CN113970213B

CN113970213B - Refrigerator defrosting method and refrigerator

Info

Publication number: CN113970213B
Application number: CN202010709717.9A
Authority: CN
Inventors: 彭洪祥; 孙彬
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2023-07-04
Anticipated expiration: 2040-07-22
Also published as: CN113970213A

Abstract

The invention provides a defrosting method of a refrigerator, which comprises a compressor, a condenser, an electromagnetic valve, a refrigeration capillary tube and a refrigeration evaporator which are sequentially connected in series to form a loop, wherein two ends of the refrigeration capillary tube are connected in parallel with a freezing branch, and the freezing branch comprises the freezing capillary tube and the refrigeration evaporator which are connected in series; the defrosting method comprises the following steps: one of the freezing evaporator and the refrigerating evaporator firstly performs defrosting independently and then performs preferential refrigeration on the corresponding compartment, and then the other evaporator performs defrosting independently and sequentially performs preferential refrigeration on the compartment corresponding to the other evaporator; according to the invention, defrosting of the freezing compartment and the refrigerating compartment is performed at staggered time, and after defrosting of the freezing compartment or defrosting of the refrigerating compartment is finished, the corresponding compartment is refrigerated preferentially so as to quickly cool the corresponding compartment; thereby reducing the temperature rise of the refrigerating compartment and the freezing compartment 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 refrigerating system consisting of a plurality of evaporators and a plurality of groups of throttling capillary tubes is arranged in a multi-system refrigerator, and the capillary tubes are switched by electromagnetic valves or electric valves to respectively refrigerate different evaporators. Multiple evaporators of the multi-system frostless refrigerator need to be defrosted, a refrigeration evaporator generally adopts blowing defrosting or blowing defrosting plus auxiliary heating defrosting, and a freezing evaporator generally adopts electric heating defrosting.

According to GB/T8059 standard, when the storage temperature is tested, the room temperature rise requirement of the freezing room is not more than 3K, for example, the temperature of the freezing room in stable operation is-19 ℃, and the highest temperature of the freezing room in defrosting and recovery periods is not more than-16 ℃;

the defrosting period of the freezing compartment is 96h at the longest and 12h at the shortest according to the GB/T8059 standard; the refrigerating compartment has a relatively high water content, and meanwhile, the defrosting power is relatively low or only air-blown defrosting is adopted, so that defrosting is avoided, and the defrosting period is generally relatively short; the refrigerating compartment adopts blown frost, the general defrosting time is about 80-100min, and the general defrosting time of freezing adopts hot defrosting, is about 30min;

the defrosting cycles of the refrigerating room and the freezing room are different, the defrosting time is also different, and the mutual influence occurs: because the evaporators of the system using series-parallel connection are interrelated and not completely independent, interactions are considered: when the downstream evaporator in the flow direction of the refrigerant is frosted, the upstream evaporator cannot normally refrigerate, and when the upstream evaporator in the flow direction of the refrigerant is frosted, the downstream evaporator can normally refrigerate. At present, synchronous defrosting of a freezing room and a refrigerating room is mainly adopted, and specifically comprises the following steps: after the defrosting condition of the freezing evaporator is reached, refrigerating and pre-cooling to stop, then refrigerating and pre-cooling to stop or lower, then entering the freezing and refrigerating synchronous defrosting, starting a press after the defrosting of the freezing evaporator is finished for 5-10min, refrigerating independently for 30min, and then entering a freezing and refrigerating temperature control program (refrigerating and refrigerating preferentially); in the defrosting process, on one hand, the refrigerating temperature rise is larger due to the fact that refrigeration cannot be performed due to the requirements of defrosting time and refrigerating forced refrigeration time after defrosting; on the other hand, the temperature rise of the freezing compartment is large in the defrosting process, and after the defrosting of the freezing evaporator is finished and the forced freezing is finished, the freezing compartment cannot continue to refrigerate because the temperature of the refrigerating compartment is higher and the refrigerating compartment has higher refrigerating priority, and the freezing compartment can only refrigerate again after the refrigerating is finished, so that the temperature rise of the freezing compartment is large; the temperature of the refrigerating compartment and the refrigerating compartment is higher after the synchronous defrosting, refrigeration is needed, and the other temperature is increased no matter the refrigerating compartment and the refrigerating compartment are subjected to refrigeration preferentially or refrigeration.

