CN108120210B - Defrosting control method, system and refrigerator for three-system refrigerator - Google Patents

Abstract

The invention provides a defrosting control method for a three-system refrigerator. The three-system refrigerator adopts a series-parallel three-cycle structure, and the control method includes the following steps: after the defrosting process ends, the compressor is turned on after a delay of T1 time; Compressor, judge whether the absolute value of the difference between the temperature t1 of the air outlet sensor of the variable temperature room and the temperature t2 of the sensor of the variable temperature room is less than the preset difference range; T2 time; if the judgment result is no, the solenoid valve switches on the freezing evaporator and the variable temperature evaporator, and the temperature and freezing are simultaneously cooled for the T3 time. The control method can switch the solenoid valve to the variable temperature branch when the temperature difference exceeds the preset difference range, so as to cool the variable room in advance, effectively control the load temperature rise of the variable room during defrosting, and is conducive to shortening the The time-consuming recovery period reduces the energy consumption of the refrigerator.

Description

Defrosting control method, system and refrigerator for three-system refrigerator

technical field

The invention relates to the technical field of refrigerators, in particular to a defrosting control method, system and refrigerator for a three-system refrigerator.

Background technique

At present, the freezer compartment of the existing series-parallel three-system refrigerator is usually shielded by a fan. After defrosting, the refrigerant first flows through the freezer evaporator for pre-cooling, and the evaporator is pre-cooled before supplying air to the compartment. Generally, the freezer evaporator will Set the fan shield to effectively prevent the hot air after defrosting from entering the freezer, so as to control the temperature rise of the freezer during the defrosting and recovery period.

However, for refrigerators without fan shielding, especially refrigerators without bottom cooling and using a combination of side panels and back panels or only side panels, the heat load is greater, and the temperature rise of the compartment load is difficult to control under high ambient temperature. Especially for refrigerators with no fan shielding in the changing room, when the freezing room is pre-cooled, since the changing room and the freezing room are connected in series, the hot air after defrosting will enter the changing room. In the freezer, because the fan is shielded, the hot air will not enter the freezer. In this way, the load temperature rise of the variable room will be higher than the load temperature rise of the freezer, which leads to a large difference between the heat load of the freezer and the variable room. After defrosting The cooling of the recovery period is obviously asynchronous, the recovery period takes a long time, and the energy consumption increases.

In view of this, it is necessary to provide a new defrosting control method for a three-system refrigerator to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new defrosting control method for a three-system refrigerator, which can overcome the problem of uncontrollable load temperature rise in the variable room due to the lack of shade by the variable room fan, and timely control the load temperature rise of the variable room, So as to promote the synchronization of cooling in the recovery period after defrosting.

In order to achieve the above purpose of the invention, the present invention adopts the following technical solutions: a defrosting control method for a three-system refrigerator, wherein the three-system refrigerator adopts a series-parallel three-cycle structure, and the control method includes the following steps:

After the defrosting process is over, the compressor will be turned on after a delay of T1;

Start the compressor, and judge whether the absolute value of the difference between the temperature t1 of the air outlet sensor in the variable temperature room and the temperature t2 of the sensor in the variable temperature room is less than the preset difference range;

If the judgment result is yes, the solenoid valve is connected to the refrigerating evaporator and the refrigerating capillary tube, and the refrigerating time is T2;

If the judgment result is no, the solenoid valve switches on the refrigerating evaporator and the variable temperature evaporator, and the temperature and freezing are simultaneously cooled for T3 time.

As a further improved technical solution of the present invention, the T2 time includes the pre-cooling time T21. During the time T21, the refrigerating fan is closed; at the critical point of T21, the refrigerating fan is opened, the refrigerating fan is turned on, and the cooling time is T2-T21. .

As a further improved technical solution of the present invention, the T3 time of temperature and freezing and simultaneous cooling includes the T31 time of pre-cooling. During the T31 time, the refrigerating fan is closed; at the critical point of T31, the refrigerating fan is opened, and the refrigerating fan and the variable temperature are closed. The time for cooling T3-T31 when the fan is turned on.

As a further improved technical solution of the present invention, before the start of the defrosting process, it also includes closing the solenoid valve when the refrigerator operation meets the defrosting conditions, and starting the defrosting process after the compressor is stopped for T0 time.

