CN106766577B - Frosting degree detection method and device for air-cooled refrigerator - Google Patents

Abstract

The invention provides a frosting degree detection method and device for an air-cooled refrigerator. Wherein the method for detecting the frosting degree of the air-cooled refrigerator includes: obtaining the cooling duration of the refrigeration system; judging whether the cooling duration is greater than or equal to the first preset duration, and if the result is yes, detecting the actual temperature in the refrigerating room; judging Whether the actual temperature is less than or equal to the preset temperature; and if not, it is determined that the frosting degree of the evaporator is serious. The scheme of the present invention determines the degree of frosting of the evaporator by detecting the cooling capacity of the refrigerated compartment, and can defrost the evaporator in time, which can avoid serious frosting of the evaporator under abnormal conditions, so that it cannot Thorough defrosting reduces the cooling capacity of the refrigerator and affects the storage effect of food in the refrigerator. In addition, the method of detecting the frosting degree of the evaporator is simple and fast, which saves the cost of the refrigerator.

Description

Method and device for detecting frosting degree of air-cooled refrigerator

technical field

The invention relates to the field of home appliance control, in particular to a method and device for detecting frosting degree of an air-cooled refrigerator.

Background technique

With the development of society and the improvement of people's living standards, and people's pace of life is getting faster and faster, people often buy a large number of items to be placed in refrigerators, and refrigerators have gradually become one of the requisite household appliances in people's lives. Science and technology are constantly developing, and so are refrigerators. From the previous old-fashioned refrigerators, it has gradually developed into direct-cooling refrigerators and the latest air-cooling refrigerators.

Air-cooled refrigerators are also called frost-free refrigerators, but air-cooled refrigerators do not produce frost, but let the frost basically condense on the evaporator, and will not condense on the inner wall of the refrigerator. The evaporator of the air-cooled refrigerator is arranged inside the refrigerator, which is separated from the inner wall of the refrigerator. Therefore, there will be no product frosting on the inner wall of the refrigerator, so it is called frost-free.

Because the surface temperature of the evaporator is very low, the humid air flowing through its surface will be cooled. When the temperature of the evaporator is lower than the air dew point temperature and lower than 0°C, the moisture in the air will be condensed and attached to the surface of the evaporator to form a frost layer. . There is an evaporator in the refrigerating compartment of the air-cooled dual-system refrigerator. Since the vegetables and fruits placed in the refrigerating compartment have high moisture content, the evaporator in the refrigerating compartment frosts quickly during the cooling process. Some data show that when the thickness of the frost layer on the surface of the evaporator reaches 10mm, the refrigeration capacity of the refrigerator will drop by at least 30%. Therefore, when the frost layer reaches a certain thickness, it must be defrosted in time.

The existing defrosting method is to realize defrosting by estimating the frosting amount of the evaporator and detecting the running time and door opening time of the refrigerator. When both the running time and door opening time of the refrigerator meet the conditions, it will enter the defrosting mode, and the heating wire will start to work. However, when the user puts in a large amount of food at one time, the evaporator in the refrigerator compartment will condense a large amount of frost in a short period of time. When the operating time and door opening time meet the conditions, the accumulated frost on the evaporator has formed after too long Ice, even if the heating wire is turned on, the frost cannot be completely defrosted, and the cumulative cooling capacity of the refrigerator will decrease, which will affect the storage effect of food in the refrigerator.

Contents of the invention

It is an object of the present invention to provide a simple method of detecting the degree of frosting in an evaporator.

A further object of the present invention is to improve the reliability of defrosting the evaporator and improve the refrigeration capacity of the refrigerator.

In particular, the present invention provides a method for detecting the frosting degree of an air-cooled refrigerator, wherein the air-cooled refrigerator includes a refrigerated compartment and a refrigeration system, wherein the refrigerated system includes a compressor, an evaporator and a fan to provide cooling to the refrigerated compartment. A temperature sensor is installed in the refrigerated room to detect the actual temperature in the refrigerated room, and the frosting degree detection method of the air-cooled refrigerator includes: obtaining the cooling time of the refrigeration system; judging whether the cooling time is greater than or equal to the first preset time, and if the result is yes, detect the actual temperature in the refrigerating room; determine whether the actual temperature is less than or equal to the preset temperature; and if not, determine that the degree of frosting on the evaporator is serious.

Optionally, the refrigerated compartment is provided with a return air outlet, so that the air in the refrigerated compartment is returned to the evaporator, and after the step of determining that the degree of frosting of the evaporator is serious also includes: controlling the evaporator to stop working, and keeping the fan The working state of the evaporator is used to air defrost the evaporator.