In view of this, the present invention has been proposed.

Disclosure of Invention

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

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

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

one of the freezing evaporator and the refrigerating evaporator firstly performs defrosting independently and then performs preferential refrigeration on the corresponding compartment, and then the other evaporator performs defrosting independently and sequentially performs preferential refrigeration on the compartment corresponding to the other evaporator.

Preferably, the refrigerator defrosting method comprises the following steps: precooling a freezing compartment and precooling a refrigerating compartment; after the precooling of the freezing compartment is finished, defrosting of the freezing evaporator is carried out independently, and then freezing is carried out for preferential refrigeration; and then precooling the refrigerating compartment, and after the precooling of the refrigerating compartment is finished, defrosting the refrigerating evaporator independently and refrigerating in sequence for preferential refrigeration.

Preferably, the refrigerator defrosting method comprises the following steps: precooling a refrigerating compartment and precooling a freezing compartment; and after the refrigeration preferential refrigeration is finished, the refrigeration compartment is precooled, and then the refrigeration evaporator is used for defrosting and the refrigeration preferential refrigeration is carried out successively.

Preferably, the pre-cooling of the refrigerating compartment comprises:

switching the electromagnetic valve to the refrigerating side, and operating the compressor;

monitoring the chilled precooling temperature T _C1 And the cold storage precooling temperature T _C1 With a preset refrigerating precooling temperature threshold T _C0 Comparing;

when T is _C1 ≤T _C0 And when the pre-cooling of the refrigerating compartment is finished.

Preferably, the freezing compartment pre-cooling comprises:

switching the electromagnetic valve to the freezing side, and operating the compressor;

monitoring the chilled precooling temperature T _D1 And pre-cooling the frozen food at the temperature T _D1 And a preset freezing precooling temperature threshold T _D0 Comparing;

when T is _D1 ≤T _D0 And when the precooling of the freezing compartment is finished.

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

Preferably, the refrigeration priority refrigeration comprises the following steps:

switching the electromagnetic valve to the freezing side, operating the compressor and operating the freezing fan;

monitoring preferential freezing period t _d1 And the preferential freezing time period t _d1 With a preset preferential freezing time threshold t _d0 Comparing;

when t _d1 ≥t _d0 And when the refrigeration priority refrigeration is finished.

Preferably, the refrigeration priority refrigeration specifically comprises: and (3) running an original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

Preferably, the refrigeration preferential refrigeration includes:

switching the electromagnetic valve to the refrigerating side, operating the compressor and operating the refrigerating fan;

monitoring the preferential refrigeration time period t _c1 And the preferential refrigeration time period t _c1 And a preset priority refrigerating time threshold t _c0 Comparing;

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

A refrigerator for implementing the refrigerator defrosting method described above.

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

the refrigerator comprises a compressor, a condenser, an electromagnetic valve, a refrigeration capillary tube and a refrigeration evaporator which are sequentially connected in series to form a loop, wherein the two ends of the refrigeration capillary tube are connected with freezing branches in parallel, and the freezing branches comprise the freezing capillary tube and the freezing evaporator which are connected in series; the defrosting method comprises the following steps: one of the freezing evaporator and the refrigerating evaporator firstly performs defrosting independently and then performs preferential refrigeration on the corresponding compartment, and then the other evaporator performs defrosting independently and sequentially performs preferential refrigeration on the compartment corresponding to the other evaporator; according to the invention, defrosting of the freezing compartment and the refrigerating compartment is performed at staggered time, and after defrosting of the freezing compartment or defrosting of the refrigerating compartment is finished, the corresponding compartment is refrigerated preferentially so as to quickly cool the corresponding compartment; thereby reducing the temperature rise of the refrigerating compartment and the freezing compartment before and after defrosting.

