Control method of refrigeration and freezing device and refrigeration and freezing device

Abstract

The present invention relates to a control method for a refrigeration and freezing device and a refrigeration and freezing device. The refrigeration and freezing device comprises a box body and a refrigeration system. A refrigeration compartment and at least one non-refrigeration compartment are defined in the box body. The refrigeration system comprises a compressor, a condenser, a solenoid valve, a freezing capillary and a freezing evaporator which are sequentially connected in series to form a loop. At least one non-refrigeration branch is connected in parallel at both ends of the freezing capillary. Each non-refrigeration branch comprises a non-refrigeration capillary and a non-refrigeration evaporator connected in series. The control method of the present invention comprises: when the refrigeration and freezing device is in a state of refrigerating any non-refrigeration compartment, the compartment humidity in the freezing compartment is obtained; and if the compartment humidity is less than a preset minimum humidity threshold, the operating frequency of the compressor is reduced so that the evaporator temperature of the freezing evaporator is higher than the compartment temperature in the freezing compartment; if the compartment humidity is greater than or equal to the preset minimum humidity threshold, the operating frequency of the compressor is kept unchanged, and the scheme is more reasonable.

Description

Technical Field

[0001] The invention relates to refrigeration and freezing technology, and in particular to a control method for a refrigeration and freezing device and a refrigeration and freezing device. Background Art

[0002] The humidity level in a refrigeration and freezing device will affect the speed of evaporation of food ingredients, thus affecting the quality of the ingredients. When the humidity is too low, the food ingredients evaporate quickly, causing weight loss, which in turn leads to problems such as poor food storage and a short food shelf life. Therefore, moisturizing refrigeration and freezing devices has always been a crucial research topic. However, most current refrigeration and freezing devices humidify and moisturize the refrigerator compartment, and rarely pay attention to the issue of humidification and moisturizing the freezer compartment. In fact, the humidity in the freezer compartment is relatively low, and ingredients such as meat that have been stored in the freezer compartment for a long time will suffer serious moisture loss and poor storage effect, which will not only affect the taste of the ingredients, but also cause the loss of nutrients in the ingredients, affecting the user experience.

[0003] The few existing solutions for humidifying the freezer compartment all involve adding a very complex humidifying device to the refrigeration and freezing device. However, the temperature in the freezer compartment is relatively low, and the humidifying device itself is prone to frost and blockage, and the humidifying device will occupy the air duct space or the compartment space. Therefore, these existing solutions will not only increase the cost and assembly difficulty of the refrigeration and freezing device, but are also very difficult to apply in practice, so that the problem of low humidity in the freezer compartment cannot be actually solved.

[0004] In the process of studying the technical problem of how to maintain or increase the humidity in the freezer, the applicant realized that humidifying or moisturizing the freezer may affect the temperature in the freezer, as well as other parameters related to the performance of the refrigeration and freezing device, such as the refrigeration of non-freezer rooms. Therefore, it is very important to design a more reasonable solution for humidifying or moisturizing the freezer. Summary of the invention

[0005] An object of the first aspect of the present invention is to overcome at least one drawback of the prior art and to provide a control method for a refrigeration and freezing device capable of reasonably humidifying or moisturizing a freezing compartment.

[0006] A further object of the first aspect of the present invention is to improve the humidification efficiency of the refrigeration compartment.

[0007] The second aspect of the present invention aims to provide a refrigeration and freezing device capable of reasonably humidifying or moisturizing a freezing compartment.

[0008] According to a first aspect of the present invention, the present invention provides a control method for a refrigeration and freezing device, the refrigeration and freezing device comprising a box and a refrigeration system, the box defining a freezing compartment and at least one non-freezing compartment, the refrigeration system comprising a compressor, a condenser, a solenoid valve, a freezing capillary and a freezing evaporator connected in series in sequence to form a loop, at least one non-freezing branch for providing cooling to the at least one non-freezing compartment is connected in parallel at both ends of the freezing capillary, each of the non-freezing branches comprising a non-freezing capillary and a non-freezing evaporator connected in series; the control method comprises:

[0009] When the refrigeration and freezing device is in a state where any non-freezing compartment is refrigerating, obtaining the compartment humidity in the freezing compartment; and

[0010] If the compartment humidity is less than a preset minimum humidity threshold, the operating frequency of the compressor is reduced so that the evaporator temperature of the freezing evaporator is higher than the compartment temperature in the freezing compartment; if the compartment humidity is greater than or equal to the preset minimum humidity threshold, the operating frequency of the compressor is kept unchanged.

[0011] Optionally, the refrigeration and freezing device further comprises a refrigeration fan for causing the cooling airflow generated by the refrigeration evaporator to flow to the freezing compartment when the freezing compartment is refrigerated; and the control method further comprises:

[0012] If the compartment humidity is lower than the preset minimum humidity threshold, controlling the refrigeration fan to be in operation;

[0013] If the compartment humidity is greater than or equal to the preset minimum humidity threshold, the refrigeration fan is controlled to be in a stopped state.