Optionally, after the step of defrosting the evaporator by air, it also includes: acquiring the duration of defrosting the evaporator by air; judging whether the duration of defrosting the evaporator is greater than or equal to the second preset duration; and if so, Make sure the air defrost is complete and record the number of air defrosts.

Optionally, after the step of recording the number of times of air defrosting, it further includes: judging whether the number of times of air defrosting is greater than or equal to the preset number; and if so, controlling the heater to turn on to heat and defrost the evaporator.

Optionally, when the number of air defrosting times is less than the preset number of times, the refrigeration system is driven to start cooling, and the cooling time of the refrigeration system and the actual temperature in the refrigerating room are obtained to detect the degree of frosting again.

According to another aspect of the present invention, there is also provided a frosting degree detection device for an air-cooled refrigerator, wherein the air-cooled refrigerator includes a refrigerating compartment and a refrigeration system, wherein the refrigerating system includes a compressor, an evaporator and a fan to provide The compartment provides cooling capacity, and a temperature sensor is installed in the refrigerating compartment to detect the actual temperature in the refrigerating compartment, and the frosting degree detection device of the air-cooled refrigerator includes: a first timing module configured to obtain the cooling time of the refrigeration system; The first judging module is configured to judge whether the cooling duration is greater than or equal to the first preset duration; the temperature detection module is configured to detect the actual temperature in the refrigerating room when the cooling duration is greater than or equal to the first preset duration; The second judging module is configured to judge whether the actual temperature is less than or equal to the preset temperature; and the degree determination module is configured to determine that the degree of frosting of the evaporator is severe when the actual temperature is greater than the preset temperature.

Optionally, the refrigerated compartment is provided with an air return port, so that the air in the refrigerated compartment is returned to the evaporator, and the frosting degree detection device of the air-cooled refrigerator further includes: a first defrosting module configured to control the evaporator Stop working and keep the fan running to air defrost the evaporator.

Optionally, the frosting degree detection device of the air-cooled refrigerator also includes: a second timing module configured to obtain the air defrosting time for air defrosting the evaporator; a third judging module configured to judge the air defrosting time Whether it is greater than or equal to the second preset duration; and the number recording module is configured to determine that the air defrost is completed and record the number of air defrost times when the air defrost duration reaches the second preset duration.

Optionally, the frosting degree detection device of the air-cooled refrigerator further includes: a fourth judging module configured to judge whether the number of times of air defrosting is greater than or equal to a preset number; and a second defrosting module configured to When the number of times is greater than or equal to the preset number of times, the heater is controlled to be turned on to heat and defrost the evaporator.

Optionally, the frosting degree detecting device of the air-cooled refrigerator further includes: a refrigeration drive module configured to drive the refrigeration system to start refrigeration when the number of defrosting times in the air is less than a preset number of times, and obtain the refrigeration duration and The actual temperature in the refrigerated room is used to detect the degree of frosting again.

The frosting degree detection method and device of the air-cooled refrigerator of the present invention detect the actual temperature in the refrigerating room when the cooling time is greater than or equal to the first preset time by obtaining the cooling time of the refrigeration system. After the first preset time period, the actual temperature in the refrigerated room should be lower than or equal to the preset temperature. If the actual temperature is greater than the preset temperature, it is determined that the cooling capacity of the refrigerated room has decreased, and then it can be determined that the frosting degree of the evaporator is serious. Timely detection of the frosting degree of the evaporator can avoid serious frosting of the evaporator under abnormal conditions, so that the frosting cannot be completely defrosted after the frost turns into ice, which reduces the cooling capacity of the refrigerator and affects the storage effect of food in the refrigerator. In addition, The method for detecting the frosting degree of the evaporator is simple and fast, and the cost of the refrigerator is saved.

Further, the frosting degree detection method and device of the air-cooled refrigerator of the present invention, after determining that the frosting degree of the evaporator is serious, control the evaporator to stop working, and keep the fan in the working state, so as to utilize the air from the refrigerated compartment Perform air defrosting on the evaporator. After the air defrosting is over, the refrigeration system is re-driven to refrigerate, and the degree of frosting of the evaporator is detected again. This cycle is repeated, and when the number of air defrosting reaches the preset number of times, the frosting of the evaporator is determined. The degree is extremely serious, and defrosting by air cannot be completely defrosted. At this time, the heater is controlled to turn on, and the evaporator is heated and defrosted. First, the air from the refrigerated compartment is used to defrost the evaporator by air to reduce the number of times the heater is turned on. , effectively saving energy consumption, combining air defrosting and heating defrosting can improve the reliability of evaporator defrosting, realize thorough defrosting, ensure that the evaporator can work normally, improve the refrigeration capacity of the refrigerator, and improve the user's use experience.