Drawings

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

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

fig. 3 is an overall control flow chart of a refrigerator defrosting method according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating a control procedure of a refrigerator defrosting method according to an embodiment of the present invention;

fig. 5 is an overall control flow chart of a refrigerator defrosting method according to a second embodiment of the present invention;

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

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

Detailed Description

The present invention will be further described with reference to specific examples so that those skilled in the art may better understand the present invention and practice it, but the scope of the present invention is not limited to the scope described in the specific embodiments. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

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

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Example 1

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 communicating with an outlet of the compressor 1, a solenoid valve 3 for switching an operation state of the refrigerating system, a freezing capillary 9 and a refrigerating capillary 8, a freezing evaporator 5 and a refrigerating evaporator 4 for providing cold energy to the freezing compartment and the refrigerating compartment, respectively, a freezing fan 7 and a refrigerating fan 6 for diffusing the cold energy generated from the freezing evaporator 5 and the refrigerating evaporator 4 into the freezing compartment and the refrigerating compartment, respectively, and a freezing heating wire and a refrigerating heating wire for defrosting the freezing evaporator 5 and the refrigerating evaporator 4, respectively. The compressor 1, the condenser 2, the electromagnetic valve 3, the refrigeration capillary tube 8 and the refrigeration evaporator 4 are sequentially connected in series to form a loop, the two ends of the refrigeration capillary tube 8 are connected in parallel with a freezing branch, and the freezing branch comprises a freezing capillary tube 9 and the freezing evaporator 5 which are connected in series.

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

The setting module 20 is configured to obtain various standard parameters of the refrigerator operation, including, but not limited to, a temperature parameter, a time parameter, and the like. In this embodiment, the setting module 20 obtains the threshold T of the chilled pre-cooling temperature during the defrosting process _D0 Threshold value T of refrigerated precooling temperature _C0 Preferential freezing time threshold t _d0 Threshold value t of refrigerating time _c0 The method comprises the steps of carrying out a first treatment on the surface of the Wherein, the freezing precooling temperature threshold value T _D0 Cannot be below the minimum temperature point of the set freeze shutdown to ensure that freezing is avoided while the temperature is reduced. Likewise, the threshold value T of the cold-storage precooling temperature _C0 And cannot be lower than the set lowest temperature point of refrigeration shutdown to ensure that freezing is avoided while the temperature is reduced. The setting module 20 alsoThe method comprises the steps of acquiring an original control program of the refrigerator, wherein the original control program comprises a control program of a refrigerating compartment and a control program of a freezing compartment; whether the refrigerating compartment is refrigerated or not or whether the refrigerating compartment and the refrigerating compartment are refrigerated at the same time is judged according to the real-time temperature in the refrigerating compartment and the refrigerating compartment of the refrigerator.

The temperature acquisition module 40 is used for acquiring the freezing pre-cooling temperature T during pre-cooling of the freezing compartment in real time _D1 Refrigeration precooling temperature T during precooling of refrigeration compartment _C1 . Specifically, the temperature acquisition module 40 may include a freezing sensor disposed in the freezing compartment and a refrigerating sensor disposed in the refrigerating compartment, the freezing sensor being configured to sense and obtain the pre-freezing temperature T _D1 The refrigeration sensor is used for sensing and obtaining the refrigeration precooling temperature T _C1 。

Of course, in other embodiments, the freezing sensors and the refrigerating sensors are provided in plural, and the temperature acquisition module 40 further includes a data processing unit for receiving the temperature values of the freezing compartments sensed by the freezing sensors and processing the temperature values according to a preset logic to obtain the pre-freezing temperature T _D1 The method comprises the steps of carrying out a first treatment on the surface of the The data processing unit is also used for receiving the temperature values of the refrigerating compartments respectively sensed by the plurality of refrigerating sensors and processing the plurality of temperature values according to preset logic to obtain a refrigerating precooling temperature T _C1 。

The timing module 30 is used for recording time, and may be specifically configured as a timer. In this embodiment, the timer module 30 sets the preferential freezing time period t after the defrosting of the freezing evaporator is completed in the whole defrosting process _d1 Priority refrigerating time t after completion of refrigerating defrosting _c1 And (5) timing.

The judging module 50 is used for receiving the freezing pre-cooling temperature T acquired by the temperature acquisition module 40 _D1 Refrigeration precooling temperature T _C1 And judging the freezing precooling temperature T _D1 And refrigeration precooling temperature T _C1 Respectively corresponding to the freezing pre-cooling temperature threshold T _D0 Threshold value T of refrigerated precooling temperature _C0 Is a size relationship of (a). In addition, the judging module 50 is configured to receive the preferential freezing duration t collected by the timing module 30 _d1 Preferential coolingDuration t of time of storage _c1 And judging the preferential freezing time t _d1 And a preferential refrigerating period t _c1 Respectively corresponding to the priority freezing time threshold t _d0 Threshold value t of refrigerating time _c0 Is a size relationship of (a).

