Refrigerating box temperature and humidity control method and refrigerating box

Abstract

The invention relates to the technical field of refrigerator temperature control, in particular to a refrigerator temperature and humidity control method and a refrigerator, and aims to solve the problem that the temperature and humidity in the refrigerator are affected due to the fact that the surface temperature of an evaporator fluctuates due to starting and stopping of a compressor of an existing refrigerator. In order to achieve the purpose, the control method comprises the steps that a first air door is controlled to be opened, the opening angle is gradually increased to the maximum, and a refrigeration evaporator is in a refrigeration working state; the outlet temperature of the mixed air duct and the indoor temperature of the refrigeration chamber are obtained; the outlet temperature is compared with the first preset temperature, and the indoor temperature is compared with the second preset temperature; and when the outlet temperature is smaller than the first preset temperature and the indoor temperature is larger than the second preset temperature, the refrigerating box is controlled to enter a temperature adjusting mode. According to the invention, the circulating air in the refrigerating chamber is heated and cooled by using the heat and cold of the refrigerant circulating loop, and then the desired outlet air temperature is obtained after mixing, so that the outlet air temperature is prevented from being too high or too low.

Description

Technical Field

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

[0002] A refrigerator is a storage device used to refrigerate various items, including but not limited to: freezers, wine cabinets, beverage cabinets, blood refrigerators, medicine cabinets and biological storage cabinets. In existing refrigerators, as the compressor starts and stops, the surface temperature of the evaporator in the box will fluctuate, which will cause the temperature of the air blown out from the air outlet to fluctuate, and it will be hot and cold. Correspondingly, the humidity will also fluctuate up and down over a large range, which will affect the temperature and humidity distribution in the box. At present, the temperature blown out from the air outlet is generally increased by adding a heating wire. This solution will increase the energy consumption of the product, and when the heating wire is heated, the relative humidity of the air will be reduced while the air temperature is increased, which will cause the humidity of the whole machine to decrease.

[0003] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0004] The present invention aims to solve the above technical problem, that is, to solve the problem that the temperature and humidity in the existing refrigerated box are affected by the start and stop of the compressor, which causes the surface temperature of the evaporator to fluctuate.

[0005] In a first aspect, the present invention provides a refrigerator, which comprises a box body, a refrigeration system, and a refrigerated compartment, an air mixing duct, and an air outlet duct arranged in the box body and connected to each other; the refrigeration system comprises an electromagnetic valve group, a four-way reversing valve group, and a compressor, a condenser, a refrigeration evaporator, a temperature regulating evaporator, and an expansion member connected to each other to form a refrigerant circulation loop, and the electromagnetic valve group is configured to control the on-off of the refrigerant between the compressor and the condenser, and the on-off of the refrigerant between the compressor and the refrigeration evaporator and / or the temperature regulating evaporator. The four-way reversing valve group is configured to control the flow direction of the refrigerant between the compressor, the condenser, the refrigeration evaporator and the temperature regulating evaporator; the mixed air duct includes a refrigeration air duct and a temperature regulating air duct arranged in parallel, the refrigeration air duct is provided with the refrigeration evaporator and the first air door, the temperature regulating evaporator and the second air door are provided in the temperature regulating air duct, the first air door is configured to control the connection and disconnection between the refrigeration compartment and the refrigeration air duct, and the second air door is configured to control the connection and disconnection between the refrigeration compartment and the temperature regulating air duct.

[0006] In a second aspect, the present invention further provides a method for controlling temperature and humidity in a refrigerator, the refrigerator comprising a box body and a refrigerator compartment, an air mixing duct and an air outlet duct arranged in the box body and connected to each other, the air mixing duct comprising a refrigeration duct and a temperature regulating duct arranged in parallel, a refrigeration evaporator and a first air door arranged in the refrigeration duct, a temperature regulating evaporator and a second air door arranged in the temperature regulating duct, the first air door being configured to control the connection and disconnection between the refrigerator compartment and the refrigeration duct, and the second air door being configured to control the connection and disconnection between the refrigerator compartment and the temperature regulating duct; the control The method includes: when the refrigerator is in a cooling mode, controlling the first air door to open and gradually opening the opening angle to a maximum, and the refrigeration evaporator is in a cooling working state; obtaining the outlet temperature Ta of the air mixing duct and the indoor temperature Tb of the refrigerated compartment; comparing the outlet temperature Ta with a first preset temperature T1 and the indoor temperature Tb with a second preset temperature T2; when the outlet temperature Ta is less than the first preset temperature T1 and the indoor temperature Tb is greater than the second preset temperature T2, controlling the refrigerator to enter a temperature adjustment mode.