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

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 structural schematic diagram of an air-cooled refrigerator suitable for a frosting degree detection device of an air-cooled refrigerator according to an embodiment of the present invention;

Fig. 2 is a side sectional view of the air-cooled refrigerator shown in Fig. 1;

Fig. 3 is a schematic block diagram of a frosting degree detection device of an air-cooled refrigerator according to an embodiment of the present invention;

4 is a schematic block diagram of a frosting degree detection device of an air-cooled refrigerator according to another embodiment of the present invention;

5 is a schematic diagram of a method for detecting the degree of frosting of an air-cooled refrigerator according to an embodiment of the present invention; and

Fig. 6 is a detailed flowchart of a method for detecting frosting degree of an air-cooled refrigerator according to an embodiment of the present invention.

Detailed ways

This embodiment provides a frosting degree detection device for an air-cooled refrigerator, which can detect the frosting degree of the evaporator of the air-cooled refrigerator in time, so as to completely defrost the evaporator when the frosting degree is serious, and improve the wind speed. The cooling capacity of the refrigerator. Fig. 1 is a schematic structural diagram of an air-cooled refrigerator 100 suitable for an air supply control device of an air-cooled refrigerator according to an embodiment of the present invention, and Fig. 2 is a side sectional view of the air-cooled refrigerator 100 shown in Fig. 1 . The air-cooled refrigerator 100 may generally include: a box body 10 , a door body and a refrigeration system.

Wherein, the inside of the box body 10 defines a storage compartment and a compressor compartment. The number and structure of storage compartments can be configured according to requirements. Figure 1 shows the situation of the first and second compartments arranged up and down in sequence; the above storage compartments can be configured as refrigerated compartments, Freezer compartment, variable temperature compartment or fresh-keeping compartment. Each storage compartment can be divided into a plurality of storage areas by partition boards, and items can be stored using shelves or drawers. The air-cooled refrigerator 100 includes at least one refrigerated compartment, the first compartment of the air-cooled refrigerator 100 in this embodiment is a refrigerated compartment 11 , and the second compartment is a freezer compartment 12 .

The door is disposed on the front surface of the box body 10 for closing the storage compartment. The door body can be set corresponding to the storage compartment, that is, each storage compartment is corresponding to one or more door bodies. And the quantity of the storage compartment and the door body, the function of the storage compartment can be selected by the actual situation. The air-cooled refrigerator 100 of this embodiment corresponds to the refrigerated compartment 11 and the frozen compartment 12 arranged up and down in sequence, and is respectively provided with a first door body 21 and a second door body 22 . The door body can be pivotally arranged on the front surface of the box body 10, and can also be opened in a drawer type to realize a drawer-type storage compartment, wherein the drawer-type storage compartment is often provided with metal slide rails, which can ensure that the drawer is opened The closing process is gentle and reduces noise.

The refrigeration system may be a compression refrigeration cycle system including a compressor, an evaporator, and a fan to provide cooling capacity to the storage compartment. The refrigeration system may also include a condenser, a throttling device, etc., and the compressor is installed in the compressor compartment . The evaporator is configured to directly or indirectly provide cooling to the storage compartment. The air-cooled refrigerator 100 of the present embodiment can be a double refrigeration system refrigerator, that is, the refrigeration system includes two evaporators, which are respectively arranged in the refrigerating compartment 11 and the freezing compartment 12. During the refrigeration process, the evaporator and the evaporator of the refrigerating compartment 11 The evaporators of the freezer compartment 12 can be refrigerated alternately. Wherein can realize the switching of cooling between refrigerated compartment 11 and freezer compartment 12 by controlling the flow direction of refrigerant, refrigerant goes to the evaporator of refrigerated compartment 11, and refrigerated compartment 11 refrigerates; Evaporator, freezer compartment 12 refrigeration. In some other embodiments, the air-cooled refrigerator 100 may only include the refrigerated compartment 11 , and the refrigeration system only provides cold energy to the refrigerated compartment 11 .

