CN114485012B - 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 PDF

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Publication number
CN114485012B
CN114485012B CN202210048386.8A CN202210048386A CN114485012B CN 114485012 B CN114485012 B CN 114485012B CN 202210048386 A CN202210048386 A CN 202210048386A CN 114485012 B CN114485012 B CN 114485012B
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China
Prior art keywords
defrosting
evaporator
air
refrigeration
air outlet
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CN114485012A (en
Inventor
钟胜兵
牛二帅
卢起彪
邓涵
陆文怡
李凯
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Classifications

    • 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
    • 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
    • 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 refrigerating system and equipment, wherein the electromagnetic heating sublimation defrosting device comprises: an evaporator assembly disposed in the refrigeration system, the evaporator assembly having at least two evaporators disposed in parallel; a partition plate is arranged between two adjacent evaporators, the area where the evaporators are located is divided into independent chambers by the partition plate, the surfaces of the evaporators are provided with magneto-thermal coatings, electromagnetic coils are arranged in the independent chambers, alternating magnetic fields are provided for the magneto-thermal coatings when the electromagnetic coils are electrified, and the independent chambers are provided with electromagnetic shielding layers for blocking leakage of the alternating magnetic fields. Each evaporator is provided with a positive and negative rotating fan, and when the fan of the defrosting evaporator is turned on to rotate reversely, part of air flow sent out by the refrigeration evaporator enters an independent chamber where the defrosting evaporator is located. The invention has the advantages of high defrosting efficiency, low influence on the refrigerating system, more energy saving, small fluctuation of the room temperature, no complex pipeline connection and the like, and is suitable for being applied to refrigerating equipment such as refrigerators and the like.

Description

Electromagnetic heating sublimation defrosting device, defrosting control method, refrigeration system and equipment
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 continuous improvement of living standard, refrigeration equipment is gradually applied in daily life, such as a refrigerator, and a refrigerator refrigerating system is mainly divided into four parts: the device 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 and evaporates in the evaporator to reduce the air temperature. Since the evaporator temperature is lower than the air dew point temperature, moisture in the air will continuously condense into frost on the evaporator. When the frosting amount increases, the heat transfer efficiency of the evaporator is deteriorated, the refrigerating effect is deteriorated, and the power consumption is increased.
The traditional refrigerators all adopt a single evaporator, so that the compressor needs to be stopped during defrosting, the temperature of the compartment rises higher, and the food storage is not good. In addition, most of the refrigerators on the market at present are air-cooled refrigerators, and most of the air-cooled refrigerators adopt an electric heating defrosting mode, an electric heating pipe is arranged below an evaporator, and a frost layer is heated by heating air. Because the defrosting mode is to heat the frost layer by means of natural convection of air, the defrosting efficiency is low and the defrosting time is long.
In the prior art, a defrosting mode capable of improving defrosting efficiency is adopted, an electric heating network is utilized to provide heat for sublimation defrosting, a loose frost layer on an evaporator is shaken off in a vibration defrosting mode, the vibration defrosting mode can influence the stability of an evaporator pipeline interface, resonance phenomenon can occur, and the reliability of a refrigerating system is reduced.
In the prior art, a defrosting mode of heating by hot gas is adopted, a pipeline is utilized to introduce a high-temperature refrigerant into the defrosting evaporator to heat and defrost the defrosting evaporator, but the defrosting mode can increase pipeline connection, so that the mechanical chamber pipeline of the refrigeration equipment is complex in arrangement, and the installation and maintenance are not facilitated.
Disclosure of Invention
In order to solve the problems of low defrosting speed and low efficiency of the existing 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: an evaporator assembly disposed in the refrigeration system, the evaporator assembly having at least two evaporators disposed in parallel; a partition plate is arranged between two adjacent evaporators, the area where the evaporators are located is divided into independent chambers by the partition plate, a magneto-thermal coating for providing sublimation heat for a frost layer is arranged on the surface of each evaporator, an electromagnetic coil is arranged in each independent chamber, an alternating magnetic field is provided for the magneto-thermal coating when the electromagnetic coil is electrified, and an electromagnetic shielding layer for blocking leakage of the alternating magnetic field is arranged in each independent chamber.
