Refrigerator and control method thereof

Abstract

The invention discloses a refrigerator and a control method thereof.The refrigerator comprises a freezing chamber, a refrigerating chamber, a variable-temperature chamber and a refrigerating system, and the refrigerating system is a double-circulation refrigerating system and comprises a compressor, a condenser, a throttling device and a chamber evaporator which are sequentially connected; the compartment evaporator comprises a freezing evaporator, a refrigerating evaporator and a variable-temperature evaporator, the refrigerating evaporator and the variable-temperature evaporator are connected in parallel and then connected with the freezing evaporator in series, and the compressor, the condenser, the throttling device, the refrigerating evaporator and the freezing evaporator form a first circulating refrigerating system; and the compressor, the condenser, the throttling device, the variable-temperature evaporator and the freezing evaporator form a second circulating refrigerating system. The problem that in the prior art, the temperature of the freezing chamber of an independent three-cycle refrigerating system refrigerator is unstable is solved, the temperature stability of the freezing chamber is improved, and the refrigerating effect of the refrigerator is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator and a control method thereof. Background Art

[0002] With the advancement of technology and the improvement of quality of life, people's demand for home appliances is no longer limited to basic functions, but they pursue more efficient, energy-saving and intelligent use experience. As one of the indispensable home appliances in modern families, the development of refrigerator refrigeration technology and circulation system is particularly critical.

[0003] Most traditional refrigerators use a single-cycle refrigeration system. The single-cycle system has a simple structure and is inexpensive, but the freezing and refrigeration cannot be independently controlled, resulting in large temperature fluctuations and poor food preservation. In order to solve these problems, independent three-cycle refrigerator technology came into being. The technical advantages of independent three-cycle refrigerators are not only reflected in the accuracy of temperature control and the effect of food preservation, but also in energy saving and consumption reduction. Since each temperature zone is independently refrigerated, it can be individually controlled according to actual needs, avoiding unnecessary energy waste.

[0004] However, the existing independent three-circulation system refrigerators on the market are often realized by connecting three flow paths in parallel: refrigeration in series with freezing, variable temperature in series with freezing, and freezing. The three flow paths cool alternately, and only one flow path can flow at a time. When refrigeration or variable temperature refrigeration is in series, refrigeration or freezing occupies cold capacity, causing the temperature of the freezing evaporator to rise, the temperature of the freezer compartment to rise rapidly, and the temperature of the freezer compartment to be unstable.

[0005] With regard to the problem of unstable temperature in the freezer compartment of an independent three-circulation refrigeration system refrigerator in the related art, no effective solution has been proposed yet. Summary of the invention

[0006] The present invention provides a refrigerator and a control method thereof, so as to at least solve the problem of unstable temperature of a freezing chamber of an independent three-circulation refrigeration system refrigerator in the prior art.

[0007] To solve the above technical problems, according to one aspect of an embodiment of the present invention, a refrigerator is provided, comprising: a freezer compartment, a refrigerator compartment, a variable temperature chamber and a refrigeration system, wherein the refrigeration system is a dual-cycle refrigeration system, comprising: a compressor, a condenser, a throttling device and a compartment evaporator connected in sequence; the compartment evaporator comprises: a freezing evaporator, a refrigerating evaporator and a variable temperature evaporator, the refrigerating evaporator and the variable temperature evaporator are connected in parallel and then connected in series with the freezing evaporator, the compressor, the condenser, the throttling device, the refrigerating evaporator and the freezing evaporator constitute a first cycle refrigeration system, and the compressor, the condenser, the throttling device, the variable temperature evaporator and the freezing evaporator constitute a second cycle refrigeration system.

[0008] Furthermore, the refrigeration system also includes: a condensing fan, located at the condenser; a freezing fan, located at the freezing evaporator; a refrigerating fan, located at the refrigerating evaporator; and a variable temperature fan, located at the variable temperature evaporator; wherein, when the freezing compartment has a refrigeration demand and the refrigerating compartment and the variable temperature compartment have no refrigeration demand, the freezing fan is turned on, the refrigerating fan and the variable temperature fan are turned off, and the compressor runs at a low speed.

[0009] Furthermore, it also includes: a refrigeration defrost sensor, located on the refrigeration evaporator, for detecting the temperature of the refrigeration evaporator; a refrigeration defrost sensor, located on the refrigeration evaporator, for detecting the temperature of the refrigeration evaporator; a variable temperature defrost sensor, located on the variable temperature evaporator, for detecting the temperature of the variable temperature evaporator; wherein, after the freezing chamber, the refrigeration chamber and the variable temperature chamber all reach the required temperature, the freezing fan, the refrigeration fan and the variable temperature fan are turned off, and when the temperature of the refrigeration evaporator is less than or equal to a first preset temperature, the temperature of the refrigeration evaporator and the temperature of the variable temperature evaporator are less than or equal to a second preset temperature, the compressor is controlled to stop; wherein, the first preset temperature is lower than the second preset temperature.

