CN116499172A - Refrigerating and freezing device and control method thereof - Google Patents

Abstract

The invention relates to a refrigerating and freezing device and a control method thereof, wherein the refrigerating and freezing device comprises a box body and a compression refrigerating system, a freezing compartment and at least one non-freezing compartment are defined in the box body, the compression refrigerating system comprises a freezing throttling device and a freezing evaporator, at least one non-freezing branch is connected in parallel at two ends of the freezing throttling device, two ends of the freezing evaporator are connected in parallel with bypass pipelines, the compression refrigerating system further comprises a first switching valve for conducting one of the freezing evaporator and the bypass pipelines, and an auxiliary heating device is arranged at the freezing evaporator. The control method of the invention comprises the following steps: acquiring the chamber humidity in the freezing chamber in any non-freezing chamber refrigerating state; when the chamber humidity in the freezing chamber is smaller than the preset minimum humidity, the first switching valve is switched to a second state of conducting the bypass pipeline to prevent the refrigerant from flowing through the freezing evaporator, and the auxiliary heating device is started to raise the evaporator temperature of the freezing evaporator to be higher than the chamber temperature of the freezing chamber.

Description

Refrigerating and freezing device and control method thereof

Technical Field

The present invention relates to a refrigeration technology, and more particularly, to a refrigeration and freezing apparatus and a control method thereof.

Background

The humidity in the refrigerating and freezing device can influence the evaporation speed of the water in the food materials, thereby influencing the quality of the food materials. When the humidity is too low, the water of the food material evaporates faster, which causes weight loss of the food material, and then causes the problems of poor food storage effect, shorter food preservation period and the like. Therefore, it is always a critical research topic to keep the refrigerating and freezing apparatus wet. However, most of the conventional refrigerating and freezing apparatuses humidify and moisturize the refrigerating chamber, and there is little concern about humidification and moisturization of the freezing chamber. In fact, the humidity of the freezing chamber is small, the moisture loss of food materials such as meat stored in the freezing chamber for a long time is serious, the storage effect is poor, the taste of the food materials can be affected, and the loss of nutrition of the food materials can be caused to affect the user experience.

Some prior art approaches to humidification of the freezer compartment have included very complex humidification devices within the refrigeration freezer. However, the temperature of the freezing chamber is low, the humidifying device is easy to generate frost and is blocked, and the humidifying device occupies the space of the air channel or the space of the room. Therefore, the existing schemes not only increase the cost and assembly difficulty of the refrigerating and freezing device, but also are very difficult to be practically applied, so that the problem of low humidity of the freezing chamber cannot be practically solved.

Disclosure of Invention

An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the prior art and to provide a control method of a refrigerating and freezing apparatus capable of moisturizing or humidifying a freezing compartment with low energy consumption without affecting the refrigeration of a non-freezing compartment.

It is a further object of the first aspect of the present invention to further reduce the energy consumption of a refrigeration chiller.

It is an object of a second aspect of the present invention to provide a refrigerating and freezing apparatus capable of moisturizing or humidifying a freezing compartment with low energy consumption without affecting the refrigeration of a non-freezing compartment.

According to a first aspect of the present invention, there is provided a control method of a refrigeration and freezing apparatus, the refrigeration and freezing apparatus including a case and a compression refrigeration system, a freezing compartment and at least one non-freezing compartment being defined in the case, the compression refrigeration system including a freezing throttling device and a freezing evaporator for providing cold to the freezing compartment, at least one non-freezing branch for providing cold to the at least one non-freezing compartment being connected in parallel to both ends of the freezing throttling device, a bypass line being connected in parallel to both ends of the freezing evaporator, the compression refrigeration system further including a first switching valve for conducting one of the freezing evaporator and the bypass line, an auxiliary heating device being provided at the freezing evaporator for providing heat to the freezing evaporator; the control method comprises the following steps:

when the refrigeration and freezing device is in any refrigeration state of a non-refrigeration compartment, obtaining the compartment humidity in the refrigeration compartment; in a refrigeration state of the non-refrigeration compartment, the first switching valve is in a first state of conducting the refrigeration evaporator; and

when the chamber humidity in the freezing chamber is smaller than the preset minimum humidity, the first switching valve is switched to a second state of conducting the bypass pipeline to prevent the refrigerant from flowing through the freezing evaporator, and the auxiliary heating device is started to raise the evaporator temperature of the freezing evaporator to be higher than the chamber temperature of the freezing chamber.

Optionally, the refrigeration and freezing device further comprises a freezing blower for driving air supply to the freezing compartment; and the control method further comprises:

when the temperature difference between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room reaches a preset minimum temperature difference, the auxiliary heating device is turned off, and the freezing blower is started to promote the air flow to circulate between the freezing evaporator and the freezing room; wherein the method comprises the steps of

The preset minimum temperature difference is greater than zero.

Optionally, after the cooling fan is started, the control method further includes:

acquiring the chamber humidity in the freezing chamber again; and

and stopping the refrigerating fan and restoring the first switching valve to a first state of conducting the refrigerating evaporator to allow the refrigerant to flow through the refrigerating evaporator if the acquired room humidity in the refrigerating room reaches the preset maximum humidity.

