CN107763936B - Air-cooled refrigerator and defrosting method of evaporator thereof - Google Patents
Air-cooled refrigerator and defrosting method of evaporator thereof Download PDFInfo
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- CN107763936B CN107763936B CN201711156150.1A CN201711156150A CN107763936B CN 107763936 B CN107763936 B CN 107763936B CN 201711156150 A CN201711156150 A CN 201711156150A CN 107763936 B CN107763936 B CN 107763936B
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- 238000010257 thawing Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007710 freezing Methods 0.000 claims abstract description 83
- 230000008014 freezing Effects 0.000 claims abstract description 83
- 238000001514 detection method Methods 0.000 claims abstract description 71
- 238000001704 evaporation Methods 0.000 claims description 28
- 239000003507 refrigerant Substances 0.000 claims description 28
- 230000008020 evaporation Effects 0.000 claims description 26
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 description 15
- 238000005057 refrigeration Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000004321 preservation Methods 0.000 description 3
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- 230000001186 cumulative effect Effects 0.000 description 1
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- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009920 food preservation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000009423 ventilation Methods 0.000 description 1
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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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- 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
- F25D17/062—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 in household refrigerators
- F25D17/065—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 in household refrigerators with compartments at different temperatures
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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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/003—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors with respect to movable containers
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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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
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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
- 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 relates to an air-cooled refrigerator and an evaporator defrosting method thereof. The air-cooled refrigerator comprises: the refrigerator comprises a refrigerating chamber, a temperature detection module, a humidity detection module and a control module; the freezing chamber comprises an evaporator and a heater, the heater is connected with the evaporator, and the evaporator, the temperature detection module and the humidity detection module are all electrically connected with the control module; the control module can improve the environmental adaptability of the air-cooled refrigerator, reduce the power consumption of the air-cooled refrigerator and ensure the fresh-keeping quality of food stored in the air-cooled refrigerator by adopting the evaporator defrosting method.
Description
Technical Field
The invention relates to the technical field of refrigerators, in particular to an air-cooled refrigerator and an evaporator defrosting method thereof.
Background
With the continuous improvement of the living standard of people and the great progress of social development, the quality requirements of people on household appliances are higher and higher, especially the refrigerator household appliances which are closely related to life. Most of refrigerator refrigeration household appliances used by people at present are direct-cooling products, and the direct-cooling refrigerator has the advantages of low price, convenience in operation and the like, so that the direct-cooling refrigerator is accepted by many people, however, with great progress of society, more and more high-end air-cooling household refrigerators gradually enter the visual field of people. Although the air-cooled refrigerator has the advantages of uniform temperature in the compartment, high refrigerating speed, high-end atmosphere appearance and the like compared with a direct-cooled refrigerator, the air-cooled refrigerator has the defects of increased power consumption, poor fresh-keeping effect of stored food and the like due to factors such as improper design or operation in the design process and the use process of a user.
For the air-cooled refrigerator, when the following problems occur during the use of the user: the stored food evaporates moisture, frequently opens and closes the door or forgets to close the door, once only put into too much food of higher temperature, humidity is great, in the summer of high temperature and high humidity, get and put the food condition such as the door opening number of times is too many, can cause the refrigerator to work for a long time under the environment of high temperature and high humidity, thereby cause to gather thicker ice layer on the evaporator surface of refrigerator, thereby the heat transfer thermal resistance on evaporator surface and the circulating resistance of evaporator surface air have been increased, so the refrigerator is under predetermined normal defrosting control time and predetermined defrosting withdraw of temperature, thicker ice layer or frost layer are hardly melted completely on the evaporator. Therefore, when the refrigerator continues to run for refrigeration after the period of incomplete defrosting is finished, the unmelted ice layer or frost layer covers the surface of the evaporator, thereby seriously influencing the air convection exchange on the surface of the evaporator, causing the reduction of the refrigeration capacity of the refrigerator and the reduction of the evaporation temperature, correspondingly prolonging the running time of the refrigerator, increasing the power consumption and influencing the fresh-keeping quality of products.