[0014] Optionally, when the compartment humidity is lower than a preset minimum humidity threshold, the rotation speed of the refrigeration fan is lower than a set rotation speed of the refrigeration fan when the refrigeration and freezing device is in a refrigeration state of the freezer compartment.

[0015] Optionally, after reducing the operating frequency of the compressor and starting the refrigeration fan, the control method further includes:

[0016] Obtaining the compartment humidity in the freezing compartment again;

[0017] Determine whether the humidity of the compartment obtained again is greater than a preset maximum humidity threshold;

[0018] If so, the operating frequency of the compressor is kept unchanged and the refrigeration fan is stopped until the temperature in the non-refrigeration room in the refrigeration state reaches its set temperature; if not, return to continue to determine whether the humidity of the room is less than the preset minimum humidity threshold.

[0019] Optionally, the preset minimum humidity threshold is any relative humidity value between 45% and 55%; and / or

[0020] The preset maximum humidity threshold is any relative humidity value between 80% and 100%.

[0021] Optionally, the control method further includes:

[0022] When the temperature in the non-freezing compartment in the refrigeration state reaches the set temperature of the non-freezing compartment, if the compartment temperature in the freezing compartment is higher than the set temperature of the freezing compartment, the solenoid valve is controlled to switch to the state of refrigerating the freezing compartment, and the operating frequency of the compressor is restored to the preset operating frequency for refrigerating the freezing compartment.

[0023] Optionally, when the compartment humidity is less than the preset minimum humidity threshold, the operating frequency of the compressor is between the minimum operating frequency of the compressor and a set operating frequency of the compressor when the refrigeration and freezing device is in a freezing compartment refrigeration state.

[0024] Optionally, the at least one non-freezing compartment comprises a refrigerating compartment, the at least one non-freezing branch comprises a refrigerating branch, the non-freezing capillary comprises a refrigerating capillary, and the non-freezing evaporator comprises a refrigerating evaporator; and / or

[0025] The at least one non-freezing compartment comprises a variable temperature compartment, the at least one non-freezing branch comprises a variable temperature branch, the non-freezing capillary tube comprises a variable temperature capillary tube, and the non-freezing evaporator comprises a variable temperature evaporator.

[0026] According to a second aspect of the present invention, the present invention further provides a refrigeration and freezing device, comprising:

[0027] A box body, wherein a freezing compartment and at least one non-freezing compartment are defined in the box body;

[0028] A refrigeration system, comprising a compressor, a condenser, a solenoid valve, a freezing capillary tube and a freezing evaporator connected in series in sequence to form a loop, wherein both ends of the freezing capillary tube are connected in parallel with at least one non-freezing branch for providing cooling capacity to the at least one non-freezing compartment respectively, and each of the non-freezing branches comprises a non-freezing capillary tube and a non-freezing evaporator connected in series; and

[0029] A control device comprises a processor and a memory, wherein a machine executable program is stored in the memory, and when the machine executable program is executed by the processor, it is used to implement the control method according to any of the above schemes.

[0030] Optionally, the refrigeration and freezing device further comprises:

[0031] A refrigeration fan is used to cause the cooling airflow generated by the refrigeration evaporator to flow to the freezer compartment when the freezer compartment is refrigerated, and is configured to start when the compartment humidity in the freezer compartment is less than a preset minimum humidity threshold, and remain in an off state when the compartment humidity is greater than or equal to the preset minimum humidity threshold.

[0032] During the refrigeration of the non-freezing compartment, the refrigeration and freezing device of the present invention first obtains the compartment humidity in the freezing compartment, and only when the compartment humidity in the freezing compartment is less than the preset minimum humidity threshold value, the operating frequency of the compressor is reduced to increase the evaporator temperature of the freezing evaporator, so that the evaporator temperature of the freezing evaporator is higher than the compartment temperature in the freezing compartment while meeting the refrigeration demand of the non-freezing compartment. This is because the applicant recognizes that the freezing evaporator is connected in series with any non-freezing evaporator, and during the refrigeration of the non-freezing compartment, the refrigerant flows through the non-freezing evaporator and then flows through the freezing evaporator. When the refrigerant flows through the non-freezing evaporator, it absorbs external heat, so that the temperature of the refrigerant flowing out of the non-freezing evaporator is higher than the refrigerant temperature at the non-freezing evaporator. When the refrigerant after absorbing heat flows through the freezing evaporator, the temperature of the freezing evaporator may be close to or higher than the temperature in the freezing compartment. At this time, no adjustment is required to make the external water vapor entering the freezing compartment through the door seal and the moisture in the freezing compartment (such as the moisture volatilized by the food) condense in the freezing compartment with a lower temperature instead of condensing at the freezing evaporator. In this way, the moisture content in the freezer compartment is increased, thereby increasing the humidity in the freezer compartment, and the direct adjustment of the operating frequency of the compressor to affect the refrigeration of non-freezer compartments is avoided, and the solution design is more reasonable.

