CN109425168B - Refrigeration appliance and control method thereof - Google Patents
Refrigeration appliance and control method thereof Download PDFInfo
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- CN109425168B CN109425168B CN201710784619.XA CN201710784619A CN109425168B CN 109425168 B CN109425168 B CN 109425168B CN 201710784619 A CN201710784619 A CN 201710784619A CN 109425168 B CN109425168 B CN 109425168B
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- evaporator
- humidity
- defrosting
- refrigeration appliance
- humidity sensor
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- 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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/023—Set point defrosting
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/02—Humidity
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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
- F25D2600/00—Control issues
- F25D2600/02—Timing
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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
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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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
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/10—Sensors measuring the temperature of the evaporator
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a refrigeration appliance, comprising: a storage compartment for storing articles; an evaporator chamber communicable with the storage chamber, in which an evaporator for cooling air is disposed; the air cooled by the evaporator may circulate between the storage chamber and an evaporator chamber; a humidity sensor for detecting a humidity of the wind; the humidity sensor is disposed at a downstream position of the evaporator in a wind flowing direction. Therefore, other control is carried out according to the detected humidity, for example, a more accurate time point for starting defrosting of the evaporator is determined based on the detected humidity or the change of the detected humidity, and the defrosting efficiency of the evaporator is improved. In addition, the invention also provides a control method of the refrigeration appliance.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to a household refrigerator and a control method thereof.
Background
In the household refrigerator, frost is inevitably formed on the evaporators of the refrigerating chamber and the freezing chamber during use, so that it is necessary to periodically activate the heater installed on the evaporator to defrost the evaporator and discharge the defrost water through the drain line. Accordingly, the operation control of the refrigerator includes a refrigeration cycle for refrigerating the storage chamber and a defrosting cycle for defrosting the evaporator.
The defrosting control in the frost-free refrigerator is usually timing defrosting, and the timing defrosting can start to defrost when the frost on the surface of an evaporator is very little, which causes waste of energy. Furthermore, another drawback of the above method is: in a wet season, a user opens the door more times, a lot of frost is accumulated on the evaporator, but the refrigerator does not start defrosting before the specified defrosting time, and the refrigerating performance of the refrigerator is seriously influenced. In order to overcome the defect of timed defrosting, some improved defrosting control methods control defrosting according to factors such as the power-on time of a refrigerator, the working time of a compressor, the door opening times, the ambient temperature and the like. Although the defrosting efficiency is improved to a certain extent by the defrosting control methods, the consideration factors are many, and the program logic is complex.
Disclosure of Invention
The invention solves the problem of how to accurately and timely defrost in the running process of the refrigerator.
To solve the above problems, in one aspect, the present invention provides a refrigerator including: a storage compartment for storing articles; an evaporator chamber communicable with the storage chamber, in which an evaporator for cooling air is disposed; the air cooled by the evaporator may circulate between the storage chamber and an evaporator chamber; a humidity sensor for detecting a humidity of the wind; the humidity sensor is disposed at a downstream position of the evaporator in a wind flowing direction.
The humidity of the wind refers to the humidity of the wind circulating between the storage chamber and the evaporator.
The efficiency of defrosting the evaporator is improved by arranging a humidity sensor at a position downstream of the evaporator to detect the humidity of the wind after flowing through the evaporator, so that other control is performed according to the detected humidity, for example, a more accurate time point for starting defrosting the evaporator is determined based on the detected humidity or the change of the detected humidity.
As a further improvement of the present invention, the refrigeration appliance further comprises a control unit connected to the humidity sensor, the control unit controlling the start of defrosting of the evaporator based on the humidity detected by the humidity sensor.
The frosting condition of the evaporator can be directly and accurately judged based on detecting the humidity or the humidity change of the downstream position of the evaporator, and the starting time point of defrosting of the evaporator is accurately controlled. Thereby avoiding unnecessary defrosting and saving energy; and defrosting can be started in time under the condition of defrosting requirement, so that the working efficiency of the refrigerating system is improved. In addition, the control of the start of defrosting based on the single factor of humidity is simpler in control logic.
As a further improvement of the present invention, a temperature sensor for detecting a temperature of the evaporator is further included, and the control unit controls the end of defrosting of the evaporator based on the temperature detected by the temperature sensor.
As a further refinement of the invention, the control unit is arranged to: and when the continuous defrosting time of the evaporator reaches the preset time, the control unit controls to finish defrosting of the evaporator.