Further, after any one of the evaporators in the evaporator assembly enters a defrosting mode as a defrosting evaporator, at least one of the remaining evaporators enters a refrigerating mode as a refrigerating evaporator; each evaporator is provided with a positive and negative rotating fan, and when the fan of the defrosting evaporator is turned on to rotate reversely, part of air flow sent out by the refrigeration evaporator enters an independent chamber where the defrosting evaporator is located.
Further, each independent chamber 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 regulated through valves.
Further, 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 positively, a valve of an air supply air inlet and a valve of an air supply air outlet are opened; when the fan of the evaporator reverses, the valve of the defrosting air outlet is opened, and air flow enters the independent cavity from the drainage hole.
Further, the defrosting air outlet is arranged at the bottom of the independent chamber, and a water receiving disc is arranged below the defrosting air outlet and used for receiving liquid and/or frost layers falling from the defrosting air outlet. The appearance of water collector is the funnel shape, 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 outlet that the size is less than uncovered, and the below of outlet is equipped with the water collector.
Further, the electromagnetic heating sublimation defrosting device further comprises: the device comprises a detection module and a controller connected with the detection module, wherein the detection module is used for detecting the operation parameters of the evaporator, and the controller adjusts the operation state of the evaporator and/or the electromagnetic coil according to the operation 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 a corresponding air outlet after the 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 to count defrosting time T1 when the electromagnetic coil is electrified and/or starting to count reversing time T2 when the fan of the evaporator is started to reverse.
The invention also provides a defrosting control method realized by the electromagnetic heating sublimation defrosting device, which comprises the following steps:
any evaporator is started to enter a refrigeration mode to serve as a refrigeration evaporator, and whether the refrigeration evaporator meets defrosting conditions is judged in real time;
if yes, 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 enable the magnetocaloric coating on the surface of the defrosting evaporator to generate heat.
Wherein, judging whether the refrigeration evaporator meets the defrosting condition in real time includes:
detecting the air supply and air outlet speed V1 of the refrigeration evaporator;
judging whether the air supply and air outlet wind speed V1 is smaller than a first set wind speed V01;
if yes, the defrosting condition is met;
if not, returning to detect the wind speed V1.
Further, energizing the solenoid of the defrost evaporator includes:
selecting a working gear of the electromagnetic coil according to a difference value between the air supply and air outlet wind speed V1 and the first set wind speed V01;
when the absolute value of V1-V01 is less than the set deviation and the absolute value of V1-V01 is less than 0, the electromagnetic coil is electrified according to the first working gear E1;
when the I V1-V01I is not less than 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 working gear E1 is smaller than the current of the second working gear E2.
Further, the defrosting control method further includes:
after controlling the refrigeration evaporator to enter a defrosting mode to serve as a defrosting evaporator, controlling at least one of the remaining evaporators to enter the refrigeration mode to serve as the refrigeration evaporator;
starting to count 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 the first set time T01;
if yes, a fan of the defrosting evaporator is turned on for reversing;
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 turned on for reverse rotation;
detecting defrosting air outlet speed V2 and reversal time T2 of a defrosting evaporator;
judging whether the defrosting air-out wind speed V2 is larger than the second set wind speed V02 or the reversing time T2 is larger than the second set time T02;
if yes, the defrosting evaporator exits the defrosting mode, and an electromagnetic coil and a fan of the defrosting evaporator are closed;
if not, returning to detect the defrosting air-out wind speed V2 and the reversing time T2.
