CN110873504A

CN110873504A - Defrosting control method of refrigerator and refrigerator

Info

Publication number: CN110873504A
Application number: CN201811011923.1A
Authority: CN
Inventors: 李伟; 聂圣源; 戚斐斐
Original assignee: Shenyang Fridge Co Ltd Of Haier
Current assignee: Shenyang Haier Refrigerator Co ltd; Haier Smart Home Co Ltd
Priority date: 2018-08-31
Filing date: 2018-08-31
Publication date: 2020-03-10
Anticipated expiration: 2038-08-31
Also published as: CN110873504B

Abstract

The invention provides a defrosting control method of a refrigerator and the refrigerator. The defrosting control method of the refrigerator comprises the following steps: recording the continuous running time of the refrigerator during each starting and refrigerating and the temperature difference between the evaporator inlet and the evaporator outlet at each refrigerating and stopping time; judging whether the growth rates of the continuous operation time of continuous multiple times of starting and refrigerating are all in a preset range and whether the temperature difference at the moment of refrigerating and stopping is increased in sequence; and if the judgment result is yes, starting the evaporator for defrosting. The defrosting control method of the invention ensures that the defrosting procedure is not influenced by the ambient temperature, the defrosting starting time is more accurate, and the defrosting according to the requirement is really realized.

Description

Defrosting control method of refrigerator and refrigerator

Technical Field

The invention relates to a refrigerating and freezing device, in particular to a defrosting control method of a refrigerator and the refrigerator.

Background

After the refrigerator runs for a period of time, because the return air of the compartment contains water vapor, the water vapor is condensed when passing through the surface of the evaporator to form a frost layer. After the frost layer reaches a certain thickness, the heat exchange effect of the evaporator can be seriously influenced, and the power consumption of the refrigerator is increased. Therefore, the refrigerator needs to be defrosted in time.

The existing defrosting procedure basically follows the control logic: the accumulated operation of the compressor reaches the preset time, the accumulated operation of the starting up reaches the preset time, the accumulated time of opening the door reaches the preset time, and defrosting is started when one of the three conditions is met. Although the defrosting procedure is not timed defrosting, the starting condition is relatively fixed and inaccurate. For example, when the refrigerator satisfies the above-described defrosting condition, the frost layer of the evaporator may be already thick. It is also possible that when the defrosting condition is met, the frost layer on the evaporator is still thin and does not need to be defrosted. In addition, when determining parameters of the defrosting program, a large amount of experimental verification and debugging are often needed, and the process is very complicated.

Disclosure of Invention

The invention aims to provide a defrosting control method of a refrigerator, which ensures that a defrosting procedure is not influenced by the ambient temperature, the defrosting starting time is more accurate, and defrosting according to needs is really realized.

Another object of the present invention is to provide a refrigerator capable of implementing the above defrosting control method.

In one aspect, the present invention provides a defrosting control method for a refrigerator, including:

recording the continuous running time of the refrigerator during each starting and refrigerating and the temperature difference between the evaporator inlet and the evaporator outlet at each refrigerating and stopping time;

judging whether the growth rates of the continuous operation time of continuous multiple times of starting and refrigerating are all in a preset range and whether the temperature difference at the moment of refrigerating and stopping is increased in sequence;

and if the judgment result is yes, starting the evaporator for defrosting.

Optionally, before recording the continuous operation time of the refrigerator for cooling after each power-on, the method further comprises:

acquiring a triggering event of initial electrification and refrigeration of a refrigerator;

judging whether the continuous running time of the initial power-on refrigeration of the refrigerator exceeds a first preset time or not;

if so, continuing the refrigeration operation of the refrigerator for a second preset time, and determining whether defrosting is started or not according to the temperature reduction range of the interior of the refrigerator and whether a shutdown event exists or not during the operation period of the refrigerator in the second preset time;

if not, after the refrigerator continues to operate for a third preset time, defrosting is started.

Optionally, the step of confirming whether to start defrosting according to a decrease range of the indoor temperature and whether there is a shutdown event during the operation of the refrigerator for the second preset time includes:

if the refrigerator is operated in the second preset time period, the temperature drop of the interior of the refrigerator is smaller than the first temperature difference threshold value and no shutdown event exists, after the refrigerator is operated for the second preset time period, defrosting is started;

and if the temperature of the interior of the refrigerator is reduced to be greater than or equal to the first temperature difference threshold value or a shutdown event occurs during the operation of the refrigerator in the second preset time, after the refrigerator is operated for the second preset time, the refrigerator is operated for the fourth preset time, and then defrosting is started.

