CN113048716B - Control method and refrigerator - Google Patents

Abstract

The invention provides a refrigerator and a control method, comprising: step S1: comparing the real-time temperature of the freezer compartment of the refrigerator with the temperature at the start-up point of the freezer compartment to determine whether the freezer compartment needs to be refrigerated, and if it is determined that the freezer compartment needs to be refrigerated , then execute step S2; step S2: turn on the compressor of the refrigerator to cool the freezer compartment, record the start time of the compressor; step S3: compare the real-time temperature of the freezer compartment of the refrigerator with the starting point of the freezer compartment temperature, to judge whether the refrigerator needs to be refrigerated, if it is judged that the refrigerator needs to be refrigerated, then perform step S4; step S4: compare the temperature at the starting point of the freezer with the real-time temperature of the evaporator in the freezer difference, and determine whether the difference is smaller than a preset interval; if the difference is smaller than the preset interval, execute step S5; if the difference is greater than the preset interval, execute step S6.

Description

Control method and refrigerator

technical field

The invention relates to the technical field of refrigeration, in particular to a refrigerator and a refrigeration control method thereof.

Background technique

At present, the single-system air-cooled refrigerator is characterized in that a set of refrigeration system is installed in the freezer, mainly including an evaporator and a convection fan, wherein the evaporator provides cooling capacity for the freezer, and the convection fan rotates to force the air in the freezer to flow through Evaporator to improve heat exchange effect. The refrigerating room uses an air duct to directly blow the low-temperature air (usually -18 degrees Celsius) in the freezing room into the refrigerating room, mixes with the air in the refrigerating room, and then flows back into the freezing room through the air return port, thereby reducing the temperature in the refrigerating room. . The refrigeration system of this single-system air-cooled refrigerator has a simple structure, but the -18°C air in the freezer is mixed with the air in the freezer. Due to the large temperature difference between the freezer and the freezer, the temperature in the freezer fluctuates greatly. It is very unfavorable to keep the ingredients in the freezer fresh.

Contents of the invention

Therefore, one object of the present invention is to provide a method for controlling the refrigeration system of a refrigerator, so as to overcome the above-mentioned problem of large temperature fluctuations in the freezer compartment of the single-system air-cooled refrigerator.

The present invention provides a refrigeration control method for a refrigerator, the control method comprising:

Step S1: Compare the real-time temperature of the freezer compartment of the refrigerator with the temperature at the start-up point of the freezer compartment, and determine whether the freezer compartment needs to be refrigerated, and if it is determined that the freezer compartment needs to be refrigerated, perform step S2;

Step S2: Turn on the compressor of the refrigerator to cool the freezer compartment, and record the start time of the compressor;

Step S3: Compare the real-time temperature of the refrigerating chamber of the refrigerator with the temperature at the start-up point of the refrigerating chamber, and determine whether the refrigerating chamber needs to be refrigerated, and if it is judged that the refrigerating chamber needs to be refrigerated, perform step S4;

Step S4: Comparing the difference between the starting point temperature of the freezing chamber and the real-time temperature of the freezing chamber evaporator, and judging whether the difference is smaller than a preset interval; if the difference is smaller than the preset interval, execute Step S5; if the difference is greater than the preset interval, execute step S6;

Wherein, the step S5 is to open the damper of the refrigerating room to cool the refrigerating room; the step S6 is not to refrigerate the refrigerating room.

As an optional technical solution, the temperature range of the preset interval is 0°C-5°C.

As an optional technical solution, if it is judged in step S3 that the refrigerating chamber does not need to be refrigerated, close the damper of the refrigerating chamber, and perform step S11 at the same time, wherein, the step S11 is to continue to judge whether the refrigerating chamber needs to be refrigerated; If it is determined that the freezing chamber needs to be refrigerated, then return to step S2; if it is determined that the freezing chamber does not need to be refrigerated, then step S31 is executed.

As an optional technical solution, the step S31 is to continue to judge whether the refrigerator needs to be refrigerated; if it is judged that the refrigerator needs to be refrigerated, then return to the step S4; , then execute the step S7.