As a further improved technical solution of the present invention, the control method further includes switching the solenoid valve on the freezing evaporator and the refrigerating evaporator after the freezing and refrigerating time T2 or the temperature and freezing simultaneous refrigerating time T3, until the temperature of the refrigerating room drops to a predetermined temperature. The set refrigerating temperature; the solenoid valve switches on the freezing evaporator and the variable temperature evaporator until the temperature of the variable temperature chamber drops to the preset variable temperature temperature; the solenoid valve switches on the freezing evaporator and the freezing capillary until the temperature in the freezing chamber drops to the preset temperature the freezing temperature to exit the defrost recovery process.

In order to achieve the above purpose of the invention, the present invention also provides a defrosting control system for a three-system refrigerator, the single-system refrigerator adopts a series-parallel three-cycle refrigerator structure, and includes a control module, a timing module, a variable temperature damper temperature detection module, and a variable greenhouse temperature. a detection module; the control module is used to time the defrosting process through the timing module to control the compressor to be turned on after a delay of T1 time; after starting the compressor, the control module determines the variable temperature damper temperature detection module and the variable temperature greenhouse temperature detection module Whether the detected temperature difference is within the preset difference range, and control the solenoid valve to connect the refrigerating evaporator and the refrigerating capillary tube according to the judgment result, and refrigerate for T2 time; or according to another judgment result, control the solenoid valve to switch the connection. Through the freezing evaporator and the variable temperature evaporator, the temperature is warmed and frozen at the same time as the cooling T3 time.

As a further improved technical solution of the present invention, the time T2 of the freezing and refrigerating includes the pre-cooling time T21. During the time of T21, the control module controls the shielding of the freezing fan to close, and at the critical point of T21, the control module opens the shielding of the freezing fan and closes it. Turn on the cooling fan.

As a further improved technical solution of the present invention, the T3 time of the refrigeration and variable temperature refrigeration includes the pre-cooling time T31. During the time of T31, the control module controls the refrigerating fan to cover and close, and at the critical point of T31, the control module turns on the refrigerating fan. Shade and turn on the refrigerating fan and variable temperature fan.

As a further improved technical solution of the present invention, the refrigerated evaporator is connected in series with the refrigerated capillary, and the refrigerated capillary is connected in parallel with the refrigerated evaporator and the variable temperature evaporator.

In order to achieve the above object of the invention, the present invention also provides a refrigerator, which includes the aforementioned three-system refrigerator defrosting control system.

The beneficial effects of the present invention are: compared with the prior art, the defrosting control method for a three-system refrigerator provided by the present invention adds a judging step, which is based on the real-time monitoring of the temperature of the variable room air outlet temperature sensor and the variable room temperature sensor. When the temperature difference exceeds the preset difference range, the solenoid valve can be switched to the variable temperature branch, so as to cool the variable room in advance and effectively control the defrosting period. Changing the load temperature of the greenhouse is beneficial to shorten the time-consuming recovery period and reduce the energy consumption of the refrigerator.

Description of drawings

1 is a schematic perspective view of a three-system refrigerator in a preferred embodiment of the present invention;

2 is a block diagram of a defrosting control system of a three-system refrigerator in a preferred embodiment of the present invention;

3 is a flowchart of a defrosting control method for a three-system refrigerator in a preferred embodiment of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present invention.

Terms such as "upper," "over," "lower," "below," and the like, referring to spatially relative positions, are used herein for ease of illustration to describe one element or feature relative to another as shown in the figures The relationship of a unit or feature. The term spatially relative position may be intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatially relative descriptors used herein interpreted accordingly. Also, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are only used to distinguish these described objects from each other.

As shown in FIG. 1 , a preferred refrigerator of the present invention includes three refrigeration compartments, namely a refrigerating compartment, a freezing compartment and a changing room. Among them, the refrigerating chamber is located above the refrigerator, which is independently refrigerated by the refrigerating evaporator (not shown in the figure), the freezing chamber and the changing chamber are arranged below the refrigerator, the freezing chamber is refrigerated by the freezing evaporator, and the changing chamber is refrigerated by the temperature-changing evaporator . Of course, the arrangement of the refrigeration compartments is not limited to the specific manner of this embodiment, and those skilled in the art can make corresponding changes and adjustments according to design requirements.