Optionally, after the defrosting of the first power-on is completed, the refrigerator further comprises:

acquiring the continuous running time of first starting refrigeration after the refrigerator is defrosted;

judging whether the continuous running time of the first starting refrigeration after defrosting exceeds a fifth preset time or not;

if so, continuing the refrigeration operation of the refrigerator for a sixth preset time, and determining whether defrosting is started or not according to the temperature drop amplitude of the interior of the refrigerator and whether a shutdown event exists or not during the operation period of the refrigerator at the sixth preset time;

if not, the step of judging whether the increasing rates of the continuous running time of the continuous multi-time starting and refrigerating are all higher than a preset numerical value and whether the temperature difference at the moment of refrigerating and stopping is increased in sequence is still executed, and if yes, the step of starting the evaporator for defrosting is executed.

Optionally, the step of continuing the cooling operation of the refrigerator for a sixth preset time, and determining whether to start defrosting according to the operation period of the refrigerator in the sixth preset time, the drop amplitude of the indoor temperature and whether there is a shutdown event during the operation period, includes:

if the temperature drop of the refrigerator is smaller than the second temperature difference threshold value and no shutdown event exists during the operation of the refrigerator in the sixth preset time, starting defrosting after the refrigerator is operated for the sixth preset time;

and if the temperature of the refrigerator is reduced to be larger than or equal to the second temperature difference threshold value or a shutdown event occurs during the operation of the refrigerator in the sixth preset time, after the refrigerator is operated for the sixth preset time, the refrigerator is continuously operated for the seventh preset time, and then defrosting is started.

Optionally, judging whether the increasing rates of the continuous operation time of the continuous multiple times of starting and refrigerating are all in a preset range and whether the temperature difference at the moment of refrigerating and stopping is increased in sequence; if the judgment result is yes, the step of starting defrosting the evaporator comprises the following steps:

acquiring continuous running times of the refrigerator for three continuous times of starting and refrigerating, and recording the continuous running times as a first running time M1, a second running time M2 and a third running time M3 respectively;

acquiring the temperature difference between the evaporator inlet and the evaporator outlet at the refrigeration shutdown moment for three times, and recording the temperature difference as a first temperature difference delta T1, a second temperature difference delta T2 and a third temperature difference delta T3 respectively;

determining whether Δ T1< Δ T2< Δ T3, M3 ═ X × M2, and M2 ═ X × M1 are simultaneously established, where X is a preset coefficient and has a value range of: x is more than or equal to 1.2 and less than or equal to 1.3;

and if so, starting defrosting the evaporator.

Optionally, the recording the continuous operation time of the one-time startup refrigeration further includes:

when the starting refrigeration is judged to be the first starting after the refrigerator is newly loaded, the continuous running time N1 of the starting refrigeration is recorded;

judging whether N1 exceeds an eighth preset time T8;

if so, enabling the refrigerator to continuously carry out refrigeration operation for a ninth preset time, and determining whether defrosting is started or not according to the indoor temperature falling range and whether a shutdown event exists or not during the operation period of the refrigerator in the ninth preset time;

if not, the refrigerator is enabled to continuously operate, the starting and refrigerating continuous operation time N0 before new loading is recorded, the second, third and fourth starting continuous operation times N2, N3 and N4 after new loading are recorded, and when N0 is more than N2 and less than or equal to 0.6X T8, N2 and more than N3 and more than N4 and N4 and less than or equal to 1.3X N0 are simultaneously established, whether the increase rates of the continuous operation times of continuous multiple times of starting and refrigerating are all higher than a preset numerical value and the temperature difference at the refrigerating stop time is sequentially increased is still judged, and if the judgment results are yes, the evaporator is started to defrost; and judging that N0 is more than N2 and less than or equal to 0.6T 8, N2 is more than N3 and more than N4 and more than 1.3N 0 are simultaneously established or N0 is less than N2 and N2 is more than 0.6T 8, and starting defrosting after the refrigerator continues to perform the refrigerating operation for the tenth preset time.

Optionally, the step of continuing the cooling operation of the refrigerator for a ninth preset time, and determining whether to start defrosting according to the operation period of the refrigerator at the ninth preset time, the drop amplitude of the indoor temperature and whether there is a shutdown event during the operation period, includes:

if the temperature drop of the refrigerator is smaller than the third temperature difference threshold value and no shutdown event exists during the operation of the refrigerator in the ninth preset time, starting defrosting after the refrigerator runs for the ninth preset time;

and if the temperature of the refrigerator is reduced to be larger than or equal to the third temperature difference threshold value or a shutdown event occurs during the operation of the refrigerator in the ninth preset time, after the refrigerator is operated for the ninth preset time, the refrigerator is continuously operated for the eleventh preset time, and then defrosting is started.

