WO2023138319A1

WO2023138319A1 - Refrigerating and freezing apparatus and control method therefor

Info

Publication number: WO2023138319A1
Application number: PCT/CN2022/142356
Authority: WO
Inventors: 李涛; 崔展鹏; 王铭
Original assignee: 青岛海尔电冰箱有限公司; 海尔智家股份有限公司
Priority date: 2022-01-18
Filing date: 2022-12-27
Publication date: 2023-07-27
Also published as: CN116499170A

Abstract

A refrigerating and freezing apparatus and a control method therefor. The control method comprises: during the cooling of a freezing compartment of a refrigerating and freezing apparatus, acquiring an evaporator temperature of a freezing evaporator and a compartment temperature in the freezing compartment; when the evaporator temperature of the freezing evaporator is lower than the compartment temperature in the freezing compartment, acquiring a compartment humidity in the freezing compartment by means of a humidity sensor; if the compartment humidity in the freezing compartment is kept at a preset highest humidity all the time within a first preset duration, increasing the operation frequency of a compressor, and then acquiring the compartment humidity in the freezing compartment by means of the humidity sensor again; if the compartment humidity in the freezing compartment that is acquired again is still the preset highest humidity, determining that the humidity sensor is frozen; and performing thawing treatment on the humidity sensor after the cooling of the freezing compartment is finished. By means of the present invention, whether the humidity sensor is frozen can be accurately determined, such that the possibility of misjudgment is reduced or prevented, and the humidity sensor is subjected to thawing treatment in a timely manner, thereby facilitating subsequent humidity control.

Description

Refrigerating and freezing device and control method thereof

technical field

The invention relates to refrigeration and freezing technology, in particular to a refrigeration and freezing device and a control method thereof.

Background technique

The level of humidity in the refrigerating and freezing device will affect the speed of moisture evaporation of the ingredients, thereby affecting the quality of the ingredients. When the humidity is too low, the water in the ingredients evaporates quickly, which will cause the weight loss of the ingredients, which in turn leads to problems such as poor food storage effect and short food preservation period. Therefore, moisturizing the refrigerated freezer is always a crucial research topic. However, most of the current refrigerating and freezing devices humidify and moisturize the refrigerator compartment, and pay little attention to the problem of humidifying and moisturizing the freezer compartment. In fact, air-cooled refrigerating and freezing devices generally have the problem of large humidity fluctuations during the freezing and cooling period. Humidity fluctuations and low humidity will cause the food materials stored in the freezer to lose water, which will affect the taste of the food materials. It will also cause the loss of nutrition and affect the user experience.

In the prior art, a humidity sensor is commonly used to detect the real-time humidity in a freezer room, so as to control humidification. However, the temperature in the freezer is very low, and the water vapor in it is easy to condense into ice. If the ice layer condenses on the humidity sensor, it will have a certain impact on the detection performance and detection accuracy of the humidity sensor, which in turn will affect the subsequent humidification control, resulting in inaccurate humidity control. However, those skilled in the art do not realize the existence of the above-mentioned technical problems at all, and still try to solve the problem of inaccurate humidity control from a specific humidification strategy, and the effect is not satisfactory.

Contents of the invention

An object of the first aspect of the present invention is to overcome at least one defect of the prior art, and provide a control method for a refrigerating and freezing device that can accurately detect whether the humidity sensor is frozen and defrost the humidity sensor in time.

A further object of the first aspect of the present invention is to prevent the temperature of the freezing compartment from being greatly affected by the thawing process of the humidity sensor.

The object of the second aspect of the present invention is to provide a refrigerating and freezing device capable of accurately detecting whether the humidity sensor is frozen and defrosting the humidity sensor in time.

According to a first aspect of the present invention, the present invention provides a control method for a refrigerating and freezing device. The refrigerating and freezing device includes a cabinet and a compression refrigeration system. The cabinet is defined with a freezer compartment, and the freezer compartment is provided with a humidity sensor for detecting the humidity of the compartment therein. The compression refrigeration system includes a compressor for compressing refrigerant and a refrigerating evaporator for providing cooling capacity for the freezer compartment; the control method includes:

When the refrigerating and freezing device is in the cooling period of the freezing compartment, obtaining the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment;

When the evaporator temperature of the refrigerated evaporator is lower than the temperature of the compartment in the refrigerated compartment, the humidity of the compartment in the refrigerated compartment is acquired by a humidity sensor;

If the compartment humidity in the refrigerated compartment remains at the preset maximum humidity within the first preset period of time, increase the operating frequency of the compressor and obtain the compartment humidity in the refrigerated compartment again through the humidity sensor;

If the compartment humidity in the freezer compartment obtained again is still the preset maximum humidity, it is determined that the humidity sensor is frozen; and

Thawing treatment is performed on the humidity sensor after the cooling of the freezing compartment is completed.