As an optional technical solution, the step S7 includes controlling the shutdown of the compressor and the freezer fan, recording the shutdown time of the compressor, and calculating the running time between the shutdown time and the startup time.

As an optional technical solution, step S8 is also included. In the step S8, it is judged whether the running time is less than the preset time range, and if the running time is less than the preset time range, the step S9 is executed; if If the running time is not less than the preset time range, step S10 is executed.

As an optional technical solution, the step S9 is: reduce the operating frequency of the compressor in the next refrigeration cycle; continue to judge whether the operating time is greater than the preset time, if the operating time is greater than the After a preset time, step S11 is executed; the step S11 is to increase the operating frequency of the compressor in the next refrigeration cycle.

As an optional technical solution, the running time is a minimum value less than the preset time range; and, the running time is a maximum value greater than the preset time range.

As an optional technical solution, the preset time range is 80min-300min.

Another object of the present invention is to provide a refrigerator, including a refrigeration system, the refrigeration system is used to perform refrigeration for the refrigerator compartment and the freezer compartment of the refrigerator, and the refrigeration system performs refrigeration for the refrigeration compartment according to the above-mentioned control method. Compartment and freezer cooling.

Compared with the prior art, in the control method provided by the present invention, before cooling the refrigerator, the difference between the real-time temperature of the freezer evaporator in the refrigeration system and the temperature at the start-up point of the freezer is monitored. When the temperature in the freezer is within the preset temperature range, the refrigerating chamber is refrigerated, that is, the cooling priority of the freezer is higher than that of the refrigerating chamber, so as to keep the temperature fluctuation of the freezing chamber small, so that the freshness of the food in the freezing chamber is better.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is the functional block diagram of the refrigerator of the present invention;

Fig. 2 is a functional block diagram of the refrigeration system of the refrigerator of the present invention;

Fig. 3 is a flow chart of the control method of the refrigeration system of the refrigerator according to the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Fig. 1 is a functional block diagram of the refrigerator of the present invention; Fig. 2 is a functional block diagram of the refrigeration system of the refrigerator of the present invention.

As shown in Figures 1 and 2, the present invention provides an air-cooled refrigerator with a single evaporator, which includes a freezer compartment 1, a freezer compartment 2 and a refrigeration system disposed inside the refrigerator. 2 in the freezer evaporator 3 that provides cooling.

Wherein, the first temperature sensor 4 is set in the freezer 1 to obtain the real-time temperature of the freezer; the second temperature sensor 5 is set in the freezer 2 to obtain the real-time temperature of the freezer; Three temperature sensors 6 are used to obtain the real-time temperature of the evaporator 3 in the freezing chamber.

In the present application, corresponding to the freezer 1, there are a temperature at the startup point of the freezer and a temperature at the shutdown point of the freezer, and comparing the temperature at the start-up point of the freezer with the real-time temperature in the freezer 1 to determine whether it is necessary to refrigerate the freezer 1, wherein, if When the real-time temperature in the freezer 1 is greater than the start-up point temperature of the freezer, the freezer 1 needs to be refrigerated, the compressor 8 is started, and the freezer evaporator 3 and the freezer fan are turned on; if the real-time temperature in the freezer 1 is less than When the temperature at the start-up point of the freezer compartment does not need to refrigerate the freezer compartment 1; if the real-time temperature in the freezer compartment 1 is lower than the shutdown point temperature of the freezer compartment, the freezer evaporator 3 and the freezer fan can be controlled to stop. The temperature at the shutdown point of the freezing chamber is lower than the temperature at the startup point of the freezing chamber, and the temperature at the shutdown point of the freezing chamber and the temperature at the startup point of the freezing chamber are respectively fixed values and can be set in advance. For example, the shutdown temperature of the freezer is -19°C, and the start-up temperature of the freezer is -18°C.

The shutdown point temperature of the freezing chamber and the startup point temperature of the freezing chamber can be used to avoid frequent startup and/or shutdown of the refrigeration system of the refrigerator.