The invention also provides a refrigerating system adopting the electromagnetic heating sublimation defrosting device, which comprises: the compressor, the condenser, the throttling device and the evaporator component are connected in sequence. In some embodiments, the evaporator assembly has two evaporators, and the throttle device is connected to the evaporator assembly by a three-way valve that is switchable to connect the throttle device to either evaporator of 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, a magneto-thermal coating on the surface of the evaporator generates heat due to a cutting magnetic field, and the magneto-thermal coating is directly contacted with the surface of the evaporator for heating, so that the temperature of the defrosting evaporator is slightly increased, the time consumption of the heat generated by the cutting magnetic field is short, the speed is high, the heat is large, the energy is saved compared with electric heating defrosting, and the bypass defrosting heating of a refrigerant is uniform;
2. in the defrosting process, a fan of the defrosting evaporator is turned on to reverse, partial airflow flowing out of the refrigerating evaporator is introduced into an independent cavity where the defrosting evaporator is positioned, low-humidity air is continuously provided for the defrosting evaporator, the humidity increase caused by the sublimation of the frost layer is avoided, and the maximum humidity difference is continuously provided so as to maintain the maximum speed of the sublimation of the frost layer;
3. the compressor does not need to stop in the defrosting process, so that the frequent start and stop times of the compressor are reduced, the service life of the compressor is prolonged, and the operation reliability of a refrigerating system is improved;
4. the areas where the evaporators are located are separated by the partition boards, the air supply of the refrigeration evaporators is not interfered by the defrosting evaporators, the air quantity introduced when the defrosting evaporators are reversed is small, the room temperature 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 power-on time is short, the frosting efficiency is high, and the energy is saved.
Drawings
The invention is described in detail below with reference to examples and figures, wherein:
FIG. 1 is a schematic diagram of a dual evaporator refrigeration system of the present invention;
FIG. 2 is a schematic view of a valve in the present invention when the defrost evaporator blower is reversed;
FIG. 3 is a schematic view of the valve of the defrost evaporator of the present invention at the end of defrosting;
FIG. 4 is a flow chart of a defrost control method in accordance with the present invention;
FIG. 5 is a schematic diagram of a defrost process for a dual evaporator in accordance with the present invention;
wherein, 1 a compressor; 2 a condenser; 3, a throttle valve; 4 a first evaporator; 5 a second evaporator; 6, an 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 receiving disc; 13, a water receiving box; 14 a separator; 15 a first air supply and outlet valve; 16 a second air supply and outlet valve; 17 a first air supply and air inlet valve; 18 a second air supply and air inlet valve; 19 a first defrosting air outlet valve; a second defrosting air outlet valve 20; an electromagnetic shielding layer 21; 22 magneto-caloric coating.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the 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 for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the electromagnetic heating sublimation defrosting device provided by the invention is suitable for a refrigerating system, the refrigerating system mainly comprises four parts, namely a compressor 1, a condenser 2, a throttling device 3 and an evaporator assembly, which are sequentially connected, 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, and the electromagnetic heating sublimation defrosting device is an improvement scheme provided for the part of the evaporator assembly and has the following specific structure.
Electromagnetic heating sublimates defroster includes: the evaporator assembly is arranged in a refrigerating system, the evaporator assembly is provided with at least two evaporators which are arranged in parallel, a one-way valve 7 which only allows refrigerant to flow out is arranged at the outlet of each evaporator, each evaporator in the evaporator assembly is arranged separately, two adjacent evaporators are separated by a partition plate 14, the area where the evaporators are located is separated into independent chambers by the partition plate 14, the surface of each evaporator is provided with a magneto-thermal coating 22, the magneto-thermal coating 22 contains magneto-thermal materials such as iron, nickel and the like, an electromagnetic coil which supplies alternating magnetic field to the magneto-thermal coating 22 when the evaporators are electrified is arranged in the independent chambers where the evaporators are located, after the evaporators enter a defrosting mode, the electromagnetic coil is powered to supply heat to the defrosting evaporators, so that frost layers attached to the surfaces of the defrosting evaporators sublimate.
The independent cavity is provided with an electromagnetic shielding layer 21 surrounding the evaporator, a copper net with more than 100 meshes is used as a shielding material, and of course, the electromagnetic shielding layer 21 can be made of copper plates or aluminum plates and other metals, electromagnetic coils are separated through the electromagnetic shielding layer 21, the mutual interference 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 the independent chamber or embedded in the independent chamber, and since the partition 14 is partitioned between two adjacent evaporators, the electromagnetic shielding layer 21 may be embedded in the partition, and the two evaporators share one partition 14.
