizes, and the drainage holes are used for enabling air flow to still enter the independent cavities through the drainage holes after the valves at the air supply air outlet are automatically reset and closed. When the fan of the evaporator rotates forwards, the valve of the air supply inlet and the valve of the air supply outlet are blown open, and the valve of the defrosting outlet automatically resets and closes; when the fan of the evaporator rotates reversely, the valve of the defrosting air outlet is blown open, the airflow enters the independent cavity from the drainage hole, the introduced air volume is small, the influence on the refrigeration effect is low, the temperature of the compartment is basically unchanged, and the food preservation effect is good.
It should be noted that the fan of the refrigeration evaporator is operated in a forward rotation mode after being started, the fan is stopped when the refrigeration evaporator enters a defrosting mode, and the fan of the defrosting evaporator is operated in a reverse rotation mode after being started, that is, the fan of the defrosting evaporator is in a stopped operation state at the initial stage of defrosting and in a reverse rotation operation state at the later stage of defrosting. The automatic resetting and closing of the valve can be realized by various means, two examples are provided below for illustration, and in practical application, the present invention is not limited to a specific installation structure of the valve.
In an embodiment of the invention, all the valves automatically reset and close under the action of gravity, taking the valve of a defrosting air outlet as an example, the valve is hinged at the air outlet corresponding to the valve, a baffle ring abutting against the valve is arranged in the air outlet, the valve is eccentrically designed, the weight of the valve on two sides of a hinged shaft is different, the restoring force for automatic reset and close is provided on the side with large weight, the air flow pushes the side with small weight to rotate in the forward direction when the fan rotates to open the valve, and after the fan stops rotating, the side with large weight pushes the side with small weight to rotate in the reverse direction under the action of gravity until the valve abuts against the baffle ring, so that the automatic reset and close of the valve are completed.
In another embodiment of the invention, all the valves are automatically reset under the action of the elastic element, taking the valve of the air supply inlet as an example, the valve is hinged at the corresponding air inlet, a stop ring which is abutted against the valve is arranged in the air inlet, the hinged shaft is sleeved with the elastic element such as a torsional spring and the like, the torsional spring provides restoring force for automatic reset closing, when the fan rotates, the air flow pushes the valve to rotate in the forward direction to open the valve, the torsional spring deforms along with the rotation of the valve, and after the fan stops rotating, the torsional spring pushes the valve to rotate in the reverse direction under the restoring force until the valve is abutted against the stop ring, so that the automatic reset closing of the valve is completed.
For better understanding of the present invention, the structure of the electromagnetic heating sublimation defrosting apparatus will be described in detail below by taking an example in which the evaporator assembly has two evaporators arranged in parallel.
As shown in fig. 1, two evaporators of the evaporator assembly are respectively a first evaporator 4 and a second evaporator 5, a fan of the first evaporator 4 is a first fan 10, a fan of the second evaporator 5 is a second fan 11, the first evaporator 4 and the second evaporator 5 are connected in parallel through an electromagnetic three-way valve 6 and a one-way valve 7, a port a1 of the electromagnetic three-way valve 6 is connected with an outlet of the throttling device 3, a port B1 is connected with an inlet of the first evaporator 4, and a port C1 is connected with an inlet of the second evaporator 5.
The first evaporator 4 and the second evaporator 5 can alternately provide cooling for the compartment, when the flow path A1-B1 is connected, the first evaporator 4 provides cooling for the compartment, the second evaporator 5 does not provide cooling, when the flow path A1-C1 is connected, the second evaporator 5 provides cooling for the compartment, and the first evaporator 4 does not provide cooling.
The independent chamber where the first evaporator 4 is located is provided with a first electromagnetic coil 8, the first electromagnetic coil 8 is installed at the central position of one side, close to the first evaporator 4, of the partition plate 14, the independent chamber where the second evaporator 5 is located is provided with a second electromagnetic coil 9, and the second electromagnetic coil 9 is installed at the central position of one side, close to the second evaporator 5, of the partition plate 14.
As shown in fig. 2 and 3, the first fan 10 and the second fan 11 are controlled by the motor to rotate forward and backward for bidirectional blowing. The air supply air inlet of the independent cavity where the first evaporator 4 is located is provided with a first air supply air inlet valve 17, the air supply air outlet is provided with a first air supply air outlet valve 15, the defrosting air outlet is provided with a first defrosting air outlet valve 19, the air supply air inlet of the independent cavity where the second evaporator 5 is located is provided with a second air supply air inlet valve 18, the air supply air outlet is provided with a second air supply air outlet valve 16, and the defrosting air outlet is provided with a second defrosting air outlet valve 20.