[0010] According to another aspect of an embodiment of the present invention, a refrigerator control method is provided, which is applied to the refrigerator as described above, and the method comprises: detecting whether a refrigerating compartment and a variable temperature compartment have a refrigeration demand; if the refrigerating compartment or the variable temperature compartment has a refrigeration demand, controlling the refrigerating fan or the variable temperature fan to turn on, and controlling the compressor to start and run; otherwise, further detecting whether a freezing compartment has a refrigeration demand, when the freezing compartment has a refrigeration demand, controlling the freezing fan to turn on, the refrigerating fan and the variable temperature fan to turn off, and controlling the compressor to run at a low speed.

[0011] Furthermore, after the compressor is started and operated, the method further includes: detecting the ambient temperature of the refrigerator; determining whether the compressor needs to adjust the speed gear according to the ambient temperature; when the compressor needs to adjust the speed gear, obtaining the set temperature gear of the refrigeration compartment or the variable temperature compartment, and determining the speed gear of the compressor according to the set temperature gear; when the compressor does not need to adjust the speed gear, controlling the speed of the compressor to remain unchanged.

[0012] Further, determining the speed gear of the compressor according to the set temperature gear includes: obtaining a correspondence table between the set temperature gear of the refrigerated compartment and the speed gear of the compressor at different ambient temperatures, and a correspondence table between the set temperature gear of the variable temperature compartment and the speed gear of the compressor at different ambient temperatures; determining the speed gear of the compressor in the corresponding correspondence table according to the set temperature gear of the refrigerated compartment or the variable temperature compartment.

[0013] Furthermore, it also includes: sequentially detecting whether the refrigerating chamber, the temperature varying temperature and the freezing chamber have reached the compressor stop point; after the refrigerating chamber, the temperature varying temperature and the freezing chamber have reached the compressor stop point, further acquiring the temperature of the refrigerating evaporator, the temperature of the variable temperature evaporator and the temperature of the freezing evaporator, and controlling the operation of the compressor according to the temperature of the refrigerating evaporator, the temperature of the variable temperature evaporator and the temperature of the freezing evaporator; when the refrigerating chamber or the temperature varying temperature or the freezing chamber has not reached the compressor stop point, controlling the compressor to maintain the current operating state.

[0014] Furthermore, the operation of the compressor is controlled according to the temperature of the refrigerated evaporator, the temperature of the variable temperature evaporator and the temperature of the frozen evaporator, including: sequentially determining whether the temperature of the refrigerated evaporator is less than or equal to a second preset temperature, whether the temperature of the variable temperature evaporator is less than or equal to the second preset temperature, and whether the temperature of the frozen evaporator is less than or equal to a first preset temperature; if so, controlling the compressor to stop; otherwise, controlling the compressor to maintain the current operating state.

[0015] Furthermore, the control of starting the compressor includes: detecting whether the refrigerator is in the defrosting and defrosting recovery period; if so, detecting whether the refrigerator is in the strong cooling mode or the pre-cooling mode, and when the refrigerator is in the strong cooling mode, controlling the compressor to start and run according to a preset strong cooling speed, and when the refrigerator is in the pre-cooling mode, controlling the compressor to start and run according to a preset pre-cooling speed; otherwise, further detecting whether the compressor is in a shutdown protection stage, and when the compressor is in the shutdown protection stage, delaying the start of the compressor, and when the compressor is not in the shutdown protection stage, controlling the compressor to start and run according to the set reference speed.

[0016] According to another aspect of an embodiment of the present invention, there is provided a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute the refrigerator control method as described above when executed by a computer processor.

[0017] In the present invention, a refrigerator with a double-circulation refrigeration system is provided, which has three compartments: a freezing chamber, a cold storage chamber and a variable temperature chamber, and is provided with a freezing evaporator, a cold storage evaporator and a variable temperature evaporator correspondingly, and the cold storage evaporator and the variable temperature evaporator are connected in parallel and then connected in series with the freezing evaporator, wherein the compressor, the condenser, the throttling device, the cold storage evaporator and the freezing evaporator constitute a first circulation refrigeration system, and the compressor, the condenser, the throttling device, the variable temperature evaporator and the freezing evaporator constitute a second circulation refrigeration system. The series-parallel double-circulation refrigeration system achieves an independent three-circulation effect, and maintains the cold storage or variable temperature evaporator at a lower temperature during freezing refrigeration, thereby causing excessive fluctuations in the freezing temperature during freezing or variable temperature refrigeration, avoiding the problem of rapid recovery of the freezing chamber temperature and unstable freezing chamber temperature caused by the existing three-circulation system refrigerators on the market during cold storage and variable temperature refrigeration, and improving the temperature stability of the freezing chamber. In addition, a lower initial cold storage evaporation temperature or variable temperature evaporation temperature can improve the rapid cooling capacity of the refrigerator and effectively improve the refrigeration effect of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an optional structural schematic diagram of a refrigeration system of a refrigerator according to an embodiment of the present invention;