Optionally, the preset minimum humidity is any relative humidity value ranging from 60% to 70%; and/or

The preset maximum humidity is any relative humidity value ranging from 80% to 100%.

Optionally, the compression refrigeration system further comprises a second switching valve for switching on one of the refrigeration restriction and the at least one non-refrigeration branch; and is also provided with

When the room humidity in the freezing room is greater than or equal to the preset minimum humidity, the control method further comprises:

and keeping the running state of the refrigeration and freezing device unchanged until the non-freezing compartment in the refrigerating state reaches the set temperature, and switching to the refrigerating state of other non-freezing compartments or the refrigerating state of the freezing compartment through the second switching valve.

Optionally, the refrigeration and freezing device further comprises a defrosting heating device for defrosting the freezing evaporator; wherein the method comprises the steps of

The heating power of the auxiliary heating device is set to be smaller than the heating power of the defrosting heating device during defrosting.

Optionally, the auxiliary heating device is abutted against the heat exchange tube wall of the freezing evaporator.

Optionally, the preset minimum temperature difference is any temperature difference in the range of 1-5 ℃.

Optionally, the at least one non-freezing compartment comprises a refrigerated compartment, the at least one non-freezing leg comprises a refrigerated leg comprising a refrigerated throttle and a refrigerated evaporator connected in series; and/or

The at least one non-freezing compartment comprises a temperature change compartment, the at least one non-freezing leg comprises a temperature change leg comprising a temperature change throttling device and a temperature change evaporator connected in series.

According to a second aspect of the present invention, there is also provided a refrigeration and freezer comprising:

a housing defining a refrigerated compartment and at least one non-refrigerated compartment therein;

the compression refrigeration system comprises a refrigeration throttling device and a refrigeration evaporator, wherein the refrigeration throttling device is used for providing cold energy for the refrigeration compartment, two ends of the refrigeration throttling device are connected in parallel with at least one non-refrigeration branch for providing cold energy for the at least one non-refrigeration compartment respectively, two ends of the refrigeration evaporator are connected in parallel with a bypass pipeline, and the compression refrigeration system further comprises a first switching valve used for conducting one of the refrigeration evaporator and the bypass pipeline;

the auxiliary heating device is arranged at the freezing evaporator and is used for providing heat for the freezing evaporator; and

the control device comprises a processor and a memory, wherein a machine executable program is stored in the memory, and the machine executable program is used for realizing the control method according to any scheme when being executed by the processor.

The refrigerating and freezing device is characterized in that an auxiliary heating device is arranged for the freezing evaporator, and two ends of the freezing evaporator are connected with a bypass pipeline in parallel. During the refrigeration of the non-refrigeration compartment, the compartment humidity in the refrigeration compartment is firstly obtained, when the compartment humidity in the refrigeration compartment is smaller than the preset minimum humidity, the refrigerant flow path is switched to the bypass pipeline through the first switching valve so as to prevent the refrigerant from continuously flowing through the refrigeration evaporator, and the auxiliary heating device is started. At this time, no refrigerant flows through the freezing evaporator, the refrigerant does not transfer cold to the freezing evaporator, and the auxiliary heating device only needs to heat for a short time with lower power to increase the evaporator temperature of the freezing evaporator to be at least higher than the compartment temperature of the freezing compartment. Thus, the outside water vapor entering the freezing chamber through the door seal and the moisture (such as the moisture volatilized by the food) in the freezing chamber can be condensed in the freezing chamber with lower temperature instead of being condensed at the freezing evaporator, so that the moisture content in the freezing chamber is effectively maintained or increased, and the humidity in the freezing chamber is maintained or increased. Meanwhile, the invention reduces the energy consumed by the auxiliary heating device as much as possible, and reduces the energy consumption increase of the refrigeration and freezing device caused by the moisturizing or humidifying operation of the freezing compartment. In addition, the invention does not need to adjust the operation frequency of the compressor, thereby not influencing the refrigeration efficiency of the non-refrigeration compartment which is in refrigeration, and the scheme design is more reasonable.

Further, due to the provision of the bypass line, the refrigerant flow path can be made to flow through the bypass line during humidification of the freezer compartment, without flowing through the freezer evaporator, i.e. the refrigerant does not absorb heat from the freezer evaporator. Therefore, when the temperature difference between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room reaches the preset minimum temperature difference, the auxiliary heating device is turned off, on one hand, the evaporator temperature of the freezing evaporator cannot be reduced due to the turning off of the auxiliary heating device, the evaporator temperature of the freezing evaporator is ensured to be continuously higher than the room temperature of the freezing room, and the moisturizing or humidifying effect of the freezing room is ensured; on the other hand, the auxiliary heating device is stopped timely, so that the consumed energy can be reduced to the maximum extent, and the energy consumption of the refrigerating and freezing device is further reduced.