When the first evaporator 4 is a refrigeration evaporator, the first fan 10 rotates forward, the first air supply inlet valve 17 and the first air supply outlet valve 15 are opened along with the air flow of the fan, the low-temperature air passing through the first evaporator 4 is conveyed into the compartment, and the first defrosting outlet valve 19 is closed. When the second evaporator 5 is a defrosting evaporator, the second fan 11 is turned back after being turned on, the second defrosting air outlet valve 20 is opened along with the fan airflow, the air after the frost layer is sublimated is discharged to the outside through the water receiving tray 12 and the compressor chamber, and the second air supply air inlet valve 18 and the second air supply air outlet valve 16 are closed.
For realizing electromagnetic heating sublimation defroster's automatic control, electromagnetic heating sublimation defroster still includes: the detection module is used for detecting the operating parameters of the evaporator, and the controller adjusts the operating states of the evaporator and the electromagnetic coil according to the operating parameters of the evaporator. Generally, the detection module includes at least one of an air speed sensor for detecting an air speed of the corresponding outlet port after a fan of the evaporator is activated, a temperature sensor for detecting a surface temperature T1 of the evaporator after the evaporator enters a defrost mode, and a timer for counting a defrost time T1 when a solenoid is energized or a reverse rotation time T2 from zero when the fan of the evaporator is turned on in reverse rotation, and in some embodiments, a timer for counting a defrost time T1 and a reverse rotation time T2.
The number of the wind speed sensors, the temperature sensors, and the timers is not limited, and for example, one or two or more temperature sensors may be designed to simultaneously detect the surface temperature t1 of the same evaporator, and the average value of the detected temperatures, the maximum value of the detected temperatures, or the minimum value of the detected temperatures may be taken. For example, one timer may be designed to time the defrosting time T1, another timer may be designed to time the inversion time T2, or the same timer may be used to time the defrosting time T1 and the inversion time T2.
As shown in fig. 4, when any evaporator is turned on to enter a cooling mode as a cooling evaporator, the control method for defrosting by the controller is as follows:
detecting the current running state of the refrigeration evaporator;
judging whether the defrosting condition is met;
if not, returning to detect the current operation state of the refrigeration evaporator;
if so, controlling the current refrigeration evaporator to enter a defrosting mode to serve as a defrosting evaporator, electrifying an electromagnetic coil of the defrosting evaporator to enable the magnetocaloric coating 22 on the surface of the defrosting evaporator to generate heat, simultaneously controlling at least one of the remaining evaporators to enter the refrigeration mode to serve as the refrigeration evaporator, and then executing the following steps;
detecting the surface temperature T1 and the defrosting time T1 of the defrosting evaporator, wherein the defrosting time T1 is counted from zero when the electromagnetic coil is electrified, and the defrosting time T1 can also be counted from zero when the refrigeration evaporator is switched to a defrosting mode;
judging whether the surface temperature T1 is greater than the set temperature T01 or whether the defrosting time T1 is greater than a first set time T01;
if not, returning to detect the surface temperature T1 and the defrosting time T1;
if so, sublimating a frost layer attached to the surface of the defrosting evaporator, gradually softening the frost layer, starting a fan of the defrosting evaporator to reversely rotate, and then executing the following steps;
counting a reverse time T2 from zero when a fan of the defrosting evaporator is started to reversely rotate;
detecting a defrosting air outlet speed V2 and a reverse rotation time T2 of the defrosting evaporator;
judging whether the defrosting air outlet speed V2 is greater than a second set air speed V02 or whether the reverse rotation time T2 is greater than a second set time T02;
if not, returning to detect the defrosting air outlet speed V2 and the reverse rotation time T2;
if so, the defrosting evaporator is indicated to be cleaned, the defrosting evaporator exits from the defrosting mode, and an electromagnetic coil and a fan of the defrosting evaporator are closed.
In an embodiment of the present invention, the supply air-out speed V1 of the refrigeration evaporator is used to determine whether a defrosting condition is satisfied, if the supply air-out speed V1 is less than the first set air speed V01, it indicates that the frost layer attached to the surface of the evaporator is thick, the air flow is blocked, and the defrosting condition is satisfied, and if the supply air-out speed V1 is not less than the first set air speed V01, it indicates that the surface of the evaporator is not frosted or the frost layer is thin, the air flow is relatively smooth, and the defrosting condition is not satisfied. Of course, the defrosting condition may be determined by any one of the determination conditions in the prior art, and the present invention is not limited thereto.