[0019] Figure 2 is an optional flow chart of a refrigerator control method according to an embodiment of the present invention;

[0020] Figure 3 is another optional flow chart of the refrigerator control method according to an embodiment of the present invention;

[0021] Figure 4 is an optional flow chart of a compressor shutdown control method according to an embodiment of the present invention;

[0022] Figure 5 It is an optional flow chart of a compressor startup control method according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Compressor; 2. Evaporator; 3. Microchannel condenser; 4. Back cooling; 5. Freezer door protection; 6. Refrigerated variable temperature door protection; 7. Filter; 8. Solenoid valve; 9. First capillary; 10. Second capillary; 11. Variable temperature evaporator; 12. Refrigerated evaporator; 13. Freezing evaporator; 14. Condensing fan; 15. Variable temperature fan; 16. Refrigerated fan; 17. Refrigeration fan. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0027] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] It should be understood that although the terms first, second, third, etc. may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0029] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0030] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0031] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] Example 1

[0033] In a preferred embodiment 1 of the present invention, a refrigerator is provided, including a freezing chamber, a refrigerating chamber, a temperature-changing chamber and a refrigeration system. The refrigeration system is a double-circulation refrigeration system. Specifically, Figure 1 An optional structural schematic diagram of the refrigeration system of the refrigerator is shown, such as Figure 1 As shown, the refrigerator refrigeration system includes:

[0034] Compressor 1, condenser, throttling device and compartment evaporator connected in sequence;

[0035] The compartment evaporator comprises: a freezing evaporator 13, a refrigerating evaporator 12 and a temperature-variable evaporator 11. The refrigerating evaporator 12 and the temperature-variable evaporator 11 are connected in parallel and then connected in series with the freezing evaporator 13. The compressor 1, the condenser, the throttling device, the refrigerating evaporator 12 and the freezing evaporator 13 constitute a first circulation refrigeration system, and the compressor 1, the condenser, the throttling device, the temperature-variable evaporator 11 and the freezing evaporator 13 constitute a second circulation refrigeration system.

[0036] In the above embodiment, a refrigerator with a dual-circulation refrigeration system is provided, which has three compartments: a freezing chamber, a cold storage chamber and a variable temperature chamber, and correspondingly provided with a freezing evaporator, a cold storage evaporator and a variable temperature evaporator, wherein the cold storage evaporator and the variable temperature evaporator are connected in parallel and then connected in series with the freezing evaporator, wherein the compressor, the condenser, the throttling device, the cold storage evaporator and the freezing evaporator constitute a first circulation refrigeration system, and the compressor, the condenser, the throttling device, the variable temperature evaporator and the freezing evaporator constitute a second circulation refrigeration system. The series-parallel dual-circulation refrigeration system achieves an independent three-circulation effect, and maintains the cold storage or variable temperature evaporator at a lower temperature during freezing refrigeration, thereby causing excessive fluctuations in the freezing temperature during freezing or variable temperature refrigeration, avoiding the problem of rapid recovery of the freezing chamber temperature and unstable freezing chamber temperature during freezing and variable temperature refrigeration in the existing three-circulation system refrigerators on the market, and improving the temperature stability of the freezing chamber. In addition, a lower initial cold storage evaporation temperature or variable temperature evaporation temperature can improve the rapid cooling capacity of the refrigerator and effectively improve the refrigeration effect of the refrigerator.

[0037] like Figure 1As shown, there are three evaporators in the refrigeration cycle, namely, the freezing evaporator 13, the variable temperature evaporator 11, and the refrigeration evaporator 12, wherein the variable temperature evaporator 11 and the freezing evaporator 13 are connected in series to form a flow path I, and the refrigeration evaporator 12 and the freezing evaporator 13 are connected in series to form a flow path II, and the flow path I and flow path II are connected in parallel and cannot be connected at the same time. The refrigerant flows out from the exhaust side of the compressor 1, and the high-temperature and high-pressure gas enters the evaporation plate 2, and dissipates heat by evaporating the defrosting water in the evaporation plate 2, and then flows into the microchannel condenser 3, and dissipates heat by forced convection through the condensing fan 14. At this time, most of the refrigerant changes from gas to liquid, and then passes through the back cooling 4, the freezing door protection 5, and the refrigeration variable temperature door protection 6 successively, forming a high-temperature and high-pressure liquid with a certain degree of supercooling, and then passes through the filter 7, and the electromagnetic valve 8 receives the signal sent by the main board to conduct the flow path I / flow path II, and the refrigerant changes into a low-temperature and low-pressure gas in the flow path I / flow path II and flows back to the compressor 1.