The air-cooled refrigerator 100 may include an inner container, and a storage compartment is defined inside the inner container, and a refrigerator compartment 11 and a freezer compartment 12 are defined inside the inner container in this embodiment. An evaporator cavity and an air supply duct are formed on the outside of the back of the liner, wherein the evaporator 111 and the fan 112 of the refrigerated compartment 11 can be arranged in the evaporator cavity of the refrigerated compartment 11 . The air supply duct of the refrigerated compartment 11 is provided with an air outlet 113 . The air supply duct can be symmetrically designed, and there are at least two symmetrical air outlets in each storage area, which can make the air supply in each storage area more effective, and the temperature in the storage area is more uniform, which is more conducive to Items in the air-cooled refrigerator 100 are stored. The fan 112 may provide cooling generated by the evaporator 111 to the refrigerated compartment 11 .

As shown in FIG. 2 , dashed arrows show the direction of air circulation in the refrigerated compartment 11 . When the high-temperature air flow passes through the evaporator 111, it fully exchanges heat with the evaporator 111, and the temperature of the air will decrease. At the same time, the fan 112 forces the cold air to circulate, and the air flow is sent to the refrigerated compartment 11 through the air outlets 113 of the refrigerated compartment 11 along the air supply duct. The inner tank of the refrigerated compartment 11 is also provided with a return air outlet 114, so that the gas whose temperature rises in the refrigerated compartment 11 enters through the return air outlet 114 and returns to the evaporator 111 through the refrigerated return air duct. The air supply duct of the compartment 11 re-enters the refrigerated compartment 11, and the circulation is refrigerated like this. The air-cooled refrigerator 100 reduces the temperature of the air-cooled refrigerator 100 through this continuous cycle. Wherein the air-cooled refrigerator 100 may be provided with a temperature sensor in the refrigerated compartment 11 to detect the actual temperature in the refrigerated compartment 11 .

3 is a schematic block diagram of a frosting degree detection device 30 of an air-cooled refrigerator according to an embodiment of the present invention. Frost level is tested. As shown in Figure 3, the frosting degree detection device 30 of the air-cooled refrigerator of the present embodiment may include: a first timing module 311, a first judgment module 312, a temperature detection module 313, a second judgment module 314 and a degree determination module 315 .

Among the above modules, the first timing module 311 may be configured to obtain the cooling duration of the refrigeration system. The first judging module 312 may be configured to judge whether the cooling duration is greater than or equal to a first preset duration. The temperature detection module 313 may be configured to detect the actual temperature in the refrigerated compartment 11 when the cooling duration is greater than or equal to the first preset duration. The second judging module 314 can be configured to judge whether the actual temperature is less than or equal to the preset temperature. The degree determining module 315 may be configured to determine that the degree of frosting of the evaporator 111 is severe when the actual temperature is greater than the preset temperature.

Wherein, the first preset time length and the preset temperature can be matched and set. When the evaporator 111 is not frosted and is in a normal cooling state, when the cooling time of the refrigeration system is t1, the actual temperature in the refrigerating room 11 can reach T. Then the first preset time length can be set as t1, and the preset temperature can be set as T. In a preferred embodiment, the first preset duration may be the longest cooling time of the refrigerated compartment 11 , and the corresponding preset temperature may be the shutdown temperature of the refrigerated compartment 11 . After the cooling time reaches the first preset time length, if the actual temperature of the refrigerated compartment 11 is greater than the preset temperature, it indicates that the refrigerating capacity of the refrigerated compartment 11 has decreased, and then it can be determined that the evaporator 111 is seriously frosted, and the evaporator 111 can be detected in time. The degree of frosting at 111 can avoid serious frosting on the evaporator 111 under abnormal conditions, so that it cannot be completely defrosted after the frosting becomes ice, which reduces the cooling capacity of the refrigerator and affects the storage effect of food in the refrigerator. In addition, other compartments in the air-cooled refrigerator other than the refrigerating compartment 11, such as the freezing compartment 12, can also determine the frosting degree of the evaporator by detecting the cooling capacity of the evaporator.

Fig. 4 is a schematic block diagram of a frosting degree detection device 30 of an air-cooled refrigerator according to another embodiment of the present invention. On the basis of the previous embodiment, the frosting degree detection device 30 of the air-cooled refrigerator of the present embodiment can also be provided with: a first defrosting module 321, a second timing module 322, a third judging module 323, and a frequency recording module 324 , a fourth judging module 325 , a second defrosting module 326 , and a refrigeration driving module 327 .