Optionally, the step of determining that the starting refrigeration is the first starting operation after the refrigerator is newly loaded includes:

judging whether the continuous operation time of the starting refrigeration exceeds the preset multiple of the continuous operation time of the previous starting refrigeration;

if yes, the starting refrigeration is judged to be the first starting after the refrigerator is newly loaded.

In another aspect, the present invention also provides a refrigerator, including:

the vapor compression refrigeration cycle system provides cold energy to the interior of the compartment of the refrigerator by utilizing the evaporator;

the defrosting device is used for defrosting the evaporator; and

a controller comprising a memory and a processor, the memory having a computer program stored therein, and the computer program, when executed by the processor, for implementing a defrost control method according to any one of the above.

The defrosting control method is designed based on the following factors: the water vapor carried in compartment return air (after heat exchange between cold air and food is finished, the temperature rises, and then the cold air flows back to the evaporator, namely return air) is condensed when passing through the surface of the evaporator to form a frost layer, and the frost layer can influence the heat exchange effect of the evaporator. The thicker the frost layer is, the poorer the heat exchange effect of the evaporator is, and the longer the evaporator needs to run to reach the set temperature every time the evaporator is started for refrigeration. In other words, before defrosting, the frost layer becomes thicker and thicker, and the continuous operation time of starting the machine is gradually increased. In addition, the heat exchange effect of the evaporator is deteriorated, and the temperature difference between the inlet and the outlet of the evaporator is increased as a result. Therefore, the defrosting starting condition is comprehensively set according to the increase rate of the continuous operation time of starting and refrigerating for many times and the temperature difference between the inlet and the outlet of the evaporator, so that the defrosting control is more accurate, and defrosting on demand is realized.

Furthermore, when the refrigerator is powered on and cooled for the first time, the evaporator has no frost layer, and the compartment and the load are in relatively high temperature states, so that the refrigerator needs to run for a long time to cool the refrigerator. The defrosting control method takes the above factors into consideration, and carries out detailed design on the defrosting program during the initial power-on period, so that the whole defrosting control program is more complete and accurate. After the defrosting process of the refrigerator after the refrigerator is powered on for the first time is finished, the evaporator has no frost layer, and the time for starting and refrigerating for the first time after defrosting is influenced. The defrosting control method takes the factors into consideration, and carries out detailed design on a defrosting control program in the period so as to enable the defrosting control program to be more complete and accurate.

Further, the subsequent duration of the cooling operation will be affected after the refrigerator is newly loaded. The defrosting control method takes the factors into consideration, and carries out detailed design on the defrosting control program newly loaded on the refrigerator, so that the defrosting control program is more complete and accurate.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1 is a flowchart of a defrosting control method of a refrigerator according to one embodiment of the present invention;

fig. 2 is a flow of defrosting control during a first power-on period of a refrigerator in a defrosting control method of the refrigerator according to an embodiment of the present invention;

fig. 3 is a flow of defrosting control during a normal operation of the refrigerator in a defrosting control method of the refrigerator according to an embodiment of the present invention;

fig. 4 is a flow of defrosting control after a new load is applied during a normal operation of the refrigerator in the defrosting control method of the refrigerator according to an embodiment of the present invention;

fig. 5 is a schematic view of a refrigerator according to one embodiment of the present invention.

Detailed Description

The invention firstly provides a defrosting control method of a refrigerator. The refrigerator provided by the embodiment of the invention adopts a vapor compression refrigeration cycle system for refrigeration, and the vapor compression refrigeration cycle system comprises a compressor, a condenser, a throttling device, an evaporator and other parts. After the refrigerator is operated for a certain time, because the air returning from the compartment to the evaporator carries water vapor, the water vapor can be condensed when passing through the surface of the evaporator to form a frost layer. After the frost layer reaches a certain thickness, the heat exchange effect of the evaporator can be seriously influenced, and the power consumption of the refrigerator is increased. The defrosting device is used for controlling the defrosting device added on the evaporator to be started at proper time so as to heat and melt the frost layer of the evaporator.

Fig. 1 is a flowchart of a defrosting control method of a refrigerator according to one embodiment of the present invention. As shown in fig. 1, the defrosting control method of the refrigerator of the present embodiment may include the steps of:

step S102: and recording the continuous running time of the refrigerator for starting and refrigerating each time and the temperature difference between the evaporator inlet and the evaporator outlet at the moment of refrigerating and stopping each time.