Optionally, after determining that the humidity sensor is frozen, the control method further includes:

Reduce the shutdown point temperature of the refrigerating and freezing device in the refrigerating process of the freezing compartment.

Optionally, the step of thawing the humidity sensor includes:

Start the heating device, and release heat to the humidity sensor through the heating device.

Optionally, the step of thawing the humidity sensor includes:

judging whether the defrosting start condition for defrosting the refrigerated evaporator is met;

If the defrosting start condition is reached, start the heating device immediately to release heat to the humidity sensor through the heating device;

If the defrosting start condition is not met, it is judged whether the time from reaching the defrosting start condition is greater than a second preset duration;

If so, then immediately start the heating device;

If not, wait until the defrosting start condition is met before starting the heating device.

Optionally, the defrosting start conditions include any one or more of the following:

The time interval from the last defrosting of the freezing evaporator reaches the preset maximum frosting time;

The accumulative running time of the compressor reaches a third preset time;

The accumulative door opening time of the freezing door body corresponding to the freezing compartment reaches a fourth preset time length.

Optionally, the control method also includes:

judging whether the absolute value of the difference between the compartment humidity in the freezer compartment and the preset maximum humidity obtained again is within a first preset range;

If so, then determine that the humidity sensor is normal;

If not, it is determined that the humidity sensor is faulty.

Optionally, the control method also includes:

judging whether the re-acquired absolute value of the difference between the compartment humidity in the freezing compartment and the preset maximum humidity is within a first preset range;

If so, then determine that the humidity sensor is normal;

If not, further increase the operating frequency of the compressor, and acquire the humidity of the compartment in the refrigerated compartment again through the humidity sensor. If the absolute value of the difference between the humidity of the compartment in the refrigerated compartment acquired again and the humidity of the compartment in the refrigerated compartment acquired last time is within a second preset range, it is determined that the humidity sensor is normal; otherwise, it is determined that the humidity sensor is faulty.

Optionally, after the humidity sensor is defrosted, the control method further includes:

During the next refrigerating period of the refrigerated compartment, obtaining the evaporator temperature of the refrigerated evaporator and the compartment temperature in the refrigerated compartment;

If the compartment humidity in the freezer compartment is still the preset maximum humidity, it is determined that the humidity sensor is faulty;

If the compartment humidity in the freezer compartment is lower than the preset maximum humidity, it is determined that the humidity sensor is normal.

Optionally, after determining that the humidity sensor is faulty, the control method further includes:

An alarm signal for prompting failure of the humidity sensor is issued.

According to the second aspect of the present invention, the present invention also provides a kind of refrigerating and freezing device, comprising a box body and a compression refrigeration system, wherein a freezing compartment is defined in the box, and the compression refrigeration system includes a compressor for compressing refrigerant and a freezing evaporator for providing cooling capacity for the freezing compartment, and the refrigeration and freezing device further includes:

a humidity sensor for obtaining compartment humidity in the freezer compartment; and

The control device includes a processor and a memory, where a machine-executable program is stored in the memory, and when the machine-executable program is executed by the processor, it is used to implement the control method described in any of the above schemes.