As a further improvement of the present invention, the humidity sensor is disposed at a position close to a downstream of the evaporator.
The position close to the downstream of the evaporator refers to the position where the wind energy passing through the evaporator is detected by the humidity sensor in time, and the humidity of the wind at the position is not attenuated or disturbed, so that the humidity of the wind just passing through the evaporator can be truly reflected. The frosting degree of the evaporator can be directly and accurately judged based on the humidity of the wind at the position, so that the starting time point of defrosting can be accurately judged.
As a further improvement of the invention, the humidity sensor is arranged on a wall of the evaporator chamber.
As a further improvement of the invention, the humidity sensor is arranged at the air outlet of the evaporator chamber.
The air outlet of the evaporator chamber refers to an outlet of the evaporator chamber communicated with other air ducts or air duct components, the air ducts comprise refrigerating chamber air ducts or freezing chamber air ducts, and the air duct components comprise air doors and the like.
The evaporator chamber is a chamber independently constructed in the air path system and provided with an air inlet or an air outlet; or the air outlet is a part of an air duct in the air duct system, in this case, the air outlet may be an air outlet configured to communicate the air duct with the storage chamber.
As a further improvement of the present invention, a fan for circulating the blowing wind is further included, the fan being disposed at a position downstream of the evaporator in a flow direction of the wind; the humidity sensor is arranged at a position between the evaporator and the fan or at a downstream position of the fan and close to the fan or above the fan.
As a further improvement of the present invention, the fan is disposed at a position downstream of the evaporator and close to the evaporator.
Another aspect of the present invention provides a control method of a refrigeration appliance, wherein the refrigeration appliance includes: a storage compartment for storing articles; an evaporator chamber communicable with the storage chamber, in which an evaporator for cooling air is disposed; the air cooled by the evaporator may circulate between the storage chamber and an evaporator chamber; a humidity sensor for detecting a humidity of the wind; the control method comprises the following steps: controlling the start of defrosting of the evaporator based on the humidity detected by the humidity sensor.
As a further improvement of the present invention, the control method includes the steps of: controlling the start of defrosting of the evaporator based on a change in the humidity detected by the humidity sensor.
As a further improvement of the present invention, wherein the refrigeration appliance comprises: the temperature sensor for detecting the temperature of the evaporator includes; the control method comprises the following steps: controlling the end of defrosting the evaporator based on the temperature detected by the temperature sensor.
As a further improvement of the present invention, the control method includes the steps of: and when the continuous defrosting time of the evaporator reaches the preset time, the control unit controls to finish defrosting of the evaporator.
As a further improvement of the present invention, the humidity sensor is adapted to detect the humidity of the wind at a position downstream of the evaporator in the wind flowing direction.
As a further improvement of the present invention, said controlling the start of defrosting of said evaporator based on a change in humidity detected by said humidity sensor further comprises the steps of:
controlling the start of next defrosting of the evaporator based on the comparison result of the humidity average value H2 detected by the humidity sensor within a second preset time period t2 after the last defrosting of the evaporator is finished and a preset humidity value H1.
The humidity average value means that a plurality of humidity values are uniformly detected in a second preset time period, and then the humidity values are averaged.
As a further improvement of the invention, the preset humidity value H1 is an average value of the humidity detected by the humidity sensor within a first preset time period t1 immediately after the last defrosting of the evaporator is finished or is an initial preset value.
The average value of the humidity in the first preset time period is to uniformly detect a plurality of humidity values in the first preset time period and then to average the plurality of humidity values. So that the preset humidity value can be changed with different defrosting periods.
The initial preset value is a fixed value preset when the refrigerator leaves a factory.
As a further improvement of the invention, the starting point in time of the second time period t2 is further away from the point in time when the last defrosting of the evaporator was finished as time goes on.
As a further development of the invention, the humidity average H2 is variable over time.
As a further development of the invention, the starting point of the second time period t2 is later than the point of time when the last defrosting of the evaporator is finished.
As a further development of the invention, when said humidity average value H2 is smaller than said preset humidity value H1 by a preset reference value Δ H, the next defrosting of said evaporator is started.
For example, H1 and H2 both use relative humidity, and when H2 is 8-10% smaller than H1, the next defrosting of the evaporator is started.