Step S104: and judging whether the growth rates of the continuous operation time of the continuous multi-time starting and refrigerating are all in the preset range or not and whether the temperature difference at the moment of refrigerating and stopping is increased in sequence or not.

Step S106: and if the judgment result is yes, starting the evaporator for defrosting.

In the normal use process of the refrigerator, the compressor is not always in the starting state, but is intermittently started. Specifically, when the compartment interior temperature reaches the set temperature, the compressor will be shut down. And when the temperature of the room is higher than the preset temperature difference, starting the compressor for refrigeration. The duration of each time the refrigerator is started and cooled in step S102 refers to the operation time of the compressor in each cooling operation, and may also be referred to as a cooling cycle. The temperature difference between the evaporator inlet and the evaporator outlet is the difference between the coil temperature at the evaporator inlet minus the coil temperature at the evaporator outlet when the compressor is off. In step S104, the increase rate of the continuous operation time refers to (present continuous operation time — last continuous operation time)/last continuous operation time.

In some embodiments, the continuous operation time of refrigeration at each start-up and the temperature difference between the inlet and the outlet of the evaporator at each stop-up time need to be monitored during the use of the refrigerator. In step S104, the continuous operation time of the three consecutive times of the start-up cooling and the temperature difference at the stop time may be calculated to determine whether to start defrosting. The method specifically comprises the following steps:

the continuous operation times of the refrigerator for three consecutive times of power-on and cooling are obtained and recorded as a first operation time M1, a second operation time M2 and a third operation time M3 respectively. Acquiring the temperature difference between the evaporator inlet and the evaporator outlet at the moment of three times of refrigeration shutdown, and recording the temperature difference as a first temperature difference delta T1, a second temperature difference delta T2 and a third temperature difference delta T3 respectively; determining whether Δ T1< Δ T2< Δ T3, M3 ═ X × M2, and M2 ═ X × M1 are simultaneously established, where X is a preset coefficient and has a value range of: x is more than or equal to 1.2 and less than or equal to 1.3. Namely, whether the increasing rates of the continuous operation time of the three-time continuous starting and cooling are all between 20% and 30% is judged. When Δ T1< Δ T2< Δ T3, M3 ═ X × M2, and M2 ═ X × M1 are simultaneously established, that is, the defrosting start condition is satisfied, and the defrosting can be started after the third operation time M3 is completed. It is to be understood that if the determination condition of step S102 is not established, defrosting is not started for the moment.

Fig. 2 is a flow of defrosting control during a first power-on period of a refrigerator in a defrosting control method of the refrigerator according to an embodiment of the present invention.

After the refrigerator is newly purchased, the refrigerator is used by being plugged in for the first time, or the refrigerator is powered on for the first time after being placed for a long time, namely primary power-on refrigeration. After refrigeration for one or more periods after initial power-on, the refrigerator will defrost, which is called initial defrosting. The period before the frost is first dissolved is called a first power-on period; and after the primary defrosting is finished, the refrigerator enters a conventional operation period. In the initial power-on period of the refrigerator, the refrigerator is cooled as required, so that the refrigeration load is larger. And during normal operation, the refrigeration load tends to be stable. Therefore, in some embodiments, the above steps S102, S104 and S106 are performed only when the refrigerator is in a normal operation. And when the refrigerator is in the initial power-on period, the defrosting control can be carried out by adopting the steps shown in fig. 2. That is, the defrosting control flow (before step S102) during the first power-on period of the refrigerator may include the following steps:

step S201: and acquiring a triggering event of the initial power-on and refrigeration of the refrigerator.

Step S202: judging whether the continuous running time of the initial power-on refrigeration of the refrigerator exceeds a first preset time or not; if not, executing step S204; if yes, go to step S206. In the step, the first preset time is recorded as T1, the value range of T1 can be 4h or more and T1 or less and 6h or less, and specific numerical values are set according to different refrigerator models.

Step S204: and continuing to operate the refrigerator for a third preset time. In this step, the third preset time is T3. The lower the refrigeration set temperature is, the larger the refrigeration load of the refrigerator is, and the faster the evaporator frosting speed is. Therefore, the size of T3 is positively correlated with the set temperature of the refrigerator compartment. When the refrigeration set temperature is lower, T3 takes a relatively lower value; when the refrigeration set temperature is higher, T3 takes a relatively higher value. After the execution of this step is completed, step S205 is executed.