The inventors realized that if the humidity sensor used to acquire the humidity of the compartment in the freezer compartment freezes, the humidity of the compartment acquired by the humidity sensor is actually the humidity of the ice layer condensed on it. Therefore, the value of the acquired compartment humidity is always relatively high. Based on this understanding, the present invention judges whether the humidity sensor may be frozen by monitoring whether the compartment humidity in the freezer compartment acquired by the humidity sensor remains at the preset maximum humidity within the first preset time period during the cooling period of the freezer compartment and the evaporator temperature of the freezer evaporator is lower than the compartment temperature of the freezer compartment, and judges whether the humidity sensor is still at the preset maximum humidity by increasing the operating frequency of the compressor when the humidity sensor may be frozen. If it is still the preset maximum humidity, it is determined that the humidity sensor is frozen. This is because, during the cooling period of the freezer compartment and the temperature of the evaporator of the freezer evaporator is lower than the temperature of the compartment of the freezer compartment, the moisture in the freezer compartment will condense at the lower temperature of the freezer evaporator, and within a certain period of time, the humidity of the compartment in the freezer compartment should gradually decrease. If the humidity of the compartment in the freezing compartment obtained by the humidity sensor remains at the preset maximum humidity within the first preset time period, the humidity sensor may be frozen. In order to verify whether the humidity sensor is really frozen, the present invention further increases the operating frequency of the compressor. At this time, the temperature of the refrigerated evaporator becomes lower, and more moisture in the refrigerated compartment condenses on the refrigerated evaporator, so the humidity in the refrigerated compartment should drop even lower. If the compartment humidity in the freezing compartment acquired again by the humidity sensor is still the preset maximum humidity, it is determined that the humidity sensor is frozen. It can be seen that the control method of the present invention reasonably monitors and judges the humidity value of the compartment acquired by the humidity sensor during an appropriate period, can accurately draw the conclusion whether the humidity sensor is frozen, reduces or prevents the possibility of misjudgment, and can promptly thaw the humidity sensor after the humidity sensor is frozen, so as to facilitate subsequent humidity control.

Further, when the humidity sensor is defrosted, heat will inevitably be transferred to the freezing compartment. For this reason, after determining that the humidity sensor is frozen, the present invention first lowers the shutdown point temperature of the freezer compartment refrigeration process, that is, lowers the temperature of the freezer compartment in advance before shutting down, so that even if part of the heat generated when the humidity sensor is thawed after shutdown is transferred to the freezer compartment, the temperature of the freezer compartment can be balanced within a reasonable and appropriate range, and the temperature rise of the freezer compartment will not be too high and affect the preservation of food in it.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic structural diagram of a refrigerating and freezing device according to one embodiment of the present invention;

Fig. 2 is a schematic structural block diagram of a compression refrigeration system of a refrigerator-freezer according to an embodiment of the present invention;

Fig. 3 is a schematic flowchart of a control method of a refrigerating and freezing device according to a specific embodiment of the present invention;

Fig. 4 is a schematic flow chart of thawing a humidity sensor according to an embodiment of the present invention;

Fig. 5 is a schematic flowchart of a control method according to a specific embodiment of the present invention after the humidity sensor is defrosted;

Fig. 6 is a schematic structural block diagram of a refrigerating and freezing device according to an embodiment of the present invention.

Detailed ways

The present invention firstly provides a control method of a refrigerating and freezing device. FIG. 1 is a schematic structural diagram of a refrigerating and freezing device according to an embodiment of the present invention, and FIG. 2 is a schematic structural block diagram of a compression refrigeration system of a refrigerating and freezing device according to an embodiment of the present invention.

Referring to Fig. 1 and Fig. 2, the refrigerating and freezing device 1 of the present invention includes a box body 10 and a compression refrigeration system 20. A freezer compartment 11 is defined in the box body 10. A humidity sensor 31 for detecting the humidity of the compartment inside is provided in the freezer compartment 11. The compression refrigeration system 20 includes a compressor 21 for compressing refrigerant and a refrigeration evaporator 22 for providing cooling capacity for the freezer compartment 11. Further, the compression refrigeration system 20 also includes a refrigeration throttling device 23 and a condenser 29 connected in series with the compressor 21 . Specifically, the freezing throttling device 23 may be a capillary tube or a throttling valve or the like.

The control method of the refrigerating and freezing device of the present invention comprises:

When the refrigerating and freezing device 1 is in the cooling period of the freezing compartment, the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 are obtained;

When the evaporator temperature of the freezing evaporator 22 is lower than the compartment temperature in the freezing compartment 11, the humidity of the compartment in the freezing compartment 11 is acquired by the humidity sensor 31;

If the humidity in the freezer compartment 11 has been maintained at the preset maximum humidity for the first preset time period, then increase the operating frequency of the compressor 21 and obtain the humidity in the freezer compartment 11 again through the humidity sensor 31; it can be understood that after increasing the operating frequency of the compressor 21, the actual humidity in the freezer compartment 11 will not change significantly after a period of time. Therefore, the humidity in the freezer compartment 11 can be acquired through the humidity sensor 31 after increasing the operating frequency of the compressor 21 for a period of time;

If the compartment humidity in the frozen compartment 11 obtained again is still the preset maximum humidity, it is determined that the humidity sensor 31 is frozen; and

After the freezing compartment 11 is cooled, the humidity sensor 31 is thawed.