Wherein, the first defrosting module 321 may be configured to control the evaporator 111 to stop working, and keep the fan 112 in the working state, so as to air defrost the evaporator 111 . The air-cooled refrigerator 100 of this embodiment may include a refrigerating compartment 11 and a freezing compartment 12, and during the cooling process, the evaporator of the refrigerating compartment 11 and the evaporator of the freezing compartment 12 may cool alternately. Wherein the refrigerating system provides different cold quantities to the refrigerating compartment 11 and the freezing compartment 12, so that the temperatures in the refrigerating compartment 11 and the freezing compartment 12 are also different. The temperature in the refrigerated compartment 11 is generally between 2°C and 10°C, preferably 3°C to 8°C. The temperature within freezer compartment 12 typically ranges from -22°C to -14°C. Because the temperature in the refrigerated compartment 11 is higher than 0°C, the gas returned to the evaporator 111 by the air return port 114 of the refrigerated compartment 11 is generally the air with a raised temperature in the refrigerated compartment 11, which can be used to cool the evaporator 111. Perform air defrosting. At the same time, the frosting cooling capacity of the evaporator 111 can also lower the temperature of the refrigerated compartment 11, which can ensure that the temperature in the refrigerated compartment 11 meets the storage requirements to a certain extent.

In the case that the air-cooled refrigerator 100 is a dual-refrigeration system refrigerator, during the air defrosting process of the evaporator 111 in the refrigerating compartment 11, the refrigerant can be transferred to the evaporator of the freezing compartment 12, and the compressor still works. , the freezing compartment 12 is in a cooling state. In some other embodiments, the air-cooled refrigerator 100 may only include the refrigerated compartment 11, and during the air defrosting process of the evaporator 111 in the refrigerated compartment 11, the compressor may stop working together with the evaporator 111 to avoid compression. The machine does extra work, which can save energy consumption.

The second timing module 322 may be configured to obtain the air defrosting duration for air defrosting the evaporator 111 . The third judging module 323 may be configured to judge whether the air defrosting duration is greater than or equal to the second preset duration. The times recording module 324 may be configured to determine the completion of the air defrosting and record the number of times of the air defrosting when the air defrosting duration reaches the second preset duration. The second preset duration can be set according to the actual situation, and the effect of defrosting the evaporator 111 by air is taken as a standard.

The fourth judging module 325 may be configured to judge whether the number of times of air defrosting is greater than or equal to a preset number of times. The second defrosting module 326 may be configured to control the heater to turn on to heat and defrost the evaporator 111 when the number of air defrosting times is greater than or equal to a preset number of times. The refrigeration drive module 327 can be configured to drive the refrigeration system to start refrigeration when the number of air defrosting times is less than the preset number of times, and obtain the cooling time of the refrigeration system and the actual temperature in the refrigerated compartment 11, so as to measure the degree of frosting again. detection.

It should be noted that if the first preset time length for cooling the refrigerated compartment 11 is t1, the second preset time length for air defrosting the evaporator 111 is t2, and the preset number of times for air defrosting is N, then ( The time of t1+t2)×N is shorter than the original defrosting period T of the air-cooled refrigerator 100 , wherein the defrosting period T is the time interval between two original defrosting processes of the air-cooled refrigerator 100 . The original defrosting process can be realized by detecting the cooling time and door opening time of the refrigerator. For example, if the cooling time and door opening time of the refrigerator meet the conditions, the defrosting is performed by the heater, but the cooling time and the door opening time meet the conditions. In some cases, that is, after the time of the defrosting cycle T, the accumulative time of frosting on the evaporator 111 is too long. Under abnormal circumstances, for example, when a large amount of vegetables and fruits are placed in the refrigerated compartment 11 at one time, although the refrigerating time and door opening time of the refrigerator do not meet the conditions, the evaporator 111 may still be seriously frosted and not timely Handling may turn into ice and not completely defrost. The time of (t1+t2)×N in this embodiment is shorter than the original defrosting cycle T of the air-cooled refrigerator 100, and can detect the degree of frosting of the evaporator 111 in time for abnormal situations and perform defrosting when the frosting is serious. Avoid affecting the cooling effect of the refrigerator.

The frosting degree detection device 30 of the air-cooled refrigerator of the present embodiment detects the actual temperature in the refrigerated compartment 11 by acquiring the cooling time of the refrigeration system, and when the cooling time is greater than or equal to the first preset time, the actual temperature in the refrigerating room 11 is detected. After the time reaches the first preset duration, the actual temperature in the refrigerated compartment 11 should be lower than or equal to the preset temperature. If the actual temperature is greater than the preset temperature, it is determined that the cooling capacity of the refrigerated compartment 11 has decreased, and then it can be determined that the evaporator 111 Timely detection of the frosting degree of the evaporator 111 can avoid severe frosting of the evaporator 111 under abnormal conditions, so that the frosting cannot be completely defrosted after the frosting becomes ice, reducing the cooling capacity of the refrigerator and affecting the food in the refrigerator In addition, the method for detecting the frosting degree of the evaporator 111 is simple and fast, which saves the cost of the refrigerator.