Step S205: and starting the refrigerator to defrost. The defrosting is the first defrosting after the refrigerator is powered on and is called as first-time power-on defrosting.

Step S209: and finishing the defrosting after the first time of power-on. The refrigerator reaches the defrosting end condition (for example, the surface temperature of the evaporator is higher than the preset temperature), and after the step is finished, the refrigerator enters a normal operation period.

Step S206: in step S202, if it is determined that the duration time of the initial power-on cooling exceeds the first preset time, the present step is executed. The method specifically comprises the following steps: and continuing to operate the refrigerator for a second preset time. In this step, the second preset time is T2. T2 may be set to a value of 0.25h ≦ T2 ≦ 0.75h, for example, T2 may be set to 0.5 h. After this step, in the operation process of the refrigerator in the second preset time, whether defrosting is started or not is confirmed by detecting the temperature drop amplitude of the interior of the refrigerator compartment and whether a shutdown event occurs, that is, step S207 is executed.

Step S207: and judging whether the temperature of the interior of the refrigerator is reduced to be less than the first temperature difference threshold value and no shutdown event is established or not during the operation period of the refrigerator in the second preset time. If yes, step S205 is executed, that is, after the refrigerator runs for the second preset time, defrosting is started. If not, namely the temperature in the compartment is decreased to be greater than or equal to the first temperature difference or a shutdown event occurs, executing step S208; in this step, the first temperature difference is Ts1, Ts1 is in the range of 1 ℃ to Ts1 to 3 ℃, for example, Ts1 may be set at 2 ℃.

Step S208: and (4) operating the refrigerator for a fourth preset time, and after the operation is finished, executing the step (S205) to start defrosting of the refrigerator. In this step, the fourth preset time is T4. The value range of T4 can be more than or equal to 2h and less than or equal to 5h and T4 and less than or equal to 5h, and specific numerical values are set according to different refrigerator models.

Fig. 3 is a flow of defrosting control during a normal operation of the refrigerator in a defrosting control method of the refrigerator according to an embodiment of the present invention.

After the refrigerator finishes the first electrification and defrosting, the evaporator has no frost layer, and the first starting refrigeration time after defrosting is influenced. One embodiment of the invention is designed in a detailed manner aiming at a defrosting control program after the refrigerator is electrified and defrosted for the first time. As shown in particular in figure 3.

In this embodiment, the defrosting control method of the refrigerator sequentially performs the following steps:

step S209: the first power-on defrosting of the refrigerator is finished (same as step S209 in fig. 2).

Step S301: and acquiring the continuous running time of the first starting refrigeration of the refrigerator after the initial defrosting, and judging whether the continuous running time exceeds a fifth preset time. If so, executing step S305 and subsequent steps S307, S308 and S304, if not, still executing the step of determining whether the increase rates of the continuous operation time of the continuous multiple times of starting and cooling are all higher than a preset value and whether the temperature difference at the time of cooling shutdown is sequentially increased, and if both the determination results are yes, specifically refining the step of starting defrosting the evaporator to steps S302, S203 and S304 (substantially the same as steps S102 to S106). In this step, the fifth preset time is T5. The value range of T5 can be more than or equal to 1h and less than or equal to T5 and less than or equal to 2h, and specific values are set according to different refrigerator models. Step S302: the step is executed when the first startup continuous operation time after the refrigerator is powered on for defrosting for the first time does not exceed T5. The method specifically comprises the following steps: the continuous operation times of the refrigerator for three consecutive times of power-on and cooling are obtained and recorded as a first operation time M1, a second operation time M2 and a third operation time M3 respectively. And acquiring the temperature difference between the evaporator inlet and the evaporator outlet at the moment of three times of refrigeration shutdown, and recording the temperature difference as a first temperature difference delta T1, a second temperature difference delta T2 and a third temperature difference delta T3 respectively. After this step is performed, step S303 is performed.

Step S303: determining whether Δ T1< Δ T2< Δ T3, M3 ═ X × M2, and M2 ═ X × M1 are simultaneously established, where X is a preset coefficient and has a value range of: x is more than or equal to 1.2 and less than or equal to 1.3. If yes, go to step S304; if not, the frost is not dissolved temporarily.

Step S304: and (5) starting defrosting.