In order to overcome the defects of the refrigerator in the refrigeration industry at present, methods such as increasing the defrosting power of a defrosting heater or increasing the defrosting exit temperature to prolong the defrosting time are correspondingly adopted to melt a frost layer more thoroughly. However, increasing the power of the defrosting heater and increasing the defrosting exit temperature not only increases the power consumption of the refrigerator, but also increases the temperature in the refrigerator compartment, and the higher temperature greatly affects the fresh-keeping quality of the food.
Disclosure of Invention
Therefore, the air-cooled refrigerator and the defrosting method of the evaporator thereof are needed to solve the problems that the refrigerator in the prior art is incomplete in defrosting, an ice layer or a frost layer covers the surface of the evaporator, so that the air convection exchange on the surface of the evaporator is seriously influenced, the refrigerating capacity of the refrigerator is reduced, the evaporation temperature is reduced, the running time of the refrigerator is long, the power consumption is high, and the preservation quality of stored food is poor.
An evaporator defrosting method, comprising the following steps: detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator, and acquiring a defrosting temperature difference of the refrigerator according to the difference between the temperature of the freezing chamber and the evaporation temperature of the refrigerant in the evaporator; judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work; judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
In one embodiment, the method for controlling the heater to start comprises the steps of detecting the defrosting time of the heater and judging whether the defrosting time is less than or equal to a preset defrosting time, if so, controlling the heater to start, and further comprises the following steps: otherwise, controlling the heater to stop working.
In one embodiment, the detecting the freezer compartment temperature and determining whether it is less than or equal to a preset exit temperature, if so, controlling the heater to stop working further comprises: otherwise, controlling the heater to stop working within a preset time.
In one embodiment, the step of controlling the heater to stop operating within a preset time further includes: and detecting whether the accumulated working time of the compressor is less than the preset time, if so, continuing to control the heater to stop working.
In one embodiment, detecting whether the accumulated working time of the compressor is less than a preset time, if so, continuing to control the heater to stop working, further comprising: otherwise, controlling the heater to start working.
In one embodiment, the step of detecting that the accumulated working time of the compressor is less than the preset time, and otherwise, controlling the heater to start working further comprises the following steps:
and detecting whether the temperature of the freezing chamber is less than or equal to the preset exit temperature again, and controlling the heater to stop working if the temperature of the freezing chamber is less than or equal to the preset exit temperature.
In one embodiment, the determining whether the defrosting temperature difference is greater than a preset temperature difference, and if so, controlling a heater of the evaporator to start up, further includes: otherwise, controlling the heater to stop working.
In one embodiment, the step of determining whether the ambient temperature is less than the preset temperature and/or the ambient humidity is less than the preset humidity further includes: and acquiring the available storage volume of the freezing chamber and judging whether the available storage volume is smaller than a preset minimum volume, if so, executing the steps of detecting the temperature of the freezing chamber and judging whether the available storage volume is smaller than or equal to a preset exit temperature.
In one embodiment, the step of determining whether the ambient temperature is less than the preset temperature and/or the ambient humidity is less than the preset humidity further includes: and acquiring the humidity of the freezing chamber and judging whether the humidity is less than the preset lowest humidity, if so, executing the steps of detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to the preset exit temperature.
An air-cooled refrigerator comprising: the refrigerator comprises a refrigerating chamber, a temperature detection module, a humidity detection module and a control module; the freezing chamber comprises an evaporator and a heater, the heater is connected with the evaporator, and the evaporator, the temperature detection module and the humidity detection module are all electrically connected with the control module; the temperature detection module comprises a first detection module, a second detection module and a third detection module; the first detection module is used for detecting the temperature of the freezing chamber, the second detection module is used for detecting the ambient temperature, and the third detection module is used for detecting the evaporation temperature of the refrigerant in the evaporator; the humidity detection module is used for detecting the environment humidity; the control module is used for detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator, and acquiring the defrosting temperature difference of the refrigerator according to the difference between the temperature of the freezing chamber and the evaporation temperature of the refrigerant in the evaporator; judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work; judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
According to the air-cooled refrigerator and the defrosting method of the evaporator of the air-cooled refrigerator, the defrosting temperature difference of the refrigerator is obtained by detecting the temperature of the freezing chamber of the refrigerator and the evaporating temperature of the refrigerant in the evaporator and obtaining the difference value of the defrosting temperature difference, and the defrosting temperature difference is compared with the preset temperature difference, so that the refrigerator can control the heater of the evaporator to work at different environmental temperatures, the air-cooled refrigerator can be suitable for normal operation in various complex environments, the fresh-keeping quality of food stored in the freezing chamber is guaranteed, and meanwhile, the energy-saving effect of the air-cooled refrigerator can be improved.
