CN-116499170-B - Refrigerating and freezing device and control method thereof

CN116499170BCN 116499170 BCN116499170 BCN 116499170BCN-116499170-B

Abstract

The invention relates to a refrigerating and freezing device and a control method thereof, comprising the steps of acquiring the evaporator temperature of a freezing evaporator and the room temperature in a freezing room when the refrigerating and freezing device is in the refrigerating period of the freezing room; when the evaporator temperature of the freezing evaporator is smaller than the room temperature in the freezing room, the room humidity in the freezing room is obtained through a humidity sensor, if the room humidity in the freezing room is kept at the preset highest humidity all the time in the first preset time, the room humidity in the freezing room is obtained through the humidity sensor again after the running frequency of the compressor is increased, if the room humidity in the freezing room obtained again is still the preset highest humidity, the humidity sensor is judged to be frozen, and after the refrigerating of the freezing room is finished, the temperature sensor is subjected to defrosting treatment. The invention can accurately judge whether the humidity sensor is frozen, reduce or prevent the possibility of misjudgment, and timely perform defrosting treatment on the humidity sensor so as to facilitate the subsequent humidity control.

Inventors

LI TAO
CUI ZHANPENG
WANG MING

Assignees

青岛海尔电冰箱有限公司
海尔智家股份有限公司

Dates

Publication Date: 20260512
Application Date: 20220118

Claims (10)

1. A control method of a refrigerating and freezing apparatus including a cabinet having a freezing compartment defined therein and a compression refrigeration system including a compressor for compressing a refrigerant and a freezing evaporator for providing cold to the freezing compartment, the control method comprising: acquiring an evaporator temperature of the freezing evaporator and a compartment temperature in the freezing compartment when the refrigeration and freezing device is in a freezing compartment refrigeration period; when the evaporator temperature of the freezing evaporator is smaller than the compartment temperature in the freezing compartment, obtaining the compartment humidity in the freezing compartment through the humidity sensor; if the room humidity in the freezing room is kept at the preset highest humidity all the time within the first preset time, the running frequency of the compressor is increased, and then the room humidity in the freezing room is obtained through the humidity sensor again; if the acquired room humidity in the freezing room is still the preset highest humidity, judging that the humidity sensor is frozen, and And after the refrigeration of the refrigeration compartment is finished, performing defrosting treatment on the humidity sensor.
2. The control method according to claim 1, wherein after determining that the humidity sensor is frozen, the control method further comprises: and reducing the temperature of a shutdown point of the refrigeration freezing device in the refrigeration process of the freezing compartment.
3. The control method according to claim 1, wherein the step of thawing the humidity sensor includes: and starting a heating device, and releasing heat to the humidity sensor through the heating device.
4. The control method according to claim 1, wherein the step of thawing the humidity sensor includes: judging whether a defrosting starting condition for defrosting the freezing evaporator is reached; if the defrosting starting condition is reached, immediately starting a heating device to release heat to the humidity sensor through the heating device; If the defrosting starting condition is not met, judging whether the time for reaching the defrosting starting condition is longer than a second preset duration; if yes, immediately starting the heating device; If not, waiting to start the heating device when the defrosting starting condition is met.
5. The control method of claim 4, wherein the defrost initiation condition comprises any one or more of: the time interval from the last defrosting of the freezing evaporator reaches the preset maximum defrosting time; the accumulated running time of the compressor reaches a third preset time; and the accumulated door opening time of the freezing door body corresponding to the freezing compartment reaches a fourth preset time.
6. The control method according to claim 1, further comprising: Judging whether the absolute value of the difference between the acquired room humidity in the freezing room and the preset highest humidity is within a first preset range or not; if yes, judging that the humidity sensor is normal; If not, judging that the humidity sensor fails.
7. The control method according to claim 1, further comprising: Judging whether the absolute value of the difference between the acquired room humidity in the freezing room and the preset highest humidity is within a first preset range or not; if yes, judging that the humidity sensor is normal; If not, the operation frequency of the compressor is further improved, the room humidity in the freezing room is obtained through the humidity sensor again, if the absolute value of the difference between the room humidity in the freezing room obtained again and the room humidity in the freezing room obtained last time is in a second preset range, the humidity sensor is judged to be normal, and otherwise, the humidity sensor is judged to be faulty.
8. The control method according to claim 1, further comprising, after the defrosting process is performed on the humidity sensor: Acquiring the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment during the next freezing compartment refrigeration; when the evaporator temperature of the freezing evaporator is smaller than the compartment temperature in the freezing compartment, obtaining the compartment humidity in the freezing compartment through a humidity sensor; if the room humidity in the freezing room is still the preset highest humidity, judging that the humidity sensor fails; and if the room humidity in the freezing room is smaller than the preset highest humidity, judging that the humidity sensor is normal.
9. The control method according to claim 7 or 8, after determining that the humidity sensor has failed, the control method further comprising: And sending out an alarm signal for prompting the humidity sensor to fail.
10. A refrigeration chiller including a housing defining a refrigeration compartment therein and a compression refrigeration system including a compressor for compressing a refrigerant and a refrigeration evaporator for providing refrigeration to the refrigeration compartment, the refrigeration chiller further comprising: a humidity sensor for acquiring the humidity of the refrigerating compartment and Control device comprising a processor and a memory, said memory having stored therein a machine executable program, and said machine executable program when executed by said processor being adapted to carry out the control method according to any one of claims 1-9.