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, and 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 opening and closing states of the refrigerating system, the refrigerating fan 7, the refrigerating fan 6, the refrigerating and heating wire, and the like.

Specifically, as shown in fig. 3-4, the defrosting method of the refrigerator comprises the steps of independently performing defrosting of the freezing evaporator, performing freezing priority refrigeration after defrosting of the freezing evaporator, and then independently performing defrosting of the refrigerating evaporator, and performing refrigeration priority refrigeration after defrosting of the refrigerating evaporator. The method comprises the following specific steps:

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

wherein the freeze evaporator defrost condition may be the cumulative run time of the freeze evaporator 5 reaching a predetermined threshold; it is not particularly limited and may be set according to actual needs.

S2: precooling a freezing compartment; the method specifically comprises the following steps:

s21: the electromagnetic valve 3 is switched to the freezing side, and the compressor 1 works;

s22: freezing sensor monitors freezing precooling temperature T _D1 And pre-cooling the mixture at a temperature T _D1 And a preset freezing precooling temperature threshold T _D0 Comparing;

s23: judgment T _D1 ≤T _D0 ? If yes, executing step S3; if not, executing step S22;

s3: defrosting the freezing evaporator independently; the method comprises the following steps: the electromagnetic valve 3 is closed, and the refrigerating and heating wire works until defrosting of the refrigerating and evaporating device is finished;

in this step S3, the refrigerating compartment is normally refrigerated, and the temperature of the refrigerating compartment is effectively ensured.

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

s41: the timer starts to count;

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

s43: preferential freezing period t _d1 More than or equal to the threshold t of preferential freezing time _d0 ? If yes, go to step S44; if not, executing step S42;

s44: resetting the timer;

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

As another embodiment, the step S4 refrigeration priority refrigeration may be set as follows: and (3) running an original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

In the above way, when the single freezing evaporator is used for defrosting in S3, the pre-cooling of the freezing compartment in S2 is firstly carried out so as to reduce the initial temperature of the freezing compartment when the refrigerator is used for defrosting; after the step S3 is finished, the step S4 refrigeration is executed for preferential refrigeration, so that the temperature rise in the refrigerating compartment after defrosting of the refrigerating evaporator can be effectively controlled, and the temperature rise of the refrigerating compartment 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 reduces the influence of the defrosting process on the indoor temperature of the freezing compartment, thereby ensuring the fresh-keeping effect of the freezing compartment.

S5: precooling a refrigerating compartment; the method comprises the following steps:

s51: the electromagnetic valve 3 is switched to the refrigerating side, and the compressor 1 works;

s52: refrigeration sensor for monitoring refrigeration precooling temperature T _C1 And pre-cooling the cold storage temperature T _C1 With a preset refrigerating precooling temperature threshold T _C0 Comparing;

s53: judgment T _C1 ≤T _C0 ? If yes, executing step S6; if not, executing step S52;

s6: defrosting the refrigeration evaporator independently; the method comprises the following steps: the electromagnetic valve 3 is closed, and the refrigerating heating wire and/or the refrigerating fan work until the defrosting of the refrigerating evaporator is finished;

in this step S6, the freezing compartment cannot be cooled; however, the freezing compartment is preferentially cooled in step S4 before step S6, and the temperature of the freezing compartment can be kept in a low range during the step S6. S7: refrigerating and preferentially refrigerating; the method specifically comprises the following steps:

s71: the timer starts to count;

s72: the electromagnetic valve 3 is switched to the refrigerating side, the compressor 1 works, and the refrigerating fan 6 works;

s73: priority refrigerating time t _c1 More than or equal to the threshold t of the preferential refrigeration time _c0 ? If yes, go to step S74; if not, executing step S72;

s74: resetting the timer;

above, after finishing S6, the step S7 refrigeration is executed for preferential refrigeration, so that the temperature rise in the refrigeration compartment after defrosting of the refrigeration evaporator can be effectively controlled, and the temperature rise of the refrigeration compartment 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 indoor temperature of the refrigerating chamber, thereby ensuring the fresh-keeping effect of the refrigerating chamber.