Drawings
Fig. 1 is a schematic diagram of a logic structure of an air-cooled refrigerator according to an embodiment.
FIG. 2 is a schematic flow chart of an evaporator defrosting method according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "top," "bottom," "top," and the like are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
For example, an air-cooled refrigerator includes: the refrigerator comprises a refrigerating chamber, a temperature detection module, a humidity detection module and a control module; the freezing chamber comprises an evaporator and a heater, the heater is connected with the evaporator, and the evaporator, the temperature detection module and the humidity detection module are all electrically connected with the control module; the temperature detection module comprises a first detection module, a second detection module and a third detection module; the first detection module is used for detecting the temperature of the freezing chamber, the second detection module is used for detecting the ambient temperature, and the third detection module is used for detecting the evaporation temperature of the refrigerant in the evaporator; the humidity detection module is used for detecting the environment humidity; the control module is used for detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator, and acquiring the defrosting temperature difference of the refrigerator according to the difference between the temperature of the freezing chamber and the evaporation temperature of the refrigerant in the evaporator; judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work; judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
As shown in fig. 1, in one embodiment, an air-cooled refrigerator 10 includes: a freezing chamber 100, a temperature detection module 200, a humidity detection module 300 and a control module 400; the freezing compartment 100 includes an evaporator 110 and a heater 120, the heater 120 is connected to the evaporator 110, and the evaporator 110, the temperature detection module 200 and the humidity detection module 300 are all electrically connected to the control module 400;
the temperature detection module 200 comprises a first detection module 210, a second detection module 220 and a third detection module 230; the first detection module 210 is configured to detect a temperature of a freezer compartment, the second detection module 220 is configured to detect an ambient temperature, and the third detection module 230 is configured to detect an evaporation temperature of a refrigerant inside the evaporator; the humidity detection module 300 is used for detecting the environmental humidity;
the control module 400 is configured to detect a freezing compartment temperature of the refrigerator and an evaporation temperature of a refrigerant inside the evaporator, and obtain a defrosting temperature difference of the refrigerator according to a difference between the freezing compartment temperature and the evaporation temperature of the refrigerant inside the evaporator; judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work; judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
In this embodiment, the control module 400 is a main control module or a main control chip of the air-cooled refrigerator 10, and is configured to control operations of various electrical components of the air-cooled refrigerator 10. When the evaporator 110 is operated for a long time and the surface thereof is covered with a frost layer, and the refrigeration effect of the evaporator 110 is poor, the control module 400 controls the heater 120 to start to operate, so that the frost layer on the surface of the evaporator 110 is heated and evaporated into moisture; when the temperature in the freezing compartment 100 is detected to be recovered to be normal and the air-cooled refrigerator 10 can normally work, the control module 400 controls the heater 120 to stop working, so that the evaporator 110 can recover normal refrigeration operation in time, the storage temperature of the freezing compartment 100 is prevented from being influenced by continuous heating and defrosting, and the preservation quality of the food stored in the freezing compartment 100 is ensured. In addition, the air-cooled refrigerator can start or stop the operation of the heater 120 in time through the control module 400, so that the working time of a compressor of the air-cooled refrigerator can be reduced, the power consumption of the air-cooled refrigerator is effectively reduced, and the energy-saving effect of the air-cooled refrigerator is improved.