Further, the frosting degree detection device 30 of the air-cooled refrigerator of the present embodiment, after determining that the frosting degree of the evaporator 111 is serious, controls the evaporator 111 to stop working, and maintains the working state of the fan 112, so as to utilize the evaporator 111 from the refrigerated room. The air in the chamber 11 defrosts the evaporator 111 by air. After the air defrost is completed, the refrigeration system is re-driven to refrigerate, and the frosting degree of the evaporator 111 is detected again. It is determined that the degree of frosting on the evaporator 111 is extremely serious, and defrosting by air cannot be completely defrosted. At this time, the heater is controlled to turn on, and the evaporator 111 is heated and defrosted. Air defrosting can reduce the number of times the heater is turned on, effectively saving energy consumption. Combining air defrosting and heating defrosting can improve the reliability of defrosting the evaporator 111, achieve complete defrosting, and ensure that the evaporator 111 can work normally. Work, improve the cooling capacity of the refrigerator, and improve the user experience.

5 is a schematic diagram of a method for detecting the degree of frosting of an air-cooled refrigerator according to an embodiment of the present invention. The method for detecting the degree of frosting of an air-cooled refrigerator can use the device 30 for detecting the degree of frosting of an air-cooled refrigerator in any of the above-mentioned embodiments implement. As shown in the figure, the frosting degree detection method of the air-cooled refrigerator performs the following steps in sequence:

Step S502, obtaining the cooling time of the refrigeration system;

Step S504, judging whether the cooling duration is greater than or equal to the first preset duration, if yes, execute step S506, if not, return to execute step S502;

Step S506, detecting the actual temperature in the refrigerated compartment 11;

Step S508, judging whether the actual temperature is less than or equal to the preset temperature, if yes, return to step S502, if not, execute step S510;

In step S510, it is determined that the degree of frosting on the evaporator 111 is serious.

In the above steps, the cooling duration in step S502 can be obtained by a timer, and the actual temperature in step S506 can be detected by a temperature sensor installed in the refrigerated compartment 11 .

The first preset duration in step S504 and the preset temperature in step S508 can be set to match. When the evaporator 111 is not frosted and is in normal cooling state, when the cooling duration of the refrigeration system is t1, the temperature in the refrigerating room 11 If the actual temperature can reach T, then the first preset time length can be set as t1, and the preset temperature can be set as T. In a preferred embodiment, the first preset duration may be the longest cooling time of the refrigerated compartment 11 , and the corresponding preset temperature may be the shutdown temperature of the refrigerated compartment 11 . After the cooling time reaches the first preset time length, if the actual temperature of the refrigerated compartment 11 is greater than the preset temperature, it indicates that the refrigerating capacity of the refrigerated compartment 11 has decreased, and then it can be determined that the evaporator 111 is seriously frosted, and the evaporator 111 can be detected in time. The degree of frosting at 111 can avoid serious frosting on the evaporator 111 under abnormal conditions, so that it cannot be completely defrosted after the frosting becomes ice, which reduces the cooling capacity of the refrigerator and affects the storage effect of food in the refrigerator. In addition, other compartments in the air-cooled refrigerator 100 other than the refrigerating compartment 11 , such as the freezing compartment 12 , can also determine the degree of frosting of the evaporator 111 by detecting the cooling capacity of the evaporator.

Fig. 6 is a detailed flowchart of a method for detecting frosting degree of an air-cooled refrigerator according to an embodiment of the present invention. The frosting degree detection method of the air-cooled refrigerator performs the following steps in sequence:

Step S602, obtaining the cooling time of the refrigeration system;

Step S604, judging whether the cooling duration is greater than or equal to the first preset duration, if yes, execute step S606, if not, return to execute step S602;

Step S606, detecting the actual temperature in the refrigerated compartment 11;

Step S608, judging whether the actual temperature is less than or equal to the preset temperature, if yes, return to step S602, if not, execute step S610;

Step S610, determining that the frosting degree of the evaporator 111 is serious;

Step S612, controlling the evaporator 111 to stop working, and maintaining the working state of the fan 112, so as to air-defrost the evaporator 111;

Step S614, obtaining the air defrosting duration for air defrosting the evaporator 111;

Step S616, judging whether the air defrosting duration is greater than or equal to the second preset duration, if yes, execute step S618, if not, return to execute step S614;

Step S618, determine that the air defrosting is completed and record the number of air defrosting;

Step S620, judging whether the number of times of air defrosting is greater than or equal to the preset number, if yes, execute step S622, if not, execute step S624;

Step S622, controlling the heater to turn on, so as to heat and defrost the evaporator 111;

Step S624, drive the refrigeration system to start refrigeration and return to step S602.