[0038] Corresponding to the condenser and the evaporator, the refrigeration system also includes: a condensing fan 14, located at the condenser; a freezing fan 17, located at the freezing evaporator 13; a refrigerating fan 16, located at the refrigerating evaporator 12; a variable temperature fan 15, located at the variable temperature evaporator 11; wherein, when there is a refrigeration demand in the freezing chamber and there is no refrigeration demand in the refrigerating chamber and the variable temperature chamber, the freezing fan 17 is turned on, the refrigerating fan 16 and the variable temperature fan 15 are turned off, and the compressor 1 runs at a low speed. When there is no refrigeration request in the cold storage room and the temperature-variable temperature room, the compressor 1 continues to cool the cold storage or temperature-variable temperature evaporator 11 at a low speed, but the cold storage fan 16 and the temperature-variable temperature fan 15 do not rotate, so that the cold storage and temperature-variable temperature evaporator 11 quickly reach a lower temperature. When the solenoid valve 8 switches to the cold storage evaporator 12 and the temperature-variable temperature evaporator 11, since the cold storage evaporator 12 and the temperature-variable temperature evaporator 11 have obtained a lot of cooling capacity, the temperature fluctuation of the freezing evaporator 13 is not large, the temperature of the freezing evaporator 13 recovers slowly, and the temperature fluctuation of the freezing room is small.

[0039] In addition, it also includes: a freezing defrost sensor, located on the freezing evaporator 13, for detecting the temperature of the freezing evaporator 13; a refrigeration defrost sensor, located on the refrigeration evaporator 12, for detecting the temperature of the refrigeration evaporator 12; a variable temperature defrost sensor, located on the variable temperature evaporator 11, for detecting the temperature of the variable temperature evaporator 11; wherein, after the freezing chamber, the refrigeration chamber and the variable temperature chamber all reach the required temperature, the freezing fan 17, the refrigeration fan 16 and the variable temperature fan 15 are turned off, and when the temperature of the freezing evaporator 13 is less than or equal to the first preset temperature, the temperature of the refrigeration evaporator 12 and the temperature of the variable temperature evaporator 11 are less than or equal to the second preset temperature, the compressor 1 is controlled to stop; wherein the first preset temperature is less than the second preset temperature. For example, the first preset temperature is -20°C, and the second preset temperature is -25°C. The temperature of the refrigeration evaporator 12 and the variable temperature evaporator 11 can also use two different preset temperatures for the above judgment. In the above scheme, after all three compartments reach the shutdown point, the fans in the compartments stop, but the compressor is delayed until the temperature of the refrigeration and variable temperature defrost sensors is ≤-20℃ and the temperature of the freezing defrost sensor is ≤-25℃. On the one hand, the two flow paths form independent three-circuit, which greatly enhances the reliability and reduces the cost compared with the three-system refrigerator with three flow paths. On the other hand, by maintaining the refrigeration and variable temperature evaporators at a lower temperature, the technical difficulties of the existing three-circuit refrigerators on the market, such as the rapid rise of the freezer temperature during refrigeration and variable temperature refrigeration, and the unstable temperature distribution of the compartments, are avoided. The lower initial refrigeration evaporation temperature can improve the rapid cooling capacity of the refrigerator and improve the user's pain points.

[0040] Example 2

[0041] In a preferred embodiment 2 of the present invention, a refrigerator control method is provided, which is applied to the refrigerator in the above embodiment 1. Specifically, Figure 2 An optional flow chart of the method is shown as follows: Figure 2 As shown, the method includes the following steps S202-S206:

[0042] S202: Detect whether the refrigerated compartment and the variable temperature compartment have refrigeration demand;

[0043] S204: If there is a cooling demand in the refrigerated room or the variable temperature room, the refrigerated fan or the variable temperature fan is controlled to be turned on, and the compressor is controlled to be turned on and run;

[0044] S206: Otherwise, further detect whether the freezer compartment has a cooling demand. When the freezer compartment has a cooling demand, control the freezing fan to turn on, the refrigeration fan and the variable temperature fan to turn off, and control the compressor to run at a low speed.