In one embodiment of the present invention, after any one of the evaporators in the evaporator assembly enters the defrost mode, at least one of the remaining evaporators enters the refrigeration mode, the evaporator entering the defrost mode is referred to as the defrost evaporator, the evaporator entering the refrigeration mode is referred to as the refrigeration evaporator, and the evaporator adjacent to the defrost evaporator is preferentially selected to perform the refrigeration mode, so that a humidity difference is generated between the defrost evaporator and the refrigeration evaporator. The compressor 1 does not need to stop in the defrosting process, the frequent start and stop times of the compressor 1 are reduced, the service life of the compressor is prolonged, the running reliability of a refrigerating system is improved, and the room temperature is not affected in the defrosting process.
In order to improve defrosting efficiency, in another embodiment of the present invention, each evaporator is configured with a fan capable of switching between forward rotation and reverse rotation, when the fan of the defrosting evaporator is turned on to reverse rotation, part of air flow sent out by the refrigeration evaporator enters an independent chamber where the defrosting evaporator is located, so as to reduce humidity in the independent chamber and disturb a frost layer attached to the evaporator, and reverse rotation drainage has the advantages of maintaining humidity difference in the independent chamber where the defrosting evaporator is located, accelerating sublimation of the frost layer, and simultaneously enabling the loosened frost layer on the evaporator to fall off after sublimation.
Each independent chamber 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 regulated through valves. The air supply channel of the refrigeration evaporator is connected, the defrosting channel is closed, the air supply channel of the defrosting evaporator is closed, and the defrosting channel is connected after entering the defrosting mode for a period of time.
In some embodiments of the present invention, the defrosting air outlet is disposed at the bottom of the independent chamber, and a water tray 12 is disposed below the defrosting air outlet, where the water tray 12 is used for receiving the liquid and frost falling from the defrosting air outlet. For better collecting frost layer and making electromagnetic heating sublimate defroster's compact structure, all evaporators share a water collector 12, and water collector 12's appearance is funnel-shaped, and the top of water collector 12 is equipped with the opening, and all defrosting air outlets all are located this open top, and water collector 12's bottom is equipped with the outlet that the size is less than the open, and the below of outlet is equipped with water collector 13, and the frost layer of partly falling is from water collector 12 to slide down to collect in water collector 13, and the rest of majority all is in the external environment of being sent to through the compressor room that compressor 1 is located with the air.
Specifically, 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 position means that the valve is automatically reset to enable the air outlet where the valve is positioned to be closed under the action of no external force, the valve of the air supply air outlet is provided with a drainage hole with smaller size, and the drainage hole has the function that after the valve of the air supply air outlet is automatically reset and closed, air flow still can enter the independent cavity through the drainage hole. When the fan of the evaporator rotates positively, the valve of the air supply air inlet and the valve of the air supply air outlet are opened, and the valve of the defrosting air outlet is automatically reset and closed; when the fan of the evaporator is reversed, the valve of the defrosting air outlet is opened, air flow enters the independent cavity from the drainage hole, the introduced air quantity is small, the influence on the refrigerating effect is low, the room temperature is basically unchanged, and the food preservation effect is good.
The fan of the refrigeration evaporator is started and then is in forward running, the fan stops running when the refrigeration evaporator enters a defrosting mode, and the fan of the defrosting evaporator is started and then is in reverse running, namely, the fan of the defrosting evaporator is in a stop running state at the initial stage of defrosting and is in a reverse running state at the later stage of defrosting. The automatic resetting and closing of the valve can be achieved by various means, and the following two embodiments are provided for illustration, and the specific installation structure of the valve is not particularly limited in practical application.
In one embodiment of the invention, all valves are automatically reset and closed under the action of gravity, the valves of the defrosting air outlet are taken as an example, the valves are hinged at the corresponding air outlets, baffle rings which are propped against the valves are arranged in the air outlets, the valves are eccentrically designed, the weight of the valves on two sides of the hinge shafts is different, the side with high weight provides the restoring force for automatic reset and closing, when the fan rotates, the air flow pushes the side with low weight to rotate forward so as to open the valves, and after the fan stops rotating, the side with high weight pushes the side with low weight to rotate reversely under the action of gravity until the valves prop against the baffle rings, so that the automatic reset and closing of the valves are completed.
