CN113970215B

CN113970215B - Refrigerator defrosting method and refrigerator

Info

Publication number: CN113970215B
Application number: CN202010709726.8A
Authority: CN
Inventors: 彭洪祥
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2023-03-28
Anticipated expiration: 2040-07-22
Also published as: CN113970215A

Abstract

The invention provides a defrosting method of a refrigerator, wherein the refrigerator comprises a compressor, a condenser, an electromagnetic valve, a freezing capillary tube and a freezing evaporator which are sequentially connected in series to form a loop, two ends of the freezing capillary tube are connected with a refrigerating branch in parallel, and the refrigerating branch comprises a refrigerating capillary tube and a refrigerating evaporator which are connected in series; the defrosting method comprises the following steps: one of the freezing evaporator and the refrigerating evaporator is firstly subjected to defrosting independently and then is subjected to preferential refrigeration on the corresponding chamber, and then the other evaporator is subjected to defrosting independently and is sequentially subjected to preferential refrigeration on the corresponding chamber; in the invention, defrosting of the freezing chamber and the refrigerating chamber is carried out at different time, and after defrosting of the freezing chamber or defrosting of the refrigerating chamber is finished, the corresponding chamber is preferentially refrigerated so as to rapidly cool the corresponding chamber; thereby reducing the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting.

Description

Refrigerator defrosting method and refrigerator

Technical Field

The invention belongs to the technical field of household refrigerators, and particularly relates to a refrigerator defrosting method and a refrigerator.

Background

At present, a multi-system refrigerator is provided with a refrigeration system consisting of a plurality of evaporators and a plurality of groups of throttling capillary tubes, and the capillary tubes are switched through electromagnetic valves or electric valves to refrigerate different evaporators respectively. A plurality of evaporators of a multi-system frost-free refrigerator need defrosting, a refrigerating evaporator generally adopts blowing defrosting or blowing defrosting and auxiliary heating defrosting, and a freezing evaporator generally adopts electric heating defrosting.

According to the GB/T8059 standard, during a storage temperature test, the temperature rise of a freezing chamber is required to be not more than 3K, for example, the temperature of the freezing chamber in stable operation is-19 ℃, and the highest temperature of the freezing chamber in a defrosting and recovery period is not more than-16 ℃;

the defrosting period of the freezing chamber is 96h at the longest and 12h at the shortest according to the GB/T8059 standard; the refrigerating chamber has more water, and simultaneously has lower defrosting power or only adopts blowing for defrosting, so that the defrosting period is generally shorter in order to avoid defrosting completely; the cold storage chamber adopts blowing defrosting, the defrosting time is generally about 80-100min, and the defrosting time is generally shorter by adopting hot defrosting for freezing, about 30min;

the defrosting periods of the refrigerating chamber and the freezing chamber are different, the defrosting time is also different, and the defrosting periods are mutually influenced: because the evaporators of the system adopting series-parallel connection are mutually associated and not completely independent, the interaction needs to be considered: when the downstream evaporator in the flowing direction of the refrigerant defrosts, the upstream evaporator can not normally refrigerate, and when the upstream evaporator in the flowing direction of the refrigerant defrosts, the downstream evaporator can normally refrigerate. At present, a freezing chamber and a refrigerating chamber are adopted to synchronously defrost, and the method specifically comprises the following steps: after the defrosting condition of the freezing evaporator is achieved, firstly refrigerating and precooling to stop, then freezing and precooling to stop or lower, then entering freezing and refrigerating synchronous defrosting, starting the press with a delay of 5-10min after the defrosting of the freezing evaporator is finished, refrigerating for 30min independently, and then entering a freezing and refrigerating temperature control program (refrigerating for priority); in the defrosting process, on one hand, due to the defrosting time and the forced refrigerating time requirement of refrigeration after defrosting, the refrigerating temperature rise is large because the refrigeration cannot be carried out; on the other hand, the temperature rise of the freezing chamber is large in the defrosting process, after the defrosting of the freezing evaporator is finished and the forced freezing refrigeration is finished, the freezing chamber cannot continue to refrigerate due to the fact that the temperature of the refrigerating chamber is high and the refrigerating chamber has high refrigeration priority, and the freezing refrigeration can be carried out only after the refrigerating refrigeration is finished, so that the temperature rise of the freezing chamber is large; that is, the temperature of the freezing chamber and the refrigerating chamber is high after the defrosting is carried out simultaneously, and the refrigeration is needed, and the temperature of the other chamber is increased no matter refrigeration or freezing refrigeration is given priority.