[0033] Furthermore, the refrigeration and freezing device further comprises a refrigeration fan for causing the cooling airflow generated by the freezing evaporator to flow to the freezing compartment when the freezing compartment is refrigerated. In the prior art, when the non-freezing compartment is refrigerated, the refrigeration fan is usually stopped. The present invention sets the refrigeration fan to operate when the compartment humidity in the freezing compartment is less than the preset minimum humidity threshold, and to stop when the compartment humidity in the freezing compartment is greater than or equal to the preset minimum humidity threshold. That is, the refrigeration fan is only started when the compartment humidity in the freezing compartment is less than the preset minimum humidity threshold, so as to cause the water vapor formed by the sublimation of part of the frost on the surface of the freezing evaporator to enter the freezing compartment with a lower temperature, so as to increase the humidification rate of the freezing compartment. When the compartment humidity in the freezing compartment is greater than or equal to the preset minimum humidity threshold, it is not necessary to adjust the compartment humidity. At this time, the refrigeration fan stops to avoid blowing the airflow with a slightly higher temperature at the freezing evaporator into the freezing compartment, which causes the temperature of the freezing compartment to rise excessively, and the scheme design is more reasonable.

[0034] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0036] Figure 1 is a schematic structural diagram of a refrigeration and freezing device according to an embodiment of the present invention;

[0037] Figure 2 is a schematic structural block diagram of a refrigeration system of a refrigeration and freezing device according to an embodiment of the present invention;

[0038] Figure 3 is a schematic flow chart of a control method for a refrigeration and freezing device according to a specific embodiment of the present invention;

[0039] Figure 4 is a schematic flow chart of a control method for a refrigeration and freezing device according to another specific embodiment of the present invention;

[0040] Figure 5 is a schematic flow chart of a control method for a refrigeration and freezing device according to another specific embodiment of the present invention;

[0041] Figure 6 is a schematic structural block diagram of a refrigeration system according to another embodiment of the present invention;

[0042] Figure 7 is a schematic structural block diagram of a refrigeration system according to yet another embodiment of the present invention;

[0043] Figure 8 The figure is a schematic structural block diagram of a refrigeration and freezing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention first provides a control method for a refrigeration and freezing device. Figure 1 is a schematic structural diagram of a refrigeration and freezing device according to an embodiment of the present invention, Figure 2 The figure is a schematic structural block diagram of a refrigeration system of a refrigeration and freezing device according to an embodiment of the present invention.

[0045] See also Figure 1 and Figure 2The refrigerator-freezer 1 includes a housing 10 and a refrigeration system 20. The housing 10 defines a freezer compartment 11 and at least one non-freezer compartment. It is understood that the freezer compartment 11 is a storage compartment used for freezing, and the non-freezer compartment is a storage compartment used for non-freezers. For example, the non-freezer compartment may be a storage compartment used for refrigeration or temperature change. Generally, the temperature in the non-freezer compartment is higher than the temperature in the freezer compartment 11.

[0046] The refrigeration system 20 includes a compressor 21, a condenser 22, a solenoid valve 23, a freezing capillary tube 24 and a freezing evaporator 25 which are sequentially connected in series to form a loop. Both ends of the freezing capillary tube 24 are connected in parallel with at least one non-freezing branch for providing cooling to the at least one non-freezing compartment, and each non-freezing branch includes a non-freezing capillary tube and a non-freezing evaporator connected in series. It should be noted that the series connection and parallel connection mentioned in the present invention refer to the physical series connection and parallel connection of the refrigerant flow path, rather than the series connection and parallel connection of the circuit structure.

[0047] When the refrigeration and freezing device 1 is in the state of refrigerating the non-freezing compartment, the state of the solenoid valve 23 is set to connect the condenser 22 and the non-freezing branch corresponding to the non-freezing compartment. At this time, the refrigerant flowing out of the compressor 21 passes through the condenser 22, the solenoid valve 23, the non-freezing evaporator and the non-freezing capillary of the non-freezing branch, and the freezing evaporator 25 in sequence, and finally returns to the compressor 21. When the refrigeration and freezing device 1 is in the state of refrigerating the freezing compartment, the state of the solenoid valve 23 is set to connect the condenser 22 and the freezing capillary 24. At this time, the refrigerant flowing out of the compressor 21 passes through the condenser 22, the solenoid valve 23, the freezing capillary 24 and the freezing evaporator 25 in sequence, and finally returns to the compressor 21.

[0048] The applicant recognizes that the freezing compartment 11 is not an absolutely closed compartment. The air carrying moisture from the outside will enter the freezing compartment 11 through the door seal of the freezing compartment 11; the unfrozen food inside the freezing compartment 11 will volatilize a certain amount of moisture; after the food in the freezing compartment 11 is frozen, a small amount of moisture on the surface of the food will sublimate; and a small amount of frost formed on the surface of the freezing evaporator 25 will also sublimate. In other words, the refrigeration and freezing device 1 originally has a variety of moisture sources that can be used to moisturize or humidify the freezing compartment 11. If this moisture can be effectively used to moisturize or humidify the freezing compartment 11, then there is no need to set up any other humidifying device.

