CN116538735A - 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 refrigerating compartment and at least one non-refrigerating compartment are defined in the box body, the compression refrigerating system comprises a compressor, a condenser, a refrigerating throttling device and a refrigerating evaporator which are sequentially connected in series into a loop, two ends of the refrigerating throttling device are connected with at least one non-refrigerating branch and a throttling branch with an additional throttling valve in parallel, and the compression refrigerating system further comprises a switching valve for selectively conducting one or more of the refrigerating throttling device, the at least one non-refrigerating branch and the throttling branch. The control method of the invention comprises the following steps: when the refrigeration and freezing device is in a state of refrigerating any non-refrigeration compartment, obtaining the compartment humidity in the refrigeration compartment; and when the chamber humidity in the freezing chamber is smaller than the preset minimum humidity, regulating the switching valve to a state of simultaneously conducting the throttling branch and the non-freezing branch corresponding to the non-freezing chamber in a refrigerating state.

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 by providing a method for controlling a refrigeration and freezer that moisturizes or humidifies a refrigerated compartment while meeting the refrigeration requirements of a non-refrigerated compartment.

It is a further object of the first aspect of the present invention to increase the humidification efficiency of a refrigerated compartment without unduly affecting the temperature of the refrigerated compartment.

It is an object of a second aspect of the present invention to provide a refrigeration and freezer that moisturizes or humidifies a refrigerated compartment while meeting the refrigeration requirements of a non-refrigerated 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 comprising a cabinet and a compression refrigeration system, the cabinet defining therein a freezing compartment and at least one non-freezing compartment, the compression refrigeration system comprising a compressor, a condenser, a freezing throttling device and a freezing evaporator in series in turn, the freezing throttling device being connected in parallel at both ends with at least one non-freezing branch for providing cold to the at least one non-freezing compartment, respectively, and with a throttling branch having an additional throttling valve, the compression refrigeration system further comprising a switching valve for selectively switching on one or more of the freezing throttling device, the at least one non-freezing branch and the throttling branch; the control method comprises the following steps:

when the refrigeration and freezing device is in a state of refrigerating any non-refrigeration compartment, obtaining the compartment humidity in the refrigeration compartment; and

when the chamber humidity in the freezing chamber is smaller than the preset minimum humidity, the switching valve is adjusted to a state of simultaneously conducting the throttling branch and the non-freezing branch corresponding to the non-freezing chamber in a refrigerating state, so that the temperature of the evaporator of the freezing evaporator is raised to be higher than the chamber temperature in the freezing chamber.

Optionally, after the switching valve is adjusted to a state of simultaneously conducting the throttling branch and the non-freezing branch corresponding to the non-freezing compartment in the refrigerating state, the control method further includes:

acquiring the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment; and

increasing the opening of the additional throttle valve when the temperature difference between the evaporator temperature of the freezing evaporator and the inter-chamber temperature in the freezing compartment has not reached a first preset minimum temperature difference, so that the temperature difference between the evaporator temperature of the freezing evaporator and the inter-chamber temperature in the freezing compartment reaches the first preset minimum temperature difference; wherein the method comprises the steps of

The first preset minimum temperature difference is greater than zero.

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:

and when the temperature difference between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room reaches the first preset minimum temperature difference, starting the freezing fan to promote the circulation flow of air flow between the freezing evaporator and the freezing room.

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

acquiring the chamber humidity in the freezing chamber again; and

and if the acquired room humidity in the freezing room reaches the preset maximum humidity, successively reducing the opening of the additional throttle valve until the temperature difference between the room temperature in the freezing room and the evaporator temperature of the freezing evaporator reaches a second preset minimum temperature difference, wherein the second preset minimum temperature difference is larger than zero, and keeping the opening of the additional throttle valve unchanged.

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

Optionally, the second preset minimum temperature difference is any temperature difference in a range of 1-3 ℃.

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, when the refrigeration and freezing device is in a state of refrigerating in any non-refrigeration compartment, the rotating speed of the freezing fan is smaller than the set rotating speed of the freezing fan when the refrigeration and freezing device is in a refrigeration state of refrigerating in the refrigeration compartment.