The invention is provided in view of the above.

Disclosure of Invention

The invention provides a refrigerator defrosting method aiming at the technical problems.

In order to achieve the purpose, the invention adopts the technical scheme that:

the defrosting method of the refrigerator comprises a compressor, a condenser, an electromagnetic valve, a freezing capillary tube and a freezing evaporator which are sequentially connected in series to form a loop, wherein two ends of the freezing capillary tube are connected with a refrigerating branch in parallel, and the refrigerating branch comprises a refrigerating capillary tube and a refrigerating evaporator which are connected in series; the defrosting method comprises the following steps:

one of the freezing evaporator and the refrigerating evaporator is firstly subjected to defrosting independently and then is subjected to preferential refrigeration for the corresponding chamber, and then the other evaporator is subjected to defrosting independently and is sequentially subjected to preferential refrigeration for the corresponding chamber.

Preferably, the refrigerator defrosting method comprises the following steps: pre-cooling in a refrigerating chamber and pre-cooling in a freezing chamber; and after the pre-cooling of the refrigerating chamber is finished, the refrigerating chamber is pre-cooled, after the pre-cooling of the refrigerating chamber is finished, the freezing evaporator is independently defrosted, then the refrigerating preferential refrigeration is carried out, and then the refrigerating evaporator is independently defrosted and the refrigerating preferential refrigeration is successively carried out.

Preferably, the refrigerator defrosting method comprises the following steps: pre-cooling in a refrigerating chamber and pre-cooling in a freezing chamber; after the pre-cooling of the refrigerating chamber is finished, the refrigerating evaporator is independently defrosted and then refrigerating priority refrigeration is carried out, after the refrigerating priority refrigeration is finished, the refrigerating chamber is pre-cooled firstly, then the refrigerating evaporator is independently defrosted and freezing priority refrigeration is carried out successively.

Preferably, the refrigerating compartment precooling comprises:

the electromagnetic valve is switched to the cold storage side, and the compressor works;

monitoring the freezing Pre-Cooling temperature T _C1 And the refrigerated precooling temperature T is set _C1 With a preset refrigeration precooling temperature threshold value T _C0 Comparing;

when T is _C1 ≤T _C0 And when the pre-cooling of the cold storage chamber is finished.

Preferably, the freezing compartment pre-cooling comprises:

the electromagnetic valve is switched to the freezing side, and the compressor works;

monitoring the freezing Pre-Cooling temperature T _D1 And the freezing precooling temperature T is set _D1 With a preset freezing precooling temperature threshold value T _D0 Comparing;

when T is _D1 ≤T _D0 And (3) when precooling of the freezing chamber is finished, independently defrosting the freezing evaporator.

Preferably, the defrosting of the freezing evaporator comprises closing an electromagnetic valve, and working a freezing heating wire until the defrosting of the freezing evaporator is finished; and the defrosting of the refrigeration evaporator comprises the closing of an electromagnetic valve, and the working of a refrigeration heating wire and/or a refrigeration fan is completed when the defrosting of the refrigeration evaporator is finished.

Preferably, the freezing priority refrigeration comprises the following steps:

the electromagnetic valve is switched to the freezing side, the compressor works, and the freezing fan works;

monitoring priority freeze duration t _d1 And the preferential freezing time period t _d1 And a preset priority freezing time threshold value t _d0 Carrying out comparison;

when t is _d1 ≥t _d0 When the cooling is completed, the freezing priority cooling is completed.