The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic block diagram of a refrigeration and freezer according to one embodiment of the invention;

FIG. 2 is a schematic block diagram of a compression refrigeration system of a refrigeration chiller according to one embodiment of the present invention;

FIG. 3 is a schematic flow chart of a method of controlling a refrigeration and freezer according to one specific embodiment of the invention;

FIG. 4 is a schematic flow chart of a method of controlling a refrigeration and freezer according to another embodiment of the invention;

fig. 5 is a schematic flow chart of a control method of a refrigerating and freezing apparatus according to still another embodiment of the present invention;

fig. 6 is a schematic block diagram of a refrigerating and freezing apparatus according to an embodiment of the present invention.

Detailed Description

The present invention first provides a control method of a refrigerating and freezing apparatus, fig. 1 is a schematic structural diagram of the refrigerating and freezing apparatus according to an embodiment of the present invention, and fig. 2 is a schematic structural block diagram of a compression refrigerating system of the refrigerating and freezing apparatus according to an embodiment of the present invention. Referring to fig. 1 and 2, a refrigerating and freezing apparatus 1 includes a cabinet 10 and a compression refrigeration system 20.

The cabinet 10 defines a refrigerated compartment 11 and at least one non-refrigerated compartment. It will be appreciated that the freezer compartment 11 is a storage compartment that functions as a freezer and the non-freezer compartment is a storage compartment that functions as a non-freezer, for example the non-freezer compartment may be a storage compartment that functions as a freezer or a temperature change. Typically, the temperature in the non-refrigerated compartment is higher than the temperature in the refrigerated compartment 11.

The compression refrigeration system 20 comprises a refrigeration throttling device 23 and a refrigeration evaporator 22 for providing refrigeration capacity for the refrigeration compartment 11, at least one non-refrigeration branch for providing refrigeration capacity for at least one non-refrigeration compartment is connected in parallel to two ends of the refrigeration throttling device 23, a bypass pipeline 241 is connected in parallel to two ends of the refrigeration evaporator 22, the compression refrigeration system 20 further comprises a first switching valve 242 for conducting one of the refrigeration evaporator 22 and the bypass pipeline 241, and an auxiliary heating device 32 for providing heat for the refrigeration evaporator 22 is arranged at the refrigeration evaporator 22.

Specifically, the compression refrigeration system 20 further includes a compressor 21 and a condenser 29 in series with the refrigeration restriction 23 and the refrigeration evaporator 22, and a second switching valve 243 for conducting one of the refrigeration restriction 23 and the at least one non-refrigeration branch. The refrigeration throttle 23 may be a capillary tube, a throttle valve, or the like. Each non-freezing branch may comprise a non-freezing throttle device and a non-freezing evaporator in series. The series connection and the parallel connection referred to in the present invention refer to the physical series connection and the parallel connection of the refrigerant flow paths, respectively, and are not the series connection and the parallel connection of the circuit structures.

When the refrigeration/freezing apparatus 1 is in a state in which the non-freezing compartment is refrigerating, the second switching valve 243 is set to communicate the condenser 29 with the corresponding non-freezing branch of the non-freezing compartment, and the first switching valve 242 is set to communicate with the freezing evaporator 22. At this time, the refrigerant flowing out of the compressor 21 passes through the condenser 29, the second switching valve 243, the non-freezing evaporator and the non-freezing throttle device of the non-freezing branch, the first switching valve 242, and the freezing evaporator 22 in this order, and finally returns to the compressor 21. When the refrigerating and freezing apparatus 1 is in a state in which the freezing compartment is refrigerated, the second switching valve 243 is provided in a state of communicating the condenser 29 with the freezing and throttling device 23, and the first switching valve 242 is provided in a state of turning on the freezing evaporator 22. At this time, the refrigerant flowing out of the compressor 21 passes through the condenser 29, the second switching valve 243, the refrigeration throttle 23, the first switching valve 242, and the refrigeration evaporator 22 in this order, and finally returns to the compressor 21.

In some embodiments, at least one non-freezing compartment comprises a refrigerated compartment 12, at least one non-freezing leg comprises a refrigerated leg comprising a refrigerated throttle 26 and a refrigerated evaporator 25 connected in series, the refrigerated throttle 26 may be a capillary tube or a throttle valve, or the like. The at least one non-freezing compartment may further comprise a temperature change compartment 13, the at least one non-freezing leg may further comprise a temperature change leg for providing cooling to the temperature change compartment 13, the temperature change leg comprising a temperature change evaporator 27 and a temperature change throttling means 28 connected in series, the temperature change throttling means 28 may be a capillary tube or a throttle valve or the like.

Applicant has appreciated that the freezer compartment 11 is not an absolute closed compartment. Air carrying moisture from the outside enters the freezing compartment 11 through the door seal of the freezing compartment 11; the unfrozen food material in the freezing compartment 11 volatilizes certain water; after the food in the freezing compartment 11 is frozen, a small amount of water on the surface of the food sublimates; the frost formed on the surface of the freeze evaporator 22 will sublimate a small amount. That is, the refrigerating and freezing apparatus 1 has various moisture sources which can be used as a source of moisture for moisturizing or humidifying the refrigerating compartment 11. If these moisture can be effectively used for moisturizing or humidifying the freezer compartment 11, it is not necessary to provide any other humidifying device at all.