The inventor realized that if the humidity sensor 31 used to obtain the humidity of the freezer compartment 11 freezes, the humidity of the compartment obtained by the humidity sensor 31 is actually the humidity of the ice layer condensed on it. Therefore, the obtained value of the humidity of the compartment is always relatively high. On the basis of this understanding, the present invention judges whether the humidity sensor 31 may be frozen by monitoring whether the compartment humidity in the freezer compartment 11 obtained by the humidity sensor 31 remains at the preset maximum humidity during the cooling period of the freezer compartment and the evaporator temperature of the freezer evaporator 22 is lower than the compartment temperature of the freezer compartment 11, and whether the humidity sensor 31 is still at the preset maximum humidity by increasing the operating frequency of the compressor 21 when the humidity sensor 31 may be frozen. If it is still the preset maximum humidity, then it is determined that the humidity sensor 31 is frozen. This is because, during the cooling period of the freezing compartment and the evaporator temperature of the freezing evaporator 22 is lower than the compartment temperature of the freezing compartment 11, the moisture in the freezing compartment 11 will condense at the freezing evaporator 22 at a lower temperature, and within a certain period of time, the humidity of the compartment in the freezing compartment 11 should gradually decrease. If the humidity in the freezing compartment 11 acquired by the humidity sensor 31 remains at the preset maximum humidity within the first preset time period, the humidity sensor 31 may be frozen. In order to verify whether the humidity sensor 31 is really frozen, the present invention further increases the operating frequency of the compressor 21. At this time, the temperature of the refrigerating evaporator 31 becomes lower, and more moisture in the freezing compartment 11 condenses on the refrigerating evaporator 22. The humidity of the compartment in the freezing compartment 11 should drop even lower. If the compartment humidity in the freezing compartment 11 acquired again by the humidity sensor 31 is still the preset maximum humidity, it is determined that the humidity sensor 31 is frozen.

It can be seen that the control method of the present invention reasonably monitors and judges the humidity value of the compartment acquired by the humidity sensor 31 in a suitable period, can accurately draw a conclusion on whether the humidity sensor 31 is frozen, reduces or prevents the possibility of misjudgment, and can promptly thaw the humidity sensor 31 after the humidity sensor 31 is frozen, so as to facilitate subsequent humidity control.

Fig. 3 is a schematic flowchart of a control method of a refrigerating and freezing device according to a specific embodiment of the present invention. Referring to Fig. 3, in a specific embodiment, the control method of the present invention comprises:

Step S10, during the cooling period of the freezing compartment, obtain the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11;

Step S20, judge whether the evaporator temperature of the refrigerated evaporator 22 is lower than the compartment temperature in the refrigerated compartment 11, if so, then go to step S30; if not, return to continue the judgment;

Step S30, obtaining the compartment humidity in the freezer compartment 11 through the humidity sensor 31;

Step S40, judging whether the humidity of the compartment in the freezing compartment 11 has been kept at the preset maximum humidity within the first preset time period, if so, go to step S50;

Step S50, increasing the operating frequency of the compressor 21;

Step S60, after the seventh preset period of time, the humidity of the compartment in the freezing compartment 11 is obtained again through the humidity sensor 31;

Step S70, judging whether the compartment humidity in the freezer compartment 11 acquired again is still the preset maximum humidity, if so, go to step S80;

Step S80, determining that the humidity sensor 31 is frozen; and

In step S90, the humidity sensor 31 is defrosted after the cooling of the freezing compartment 11 is completed.

Specifically, the value of the first preset duration may be any duration value between 3 and 7 minutes. The preset maximum humidity may specifically be 100% or other higher relative humidity values.

In some embodiments, in the judging step of step S70, if the conclusion is no, the control method of the present invention further includes:

Step S140, judging whether the absolute value of the difference between the humidity of the compartment in the refrigerated compartment 11 obtained again and the preset maximum humidity is within the first preset range, if yes, go to step S150; if not, go to step S160;

Step S150, determining that the humidity sensor 31 is normal;

In step S160, it is determined that the humidity sensor 31 is faulty.