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 compressor, a condenser, a freezing throttling device and a freezing evaporator which are sequentially connected in series into a loop, wherein two ends of the freezing throttling device are connected in parallel with at least one non-freezing branch for providing cold energy for the at least one non-freezing compartment respectively, and a throttling branch with an additional throttling valve, and the compression refrigeration system further comprises a switching valve for selectively conducting one or more of the freezing throttling device, the at least one non-freezing branch and the throttling branch; 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 of the invention is especially provided with a throttling branch with an additional throttling valve connected in parallel at two ends of the freezing throttling device. During the refrigeration of the non-refrigeration compartment, the compartment humidity in the refrigeration compartment is firstly obtained, and when the compartment humidity in the refrigeration compartment is smaller than the preset minimum humidity, the switching valve is adjusted to conduct the throttling branch and the non-refrigeration branch corresponding to the non-refrigeration compartment which is in refrigeration at the same time, so that part of the refrigerant flows through the additional throttling valve, and the other part of the refrigerant flows through the non-refrigeration throttling device and the non-refrigeration evaporator corresponding to the non-refrigeration compartment which is in refrigeration. Therefore, the refrigerant flowing to the freezing evaporator comprises the refrigerant passing through the two branches with different throttling degrees, on one hand, the refrigerating requirement of the non-freezing compartment is met, on the other hand, the refrigerant flowing to the freezing evaporator with low throttling degrees through the throttling branches can raise the temperature of the evaporator of the freezing evaporator, when the temperature of the evaporator of the freezing evaporator is raised to be higher than the compartment temperature of the freezing compartment, external water vapor entering the freezing compartment through the dock seal and moisture (such as the moisture volatilized by food materials) in the freezing compartment with lower temperature can be condensed in the freezing compartment rather than at the freezing evaporator, and the moisture content in the freezing compartment is effectively maintained or raised, so that the humidity in the freezing compartment is maintained or raised.

Further, the evaporator temperature of the freezing evaporator cannot be too high as compared to the compartment temperature in the freezing compartment, taking into account the temperature in the freezing compartment. Therefore, the invention presets a better temperature difference value between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room, namely a first preset minimum temperature difference, and the opening of the additional throttle valve is regulated to enable the temperature difference value between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room to quickly reach the first preset minimum temperature difference, thereby not only playing an obvious humidifying role, improving humidifying efficiency, but also not excessively influencing the room temperature in the freezing room.

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 diagram after activating a cooling fan in accordance with one specific 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 includes a compressor 21, a condenser 29, a refrigeration restriction 23, and a refrigeration evaporator 22 in series in a circuit, and the refrigeration restriction 23 may be a capillary tube or a throttle valve. At least one non-freezing branch for providing cold to the at least one non-freezing compartment and a throttling branch 243 having an additional throttle valve 242 are connected in parallel to both ends of the freezing and throttling means 23, and the compression refrigeration system 20 further comprises a switching valve 241 for selectively switching on one or more of the freezing and throttling means 23, the at least one non-freezing branch and the throttling branch 243. That is, the switching valve 241 may conduct only one of the freezing and throttling means 23, the at least one non-freezing branch, and the throttling branch 243 such that the refrigerant flowing out of the condenser 29 flows through only the branch and then flows to the freezing evaporator 22; the switching valve 241 may also be configured to open two or more of the refrigeration throttle 23, the at least one non-refrigeration branch, and the throttle branch 243 so that the refrigerant flowing out of the condenser 29 is branched to the two or more branches and then flows to the refrigeration evaporator 22.