The applicant has further appreciated that, in the case of air-cooled refrigeration and freezer 1, there is little frost formation in the compartment, which is substantially generated at the evaporator. This is because the evaporator temperature is generally lower than the storage compartment temperature. That is, moisture typically collects and condenses at lower temperatures. Then, if the compartment temperature in the freezing compartment 11 is lower than the evaporator temperature at the freezing evaporator 22, moisture is accumulated in the freezing compartment 11, and it is possible to efficiently humidify the freezing compartment 11 or to increase the humidity in the freezing compartment.

To this end, the invention proposes in particular a control method of a refrigerating and freezing device, comprising:

when the refrigerating and freezing device 1 is in a state that any non-freezing compartment is refrigerated, the compartment humidity in the freezing compartment 11 is obtained; in the non-refrigerated compartment refrigerated state, the first switching valve 242 is in a first state of conducting the freeze evaporator 22; and

when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity, the first switching valve 242 is switched to the second state of conducting the bypass line 241 to prevent the refrigerant from flowing through the freezing evaporator 22, and the auxiliary heating device 32 is activated to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature of the freezing compartment 11.

The inventors have recognized that in the non-refrigerated compartment refrigeration state, the first switching valve 242 is in the first state in which it turns on the freeze evaporator 22, i.e., the refrigerant flows through the freeze evaporator 22, imparting refrigeration to the freeze evaporator 22. When the freezing compartment 11 needs to be moisturized or humidified, the evaporator temperature of the freezing evaporator 22 needs to be increased, and if the refrigerant still flows through the freezing evaporator 22 at this time, the heat provided for the freezing evaporator 22 is at least partially offset by the cold energy brought by the refrigerant to the freezing evaporator 22, so that the evaporator temperature of the freezing evaporator 22 is not increased significantly, and further heat needs to be provided to the freezing evaporator 22, resulting in energy waste.

For this purpose, the refrigerating and freezing apparatus of the present invention not only provides an auxiliary heating device 32 for the freezing evaporator 22, but also connects a bypass line 241 in parallel to both ends of the freezing evaporator 22. During non-freezing compartment cooling, the compartment humidity in the freezing compartment 11 is first obtained, and when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity, the refrigerant flow path is switched to the bypass line 241 by the first switching valve 242 to prevent the refrigerant from continuing to flow through the freezing evaporator 22, and the auxiliary heating 32 is activated. At this time, no refrigerant has flowed through the inside of the freezing evaporator 22, and the refrigerant does not transfer cold to the freezing evaporator 22, and the auxiliary heating device 32 only needs to heat for a short time with a low power to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature of the freezing compartment 11. Thus, the outside moisture entering the freezing compartment 11 through the door seal and the moisture (e.g., the moisture volatilized from the food material) in the freezing compartment 11 are condensed in the freezing compartment 11 having a lower temperature instead of being condensed at the freezing evaporator 22, effectively maintaining or increasing the moisture content in the freezing compartment 11 and thus the humidity in the freezing compartment 11. At the same time, the invention reduces the energy consumption of the auxiliary heating device 32 as much as possible, and reduces the energy consumption increase of the refrigeration and freezing device 1 caused by the moisturizing or humidifying operation of the freezing chamber 11. In addition, the invention does not need to adjust the operation frequency of the compressor 21, thereby not influencing the refrigeration efficiency of the non-refrigeration compartment which is in refrigeration, and the scheme design is more reasonable.

The invention utilizes the self moisture in the refrigerating and freezing device 1 to realize the humidification and the moisture preservation of the freezing compartment 11, the design scheme is completely different from the scheme adopted in the prior art, the design thought is novel, the effect is obvious, and the practical application prospect is good.

Fig. 3 is a schematic flowchart of a control method of a refrigerating and freezing apparatus according to an embodiment of the present invention, referring to fig. 3, the control method of the present invention includes:

step S10, when the refrigeration and freezing device 1 is in a state that any non-refrigeration compartment is refrigerated, obtaining the compartment humidity in the refrigeration compartment 11;

step S20, judging whether the chamber humidity in the freezing chamber 11 is less than a preset minimum humidity; if yes, go to step S30;

in step S30, the first switching valve 242 is switched to the second state of conducting the bypass line 241, and the auxiliary heating device 32 is activated to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature in the freezing compartment 11.

In some embodiments, the refrigeration and freezer 1 further includes a freezer fan 31 for driving the supply of air to the freezer compartment 11. It will be appreciated that when the refrigeration and freezer 1 is in a state in which either of the non-refrigerated compartments is refrigerated, the refrigeration fan 31 is normally in a stopped state. In these embodiments, the control method of the present invention further includes:

when the temperature difference between the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 reaches a preset minimum temperature difference, the auxiliary heating device 32 is turned off and the freezing blower 31 is activated to promote the circulation of the air flow between the freezing evaporator 22 and the freezing compartment 11. Wherein the preset minimum temperature difference is greater than zero.