Preferably, the freezing priority refrigeration is specifically as follows: and operating the original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

Preferably, the refrigeration priority cooling includes:

the electromagnetic valve is switched to the refrigerating side, the compressor works, and the refrigerating fan works;

monitoring a priority refrigeration time period t _c1 And the priority refrigeration time length t is set _c1 And a preset priority refrigeration time threshold value t _c0 Comparing;

when t is _c1 ≥t _c0 And when the refrigeration is finished, the refrigeration priority refrigeration is finished.

A refrigerator is used for realizing the refrigerator defrosting method.

Compared with the prior art, the invention has the advantages and positive effects that:

the invention provides a defrosting method of a refrigerator, wherein the refrigerator comprises a compressor, a condenser, an electromagnetic valve, a freezing capillary tube and a freezing evaporator which are sequentially connected in series to form a loop, two ends of the freezing capillary tube are connected with a refrigerating branch in parallel, and the refrigerating branch comprises a refrigerating capillary tube and a refrigerating evaporator which are connected in series; the defrosting method comprises the following steps: one of the freezing evaporator and the refrigerating evaporator is firstly subjected to defrosting independently and then is subjected to preferential refrigeration on the corresponding chamber, and then the other evaporator is subjected to defrosting independently and is sequentially subjected to preferential refrigeration on the corresponding chamber; in the invention, defrosting of the freezing chamber and the refrigerating chamber is carried out at different times, and after defrosting of the freezing chamber or defrosting of the refrigerating chamber is finished, the corresponding chamber is preferentially refrigerated so as to rapidly cool the corresponding chamber; thereby reducing the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting.

Drawings

FIG. 1 is a schematic structural view of a refrigerator system according to the present invention;

FIG. 2 is a schematic block diagram of a defrosting system for a refrigerator according to the present invention;

FIG. 3 is a flowchart illustrating an overall control process of a first embodiment of a defrosting method for a refrigerator according to the present invention;

FIG. 4 is a specific control flow chart of a first embodiment of a defrosting method for a refrigerator according to the present invention;

FIG. 5 is a flowchart illustrating overall control of a second embodiment of a defrosting method for a refrigerator according to the present invention;

fig. 6 is a specific control flowchart of a second embodiment of the refrigerator defrosting method according to the present invention.

In the above figures: a compressor 1; a condenser 2; a solenoid valve 3; a cryocapillary 9; refrigerating the capillary tube 8; a freezing evaporator 5; a refrigerating evaporator 4; a freezing fan 7; a refrigerating fan 6; a control system 10; a setting module 20; a temperature acquisition module 40; a timing module 30; a judging module 50; a control module 60.

Detailed Description

The present invention is further described below in conjunction with specific examples so that those skilled in the art may better understand the invention and practice it, but the scope of the invention claimed is not limited to the scope described in the detailed description. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

It should be noted that the description relating to "first", "second", etc. in the present invention is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.

In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Example one

A refrigerator includes a refrigerating compartment and a freezing compartment; the refrigerator is provided with a refrigerator defrosting system; as shown in fig. 1, the refrigerating system of the dual system refrigerator includes a compressor 1, a condenser 2 communicated with an outlet of the compressor 1, an electromagnetic valve 3 for switching an operating state of the refrigerating system, a freezing capillary tube 9 and a refrigerating capillary tube 8, a freezing evaporator 5 and a refrigerating evaporator 4 for respectively providing cooling capacity to the freezing compartment and the refrigerating compartment, a freezing fan 7 and a refrigerating fan 6 for respectively diffusing the cooling capacity generated by the freezing evaporator 5 and the refrigerating evaporator 4 into the freezing compartment and the refrigerating compartment, and a freezing heating wire and a refrigerating heating wire for respectively defrosting the freezing evaporator 5 and the refrigerating evaporator 4. Wherein, compressor 1, condenser 2, solenoid valve 3, freezing capillary 9 and freezing evaporimeter 5 establish ties in proper order and form the return circuit, and the both ends of freezing capillary 9 are parallelly connected with cold-stored branch road, and cold-stored branch road is including cold-stored capillary 8 and the cold-stored evaporimeter 4 of establishing ties.