In another embodiment of the invention, all valves are automatically reset under the action of the elastic piece, taking the valve of the air supply air inlet as an example, the valve is hinged at the corresponding air inlet, a baffle ring which is propped against the valve is arranged in the air inlet, elastic pieces such as a torsion spring are sleeved on a hinge shaft, the torsion spring provides a restoring force for automatic reset closing, when the fan rotates, the air flow pushes the valve to rotate forward to open the valve, the torsion spring deforms along with the rotation of the valve, and after the fan stops rotating, the torsion spring pushes the valve to rotate reversely under the action of the restoring force until the valve is propped against the baffle ring, so that the automatic reset closing of the valve is completed.
In order to better understand the present invention, the structure of the electromagnetic heating sublimation defrosting device 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 a first evaporator 4 and a second evaporator 5 respectively, 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, an A1 port of the electromagnetic three-way valve 6 is connected with an outlet of the throttling device 3, a B1 port is connected with an inlet of the first evaporator 4, and a C1 port is connected with an inlet of the second evaporator 5.
The first evaporator 4 and the second evaporator 5 can alternately provide refrigeration for compartments, when the A1-B1 flow path is connected, the first evaporator 4 is used for compartment refrigeration, the second evaporator 5 is not used for refrigeration, when the A1-C1 flow path is connected, the second evaporator 5 is used for compartment refrigeration, and the first evaporator 4 is not used for refrigeration.
The independent chamber where the first evaporator 4 is located is provided with a first electromagnetic coil 8, the first electromagnetic coil 8 is arranged at the center position of the partition 14 close to one side of the first evaporator 4, 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 arranged at the center position of the partition 14 close to one side of the second evaporator 5.
As shown in fig. 2 and 3, the first fan 10 and the second fan 11 are used for bidirectional blowing by controlling the forward and reverse rotation of the motor. The air inlet of the independent chamber where the first evaporator 4 is located is provided with a first air inlet valve 17, the air outlet is provided with a first air outlet valve 15, the defrosting outlet is provided with a first defrosting outlet valve 19, the air inlet of the independent chamber where the second evaporator 5 is located is provided with a second air inlet valve 18, the air outlet is provided with a second air outlet valve 16, and the defrosting outlet is provided with a second defrosting outlet valve 20.
When the first evaporator 4 is a refrigeration evaporator, the first fan 10 rotates forward, the first air supply and inlet valve 17 and the first air supply and outlet valve 15 are opened along with the fan airflow, the low-temperature air passing through the first evaporator 4 is conveyed into the room, and the first defrosting air outlet valve 19 is closed. When the second evaporator 5 is a defrosting evaporator, the second fan 11 is turned on and then reversely operates, the second defrosting air outlet valve 20 is opened along with the air flow of the fan, the sublimated air in the frost layer is discharged to the outside through the water receiving disc 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.
In order to realize the automatic control of electromagnetic heating sublimation defroster, electromagnetic heating sublimation defroster still includes: the detection module is used for detecting the operation parameters of the evaporator, and the controller is used for adjusting the operation states of the evaporator and the electromagnetic coil according to the operation parameters of the evaporator. Generally, the detection module includes at least one of a wind speed sensor for detecting a wind speed of the corresponding air outlet after the fan of the evaporator is started, a temperature sensor for detecting a surface temperature T1 of the evaporator after the evaporator enters a defrost mode, and a timer for starting timing the defrost time T1 when the electromagnetic coil is energized or for starting timing the reversal time T2 from zero when the fan of the evaporator is turned on and reversing time T2, in some embodiments, the timer is used for timing the defrost time T1 and the reversal time T2.
The number of the wind speed sensor, the temperature sensor, and the timer is not limited, and for example, one or two or more temperature sensors may be designed to detect the surface temperature t1 of the same evaporator at the same time, and an average value of the detected temperatures, a maximum value of the detected temperatures, a minimum value of the detected temperatures, or the like may be taken. For example, one timer may be designed to count the defrosting time T1, another timer may be designed to count the reversing time T2, and the same timer may be used to count the defrosting time T1 and the reversing time T2.