The step S4 above performs the refrigeration priority refrigeration after the defrosting of the refrigeration evaporator. And after the step S4, the step S6 is executed to perform defrosting of the refrigeration evaporator independently, so that the mutual influence between defrosting of the refrigeration evaporator and defrosting of the refrigeration evaporator is avoided.

S8: the original control program of the refrigeration system is operated.

In this embodiment, the freezing compartment is firstly defrosted separately, and then the refrigerating compartment is defrosted separately, that is, the freezing compartment and the refrigerating compartment are defrosted at a time. Pre-cooling the corresponding compartments before defrosting of the freezing evaporator or the refrigerating evaporator so as to reduce the initial temperature of defrosting of the corresponding compartments; after defrosting of the freezing compartment or defrosting of the refrigerating compartment is finished, the corresponding compartment is subjected to preferential refrigeration so as to quickly cool the corresponding compartment; thereby reducing the temperature rise of the refrigerating compartment and the freezing compartment before and after defrosting.

Comparing the prior simultaneous defrosting method with the time-staggered defrosting method, the temperature rise changes of the refrigerating compartment and the freezing compartment before and after defrosting under different methods are as follows:

as can be seen from the comparison of the data in the table, the defrosting method provided by the invention can effectively reduce the temperature rise of the refrigerating compartment and the freezing compartment before and after defrosting.

Example two

The second embodiment is the same as the first embodiment in principle, and is different from the first embodiment in the defrosting method of the refrigerator. Specifically, as shown in fig. 5-6, the defrosting method of the refrigerator in this embodiment includes performing defrosting of the refrigeration evaporator alone, performing refrigeration to perform refrigeration priority refrigeration after defrosting of the refrigeration evaporator is finished, and performing defrosting of the refrigeration evaporator alone, performing refrigeration to perform refrigeration priority refrigeration after defrosting of the refrigeration evaporator is finished. The method comprises the following specific steps:

s' 1: determining that defrosting conditions are met;

wherein the defrosting condition may be that the accumulated operating 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: precooling a refrigerating compartment; the method comprises the following steps:

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

s' 22: refrigeration sensor for monitoring refrigeration precooling temperature T _C1 And pre-cooling the cold storage temperature T _C1 With a preset refrigerating precooling temperature threshold T _C0 Comparing;

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

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

in this step S' 3, the freezing compartment cannot be cooled.

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

s' 41: the timer starts to count;

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 refrigerating time t _c1 More than or equal to the threshold t of the preferential refrigeration time _c0 ? If yes, go to step S' 44; if not, executing the step S' 42;

s' 44: resetting the timer;

above, pre-cooling the refrigerating compartment S '2 is performed before the completion of defrosting of the refrigerating evaporator S' 3 alone, so as to reduce the initial temperature of the refrigerating compartment when the refrigerator is defrosted; after the step S '3 is finished, the step S' 4 refrigeration is carried out for preferential refrigeration, so that the temperature rise in the refrigerating compartment after defrosting of the refrigerating evaporator can be effectively controlled, and the temperature rise of the refrigerating compartment 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 indoor temperature of the refrigerating chamber, thereby ensuring the fresh-keeping effect of the refrigerating chamber.

S' 5: precooling a freezing compartment; 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 monitors freezing precooling temperature T _D1 And pre-cooling the mixture at a temperature T _D1 And a preset freezing precooling temperature threshold T _D0 Comparing;

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

s' 6: defrosting the freezing evaporator independently; the method comprises the following steps: the electromagnetic valve 3 is closed, and the refrigerating and heating wire works until defrosting of the refrigerating and evaporating device is finished;

in this step S' 6, the refrigerating compartment is normally refrigerated, and the temperature of the refrigerating compartment is effectively ensured.

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

s' 71: the timer starts to count;

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

s' 73: preferential freezing period t _d1 More than or equal to the threshold t of preferential freezing time _d0 ? If yes, go to step S' 74; if not, executing the step S' 72;

s' 74: resetting the timer;

As another embodiment, the step S7 refrigeration priority refrigeration may be set as follows: and (3) running an original control program of the freezing chamber until the temperature of the freezing chamber reaches the shutdown temperature.