Similarly, corresponding to the refrigerating room 2, there are a start-up point temperature of the refrigerating room and a shutdown point temperature of the refrigerating room, comparing the starting point temperature of the refrigerating room with the real-time temperature in the refrigerating room 2 to determine whether the refrigerating room 2 needs to be refrigerated, wherein, if When the real-time temperature in the refrigerating room 2 is greater than the temperature at the start-up point of the refrigerating room, it is necessary to cool the refrigerating room 2 and turn on the fan in the refrigerating room; The refrigerating room 2 is refrigerated; if the real-time temperature of the refrigerating room is lower than the shutdown point temperature of the refrigerating room, the refrigerating room evaporator 4 and the fan of the refrigerating room can be controlled to stop. The temperature at the shutdown point of the refrigerating chamber is lower than the temperature at the startup point of the refrigerating chamber, and the temperature at the shutdown point of the refrigerating chamber and the temperature at the startup point of the refrigerating chamber are respectively certain values. For example, the shutdown point temperature of the refrigerating chamber is -1°C, and the startup point temperature of the freezer chamber is 0°C.

The working process of the refrigeration system includes that the compressor 8 is turned on, and the low-temperature and low-pressure refrigerant is sucked by the compressor 8, and is compressed into a high-temperature and high-temperature superheated gas in the cylinder of the compressor 8, and then discharged into the condenser 9; The high-temperature superheated gas dissipates heat through the condenser 9, the temperature drops, and is gradually cooled to normal temperature, high-pressure saturated steam, and further cooled to a saturated liquid; the condensed refrigeration and saturated liquid are throttled by the capillary 10, and become normal temperature, Low-pressure wet steam; then absorb heat in the evaporator 3 of the freezer for vaporization, lower the temperature of the evaporator 3 and its surroundings, and make the refrigerant a low-temperature, low-pressure gas. The refrigerant coming out from the freezer evaporator 3 returns to the compressor 8 again, repeats the above process, and transfers the heat in the refrigerator to the air outside the refrigerator to achieve the purpose of refrigeration.

In addition, the refrigerator provided by the present invention also includes a refrigerator computer control board 7, which can obtain the real-time temperatures detected by the first temperature sensor 4, the second temperature sensor 5 and the third temperature sensor 6; and by judging and comparing different real-time temperatures, control Refrigeration systems perform different steps.

Further, the refrigerator computer control board 7 can also control the compressor 8, the freezer evaporator 3, the opening and closing of the freezer fan and the refrigerating room fan, and the operating frequency.

Fig. 3 is a flow chart of the control method of the refrigeration system of the refrigerator according to the present invention.

As shown in Figure 3, the control method 100 includes:

Step S1: Compare the real-time temperature of the freezer compartment of the refrigerator with the temperature at the start-up point of the freezer compartment, and determine whether the freezer compartment needs to be refrigerated, and if it is determined that the freezer compartment needs to be refrigerated, perform step S2;

Step S2: Turn on the compressor of the refrigerator to cool the freezer compartment, and record the start time of the compressor;

Step S3: Compare the real-time temperature of the refrigerating chamber of the refrigerator with the temperature at the start-up point of the refrigerating chamber, and determine whether the refrigerating chamber needs to be refrigerated, and if it is judged that the refrigerating chamber needs to be refrigerated, perform step S4;

Step S4: Comparing the difference between the starting point temperature of the freezing chamber and the real-time temperature of the freezing chamber evaporator, and judging whether the difference is smaller than a preset interval; if the difference is smaller than the preset interval, execute Step S5; if the difference is greater than the preset interval, execute step S6;

Wherein, the step S5 is to cool the refrigerating room; the step S6 is not to refrigerate the refrigerating room.