Description

Refrigerating and freezing device and control method thereof Technical Field The present invention relates to a refrigeration technology, and more particularly, to a refrigeration and freezing apparatus and a control method thereof. Background The humidity in the refrigerating and freezing device can influence the evaporation speed of the water in the food materials, thereby influencing the quality of the food materials. When the humidity is too low, the water of the food material evaporates faster, which causes weight loss of the food material, and then causes the problems of poor food storage effect, shorter food preservation period and the like. Therefore, it is always a critical research topic to keep the refrigerating and freezing apparatus wet. However, most of the conventional refrigerating and freezing apparatuses humidify and moisturize the refrigerating chamber, and there is little concern about humidification and moisturization of the freezing chamber. In fact, the air-cooled refrigeration and freezing device generally has the problem that the humidity fluctuation is large during the freezing and refrigerating period, the humidity fluctuation and the humidity are low, and food stored in the freezing chamber can lose water, so that the taste of the food is affected, nutrition loss is caused, and the user experience is affected. Humidity sensors are commonly used in the prior art to detect real-time humidity in a freezer compartment to facilitate control of humidification. However, the temperature in the freezing chamber is very low, water vapor in the freezing chamber is easy to condense into ice, and if the ice layer is condensed at the humidity sensor, certain influence can be generated on the detection performance and the detection precision of the humidity sensor, so that the subsequent humidification control is influenced, and the humidity control is inaccurate. Those skilled in the art have not recognized the existence of the above-mentioned technical problems at all, and still have attempted to solve the problem of inaccurate humidity control from the standpoint of a specific humidification strategy, and the effect is not ideal. Disclosure of Invention An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the prior art, and to provide a control method of a refrigerating and freezing apparatus capable of accurately detecting whether a humidity sensor is frozen and timely thawing the humidity sensor. A further object of the first aspect of the invention is to avoid that the thawing treatment of the humidity sensor has a large influence on the temperature of the freezer compartment. The second aspect of the present invention is to provide a refrigerating and freezing apparatus capable of accurately detecting whether a humidity sensor is frozen or not and timely thawing the humidity sensor. According to a first aspect of the present invention, there is provided a control method of a refrigerating and freezing apparatus including a cabinet having a freezing compartment defined therein, a humidity sensor for detecting a compartment humidity therein, and a compression refrigeration system including a compressor for compressing a refrigerant and a freezing evaporator for providing cooling capacity to the freezing compartment, the control method comprising: acquiring an evaporator temperature of the freezing evaporator and a compartment temperature in the freezing compartment when the refrigeration and freezing device is in a freezing compartment refrigeration period; when the evaporator temperature of the freezing evaporator is smaller than the compartment temperature in the freezing compartment, obtaining the compartment humidity in the freezing compartment through a humidity sensor; if the room humidity in the freezing room is kept at the preset highest humidity all the time within the first preset time, the running frequency of the compressor is increased, and then the room humidity in the freezing room is obtained through the humidity sensor again; if the acquired room humidity in the freezing room is still the preset highest humidity, judging that the humidity sensor is frozen, and And after the refrigeration of the refrigeration compartment is finished, performing defrosting treatment on the humidity sensor. Optionally, after determining that the humidity sensor is frozen, the control method further includes: and reducing the temperature of a shutdown point of the refrigeration freezing device in the refrigeration process of the freezing compartment. Optionally, the step of thawing the humidity sensor includes: and starting a heating device, and releasing heat to the humidity sensor through the heating device. Optionally, the step of thawing the humidity sensor includes: judging whether a defrosting starting condition for defrosting the freezing evaporator is reached; if the defrosting starting condition is reached, immediately starting a heati