Step S305: in step S301, when it is determined that the first-time startup duration time after the refrigerator is powered on for defrosting for the first time exceeds T5, the present step is performed. The method specifically comprises the following steps: and continuing the refrigerating operation of the refrigerator for a sixth preset time. Then, whether defrosting is initiated or not is confirmed according to the operation period of the refrigerator at the sixth preset time during which the temperature of the interior of the chamber is decreased and whether there is a shutdown event or not. That is, after step S305 is executed, step S307 is executed. In this step, the sixth preset time is T6, and the value range of T6 may be 0.5h ≦ T6 ≦ 1.5h, for example, T6 may be 1 h.

Step S307: it is determined whether the temperature drop is less than the second temperature difference threshold and the no-shutdown event is simultaneously true during operation of the refrigerator at T6. Note that the second temperature difference is Ts2, and the value range of Ts2 is: ts2 may be set to 2 ℃ at 1 ℃ to Ts1 ℃ to 3 ℃. If yes, go to step S304 to start defrosting. If not, that is, the compartment temperature drops to Ts2 or there is a shutdown event, step S308 is executed.

Step S308: and continuing to operate the refrigerator for a seventh preset time. In this step, the seventh preset time is T7. The value range of T7 can be more than or equal to 2h and less than or equal to 4h and T7 and less than or equal to 4h, and specific numerical values are set according to different refrigerator models. After step S308, step S304 is executed to start defrosting.

When the refrigerator is in normal operation, a new load situation may occur. The new load includes the situation that articles are newly put into the refrigerator or the door body is opened for a long time to enable indoor hot air to enter the compartment and the like. The operation time of the refrigerator after the new load is applied, and the operation time of the refrigerator after several times of starting, will be affected. One embodiment of the invention carries out detailed design on a defrosting control program after defrosting of a refrigerator and after new loading.

Fig. 4 is a flow of defrosting control after a new load is applied during a normal operation of the refrigerator in the defrosting control method of the refrigerator according to an embodiment of the present invention. As shown in fig. 4, the defrosting control method after the new load is added sequentially executes the following steps:

step S401: and confirming that the one-time starting refrigeration is the first starting after the refrigerator is newly loaded. Specifically, the following steps are adopted to judge whether the starting is the first starting operation after the refrigerator is newly loaded or not: and judging whether the continuous operation time of the starting refrigeration exceeds the preset multiple of the continuous operation time of the previous starting refrigeration. Assuming that the predetermined multiple is Y, Y may be 1.3. If yes, the starting refrigeration is judged to be the first starting after the refrigerator is newly loaded.

Step S402: the duration of time N1 for the first time power on cooling after the new load is applied is recorded.

Step S404: it is determined whether N1 exceeds the eighth preset time T8. If N1 > T8, go to step S405; if N1 is less than or equal to T8, step S409 and step S411 are executed.

Step S405: and the refrigerator continuously performs cooling operation for a ninth preset time. In this step, the ninth preset time is T9, and the value range of T9 may be 0.25h ≦ T9 ≦ 0.75h, for example, T9 may be 0.5 h. So as to confirm whether or not to initiate defrosting according to the falling amplitude of the indoor temperature and whether or not there is a shutdown event during the operation of the refrigerator at the ninth preset time, see steps S406, S408 and S407.

Step S406: it is determined whether the temperature drop is less than the third temperature difference threshold and no shutdown event is true during the operation of the refrigerator at T9. If yes, executing step S407, and starting defrosting; if not, go to step S408.

Step S407: and (5) starting defrosting.

Step S408: if it is judged in step S406 that the temperature drop is greater than or equal to the third temperature difference threshold or there is a shutdown event during the operation of the refrigerator at T9, the present step is performed. The method specifically comprises the following steps: and after the refrigerator runs for the ninth preset time, continuing to run for the eleventh preset time. In this step, the eleventh preset time is T11. The value range of T11 can be more than or equal to 2h and less than or equal to 4h and T11 and less than or equal to 4h, and specific numerical values are set according to different refrigerator models. After the step is executed, step S407 is executed to start defrosting.

Step S409: in step S404, if it is determined that N1 is not greater than T8, the present step is executed. The method specifically comprises the following steps: and (3) continuing to operate the refrigerator, recording the starting and refrigerating continuous operation time N0 before new loading, and recording the second starting continuous operation time N2, the third starting continuous operation time N3 and the fourth starting continuous operation time N4 after new loading. And judging whether N0 < N2 is not more than 0.6 × T8, N2 > N3 > N4 > 1.3 × N0 are simultaneously established or N0 < N2 and N2 > 0.6 × T8 are simultaneously established.