As shown in fig. 4, any one of the evaporators is turned on to enter a cooling mode as a cooling evaporator, and the controller performs a defrosting control method as follows:
detecting the current running condition of the refrigeration evaporator;
judging whether a defrosting condition is met;
if not, returning to detect the running condition of the current refrigeration evaporator;
if yes, controlling the current refrigeration evaporator to enter a defrosting mode to serve as the defrosting evaporator, electrifying an electromagnetic coil of the defrosting evaporator to enable the magneto-thermal coating 22 on the surface of the defrosting evaporator to generate heat, 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 be counted from zero when the refrigerating evaporator is switched into the defrosting mode;
judging whether the surface temperature T1 is greater than the set temperature T01 or whether the defrosting time T1 is greater than the first set time T01;
if not, returning to the detection surface temperature T1 and the defrosting time T1;
if yes, sublimating a frost layer attached to the surface of the defrosting evaporator, gradually becoming soft, starting a fan of the defrosting evaporator to reversely rotate, and then executing the following steps;
starting a fan of the defrosting evaporator to reversely rotate, and timing a reverse rotation time T2 from zero;
detecting defrosting air outlet speed V2 and reversal time T2 of a defrosting evaporator;
judging whether the defrosting air-out wind speed V2 is larger than the second set wind speed V02 or the reversing time T2 is larger than the second set time T02;
if not, returning to detect the defrosting air-out wind speed V2 and the reversing time T2;
if yes, the frost layer attached to the surface of the defrosting evaporator is cleaned, the defrosting evaporator exits the defrosting mode, and an electromagnetic coil and a fan of the defrosting evaporator are turned off.
In one embodiment of the invention, the air supply and air outlet speed V1 of the refrigeration evaporator is adopted to judge whether the defrosting condition is met, if the air supply and air outlet speed V1 is smaller than the first set air speed V01, the frost layer attached to the surface of the evaporator is thicker, the air flow is blocked, the defrosting condition is met, and if the air supply and air outlet speed V1 is not smaller than the first set air speed V01, the surface of the evaporator is not frosted or the frost layer is thinner, the air flow is smoother, and the defrosting condition is not met. Of course, any judgment condition in the prior art is also adopted as the defrosting condition, and the invention is not particularly limited thereto.
In another embodiment of the present invention, the electromagnetic coil has different working gear positions, the working gear position of the electromagnetic coil is adjusted according to the frosting condition, the frosting condition is judged by the difference value between the air supply air outlet wind speed V1 and the first set wind speed V01, when |v1-v01| < 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 position E1, and the first working gear position E1 is a low-power gear position; when the I V1-V01I is more than or equal to the set deviation and V1-V01 is less than 0, the fact that the frost layer attached to the surface of the evaporator is thicker is indicated, the heating amount required by sublimation is large, the electromagnetic coil is electrified according to the 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.
Of course, in practical application, the electromagnetic coil can be electrified in a fixed gear, the set electrifying time of the electromagnetic coil is adjusted according to the frosting condition, when the frost layer attached to the surface of the evaporator is thinner, the set electrifying time of the electromagnetic coil is shorter, when the frost layer attached to the surface of the evaporator is thicker, the set electrifying time of the electromagnetic coil is longer, the electromagnetic coil is automatically closed when running to the corresponding set electrifying time, and only the fan is required to be closed when the defrosting evaporator exits the defrosting mode.
It should be noted that, the air-out speed V1 of the air supply and the air-out speed is detected by the air-speed sensor installed at the air-out opening, the defrost air-out speed V2 is detected by the air-speed sensor installed at the defrost air-out opening, and the surface temperature t1 of the defrost evaporator is detected by the temperature sensor installed on 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 practical application.
For a better understanding of the present invention, the following will describe in detail the defrost control method, taking the case of an evaporator assembly having two evaporators arranged in parallel. In the refrigerating process of the refrigerating equipment, judging whether the current refrigerating evaporator meets the defrosting condition, if so, switching the current refrigerating evaporator into the defrosting evaporator, and switching the other evaporator into the refrigerating evaporator. Assuming that the first evaporator 4 is a refrigeration evaporator for cooling the compartments, 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 cool, the second evaporator 5 is not cooled, when the air supply and air outlet speed V1 of the outlet of the first air supply and air outlet valve 15 is detected to be lower than the first set air speed V0, the defrosting mode of the first evaporator 4 is turned on, the electromagnetic three-way valve 6 is controlled to change the flow path from A1 to B1 to A1 to C1, and the second evaporator 5 enters the cooling mode. Judging whether the value of the I V1-V0 is smaller than 0.2 and V1-V01 is smaller than 0, if so, starting the first working gear E1 by the first electromagnetic coil 8, otherwise, starting the second working gear E2, and timing defrosting time T1.