[0007] In the specific implementation of the above-mentioned refrigerator temperature and humidity control method, the step of "controlling the refrigerator to enter the temperature control mode" specifically includes: controlling the second air door to open, and the temperature control evaporator is in the temperature control working state; obtaining the opening angle of the second air door; when the opening angle reaches the first preset angle A1 and the continuous opening time reaches the first preset time t1, judging whether the outlet temperature Ta is less than the first preset temperature T1 and whether the indoor temperature Tb is greater than the second preset temperature T2; according to the judgment result, controlling the opening angle of the second air door and the working state of the temperature control evaporator; wherein A1=K1×90°, K1 is the preset opening coefficient, and the value range of K1 is 0~1.

[0008] In the specific implementation of the above-mentioned refrigerator temperature and humidity control method, the step of "controlling the opening angle of the second air door and the working state of the temperature-regulating evaporator according to the judgment result" specifically includes: when the outlet temperature Ta is less than the first preset temperature T1 and the indoor temperature Tb is greater than the second preset temperature T2, controlling the opening angle of the second air door to increase to the second preset angle A2; obtaining the actual value of A2; according to the actual value, controlling the opening angle of the second air door and the working state of the temperature-regulating evaporator; wherein A2=(1+α)×K1×90°, α is the adjustment coefficient, the value range of α is 0~1, and K1 is the preset opening coefficient.

[0009] In a specific implementation of the above-mentioned refrigerator temperature and humidity control method, the step of "controlling the opening angle of the second air door and the working state of the temperature regulating evaporator according to the actual value" specifically includes: when A2 < 90°, if the outlet temperature Ta reaches the first preset temperature T1, the second air door is controlled to maintain the current opening angle, and the temperature regulating evaporator maintains the temperature regulating working state; and / or when A2 ≥ 90°, if the outlet temperature Ta is less than the first preset temperature T1 and the indoor temperature Tb is greater than the second preset temperature T2, the opening angle of the second air door is controlled to switch to the first preset angle A1 and gradually increase at the first preset angle A1, and the temperature regulating evaporator switches to the defrosting working state.

[0010] In a specific implementation of the above-mentioned refrigerator temperature and humidity control method, the step of "controlling the opening angle of the second air door and the working state of the thermostatic evaporator according to the actual numerical value" further includes: when A2 ≥ 90°, and the thermostatic evaporator is switched to the defrosting working state, if the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the second air door is controlled to maintain the current opening angle until the indoor temperature Tb is lower than the second preset temperature T2.

[0011] In a specific implementation of the above-mentioned refrigerator temperature and humidity control method, the refrigerator also includes a compressor, a condenser, a first solenoid valve, a second solenoid valve and a four-way reversing valve group. In the refrigerant circulation loop, the first solenoid valve is configured to control the on-off of the refrigerant between the compressor and the condenser, the second solenoid valve is configured to control the on-off of the refrigerant between the compressor and the refrigeration evaporator and / or the temperature control evaporator, and the four-way reversing valve group is configured to control the flow direction of the refrigerant between the compressor, the condenser, the refrigeration evaporator and the temperature control evaporator; the step of "the refrigeration evaporator is in a refrigeration working state" specifically includes: controlling the first solenoid valve to open, the second solenoid valve to close, switching the four-way reversing valve group, so that the compressor, the condenser and the refrigeration evaporator are connected to each other to form a refrigerant circulation loop.

[0012] In the specific implementation of the above-mentioned refrigerator temperature and humidity control method, the step of "the temperature-regulating evaporator is in a temperature-regulating working state" specifically includes: controlling the first solenoid valve to open, the second solenoid valve to close, and switching the four-way reversing valve group so that the compressor, the condenser, the temperature-regulating evaporator and the refrigeration evaporator are connected to each other to form a refrigerant circulation loop.

[0013] In the specific implementation of the above-mentioned refrigerator temperature and humidity control method, the step of "the temperature-controlled evaporator is switched to the defrosting working state" specifically includes: controlling the first solenoid valve to close, the second solenoid valve to open, and switching the four-way reversing valve group so that the compressor, the temperature-controlled evaporator and the refrigeration evaporator are connected to each other to form a refrigerant circulation loop.

[0014] In a specific implementation of the above-mentioned method for controlling the temperature and humidity of a refrigerator, the control method further includes: obtaining the operating time of the compressor; when the operating time reaches a second preset time t2, controlling the refrigerator to switch to a defrost mode; the step of "controlling the refrigerator to switch to a defrost mode" specifically includes: controlling the first damper to close, and controlling the first solenoid valve to close, the second solenoid valve to open, and switching the four-way reversing valve group so that the compressor, the refrigeration evaporator and the temperature control evaporator are connected to each other to form a refrigerant circulation loop.

[0015] In the case of adopting the above technical scheme, the present invention sets two air ducts and two evaporators, utilizes the heat and cold capacity of the refrigerant circulation loop itself, makes one of the air ducts and evaporator have a refrigeration function, and the other air duct and evaporator have a temperature adjustment function, heats and cools the circulating air in the cold storage room, and then obtains the desired outlet air temperature after mixing, so as to avoid the outlet air temperature being too high or too low.