In particular, 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 refrigerating and freezing apparatus 1 is in a state in which the non-freezing compartment is refrigerating, the switching valve 241 is provided to communicate only the condenser 29 with the non-freezing branch corresponding to the non-freezing compartment, and at this time, the refrigerant flowing out from the compressor 21 passes through the condenser 29, the switching valve 24, the non-freezing evaporator of the non-freezing branch, the non-freezing throttling device, 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 switching valve 24 is provided in a state in which the condenser 29 and the freezing and throttling device 23 are communicated, and at this time, the refrigerant flowing out of the compressor 21 passes through the condenser 29, the switching valve 24, the freezing and throttling device 23 and the freezing and refrigerating 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; and

when the compartment humidity in the freezing compartment 11 is less than the preset minimum humidity, the switching valve 241 is adjusted to a state of simultaneously conducting the throttling branch 243 and the non-freezing branch corresponding to the non-freezing compartment in the refrigerating state to raise the evaporator temperature of the freezing evaporator 22 to be higher than the compartment temperature in the freezing compartment 11.

The refrigerating and freezing device 1 of the invention is connected in parallel with a throttle branch 243 with an additional throttle 242, in particular at both ends of the refrigerating throttle 23. During non-freezing compartment cooling, the compartment humidity in the freezing compartment 11 is first acquired, and when the compartment humidity in the freezing compartment 11 is less than a preset minimum humidity, the switching valve 241 is adjusted to simultaneously conduct the throttling branch 243 and the non-freezing branch corresponding to the non-freezing compartment being cooled, so that part of the refrigerant flows through the additional throttling valve 242 and the other part of the refrigerant flows through the non-freezing throttling device and the non-freezing evaporator corresponding to the non-freezing compartment being cooled. Thus, the refrigerant flowing to the freezing evaporator 22 includes the refrigerant throttled by the two branches with different throttle degrees, on one hand, the refrigeration requirement of the non-freezing compartment is satisfied, on the other hand, the refrigerant flowing to the freezing evaporator 22 with low throttle degree flowing through the throttle branch 243 increases the evaporator temperature of the freezing evaporator 22, when the evaporator temperature of the freezing evaporator 22 is increased to be higher than the compartment temperature of the freezing compartment 11, external water vapor entering the freezing compartment 11 through the door seal and moisture (such as moisture volatilized by food materials) in the freezing compartment 11 are condensed in the freezing compartment 11 with lower temperature instead of being condensed at the freezing evaporator 22, so that the moisture content in the freezing compartment 11 is effectively maintained or increased, and the humidity in the freezing compartment 11 is maintained or increased.

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; if not, returning to acquire the chamber humidity in the freezing chamber 11 again;

in step S30, the switching valve 241 is adjusted to a state of simultaneously conducting the throttle leg 243 and the non-freezing leg corresponding to the non-freezing compartment in the cooling state 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, after the switching valve 241 is adjusted to a state of simultaneously conducting the throttling branch 243 and the corresponding non-freezing branch of the non-freezing compartment in the cooling state, the control method of the present invention further comprises:

acquiring the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11; and

the opening of the additional throttle valve 242 is increased when the temperature difference between the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 has not reached the first preset minimum temperature difference, such that the temperature difference between the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 reaches the first preset minimum temperature difference.

Wherein the first preset minimum temperature difference is greater than zero.

The evaporator temperature of the freezing evaporator 22 cannot be too high as compared to the compartment temperature in the freezing compartment 11, taking into account the temperature in the freezing compartment 11. Therefore, the present invention presets a preferred temperature difference value between the evaporator temperature of the freezing evaporator 22 and the inter-chamber temperature in the freezing compartment 11, i.e., a first preset minimum temperature difference, and the opening of the additional throttle valve 242 is adjusted to make the temperature difference value between the evaporator temperature of the freezing evaporator 22 and the inter-chamber temperature in the freezing compartment 11 quickly reach the first preset minimum temperature difference, thereby not only quickly playing an obvious humidifying role, improving humidifying efficiency, but also not excessively affecting the inter-chamber temperature in the freezing compartment 11.

Specifically, 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, after the switching valve 241 is adjusted to a state of simultaneously conducting the throttling branch 243 and the non-freezing branch corresponding to the non-freezing compartment in the refrigerating state, the control method of the present invention further includes:

step S40, acquiring the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11;

step S50, 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 first preset minimum temperature difference; if not, go to step S60;

step S60 increases the opening of the additional throttle valve 242, and returns to step S40 to acquire the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 again.