At this time, the first evaporator 4 is in 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 refrigerated 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 surface frost layer of the first evaporator 4 is sublimated and gradually becomes soft, and at this time, the first fan 10 can be turned on for inversion. If the temperature of the first evaporator 4 does not reach the first preset temperature T0, but the defrosting time T1 reaches the first preset time T01, which indicates that the first evaporator 4 has been heated for a period of time, the surface frost layer sublimates, the first fan 10 can be started to reverse at this time, a part of low humidity air sent out by the second evaporator 5 is introduced into the independent chamber where the first evaporator 4 is located, and the heat generated by cutting the magnetic induction wire by the magneto-caloric coating 22 after the first electromagnetic coil 8 is electrified is continuously maintained, so that the humidity and the temperature difference in the independent chamber where the first evaporator 4 is located continuously maintain, the frost layer on the first evaporator 4 continuously sublimates, a part of the frost layer which may fall down slides down from the water receiving disc 12 and is collected in the water receiving box 13, and the rest of the frost layer is sent to the large environment along with the air through the compressor chamber.
When the defrosting air outlet speed V2 of the outlet of the first defrosting air outlet valve 19 is detected to be larger than the second set air speed V02 or the reverse time T2 of the first fan 10 is larger than the second set time T02, the first electromagnetic coil 8 is closed, the first fan 10 is closed, the defrosting mode is exited, and the first defrosting air outlet valve 19 is automatically reset to be closed after the first fan 10 is closed.
In summary, 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 saving, small fluctuation of the room temperature, no complex pipeline connection and the like, is suitable for being applied to refrigerating equipment such as a refrigerator, has stable room temperature and good food preservation effect.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (16)

1. Electromagnetic heating sublimates defroster, includes: an evaporator assembly disposed in the refrigeration system, the evaporator assembly having at least two evaporators disposed in parallel; the device is characterized in that a partition plate is arranged between two adjacent evaporators, the partition plate divides the area where the evaporators are positioned into independent chambers, the surfaces of the evaporators are provided with a magneto-thermal coating for providing sublimation heat of a frost layer, an electromagnetic coil is arranged in each independent chamber, when the electromagnetic coil is electrified, an alternating magnetic field is provided for the magneto-thermal coating to heat the magneto-thermal coating, and each independent chamber is provided with an electromagnetic shielding layer for blocking leakage of the alternating magnetic field;
every independent cavity all is equipped with air supply air intake, air supply air outlet and defrosting air outlet, the air supply air intake with form the air supply wind channel between the air supply air outlet, the air supply air outlet with the defrosting wind channel that forms between the defrosting air outlet, the air supply wind channel with the break-make state in defrosting wind channel passes through the valve adjustment.
2. The electromagnetic heating sublimation defrost apparatus as recited in claim 1, wherein after any one of the evaporator assemblies enters a defrost mode as a defrost evaporator, at least one of the remaining evaporators enters a refrigeration mode as a refrigeration evaporator; and each evaporator is provided with a positive and negative rotation fan, and when the fan of the defrosting evaporator is turned on to rotate reversely, part of air flow sent out by the refrigeration evaporator enters an independent chamber where the defrosting evaporator is located.
3. The electromagnetic heating sublimating and defrosting device according to claim 1, wherein the air supply inlet, the air supply outlet and the defrosting outlet are all provided with the valves, all the valves can be automatically reset and closed, and the valves of the air supply outlet are provided with drainage holes;
when the fan of the evaporator rotates positively, the valve of the air supply air inlet and the valve of the air supply air outlet are opened;
when the fan of the evaporator reverses, the valve of the defrosting air outlet is opened, and air flow enters the independent cavity from the drainage hole.
4. The electromagnetic heating sublimating and defrosting device according to claim 1, wherein the defrosting air outlet is arranged at the bottom of the independent chamber, and a water receiving disc is arranged below the defrosting air outlet and is used for receiving liquid and/or frost layers falling from the defrosting air outlet.