Step S410: in S409, if it is determined that N0 < N2 is not more than 0.6 × T8, N2 > N3 > N4 > 1.3 × N0 are simultaneously established, or N0 < N2 and N2 > 0.6 × T8 are established, the present step is executed. The method specifically comprises the following steps: and continuing the refrigerating operation of the refrigerator for a tenth preset time. In this step, the tenth preset time is T10. The value range of T10 can be more than or equal to 1h and less than or equal to T10 and less than or equal to 2h, and specific values are set according to different refrigerator models. After the step is executed, step S407 is executed to start defrosting.

Step S411: in step S404, if it is determined that N1 is not greater than T8, the present step is executed. The method specifically comprises the following steps: and (3) continuing to operate the refrigerator, recording the starting and refrigerating continuous operation time N0 before new loading, recording the continuous operation time N2 of the second starting after new loading, the continuous operation time N3 of the third starting and the continuous operation time N4 of the fourth starting, and judging whether N0 is more than N2 and less than or equal to 0.6 x T8, N2 is more than N3 and more than N4, and N4 is less than or equal to 1.3 x N0.

Step S412: if it is determined in step S411 that N0 < N2 is equal to or less than 0.6 × T8, N2 > N3 > N4, and N4 is equal to or less than 1.3 × N0, the present step is performed. The method specifically comprises the following steps: after N4, recording the continuous running time of each start-up refrigeration and the temperature difference between the evaporator inlet and the evaporator outlet at the moment of each refrigeration stop of the refrigerator;

step S413: and judging whether the growth rates of the continuous operation time of continuous multiple times of starting and refrigerating are all higher than a preset numerical value and whether the temperature difference at the moment of refrigerating and stopping is increased in sequence, and if so, starting the evaporator to defrost. If yes, go to step S407 to start defrosting.

Steps S412-S413 are substantially the same as steps S102-S104, and reference is made to the above.

The embodiment of the invention also provides the refrigerator. Fig. 5 is a schematic view of a refrigerator according to one embodiment of the present invention.

The refrigerator 10 of the present embodiment includes a vapor compression refrigeration cycle system 100, a defrosting apparatus 200, and a controller 300. The vapor compression refrigeration cycle system 100 includes an evaporator 110, and a condenser, a compressor, a throttle device, and the like, and supplies cooling energy to the interior of the compartment of the refrigerator using the evaporator 110.

The defrosting device 200 is used to defrost the evaporator 110. The defrosting device 200 may be embodied as an electric heating part that can controllably heat the evaporator 110.

The controller 300 includes a processor 310 and a memory 320. The memory 320 stores a computer program 321. And, the computer program 321 is executed to cause the controller 300 to execute the defrosting control method of the refrigerator in any one of the above embodiments.

The memory 320 of the present embodiment may be an electronic memory such as a flash memory, an EEPROM, an EPROM, a hard disk or a ROM, the memory 320 having storage space for a computer program 321 for performing any of the method steps of the above-described method. By running the computer program 321, the controller 300 performs the respective steps in the above-described method, implementing the defrosting control of the refrigerator.

The defrosting control method is designed based on the following factors: the water vapor carried in the compartment return air can be condensed when the water vapor passes through the surface of the evaporator to form a frost layer, and the frost layer can influence the heat exchange effect of the evaporator. The thicker the frost layer is, the poorer the heat exchange effect of the evaporator is, and the longer the evaporator needs to run to reach the set temperature every time the evaporator is started for refrigeration. In other words, before defrosting, the frost layer becomes thicker and thicker, and the continuous operation time of starting the machine is gradually increased. In addition, the heat exchange effect of the evaporator is deteriorated, and the temperature difference between the inlet and the outlet of the evaporator is increased as a result. Therefore, the defrosting starting condition is comprehensively set according to the increase rate of the continuous operation time of starting and refrigerating for many times and the temperature difference between the inlet and the outlet of the evaporator, so that the defrosting control is more accurate, and defrosting on demand is realized.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A defrosting control method of a refrigerator includes:

and if the judgment result is yes, starting the evaporator for defrosting.

2. The defrosting control method according to claim 1, further comprising, before recording the continuous operation time of the refrigerator for cooling at each power-on operation:

if not, the refrigerator is enabled to continue to operate for a third preset time, and then defrosting is started.

3. The defrosting control method of claim 2, wherein the step of confirming whether to activate defrosting according to a drop amplitude of the indoor temperature and whether there is a shutdown event during the operation of the refrigerator for the second preset time comprises:

if the refrigerator is operated in the second preset time period, the temperature drop of the interior of the refrigerator is smaller than the first temperature difference threshold value and no shutdown event exists, and then the refrigerator is operated for the second preset time period, and defrosting is started;

and if the temperature of the interior of the refrigerator is reduced to be greater than or equal to the first temperature difference threshold value or a shutdown event occurs during the operation of the refrigerator in the second preset time, after the refrigerator is operated for the second preset time, the refrigerator is operated for a fourth preset time, and then defrosting is started.