[0045] In the above embodiment, a refrigerator with a dual-circulation refrigeration system is provided, which has three compartments: a freezing chamber, a cold storage chamber and a variable temperature chamber, and correspondingly provided with a freezing evaporator, a cold storage evaporator and a variable temperature evaporator, wherein the cold storage evaporator and the variable temperature evaporator are connected in parallel and then connected in series with the freezing evaporator, wherein the compressor, the condenser, the throttling device, the cold storage evaporator and the freezing evaporator constitute a first circulation refrigeration system, and the compressor, the condenser, the throttling device, the variable temperature evaporator and the freezing evaporator constitute a second circulation refrigeration system. The series-parallel dual-circulation refrigeration system achieves an independent three-circulation effect, and maintains the cold storage or variable temperature evaporator at a lower temperature during freezing refrigeration, thereby causing excessive fluctuations in the freezing temperature during freezing or variable temperature refrigeration, avoiding the problem of rapid recovery of the freezing chamber temperature and unstable freezing chamber temperature during freezing and variable temperature refrigeration in the existing three-circulation system refrigerators on the market, and improving the temperature stability of the freezing chamber. In addition, a lower initial cold storage evaporation temperature or variable temperature evaporation temperature can improve the rapid cooling capacity of the refrigerator and effectively improve the refrigeration effect of the refrigerator.

[0046] In the preferred embodiment 2 of the present invention, another refrigerator control method is provided. In the refrigeration cycle, there are 4 fans, namely, a freezing fan, a variable temperature fan, a refrigeration fan, and a condensing fan, coded Fa, Fb, Fc, and Fd. Specifically, Figure 3 An optional flow chart of the method is shown as follows: Figure 3 As shown, the method includes the following steps S301-S316:

[0047] S301: Is the compressor turned on? If yes, proceed to step S302, otherwise proceed to step S309; ​​i.e., when the compressor is turned on, the inter-chamber refrigeration demand is judged, and if the compressor is not turned on, the inter-chamber defrosting is judged;

[0048] S302: Is there a refrigeration request in the refrigerating room? If yes, proceed to step S303, otherwise proceed to step S304; the refrigeration request in this embodiment means that the temperature of the temperature sensor inside each compartment is higher than the set start point;

[0049] S303: Turn on Fc; turn on the corresponding fan when there is a cooling request in the compartment;

[0050] S304: Is there a cooling request for the variable temperature room? If yes, proceed to step S305; otherwise, proceed to step S306;

[0051] S305: Turn on Fb; turn on the corresponding fan when there is a cooling request in the compartment;

[0052] S306: Is there a refrigeration request for the freezer? If yes, proceed to step S307, otherwise proceed to step S308;

[0053] S307: Turn on Fa; turn on the corresponding fan when there is a cooling request in the compartment;

[0054] S308: Turn on Fd; turn on the condensing fan for precooling when there is no cooling request in the compartment;

[0055] S309: Ta ≥ 80°C? If yes, proceed to step S310, otherwise proceed to step S311; Ta is the condensation sensor temperature, which detects the condensation temperature in the refrigeration cycle and is generally arranged on the condensation fan bracket in the refrigeration cycle described in this embodiment;

[0056] S310: Open Fd;

[0057] S311: Is the refrigeration room defrosting in return air? If yes, proceed to step S312; otherwise, proceed to step S313;

[0058] S312: Turn on Fc; turn on the corresponding fan when the compartment returns to defrost to speed up defrosting;

[0059] S313: Is the variable temperature room defrosting in the return air conditioner? If yes, proceed to step S314; otherwise, proceed to step S315;

[0060] S314: Turn on Fb; turn on the corresponding fan when the compartment returns to defrost to speed up defrosting;

[0061] S315: Is the freezer compartment defrosting in return air? If yes, proceed to step S316, otherwise proceed to step S301;

[0062] S316: Turn on Fa, turn on the corresponding fan when the compartment returns to defrost, speed up defrosting, and then return to step S301.

[0063] After controlling the compressor to start running, it also includes: detecting the ambient temperature of the refrigerator; determining whether the compressor needs to adjust the speed gear according to the ambient temperature; when the compressor needs to adjust the speed gear, obtaining the set temperature gear of the refrigerated compartment or the variable temperature compartment, and determining the speed gear of the compressor according to the set temperature gear; when the compressor does not need to adjust the speed gear, controlling the compressor speed to remain unchanged. The speed of the compressor is related to the ambient temperature. When the ambient temperature is in a specific range, the compressor speed is not adjusted to avoid frequent adjustments. In other temperature ranges, it is adjusted according to the set temperature of the compartment to meet the set temperature.