Drawings
Fig. 1 is a schematic longitudinal cut view of a refrigerator according to an embodiment of the present invention;
FIG. 2 is an enlarged fragmentary view of a portion of the evaporator chamber of FIG. 1;
FIG. 3 is a flow chart for controlling evaporator defrost based on humidity detected by the humidity sensor;
fig. 4 is a schematic diagram of the second time period t2 being shifted along the time axis in the same process of determining whether to start defrosting the evaporator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the present invention is described by taking an example in which the refrigeration appliance is implemented as a household two-door refrigerator, but the present invention is not limited to only two-door refrigerators, and can also be applied to three-door refrigerators, side-by-side refrigerators, multi-door refrigerators, and the like. FIG. 1 is a schematic longitudinal plane view of a refrigerator according to an embodiment of the present invention. As shown in fig. 1, the internal space of the refrigerator 100 is partitioned by a partition wall 8 into two compartments independent of each other, i.e., a first compartment 1 and a second compartment 2, respectively. The first door 11 and the second door 21 independently close the two compartments, respectively. The refrigerating temperature of the first compartment 1 is set to be higher than zero degree, and the second compartment 2 located below the first compartment 1 is set as a freezing compartment. Below the partition wall 8 is provided an evaporator chamber 4, in which evaporator chamber 4 an evaporator 5 and a fan 6 are installed. The fan 6 is disposed adjacent to the evaporator 5 at a position downstream of the evaporator 5 in the circulating flow direction of the wind. The first air duct 7 communicating with the evaporator chamber 4 is provided inside the insulation layer 102 of the refrigerator, especially in the insulation layer behind the rear wall inside the first compartment 1, so that the first air duct 7 does not occupy the effective storage space inside the first compartment 1, improving the space utilization inside the first compartment 1. After being cooled by the evaporator 5, the wind enters the first compartment 1 along the first air duct 5 by the blowing of the fan 6.
A return air opening 12 is provided in the first compartment 1. The cold air is supplied to the return air passage (not shown) through the return air inlet 12 and returned to the evaporator compartment 4 after cooling the stored items in the first compartment 1. The evaporator compartment 4 is provided with an air inlet 41 communicating with the return air passage, and the air is circulated back into the evaporator compartment 4 through the air inlet 41 and is cooled by the evaporator 5 to enter the next air circulation.
Part of the cold air from the evaporator compartment 4 will pass down a second air duct (not shown) into the second compartment 2, which is provided as a freezer compartment, and will be routed to a specific area of the freezer compartment for cooling the frozen goods.
The refrigerator 100 has a cooling and defrosting system, and a control unit controlling the cooling and defrosting system, as well as an evaporator temperature sensor for detecting an evaporator temperature and a humidity sensor (not shown) for detecting a humidity of wind cooled by the evaporator 5. Wherein the refrigeration and defrosting system includes a compressor (not shown), an evaporator 5, a fan 6, a defrosting heater (not shown), and the like. The defrosting heater can be a common electric heating wire which is adjacently connected and fixed with the fin of the evaporator and the refrigerant pipeline. The evaporator temperature sensor may be arranged on the evaporator to detect the temperature of the evaporator, the humidity sensor is preferably arranged at a position downstream of the evaporator to detect the humidity change of wind passing through the evaporator, and the temperature and the humidity detected by the two sensors are fed back to the control circuit board of the control unit for processing. The control unit sends corresponding control signals to the compressor 3, the evaporator 5, the fan 6, the defrosting heater and other elements according to the processing result, so that the refrigeration of the storage room and the defrosting of the evaporator 5 are controlled.
In order to accurately and timely detect the humidity of the wind that has just passed through the evaporator 5 and flows downstream, the humidity sensor is preferably disposed at a downstream position or area adjacent to the evaporator 5. Fig. 2 is a partially enlarged view of a portion of the evaporator chamber in fig. 1, and as shown in fig. 2, a fan is provided in the evaporator chamber 4 in a downstream area of the evaporator 5 and in proximity to the evaporator 5. The moisture sensor 3 is arranged just in the area between the evaporator 5 and the fan 6, in particular on the side of the evaporator chamber 4 of this area. Thus, under the action of the fan 6, the air circularly flows and passes through the humidity sensor 3 after passing through the evaporator 5, so that the humidity sensor 3 can timely detect the humidity and the change of the air after passing through the evaporator 5, the frosting degree of the evaporator 5 is accurately judged based on the detected humidity change, and an accurate judgment basis is provided for whether the next evaporator defrosting is started or not.