Due to the provision of the bypass line 241, the refrigerant flow path may be caused to flow through the bypass line 241 without flowing through the freeze evaporator 22 during humidification of the freezer compartment, i.e., the refrigerant may not absorb heat from the freeze evaporator 22. For this reason, the auxiliary heating means 32 is turned off when the temperature difference between the evaporator temperature of the freezing evaporator 22 and the room temperature inside the freezing compartment 11 reaches a preset minimum temperature difference, and on the one hand, the evaporator temperature of the freezing evaporator 22 is not lowered by the turning off of the auxiliary heating means 32, ensuring that the evaporator temperature of the freezing evaporator 22 is continuously higher than the room temperature of the freezing compartment 11, thereby ensuring the moisturizing or humidifying effect on the freezing compartment 11; on the other hand, stopping the auxiliary heating device 32 in time can reduce the energy consumption to the maximum extent, thereby further reducing the energy consumption of the refrigerating and freezing apparatus 1.

The invention sets the freezing blower 31 to start operation when the chamber humidity in the freezing chamber 11 is smaller than the preset minimum humidity and the temperature difference between the evaporator temperature of the freezing evaporator 22 and the chamber temperature of the freezing chamber 11 reaches the preset minimum temperature difference during the refrigeration of the non-freezing chamber, can promote partial frosting on the surface of the freezing evaporator 22 to sublimate rapidly through the freezing blower 31, and ensures that vapor formed by sublimation enters the freezing chamber 11 with lower temperature rapidly, thereby improving the humidification rate of the freezing chamber 11.

Fig. 4 is a schematic flowchart of a control method of a refrigerating and freezing apparatus according to another embodiment of the present invention, referring to fig. 4, the control method of the present invention includes:

step S10, when the refrigeration and freezing device 1 is in a state that any non-refrigeration compartment is refrigerated, obtaining the compartment humidity in the refrigeration compartment 11;

step S20, judging whether the chamber humidity in the freezing chamber 11 is less than a preset minimum humidity; if yes, go to step S30;

step S30, switching the first switching valve 242 to the second state of conducting the bypass line 241 and activating the auxiliary heating device 32 to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature in the freezing compartment 11;

step S40, judging whether the temperature difference between the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 reaches a preset minimum temperature difference; if yes, go to step S50; if not, returning to continue judgment;

in step S50, the auxiliary heating 32 is turned off and the freezing blower 31 is activated to cause the air flow to circulate between the freezing evaporator 22 and the freezing compartment 11.

In some embodiments, after the start of the freezing blower 31, the control method of the present invention further includes:

acquiring the compartment humidity in the freezing compartment 11 again; and

if the chamber humidity in the freezing chamber 11 again acquired reaches the preset maximum humidity, the freezing blower 31 is stopped and the first switching valve 242 is restored to the first state of turning on the freezing evaporator 22 to allow the refrigerant to flow through the freezing evaporator 22.

When the humidity of the compartment in the freezing compartment 11 reaches the preset maximum humidity, the humidity of the compartment in the freezing compartment 11 is quite high, so that the freezing compartment 11 is very suitable for high-quality preservation of food materials, humidification operation of the freezing compartment 11 is not needed, and at the moment, the stop of the freezing fan 31 can prevent the air flow with slightly high temperature from continuously blowing into the freezing compartment 11 to cause excessive temperature rise of the freezing compartment 11. In addition, at this time, the refrigerant flow path is switched to the freezing evaporator 22, so that the continuous increase of the evaporator temperature of the freezing evaporator 22 can be avoided, and the problems of high refrigeration capacity requirement, high energy consumption and the like during refrigeration of the freezing compartment are avoided. It can be seen that the design of the scheme of the further embodiment of the invention is more reasonable.

Fig. 5 is a schematic flowchart of a control method of a refrigerating and freezing apparatus according to still another embodiment of the present invention, referring to fig. 5, the control method of the present invention includes:

step S10, when the refrigeration and freezing device 1 is in a state that any non-refrigeration compartment is refrigerated, obtaining the compartment humidity in the refrigeration compartment 11;

step S20, judging whether the chamber humidity in the freezing chamber 11 is less than a preset minimum humidity; if yes, go to step S30;

step S30, switching the first switching valve 242 to the second state of conducting the bypass line 241 and activating the auxiliary heating device 32 to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature in the freezing compartment 11;

step S40, judging whether the temperature difference between the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 reaches a preset minimum temperature difference; if yes, go to step S50; if not, returning to continue judgment;

step S50, turning off the auxiliary heating device 32 and activating the freezing blower 31 to cause the air flow to circulate between the freezing evaporator 22 and the freezing compartment 11;

step S60, acquiring the chamber humidity in the freezing chamber 11 again; and

step S70, judging whether the acquired room humidity in the freezing room 11 reaches the preset highest humidity; if yes, go to step S80; if not, returning to the step S60 to continuously acquire the chamber humidity in the freezing chamber 11;

in step S80, the freezing blower 31 is stopped, and the first switching valve 242 is returned to the first state of turning on the freezing evaporator 22.