Referring to the block diagram of the defrosting control system of the three-system refrigerator shown in FIG. 2, the refrigerator includes a compressor, a condenser, a drying filter, a freezing evaporator, and a refrigerating fan matched with the freezing evaporator, which are arranged in series in the main circuit. , refrigerated capillary, solenoid valve, and parallel refrigerated branch and variable temperature parallel branch connected in parallel with the refrigerated capillary. The refrigerating parallel branch includes a refrigerating evaporator, a refrigerating fan matched with the refrigerating evaporator and a refrigerating capillary, and the variable temperature parallel branch includes a variable temperature evaporator, a variable temperature fan matched with the variable temperature evaporator, and a variable temperature capillary. In other words, the refrigerated evaporator is connected in series with the refrigerated capillary, and the refrigerated capillary is connected in parallel with the refrigerated evaporator and the variable temperature evaporator. The refrigerating fan is shielded in the air duct of the freezing chamber. When the refrigerating fan shield is closed, the refrigerating air duct is closed, and the airflow cannot flow into the freezing chamber through the refrigerating air duct. Among them, the solenoid valve is an electronic three-way valve.

As shown in FIG. 3 , an embodiment of the present invention provides a defrosting control method for a three-system refrigerator. The three-system refrigerator adopts a series-parallel three-cycle structure. The defrosting control method includes the following steps:

S0, before the start of the defrosting process, when the operation of the refrigerator meets the defrosting conditions, the solenoid valve is closed, and the defrosting process is started after the compressor is stopped for a time T0. The value range of T0 is 3-7 minutes, and the specific value is determined according to the size of the refrigerator. After the defrosting process is over, the time control is performed first and then the temperature control is performed.

S1, after the defrosting process ends, the compressor is turned on after a delay of T1 time; the value range of T1 is 10-15 minutes, and the specific value is determined according to the size of the refrigerator. The compressor is not started immediately after defrosting, but is restarted after a period of time delay, which can prevent the high-temperature steam in the evaporator from entering the compressor after defrosting and cause burnout; in addition, it is beneficial to slow down the accumulation speed of the frost layer on the surface of the evaporator. (Because there is defrosting water on the surface of the evaporator after defrosting, and the compressor is started directly, it will cause ice on the surface of the evaporator), prolong the defrosting interval, reduce the number of defrosting, and at the same time, prevent the heat generated during the defrosting process. Spread into the box to reduce the impact of the defrosting process on the power consumption of the refrigerator. After that, through time and temperature control, the refrigeration and freezing can be restored to a normal and stable operation state as soon as possible, and the time used for the defrosting recovery period is shortened, thereby reducing the energy consumption of the defrosting recovery period.

S2, start the compressor, collect the temperature t1 of the air outlet sensor of the variable temperature room and the temperature t2 of the sensor of the variable temperature room, and judge whether the absolute value of the difference between the temperature t1 of the air outlet sensor of the variable temperature room and the temperature t2 of the sensor of the variable temperature room is less than the preset difference range ( t3~t4), the preset difference range (t3~t4) is generally 2.5~4℃.

S3, when the absolute value of the difference is less than the preset difference range (t3~t4), that is, when the judgment result is yes, it means that the load temperature rise of the variable temperature compartment is not obvious. At this time, the solenoid valve turns on the refrigeration evaporator and the refrigeration system Capillaries, frozen separately for T2 time. The time T2 includes the pre-cooling time T21. During the time T21, the refrigerating fan is closed; at the critical point of T21, the refrigerating fan is opened, the refrigerating fan is turned on, and the cooling time is T2-T21. During pre-cooling, the refrigerating fan is shielded and closed, which is beneficial to prevent the hot air from defrosting from entering the freezing chamber through the freezing air duct, causing the temperature of the freezing chamber to rise. After the time of pre-cooling T21, the temperature of the air around the refrigerating evaporator drops, and then the refrigerating fan is opened to cover, and the refrigerating fan is started, which is conducive to the further cooling of the refrigerating evaporator.