Regarding the location of the humidity sensor, it should be easily understood by those skilled in the art that the location of the humidity sensor is preferable as long as the humidity sensor can timely and quickly detect the humidity of the wind flowing in the downstream direction and just passing through the evaporator. For example, the humidity sensor may also be disposed directly above the fan; or in the case where the fan is configured as an axial fan, the humidity sensor may be disposed downstream of the fan and adjacent to the fan; or the humidity sensor is arranged on a channel or an air outlet which is communicated with the evaporator chamber and other first air channels and second air channels. The above examples are all located very close to the downstream end of the evaporator.
The refrigerator generally starts a defrosting procedure according to a predetermined defrosting cycle, and a time interval between two defrosting procedures can be set as a fixed time interval or a time interval which can be automatically adjusted according to the use and operation conditions of the refrigerator.
FIG. 3 is a flow chart for controlling evaporator defrost based on humidity detected by the humidity sensor. As shown in fig. 3, the refrigerator is factory-set, that is, a preset humidity value H1 is assigned as a preset initial value, which is used as a judgment parameter for judging whether to start defrosting of the evaporator for the first time after the refrigerator starts to operate. During the subsequent normal operation of the refrigerator, the humidity sensor continuously detects the humidity of the position or area close to the downstream end of the evaporator, calculates the average value of the humidity within a second preset time period t2 as H2, compares the average value of the humidity H2 with the preset humidity value H1, and further judges whether to start the next defrosting of the evaporator according to the comparison result. If H2 reaches a preset reference value Δ H less than H1, the control unit initiates the next defrosting of said evaporator.
In the next defrosting process, the temperature sensor detects the temperature of the evaporator in real time, and whether defrosting of the evaporator is stopped is judged according to the detected temperature result; and if the temperature of the evaporator reaches the preset maximum temperature, the control unit controls the evaporator to defrost. Meanwhile, whether defrosting of the evaporator is stopped or not is judged according to the duration time of next defrosting, and if the duration time of defrosting reaches the maximum preset time, the control unit also controls the evaporator to finish defrosting. During a first preset time period t1 immediately after defrosting of the evaporator is finished, the humidity sensor continuously detects the humidity of a position or an area close to the downstream end of the evaporator, then the average value of the humidity within the first preset time period t1 is calculated, and the average value of the humidity is given to H1 as a new preset humidity value to replace the original preset initial value to serve as a judgment parameter for judging whether defrosting of the evaporator is started or not at the next time. During the next second time period t2 after the defrosting of the evaporator is finished, the humidity sensor continuously detects the humidity of the position or the area close to the downstream end of the evaporator, and the average value H2 of the humidity in the next second preset time period t2 is calculated, so that the next new defrosting start judgment of the evaporator is carried out.
The average value of the humidity in the first preset time period t1 is that the humidity sensor uniformly detects the humidity of the position or the area close to the downstream end of the evaporator in the first preset time period t1 and obtains a plurality of humidity values, and then the average value of the plurality of humidity values is obtained, for example, the first preset time period t1 is set to 2 hours, the humidity sensor detects every 1 minute to obtain 1 humidity value, and obtains 120 humidity values in 2 hours, and then the average value of the 120 humidity values is obtained as the average value of the humidity in the first preset time period t1 and is used as the preset humidity value H1. It can be seen that every time the evaporator is defrosted, the preset humidity value H1 is re-assigned accordingly, so that H1 may be changed in different defrosting cycles.
Similarly, the average value of the humidity in the second preset time period t2 means that the humidity sensor uniformly detects the humidity of the position or the area close to the downstream end of the evaporator in the second preset time period t2 and obtains a plurality of humidity values, and then averages the plurality of humidity values.
Fig. 4 is a schematic diagram of the second time period t2 being shifted along the time axis in the same process of determining whether to start defrosting the evaporator. The time point at which the defrosting of the evaporator is finished the previous time is the starting time point 0, that is, the time starting point of the first preset time period t1 is 0, and the humidity average value H1 is obtained within the t 1. The humidity average H2 is then obtained again for a second preset time period t2 after the starting time point 0 to compare with H1. The start time point of the second preset time period t2 does not coincide with the start time point 0, i.e., is later than the start time point 0, while the start time point of the second preset time period t2 is more and more distant from the start time point 0 as time progresses. Different humidity average values H2 were obtained at t2 at different positions on the time axis to constantly compare with H1. It can be seen that H1 is constant during the same determination of whether to initiate evaporator defrost, but H2 may be constant over time and may generally have a decreasing trend.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (19)
1. A refrigeration appliance comprising:
storage compartments (1,2) for storing articles;
an evaporator chamber (4) communicable with the storage compartments (1,2), an evaporator (5) for cooling air being provided in the evaporator chamber (4); the air cooled by the evaporator (5) can circulate between the storage compartments (1,2) and an evaporator compartment (4);
a humidity sensor (3) for detecting the humidity of the wind;
characterized in that the humidity sensor (3) is arranged at a downstream position of the evaporator (5) in the wind flowing direction; the defrosting control device is characterized by further comprising a control unit connected with the humidity sensor (3), wherein the control unit controls the start of defrosting of the evaporator based on the humidity detected by the humidity sensor (3).