[0016] In addition, during the switching process between the refrigeration evaporator and the thermostatic evaporator, condensed water will be generated on the surface of the original refrigeration evaporator after defrosting. Then, when the original refrigeration evaporator is switched to the thermostatic mode, the return air will not be dried after passing through the moistened original refrigeration evaporator, thereby ensuring the humidity of the air flowing out of the mixed air duct outlet, and then ensuring the humidity in the cold storage room, avoiding the problem of too low humidity in the box when using electric heating to increase the temperature, thereby drying out the products in the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0018] Figure 1 It is a structural schematic diagram of the refrigerator of the present invention;

[0019] Figure 2 is a schematic diagram of the refrigerant circulation when the refrigerator of the present invention is in a refrigeration mode;

[0020] Figure 3 It is a refrigerant circulation principle diagram when the temperature regulating evaporator of the present invention is in the temperature regulating working state;

[0021] Figure 4 It is a refrigerant circulation principle diagram when the temperature-controlled evaporator of the present invention is in a defrosting working state;

[0022] Figure 5 is a schematic diagram of the refrigerant circulation when the refrigerator of the present invention is in the defrosting mode;

[0023] Figure 6 It is a flow chart of the main steps of the method for controlling the temperature and humidity of a refrigerator of the present invention;

[0024] Figure 7 It is a possible complete step flow chart of the method for controlling the temperature and humidity of a refrigerator of the present invention;

[0025] Among them, 1. cabinet; 2. cold storage compartment; 3. mixed air duct; 31. refrigeration air duct; 32. temperature control air duct; 4. air outlet duct; 5. refrigeration evaporator; 6. first air door; 7. temperature control evaporator; 8. second air door; 9. first temperature sensor; 10. evaporating fan; 11. compressor; 12. condenser; 13. first solenoid valve; 14. second solenoid valve; 15. first four-way reversing valve; 16. first filter; 17. first capillary tube; 18. second four-way reversing valve; 19. second capillary tube; 20. second filter. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not used to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0027] It should be noted that in the description of the present invention, the terms such as "inside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the ordinal numbers "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, it should be noted that in the description of the present invention, although the various steps of the control method of the present invention are described in this application in a specific order, these orders are not restrictive. Without departing from the basic principles of the present invention, those skilled in the art can perform the steps in a different order.

[0030] See first Figure 1 , which is a schematic diagram of the structure of the refrigerator of the present invention. Figure 1 As shown, the refrigerator includes a box body 1 and a refrigerating compartment 2, an air mixing duct 3 and an air outlet duct 4 which are arranged in the box body 1 and are connected to each other. The air mixing duct 3 includes a refrigerating duct 31 and a temperature regulating duct 32 which are arranged in parallel. A refrigerating evaporator 5 and a first air door 6 are arranged in the refrigerating duct 31, and a temperature regulating evaporator 7 and a second air door 8 are arranged in the temperature regulating duct 32. The first air door 6 is arranged to control the connection and disconnection between the refrigerating compartment 2 and the refrigerating duct 31, and the second air door 8 is arranged to control the connection and disconnection between the refrigerating compartment 2 and the temperature regulating duct 32. The flowing air at the end of the refrigerating duct 31 and the end of the temperature regulating duct 32 can be mixed at the outlet of the air mixing duct 3 and then enter the refrigerating compartment 2 through the air outlet duct 4. An evaporating fan 10 is arranged in the air outlet duct 4 to realize the circulation of air between the refrigerating compartment 2, the air mixing duct 3 and the air outlet duct 4. A first temperature sensor 9 is provided at the outlet of the mixed air duct 3, which can detect the temperature of the mixed air flowing through the refrigeration air duct 31 and / or the temperature control air duct 32. A second temperature sensor (not shown in the figure) is provided in the refrigerated compartment 2, which can detect the indoor temperature in the refrigerated compartment 2.