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, referring to fig. 4, the control method of the present invention further includes:

when the temperature difference between the evaporator temperature of the freezing evaporator 22 and the inter-chamber temperature in the freezing compartment 11 reaches the first preset minimum temperature difference, the process goes to step S70;

in step S70, the freezing blower 31 is activated to cause the air flow to circulate between the freezing evaporator 22 and the freezing compartment 11.

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 first 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 further improving the humidification rate of the freezing chamber 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 acquired room humidity in the freezing room 11 reaches the preset maximum humidity, the opening of the additional throttle valve 242 is gradually reduced until the temperature difference between the room temperature in the freezing room 11 and the evaporator temperature of the freezing evaporator 22 reaches the second preset minimum temperature difference, which is greater than zero, and the opening of the additional throttle valve 242 is maintained unchanged.

When the humidity in the freezing compartment 11 reaches the preset maximum humidity, the humidity in the freezing compartment 11 is quite high, so that the freezing compartment 11 is very suitable for high-quality preservation of food materials, and the humidifying operation of the freezing compartment 11 is not needed. At this time, the present invention successively reduces the opening degree of the additional throttle valve 242 so that the evaporator temperature of the freezing evaporator 22 is gradually reduced, and avoids the phenomenon that the opening degree adjustment of the additional throttle valve 242 is excessively large to cause the reduction of the evaporator temperature of the freezing evaporator 22 and uncontrolled speed and amplitude to cause the significant reduction of the compartment humidity in the freezing compartment 11 again. When the evaporator temperature of the freezing evaporator 22 is reduced to be lower than the chamber temperature in the freezing chamber 11 by the second preset minimum temperature difference, the opening of the additional throttle valve 242 is kept unchanged, and at this time, the evaporator temperature of the freezing evaporator 22 is slightly lower than the chamber temperature in the freezing chamber 11, so that the temperature in the freezing chamber 11 can be properly regulated, the obvious reduction of the humidity in the freezing chamber 11 can not be caused, and the scheme design is more reasonable.

Specifically, referring to the schematic flow chart shown in fig. 5 after the start of the freezing blower according to one specific embodiment of the present invention, after the start of the freezing blower 31, the control method of the present invention further includes:

step S80, acquiring the chamber humidity in the freezing chamber 11 again; and

step S90, judging whether the acquired room humidity in the freezing room 11 reaches the preset highest humidity; if yes, go to step S100; if not, returning to the step S80 to continue to acquire the chamber humidity in the freezing chamber 11;

step S100 of reducing the opening degree of the additional throttle valve 242;

step S110, acquiring the evaporator temperature of the freezing evaporator 22 and the compartment temperature in the freezing compartment 11 again;

step S120, judging whether the temperature difference between the compartment temperature in the freezing compartment 11 acquired again and the evaporator temperature of the freezing evaporator 22 reaches a second preset minimum temperature difference; if yes, go to step S130; if not, the process proceeds to step S100 to reduce the opening degree of the additional throttle 242 again.

Step S130, the opening degree of the additional throttle valve 242 is kept unchanged.

Specifically, the opening of the additional throttle valve 242 may be maintained until the inter-chamber temperature in the non-freezing compartment being cooled reaches its set shutdown point temperature, i.e., until the non-freezing compartment being cooled is finished.

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

the operation of the freezing blower 31 is maintained until the room temperature in the non-freezing room in the refrigerating state reaches the set shutdown point temperature thereof.

That is, the operation of the refrigerating fan 31 may be continued until the refrigerating operation of the non-refrigerating compartment being refrigerated is completed after the start. This is because, when the compartment humidity in the freezing compartment 11 does not reach the preset maximum humidity, the freezing blower 31 is operated to cause the frost on the freezing evaporator 22 to sublimate rapidly and cause the vapor formed by the sublimation to accumulate in the freezing compartment 11 to further improve the humidifying efficiency of the freezing compartment 11. When the chamber humidity in the freezing chamber 11 reaches the preset maximum humidity, the evaporator temperature of the freezing evaporator 22 is slightly lower than the chamber temperature in the freezing chamber 11, and the cooling air flow with the temperature about equal to or slightly lower than the chamber temperature in the freezing chamber 11 can be delivered into the freezing chamber 11 by the continuous operation of the freezing blower 31, so as to help maintain the chamber temperature in the freezing chamber 11 within a preferred range.