[0049] The applicant further recognizes that, for an air-cooled refrigeration and freezing device 1, frost rarely forms in the storage compartment, and frost forms basically on the evaporator. This is because the temperature of the evaporator is generally lower than the temperature of the storage compartment. In other words, water vapor usually gathers and condenses at a location with a lower temperature. Then, if the compartment temperature in the freezing compartment 11 is lower than the evaporator temperature at the freezing evaporator 25, water vapor will gather in the freezing compartment 11, and the freezing compartment 11 can be effectively moisturized or the humidity in the freezing compartment can be increased.

[0050] To this end, the present invention particularly proposes a control method for a refrigeration and freezing device, the control method comprising:

[0051] When the refrigeration and freezing device 1 is in a state where any non-freezing compartment is refrigerating, obtaining the compartment humidity in the freezing compartment 11; and

[0052] If the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity threshold, the operating frequency of the compressor 21 is reduced so that the evaporator temperature of the freezing evaporator 25 is higher than the compartment temperature in the freezing compartment 11; if the compartment humidity in the freezing compartment 11 is greater than or equal to the above-mentioned preset minimum humidity threshold, the operating frequency of the compressor 21 is kept unchanged.

[0053] During the refrigeration of the non-freezing compartment, the refrigerating and freezing device 1 of the present invention first obtains the compartment humidity in the freezing compartment 11, and only when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity threshold value, the operating frequency of the compressor 21 is reduced to increase the evaporator temperature of the freezing evaporator 25, so that the evaporator temperature of the freezing evaporator 25 is higher than the compartment temperature in the freezing compartment 11 while meeting the refrigeration demand of the non-freezing compartment. This is because the applicant recognizes that the freezing evaporator 25 is connected in series with any non-freezing evaporator, and during the refrigeration of the non-freezing compartment, the refrigerant flows through the non-freezing evaporator and then flows through the freezing evaporator 25. When the refrigerant flows through the non-freezing evaporator, it absorbs external heat, so that the temperature of the refrigerant flowing out of the non-freezing evaporator is higher than the temperature of the refrigerant at the non-freezing evaporator. When the refrigerant after absorbing heat flows through the freezing evaporator, the temperature of the freezing evaporator 25 may be close to or higher than the temperature in the freezing compartment 11. At this time, no adjustment is required to make the external water vapor entering the freezing compartment through the door seal and the moisture in the freezing compartment (such as moisture volatilized by food, moisture sublimated on the surface of frozen food, etc.) condense in the freezing compartment 11 with a lower temperature instead of condensing at the freezing evaporator 25. In this way, the moisture content in the freezing compartment 11 is increased, thereby increasing the humidity in the freezing compartment 11, and avoiding directly adjusting the operating frequency of the compressor 21 to affect the refrigeration of non-freezing compartments, and the solution design is more reasonable.

[0054] Moreover, the present invention realizes the effect of humidifying and moisturizing the freezing chamber 11 by controlling the operating frequency of the compressor 21 on the basis of the original structure of the refrigerating and freezing device 1, and does not need to add any auxiliary structure. Therefore, it will not have any impact on the original structure and storage capacity of the refrigerating and freezing device 1, and is convenient for practical application. The scheme of the present invention for realizing humidifying and moisturizing the freezing chamber 11 is completely different from the scheme adopted in the prior art, the design idea is very novel, the effect is significant, and the prospect of practical application is good.

[0055] Figure 3 is a schematic flow chart of a control method for a refrigeration and freezing device according to a specific embodiment of the present invention, see Figure 3 , the control method of the present invention comprises:

[0056] Step S10, obtaining the current state of the refrigeration and freezing device 1;

[0057] Step S20, determining whether the refrigeration and freezing device 1 is in a non-freezing compartment refrigeration state; if so, proceeding to step S30, if not, returning to step S10; and

[0058] Step S30, obtaining the compartment humidity in the freezing compartment 11;

[0059] Step S40, determining whether the humidity in the freezing compartment 11 is less than a preset minimum humidity threshold, if so, proceeding to step S50, if not, proceeding to step S60;

[0060] Step S50, reducing the operating frequency of the compressor 21 so that the evaporator temperature of the freezing evaporator 25 is higher than the compartment temperature in the freezing compartment 11;

[0061] Step S60, maintaining the operating frequency of the compressor 21 unchanged.

[0062] In some embodiments, the refrigeration and freezing device 1 further comprises a refrigeration fan 30 for causing the cooling airflow generated by the freezing evaporator 25 to flow to the freezing compartment 11 when the freezing compartment 11 is refrigerated. In these embodiments, the control method of the present invention further comprises:

[0063] If the humidity in the freezing compartment 11 is lower than the above-mentioned preset minimum humidity threshold, the freezing fan 30 is controlled to be in operation; and

[0064] If the compartment humidity in the freezing compartment 11 is greater than or equal to the above-mentioned preset minimum humidity threshold, the freezing fan 30 is controlled to be in a stopped state.