In the above steps, the air defrosting of the evaporator 111 in step S612 may utilize the gas returned to the evaporator 111 from the air return port 114 of the refrigerated compartment 11 . The air-cooled refrigerator 100 of this embodiment may include a refrigerating compartment 11 and a freezing compartment 12, and during the cooling process, the evaporator of the refrigerating compartment 11 and the evaporator of the freezing compartment 12 may cool alternately. Wherein the refrigerating system provides different cold quantities to the refrigerating compartment 11 and the freezing compartment 12, so that the temperatures in the refrigerating compartment 11 and the freezing compartment 12 are also different. The temperature in the refrigerated compartment 11 is generally between 2°C and 10°C, preferably 3°C to 8°C. The temperature within freezer compartment 12 typically ranges from -22°C to -14°C. Because the temperature in the refrigerated compartment 11 is higher than 0°C, the gas returned to the evaporator 111 by the air return port 114 of the refrigerated compartment 11 is generally the air with a raised temperature in the refrigerated compartment 11, which can be used to cool the evaporator 111. Perform air defrosting.

In the case that the air-cooled refrigerator 100 is a dual-refrigeration system refrigerator, in the process of defrosting the evaporator 111 in the refrigerating compartment 11, the refrigerant can be transferred to the evaporator of the freezing compartment 12, and evaporated in step S612. When the compressor 111 stops working, the compressor can still work, and the freezing compartment 12 is in a cooling state. In some other embodiments, the air-cooled refrigerator 100 may only include the refrigerated compartment 11, and during the defrosting process of the evaporator 111 in the refrigerated compartment 11, the evaporator 111 stops working in step S612 and the compressor may Stop working together to avoid additional work of the compressor, which can save energy consumption.

It should be noted that if the first preset time length for cooling the refrigerated compartment 11 is t1, the second preset time length for air defrosting the evaporator 111 is t2, and the preset number of times for air defrosting is N, then ( The time of t1+t2)×N is shorter than the original defrosting period T of the air-cooled refrigerator 100 , wherein the defrosting period T is the time interval between two original defrosting processes of the air-cooled refrigerator 100 . The original defrosting process can be realized by detecting the cooling time and door opening time of the refrigerator. For example, if the cooling time and door opening time of the refrigerator meet the conditions, the defrosting is performed by the heater, but the cooling time and the door opening time meet the conditions. In some cases, that is, after the time of the defrosting cycle T, the accumulative time of frosting on the evaporator 111 is too long. Under abnormal circumstances, for example, when a large amount of vegetables and fruits are placed in the refrigerated compartment 11 at one time, although the refrigerating time and door opening time of the refrigerator do not meet the conditions, the evaporator 111 may still be seriously frosted and not timely Handling may turn into ice and not completely defrost. The time of (t1+t2)×N in this embodiment is shorter than the original defrosting cycle T of the air-cooled refrigerator 100, and can detect the degree of frosting of the evaporator 111 in time for abnormal situations and perform defrosting when the frosting is serious. Avoid affecting the cooling effect of the refrigerator.

The frosting degree detection method of the air-cooled refrigerator of the present embodiment, by obtaining the cooling duration of the refrigeration system, when the cooling duration is greater than or equal to the first preset duration, the actual temperature in the refrigerating room 11 is detected, and the cooling time After reaching the first preset time length, the actual temperature in the refrigerated compartment 11 should be lower than or equal to the preset temperature. If the actual temperature is greater than the preset temperature, it is determined that the cooling capacity of the refrigerated compartment 11 has decreased, and then the evaporator 111 can be determined. If the degree of frosting is serious, the degree of frosting on the evaporator 111 can be detected in time to avoid serious frosting on the evaporator 111 under abnormal conditions, so that the frosting cannot be completely defrosted after it turns into ice, which reduces the cooling capacity of the refrigerator and affects the quality of food in the refrigerator. In addition, the method for detecting the frosting degree of the evaporator 111 is simple and fast, which saves the cost of the refrigerator.