In some embodiments, when the refrigeration chiller 1 is in any non-freezing compartment refrigerated state, the rotational speed of the freezing blower 31 is less than the set rotational speed of the freezing blower 31 when the refrigeration chiller 1 is in the freezing compartment refrigerated state. In this way, the vapor formed by sublimating part of the frost on the freezing evaporator 22 can be sent into the freezing chamber 11 faster, and more air flow with relatively higher temperature can be prevented from entering the freezing chamber 11, so that the temperature in the freezing chamber 11 is prevented from rising more.

In some embodiments, the first predetermined minimum temperature difference is any temperature difference ranging from 1 to 5 ℃. For example, the first preset minimum temperature difference may take the value 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.

In some embodiments, the second predetermined minimum temperature difference is any temperature difference ranging from 1 to 3 ℃. For example, the second preset minimum temperature difference may take the value of 1 ℃, 2 ℃ or 3 ℃. That is, when the evaporator temperature of the freezing evaporator 22 is 1 to 3 ℃ lower than the chamber temperature in the freezing chamber 11, the opening degree of the additional throttle valve 242 is kept unchanged, and at this time, it is possible to prevent the humidity in the freezing chamber 11 from being significantly lowered while supplying a cooling air flow having a slightly lower temperature into the freezing chamber 11.

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 reach the humidification start condition of the freezing compartment 11, and the switching valve 241 switches the refrigerant flow path too early and too long, which affects the cooling of the non-freezing compartment.

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, at this time, the opening of the additional throttle valve 242 is adjusted to reduce the temperature of the freezing evaporator 22 to a temperature slightly lower than the temperature of the freezing compartment 11, which is advantageous for maintaining the temperature of the freezing compartment 11 in time and avoiding the influence of the excessive increase of the temperature of the freezing compartment 11 on the preservation quality of the food.

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 includes a compressor 21, a condenser 29, a refrigeration chiller 23, and a refrigeration evaporator 22 in series in a circuit. At least one non-freezing branch for providing cold to the at least one non-freezing compartment and a throttling branch 243 having an additional throttle valve 242 are connected in parallel to both ends of the freezing and throttling means 23, and the compression refrigeration system 20 further comprises a switching valve 241 for selectively switching on one or more of the freezing and throttling means 23, the at least one non-freezing branch and the throttling branch 243.

In particular, the refrigeration and freezer 1 also includes a control device 40. 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 switching valve 241 and the additional throttle valve 242 are each electrically 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 refrigerating and freezing device 1 of the invention is connected in parallel with a throttle branch 243 with an additional throttle 242, in particular at both ends of the refrigerating throttle 23. During non-freezing compartment cooling, the compartment humidity in the freezing compartment 11 is first acquired, and when the compartment humidity in the freezing compartment 11 is less than a preset minimum humidity, the switching valve 241 is adjusted to simultaneously conduct the throttling branch 243 and the non-freezing branch corresponding to the non-freezing compartment being cooled, so that part of the refrigerant flows through the additional throttling valve 242 and the other part of the refrigerant flows through the non-freezing throttling device and the non-freezing evaporator corresponding to the non-freezing compartment being cooled. Thus, the refrigerant flowing to the freezing evaporator 22 includes the refrigerant throttled by the two branches with different throttle degrees, on one hand, the refrigeration requirement of the non-freezing compartment is satisfied, on the other hand, the refrigerant flowing to the freezing evaporator 22 with low throttle degree flowing through the throttle branch 243 increases the evaporator temperature of the freezing evaporator 22, when the evaporator temperature of the freezing evaporator 22 is increased to be higher than the compartment temperature of the freezing compartment 11, external water vapor entering the freezing compartment 11 through the door seal and moisture (such as moisture volatilized by food materials) in the freezing compartment 11 are condensed in the freezing compartment 11 with lower temperature instead of being condensed at the freezing evaporator 22, so that the moisture content in the freezing compartment 11 is effectively maintained or increased, and the humidity in the freezing compartment 11 is maintained or increased.