In another embodiment of the invention, the electromagnetic coil has different working gears, the working gear of the electromagnetic coil is adjusted according to the frosting condition, the frosting condition is judged by the difference value between the air supply outlet air speed V1 and the first set air speed V01, when | V1-V01| < the set deviation and V1-V01<0, the frost layer attached to the surface of the evaporator is thinner, the heating amount required by sublimation is small, the electromagnetic coil is electrified according to the first working gear E1, and the first working gear E1 is a low-power gear; when the absolute value of V1-V01 is more than or equal to the set deviation and V1-V01 is less than 0, the fact that a frost layer attached to the surface of the evaporator is thick is shown, the heating amount needed by sublimation is large, the electromagnetic coil is electrified according to a second working gear E2, the second working gear E2 is a high-power gear, and the current of the second working gear E2 is larger than that of the first working gear E1.
Naturally, in practical application, the electromagnetic coil may be powered on at a fixed gear, the set power-on time of the electromagnetic coil is adjusted according to the frosting condition, when the frost layer attached to the surface of the evaporator is thin, the set power-on time of the electromagnetic coil is relatively short, when the frost layer attached to the surface of the evaporator is thick, the set power-on time of the electromagnetic coil is relatively long, the electromagnetic coil is automatically turned off when running to the corresponding set power-on time, and only the fan needs to be turned off when the defrosting evaporator exits the defrosting mode.
In the above description, the air supply outlet air speed V1 is detected by an air speed sensor attached to the air supply outlet, the defrosting outlet air speed V2 is detected by an air speed sensor attached to the defrosting outlet, and the surface temperature t1 of the defrosting evaporator is detected by a temperature sensor attached to the evaporator. The set temperature T01, the first set wind speed V01, the first set time T01, the second set wind speed V02, the set deviation, and the second set time T02 may be designed according to actual application.
For better understanding of the present invention, the following description will be made in detail with respect to the defrosting control method by taking an example in which the evaporator unit has two evaporators arranged in parallel. In the refrigeration process of the refrigeration equipment, whether the current refrigeration evaporator meets the defrosting condition is judged, if yes, the current refrigeration evaporator is switched to be the defrosting evaporator, and the other evaporator is switched to be the refrigeration evaporator. Assuming that the first evaporator 4 is a refrigeration evaporator for cooling the compartment, the deviation is set to 0.2, and the defrosting control method is as follows.
As shown in fig. 5, the first evaporator 4 is turned on to refrigerate, the second evaporator 5 is not to refrigerate, when it is detected that the air speed V1 of the outlet of the first air supply outlet valve 15 is lower than the first set air speed V0, the defrost mode of the first evaporator 4 is turned on, the electromagnetic three-way valve 6 is controlled to change the flow paths a1-B1 to a1-C1, and the second evaporator 5 enters the refrigeration mode. And judging whether the value of | V1-V0 is less than 0.2 and V1-V01 is less than 0, if so, opening the first working position E1 by the first electromagnetic coil 8, otherwise, opening the second working position E2, and timing the defrosting time T1.
At this time, the first evaporator 4 enters a defrosting state, the temperature is slightly raised, and the frost layer on the first evaporator 4 is gradually sublimated by using the air with low original humidity around the first evaporator 4, so that the humidity of the air around the first evaporator 4 is high. The second evaporator 5 is brought into a cooling state and the ambient air humidity is low, so that there is always a humidity difference in the air between the first evaporator 4 and the second evaporator 5.
When the temperature t1 of the first evaporator 4 rises to the first preset temperature t0, the frost layer on the surface of the first evaporator 4 is sublimated and gradually becomes soft, and the first fan 10 can be turned on for reverse rotation. If the temperature of the first evaporator 4 does not reach the first preset temperature T0, but the defrosting time T1 reaches the first set time T01, which indicates that the first evaporator 4 has been heated for a while, the surface frost layer is sublimated, at this time, the first fan 10 may also be turned upside down, a part of the low humidity air sent by the second evaporator 5 is introduced into the independent chamber where the first evaporator 4 is located, and the electromagnetic coil 8 is energized, and then the electromagnetic thermal coating 22 cuts the heat generated by the magnetic induction lines, so as to continuously maintain the humidity difference and the temperature difference in the independent chamber where the first evaporator 4 is located, so that the frost layer on the first evaporator 4 is continuously sublimated, a part of the frost layer which may fall slides down from the water receiving tray 12, and is collected in the water receiving box 13, and the rest is mostly sent to the large environment along with the air through the compressor chamber.