As shown in fig. 2, the refrigerator is provided with a control system 10 for controlling the operation states of various components of the refrigerator to control the refrigerator. The control system 10 includes a setting module 20, a temperature collecting module 40, a timing module 30, a determining module 50, and a control module 60.

The setting module 20 is configured to obtain various standard parameters of the refrigerator operation, where the standard parameters include, but are not limited to, a temperature parameter, a time parameter, and the like. In this embodiment, the setting module 20 obtains the freezing and precooling temperature threshold T during defrosting _D0 And a cold storage precooling temperature threshold value T _C0 Priority freezing time threshold t _d0 And a threshold value t of refrigeration time _c0 (ii) a Wherein the freezing precooling temperature threshold value T _D0 It cannot be below the set minimum temperature point for a freeze shutdown to ensure that freezing is avoided while lowering the temperature. Similarly, a refrigerated precooling temperature threshold T _C0 And can not be lower than the set minimum temperature point of refrigeration shutdown so as to ensure that the temperature is reduced and the icing is avoided. The setting module 20 is also used for obtaining the original control program of the refrigerator, which comprises a refrigerating chamberA control program for the chamber and a control program for the freezing chamber; namely, whether the refrigerating chamber or the refrigerating chamber and the freezing chamber of the refrigerator refrigerates is judged according to the real-time temperature in the refrigerating chamber and the freezing chamber.

The temperature acquisition module 40 is used for acquiring the freezing and precooling temperature T during precooling of the freezing chamber in real time _D1 And the cold storage pre-cooling temperature T during the pre-cooling of the cold storage chamber _C1 . Specifically, the temperature acquisition module 40 may include a freezing sensor disposed in the freezing chamber and a refrigerating sensor disposed in the refrigerating chamber, the freezing sensor being used for sensing and obtaining the freezing pre-cooling temperature T _D1 A refrigeration sensor for sensing and obtaining a refrigeration pre-cooling temperature T _C1 。

Of course, in other embodiments, the freezing sensors and the refrigerating sensors are both provided in plurality, and the temperature acquisition module 40 further includes a data processing unit, where the data processing unit is configured to receive temperature values of the freezing compartments respectively sensed by the freezing sensors and process the temperature values according to preset logic to obtain a freezing pre-cooling temperature T _D1 (ii) a The data processing unit is also used for receiving the temperature values of the refrigerating chambers respectively sensed by the refrigerating sensors and processing the temperature values according to preset logic to obtain a refrigerating precooling temperature T _C1 。

The timing module 30 is used to record time, and may be specifically configured as a timer. In this embodiment, the timing module 30 performs the time t of preferential freezing after the defrosting of the freezing evaporator is finished in the whole defrosting process _d1 And the preferential refrigerating time t after the end of the refrigeration defrosting _c1 And (6) timing.

The determining module 50 is used for receiving the freezing precooling temperature T collected by the temperature collecting module 40 _D1 And a cold storage precooling temperature T _C1 And judging the freezing precooling temperature T _D1 And a refrigeration pre-cooling temperature T _C1 Respectively corresponding freezing precooling temperature threshold values T _D0 And a cold storage precooling temperature threshold value T _C0 The magnitude relationship of (a). In addition, the determining module 50 is used for receiving the priority freezing time t collected by the timing module 30 _d1 And a preferred refrigeration duration t _c1 And judging the preferential freezing time period t _d1 And a preferred refrigeration duration t _c1 Priority freezing time threshold t respectively corresponding to the two _d0 And a threshold value t of refrigeration time _c0 The magnitude relationship of (1).