Further, the refrigeration and freezing apparatus 1 further comprises a freezing blower 31 connected to the control device 40, the freezing blower 31 being configured to be controllably activated when the temperature difference between the evaporator temperature of the freezing evaporator 22 and the compartment temperature within the freezing compartment 11 reaches a first preset minimum temperature difference during non-freezing refrigeration to promote a circulating flow of air between the freezing evaporator 22 and the freezing compartment 11, improving the humidification efficiency within the freezing 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 compressor, a condenser, a freezing throttling device and a freezing evaporator which are sequentially connected in series into a loop, two ends of the freezing throttling device are connected in parallel with at least one non-freezing branch for providing cold energy for the at least one non-freezing compartment and a throttling branch with an additional throttling valve, and the compression refrigeration system further comprises a switching valve for selectively conducting one or more of the freezing throttling device, the at least one non-freezing branch and the throttling branch; the control method comprises the following steps:

when the refrigeration and freezing device is in a state of refrigerating any non-refrigeration compartment, obtaining the compartment humidity in the refrigeration compartment; and

when the chamber humidity in the freezing chamber is smaller than the preset minimum humidity, the switching valve is adjusted to a state of simultaneously conducting the throttling branch and the non-freezing branch corresponding to the non-freezing chamber in a refrigerating state, so that the temperature of the evaporator of the freezing evaporator is raised to be higher than the chamber temperature in the freezing chamber.

2. The control method according to claim 1, after adjusting the switching valve to a state in which the throttle leg and a non-freezing leg corresponding to a non-freezing compartment in a cooling state are simultaneously turned on, the control method further comprising:

acquiring the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment; and

increasing the opening of the additional throttle valve when the temperature difference between the evaporator temperature of the freezing evaporator and the inter-chamber temperature in the freezing compartment has not reached a first preset minimum temperature difference, so that the temperature difference between the evaporator temperature of the freezing evaporator and the inter-chamber temperature in the freezing compartment reaches the first preset minimum temperature difference; wherein the method comprises the steps of

The first preset minimum temperature difference is greater than zero.

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

and when the temperature difference between the evaporator temperature of the freezing evaporator and the room temperature in the freezing room reaches the first preset minimum temperature difference, starting the freezing fan to promote the circulation flow of air flow between the freezing evaporator and the freezing room.

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

acquiring the chamber humidity in the freezing chamber again; and

and if the acquired room humidity in the freezing room reaches the preset maximum humidity, successively reducing the opening of the additional throttle valve until the temperature difference between the room temperature in the freezing room and the evaporator temperature of the freezing evaporator reaches a second preset minimum temperature difference, wherein the second preset minimum temperature difference is larger than zero, and keeping the opening of the additional throttle valve unchanged.

5. The control method according to claim 4, wherein

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

6. The control method according to claim 4, wherein

The second preset minimum temperature difference is any temperature difference value ranging from 1 ℃ to 3 ℃.

7. The control method according to claim 4, 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%.

8. A control method according to claim 3, wherein

When the refrigeration and freezing device is in a refrigerating state of any non-refrigerating compartment, the rotating speed of the refrigerating fan is smaller than the set rotating speed of the refrigerating fan when the refrigeration and freezing device is in the refrigerating state of the refrigerating compartment.

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 compressor, a condenser, a freezing throttling device and a freezing evaporator which are sequentially connected in series into a loop, wherein two ends of the freezing throttling device are connected in parallel with at least one non-freezing branch for providing cold energy for the at least one non-freezing compartment respectively, and a throttling branch with an additional throttling valve, and the compression refrigeration system further comprises a switching valve for selectively conducting one or more of the freezing throttling device, the at least one non-freezing branch and the throttling branch; 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.