That is to say, if the absolute value of the difference between the humidity in the freezer compartment 11 and the preset maximum humidity obtained again after increasing the operating frequency of the compressor 21 is within the first preset range, which is consistent with the variation of the actual humidity in the freezer compartment 11, then the humidity sensor 31 is normal. If the absolute value of the difference between the compartment humidity in the freezing compartment 11 and the preset maximum humidity obtained again after increasing the operating frequency of the compressor 21 is outside the first preset range, which is contrary to the change of the actual humidity in the freezing compartment 11, then the humidity sensor 31 has failed.

In other embodiments, the control method of the present invention also includes:

judging whether the absolute value of the difference between the acquired humidity in the freezing compartment 11 and the preset maximum humidity is within the first preset range;

If so, it is determined that the humidity sensor 31 is normal;

If not, then further increase the operating frequency of the compressor 21, and obtain the humidity of the compartment in the freezer compartment 11 again through the humidity sensor 31, if the absolute value of the difference between the humidity of the compartment in the freezer compartment 11 acquired again and the humidity of the compartment in the freezer compartment 11 acquired last time is within the second preset range, then it is determined that the humidity sensor 31 is normal; otherwise, it is determined that the humidity sensor 31 is faulty. It can be understood that the second preset range is greater than the first preset range.

That is to say, if the absolute value of the difference between the humidity in the freezer compartment 11 and the preset maximum humidity obtained again after increasing the operating frequency of the compressor 21 is outside the first preset range, the humidity sensor 31 may be malfunctioning. In order to verify whether the humidity sensor 31 really fails, the present invention increases the operating frequency of the compressor 21 again, and obtains the compartment humidity in the freezer compartment 11 through the humidity sensor 31 again. If the absolute value of the difference between the newly acquired humidity in the freezing compartment 11 and the humidity in the freezing compartment 11 acquired last time is within the second preset range, it means that the last judgment was indeed a misjudgment, and the humidity sensor 31 should be normal; This embodiment avoids the possibility of misjudgment, and the conclusion is more accurate.

Similarly, after increasing the operating frequency of the compressor 21 each time, it is necessary to wait for a period of time before obtaining the compartment humidity in the freezing compartment 11 through the humidity sensor 31 .

In some embodiments, if the judgment result in step S40 is negative, that is, the humidity in the freezing compartment 11 is not always kept at the preset maximum humidity within the first preset time period, the control method of the present invention further includes:

Step S170, judging whether the humidity of the compartment in the freezing compartment 11 has decreased within the first preset time period; if yes, go to step S150; if not, go to step S160;

Step S150, determining that the humidity sensor 31 is normal;

In step S160, it is determined that the humidity sensor 31 is faulty.

That is to say, if the humidity in the freezer compartment 11 acquired within the first preset time period has a downward trend, which is consistent with the change trend of the actual humidity in the freezer compartment 11 , then the humidity sensor 31 is normal. Conversely, if the humidity in the freezer compartment 11 obtained within the first preset time period has an upward trend, which is opposite to the change trend of the actual humidity in the freezer compartment 11 , then the humidity sensor 31 has failed.

In some embodiments, after determining that the humidity sensor 31 is frozen, the control method of the present invention further includes:

Reduce the shutdown point temperature of the refrigerating and freezing device 1 during the cooling process of the freezing compartment.

The inventors realized that when the humidity sensor 31 is thawed, the heat used for thawing will inevitably be transferred to the freezing compartment 11 . Therefore, after determining that the humidity sensor 31 is frozen, the present invention lowers the temperature at the shutdown point of the freezer compartment cooling process, that is, lowers the temperature of the freezer compartment 11 in advance before shutting down, so that even if part of the heat generated when the humidity sensor 31 is thawed after shutdown is transferred to the freezer compartment 11, the temperature of the freezer compartment 11 can be balanced within a reasonable and appropriate range, and the temperature rise of the freezer compartment 11 will not be too high and affect the preservation of food in it.

In some embodiments, the step of thawing the humidity sensor 31 may specifically include:

Start the heating device, and release heat to the humidity sensor 31 through the heating device.

That is to say, the humidity sensor 31 can be thawed directly by starting the heating device.