[0064] Specifically, determining the speed gear of the compressor according to the set temperature gear includes: obtaining a correspondence table between the set temperature gear of the refrigerated compartment and the speed gear of the compressor at different ambient temperatures, and a correspondence table between the set temperature gear of the variable temperature compartment and the speed gear of the compressor at different ambient temperatures; determining the speed gear of the compressor in the corresponding correspondence table according to the set temperature gear of the refrigerated compartment or the variable temperature compartment. There is a total of 1 compressor in this refrigeration cycle, and its speed is divided into 8 gears, which are coded from low to high as S0, S1, S2, S3, S4, S5, S6, and S7. By adjusting the compressor speed of different set temperature gears of the refrigeration room and the variable temperature room under different ambient temperatures, the refrigeration requests of the three compartments are synchronized, so that the temperature of the freezer reaches or approaches the set temperature gear during the refrigeration of the refrigeration room and the variable temperature room. Similarly, because the speed parameters of the compressor vary greatly in different cabinets, the specific values ​​are not listed in the following table, and only the different compressor speeds are identified by codes. Table 1 is the reference speed table of the compressor of the refrigeration → freezing flow path, and Table 2 is the reference speed table of the compressor of the variable temperature → freezing flow path:

[0065] Table 1

[0066]

[0067]

[0068]

[0069] In addition to the control during the refrigeration cycle, this solution also includes: sequentially detecting whether the refrigeration room, variable temperature room and freezer have reached the compressor stop point; after the refrigeration room, variable temperature room and freezer have reached the compressor stop point, further obtaining the temperature of the refrigeration evaporator, the temperature of the variable temperature evaporator and the temperature of the freezing evaporator, and controlling the operation of the compressor according to the temperature of the refrigeration evaporator, the temperature of the variable temperature evaporator and the temperature of the freezing evaporator; when the refrigeration room, variable temperature room or freezer has not reached the compressor stop point, controlling the compressor to maintain the current operating state. After all three compartments have reached the stop point, the fan in the compartment stops, but the compressor is delayed to shut down.

[0070] Specifically, the operation of the compressor is controlled according to the temperature of the refrigerated evaporator, the temperature of the variable temperature evaporator and the temperature of the frozen evaporator, including: judging in sequence whether the temperature of the refrigerated evaporator is less than or equal to the second preset temperature, whether the temperature of the variable temperature evaporator is less than or equal to the second preset temperature, and whether the temperature of the frozen evaporator is less than or equal to the first preset temperature; if so, controlling the compressor to stop; otherwise, controlling the compressor to maintain the current operating state.

[0071] For example, the first preset temperature is -20°C, the second preset temperature is -25°C, and the temperature of the refrigerated evaporator and the variable temperature evaporator can also use two different preset temperatures for the above judgment. In the above scheme, after all three compartments reach the shutdown point, the fans in the compartments stop, but the compressor is delayed until the temperature of the refrigerated and variable temperature defrost sensors is ≤-20°C and the temperature of the frozen defrost sensor is ≤-25°C before shutting down. On the one hand, two flow paths form independent three-circuit refrigerators, which greatly enhances the reliability and reduces the cost compared with the three-system refrigerator with three flow paths. On the other hand, by maintaining the refrigerated and variable temperature evaporators at a lower temperature, the technical difficulties of the existing three-circuit refrigerators on the market causing the freezer temperature to rise rapidly during refrigeration and variable temperature refrigeration, and the unstable temperature distribution of the compartments are avoided. The lower initial refrigeration evaporation temperature can improve the rapid cooling ability of the refrigerator and improve user pain points.

[0072] Another compressor shutdown control method is provided in a preferred embodiment 2 of the present invention. Specifically, Figure 4 An optional flow chart of the method is shown as follows: Figure 4 As shown, the method includes the following steps S401-S407:

[0073] S401: Has the refrigeration room reached the shutdown point? If yes, proceed to step S402, otherwise repeat the detection after 3 minutes to see if the refrigeration room has reached the shutdown point;

[0074] S402: Has the temperature-changing chamber reached the shutdown point? If yes, proceed to step S403, otherwise return to step S401;

[0075] S403: Has the freezer reached the shutdown point? If yes, proceed to step S404, otherwise return to step S401;

[0076] S404: Refrigeration evaporator defrost sensor ≤ -20°C? If yes, proceed to step S405, otherwise return to step S401;

[0077] S405: Variable temperature evaporator defrost sensor ≤ -20°C? If yes, proceed to step S406, otherwise return to step S401;

[0078] S406: Is the defrost sensor of the refrigeration evaporator ≤ -25°C? If yes, proceed to step S407, otherwise return to step S401;

[0079] S407: The compressor stops.