In this embodiment, the freezing compartment 100 is a compartment for storing food materials, the evaporator 110 is disposed on a side wall of the freezing compartment 100, wherein the evaporator 110 is filled with a refrigerant, and the refrigerant is heated and evaporated, so that the temperature of the evaporator 110 can be reduced, and then the temperature of the freezing compartment 100 is reduced, so as to ensure that the freezing compartment 100 is in a good freezing environment.
It should be understood that the temperature of the freezing compartment 100 is affected by the ambient temperature and humidity, so that the surface of the evaporator 110 is covered with a frost layer, and the higher the ambient temperature is, the higher the heat and humidity load is, the faster the frost formation speed of the evaporator 110 is, and the greater the frost formation thickness is. Thus, the heat transfer resistance and the air flow resistance of the evaporator 110 are increased, and the convection air flowing over the surface of the evaporator 110 is reduced, so that the heat transfer coefficient of the air side of the surface of the evaporator 110 and the heat transfer coefficient of the evaporator 110 are reduced, which affects the refrigeration performance of the refrigerator. Therefore, in order to remove the frost layer on the surface of the evaporator 110 in a timely and efficient manner, for example, the freezing compartment 100 is provided with the heater 120, wherein the heater 120 is connected to the evaporator 110, and the evaporator 110 is electrically connected to the control module 400. Specifically, the heater 120 is disposed on the surface of the evaporator 110, and the control module 400 controls the heating switch of the heater 120, specifically, controls the heater 120 to start to operate by periodically turning on the heating switch of the heater 120, and controls the heater to stop operating by timely turning off the heating switch of the heater 120 according to the thickness of the frost layer on the surface of the evaporator 110, so as to achieve timely and effective removal of the frost layer on the surface of the evaporator 110.
In this embodiment, the temperature detecting module 200 includes a first detecting module 210, a second detecting module 220, and a third detecting module 230; the first detection module 210 is configured to detect the temperature of the freezing chamber, for example, the first detection module 210 includes a temperature sensor, and the temperature sensor of the first detection module 210 is disposed in the freezing chamber 100, so that the working condition of the heater in the freezing chamber 100 can be obtained in time. The second detection module 220 is used for detecting the ambient temperature, for example, the second detection module 220 includes a temperature sensor, and the temperature sensor of the second detection module 220 is installed outside the refrigerator and used for timely and accurately sensing and acquiring the ambient temperature. The third detecting module 230 is configured to detect an evaporation temperature of the refrigerant inside the evaporator, for example, the third detecting module 230 includes a temperature sensor, the temperature sensor of the third detecting module 230 is disposed on a surface of the evaporator 110, and the evaporation temperature of the refrigerant inside the evaporator 110 can be obtained in time through the temperature sensor of the third detecting module 230. The humidity detection module 300 is used to detect the humidity of the environment, for example, the humidity detection module 300 includes a humidity sensor installed outside the refrigerator for timely and accurately sensing and acquiring the humidity value of the environment. That is, the temperature detection module 200 and the humidity detection module 300 can timely detect the temperature in the freezing compartment 100, the evaporation temperature of the refrigerant inside the evaporator, and the ambient temperature and the ambient humidity, so that the heater 120 can be timely and accurately determined and started or stopped, so as to completely remove the frost layer on the surface of the evaporator 110.
For example, an evaporator defrosting method includes the following steps: detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator, and acquiring a defrosting temperature difference of the refrigerator according to the difference between the temperature of the freezing chamber and the evaporation temperature of the refrigerant in the evaporator; judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work; judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
In one embodiment, as shown in fig. 2, there is provided an evaporator defrosting method suitable for the air-cooled refrigerator in the above embodiment, which includes the following steps.
Detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator; and acquiring a defrosting temperature difference of the refrigerator according to the difference between the freezing chamber temperature and the evaporation temperature of the refrigerant in the evaporator.