[0065] In the prior art, when the non-freezer compartment is refrigerated, the refrigeration fan 30 is usually stopped. In the present invention, the refrigeration fan 30 is set to run when the compartment humidity in the freezer compartment 11 is less than the preset minimum humidity threshold, and to stop when the compartment humidity in the freezer compartment 11 is greater than or equal to the preset minimum humidity threshold. That is, the refrigeration fan 30 is started only when the compartment humidity in the freezer compartment 11 is less than the preset minimum humidity threshold, so as to promote the water vapor formed by the sublimation of part of the frost on the surface of the freezing evaporator 25 to enter the freezer compartment 11 with a lower temperature, so as to increase the humidification rate of the freezer compartment 11. That is to say, the moisture content in the freezer compartment 11 can be increased from multiple aspects at the same time, thereby efficiently increasing the humidity in the freezer compartment 11.

[0066] Figure 4 is a schematic flow chart of a control method for a refrigeration and freezing device according to another specific embodiment of the present invention, see Figure 4 , the control method of the present invention comprises:

[0067] Step S10, obtaining the current state of the refrigeration and freezing device 1;

[0068] Step S20, determining whether the refrigeration and freezing device 1 is in a non-freezing compartment refrigeration state; if so, proceeding to step S30, if not, returning to step S10; and

[0069] Step S30, obtaining the compartment humidity in the freezing compartment 11;

[0070] Step S40, determining whether the humidity in the freezing compartment 11 is less than a preset minimum humidity threshold, if so, proceeding to step S50', if not, proceeding to step S60';

[0071] Step S50', reducing the operating frequency of the compressor 21 so that the evaporator temperature of the freezing evaporator 25 is higher than the compartment temperature in the freezing compartment 11, and controlling the freezing fan 30 to be in an operating state;

[0072] Step S60', maintaining the operating frequency of the compressor 21 unchanged, and controlling the refrigeration fan 30 to be in a stopped state.

[0073] It is understandable that, in step S50 ′, the operating frequency of the compressor 21 may be reduced first and then the refrigeration fan 30 may be controlled to operate, or the operating frequency of the compressor 21 may be reduced and at the same time the refrigeration fan 30 may be controlled to operate.

[0074] Figure 5 is a schematic flow chart of a control method for a refrigeration and freezing device according to another specific embodiment of the present invention, see Figure 5 After reducing the operating frequency of the compressor 21 and starting the refrigeration fan 30, the control method of the present invention further includes:

[0075] Step S70, obtaining the compartment humidity in the freezing compartment 11 again;

[0076] Step S80, determining whether the compartment humidity in the freezing compartment 11 obtained again is greater than the preset maximum humidity threshold; if so, proceeding to step S90; if not, returning to step S40 to continue determining whether the compartment humidity in the freezing compartment 11 obtained again is less than the preset minimum humidity threshold;

[0077] Step S90, the operating frequency of the compressor 21 is kept unchanged, and the refrigeration fan 30 is stopped until the temperature in the non-refrigeration room in the refrigeration state reaches its set temperature.

[0078] That is, during the refrigeration of the non-freezing compartment, when the compartment humidity in the freezing compartment 11 is greater than the preset maximum humidity threshold and the freezing fan 30 is stopped, the freezing fan 30 is no longer started, and the operating frequency of the compressor is no longer changed. When the temperature in the non-freezing compartment in the refrigeration state reaches its set temperature, if the freezing compartment 11 needs to be refrigerated, the freezing fan 30 is started again. When the temperature in the non-freezing compartment in the refrigeration state reaches its set temperature, the operating frequency of the compressor 21 can be flexibly adjusted according to the state of the refrigeration and freezing device 1. For example, when no compartment needs to be refrigerated, the compressor 21 stops running; when any compartment needs to be refrigerated, the compressor 21 runs at a preset operating frequency.

[0079] After the operating frequency of the compressor 21 is reduced and the refrigeration fan 30 is operated, the humidity in the freezing compartment 11 gradually increases. When the compartment humidity in the freezing compartment 11 is greater than or equal to the preset minimum humidity threshold, the compartment humidity in the freezing compartment 11 is already suitable for the high-quality preservation of food, and there is no need to quickly humidify the freezing compartment 11. At this time, stopping the refrigeration fan 30 can avoid the airflow with a slightly higher temperature at the freezing evaporator 25 from continuing to be blown into the freezing compartment 11, causing the temperature of the freezing compartment 11 to rise excessively. It can be seen that the design of the scheme of the present invention is more reasonable.

[0080] Furthermore, when the compartment humidity in the freezing compartment 11 is greater than or equal to the preset minimum humidity threshold, the operating frequency of the compressor 21 remains unchanged, that is, the compressor 21 still operates at the reduced operating frequency to ensure that the evaporator temperature of the freezing evaporator 25 is higher than the compartment temperature in the freezing compartment 11. At this time, the external water vapor entering the freezing compartment 11 through the door seal and the moisture in the freezing compartment 11 will still condense in the freezing compartment 11 with a lower temperature, and the humidity in the freezing compartment 11 will slowly increase or be continuously maintained, ensuring that the freezing compartment 11 always has a high humidity, thereby improving the preservation effect of the food.