Further, the frosting degree detection method of the air-cooled refrigerator in this embodiment, after determining that the frosting degree of the evaporator 111 is serious, controls the evaporator 111 to stop working, and keeps the working state of the fan 112 to utilize the frosting degree from the refrigerated compartment. 11 air defrosts the evaporator 111 by air. After the air defrost is completed, the refrigeration system is re-driven to refrigerate, and the frosting degree of the evaporator 111 is detected again. The degree of frosting on the evaporator 111 is extremely serious, and defrosting by air cannot be completely defrosted. At this time, the heater is controlled to turn on, and the evaporator 111 is heated to defrost. Defrosting can reduce the number of openings of the heater and effectively save energy consumption. The combination of air defrosting and heating defrosting can improve the reliability of defrosting the evaporator 111, achieve complete defrosting, and ensure that the evaporator 111 can work normally , improve the cooling capacity of the refrigerator, and improve the user experience.

So far, those skilled in the art should appreciate 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, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (6)

1. A method of detecting the level of frost formation in an air-cooled refrigerator comprising a refrigeration compartment and a refrigeration system, wherein the refrigeration system comprises a compressor, an evaporator and a fan to provide refrigeration to the refrigeration compartment, a temperature sensor is provided in the refrigeration compartment to detect the actual temperature in the refrigeration compartment, and the method comprises:

Acquiring the refrigerating time of the refrigerating system;

Judging whether the refrigerating time is longer than or equal to a first preset time, and detecting the actual temperature in the refrigerating chamber under the condition that the refrigerating time is longer than or equal to the first preset time;

Judging whether the actual temperature is less than or equal to a preset temperature or not; and

If not, determining that the frosting degree of the evaporator is serious,

Wherein the refrigerating compartment is provided with an air return opening to return air of the refrigerating compartment to the evaporator, and further comprising, after the step of determining that the degree of frosting of the evaporator is serious: controlling the evaporator to stop working and keeping the working state of the fan so as to defrost the evaporator by air,

the step of defrosting the evaporator by air further comprises the following steps: acquiring the air defrosting time for defrosting the evaporator; judging whether the air defrosting time is greater than or equal to a second preset time; and if so, determining that air defrosting is finished and recording the air defrosting times.

2. the method of claim 1, further comprising, after the step of recording the number of air frostings:

judging whether the air defrosting times are more than or equal to preset times or not; and

If yes, the heater is controlled to be started so as to heat and defrost the evaporator.

3. The method of claim 2, wherein,

And under the condition that the air defrosting times are less than the preset times, driving the refrigerating system to start refrigerating, and acquiring the refrigerating time of the refrigerating system and the actual temperature in the refrigerating chamber to detect the frosting degree again.

4. A frosting degree detection apparatus of an air-cooled refrigerator, wherein the air-cooled refrigerator includes a refrigerating compartment and a refrigeration system, wherein the refrigeration system includes a compressor, an evaporator and a fan to provide refrigeration to the refrigerating compartment, a temperature sensor is provided in the refrigerating compartment to detect an actual temperature in the refrigerating compartment, and the apparatus comprises:

the first timing module is configured to acquire the refrigerating time of the refrigerating system;

the first judgment module is configured to judge whether the refrigerating time is greater than or equal to a first preset time;

A temperature detection module configured to detect an actual temperature within the refrigerated compartment when the refrigeration duration is greater than or equal to the first preset duration;

A second judgment module configured to judge whether the actual temperature is less than or equal to a preset temperature; and

A degree determination module configured to determine that a degree of frosting of the evaporator is serious in a case where the actual temperature is greater than the preset temperature,

Wherein the refrigerating compartment is provided with an air return opening to return air of the refrigerating compartment to the evaporator, and the apparatus further comprises: a first defrosting module configured to control the evaporator to stop working and maintain the working state of the fan so as to defrost the evaporator by air,

the second timing module is configured to acquire an air defrosting time for defrosting the evaporator;

The third judging module is configured to judge whether the air defrosting time is greater than or equal to a second preset time; and

and the frequency recording module is configured to determine that air defrosting is finished and record the frequency of air defrosting under the condition that the air defrosting time reaches the second preset time.

5. the apparatus of claim 4, further comprising:

the fourth judgment module is configured to judge whether the air defrosting times are larger than or equal to preset times; and

and the second defrosting module is configured to control the heater to be started to heat and defrost the evaporator under the condition that the air defrosting frequency is greater than or equal to the preset frequency.

6. the apparatus of claim 5, further comprising:

And the refrigeration driving module is configured to drive the refrigeration system to start refrigeration under the condition that the air defrosting time is less than the preset time, and obtain the refrigeration time of the refrigeration system and the actual temperature in the refrigerating chamber so as to detect the frosting degree again.