S4, when the absolute value of the difference exceeds the preset difference range (t3~t4), that is, when the judgment result is no, the solenoid valve switches on the freezing evaporator and the variable temperature evaporator, and the temperature and freezing are simultaneously cooled for T3 time. The absolute value of the difference between the temperature t1 of the air outlet sensor of the variable temperature room and the temperature of the sensor temperature t2 of the variable temperature room exceeds the preset difference range (t3~t4), which means that the temperature of the air outlet of the variable temperature room rises. At this time, the solenoid valve is switched to the variable temperature parallel branch In this way, the variable temperature evaporator starts to cool, which helps to control the load temperature rise of the variable temperature chamber in a timely and effective manner, and prevents the defrost recovery from being out of synchronization due to the excessively fast temperature rise of the variable temperature chamber during the defrost recovery period. Among them, the T3 time of cooling and freezing includes the pre-cooling T31 time. During the T31 time, the refrigerating fan shield is closed; at the critical point of T31, the freezing fan shield is opened, the freezing fan and the variable temperature fan are turned on, and the cooling T3-T31 time. During the pre-cooling process, the shielding of the freezing fan is beneficial to prevent the hot air from defrosting from entering the freezing chamber through the freezing air duct, causing the temperature of the freezing chamber to rise. After the pre-cooling time of T31, the air temperature around the refrigerating evaporator drops. At this time, the refrigerating fan is opened to cover, and then the refrigerating fan and the variable temperature fan are started, which is conducive to the further cooling of the refrigerating evaporator and the variable temperature evaporator.

S5, the control method further includes switching the electromagnetic valve to turn on the refrigerating evaporator and the refrigerating evaporator after the freezing and refrigerating time T2 or the temperature and freezing simultaneous refrigerating time T3 until the temperature of the refrigerating chamber drops to a preset refrigerating temperature. S6, the electromagnetic valve switches on the freezing evaporator and the variable temperature evaporator until the temperature of the variable temperature chamber drops to a preset variable temperature temperature. S7, the electromagnetic valve switches on the freezing evaporator and the freezing capillary until the temperature of the freezing chamber drops to the preset freezing temperature, and the defrosting recovery process is exited.

The order of the above steps S5, S6 and S7 is variable.

In the above, according to the real-time monitoring of the temperature difference between the air outlet temperature sensor of the variable room and the temperature sensor of the variable room and the comparison of the preset difference range, the load temperature rise of the variable room is judged, and the solenoid valve is controlled to select the corresponding refrigeration path. When the temperature difference exceeds the preset difference range (t3~t4), the solenoid valve can be switched to the variable temperature branch, so as to cool the variable room in advance, and effectively control the load temperature rise of the variable room during defrosting. It is beneficial to shorten the time-consuming recovery period and reduce the energy consumption of the refrigerator.

The embodiment of the present invention also provides a defrosting control system for a three-system refrigerator, the single-system refrigerator adopts a series-parallel three-cycle refrigerator structure, and includes a control module, a timing module, a temperature-variable damper temperature detection module, and a temperature-variable greenhouse temperature detection module; The control module is used to control the compressor to be turned on after a delay of T1 time after the defrosting process is completed; after the compressor is started, the control module determines the temperature detected by the variable temperature damper temperature detection module and the variable temperature chamber temperature detection module. Whether the temperature difference is within the preset difference range, and control the solenoid valve to switch on the refrigerating evaporator and the refrigerating capillary tube according to the judgment result, and freeze and refrigerate for T2 time; or according to another judgment result, control the solenoid valve to switch on the refrigerating evaporator And variable temperature evaporator, make temperature and freeze at the same time cooling T3 time.

Preferably, the T2 time of the freezing and refrigeration includes the pre-cooling time T21. During the time T21, the control module controls the shielding of the freezing fan to close, and at the critical point of T21, the control module opens the shielding of the freezing fan and turns on the freezing fan.

Preferably, the time T3 of the cooling and variable-temperature cooling includes the pre-cooling time T31. During the time of T31, the control module controls the shielding of the freezing fan to close, and at the critical point of T31, the control module opens the shielding of the freezing fan and turns on the freezing fan. and variable temperature fan.

Corresponding to the corresponding steps of the control method, before the defrosting process starts, when the refrigerator operation meets the defrosting conditions, the control module closes the solenoid valve, and then starts the defrosting process after the compressor is kept shut down for T0 time. After the defrosting process is over, the control module controls the compressor to turn on after a delay of T1 time.

Further, after the freezing and cooling time T2 or the freezing and variable temperature cooling time T3, the control module controls the solenoid valve to switch on the freezing evaporator and the refrigerating evaporator until the temperature of the refrigerating chamber drops to the preset refrigerating temperature. Next, the control module controls the solenoid valve to switch on the refrigerating evaporator and the variable temperature evaporator until the temperature of the variable temperature chamber drops to a preset variable temperature temperature. Finally, the control module controls the solenoid valve to switch on the freezing evaporator and the freezing capillary until the temperature of the freezing chamber drops to the preset freezing temperature, and the defrosting recovery process is exited.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole, and each The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Changes should all be included within the protection scope of the present invention.