In a preferred embodiment, in step S1, the refrigerator computer control board 7 acquires the real-time temperature in the freezing chamber 1 detected by the first temperature sensor 4, compares the real-time temperature in the freezing chamber 1 with the temperature at the start-up point of the freezing chamber, The temperature at the start-up point of the freezer is, for example, -18°C. If the real-time temperature in the freezer compartment 1 is less than the start-up point temperature of the freezer compartment, and the real-time temperature in the freezer compartment 1 is also lower than the shutdown point temperature of the freezer compartment, it means that the temperature in the freezer compartment 1 is lower, and step S20 is performed; if the freezer compartment 1 The real-time temperature in the freezer is higher than the start-up temperature of the freezer, and the temperature in the freezer 1 is too high, and the freezer 1 needs to be refrigerated.

In addition, the step S20 is to control the compressor 8 and the freezer fan to stop.

In addition, if it is judged that the real-time temperature in the freezer compartment 1 is less than the start-up point temperature of the freezer compartment and less than the shutdown point temperature of the freezer compartment, the computer control panel 7 of the refrigerator controls the compressor 8 to maintain operation until the real-time temperature in the freezer compartment 1 is lower than the shutdown point temperature of the freezer compartment. Point temperature, back control compressor 8 shutdowns.

In a preferred embodiment, in step S2, the computer control board 7 of the refrigerator outputs a control signal so that the compressor 8 is turned on, and the refrigerant circulates through the refrigeration system, and the cold generated by the evaporator 3 in the freezer is passed through the fan in the freezer ( not shown) are provided in the freezer compartment 1. Simultaneously, refrigerator computer control panel 7 records the opening time of compressor 8.

In a preferred embodiment, in step S3, the refrigerator computer control board 7 acquires the real-time temperature in the refrigerating room 2 detected by the second temperature sensor 5, and compares the real-time temperature in the refrigerating room 2 with the starting point temperature of the refrigerating room, The temperature at the start-up point of the refrigerating chamber is, for example, about 0°C. If the real-time temperature in refrigerating room 2 is lower than the start-up temperature of the refrigerating room, it is not necessary to refrigerate the refrigerating room 2, and the door of the refrigerating room is closed; High, need to cool the refrigerator compartment 2.

In a preferred embodiment, in step S4, the computer control board 7 of the refrigerator acquires the real-time temperature of the freezing chamber evaporator 3 detected by the third temperature sensor 6, calculates the real-time temperature of the freezing chamber evaporator 3 and the relationship between the freezing chamber starting difference between the point temperatures, and compare whether the difference is smaller than a preset interval. Wherein, the temperature range of the preset interval is 0°C-5°C. In a preferred embodiment, the difference may fall between 0°C and 5°C, and in extreme cases cannot exceed 5°C.

When the difference exceeds the preset interval, it means that the temperature in the freezer compartment 1 is relatively high, and step S6 is executed to close the damper of the freezer compartment, and the freezer compartment 2 is not refrigerated. At this time, the computer control board 7 of the refrigerator controls the refrigeration system to provide cooling capacity for the freezer 1 first, so that the real-time temperature of the freezer evaporator 3 is close to the temperature at the start-up point of the freezer, so as to avoid temperature fluctuations in the freezer 1 and improve its freshness preservation effect. . That is, under the premise of appropriately sacrificing the refrigeration effect of the refrigerator compartment 2, the freezing effect in the freezer compartment 1 is ensured, and the real-time temperature rise of the freezer evaporator 3 due to cooling of the refrigerator compartment 2 is avoided, and the temperature fluctuation in the freezer compartment 1 is large. question.

When the difference is less than or falls within the preset range, it means that the real-time temperature of the evaporator 3 in the freezing chamber is low, and step S5 can be executed. Refrigerator computer control panel 7 controls the refrigerating chamber air door in refrigerating chamber 2 to open, so that freezing chamber evaporator 3 provides cooling capacity and can be sent into refrigerating chamber 2 from air duct and refrigerating chamber damper through air duct, and it is refrigerated. At this time, since the real-time temperature of the evaporator 3 in the freezing chamber is relatively low, even if the refrigeration chamber 2 is refrigerated, the temperature in the freezing chamber 1 will not be significantly affected, thereby avoiding temperature fluctuations in the freezing chamber 1 .