In the present embodiment, the freezing compartment temperature is defined as Tc, and the internal refrigerant evaporation temperature of the evaporator is defined as ToThe defrosting temperature difference is set to △ T, namely △ T-Tc-ToThe Tc is a refrigeration temperature value of the refrigerator set by the user, and the set value is a fixed value, and the specific Tc value is detected and obtained by the first detection module 210. When the refrigerator is operated at the set temperature, the acquisition T is detected by the third detection module 230oValue of, wherein ToThe value will vary with the thickness of frost on the surface of the evaporator 110, resulting in △ T following ToWherein, according to the design experiment and the actual experiment of the air-cooled refrigerator 10, the ambient temperature detected by the second detection module 220 and the ambient humidity detected by the humidity detection module 300 both linearly change with △ T, and the cumulative operating time of the compressor of the air-cooled refrigerator 10 increases with the increase of △ T.
And judging whether the defrosting temperature difference is larger than a preset temperature difference, if so, controlling a heater of the evaporator to start to work, and otherwise, controlling the heater to stop working.
In this embodiment, the preset temperature difference is defined as △ ToWherein, △ ToThe standard value obtained by experiment in advance when designing the air-cooled refrigerator 10 for production, for example, △ T for the air-cooled refrigerator 10o3-5 deg.C, so by consulting △ ToValue, i.e. can pass through and ToThe value of Tc in the normal state is calculated and passes through △ ToCompared with △ T obtained by actual detection, the frosting condition of the evaporator 110 can be accurately judged, thereby confirming whether the heater needs to be started or stoppedThe heater is operated to achieve effective and timely removal of the frost layer on the surface of the evaporator 110. specifically, in the judgment, when △ T is not more than △ ToWhen the temperature of △ T is more than △ T, the refrigeration effect of the evaporator 110 is better, the air-cooled refrigerator 10 can be continuously in the refrigeration running state, so that the heater 120 is not required to be started for defrostingoWhen the operation is performed, it is determined that the evaporator 110 has a poor refrigeration effect, a frost layer covers the surface of the evaporator, and the air-cooled refrigerator 10 is in an abnormal operation state, and the heater 120 needs to be started in time to defrost.
Judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, if so, controlling the heater to stop working, otherwise, controlling the heater to stop working.
In this embodiment, in order to satisfy air-cooled refrigerator 10 can be at great ambient temperature scope, different ambient humidity and the non-artificial cause of user refrigerator operating condition's change, air-cooled refrigerator 10 homoenergetic normally works, and homoenergetic reaches best refrigeration effect, the fresh-keeping quality of the indoor edible material of cooling room also can be guaranteed, through control module 400 control air-cooled refrigerator 10 operates under two kinds of mode according to ambient temperature and ambient humidity: such as a mode and B mode. The mode a and the mode B are defined by the preset temperature and the preset humidity, the preset temperature is set to 38 ℃ according to the design experiment and the operation experiment of the air-cooled refrigerator 10, the preset humidity is set to 85% according to the design experiment and the operation experiment of the air-cooled refrigerator 10, when the ambient temperature exceeds 38 ℃, the air-cooled refrigerator will operate in a high-temperature environment, when the ambient humidity exceeds 85%, the air-cooled refrigerator will operate in an environment with a higher heat load, at this time, the evaporator 110 will be more prone to frost on the surface, and the frost layer on the evaporator surface cannot be completely removed through one defrosting operation of a preset program, so that the evaporator 110 needs to be defrosted for many times, that is, the heater 120 needs to be started and stopped for many times.