Claims (10)

1. A defrosting control method for a three-system refrigerator adopts a series-parallel three-cycle structure,

the method is characterized in that: the control method comprises the following steps:

after the defrosting process is finished, the compressor is started after the time T1 is delayed;

starting a compressor, and judging whether the absolute value of the difference value between the temperature t1 of the variable-temperature tuyere sensor and the temperature t2 of the variable-temperature compartment sensor is smaller than a preset difference value range;

if the judgment result is yes, the electromagnetic valve is communicated with the freezing evaporator and the freezing capillary tube, and the freezing refrigeration lasts for T2 time;

if the judgment result is negative, the electromagnetic valve is switched on to the freezing evaporator and the variable-temperature evaporator, and the refrigeration is carried out for T3 time while the temperature is changed and the refrigeration is carried out.

2. The defrost control method of the three-system refrigerator of claim 1, wherein: the time T2 includes the time T21 of precooling, and the shielding of the freezing fan is closed in the time T21; at the critical point of T21, the freezing fan is shielded and turned on, and the freezing fan is turned on to refrigerate for T2-T21.

3. The defrost control method of the three-system refrigerator of claim 2, wherein: t3 time for warming and freezing and refrigerating simultaneously comprises pre-cooling T31 time, and in the T31 time, a refrigerating fan is shielded and closed; at the critical point of T31, the freezing fan is shielded and opened, the freezing fan and the variable temperature fan are started, and the refrigeration is carried out for T3-T31.

4. The defrost control method of the three-system refrigerator of claim 1, wherein: before the defrosting process is started, when the refrigerator runs and meets the defrosting condition, the electromagnetic valve is closed, and the defrosting process is started after the compressor is stopped for T0 time.

5. The defrost control method of the three-system refrigerator of claim 1, wherein: the control method further comprises the step that after the freezing refrigeration time T2 or the temperature-changing and freezing simultaneous refrigeration time T3, the electromagnetic valve is switched on the freezing evaporator and the refrigerating evaporator until the temperature of the refrigerating chamber is reduced to the preset refrigerating temperature; the electromagnetic valve is switched on the freezing evaporator and the variable temperature evaporator until the temperature of the variable temperature chamber is reduced to a preset variable temperature; and the electromagnetic valve is switched to connect the freezing evaporator and the freezing capillary tube until the temperature of the freezing chamber is reduced to the preset freezing temperature, and the defrosting recovery process is quitted.

6. The utility model provides a defrost control system of three system refrigerator, three system refrigerator adopts series-parallel three-cycle refrigerator structure which characterized in that: the temperature control device comprises a control module, a timing module, a variable temperature air door temperature detection module and a variable temperature chamber temperature detection module; the control module is used for timing through the timing module after the defrosting process is finished, and controlling the compressor to be started after the time is delayed by T1; after the compressor is started, the control module judges whether the temperature difference detected by the variable temperature air door temperature detection module and the variable temperature chamber temperature detection module is within a preset difference range, controls the electromagnetic valve to be communicated with the freezing evaporator and the freezing capillary tube according to the judgment result, and performs freezing refrigeration for T2 time; or according to another judgment result, controlling the electromagnetic valve to switch on the freezing evaporator and the variable-temperature evaporator, and refrigerating for T3 time at the same time of temperature changing and freezing.

7. The defrost control system of the three-system refrigerator of claim 6, wherein: the time T2 of the freezing refrigeration comprises precooling time T21, the control module controls the shielding of the freezing fan to be closed in the time T21, and the control module opens the shielding of the freezing fan and starts the freezing fan at the critical point of T21.

8. The defrost control system of the three-system refrigerator of claim 6, wherein: the T3 time for the simultaneous cooling of temperature changing and freezing comprises precooling time T31, the control module controls the shielding of the freezing fan to be closed in T31 time, and at the critical point of T31, the control module opens the shielding of the freezing fan and starts the freezing fan and the temperature changing fan.

9. The defrost control system of the three-system refrigerator of claim 6, wherein: the freezing evaporator is connected with the freezing capillary in series, and the freezing capillary is connected with the cold storage evaporator and the variable temperature evaporator in parallel.

10. A refrigerator, characterized in that: a defrost control system for a three system refrigerator comprising a system as claimed in any one of claims 6-9.

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