Fig. 4 is a schematic flow chart of thawing a humidity sensor according to an embodiment of the present invention. In some other embodiments, the step of thawing the humidity sensor 31 may specifically include:

Step S91, judging whether the defrosting start condition for defrosting the refrigerated evaporator 22 is met; if yes, then go to step S92, if not, then go to step S93;

Step S92, start the heating device immediately, so as to release heat to the humidity sensor 31 through the heating device;

Step S93, judging whether the time from reaching the defrosting start condition is greater than the second preset duration; if yes, go to step S92, if not, go to step S94;

Step S94, waiting for the defrosting start condition to be met before starting the heating device.

Specifically, the second preset duration may be any duration value between 0.5 and 1.5 minutes.

The inventor realized that since the humidity sensor 31 is located in the freezer compartment 11 , if the heating device is directly activated, the heat generated by the heating device may have a greater impact on the temperature of the freezer compartment 11 . For this reason, the present invention starts the heating device immediately when the defrosting start condition for defrosting the refrigerating evaporator is met, starts the heating device after waiting for the defrosting start condition to be satisfied when the defrosting start condition is about to be met, and starts the heating device immediately when there is still a long period of time before meeting the defrosting start condition. The timeliness of thawing of the humidity sensor 31 is ensured so as to accurately control the humidity of the freezing compartment 11.

In some embodiments, defrosting start conditions include any one or more of the following:

The time interval from the last defrosting of the freezing evaporator 22 reaches the preset maximum frosting time;

The accumulative running time of the compressor 21 reaches the third preset time;

The accumulative door-opening time of the freezing door corresponding to the freezing compartment 11 reaches the fourth preset time.

In some other embodiments, the defrosting starting condition may also include other suitable conditions capable of starting defrosting the refrigerated evaporator 22 .

Fig. 5 is a schematic flowchart of a control method according to a specific embodiment of the present invention after the humidity sensor is defrosted. In some embodiments, after the humidity sensor 31 is defrosted, the control method of the present invention further includes:

Step S100, during the next cooling period of the freezing compartment, obtain the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11;

Step S110, judge whether the evaporator temperature of the refrigerated evaporator 22 is lower than the compartment temperature in the refrigerated compartment 11, if yes, go to step S120; if not, return to continue the judgment;

Step S120, acquiring the compartment humidity in the freezer compartment 11 through the humidity sensor 31;

Step S130, judging whether the humidity of the compartment in the freezer compartment 11 is still the preset maximum humidity, if yes, go to step S160; if not, go to step S150.

That is to say, after the humidity sensor 31 is thawed, if the compartment humidity obtained by the humidity sensor 31 is still the preset maximum humidity when cooling again, it means that the humidity sensor 31 has failed; if the compartment humidity obtained by the humidity sensor 31 is lower than the preset maximum humidity, it means that the humidity sensor 31 has returned to normal.

In some embodiments, after determining that the humidity sensor 31 is faulty, the control method of the present invention further includes:

An alarm signal for prompting the failure of the humidity sensor 31 is issued, so that the user can know the failure of the humidity sensor 31 in time, so as to replace or repair it in time.

After the failure of the humidity sensor, the humidity of the freezer compartment 11 cannot be accurately obtained through the humidity sensor 31, so the humidity control cannot be performed based on the measured humidity of the freezer compartment 11, and the humidity in the freezer compartment 11 needs to be controlled by other means.

For this reason, in some embodiments, a refrigerated compartment 12 is defined in the cabinet 10, and the compression refrigeration system 20 further includes a refrigerating throttling device 23, a refrigerating branch circuit connected in parallel with the refrigerating throttling device 23 for providing cooling capacity to the refrigerating compartment 12, and a switching valve 24 for selectively conducting the refrigerating throttling device 23 or the refrigerating branch circuit. Specifically, the refrigeration branch can include a refrigeration evaporator 25 and a refrigeration throttling device 26 connected in series, and the refrigeration throttling device 26 can be a capillary tube or a throttle valve or the like.

In these embodiments, after determining that the humidity sensor 31 is faulty, the control method of the present invention further includes:

When the refrigerating and freezing device 1 reaches the preset automatic shutdown condition, the switching valve 24 is controlled to switch to the state of conducting the refrigerating branch circuit, and the operating frequency of the compressor 21 is adjusted to the preset frequency, and the refrigerating fan used to drive air supply to the refrigerating compartment 12 is controlled to operate at 45% to 55% of its set duty cycle, and the refrigerating fan used to drive air supply to the refrigerated compartment 11 is controlled to operate at 45% to 55% of its set duty cycle;

The compressor 21, the refrigerating fan and the freezing fan are stopped after the fifth preset time period.