[0031] Then see Figure 2-Figure 5 , which is a schematic diagram of the refrigerant circulation principle of the refrigerator of the present invention. Figure 2-Figure 5As shown, the refrigerator includes a compressor 11, a condenser 12, a first solenoid valve 13, a second solenoid valve 14, a four-way reversing valve group, an expansion member, a first filter 16 and a second filter 20. In the refrigerant circulation loop, the first solenoid valve 13 is configured to control the on-off of the refrigerant between the compressor 11 and the condenser 12, and the second solenoid valve 14 is configured to control the on-off of the refrigerant between the compressor 11 and the refrigeration evaporator 5 and / or the temperature control evaporator 7. The four-way reversing valve group is configured to control the flow direction of the refrigerant between the compressor 11, the condenser 12, the refrigeration evaporator 5 and the temperature regulating evaporator 7. The four-way reversing valve group includes a first four-way reversing valve 15 and a second four-way reversing valve 18. The four interfaces of the first four-way reversing valve 15 are respectively connected to one of the interfaces of the compressor 11 or the condenser 12, the refrigeration evaporator 5, the temperature regulating evaporator 8 and the second four-way reversing valve 18. The four interfaces of the second four-way reversing valve 18 are respectively connected to the compressor 11, the refrigeration evaporator 5, the temperature regulating evaporator 8 and one of the interfaces corresponding to the first four-way reversing valve 15. By switching the flow direction of the refrigerant, the refrigeration evaporator 5 and the temperature regulating evaporator 7 can be controlled to enter the refrigeration mode or the temperature regulating mode. The refrigeration evaporator 5 provides cooling capacity during refrigeration to reduce the temperature of the air in the refrigerated compartment 2. The temperature regulating evaporator 7 can be used as an auxiliary condenser 12 during temperature regulation to provide heat to the air in the refrigerated compartment 2. The compressor 11 is used to compress the gaseous refrigerant and drive the refrigerant to circulate in the entire refrigeration system. The condenser 12 is the main heat dissipation device, which is used to reduce the temperature of the high-temperature refrigerant and dissipate the heat of the high-temperature refrigerant into the air. The expansion component includes a first capillary tube 17 and a second capillary tube 19. The first filter 16 and the first capillary tube 17 are connected to the refrigeration evaporator 5. The second filter 20 and the second capillary tube 19 are connected to the temperature regulating evaporator 7. The first filter 16 and the second filter 20 are used to filter the impurities and moisture of the refrigerant in the refrigerant circulation loop. The first capillary tube 17 and the second capillary tube 19 are expansion components, which have the function of reducing temperature and pressure, and are used to throttle the high-temperature and high-pressure gaseous refrigerant into a low-temperature and low-pressure liquid refrigerant.

[0032] Then see Figure 6 , which is a flow chart of the main steps of the method for controlling the temperature and humidity of a refrigerator of the present invention. Figure 6 As shown, the control method of the present invention includes:

[0033] S1, when the refrigerator is in cooling mode, the first damper 6 is controlled to open and the opening angle is opened to the maximum, and the refrigeration evaporator 5 is in cooling working state;

[0034] S2, obtaining the outlet temperature Ta of the air mixing duct 3 and the indoor temperature Tb of the refrigerated compartment 2;

[0035] S3, comparing the outlet temperature Ta with the first preset temperature T1 and the indoor temperature Tb with the second preset temperature T2;

[0036] S4, when the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the refrigerator is controlled to enter the temperature adjustment mode;

[0037] In the above steps, when the refrigerator is in the refrigeration mode, the first damper 6 is first controlled to open and the opening angle is opened to the maximum, wherein the maximum opening angle of the first damper is 90°, and the refrigeration evaporator 5 is in the refrigeration working state. At this time, the air in the refrigeration compartment 2 enters the refrigeration air duct 31, and the refrigeration evaporator 5 cools the air and then flows back to the refrigeration compartment 2 through the air outlet duct 4 to reduce the temperature of the air in the refrigeration compartment 2. In this state, the refrigerant circulation principle diagram is as follows Figure 2 As shown, the step of "the refrigeration evaporator 5 is in the refrigeration working state" specifically includes: controlling the first electromagnetic valve 13 to open, the second electromagnetic valve 14 to close, switching the first four-way reversing valve 15 and the second four-way reversing valve 18, so that the compressor 11, the condenser 12, the first filter 16, the first capillary tube 17 and the refrigeration evaporator 5 are connected to each other to form a refrigerant circulation loop. When the indoor temperature Tb of the refrigerated compartment 2 is less than or equal to the second preset temperature T2, it indicates that the indoor temperature of the refrigerated compartment 2 reaches the preset temperature, then the compressor 11 is controlled to stop and stop refrigerating the refrigerated compartment 2. When the indoor temperature Tb of the refrigerated compartment 2 is greater than the second preset temperature T2+temperature deviation δT2, it indicates that the indoor temperature of the refrigerated compartment 2 is higher than the preset temperature, then the compressor 11 is controlled to run and start refrigerating the refrigerated compartment 2 to reduce the indoor temperature of the refrigerated compartment 2 to the preset temperature. In this way, the indoor temperature of the refrigerated compartment can be controlled to fluctuate within a temperature range instead of a temperature value, which can reduce the number of compressor starts and stops to a certain extent. As the compressor 11 starts and stops, the surface temperature of the evaporator will fluctuate, thus affecting the indoor temperature and humidity. When the outlet temperature Ta is less than the first preset temperature T1 and the indoor temperature Tb is greater than the second preset temperature T2, it indicates that the outlet temperature of the mixed air duct 3 is low at this time. If the compressor 11 is running, the air temperature blown to the refrigerated compartment 2 will be low, thereby affecting the indoor temperature and humidity distribution. At this time, the refrigerator is controlled to enter the temperature adjustment mode to increase the outlet temperature of the mixed air duct 3 to ensure the balance of the air temperature blown to the refrigerated compartment 2.

[0038] Among them, T2+δT2>T1>T2.