5. The electromagnetic heating sublimating and defrosting device according to claim 4, wherein the water receiving tray is funnel-shaped in appearance, an opening below all defrosting air outlets is formed in the top of the water receiving tray, a water outlet smaller than the opening in size is formed in the bottom of the water receiving tray, and a water receiving box is arranged below the water outlet.
6. The electromagnetic heating sublimation defrosting apparatus of any one of claims 1-5, further comprising: the detection module is used for detecting the operation parameters of the evaporator, and the controller adjusts the operation states of the evaporator and/or the electromagnetic coil according to the operation parameters of the evaporator.
7. The electromagnetic heating sublimation defrosting apparatus of claim 6, 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 a corresponding air outlet after the 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 to count defrosting time T1 when the electromagnetic coil is electrified and/or starting to count reversing time T2 when the fan of the evaporator is turned on and reversed.
8. A defrosting control method achieved by the electromagnetic heating sublimation defrosting apparatus according to any one of claims 1 to 7, characterized by comprising:
any evaporator is started to enter a refrigeration mode to serve as a refrigeration evaporator, and whether the refrigeration evaporator meets defrosting conditions is judged in real time;
if yes, 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 enable a magneto-caloric coating on the surface of the defrosting evaporator to generate heat.
9. The defrost control method of claim 8, wherein determining in real time whether the refrigeration evaporator satisfies a defrost condition comprises:
detecting the air supply and air outlet speed V1 of the refrigeration evaporator;
judging whether the air supply and air outlet wind speed V1 is smaller than a first set wind speed V01;
if yes, the defrosting condition is met;
if not, returning to detect the wind speed V1.
10. The defrost control method of claim 9, wherein energizing the 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 wind speed V1 and a first set wind speed V01;
when the absolute value of V1-V01 is less than the set deviation and the absolute value of V1-V01 is less than 0, the electromagnetic coil is electrified according to a first working gear E1;
when the I V1-V01I is more than or equal to the set deviation and V1-V01 is less than 0, the electromagnetic coil is electrified according to a second working gear E2;
the current of the first working gear E1 is smaller than that of the second working gear E2.
11. The defrost control method of claim 8, further comprising:
after the refrigerating evaporator is controlled to enter a defrosting mode to serve as a defrosting evaporator, at least one of the remaining evaporators is controlled to enter a refrigerating mode to serve as the refrigerating evaporator;
starting to count defrosting time T1 when the electromagnetic coil is electrified;
detecting a surface temperature T1 of the defrosting evaporator and the defrosting time T1;
judging whether the surface temperature T1 is greater than a set temperature T01 or whether the defrosting time T1 is greater than a first set time T01;
if yes, turning on a fan of the defrosting evaporator for reversing;
if not, returning to detect the surface temperature T1 and the defrosting time T1.
12. The defrost control method of claim 11, further comprising:
starting to count reverse time T2 when a fan of the defrosting evaporator is turned on to reverse;
detecting a defrosting air outlet speed V2 and the reversing time T2 of the defrosting evaporator;
judging whether the defrosting air outlet wind speed V2 is larger than a second set wind speed V02 or the reversing time T2 is larger than a second set time T02;
if yes, the defrosting evaporator exits the defrosting mode, and an electromagnetic coil and a fan of the defrosting evaporator are closed;
if not, returning to detect the defrosting air-out wind speed V2 and the reversing time T2.
13. A refrigeration system, comprising: a compressor, a condenser, a throttling device and an evaporator assembly connected in sequence, wherein the refrigeration system employs the electromagnetic heating sublimation defrosting device of any one of claims 1 to 7.
14. The refrigeration system as recited in claim 13 wherein said evaporator assembly has two evaporators and said throttling means is connected to said evaporator assembly by a three-way valve, said three-way valve being switchable between said throttling means and either one of said evaporator assemblies.
15. Refrigeration device, characterized in that it has a refrigeration system according to claim 13 or 14.
16. The refrigeration appliance of claim 15 wherein the refrigeration appliance is a refrigerator.
CN202210048386.8A 2022-01-17 2022-01-17 Electromagnetic heating sublimation defrosting device, defrosting control method, refrigeration system and equipment Active CN114485012B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
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
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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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