When the defrosting air-out speed V2 at the outlet of the first defrosting air-out valve 19 is detected to be greater than the second set air speed V02, or the reverse rotation time T2 of the first fan 10 is detected to be greater than the second set time T02, it is indicated that the frost layer on the first evaporator 4 is completely removed, the first electromagnetic coil 8 is turned off, the first fan 10 is turned off, the defrosting mode exits, and the first defrosting air-out valve 19 automatically resets and closes after the first fan 10 is turned off.
In conclusion, the electromagnetic heating sublimation defrosting device provided by the invention has the advantages of high defrosting efficiency, low influence on a refrigerating system, more energy conservation, small temperature fluctuation of the compartment, no complex pipeline connection and the like, is suitable for being applied to refrigerating equipment such as a refrigerator and the like, and has stable temperature of the compartment and good food preservation effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (17)
1. Electromagnetic heating sublimation defroster includes: the evaporator assembly is arranged in the refrigerating system and provided with at least two evaporators arranged in parallel; its characterized in that, adjacent two be equipped with the baffle between the evaporimeter, the baffle will independent cavity is separated into in evaporimeter place region, the evaporimeter surface is provided with the hot coating of the magnetism that is used for providing frost layer sublimation heat, install solenoid in the independent cavity, provide alternating magnetic field so that for the hot coating of magnetism when solenoid circular telegram the heat coating of magnetism generates heat, independent cavity is equipped with and is used for blockking the electromagnetic shield layer that alternating magnetic field leaked.
2. The electromagnetic heating sublimation defrosting apparatus of claim 1, wherein after any evaporator in the evaporator assembly enters a defrosting mode as a defrosting evaporator, at least one of the remaining evaporators enters a cooling mode as a cooling evaporator; each evaporator is provided with a forward and reverse rotating fan, and when the fan of the defrosting evaporator is started to rotate reversely, part of airflow sent by the refrigerating evaporator enters an independent cavity where the defrosting evaporator is located.
3. The electromagnetic heating sublimation defrosting device according to claim 1, wherein each of the independent chambers is provided with an air supply inlet, an air supply outlet and a defrosting outlet, an air supply duct is formed between the air supply inlet and the air supply outlet, a defrosting duct is formed between the air supply outlet and the defrosting outlet, and the on-off states of the air supply duct and the defrosting duct are adjusted by valves.
4. The electromagnetic heating sublimation defrosting device of claim 3, wherein the valves are arranged at the air supply inlet, the air supply outlet and the defrosting outlet, all the valves can be automatically reset and closed, and the valve at the air supply outlet is provided with a drainage hole;
when the fan of the evaporator rotates forwards, the valve of the air supply inlet and the valve of the air supply outlet are blown open;
when the fan of the evaporator rotates reversely, the valve of the defrosting air outlet is blown open, and airflow enters the independent chamber from the drainage hole.
5. The electromagnetic heating sublimation defrosting device of claim 3, wherein the defrosting outlet is arranged at the bottom of the independent chamber, and a water pan is arranged below the defrosting outlet and used for receiving liquid and/or frost falling from the defrosting outlet.
6. The electromagnetic heating sublimation defrosting device of claim 5, wherein the water pan is funnel-shaped, the top of the water pan is provided with an opening below all the defrosting air outlets, the bottom of the water pan is provided with a water outlet smaller than the opening, and a water receiving box is arranged below the water outlet.
7. The electromagnetic heating sublimation defrosting apparatus of any one of claims 1 to 6, further comprising: the detection module is used for detecting the operating parameters of the evaporator, and the controller adjusts the operating state of the evaporator and/or the electromagnetic coil according to the operating parameters of the evaporator.
8. The electromagnetic heating sublimation defrosting apparatus of claim 7, wherein the detection module comprises at least one of a wind speed sensor, a temperature sensor, and a timer;
the wind speed sensor is used for detecting the wind speed of the corresponding air outlet after a fan of the evaporator is started;
the temperature sensor is used for detecting the surface temperature t1 of the evaporator after the evaporator enters a defrosting mode;
the timer is used for starting timing the defrosting time T1 when the electromagnetic coil is electrified and/or starting timing the reverse rotation time T2 when the fan of the evaporator is started to rotate reversely.
9. The defrosting control method implemented by the electromagnetic heating sublimation defrosting apparatus of any one of claims 1 to 8, characterized by comprising:
starting any evaporator to enter a refrigeration mode to serve as a refrigeration evaporator, and judging whether the refrigeration evaporator meets defrosting conditions in real time;
and if so, controlling the refrigeration evaporator to enter a defrosting mode to serve as a defrosting evaporator, and electrifying an electromagnetic coil of the defrosting evaporator to heat the magnetic thermal coating on the surface of the defrosting evaporator.