The control module 60 is connected to the setting module 20, the temperature collecting module 40, the timing module 30 and the judging module 50, performs information interaction with the setting module 20, the temperature collecting module 40, the timing module 30 and the judging module 50, and controls the on-off states of the refrigerating system, the freezing fan 7, the refrigerating fan 6, the freezing heating wire, the refrigerating heating wire and the like.

Specifically, as shown in fig. 3 to 4, the defrosting method for the refrigerator includes independently defrosting the freezing evaporator, performing refrigeration preferentially after defrosting of the freezing evaporator is finished, independently performing defrosting of the refrigerating evaporator, and performing refrigeration preferentially after defrosting of the refrigerating evaporator is finished. The method comprises the following specific steps:

s1: determining that the defrosting condition of the refrigeration evaporator is met;

wherein the defrosting condition of the refrigeration evaporator can be that the accumulated running time of the refrigeration evaporator 5 reaches a preset threshold value; it is not particularly limited and may be set according to actual needs.

S2: pre-cooling in a compartment; the method specifically comprises the following steps:

s21: pre-cooling in a cold storage chamber; the method comprises the following steps:

s211: the electromagnetic valve 3 is switched to the cold storage side, and the compressor 1 works;

s212: refrigeration sensor monitoring freezing precooling temperature T _C1 And will refrigerate the precooling temperature T _C1 With a preset refrigerated pre-cooling temperature threshold value T _C0 Carrying out comparison;

s213: judgment of T _C1 ≤T _C0 Is it a question of If yes, go to step S22; if not, go to step S212;

s22: pre-cooling in a freezing chamber; the method comprises the following steps:

s221: the electromagnetic valve 3 is switched to the freezing side, and the compressor 1 works;

s222: freezing sensor for monitoring freezing precooling temperature T _D1 And will freeze the precooling temperature T _D1 With a preset freezing precooling temperature threshold value T _D0 Comparing;

s223: judgment of T _D1 ≤T _D0 Is there a If yes, executing step S3; if not, go to step S222;

s3: independently defrosting the refrigeration evaporator; the method comprises the following steps: closing the electromagnetic valve 3, and working the freezing heating wire until the defrosting of the freezing evaporator is finished;

in step S3, the refrigerating compartment cannot be cooled; however, since the cold storage compartment is precooled in step S21 before step S3, the temperature of the cold storage compartment can be kept in a low range during the step S3.

S4: freezing and preferentially refrigerating; the method specifically comprises the following steps:

s41: the timer starts to time;

s42: the electromagnetic valve 3 is switched to the freezing side, the compressor 1 works, and the freezing fan 7 works;

s43: time period t of preferential freezing _d1 Not less than the threshold t of the preferential freezing time _d0 Is there a If yes, go to step S44; if not, executing step S42;

s44: resetting the timer;

in this embodiment, the priority freezing time threshold t _d0 Setting the time to be 30-45 min.

As another practicable manner, the freezing priority cooling of step S4 may be set to: and operating the original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

In the above, when the single freezing evaporator of the S3 is defrosted, the pre-cooling of the refrigerating chamber of the S21 and the pre-cooling of the freezing chamber of the S22 are firstly carried out so as to reduce the initial temperature of the refrigerating chamber and the freezing chamber when the refrigerator is defrosted; step S4 is executed after S3, freezing priority refrigeration is carried out, the temperature rise in the freezing chamber after the freezing evaporator defrosts can be effectively controlled, and the temperature rise in the freezing chamber before and after defrosting is avoided to exceed 3K; the arrangement of the steps can ensure that the temperature change before and after defrosting is small, and effectively reduce the influence of the defrosting process on the temperature in the freezing chamber, thereby ensuring the fresh-keeping effect of the freezing chamber.

S5: defrosting of the refrigeration evaporator is independently carried out; the method comprises the following steps: closing the electromagnetic valve 3, and operating the refrigerating heating wire and/or the refrigerating fan until defrosting of the refrigerating evaporator is finished;

in step S5, the freezer compartment is normally cooled, and the temperature of the freezer compartment is effectively ensured.