The starting basis of the mode a is that the ambient temperature is lower than the preset temperature and/or the ambient humidity is lower than the preset humidity, i.e., the starting conditions are divided into three kinds, for example, only when the ambient temperature is lower than the preset temperature, if again, only when the ambient humidity is lower than the preset humidity, if again, when the ambient temperature is lower than the preset temperature and the ambient humidity is lower than the preset humidity. When any one of the three conditions is met, further detecting the defrosting time of the heater 120, and judging whether the defrosting time is less than or equal to a preset defrosting time, if so, controlling the heater 120 to start to work, otherwise, controlling the heater 120 to stop working. The preset defrosting time is set to 50 minutes according to the actual running experiment of the air-cooled refrigerator 10, that is, when the heater 120 is first started to heat and defrost, the frost layer on the surface of the evaporator 110 can be completely removed within the above-mentioned ambient temperature and humidity range when the running time of the heater reaches 50 minutes. Wherein the defrosting time is detected by a corresponding detecting device in the control module 400, for example, when the detecting device detects that there is no covering of a defrosting layer on the surface of the evaporator 110, it is proved that the defrosting is finished. It should be understood that when the defrosting time is less than or equal to the preset defrosting time, it is proved that the evaporator is completely defrosted, and the heater can be taken out of operation; on the contrary, when the defrosting time is longer than the preset defrosting time, it is proved that the frost layer of the evaporator is not completely removed within the preset time, and the heater needs to be started to work continuously.
The starting base of the mode B is that the ambient temperature is greater than or equal to the preset temperature, and the ambient humidity is greater than or equal to the preset humidity, namely when the ambient temperature is greater than or equal to 38 ℃, and the ambient humidity is greater than or equal to 85%, the air-cooled refrigerator operates in a special environment, so that after the mode A is adopted to complete one defrosting operation, the defrosting operation needs to be further performed. For example, the freezer compartment temperature is detected and determined whether it is less than or equal to a preset exit temperature, if so, the heater 120 is controlled to stop operating, otherwise, the heater 120 is controlled to stop operating within a preset time. The preset exit temperature is set to-15 ℃ according to the actual operation experiment of the air-cooled refrigerator 10, that is, when the heater 120 is operated to heat and the temperature of the freezing compartment 100 reaches-15 ℃, the air-cooled refrigerator returns to normal operation without continuously heating the evaporator 110, so as to prevent the temperature of the freezing compartment 100 from rising and thus the safety quality of food from being affected.
Specifically, after the heater 120 is first activated, when the first detection module 210 detects that the temperature of the freezing compartment 100 reaches-15 ℃, the switch of the heater 120 is controlled to stop the operation of the heater 120. After the heater 120 is started for the first time, when the first detection module 210 detects that the temperature of the freezing compartment 100 exceeds-15 ℃, it indicates that the temperature of the freezing compartment 100 is high, that is, the refrigerating capacity of the evaporator 110 is low, and the surface heat transfer coefficient is small, so that it can be determined that the surface of the evaporator 110 is covered with a frost layer, and a defrosting operation is further required to be performed, so that the air-cooled refrigerator can recover to normal operation. And further, detecting whether the accumulated working time of the compressor is less than the preset time, if so, continuing to control the heater to stop working, otherwise, controlling the heater to start working, and executing the step of detecting whether the temperature of the freezing chamber is less than or equal to the preset exit temperature again. The preset time is 4 hours, that is, after the first defrosting is finished, the heater is withdrawn from operation, the compressor starts to work to enhance refrigeration, and when the compressor works for 4 hours, the compressor is obtained according to design experiments and actual operation experiments of the air-cooled refrigerator, and the air-cooled refrigerator can be recovered to a certain refrigeration capacity range, so that the preservation quality of food stored in the freezing chamber 100 is ensured. When the accumulated operation time of the compressor reaches 4 hours, which is obtained by the control module 400, the heater is restarted to start a second defrosting operation, wherein the second defrosting time is determined by detecting whether the temperature in the freezing chamber 100 reaches a preset exit temperature of-15 ℃, and the specific execution steps are consistent with the above method and rule for judging the end of the first defrosting operation in the B mode, which are not described herein again.
According to the air-cooled refrigerator and the defrosting method of the evaporator of the air-cooled refrigerator, the defrosting temperature difference of the refrigerator is obtained by detecting the temperature of the freezing chamber of the refrigerator and the evaporating temperature of the refrigerant in the evaporator and obtaining the difference, and the refrigerator is controlled to work by the heater of the evaporator under different environmental temperatures by comparing the defrosting temperature difference with the preset temperature difference. Therefore, the adaptability of the refrigerator environment is improved, the food preservation quality stored in the freezing chamber is ensured, and the energy-saving effect of the air-cooled refrigerator is also improved.