The purpose of the above step S4 is to redistribute the cooling capacity in the refrigeration system to avoid the problem that the real-time temperature fluctuation in the freezing compartment 1 is too large, resulting in poor preservation effect of the freezing compartment 1 .

In a preferred embodiment, if it is determined in step S3 that the refrigerator compartment 2 does not need to be refrigerated, the refrigerator computer control board 7 closes the refrigerator compartment damper of the refrigerator compartment 2, and simultaneously executes step S11, wherein the step S11 is that the refrigerator computer The control board 7 continues to judge whether to need to refrigerate the freezer 1 (judgment process is similar to step S1); by comparing the real-time temperature in the freezer 1 with the temperature at the starting point of the freezer, it is judged that the freezer 1 needs to be refrigerated and then returns to step S2; Or, if it is determined that the freezing compartment 1 does not need to be refrigerated, then step S31 is executed.

Wherein, the step S31 is that the computer control board 7 of the refrigerator continues to judge whether the refrigerator needs to be refrigerated (the judging process is similar to step S3); If the refrigerating room 2 is refrigerated, then return to the step S4; or, if it is judged that the refrigerating room 2 does not need to be refrigerated, then execute the step S7.

In a preferred embodiment, step S7 includes, the refrigerator computer control panel 7 controls the compressor 8 and the freezer fan in the refrigeration system to stop, and records the shutdown time of the compressor 8; stores the shutdown time in the storage unit, and calculates The running time between said off time and said on time (in step S2).

In a preferred embodiment, after step S7, enter step S8, the refrigerator computer control board 7 compares the running time with the preset time range, and if it judges that the running time is less than the preset time range, then execute the step S9: If the running time is not less than the preset time range, execute step S10. Wherein, the step S9 is: in the next refrigeration cycle, the refrigerator computer control board 7 reduces the operating frequency of the compressor 8; the step S10 is, continue to judge whether the operating time is greater than the preset time range, if If the running time is greater than the preset time range, then step S11 is executed; the step S11 is, in the next cooling cycle, the computer control board 7 of the refrigerator increases the running frequency of the compressor 8 .

In a preferred embodiment, the running time is less than the minimum value of the preset time range; or, the running time is greater than the maximum value of the preset time range. The preset time range is 80min-300min.

The operating frequency of the compressor 8 involves 30Hz, 36Hz, 42Hz, 50Hz, 56Hz, 60Hz, 66Hz, 72Hz and so on.

In step S9 and step S11, the operating frequency of the compressor 11 is decreased or increased, for example, the operating frequency of the last cycle is 36 Hz, when it needs to be increased, it is adjusted to 42 Hz; when it needs to be adjusted down, it is adjusted to 30 Hz.

In the present invention, from step S2 to step S7, the operation of the compressor 8 is counted as one operation cycle, wherein, in step S7, the real-time temperature in the freezing chamber 1 has been adapted to the temperature at the start-up point of the freezing chamber. The cooling time of the fan in the freezer compartment is used to overcome the problem of excessive temperature changes in the freezer compartment 1 .

To put it simply, if the cooling time is too long or too short, it is not conducive to the stability of the real-time temperature in the freezing chamber 1 . If the working time of compressor 8 is too short, such as less than 80 minutes, it means that the operating frequency (or rotating speed) of compressor 8 is too fast, and the freezing room fan can make the temperature in freezing room 1 drop rapidly in a short time; Long, for example, less than 300min, indicating that the operating frequency (or rotation speed) of the compressor 8 is too low, resulting in slow cooling of the freezer evaporator 3, and the freezer fan needs a long time to slowly drop the temperature in the freezer 1. That is, if the temperature in the freezer compartment 1 drops too fast or too slow, there will be a problem that the range of real-time temperature fluctuations will be large.

It has been verified by experiments that the real-time temperature fluctuation of the freezing chamber 1 is small and the cooling time of the freezing chamber 1 is long so that the freezing chamber 1 can obtain the best fresh-keeping effect.