S6: refrigerating preferentially; the method specifically comprises the following steps:

s61: the timer starts to time;

s62: the electromagnetic valve 3 is switched to the refrigerating side, the compressor 1 works, and the refrigerating fan 6 works;

s63: priority refrigeration time period t _c1 Not less than the threshold t of preferential refrigeration time _c0 Is there a If yes, go to step S64; if not, executing step S62;

s64: resetting the timer;

in the above step, after S5, the step S6 of performing the refrigeration with priority can effectively control the temperature rise in the refrigeration compartment after the defrosting of the refrigeration evaporator, and avoid the temperature rise in the refrigeration compartment before and after the defrosting; the arrangement of the steps can ensure that the temperature change before and after defrosting is small, and effectively reduce the influence of the defrosting process on the temperature in the refrigerating chamber, thereby ensuring the fresh-keeping effect of the refrigerating chamber.

In step S4, the refrigeration evaporator performs refrigeration with priority after defrosting. And after the step S4, the step S5 is executed to independently perform refrigeration evaporator defrosting, so that the mutual influence between the refrigeration evaporator defrosting and the refrigeration evaporator defrosting is avoided.

S7: the original control program for the refrigerant system is run.

In this embodiment, the defrosting of the freezing chamber is performed separately, and then the defrosting of the refrigerating chamber is performed separately, that is, the defrosting of the freezing chamber and the refrigerating chamber is performed at different times. Precooling the cold storage chamber and the freezing chamber in sequence before defrosting to reduce the initial defrosting temperature; after defrosting of the freezing chamber or the refrigerating chamber is finished, the corresponding chamber is preferentially refrigerated so as to quickly cool the corresponding chamber; thereby reducing the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting.

Compared with the staggered defrosting method in the invention, the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting in different methods is changed as follows:

the comparison of the data in the table shows that the defrosting method of the invention effectively reduces the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting.

Example two

The second embodiment has the same principle as the first embodiment, and the main difference from the first embodiment is that the defrosting method of the refrigerator is different. Specifically, as shown in fig. 5 to fig. 6, the defrosting method for a refrigerator in this embodiment includes performing defrosting separately for a refrigerating evaporator, performing refrigerating preferential cooling after defrosting of the refrigerating evaporator is finished, then performing defrosting separately for a freezing evaporator, and performing freezing preferential cooling after defrosting of the freezing evaporator is finished. The method comprises the following specific steps:

s' 1: determining that the defrosting condition is met;

wherein the defrosting condition may be that the accumulated running time of the refrigeration evaporator 4 reaches a predetermined threshold; it is not particularly limited and may be set according to actual needs.

S' 2: pre-cooling in a cold storage chamber; the method comprises the following steps:

s' 21: the electromagnetic valve 3 is switched to the cold storage side, and the compressor 1 works;

s' 22: refrigeration sensor monitoring freezing precooling temperature T _C1 And will refrigerate the precooling temperature T _C1 With a preset refrigerated pre-cooling temperature threshold value T _C0 Comparing;

s' 23: judgment of T _C1 ≤T _C0 Is there a If yes, executing step S' 3; if not, executing the step S' 22;

s' 3: defrosting of the refrigeration evaporator is independently carried out; the method comprises the following steps: closing the electromagnetic valve 3, and operating the refrigerating heating wire and/or the refrigerating fan until defrosting of the refrigerating evaporator is finished;

in step S' 3, the freezing chamber is normally cooled, and the temperature of the freezing chamber is effectively ensured.