[0039] It should be noted that, combined with Figure 1As shown, although the present application is described in conjunction with the refrigeration duct 31 being arranged on the right side and the temperature regulating duct 32 being arranged on the left side, this is not restrictive, and the refrigeration duct 31 and the temperature regulating duct 32 can be switched with each other, and correspondingly, the refrigeration evaporator 5 and the temperature regulating evaporator 7 can also be switched with each other, that is, the refrigeration duct 31 can also be the temperature regulating duct 32, in which case the refrigeration evaporator 5 is the temperature regulating evaporator 7, and in which case the duct has the function of lowering the temperature of the air in the refrigerated compartment 2, and the temperature regulating duct 32 can also be the refrigeration duct 31, in which case the temperature regulating evaporator 7 is the refrigeration evaporator 5, and in which case the duct has the function of providing heat to the air in the refrigerated compartment 2. Those skilled in the art can set the functions of the two ducts as needed, or it can be the system default, and the present invention does not impose any limitation on this.

[0040] In step S4, the step of “controlling the refrigerator to enter the temperature adjustment mode” specifically includes:

[0041] S41, control the second damper 8 to open, and the temperature-adjusting evaporator 7 is in a temperature-adjusting working state;

[0042] S42, obtaining the opening angle of the second damper 8;

[0043] S43, when the opening angle reaches the first preset angle A1 and the continuous opening time reaches the first preset time t1, determine whether the outlet temperature Ta is less than the first preset temperature T1 and whether the indoor temperature Tb is greater than the second preset temperature T2;

[0044] S44, controlling the opening angle of the second damper 8 and the working state of the temperature-adjusting evaporator 7 according to the judgment result;

[0045] Among them, A1=K1×90°, K1 is the preset opening coefficient, the value range of K1 is 0~1, and the value is fixed in a working cycle. The technical personnel in this field obtain the mapping relationship between K1 and time based on multiple test results, and then determine the corresponding value of K1 according to the first preset time t1. Exemplarily, in the first preset angle, the value of K1 is less than 1 / 2, and A1<90°.

[0046] In step S41, the refrigerant circulation principle diagram is as follows Figure 3 As shown, the step of "the temperature-controlled evaporator 7 is in the temperature-controlled working state" specifically includes: controlling the first solenoid valve 13 to open, the second solenoid valve 14 to close, and switching the four-way reversing valve group so that the compressor 11, the condenser 12, the temperature-controlled evaporator 7 and the refrigeration evaporator 5 are connected to each other to form a refrigerant circulation loop.

[0047] In the above steps, when the refrigerator is in the temperature control mode, the refrigerant flow direction is switched so that part of the high-temperature refrigerant flows into the temperature control evaporator 7, and the second damper 8 is controlled to open, so that part of the air in the refrigerated compartment 2 enters the refrigeration air duct 31, and the other part enters the temperature control air duct 32, and the opening angle of the second damper 8 is controlled to open to the first preset angle A1 to control the air volume of the air in the refrigerated compartment 2 entering the temperature control air duct 32, wherein the refrigeration evaporator 5 cools the air entering the refrigeration air duct 31, and the temperature control evaporator 7 heats the air entering the temperature control air duct 32, thereby increasing the temperature of the return air after mixing.

[0048] In step S44, the step of "controlling the opening angle of the second damper 8 and the working state of the temperature-adjusting evaporator 7 according to the judgment result" specifically includes:

[0049] S441, when the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, controlling the opening angle of the second damper 8 to increase to the second preset angle A2;

[0050] S442, obtaining the actual value of A2;

[0051] S443, controlling the opening angle of the second damper 8 and the working state of the temperature-adjusting evaporator 7 according to the actual value;

[0052] Among them, A2=(1+α)×K1×90°, α is the adjustment coefficient, K1 is the preset opening coefficient, the value range of α is 0~1, and the value range of K1 is 0~1. Specifically, A2 changes according to the formula of (1+α)×K1×90°, when (1+α)×K1<1, A2<90°, when (1+α)×K1≥1, A2≥90°, at this time, α=0, K1=1, and the opening angle of the second damper 8 reaches the maximum.

[0053] In step S443, the step of "controlling the opening angle of the second damper 8 and the working state of the temperature-adjusting evaporator 7 according to the actual value" specifically includes:

[0054] S4431, when A2 < 90°, if the outlet temperature Ta reaches the first preset temperature T1, the second damper 8 is controlled to maintain the current opening angle, and the temperature-adjusting evaporator 7 maintains the current working state;

[0055] S4432, when A2 ≥ 90°, if the outlet temperature Ta is less than the first preset temperature T1 and the indoor temperature Tb is greater than the second preset temperature T2, the opening angle of the second damper 8 is controlled to switch to the first preset angle K1×90° and gradually increase at the first preset angle K1×90°, and the temperature regulating evaporator 7 is switched to the defrosting working state;

[0056] Furthermore, the refrigerant cycle schematic diagram is as follows Figure 4 As shown, the step of "switching the temperature-controlled evaporator 7 to the defrosting working state" specifically includes: controlling the first solenoid valve 13 to close, the second solenoid valve 14 to open, and switching the four-way reversing valve group so that the compressor 11, the temperature-controlled evaporator 7 and the refrigeration evaporator 5 are connected to each other to form a refrigerant circulation loop.