In an embodiment, the step of determining whether the ambient temperature is less than the preset temperature and/or the ambient humidity is less than the preset humidity further includes:
and acquiring the available storage volume of the freezing chamber and judging whether the available storage volume is smaller than a preset minimum volume, if so, executing the steps of detecting the temperature of the freezing chamber and judging whether the available storage volume is smaller than or equal to a preset exit temperature.
That is, the available storage volume of the freezing compartment is obtained, and whether the available storage volume is smaller than a preset minimum volume is judged, if yes, the steps in the B mode are executed.
In this embodiment, the preset minimum volume is obtained according to the size of the minimum ventilation space that the freezing compartment 100 can bear, which is obtained through a design experiment and an operation experiment of the air-cooled refrigerator, and is specifically obtained according to air-cooled refrigerators of different models, and is not specifically described herein. When the control module 400 detects that the available storage volume of the freezer compartment 100 is smaller than the preset minimum volume capable of ensuring normal operation of the air-cooled refrigerator in the process of storing food at one time through the volume detection device, it is proved that the air-cooled refrigerator enters the B mode at this time, and the step in the B mode is executed, so that the evaporator 110 of the refrigerator increases the work load and relatively reduces the refrigerating capacity of the refrigerator due to the fact that too many food are stored in the freezer compartment 100 at one time, and compared with the air-cooled refrigerator which only needs to perform defrosting operation at one time, further defrosting operation needs to be performed, so that a frost layer on the evaporator of the refrigerator can be completely removed in time, and the fresh-keeping quality of the food stored in the freezer compartment 100 is ensured.
In an embodiment, the step of determining whether the ambient temperature is less than the preset temperature and/or the ambient humidity is less than the preset humidity further includes:
and acquiring the humidity of the freezing chamber and judging whether the humidity is greater than the preset lowest humidity, if so, executing the steps of detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to the preset exit temperature.
Namely, the humidity of the freezing chamber is obtained, whether the humidity of the freezing chamber is larger than the preset lowest humidity is judged, and if yes, the step in the B mode is executed.
In this embodiment, the preset minimum humidity is obtained according to a design experiment and an operation experiment of the air-cooled refrigerator, and the minimum humidity that the freezing compartment 100 can bear is obtained, within a range smaller than the minimum humidity, the evaporator can keep normal working frosting thickness from being abnormally thickened, and is obtained specifically according to air-cooled refrigerators of different models, and no specific description is given here. When the control module 400 detects that the humidity of the freezing compartment 100 is greater than the preset minimum humidity through the volume detection device, that is, when the humidity of the freezing compartment 100 is sufficiently high, it is proved that the air-cooled refrigerator enters the B mode, the evaporator 110 of the refrigerator increases the workload due to the excessively high humidity of the freezing compartment 100, and accordingly the refrigerating capacity decreases, and compared with the air-cooled refrigerator which only needs to perform a defrosting operation once, a further defrosting operation is required, so that a frost layer on the evaporator of the refrigerator can be timely and completely removed, thereby ensuring the fresh-keeping quality of food stored in the freezing compartment 100.
For example, an air-cooled refrigerator is realized by adopting the defrosting method of the evaporator in any embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An evaporator defrosting method is characterized by comprising the following steps:
detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator, and acquiring a defrosting temperature difference of the refrigerator according to the difference between the temperature of the freezing chamber and the evaporation temperature of the refrigerant in the evaporator;
judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work;
judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
2. The evaporator defrosting method according to claim 1, wherein the defrosting time of the heater is detected and judged whether the defrosting time is less than or equal to a preset defrosting time, and if the defrosting time is less than or equal to the preset defrosting time, the heater is controlled to start to work, and the method further comprises the following steps: otherwise, controlling the heater to stop working.
3. The evaporator defrosting method according to claim 1, wherein the freezer compartment temperature is detected and judged whether or not it is less than or equal to a preset exit temperature, and if so, the heater is controlled to stop working, further comprising: otherwise, controlling the heater to stop working within a preset time.