4. The defrosting control method of claim 2, further comprising, after the defrosting of the refrigerator after the first power-on is completed:

if so, continuing the refrigeration operation of the refrigerator for a sixth preset time, and determining whether defrosting is started or not according to the descending amplitude of the indoor temperature and whether a shutdown event exists during the operation period of the refrigerator in the sixth preset time;

and if not, still executing the step of judging whether the increase rates of the continuous operation time of the continuous multi-time starting and refrigerating are all higher than a preset numerical value and whether the temperature difference at the moment of refrigerating shutdown is increased in sequence, and if yes, starting the evaporator for defrosting.

5. The defrosting control method of claim 4, wherein the step of confirming whether to activate defrosting according to a drop amplitude of the indoor temperature and whether there is a shut-down event during the operation of the refrigerator for the sixth preset time comprises:

if the temperature drop of the refrigerator is smaller than a second temperature difference threshold value and no shutdown event exists during the operation of the refrigerator in the sixth preset time, starting defrosting after the refrigerator is operated for the sixth preset time;

and if the temperature of the refrigerator is reduced to be larger than or equal to the second temperature difference threshold value or a shutdown event occurs during the operation of the refrigerator in the sixth preset time, after the refrigerator is operated for the sixth preset time, the refrigerator is operated for the seventh preset time again, and then defrosting is started.

6. The defrosting control method according to claim 1, wherein it is determined whether the increase rates of the continuous operating time of the continuous multiple startup cooling are all within a preset range and the temperature difference at the time of the cooling shutdown is sequentially increased; if the judgment result is yes, the step of starting defrosting the evaporator comprises the following steps:

and if so, starting defrosting the evaporator.

7. The defrosting control method according to claim 1, wherein the recording the continuous operation time of the start-up cooling once further comprises:

judging whether N1 exceeds an eighth preset time T8;

if so, enabling the refrigerator to continuously carry out refrigerating operation for a ninth preset time, and determining whether defrosting is started or not according to the descending amplitude of the indoor temperature and whether a shutdown event exists or not during the operation period of the refrigerator in the ninth preset time;

if not, the refrigerator is enabled to continuously operate, the starting and refrigerating continuous operation time N0 before new loading is recorded, the second, third and fourth starting continuous operation times N2, N3 and N4 after new loading are recorded, and when the conditions that N0 is larger than N2 and is equal to or less than 0.6X T8, N2 is larger than N3 and is larger than N4 and N4 is equal to or less than 1.3X N0 are simultaneously met, the steps of judging whether the increasing rates of the continuous operation times of continuous multiple times of starting and refrigerating are all higher than a preset numerical value and whether the temperature difference at the refrigerating stop time is sequentially increased are still executed, and if yes, the step of starting and defrosting the evaporator; and judging that N0 is more than N2 and less than or equal to 0.6T 8, N2 is more than N3 and more than N4 and more than 1.3N 0 are simultaneously established or N0 is less than N2 and N2 is more than 0.6T 8, and starting defrosting after the refrigerator continues to perform the refrigerating operation for the tenth preset time.

8. The defrosting control method of claim 7, wherein the step of continuing the cooling operation of the refrigerator for a ninth preset time, and confirming whether to start defrosting according to a drop amplitude of the indoor temperature and whether there is a shut-down event during the operation of the refrigerator for the ninth preset time, comprises:

if the temperature drop of the refrigerator is smaller than a third temperature difference threshold value and no shutdown event exists during the operation of the refrigerator in the ninth preset time, starting defrosting after the refrigerator is operated for the ninth preset time;

and if the temperature of the refrigerator is reduced to be larger than or equal to the third temperature difference threshold value or a shutdown event occurs during the operation of the refrigerator in the ninth preset time, after the refrigerator is operated for the ninth preset time, the refrigerator is operated for the eleventh preset time again, and then defrosting is started again.

9. The defrosting control method according to claim 7, wherein the step of judging the start-up cooling as the first start-up operation after the refrigerator is newly loaded comprises:

10. A refrigerator, comprising:

the defrosting device is used for defrosting the evaporator; and

a controller comprising a memory and a processor, the memory having stored therein a computer program, and the computer program, when executed by the processor, for implementing the defrost control method of any one of claims 1-9.