In some embodiments, when the compartment humidity within the refrigerated compartment 11 is greater than or equal to a preset minimum humidity, the control method of the present invention further comprises:

the operation state of the refrigerating and freezing device 1 is kept unchanged until the non-freezing compartment in the refrigerating state reaches the set temperature, and then the non-freezing compartment is switched to the other non-freezing compartment refrigerating state or the freezing compartment refrigerating state through the second switching valve 243.

That is, when the determination result of step S20 in fig. 3 to 5 is no, step S90 may be shifted to: the operation state of the refrigeration and freezing device 1 is kept unchanged, and then the refrigeration and freezing device is operated according to the normal refrigeration process.

Specifically, maintaining the operation state of the refrigerating and freezing apparatus 1 unchanged means that the states and operation parameters of the compressor 21, the freezing blower 31, the auxiliary heating apparatus 32, the first switching valve 242, etc. are not changed by the humidity in the freezing compartment 11, that is, the freezing blower 31 and the auxiliary heating apparatus 32 are maintained in a stopped state, and the first switching valve 242 is maintained in a first state of turning on the freezing evaporator 22.

When the compartment humidity in the freezer compartment 11 is greater than or equal to the preset minimum humidity, it is indicated that the humidity in the freezer compartment 11 is maintained at a level of a certain height and not very low. In this case, during the refrigeration of the non-freezing compartment, the refrigerant flows through the non-freezing evaporator and then flows through the freezing evaporator 22, and the refrigerant flowing through the non-freezing evaporator 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, and when the refrigerant having absorbed heat flows through the freezing evaporator, the temperature of the freezing evaporator 22 may be already close to or higher than the temperature in the freezing compartment 11. Therefore, at this time, the external moisture entering the freezing compartment 11 through the door seal and the moisture (e.g., the volatilized moisture of the food material, the sublimated moisture of the surface of the frozen food material, etc.) in the freezing compartment 11 at a lower temperature can be condensed without being condensed at the freezing evaporator 22 by activating the auxiliary heating device 32 and the freezing fan 31 at all. In this way, both the humidity in the freezer compartment 11 is maintained or increased and the activation of the auxiliary heating 32 is avoided to add additional heat to the refrigeration and freezer 1.

In some embodiments, the predetermined minimum humidity is any relative humidity value ranging from 60% to 70%. For example, the preset minimum humidity threshold may be 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, or 70%. If the humidity in the freezing compartment 11 falls below this range, the quality of the food is affected. If the preset minimum humidity value is too small, the humidification start condition of the freezing compartment 11 is not satisfied even when the humidity in the freezing compartment 11 is low, and the quality of the food in the freezing compartment 11 is affected by the too low humidity, so that the freezing compartment 11 cannot be subjected to a substantial and long-term moisturizing and humidifying operation. If the preset minimum humidity is too high, it is easy to achieve the humidification start condition of the freezing chamber 11, which causes the auxiliary heating device 32 to start too early and too long to affect the temperature in the freezing chamber 11.

In some embodiments, the preset maximum humidity is any relative humidity value ranging between 80% and 100%. For example, the preset maximum humidity may be 80%, 85%, 90%, 95%, or 100%. Within this range, the humidity in the freezing compartment 11 is not saturated, is close to saturated or is just saturated, and the water vapor in the freezing compartment 11 is not condensed or is not easily condensed, so that the moisturizing effect or the humidifying effect is good, and the preservation effect of the food materials is good. At this time, it is not necessary to efficiently humidify the interior of the freezing compartment 11, and therefore, stopping the freezing blower 31 at this time can slow down the rate of humidity increase in the freezing compartment 11, thereby reducing the influence on the temperature in the freezing compartment 11, and not only does not affect the preservation effect of the food in the freezing compartment 11, but also does not greatly affect the freezing effect in the freezing compartment 11.

In some embodiments, the refrigeration and freezer 1 further includes a defrost heating device for defrosting the freezer evaporator 22. It will be appreciated that the defrosting heating device is used for defrosting the entire freezing evaporator 22 for removing the frost generated on the freezing evaporator 22, and thus the heating power of the defrosting heating device is relatively high. While the purpose of heating the freeze evaporator 22 during humidification of the freezer compartment 11 is to raise the evaporator temperature of the freeze evaporator 22, it is not necessary to melt frost on the freeze evaporator 22, i.e. the heating power for heating the freeze evaporator 22 during this process is not required to be too high. Therefore, it is not suitable to heat the freezing evaporator 22 using the defrosting heating device during the humidification of the freezing compartment 11, and it is necessary to separately provide an auxiliary heating device 32 for the freezing evaporator 22.

Further, the heating power of the auxiliary heating device 32 is set to be smaller than the heating power of the defrosting heating device in defrosting, so that the purpose of moisturizing and humidifying the freezing compartment 11 can be achieved, the energy consumed by the auxiliary heating device 32 is reduced, the generated heat is reduced, and the large energy consumption increase and heat burden brought to the refrigerating and freezing device 1 by the moisturizing and humidifying operation of the freezing compartment 11 are avoided.

In some embodiments, the auxiliary heating 32 is positioned against the heat exchange tube walls of the freeze evaporator 22 to increase the efficiency of heat transfer from the auxiliary heating 32 to the freeze evaporator 22 and minimize heat diffusion to other areas.