[0080] In another preferred embodiment of the present invention, the compressor is turned on and the following steps are performed, namely, controlling the compressor to start up and run, including: detecting whether the refrigerator is in the defrosting and defrosting recovery period; if so, detecting whether the refrigerator is in the strong cooling mode or the pre-cooling mode, when the refrigerator is in the strong cooling mode, controlling the compressor to start up and run according to the preset strong cooling speed, and when the refrigerator is in the pre-cooling mode, controlling the compressor to start up and run according to the preset pre-cooling speed; otherwise, further detecting whether the compressor is in the shutdown protection stage, when the compressor is in the shutdown protection stage, delaying the start of the compressor, and when the compressor is not in the shutdown protection stage, controlling the compressor to start up and run according to the set reference speed.

[0081] Specifically, Figure 5 An optional flow chart of the compressor startup control method is shown as follows: Figure 5 As shown, the method includes the following steps S501-S508:

[0082] S501: Is it in the defrosting and recovery period? If yes, go to step S502, otherwise go to step S506;

[0083] S502: Is it in strong cooling? If yes, go to step S503, otherwise go to step S504;

[0084] S503: The compressor is turned on according to the set strong cooling speed;

[0085] S504: Is it in pre-cooling? If yes, go to step S505, otherwise go to step S501 after 3 minutes;

[0086] S505: The compressor is turned on according to the set pre-cooling speed;

[0087] S506: Is the compressor in shutdown protection? If yes, proceed to step S507, otherwise proceed to step S508;

[0088] S507: shutdown protection ends;

[0089] S508: The compressor is turned on according to the set reference speed.

[0090] Through the above scheme, the compressor startup and the starting speed are judged during the compressor startup period, thereby improving the accuracy of compressor control and improving the refrigeration effect and operation stability of the refrigerator.

[0091] Example 3

[0092] Based on the refrigerator control method provided in the above-mentioned embodiment 2, a storage medium containing computer executable instructions is also provided in a preferred embodiment 3 of the present invention. When the computer executable instructions are executed by a computer processor, they are used to execute the refrigerator control method as described above.

[0093] In the above embodiment, a refrigerator with a dual-circulation refrigeration system is provided, which has three compartments: a freezing chamber, a cold storage chamber and a variable temperature chamber, and correspondingly provided with a freezing evaporator, a cold storage evaporator and a variable temperature evaporator, wherein the cold storage evaporator and the variable temperature evaporator are connected in parallel and then connected in series with the freezing evaporator, wherein the compressor, the condenser, the throttling device, the cold storage evaporator and the freezing evaporator constitute a first circulation refrigeration system, and the compressor, the condenser, the throttling device, the variable temperature evaporator and the freezing evaporator constitute a second circulation refrigeration system. The series-parallel dual-circulation refrigeration system achieves an independent three-circulation effect, and maintains the cold storage or variable temperature evaporator at a lower temperature during freezing refrigeration, thereby causing excessive fluctuations in the freezing temperature during freezing or variable temperature refrigeration, avoiding the problem of rapid recovery of the freezing chamber temperature and unstable freezing chamber temperature during freezing and variable temperature refrigeration in the existing three-circulation system refrigerators on the market, and improving the temperature stability of the freezing chamber. In addition, a lower initial cold storage evaporation temperature or variable temperature evaporation temperature can improve the rapid cooling capacity of the refrigerator and effectively improve the refrigeration effect of the refrigerator.

[0094] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0095] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0096] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0097] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0098] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0099] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0100] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0101] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A refrigerator, comprising: A freezer compartment, a refrigerator compartment, a temperature-changing chamber and a refrigeration system, wherein the refrigeration system is a double-cycle refrigeration system, comprising: The compressor, condenser, throttling device and compartment evaporator are connected in sequence; The compartment evaporator comprises: a freezing evaporator, a refrigerating evaporator and a temperature-variable evaporator. The refrigerating evaporator and the temperature-variable evaporator are connected in parallel and then connected in series with the freezing evaporator. The compressor, the condenser, the throttling device, the refrigerating evaporator and the freezing evaporator constitute a first circulating refrigeration system, and the compressor, the condenser, the throttling device, the temperature-variable evaporator and the freezing evaporator constitute a second circulating refrigeration system.

2. The refrigerator according to claim 1, characterized in that: The refrigeration system further comprises: A condensing fan, located at the condenser; A refrigeration fan, located at the refrigeration evaporator; A refrigeration fan, located at the refrigeration evaporator; A variable temperature fan, located at the variable temperature evaporator; When the freezing compartment has a cooling demand and the refrigerating compartment and the temperature-variable compartment have no cooling demand, the freezing fan is turned on, the refrigerating fan and the temperature-variable fan are turned off, and the compressor runs at a low speed.