That is to say, the present invention delays shutdown when the refrigerating and freezing device 1 reaches the automatic shutdown condition, and continues cooling for the refrigerating compartment 12 by switching to the refrigerating branch circuit, sets the operating frequency of the compressor 21 to a lower preset frequency, and adjusts the refrigerating fan and the freezing fan to operate at 45% to 55% of their respective preset duty cycles. Therefore, the moisture in the freezer compartment 11 and the moisture produced by the frost sublimation on the freezer evaporator 22 will gather in the freezer compartment 11, thereby achieving the purpose of humidifying the freezer compartment 11.

In some embodiments, a temperature-variable compartment 13 is defined in the box body 10, and the compression refrigeration system 20 further includes a temperature-variable branch connected in parallel with the freezing throttling device 23 for providing cooling capacity to the variable-temperature compartment 13. Specifically, the temperature-variable branch may include a temperature-variable evaporator 27 and a variable-temperature throttling device 28 connected in series, and the variable-temperature throttling device 28 may specifically be a capillary tube or a throttle valve or the like.

After the refrigerating and freezing device 1 is switched to the cooling state of the refrigerating compartment for a sixth preset period of time, control the refrigerating fan to operate at 45% to 55% of its set duty cycle; and/or

After the refrigerating and freezing device 1 is switched to the cooling state of the variable temperature compartment, the refrigerating fan is controlled to operate at 65% to 75% of its set duty ratio.

The present invention controls the refrigerating fan to operate at 45% to 55% and 65% to 75% of the set duty cycle respectively during the cooling period of the refrigerating compartment and the cooling period of the variable temperature compartment, and can deliver a cooling air flow with a lower temperature to the freezing compartment 11, thereby suppressing the temperature rise of the freezing compartment 11 during the cooling period of the refrigerating compartment and the cooling period of the variable temperature compartment.

The present invention also provides a refrigerating and freezing device, and FIG. 6 is a schematic structural block diagram of the refrigerating and freezing device according to an embodiment of the present invention. Referring to Fig. 1, Fig. 2 and Fig. 6, the refrigerating-freezing device 1 of the present invention comprises a casing 10 and a compression refrigeration system 20. A freezing compartment 11 is defined in the casing 10. The compression refrigeration system 20 includes a compressor 21 for compressing refrigerant and a refrigeration evaporator 22 for providing cooling capacity for the freezing compartment 11.

In particular, the refrigerating and freezing device 1 further includes a humidity sensor 31 and a control device 40 . The humidity sensor 31 is used to obtain the compartment humidity in the freezing compartment 11 . The control device 40 includes a processor 41 and a memory 42, the memory 42 stores a machine executable program 43, and the machine executable program 43 is used to implement the control method described in any of the above embodiments when executed by the processor 41.

Specifically, both the compressor 21 and the humidity sensor 31 are connected to the control device 40 .

Specifically, the processor 41 may be a central processing unit (central processing unit, CPU for short), or a digital processing unit or the like. The processor 41 sends and receives data through the communication interface. The memory 44 is used to store programs executed by the processor 41 . The memory 44 is any medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, and can also be a combination of multiple memories. The above-mentioned machine-executable program 43 can be downloaded from a computer-readable storage medium to a corresponding computing/processing device or downloaded to a computer or an external storage device via a network (such as the Internet, a local area network, a wide area network, and/or a wireless network).

The refrigerating and freezing device 1 of the present invention reasonably monitors and judges the humidity value of the compartment acquired by the humidity sensor 31 during an appropriate period, can accurately draw a conclusion on whether the humidity sensor 31 is frozen, reduces or prevents the possibility of misjudgment, and can promptly thaw the humidity sensor 31 after the humidity sensor 31 is frozen, so as to facilitate subsequent humidity control.

Those skilled in the art should understand that the refrigerating and freezing device 1 of the present invention is not limited to the three-door refrigerator shown in FIG.

Those skilled in the art should also understand that the refrigerating and freezing device 1 of the present invention includes not only a refrigerator, but also a freezer, a freezer or other refrigerating and freezing devices with at least a freezing function.