Specifically, the auxiliary heating device 32 may be a heating wire, and the heating wire may be inserted into an aluminum tube or coated with aluminum foil, etc. to isolate the heating wire from water, thereby improving the safety performance.

In some embodiments, the predetermined minimum temperature difference is any temperature difference ranging from 1 to 5 ℃. For example, the preset minimum temperature difference may take the value of 1 ℃, 2 ℃, 3 ℃, 4 ℃ or 5 ℃. That is, when the evaporator temperature of the freezing evaporator 22 is higher than the room temperature in the freezing room 11 by 1 to 5 ℃, the freezing blower 31 is started, and at this time, the air flow temperature blown to the freezing room 11 by the freezing blower 31 is appropriate, so that not only a good humidification effect can be obtained in the freezing room 11, but also a large influence on the temperature in the freezing room 11 is not exerted.

The present invention also provides a refrigerating and freezing apparatus, and fig. 6 is a schematic block diagram of a refrigerating and freezing apparatus according to an embodiment of the present invention. Referring to fig. 1, 2 and 6, the refrigerating and freezing apparatus 1 of the present invention includes a cabinet 10 and a compression refrigeration system 20.

The cabinet 10 defines a refrigerated compartment 11 and at least one non-refrigerated compartment.

The compression refrigeration system 20 comprises a refrigeration throttle device 23 and a refrigeration evaporator 22 for providing refrigeration capacity for the refrigeration compartment 11, at least one non-refrigeration branch for providing refrigeration capacity for at least one non-refrigeration compartment is connected in parallel to two ends of the refrigeration throttle device 23, a bypass pipeline 241 is connected in parallel to two ends of the refrigeration evaporator 22, and the compression refrigeration system 20 further comprises a first switching valve 242 for conducting one of the refrigeration evaporator 22 and the bypass pipeline 241.

In particular, the refrigeration and freezer 1 also includes an auxiliary heating device 32 and a control device 40. An auxiliary heating 32 is provided at the freeze evaporator 22 for providing heat to the freeze evaporator 22. The control device 40 includes a processor 41 and a memory 42, the memory 42 stores a machine executable program 43, and the machine executable program 43 when executed by the processor 41 is used to implement the control method described in any of the above embodiments.

Specifically, the first switching valve 242 and the auxiliary heating device 32 are both connected to the control device 40 to operate under the control of the control device 40.

Specifically, the processor 41 may be a central processing unit (central processing unit, simply referred to as CPU), or a digital processing unit, or the like. The processor 41 transmits and receives data through a communication interface. The memory 44 is used to store programs executed by the processor 41. Memory 44 is any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, and may be a combination of memories. The above-described machine-executable program 43 may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or downloaded to a computer or an external memory device via a network (e.g., the internet, a local area network, a wide area network, and/or a wireless network).

The refrigeration and freezing apparatus 1 of the present invention is provided with an auxiliary heating device 32 for the freezing evaporator 22, and a bypass line 241 is connected in parallel to both ends of the freezing evaporator 22. During non-freezing compartment cooling, the compartment humidity in the freezing compartment 11 is first obtained, and when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity, the refrigerant flow path is switched to the bypass line 241 by the first switching valve 242 to prevent the refrigerant from continuing to flow through the freezing evaporator 22, and the auxiliary heating 32 is activated. At this time, no refrigerant has flowed through the inside of the freezing evaporator 22, and the refrigerant does not transfer cold to the freezing evaporator 22, and the auxiliary heating device 32 only needs to heat for a short time with a low power to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature of the freezing compartment 11. Thus, the outside moisture entering the freezing compartment 11 through the door seal and the moisture (e.g., the moisture volatilized from the food material) in the freezing compartment 11 are condensed in the freezing compartment 11 having a lower temperature instead of being condensed at the freezing evaporator 22, effectively maintaining or increasing the moisture content in the freezing compartment 11 and thus the humidity in the freezing compartment 11. At the same time, the invention reduces the energy consumption of the auxiliary heating device 32 as much as possible, and reduces the energy consumption increase of the refrigeration and freezing device 1 caused by the moisturizing or humidifying operation of the freezing chamber 11. In addition, the invention does not need to adjust the operation frequency of the compressor 21, thereby not influencing the refrigeration efficiency of the non-refrigeration compartment which is in refrigeration, and the scheme design is more reasonable.

The invention utilizes the self moisture in the refrigerating and freezing device 1 to realize the humidification and the moisture preservation of the freezing compartment 11, the design scheme is completely different from the scheme adopted in the prior art, the design thought is novel, the effect is obvious, and the practical application prospect is good.

Further, the refrigeration and freezer 1 also includes a refrigeration fan 31 coupled to the control device 40, the refrigeration fan 31 being configured to controllably activate when a temperature difference between the evaporator temperature of the refrigeration evaporator 22 and the compartment temperature within the refrigeration compartment 11 reaches a predetermined minimum temperature difference during non-refrigeration to facilitate the circulating flow of air between the refrigeration evaporator 22 and the refrigeration compartment 11.