[0057] S4433, when A2≥90°, and the thermostatic evaporator 7 is switched to the defrosting working state, if the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the second damper 8 is controlled to maintain the current opening angle until the indoor temperature Tb is lower than the second preset temperature T2.

[0058] In the above steps, when the opening angle of the second damper 8 is opened to the first preset angle K1×90° and reaches the first preset time t1, if the outlet temperature Ta is still lower than the first preset temperature T1 and the indoor temperature Tb is still higher than the second preset temperature T2, it is necessary to increase the opening angle of the second damper 8 to A2 to increase the intake volume of hot air and continue to increase the temperature of the return air after mixing.

[0059] Specifically, when A2 is less than 90°, it indicates that the opening angle of the second damper 8 has not reached the maximum. At this time, if the outlet temperature Ta reaches the first preset temperature T1, the second damper 8 is controlled to maintain the current opening angle, and the temperature-controlled evaporator 7 maintains the current working state, that is, the temperature-controlled working state, to increase the temperature of the return air after mixing.

[0060] When A2≥90°, it indicates that the opening angle of the second damper 8 has reached the maximum. At this time, if the outlet temperature is still lower than the first preset temperature T1, it means that the temperature of the thermostatic evaporator 7 in the thermostatic working state is low, and the heat provided cannot neutralize the cold provided by the refrigeration evaporator 5, which leads to a low temperature after the return air is mixed. For this reason, the thermostatic evaporator 7 is switched to the defrosting working mode, and the high-temperature gas discharged by the compressor 11 does not pass through the condenser 12, but directly enters the thermostatic evaporator 7, so as to increase the temperature of the thermostatic evaporator 7. However, since the opening angle of the second damper 8 has been opened to the maximum at this time, the second damper 8 with the maximum opening and the thermostatic evaporator 7 with the highest temperature may work together to make the temperature of the return air mixed too high. Therefore, when the temperature of the thermostatic evaporator 7 is raised, the opening angle of the second damper 8 is controlled to start from a small opening, that is, to gradually increase from A1, so as to avoid the temperature of the return air mixed too high.

[0061] When A2≥90°, it indicates that the opening angle of the second air damper 8 has reached the maximum, and when the thermostatic evaporator 7 switches to the defrosting working state, if the outlet temperature Ta is still lower than the first preset temperature T1, it means that even if the hot air volume and the temperature of the thermostatic evaporator 7 are pulled to the highest, they cannot neutralize the low-temperature cooling capacity provided by the refrigeration evaporator 5. At this time, the current opening angle of the second air damper 8 is maintained, that is, opened to the maximum, until the indoor temperature Tb is lower than the second preset temperature T2.

[0062] The control method also includes:

[0063] S5, obtaining the operating time of the compressor 11;

[0064] S6, when the running time reaches the second preset time t2, the refrigerator is controlled to switch to the defrosting mode.

[0065] Furthermore, the refrigerant cycle schematic diagram is as follows Figure 5 As shown, the step of "controlling the refrigerator to switch to defrost mode" specifically includes: controlling the first damper 6 to close, and controlling the first solenoid valve 13 to close, the second solenoid valve 14 to open, switching the four-way reversing valve group, so that the compressor 11, the refrigeration evaporator 5 and the temperature control evaporator 7 are connected to each other to form a refrigerant circulation loop.

[0066] In the above steps, when the cumulative running time of the compressor 11 reaches the second preset time t2, since frost is accumulated on the surface of the refrigeration evaporator 5, it is necessary to defrost the refrigeration evaporator 5. At this time, the first damper 6 is closed to prevent the outflow of defrosting heat, and the second damper 8 is opened, and the temperature regulating evaporator 7 acts as a refrigeration unit to control the temperature in the refrigerated compartment 2.

[0067] When the defrosting of the refrigeration evaporator 5 is completed, the refrigeration evaporator 5 and the temperature regulating evaporator 7 switch operation. After the refrigeration evaporator 5 and the temperature regulating evaporator 7 are switched, the original temperature regulating evaporator 7 is switched to the refrigeration evaporator 5, and the original refrigeration evaporator 5 is switched to the temperature regulating evaporator 7.

[0068] In summary, in the preferred technical solution of the present invention, two air ducts and two evaporators are provided, and the heat and cold of the refrigerant circulation loop are utilized so that one of the air ducts and the evaporator has a refrigeration function, and the other air duct and the evaporator has a temperature adjustment function, so that the circulating air in the refrigerated compartment 2 is heated and cooled, and then the desired outlet air temperature is obtained after mixing, thereby avoiding the outlet air temperature being too high or too low.