3. The refrigerator according to claim 2, characterized in that: Also includes: A freezing and defrosting sensor, located on the freezing evaporator, for detecting the temperature of the freezing evaporator; A refrigeration defrost sensor, located on the refrigeration evaporator, for detecting the temperature of the refrigeration evaporator; A variable temperature defrost sensor, located on the variable temperature evaporator, for detecting the temperature of the variable temperature evaporator; Among them, after the freezer compartment, the refrigeration compartment and the variable temperature chamber all reach the required temperature, the refrigeration fan, the refrigeration fan and the variable temperature fan are turned off, and when the temperature of the refrigeration evaporator is less than or equal to the first preset temperature, the temperature of the refrigeration evaporator and the temperature of the variable temperature evaporator are less than or equal to the second preset temperature, the compressor is controlled to stop; wherein the first preset temperature is lower than the second preset temperature.

4. A refrigerator control method, applied to the refrigerator as claimed in any one of claims 1 to 3, characterized in that: The method comprises: Check whether the cold storage room and variable temperature room have refrigeration demand; If the refrigerated compartment or the variable temperature compartment has a cooling demand, the refrigerated fan or the variable temperature fan is controlled to be turned on, and the compressor is controlled to start running; Otherwise, further detect whether the freezer compartment has a refrigeration demand. When the freezer compartment has a refrigeration demand, control the refrigeration fan to turn on, the refrigeration fan and the variable temperature fan to turn off, and control the compressor to run at a low speed.

5. The method according to claim 4, characterized in that After the compressor is started and operated, the method further comprises: Detect the ambient temperature of the refrigerator; Determining whether the compressor needs to adjust the speed gear according to the ambient temperature; When the speed gear of the compressor needs to be adjusted, the set temperature gear of the refrigerated compartment or the temperature-variable compartment is obtained, and the speed gear of the compressor is determined according to the set temperature gear; When the compressor does not need to adjust the speed gear, the speed of the compressor is controlled to remain unchanged.

6. The method according to claim 5, characterized in that Determining the speed gear of the compressor according to the set temperature gear includes: Obtaining a correspondence table between the set temperature gear of the refrigerating compartment and the speed gear of the compressor at different ambient temperatures, and a correspondence table between the set temperature gear of the variable temperature compartment and the speed gear of the compressor at different ambient temperatures; The speed gear of the compressor is determined in the corresponding relationship table according to the set temperature gear of the refrigerating compartment or the temperature-variable compartment.

7. The method according to claim 4, characterized in that Also includes: sequentially detecting whether the refrigerating chamber, the temperature-changing chamber and the freezing chamber have reached the compressor stop point; After the refrigerating chamber, the temperature-variable temperature evaporator and the freezing chamber reach the compressor stop point, further obtaining the temperature of the refrigerating evaporator, the temperature of the temperature-variable temperature evaporator and the temperature of the freezing evaporator, and controlling the operation of the compressor according to the temperature of the refrigerating evaporator, the temperature of the temperature-variable temperature evaporator and the temperature of the freezing evaporator; When the temperature of the refrigerating chamber, the temperature changing chamber or the freezing chamber has not reached the compressor stop point, the compressor is controlled to maintain a current operating state.

8. The method according to claim 7, characterized in that Controlling the operation of the compressor according to the temperature of the refrigerating evaporator, the temperature of the temperature-variable evaporator and the temperature of the freezing evaporator comprises: sequentially determining whether the temperature of the refrigerating evaporator is less than or equal to a second preset temperature, whether the temperature of the temperature-variable evaporator is less than or equal to the second preset temperature, and whether the temperature of the freezing evaporator is less than or equal to a first preset temperature; If yes, controlling the compressor to stop; Otherwise, the compressor is controlled to maintain the current operating state.

9. The method according to claim 4, characterized in that The controlling the compressor to start up and run comprises: Detecting whether the refrigerator is in a defrosting or defrosting recovery period; If yes, detecting whether the refrigerator is in a strong cooling mode or a pre-cooling mode, when the refrigerator is in the strong cooling mode, controlling the compressor to start and run according to a preset strong cooling speed, and when the refrigerator is in the pre-cooling mode, controlling the compressor to start and run according to a preset pre-cooling speed; Otherwise, further detect whether the compressor is in the shutdown protection stage. When the compressor is in the shutdown protection stage, delay the start of the compressor. When the compressor is not in the shutdown protection stage, control the compressor to start and run according to the set reference speed.

10. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to perform the refrigerator control method according to any one of claims 4 to 9 when executed by a computer processor.

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