10. The defrost control method of claim 9, wherein determining in real time whether the refrigeration evaporator meets defrost conditions comprises:
detecting the air supply and air outlet speed V1 of the refrigeration evaporator;
judging whether the air supply and air outlet speed V1 is less than a first set air speed V01;
if yes, the defrosting condition is met;
if not, the wind speed V1 is detected in a returning mode.
11. The defrost control method of claim 9, wherein energizing a solenoid of the defrost evaporator comprises:
selecting a working gear of the electromagnetic coil according to a difference value between the air supply and air outlet speed V1 and a first set air speed V01;
when | V1-V01| < the setting deviation and V1-V01<0, the electromagnetic coil is energized in the first operating range E1;
when the absolute value of V1-V01 is more than or equal to the set deviation and V1-V01 is less than 0, the electromagnetic coil is electrified according to the second working gear E2;
wherein the current of the first operating position E1 is smaller than the current of the second operating position E2.
12. The defrost control method of claim 9, further comprising:
after controlling the refrigeration evaporator to enter a defrosting mode to serve as a defrosting evaporator, controlling at least one evaporator in the rest evaporators to enter a refrigeration mode to serve as a refrigeration evaporator;
starting to count the defrost time T1 when the solenoid is energized;
detecting a surface temperature T1 of the defrost evaporator and the defrost time T1;
judging whether the surface temperature T1 is greater than a set temperature T01 or the defrosting time T1 is greater than a first set time T01;
if yes, starting a fan of the defrosting evaporator to reversely rotate;
if not, returning to detect the surface temperature T1 and the defrosting time T1.
13. The defrost control method of claim 12, further comprising:
starting to count reverse time T2 when a fan of the defrosting evaporator is started to reversely rotate;
detecting a defrosting air outlet speed V2 and the reversal time T2 of the defrosting evaporator;
judging whether the defrosting air outlet speed V2 is greater than a second set air speed V02 or the reverse rotation time T2 is greater than a second set time T02;
if so, the defrosting evaporator exits from the defrosting mode, and an electromagnetic coil and a fan of the defrosting evaporator are closed;
and if not, returning to detect the defrosting air outlet speed V2 and the reverse rotation time T2.
14. A refrigeration system, comprising: the compressor, the condenser, the throttling device and the evaporator assembly which are connected in sequence, wherein the refrigeration system adopts the electromagnetic heating sublimation defrosting device as claimed in any one of claims 1 to 8.
15. The refrigerant system as set forth in claim 14, wherein said evaporator assembly has two evaporators, said throttling means being connected to said evaporator assembly by a three-way valve, said three-way valve being switchable between said throttling means and either of said evaporators of said evaporator assembly.
16. Refrigeration device, characterized in that it has a refrigeration system according to claim 14 or 15.
17. The refrigeration appliance of claim 16 wherein the refrigeration appliance is a refrigerator.
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| CN202210048386.8A CN114485012B (en) | 2022-01-17 | 2022-01-17 | Electromagnetic heating sublimation defrosting device, defrosting control method, refrigeration system and equipment |
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| US4648247A (en) * | 1984-10-24 | 1987-03-10 | Sanyo Electric Co | Low-temperature showcase |
| CN108759177A (en) * | 2018-05-09 | 2018-11-06 | 青岛海尔股份有限公司 | Evaporator assembly, the refrigerator with the assembly and refrigerator defrosting control method |
| CN113048670A (en) * | 2021-03-22 | 2021-06-29 | 珠海格力电器股份有限公司 | Refrigerating system, defrosting control method and refrigerator |
| CN113701427A (en) * | 2020-05-22 | 2021-11-26 | 青岛海尔电冰箱有限公司 | Control method of dual-system refrigerator |
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2022
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4648247A (en) * | 1984-10-24 | 1987-03-10 | Sanyo Electric Co | Low-temperature showcase |
| CN108759177A (en) * | 2018-05-09 | 2018-11-06 | 青岛海尔股份有限公司 | Evaporator assembly, the refrigerator with the assembly and refrigerator defrosting control method |
| CN113701427A (en) * | 2020-05-22 | 2021-11-26 | 青岛海尔电冰箱有限公司 | Control method of dual-system refrigerator |
| CN113048670A (en) * | 2021-03-22 | 2021-06-29 | 珠海格力电器股份有限公司 | Refrigerating system, defrosting control method and refrigerator |
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