4. The evaporator defrosting method according to claim 3, wherein the step of controlling the heater to stop operating for a preset time further comprises:
and detecting whether the accumulated working time of the compressor is less than the preset time, if so, continuing to control the heater to stop working.
5. The evaporator defrosting method according to claim 4, wherein whether the accumulated working time of the compressor is less than the preset time is detected, and if yes, the heater is continuously controlled to stop working, further comprising the following steps: otherwise, controlling the heater to start working.
6. The evaporator defrosting method according to claim 5, wherein the step of detecting that the accumulated working time of the compressor is less than the preset time, and otherwise controlling the heater to start working further comprises the following steps:
the step of detecting whether the freezer compartment temperature is less than or equal to a preset exit temperature is performed again.
7. The evaporator defrosting method according to claim 1, wherein the defrosting temperature difference is judged to be greater than a preset temperature difference, if yes, a heater of the evaporator is controlled to start, and the method further comprises the following steps: otherwise, controlling the heater to stop working.
8. The evaporator defrosting method according to claim 1, wherein the step of judging whether the ambient temperature is less than a preset temperature and/or whether the ambient humidity is less than a preset humidity further comprises:
and acquiring the available storage volume of the freezing chamber and judging whether the available storage volume is smaller than a preset minimum volume, if so, executing the steps of detecting the temperature of the freezing chamber and judging whether the available storage volume is smaller than or equal to a preset exit temperature.
9. The evaporator defrosting method according to claim 1, wherein the step of judging whether the ambient temperature is less than a preset temperature and/or whether the ambient humidity is less than a preset humidity further comprises:
and acquiring the humidity of the freezing chamber and judging whether the humidity is less than the preset lowest humidity, if so, executing the steps of detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to the preset exit temperature.
10. An air-cooled refrigerator, comprising: the refrigerator comprises a refrigerating chamber, a temperature detection module, a humidity detection module and a control module;
the freezing chamber comprises an evaporator and a heater, the heater is connected with the evaporator, and the evaporator, the temperature detection module and the humidity detection module are all electrically connected with the control module;
the temperature detection module comprises a first detection module, a second detection module and a third detection module; the first detection module is used for detecting the temperature of the freezing chamber, the second detection module is used for detecting the ambient temperature, and the third detection module is used for detecting the evaporation temperature of the refrigerant in the evaporator;
the humidity detection module is used for detecting the environment humidity;
the control module is used for detecting the temperature of a freezing chamber of the refrigerator and the evaporation temperature of a refrigerant in the evaporator, and acquiring the defrosting temperature difference of the refrigerator according to the difference between the temperature of the freezing chamber and the evaporation temperature of the refrigerant in the evaporator; judging whether the defrosting temperature difference is greater than a preset temperature difference, if so, controlling a heater of the evaporator to start to work; judging whether the ambient temperature is lower than a preset temperature and/or whether the ambient humidity is lower than a preset humidity, if so, detecting the defrosting time of the heater and judging whether the defrosting time is lower than or equal to the preset defrosting time, and if so, controlling the heater to start; and if the judgment result is negative, detecting the temperature of the freezing chamber and judging whether the temperature is less than or equal to a preset exit temperature, and if so, controlling the heater to stop working.
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| CN110440495B (en) * | 2019-08-28 | 2021-10-01 | 长虹美菱股份有限公司 | Refrigerator defrosting control method and device |
| CN112060855B (en) * | 2020-09-01 | 2022-04-08 | 珠海格力电器股份有限公司 | Cold chain transportation control device, refrigerating unit and transport tool |
| CN113587529A (en) * | 2021-08-10 | 2021-11-02 | 银都餐饮设备股份有限公司 | Defrosting control device and defrosting control system of refrigerator |
| CN115875926B (en) * | 2021-08-27 | 2023-12-01 | 合肥美的电冰箱有限公司 | Refrigerating equipment and defrosting method and device thereof |
| CN114264110B (en) * | 2021-12-21 | 2022-12-06 | 珠海格力电器股份有限公司 | Showcase control method and device and showcase |
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