S' 4: refrigerating preferentially; the method specifically comprises the following steps:

s' 41: starting timing by a timer;

s' 42: the electromagnetic valve 3 is switched to the refrigerating side, the compressor 1 works, and the refrigerating fan 6 works;

s' 43: priority refrigeration time period t _c1 Not less than the threshold t of preferential refrigeration time _c0 Is there a If yes, executing step S' 44; if not, executing the step S' 42;

s' 44: resetting the timer;

in the above step, before defrosting of the refrigerating evaporator is finished by the S '3, precooling is carried out in the refrigerating chamber of the S' 2 so as to reduce the initial temperature of the refrigerating chamber during defrosting of the refrigerator; after S '3 is finished, the step S' 4 of refrigeration priority refrigeration is executed, so that the temperature rise in the refrigerating chamber after the defrosting of the refrigerating evaporator can be effectively controlled, and the large temperature rise of the refrigerating chamber before and after defrosting is avoided; the arrangement of the steps can ensure that the temperature change before and after defrosting is small, and effectively reduces the influence of the defrosting process on the temperature in the refrigerating chamber, thereby ensuring the fresh-keeping effect of the refrigerating chamber.

S' 5: pre-cooling in a freezing chamber; the method comprises the following steps:

s' 51: the electromagnetic valve 3 is switched to the freezing side, and the compressor 1 works;

s' 52: freezing sensor for monitoring freezing precooling temperature T _D1 And will freeze the precooling temperature T _D1 With a preset freezing precooling temperature threshold value T _D0 Comparing;

s' 53: judgment of T _D1 ≤T _D0 Is there a If yes, executing step S' 6; if not, executing the step S' 52;

s' 6: independently defrosting the refrigeration evaporator; the method comprises the following steps: closing the electromagnetic valve 3, and working the freezing heating wire until the defrosting of the freezing evaporator is finished;

in step S' 6, the refrigerating compartment cannot be cooled; however, since the refrigerating compartment is precooled in step S ' 4 before step S ' 6, the temperature of the refrigerating compartment can be kept in a low range during step S ' 6.

S' 7: freezing and preferentially refrigerating; the method specifically comprises the following steps:

s' 71: the timer starts to time;

s' 72: the electromagnetic valve 3 is switched to the freezing side, the compressor 1 works, and the freezing fan 7 works;

s' 73: time period t of preferential freezing _d1 Not less than the threshold t of the preferential freezing time _d0 Is there a If yes, executing step S' 74; if not, executing the step S' 72;

s' 74: resetting the timer;

in this embodiment, the priority freezing time threshold t _d0 Setting for 30-45 min.

As another practicable manner, the freezing priority cooling of step S7 may be set to: and operating the original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

In the above step, the pre-cooling of the S '5 freezing chamber is carried out before the defrosting of the S' 6 single freezing evaporator is carried out so as to reduce the initial temperature of the freezing chamber during the defrosting of the refrigerator; after S '6 is finished, the step S' 7 is executed for refrigeration priority, so that the temperature rise in the refrigerating chamber after the defrosting of the refrigerating evaporator can be effectively controlled, and the temperature rise in the refrigerating chamber before and after the defrosting is avoided to exceed 3K; the arrangement of the steps can ensure that the temperature change before and after defrosting is small, and effectively reduce the influence of the defrosting process on the temperature in the freezing chamber, thereby ensuring the fresh-keeping effect of the freezing chamber.

S' 8: the original control program for the refrigerant system is run.

In this embodiment, the refrigerating chamber defrosting is performed separately, and then the freezing chamber defrosting is performed separately, that is, the refrigerating chamber and the freezing chamber defrosting are performed at different times. Precooling the corresponding chamber before defrosting by the freezing evaporator or the refrigerating evaporator so as to reduce the initial defrosting temperature; after defrosting of the freezing chamber or the refrigerating chamber is finished, the corresponding chamber is preferentially refrigerated so as to quickly cool the corresponding chamber; thereby reducing the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting.