[0081] In some embodiments, the preset maximum humidity threshold can be any relative humidity value between 80% and 100%. For example, the preset maximum humidity threshold can be 80%, 85%, 90%, 95% or 100%. Within this range, the humidity in the freezing compartment 11 is not yet saturated, close to saturation or just saturated, the water vapor in the freezing compartment 11 will not or is not easy to condense, the moisturizing effect or humidification effect is better, and the preservation effect of the food is better. At this time, there is no need to continue to humidify the freezing compartment 11 efficiently. Therefore, stopping the refrigeration fan 30 at this time can reduce the impact on the temperature in the freezing compartment 11 by slowing down the speed of the humidity increase in the freezing compartment 11, which neither affects the preservation effect of the food in the freezing compartment 11 nor has a significant impact on the freezing effect in the freezing compartment 11.

[0082] If the preset maximum humidity threshold is too large, the refrigeration fan 30 will continue to run, which will not only fail to improve the moisturizing effect or humidification effect, but also seriously affect the temperature in the freezing compartment 11. If the preset maximum humidity threshold is too small, the refrigeration fan 30 will be stopped when the humidity in the freezing compartment 11 does not meet the demand, resulting in low humidification efficiency of the freezing compartment 11.

[0083] In some embodiments, the preset minimum humidity threshold is any relative humidity value between 45% and 55%. For example, the preset minimum humidity threshold may be 45%, 47%, 50%, 53% or 55%. Within this range, the humidity in the freezing compartment 11 is not yet saturated, but it barely affects the quality of the food. If the preset minimum humidity threshold is too large, the compressor 21 can easily reach the condition of reducing the operating frequency, resulting in the compressor 21 running at a normal frequency for too short a time, thereby seriously reducing the refrigeration efficiency of the non-freezing compartment 11. If the preset minimum humidity threshold is too small, the condition of reducing the operating frequency of the compressor 21 may not be met when the compartment humidity in the freezing compartment 11 is very low, resulting in the inability to perform substantial, long-term moisturizing and humidifying operations on the freezing compartment 11.

[0084] In some embodiments, the control method of the present invention further includes:

[0085] When the temperature in the non-freezer compartment in the refrigeration state reaches the set temperature of the non-freezer compartment, if the compartment temperature in the freezer compartment 11 is higher than the set temperature of the freezer compartment 11, the solenoid valve 23 is controlled to switch to the state of refrigerating the freezer compartment 11, and the operating frequency of the compressor 21 is restored to the preset operating frequency for refrigerating the freezer compartment 11, so that the freezer compartment 11 reaches the set temperature faster.

[0086] Since the purpose of the operation of the refrigeration fan 30 during the non-refrigeration compartment refrigeration period is to promote the water vapor formed by the sublimation of part of the frost on the refrigeration evaporator 25 to enter the freezing compartment 11 faster, rather than to transport air flow to the freezing compartment 11, the rotation speed of the refrigeration fan 30 does not need to be large.

[0087] To this end, in some embodiments, when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity threshold, the rotation speed of the freezing fan 30 is less than the set rotation speed of the freezing fan 30 when the refrigeration and freezing device 1 is in the freezing compartment refrigeration state. In this way, the water vapor formed by the sublimation of part of the frost on the freezing evaporator 25 can be sent to the freezing compartment 11 more quickly, and too much relatively high temperature airflow can be prevented from entering the freezing compartment 11, causing the temperature in the freezing compartment 11 to rise more and affecting the freezing effect of the freezing compartment 11.

[0088] During the refrigeration of the non-refrigerated compartment, the refrigeration demand of the non-refrigerated compartment needs to be met. Therefore, the operating frequency of the compressor 21 cannot be too low.

[0089] In some embodiments, when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity threshold, the operating frequency of the compressor 21 is between the minimum operating frequency of the compressor 21 and the set operating frequency of the compressor 21 when the refrigeration and freezing device 1 is in the freezing compartment refrigeration state. In this way, the refrigeration demand of the non-freezing compartment can be met, and the evaporator temperature of the freezing evaporator 25 can be appropriately higher than the compartment temperature in the freezing compartment 11, thereby achieving the purpose of moisturizing or humidifying the freezing compartment 11.

[0090] In some embodiments, when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity threshold, the operating frequency of the compressor 21 is 3 to 17 Hz lower than the set operating frequency of the compressor 21 when the refrigeration and freezing device 1 is in the freezing compartment refrigeration state. In other words, as long as the operating frequency of the compressor 21 is appropriately reduced so that the evaporator temperature of the freezing evaporator 25 is slightly higher than the temperature in the freezing compartment 11, the refrigeration efficiency and refrigeration effect of the non-freezing compartment are maximized, and the temperature in the freezing compartment 11 is prevented from rising too much as much as possible.