In steps S4 and S6 in FIG. 3 , DFS represents the real-time temperature of the freezing evaporator; F-on represents the temperature at the start-up point of the freezing chamber. DFS-F-on represents the difference between the real-time temperature of the freezer evaporator and the temperature at the start-up point of the freezer.

The present invention also provides a refrigerator (not shown), the refrigerating system is used to refrigerate the refrigerating chamber and the freezing chamber of the refrigerator, and the refrigerating system refrigerates the refrigerating chamber and the freezing chamber according to the above-mentioned control method 100 Freezer cooling.

To sum up, in the control method provided by the present invention, before cooling the refrigerating chamber, the difference between the real-time temperature of the evaporator in the refrigeration system and the real-time temperature of the freezing chamber is monitored, and when the difference falls within the preset temperature range , the refrigerating chamber is refrigerated, that is, the priority of controlling the cooling of the refrigerating chamber is higher than that of the refrigerating chamber, so as to keep the temperature fluctuation of the freezing chamber small, so that the food preservation effect of the freezing chamber is better.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes All changes and modifications should belong to the scope of protection of the appended claims of the present invention.

Claims (6)

1. A control method for refrigerator refrigeration, characterized in that: the control method comprises: Step S1: Compare the real-time temperature of the freezer compartment of the refrigerator with the temperature at the start-up point of the freezer compartment, and determine whether the freezer compartment needs to be refrigerated, and if it is determined that the freezer compartment needs to be refrigerated, perform step S2; Step S2: Turn on the compressor of the refrigerator to cool the freezer compartment, and record the start time of the compressor; Step S3: Compare the real-time temperature of the refrigerating chamber of the refrigerator with the temperature at the start-up point of the refrigerating chamber, and determine whether the refrigerating chamber needs to be refrigerated, and if it is judged that the refrigerating chamber needs to be refrigerated, perform step S4; Step S4: Compare the difference between the real-time temperature of the freezer evaporator and the temperature at the start-up point of the freezer, and determine whether the difference is smaller than a preset interval; if the difference is smaller than the preset interval, execute Step S5; if the difference is greater than the preset interval, execute step S6; Wherein, the step S5 is to open the damper of the refrigerating room to cool the refrigerating room; the step S6 is not to refrigerate the refrigerating room, In step S3, if it is judged that it is not necessary to refrigerate the refrigerating chamber, close the air door of the refrigerating chamber, and perform step S11 at the same time, wherein, the step S11 is to continue judging whether the refrigerating chamber needs to be refrigerated; Compartment cooling returns to step S2; if it is determined that the freezing compartment is not required to be refrigerated, then step S31 is performed, and the step S31 is to continue to determine whether the refrigeration compartment needs to be refrigerated; if it is determined that the refrigerating compartment needs to be refrigerated, Then return to the step S4; if it is judged that the refrigerating chamber does not need to be refrigerated, then execute the step S7, the step S7 includes controlling the shutdown of the compressor and the freezer fan, recording the shutdown time of the compressor, and calculating the The running time between the off time and the on time. 2. The control method according to claim 1, characterized in that, the temperature range of the preset interval is 0°C-5°C. 3. The control method according to claim 1, further comprising step S8, in which it is judged whether the running time is less than a preset time range in the step S8, if the running time is less than the preset time range , then execute step S9; if the running time is not less than the preset time range, then execute step S10, the step S9 is: reduce the operating frequency of the compressor in the next refrigeration cycle; the step S10 To continue to judge whether the running time is greater than the preset time range, if the running time is greater than the preset time range, then perform step S11; the step S11 is to compress the The operating frequency of the machine is increased. 4. The control method according to claim 3, wherein the running time is a minimum value less than the preset time range; and the running time is a maximum value greater than the preset time range. 5. The control method according to claim 3, characterized in that, the preset time range is 80min-300min. 6. A refrigerator, comprising a refrigerating system, the refrigerating system is used to refrigerate the refrigerating chamber and the freezing chamber of the refrigerator, characterized in that: The refrigeration system refrigerates the refrigerator compartment and the freezer compartment according to the control method according to any one of claims 1-5.

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