In the invention, defrosting of one of a refrigeration evaporator and a freezing evaporator is independently carried out, and then preferential refrigeration is carried out on a corresponding chamber; then, independently defrosting the other evaporator, and preferentially refrigerating the corresponding chamber after defrosting; namely, the defrosting of the refrigerating chamber and the freezing chamber is carried out at different time. In addition, the corresponding compartments are pre-cooled before the respective defrosting of the refrigeration evaporator or the freezing evaporator so as to reduce the initial defrosting temperature; after the defrosting of the freezing chamber or the refrigerating chamber is finished, the corresponding chamber is preferentially refrigerated so as to quickly cool the corresponding chamber; thereby reducing the temperature rise of the refrigerating chamber and the freezing chamber before and after defrosting.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention.

Claims

1. The defrosting method of the refrigerator is characterized in that:

the refrigerator comprises a compressor, a condenser, an electromagnetic valve, a freezing capillary tube and a freezing evaporator which are sequentially connected in series to form a loop, wherein two ends of the freezing capillary tube are connected with a refrigerating branch in parallel, and the refrigerating branch comprises a refrigerating capillary tube and a refrigerating evaporator which are connected in series; the defrosting method comprises the following steps:

pre-cooling in a cold storage chamber; after the pre-cooling of the refrigerating chamber is finished, one of the freezing evaporator and the refrigerating evaporator is independently defrosted and then preferentially refrigerates the corresponding chamber, and then the other evaporator is independently defrosted and sequentially preferentially refrigerates the corresponding chamber;

the cold storage compartment pre-cooling comprises:

monitoring the Cold storage Pre-Cooling temperature T _C1 And the refrigerated precooling temperature T is set _C1 With a preset refrigerated pre-cooling temperature threshold value T _C0 Carrying out comparison;

2. The refrigerator defrosting method according to claim 1, wherein: the refrigerator defrosting method comprises the following steps: pre-cooling in a freezing chamber; and after the pre-cooling of the refrigerating chamber is finished, the refrigerating chamber is pre-cooled, after the pre-cooling of the refrigerating chamber is finished, the freezing evaporator is independently defrosted, then the refrigerating preferential refrigeration is carried out, and then the refrigerating evaporator is independently defrosted and the refrigerating preferential refrigeration is successively carried out.

3. The refrigerator defrosting method according to claim 1, characterized in that: the refrigerator defrosting method comprises the following steps: pre-cooling in a freezing chamber; after the pre-cooling of the refrigerating chamber is finished, the refrigerating evaporator is independently defrosted and then refrigerating priority refrigeration is carried out, after the refrigerating priority refrigeration is finished, the refrigerating chamber is firstly pre-cooled, then the refrigerating evaporator is independently defrosted and freezing priority refrigeration is carried out successively.

4. The refrigerator defrosting method according to claim 2 or 3, characterized in that: the freezer compartment pre-cooling comprises:

monitoring the freezing Pre-Cooling temperature T _D1 And the freezing precooling temperature T is set _D1 With a preset freezing precooling temperature threshold value T _D0 Carrying out comparison;

5. The refrigerator defrosting method according to claim 2 or 3, characterized in that: the defrosting of the freezing evaporator comprises closing an electromagnetic valve, and working a freezing heating wire until the defrosting of the freezing evaporator is finished; and the defrosting of the refrigeration evaporator comprises the closing of an electromagnetic valve, and the working of a refrigeration heating wire and/or a refrigeration fan is completed when the defrosting of the refrigeration evaporator is finished.

6. The refrigerator defrosting method according to claim 2 or 3, characterized in that: the freezing priority refrigeration comprises the following steps:

monitoring priority freeze duration t _d1 And the preferential freezing time period t is set _d1 And a preset priority freezing time threshold value t _d0 Comparing;

7. The refrigerator defrosting method according to claim 2 or 3, characterized in that: the refrigeration priority refrigeration is specifically as follows: and operating the original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

8. The refrigerator defrosting method according to claim 2 or 3, characterized in that: the refrigeration priority cooling comprises:

9. A refrigerator, characterized in that: the refrigerator is used for realizing the defrosting method of the refrigerator as claimed in any one of claims 1 to 8.