[0091] For example, when the compartment humidity in the freezing compartment 11 is less than a preset minimum humidity threshold, the operating frequency of the compressor 21 may be 3 Hz, 5 Hz, 7 Hz, 9 Hz, 11 Hz, 13 Hz, 15 Hz or 17 Hz lower than the operating frequency of the compressor 21 during refrigeration of the freezing compartment.

[0092] Preferably, when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity threshold, the operating frequency of the compressor 21 is 8 to 12 Hz lower than the above-mentioned set operating frequency of the compressor 21. Thus, the refrigeration efficiency and refrigeration effect of the non-freezing compartment and the moisturizing and humidifying effect in the freezing compartment 11 are better.

[0093] In some embodiments, the at least one non-freezing compartment may include a refrigerating compartment 12, the at least one non-freezing branch may include a refrigerating branch 201, the non-freezing capillary may include a refrigerating capillary 26, and the non-freezing evaporator may include a refrigerating evaporator 27. During the refrigerating period of the refrigerating compartment 12, the freezing compartment 11 is moisturized or humidified by reducing the operating frequency of the compressor 21.

[0094] Figure 6 is a schematic structural block diagram of a refrigeration system according to another embodiment of the present invention. In other embodiments, the at least one non-freezing compartment may include a variable temperature compartment 13, the at least one non-freezing branch may include a variable temperature branch 202, the non-freezing capillary may include a variable temperature capillary 28, and the non-freezing evaporator may include a variable temperature evaporator 29. During the refrigeration of the variable temperature compartment 13, the freezing compartment 11 is moisturized or humidified by reducing the operating frequency of the compressor 21.

[0095] Figure 7 is a schematic structural block diagram of a refrigeration system according to another embodiment of the present invention. In some other embodiments, the number of non-freezing compartments may be two, namely, a refrigerating compartment 12 and a variable temperature compartment 13. The number of non-freezing branches is two, namely, a refrigerating branch 201 and a variable temperature branch 202. The number of non-freezing capillaries is two, namely, a refrigerating capillary 26 and a variable temperature capillary 28. The number of non-freezing evaporators is two, namely, a refrigerating evaporator 27 and a variable temperature evaporator 29. During the refrigeration of any of the refrigerating compartments 12 and the variable temperature compartment 13, the freezing compartment 11 is moisturized or humidified by reducing the operating frequency of the compressor 21.

[0096] The present invention also provides a refrigeration and freezing device. Figure 8 is a schematic structural block diagram of a refrigeration and freezing device according to an embodiment of the present invention. Figure 1 , Figure 2 and Figure 8 The refrigeration and freezing device 1 of the present invention includes a cabinet 10, a refrigeration system 20 and a control device 40.

[0097] The housing 10 defines a freezing compartment 11 and at least one non-freezing compartment.

[0098] The refrigeration system 20 includes a compressor 21, a condenser 22, a solenoid valve 23, a freezing capillary tube 24 and a freezing evaporator 25 which are connected in series to form a loop. Both ends of the freezing capillary tube 24 are connected in parallel with at least one non-freezing branch for providing cooling to the at least one non-freezing compartment respectively. Each non-freezing branch includes a non-freezing capillary tube and a non-freezing evaporator connected in series.

[0099] The control device 40 includes a processor 41 and a memory 42 . The memory 42 stores a machine executable program 43 . When the machine executable program 43 is executed by the processor 41 , it is used to implement the control method described in any of the above embodiments.

[0100] The refrigeration and freezing device 1 of the present invention reduces the operating frequency of the compressor 21 only when the compartment humidity in the freezing compartment 11 is less than a preset minimum humidity threshold value, which not only increases the moisture content in the freezing compartment 11 and thus increases the humidity in the freezing compartment 11, but also avoids directly adjusting the operating frequency of the compressor 21 to affect the refrigeration of non-freezing compartments, and the design scheme is more reasonable.

[0101] Specifically, the processor 41 can be a central processing unit (CPU), or a digital processing unit, etc. The processor 41 sends and receives data through a communication interface. The memory 44 is used to store the program executed by the processor 41. The memory 44 is any medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, and can also be a combination of multiple memories. The above-mentioned machine executable program 43 can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or an external storage device via a network (such as the Internet, a local area network, a wide area network and / or a wireless network).

[0102] In some embodiments, the refrigeration and freezing device 1 further includes a refrigeration fan 30. The refrigeration fan 30 is used to cause the cooling airflow generated by the refrigeration evaporator 25 to flow to the freezing compartment 11 when the freezing compartment 11 is refrigerated, and is configured to start when the compartment humidity in the freezing compartment 11 is less than a preset minimum humidity threshold, and remain in a closed state when the compartment humidity in the freezing compartment 11 is greater than or equal to the preset minimum humidity threshold. As a result, when the compartment humidity in the freezing compartment 11 is low, the refrigeration fan 30 can be used to cause the moisture at the refrigeration evaporator 25 to enter the freezing compartment 11 faster, thereby improving the humidification efficiency of the freezing compartment 11.

[0103] Specifically, the refrigeration fan 30 is electrically connected to the control device 40 to operate under the control of the control device 40 .