It will be appreciated by those skilled in the art that the refrigeration and freezer 1 of the present invention is not limited to the three door refrigerator shown in fig. 1 and may be a single door refrigerator, a double door refrigerator, or other refrigerators having a freezer compartment.

It will also be appreciated by those skilled in the art that the refrigeration and freezer 1 of the present invention includes not only a refrigerator but also a freezer, a refrigerator or other refrigeration and freezer having at least a freezing function.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A control method of a refrigeration and freezing device, the refrigeration and freezing device comprises a box body and a compression refrigeration system, a freezing compartment and at least one non-freezing compartment are defined in the box body, the compression refrigeration system comprises a freezing throttling device and a freezing evaporator, the freezing throttling device is used for providing cold for the freezing compartment, two ends of the freezing throttling device are connected in parallel with at least one non-freezing branch used for providing cold for the non-freezing compartment respectively, two ends of the freezing evaporator are connected in parallel with bypass pipelines, the compression refrigeration system further comprises a first switching valve used for conducting one of the freezing evaporator and the bypass pipelines, and an auxiliary heating device used for providing heat for the freezing evaporator is arranged at the freezing evaporator; the control method comprises the following steps:

when the refrigeration and freezing device is in any refrigeration state of a non-refrigeration compartment, obtaining the compartment humidity in the refrigeration compartment; in a refrigeration state of the non-refrigeration compartment, the first switching valve is in a first state of conducting the refrigeration evaporator; and

when the chamber humidity in the freezing chamber is smaller than the preset minimum humidity, the first switching valve is switched to a second state of conducting the bypass pipeline to prevent the refrigerant from flowing through the freezing evaporator, and the auxiliary heating device is started to raise the evaporator temperature of the freezing evaporator to be higher than the chamber temperature of the freezing chamber.

2. The control method of claim 1, the refrigeration and freezer further comprising a freezer fan for driving air supply to the freezer compartment; and the control method further comprises:

when the temperature difference between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room reaches a preset minimum temperature difference, the auxiliary heating device is turned off, and the freezing blower is started to promote the air flow to circulate between the freezing evaporator and the freezing room; wherein the method comprises the steps of

The preset minimum temperature difference is greater than zero.

3. The control method according to claim 2, after starting the freezing blower, the control method further comprising:

acquiring the chamber humidity in the freezing chamber again; and

and stopping the refrigerating fan and restoring the first switching valve to a first state of conducting the refrigerating evaporator to allow the refrigerant to flow through the refrigerating evaporator if the acquired room humidity in the refrigerating room reaches the preset maximum humidity.

4. A control method according to claim 3, wherein

The preset minimum humidity is any relative humidity value ranging from 60% to 70%; and/or

The preset maximum humidity is any relative humidity value ranging from 80% to 100%.

5. The control method of claim 1, wherein the compression refrigeration system further comprises a second switching valve for conducting one of the refrigeration restriction and the at least one non-refrigeration branch; and is also provided with

When the room humidity in the freezing room is greater than or equal to the preset minimum humidity, the control method further comprises:

and keeping the running state of the refrigeration and freezing device unchanged until the non-freezing compartment in the refrigerating state reaches the set temperature, and switching to the refrigerating state of other non-freezing compartments or the refrigerating state of the freezing compartment through the second switching valve.

6. The control method according to claim 1, the refrigerating and freezing apparatus further comprising defrosting heating means for defrosting the freezing evaporator; wherein the method comprises the steps of

The heating power of the auxiliary heating device is set to be smaller than the heating power of the defrosting heating device during defrosting.

7. The control method according to claim 1, wherein

The auxiliary heating device is attached to the wall of the heat exchange tube of the freezing evaporator.

8. The control method according to claim 1, wherein

The preset minimum temperature difference is any temperature difference value ranging from 1 ℃ to 5 ℃.

9. The control method according to claim 1, wherein

The at least one non-refrigerated compartment comprises a refrigerated compartment, the at least one non-refrigerated leg comprises a refrigerated leg comprising a refrigerated throttle and a refrigerated evaporator connected in series; and/or

The at least one non-freezing compartment comprises a temperature change compartment, the at least one non-freezing leg comprises a temperature change leg comprising a temperature change throttling device and a temperature change evaporator connected in series.

10. A refrigerated chiller comprising:

a housing defining a refrigerated compartment and at least one non-refrigerated compartment therein;

the compression refrigeration system comprises a refrigeration throttling device and a refrigeration evaporator, wherein the refrigeration throttling device is used for providing cold energy for the refrigeration compartment, two ends of the refrigeration throttling device are connected in parallel with at least one non-refrigeration branch for providing cold energy for the at least one non-refrigeration compartment respectively, two ends of the refrigeration evaporator are connected in parallel with a bypass pipeline, and the compression refrigeration system further comprises a first switching valve used for conducting one of the refrigeration evaporator and the bypass pipeline;

the auxiliary heating device is arranged at the freezing evaporator and is used for providing heat for the freezing evaporator; and

control device comprising a processor and a memory, said memory having stored therein a machine executable program, and said machine executable program when executed by said processor being adapted to carry out the control method according to any one of claims 1-9.