[0069] In addition, during the switching process, after the refrigeration evaporator 5 and the temperature control evaporator 7 have been defrosted, condensed water will be generated on the surface of the original refrigeration evaporator 5. Then, when the original refrigeration evaporator 5 is switched to the temperature control mode, the return air will not be dried after passing through the moistened original refrigeration evaporator 5, thereby ensuring the humidity of the air flowing out from the outlet of the mixed air duct 3, and then ensuring the humidity in the refrigerated compartment 2, avoiding the problem of too low humidity in the box when using electric heating to increase the temperature, thereby drying out the items in the box.

[0070] Refer to the following Figure 7 , which is a possible complete step flow chart of the refrigerator temperature and humidity control method of the present invention.

[0071] S101, when the refrigerator is in cooling mode, the first damper 6 is controlled to open and the opening angle is opened to the maximum, and the cooling evaporator 5 is in cooling working state;

[0072] S102, obtaining the outlet temperature Ta of the air mixing duct 3 and the indoor temperature Tb of the refrigerated compartment 2;

[0073] S103, comparing the outlet temperature Ta with the first preset temperature T1 and the indoor temperature Tb with the second preset temperature T2;

[0074] When Ta<T1, Tb>T2, execute step S104;

[0075] S104, controlling the second damper 8 to open, and the temperature-adjusting evaporator 7 to be in a temperature-adjusting working state;

[0076] S105, obtaining the opening angle of the second damper 8;

[0077] When the opening angle reaches the first preset angle A1 and the continuous opening time reaches the first preset time t1, step S106 is executed;

[0078] S106, determining whether the outlet temperature Ta is less than a first preset temperature T1 and whether the indoor temperature Tb is greater than a second preset temperature T2;

[0079] If yes, execute step S107;

[0080] If not, execute step S104;

[0081] S107, controlling the opening angle of the second damper 8 to increase to a second preset angle A2;

[0082] S108, obtaining the actual value of A2;

[0083] When A2<90°, if the outlet temperature Ta reaches the first preset temperature T1, step S109 is executed;

[0084] When A2≥90°, if the outlet temperature Ta is less than the first preset temperature T1 and the indoor temperature Tb is greater than the second preset temperature T2, step S110 is executed;

[0085] When A2≥90°, and the temperature-adjusting evaporator 7 is switched to the defrosting working state, if the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, step S120 is executed;

[0086] S109, controlling the second damper 8 to maintain the current opening angle, and the temperature-adjusting evaporator 7 to maintain the temperature-adjusting working state;

[0087] S110, controlling the opening angle of the second damper 8 to switch to the first preset angle A1 and gradually increase the opening angle A1, and the temperature regulating evaporator 7 switches to the defrosting working state;

[0088] S120, controlling the second damper 8 to maintain the current opening angle until the indoor temperature Tb is lower than the second preset temperature T2;

[0089] S130, obtaining the operating time of the compressor 11;

[0090] When the running time reaches the second preset time t2, executing step S140;

[0091] S140, controlling the refrigerator to switch to a defrost mode.

[0092] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A refrigerator, characterized in that: The refrigerator comprises a box body, a refrigeration system, and a refrigeration compartment, an air mixing duct, and an air outlet duct which are arranged in the box body and communicate with each other; The refrigeration system comprises a solenoid valve group, a four-way reversing valve group, and a compressor, a condenser, a refrigeration evaporator, a temperature-controlled evaporator, and an expansion member that are interconnected to form a refrigerant circulation loop. The solenoid valve group is configured to control the connection and disconnection of the refrigerant between the compressor and the condenser, and the connection and disconnection of the refrigerant between the compressor and the refrigeration evaporator and / or the temperature-controlled evaporator. The four-way reversing valve group is configured to control the flow direction of the refrigerant between the compressor, the condenser, the refrigeration evaporator, and the temperature-controlled evaporator. The air mixing duct includes a refrigeration duct and a temperature regulating duct arranged in parallel, the refrigeration duct is provided with the refrigeration evaporator and a first air door, the temperature regulating duct is provided with the temperature regulating evaporator and a second air door, the first air door is configured to control the connection and disconnection between the refrigeration compartment and the refrigeration duct, and the second air door is configured to control the connection and disconnection between the refrigeration compartment and the temperature regulating duct.

2. A method for controlling temperature and humidity in a refrigerator, characterized in that: The refrigerator comprises a box body, and a refrigerator compartment, an air mixing duct and an air outlet duct arranged in the box body and connected to each other, the air mixing duct comprises a refrigeration duct and a temperature regulating duct arranged in parallel, a refrigeration evaporator and a first air door are arranged in the refrigeration duct, and a temperature regulating evaporator and a second air door are arranged in the temperature regulating duct, the first air door is arranged to control the connection and disconnection between the refrigerator compartment and the refrigeration duct, and the second air door is arranged to control the connection and disconnection between the refrigerator compartment and the temperature regulating duct; The control method comprises: When the refrigerator is in a cooling mode, the first air door is controlled to open and the opening angle is gradually opened to a maximum, and the refrigeration evaporator is in a cooling working state; Obtaining the outlet temperature Ta of the air mixing duct and the indoor temperature Tb of the refrigerated compartment; Comparing the outlet temperature Ta with the first preset temperature T1 and the indoor temperature Tb with the second preset temperature T2; When the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the refrigerator is controlled to enter a temperature adjustment mode.