[0104] Those skilled in the art should understand that the refrigeration and freezing device 1 of the present invention includes not only a refrigerator, but also a freezer, a freezer or other refrigeration and freezing devices with at least a freezing function.

[0105] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A control method for a refrigeration and freezing device, the refrigeration and freezing device comprising a box and a refrigeration system, wherein a freezing compartment and at least one non-freezing compartment are defined in the box, the refrigeration system comprises a compressor, a condenser, a solenoid valve, a freezing capillary tube and a freezing evaporator which are sequentially connected in series to form a loop, at least one non-freezing branch for providing cooling to the at least one non-freezing compartment is connected in parallel at both ends of the freezing capillary tube, each of the non-freezing branches comprises a non-freezing capillary tube and a non-freezing evaporator connected in series; the control method comprises: When the refrigeration and freezing device is in a state where any non-freezing compartment is refrigerating, obtaining the compartment humidity in the freezing compartment; as well as If the compartment humidity is less than a preset minimum humidity threshold, the operating frequency of the compressor is reduced so that the evaporator temperature of the freezing evaporator is higher than the compartment temperature in the freezing compartment; if the compartment humidity is greater than or equal to the preset minimum humidity threshold, the operating frequency of the compressor is kept unchanged.

2. The control method according to claim 1, wherein the refrigeration and freezing device further comprises a refrigeration fan for causing the cooling airflow generated by the refrigeration evaporator to flow to the freezing compartment when the freezing compartment is refrigerated; and the control method further comprises: If the compartment humidity is lower than the preset minimum humidity threshold, controlling the refrigeration fan to be in operation; If the compartment humidity is greater than or equal to the preset minimum humidity threshold, the refrigeration fan is controlled to be in a stopped state.

3. The control method according to claim 2, wherein When the compartment humidity is lower than a preset minimum humidity threshold, the rotation speed of the refrigeration fan is lower than a set rotation speed of the refrigeration fan when the refrigeration and freezing device is in a refrigeration state of the freezing compartment.

4. The control method according to claim 2, after reducing the operating frequency of the compressor and starting the refrigeration fan, the control method further comprises: Obtaining the compartment humidity in the freezing compartment again; Determine whether the humidity of the compartment obtained again is greater than a preset maximum humidity threshold; If so, the operating frequency of the compressor is kept unchanged and the refrigeration fan is stopped until the temperature in the non-refrigeration room in the refrigeration state reaches its set temperature; if not, return to continue to determine whether the humidity of the room is less than the preset minimum humidity threshold.

5. The control method according to claim 4, wherein The preset minimum humidity threshold is any relative humidity value between 45% and 55%; and / or The preset maximum humidity threshold is any relative humidity value between 80% and 100%.

6. The control method according to claim 1, further comprising: When the temperature in the non-freezing compartment in the refrigeration state reaches the set temperature of the non-freezing compartment, if the compartment temperature in the freezing compartment is higher than the set temperature of the freezing compartment, the solenoid valve is controlled to switch to the state of refrigerating the freezing compartment, and the operating frequency of the compressor is restored to the preset operating frequency for refrigerating the freezing compartment.

7. The control method according to claim 1, wherein When the compartment humidity is less than the preset minimum humidity threshold, the operating frequency of the compressor is between the minimum operating frequency of the compressor and the set operating frequency of the compressor when the refrigeration and freezing device is in a freezing compartment refrigeration state.

8. The control method according to claim 1, wherein The at least one non-freezing compartment comprises a refrigerating compartment, the at least one non-freezing branch comprises a refrigerating branch, the non-freezing capillary tube comprises a refrigerating capillary tube, and the non-freezing evaporator comprises a refrigerating evaporator; and / or The at least one non-freezing compartment comprises a variable temperature compartment, the at least one non-freezing branch comprises a variable temperature branch, the non-freezing capillary tube comprises a variable temperature capillary tube, and the non-freezing evaporator comprises a variable temperature evaporator.

9. A refrigeration and freezing device, comprising: A box body, wherein a freezing compartment and at least one non-freezing compartment are defined in the box body; A refrigeration system, comprising a compressor, a condenser, a solenoid valve, a freezing capillary tube and a freezing evaporator connected in series in sequence to form a loop, wherein both ends of the freezing capillary tube are connected in parallel with at least one non-freezing branch for providing cooling capacity to the at least one non-freezing compartment respectively, and each of the non-freezing branches comprises a non-freezing capillary tube and a non-freezing evaporator connected in series; and A control device comprises a processor and a memory, wherein a machine executable program is stored in the memory, and when the machine executable program is executed by the processor, it is used to implement the control method according to any one of claims 1 to 8.

10. The refrigerator-freezer according to claim 9, further comprising: A refrigeration fan is used to cause the cooling airflow generated by the refrigeration evaporator to flow to the freezer compartment when the freezer compartment is refrigerated, and is configured to start when the compartment humidity in the freezer compartment is less than a preset minimum humidity threshold, and remain in an off state when the compartment humidity is greater than or equal to the preset minimum humidity threshold.

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