2. The refrigeration appliance according to claim 1, further comprising a temperature sensor for detecting the temperature of said evaporator (5), said control unit controlling the end of defrosting of said evaporator based on the temperature detected by said temperature sensor.
3. The refrigeration appliance according to claim 1, wherein said control unit is arranged to: when the continuous defrosting time of the evaporator (5) reaches the preset time, the control unit controls the end of defrosting of the evaporator (5).
4. The refrigeration appliance according to claim 1, wherein said humidity sensor (3) is arranged in proximity to a downstream position of said evaporator (5).
5. The refrigeration appliance according to claim 4, characterized in that the humidity sensor (3) is arranged on a wall of the evaporator chamber (4).
6. Refrigeration appliance according to claim 4, characterized in that the humidity sensor (3) is arranged at the outlet of the evaporator chamber (4).
7. The refrigeration appliance according to claim 1, further comprising a fan (6) for circulating the blowing wind, the fan (6) being disposed at a position downstream of said evaporator (5) in a flow direction of the wind; the humidity sensor (3) is arranged at a position between the evaporator (5) and the fan (6) or the humidity sensor (3) is arranged at a downstream position of the fan (6) and is close to the fan (6) or the humidity sensor (3) is arranged above the fan (6).
8. The refrigeration appliance according to claim 7, wherein said fan (6) is arranged in a position downstream of said evaporator (5) and close to said evaporator (5).
9. A control method of a refrigeration appliance, wherein the refrigeration appliance includes: a storage compartment for storing articles; an evaporator chamber communicable with the storage chamber, in which an evaporator for cooling air is disposed; the air cooled by the evaporator may circulate between the storage chamber and an evaporator chamber; a humidity sensor for detecting a humidity of the wind at a position downstream of the evaporator in a wind flowing direction; the control method comprises the following steps:
controlling the start of defrosting of the evaporator based on the humidity detected by the humidity sensor.
10. The control method of a refrigeration appliance according to claim 9, comprising the steps of: controlling the start of defrosting of the evaporator based on a change in the humidity detected by the humidity sensor.
11. The control method of a refrigeration appliance according to claim 9 or 10, wherein the refrigeration appliance comprises: the temperature sensor for detecting the temperature of the evaporator includes; the control method comprises the following steps: controlling the end of defrosting the evaporator based on the temperature detected by the temperature sensor.
12. The control method of a refrigeration appliance according to claim 9 or 10, characterized by comprising the steps of: and when the continuous defrosting time of the evaporator reaches the preset time, the control unit controls to finish defrosting of the evaporator.
13. The control method for a refrigeration appliance according to claim 9 or 10, wherein the downstream position is close to the evaporator.
14. The method of controlling a refrigeration appliance according to claim 10, wherein said controlling the start of defrosting of the evaporator based on the change in the humidity detected by the humidity sensor further comprises the steps of: controlling the start of next defrosting of the evaporator based on the comparison result of the humidity average value H2 detected by the humidity sensor within a second preset time period t2 after the last defrosting of the evaporator is finished and a preset humidity value H1.
15. The control method of a refrigerator as claimed in claim 14, wherein the preset humidity value H1 is an average value of the humidity detected by the humidity sensor or an initial preset value within a first preset time period t1 immediately after the last defrosting of the evaporator is finished.
16. The control method of a refrigeration appliance according to claim 14 or 15, wherein the starting time point of the second preset time period t2 is distant from the time point of the last defrosting of the evaporator with the passage of time.
17. The method as claimed in claim 16, wherein the humidity average H2 is variable over time.
18. The control method of a refrigeration appliance according to claim 14 or 15, wherein the starting point of the second preset time period t2 is later than the point of time when the last defrosting of the evaporator is finished.
19. The control method of a refrigeration appliance according to claim 14 or 15, characterized in that the next defrosting of the evaporator is started when the humidity average value H2 is smaller than the preset humidity value H1 by a preset reference value Δ H.
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