3. The method for controlling temperature and humidity of a refrigerator according to claim 1, characterized in that: The step of "controlling the refrigerator to enter the temperature adjustment mode" specifically includes: Controlling the second air door to open, the temperature-adjusting evaporator is in a temperature-adjusting working state; Obtaining an opening angle of the second damper; When the opening angle reaches the first preset angle A1 and the continuous opening time reaches the first preset time t1, it is determined whether the outlet temperature Ta is less than the first preset temperature T1 and whether the indoor temperature Tb is greater than the second preset temperature T2; According to the judgment result, controlling the opening angle of the second damper and the working state of the temperature-adjustable evaporator; Among them, A1=K1×90°, K1 is the preset opening coefficient, and the value range of K1 is 0~1.

4. The method for controlling temperature and humidity of a refrigerator according to claim 3, characterized in that: The step of "controlling the opening angle of the second damper and the working state of the temperature-adjusting evaporator according to the judgment result" specifically includes: When the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the opening angle of the second damper is controlled to increase to a second preset angle A2; Get the actual value of A2; According to the actual value, controlling the opening angle of the second damper and the working state of the temperature-controlled evaporator; Among them, A2=(1+α)×K1×90°, α is the adjustment coefficient, K1 is the preset opening coefficient, the value range of α is 0~1, and the value range of K1 is 0~1.

5. The method for controlling temperature and humidity of a refrigerator according to claim 4, characterized in that: The step of "controlling the opening angle of the second damper and the working state of the temperature-adjusting evaporator according to the actual value" specifically includes: When A2<90°, if the outlet temperature Ta reaches the first preset temperature T1, the second damper is controlled to maintain the current opening angle, and the temperature-controlled evaporator maintains the temperature-controlled working state; and / or When A2≥90°, if the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the opening angle of the second damper is controlled to switch to the first preset angle A1 and gradually increase at the first preset angle A1, and the temperature-controlled evaporator switches to the defrosting working state.

6. The method for controlling temperature and humidity of a refrigerator according to claim 5, characterized in that: The step of "controlling the opening angle of the second damper and the working state of the temperature-controlled evaporator according to the actual value" further includes: When A2≥90° and the temperature-controlled evaporator is switched to the defrosting working state, if the outlet temperature Ta is lower than the first preset temperature T1 and the indoor temperature Tb is higher than the second preset temperature T2, the second damper is controlled to maintain the current opening angle until the indoor temperature Tb is lower than the second preset temperature T2.

7. The method for controlling temperature and humidity in a refrigerator according to any one of claims 2 to 6, characterized in that: The refrigerator also includes a compressor, a condenser, a first solenoid valve, a second solenoid valve and a four-way reversing valve group. In the refrigerant circulation loop, the first solenoid valve is configured to control the on-off of the refrigerant between the compressor and the condenser, the second solenoid valve is configured to control the on-off of the refrigerant between the compressor and the refrigeration evaporator and / or the temperature-regulating evaporator, and the four-way reversing valve group is configured to control the flow direction of the refrigerant between the compressor, the condenser, the refrigeration evaporator and the temperature-regulating evaporator; The step of "the refrigeration evaporator is in a refrigeration working state" specifically includes: The first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the four-way reversing valve group is switched so that the compressor, the condenser and the refrigeration evaporator are connected to each other to form a refrigerant circulation loop.

8. The method for controlling temperature and humidity of a refrigerator according to claim 7, characterized in that: The step of "the temperature-adjusting evaporator is in a temperature-adjusting working state" specifically includes: The first solenoid valve is controlled to open, the second solenoid valve is controlled to close, and the four-way reversing valve group is switched so that the compressor, the condenser, the temperature regulating evaporator and the refrigeration evaporator are connected to each other to form a refrigerant circulation loop.

9. The method for controlling temperature and humidity of a refrigerator according to claim 7, characterized in that: The step of "switching the temperature-adjusting evaporator to the defrosting working state" specifically includes: The first solenoid valve is controlled to be closed, the second solenoid valve is controlled to be opened, and the four-way reversing valve group is switched so that the compressor, the temperature regulating evaporator and the refrigeration evaporator are connected to each other to form a refrigerant circulation loop.

10. The method for controlling temperature and humidity of a refrigerator according to claim 7, characterized in that: The control method further comprises: Obtaining the operating time of the compressor; When the running time reaches a second preset time t2, controlling the refrigerator to switch to a defrosting mode; The step of "controlling the refrigerator to switch to the defrost mode" specifically includes: The first damper is controlled to be closed, and the first solenoid valve is controlled to be closed, the second solenoid valve is controlled to be opened, and the four-way reversing valve group is switched so that the compressor, the refrigeration evaporator and the temperature control evaporator are connected to each other to form a refrigerant circulation loop.

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