Above, pre-cooling the S '5 freezing compartment before defrosting the S' 6 single freezing evaporator to reduce the initial temperature of the freezing compartment when defrosting the refrigerator; after the step S '6 is finished, the step S' 7 refrigeration is carried out for preferential refrigeration, so that the temperature rise in the freezing compartment after defrosting of the freezing evaporator can be effectively controlled, and the temperature rise of the freezing compartment 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 reduces the influence of the defrosting process on the indoor temperature of the freezing compartment, thereby ensuring the fresh-keeping effect of the freezing compartment.

S' 8: the original control program of the refrigeration system is operated.

In this embodiment, the refrigerating compartment is firstly frosted separately, and then the freezing compartment is frosted separately, that is, the refrigerating compartment and the freezing compartment are frosted at regular time. Pre-cooling the corresponding compartments before defrosting of the freezing evaporator or the refrigerating evaporator so as to reduce the initial temperature of defrosting; after defrosting of the freezing compartment or defrosting of the refrigerating compartment is finished, the corresponding compartment is subjected to preferential refrigeration so as to quickly cool the corresponding compartment; thereby reducing the temperature rise of the refrigerating compartment and the freezing compartment before and after defrosting.

In the invention, defrosting of one of the refrigeration evaporator and the freezing evaporator is carried out independently, and then preferential refrigeration is carried out on the corresponding compartments; then defrosting the other evaporator independently, and carrying out preferential refrigeration on the corresponding compartments after defrosting; namely, defrosting the refrigerating compartment and the freezing compartment is performed at staggered time. In addition, pre-cooling the corresponding compartments before defrosting of the refrigeration evaporator or the freezing evaporator respectively so as to reduce the initial temperature of defrosting; after defrosting of the freezing compartment or defrosting of the refrigerating compartment is finished, the corresponding compartment is refrigerated preferentially so as to cool the corresponding compartment rapidly; thereby reducing the temperature rise of the refrigerating compartment and the freezing compartment before and after defrosting.

The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

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

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

one of the freezing evaporator and the refrigerating evaporator firstly performs defrosting independently and then performs preferential refrigeration on the corresponding compartment, and then the other evaporator performs defrosting independently and sequentially performs preferential refrigeration on the compartment corresponding to the other evaporator;

the defrosting method comprises the steps of pre-cooling a refrigeration compartment, and after the pre-cooling of the refrigeration compartment is finished, defrosting a refrigeration evaporator independently and refrigerating in sequence for preferential refrigeration;

the pre-cooling of the refrigerating compartment comprises the following steps:

monitoring the refrigeration precooling temperature T _C1 And the cold storage precooling temperature T _C1 With a preset refrigerating precooling temperature threshold T _C0 Comparing;

2. The refrigerator defrosting method according to claim 1, wherein: the refrigerator defrosting method comprises the following steps: precooling a freezing compartment;

after the precooling of the freezing compartment is finished, the freezing evaporator is firstly used for defrosting independently and then used for freezing and preferential refrigeration; and then precooling the refrigerating compartment.

3. The refrigerator defrosting method according to claim 1, wherein: the refrigerator defrosting method comprises the following steps: precooling a freezing compartment;

after the refrigeration priority refrigeration is finished, the freezing compartment is pre-cooled, and then the freezing evaporator is used for defrosting independently and the refrigeration priority refrigeration is carried out successively.

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

when T is _D1 ≤T _D0 And when the precooling of the freezing compartment is finished, the defrosting of the freezing evaporator is independently carried out.

5. A refrigerator defrosting method according to claim 2 or 3, characterized in that: the defrosting of the freezing evaporator comprises the steps that an electromagnetic valve is closed, and a freezing heating wire works until defrosting of the freezing evaporator is finished; the defrosting of the refrigeration evaporator comprises the step of closing an electromagnetic valve, and the refrigeration heating wire and/or the refrigeration fan work until the defrosting of the refrigeration evaporator is finished.

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

7. A refrigerator defrosting method according to claim 2 or 3, characterized in that: the refrigeration priority refrigeration specifically comprises the following steps: the original control program of the freezing compartment is operated until the temperature of the freezing compartment reaches the shutdown temperature; the original control program comprises a control program of a refrigerating compartment and a control program of a freezing compartment.

8. A refrigerator defrosting method according to claim 1 or 2 or 3, characterized in that: the refrigeration preferential refrigeration comprises:

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