So far, those skilled in the art should recognize that although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the disclosed content of the present invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

A control method for a refrigerating and freezing device, the refrigerating and freezing device includes a box body and a compression refrigeration system, the box is defined with a freezer compartment, the freezer compartment is provided with a humidity sensor for detecting the humidity of the compartment therein, and the compression refrigeration system includes a compressor for compressing refrigerant and a refrigerating evaporator for providing cooling capacity for the freezer compartment; the control method includes:

When the refrigerating and freezing device is in the cooling period of the freezing compartment, obtaining the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment;

When the evaporator temperature of the refrigerated evaporator is lower than the temperature of the compartment in the refrigerated compartment, the humidity of the compartment in the refrigerated compartment is acquired by the humidity sensor;

If the compartment humidity in the refrigerated compartment remains at the preset maximum humidity within the first preset period of time, increase the operating frequency of the compressor and obtain the compartment humidity in the refrigerated compartment again through the humidity sensor;

If the compartment humidity in the freezer compartment obtained again is still the preset maximum humidity, it is determined that the humidity sensor is frozen; and

Thawing treatment is performed on the humidity sensor after the cooling of the freezing compartment is completed.
The control method according to claim 1, wherein, after determining that the humidity sensor is frozen, the control method further comprises:

Reduce the shutdown point temperature of the refrigerating and freezing device in the refrigerating process of the freezing compartment.
The control method according to claim 1, wherein the step of thawing the humidity sensor comprises:

Start the heating device, and release heat to the humidity sensor through the heating device.
The control method according to any one of claims 1-3, wherein the step of thawing the humidity sensor comprises:

judging whether the defrosting start condition for defrosting the refrigerated evaporator is met;

If the defrosting start condition is reached, start the heating device immediately to release heat to the humidity sensor through the heating device;

If the defrosting start condition is not met, it is judged whether the time from reaching the defrosting start condition is greater than a second preset duration;

If so, then immediately start the heating device;

If not, wait until the defrosting start condition is met before starting the heating device.
The control method according to claim 4, wherein the defrosting start conditions include any one or more of the following:

The time interval from the last defrosting of the freezing evaporator reaches the preset maximum frosting time;

The accumulative running time of the compressor reaches a third preset time;

The accumulative door opening time of the freezing door body corresponding to the freezing compartment reaches a fourth preset time length.
The control method according to any one of claims 1-3, further comprising:

judging whether the re-acquired absolute value of the difference between the compartment humidity in the freezing compartment and the preset maximum humidity is within a first preset range;

If so, then determine that the humidity sensor is normal;

If not, it is determined that the humidity sensor is faulty.
The control method according to claim 1, further comprising:

judging whether the re-acquired absolute value of the difference between the compartment humidity in the freezing compartment and the preset maximum humidity is within a first preset range;

If so, then determine that the humidity sensor is normal;

If not, further increase the operating frequency of the compressor, and acquire the humidity of the compartment in the refrigerated compartment again through the humidity sensor. If the absolute value of the difference between the humidity of the compartment in the refrigerated compartment acquired again and the humidity of the compartment in the refrigerated compartment acquired last time is within a second preset range, it is determined that the humidity sensor is normal; otherwise, it is determined that the humidity sensor is faulty.
According to the control method according to claim 1, after the humidity sensor is defrosted, the control method further comprises:

During the next refrigerating period of the refrigerated compartment, obtaining the evaporator temperature of the refrigerated evaporator and the compartment temperature in the refrigerated compartment;

When the evaporator temperature of the refrigerated evaporator is lower than the temperature of the compartment in the refrigerated compartment, the humidity of the compartment in the refrigerated compartment is acquired by a humidity sensor;

If the compartment humidity in the freezer compartment is still the preset maximum humidity, it is determined that the humidity sensor is faulty;

If the compartment humidity in the freezer compartment is lower than the preset maximum humidity, it is determined that the humidity sensor is normal.
According to the control method according to claim 7 or 8, after determining that the humidity sensor is faulty, the control method further includes:

An alarm signal for prompting failure of the humidity sensor is issued.
A refrigerating and freezing device, comprising a cabinet and a compression refrigeration system, the cabinet is defined with a freezing compartment, the compression and refrigeration system includes a compressor for compressing refrigerant and a freezing evaporator for providing cooling capacity for the freezing compartment, and the refrigeration and freezing device also includes:

a humidity sensor for obtaining compartment humidity in the freezer compartment; and

The control device includes a processor and a memory, where a machine executable program is stored in the memory, and the machine executable program is used to implement the control method according to any one of claims 1-9 when executed by the processor.