CN116481231A - Refrigerating and freezing device and control method thereof - Google Patents

Abstract

The invention relates to a refrigeration and freezing device and a control method thereof, wherein the refrigeration and freezing device comprises a box body which is limited with a freezing compartment, a freezing fan and a compression refrigeration system, and the compression refrigeration system comprises a compressor, a freezing evaporator connected with the compressor in series and a freezing throttling device. The control method of the invention comprises the following steps: when the refrigerating and freezing device reaches a preset automatic shutdown condition, controlling the refrigerating fan to be in a stop state, controlling the refrigerant to flow through the refrigerating throttling device and the refrigerating evaporator, and controlling the compressor to run at a preset frequency; stopping the operation of the compressor and starting the refrigerating fan when the operation time of the compressor at the preset frequency reaches the first preset time; and stopping the refrigerating fan after the refrigerating fan continuously operates for a second preset time period. The invention presets a lower preset frequency for the compressor, only monitors the operation time of the compressor and the refrigerating fan, and simplifies the control logic on the premise of improving the average humidity of the refrigerating compartment.

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 air-cooled refrigeration and freezing device generally has the problem that the humidity fluctuation is large during the freezing and refrigerating period, the humidity fluctuation and the humidity are low, and food stored in the freezing chamber can lose water, so that the taste of the food is affected, nutrition loss is caused, and the user experience is affected.

Disclosure of Invention

An object of a first aspect of the present invention is to overcome at least one of the drawbacks of the prior art by providing a control method of a refrigeration and freezer capable of increasing the average humidity in the freezer compartment.

It is a further object of the first aspect of the present invention to simplify the control logic of a refrigeration chiller.

An object of the second aspect of the present invention is to provide a refrigerating and freezing apparatus capable of increasing the average humidity in a freezing compartment.

According to a first aspect of the present invention, there is provided a method of controlling a refrigeration chiller comprising a cabinet defining a freezer compartment, a refrigeration fan for driving an air supply into the freezer compartment, and a compression refrigeration system comprising a compressor, a refrigeration evaporator connected in series with the compressor, and a refrigeration throttle; the control method comprises the following steps:

when the refrigeration and freezing device reaches a preset automatic shutdown condition, controlling the refrigerating fan to be in a stop state, controlling the refrigerant to flow through the refrigeration throttling device and the refrigeration evaporator, and controlling the compressor to run at a preset frequency, wherein the preset frequency is set so that the evaporator temperature of the refrigeration evaporator is higher than the compartment temperature in the refrigeration compartment;

stopping the operation of the compressor and starting the refrigerating fan when the operation time of the compressor at the preset frequency reaches a first preset time;

and stopping the refrigerating fan after the refrigerating fan continuously operates for a second preset time.

Optionally, the preset frequency is 20-90 hz lower than the first set frequency of the compressor in the refrigerating state of the refrigerating compartment.

Optionally, the first preset duration is any duration value ranging from 1 to 10min.

Optionally, at least one non-freezing compartment is further defined in the box, 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 the compression refrigeration system further comprises a switching valve for conducting one of the freezing throttling device and the at least one non-freezing branch;

before the automatic shutdown condition is reached, the refrigerating and freezing device is in a refrigerating chamber refrigerating state, and the refrigerating fan is in an operating state in the refrigerating chamber refrigerating state; and is also provided with

The step of controlling the flow of refrigerant through the refrigeration throttle and the refrigeration evaporator comprises:

maintaining the state of the switching valve unchanged;

the step of controlling the refrigerating fan to be in a stop state comprises the following steps:

stopping the refrigerating fan.

Optionally, at least one non-freezing compartment is further defined in the box, 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 the compression refrigeration system further comprises a switching valve for conducting one of the freezing throttling device and the at least one non-freezing branch;

before the automatic shutdown condition is reached, the refrigeration and freezing device is in a non-refrigeration compartment refrigeration state, and the refrigerating fan is in a stop state in the non-refrigeration compartment refrigeration state; and is also provided with

The step of controlling the flow of refrigerant through the refrigeration throttle and the refrigeration evaporator comprises:

switching the switching valve to a state of conducting the refrigeration throttling device;

the step of controlling the refrigerating fan to be in a stop state comprises the following steps:

and keeping the stop state of the refrigerating fan unchanged.

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 capillary tube 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 capillary and a temperature change evaporator connected in series.

Optionally, the second preset duration is any duration value ranging from 3 to 10min.

Optionally, the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device reaches the respective set temperature.

According to a second aspect of the present invention there is also provided a refrigeration and freezing apparatus comprising a cabinet defining a freezer compartment, a refrigeration fan for driving an air supply into the freezer compartment, and a compression refrigeration system comprising a compressor, a refrigeration evaporator connected in series with the compressor, and a refrigeration throttle, the refrigeration and freezing apparatus further comprising:

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.

Optionally, at least one non-freezing compartment is further defined in the box, 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 the compression refrigeration system further comprises a switching valve for conducting one of the freezing throttling device and the at least one non-freezing branch; wherein the method comprises the steps of

The switching valve is configured to controllably maintain or switch to a state in which the refrigeration and freezer is turned on when the refrigeration and freezer reaches a preset auto-off condition.

According to the control method, a lower preset frequency is preset according to experience, and when the compressor runs at the preset frequency, the evaporator temperature of the freezing evaporator is higher than the compartment temperature in the freezing compartment. When the refrigerating and freezing device reaches a preset automatic shutdown condition, the compressor is not stopped immediately, the freezing fan is stopped firstly, the compressor is stopped after the compressor is operated for a first preset time at the preset frequency, at this time, the temperature of the freezing evaporator is raised to be at least higher than the temperature of the freezing compartment, and then the freezing fan is started to promote the air flow to circulate between the freezing evaporator and the freezing compartment, so that external water vapor entering the freezing compartment through the door seal, water (such as water volatilized by food materials) and water formed by frost sublimation on the freezing evaporator can be condensed in the freezing compartment with lower temperature instead of at the freezing evaporator, thereby effectively improving the water content in the freezing compartment and improving the humidity in the freezing compartment. The invention increases the humidity in the freezing chamber before the refrigerating and freezing device stops. After the machine is stopped, the humidity in the freezing chamber is not reduced and even rises slowly, so that the higher humidity in the freezing chamber can be maintained during the machine stopping period, the average humidity in the freezing chamber is improved, and the phenomenon that the food preservation effect is influenced due to lower humidity in the freezing chamber is avoided.

In addition, the invention presets a lower preset frequency according to experience, so that the running frequency of the compressor is constant during humidification, and only the duration of running the compressor at the preset frequency is monitored, thereby simplifying control logic.

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 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, the refrigerating and freezing apparatus 1 of the present invention includes a cabinet 10 defining a freezing compartment 11, a freezing blower 31 for driving air supply into the freezing compartment 11, and a compression refrigeration system 20, and the compression refrigeration system 20 includes a compressor 21, a condenser 29 connected in series with the compressor 21, a freezing evaporator 22, and a freezing throttle 23. The freezing evaporator 22 and the freezing throttle 23 form a freezing branch. Specifically, the freeze-throttle 23 may be a capillary tube, a throttle valve, or the like.

The inventors have recognized that during refrigeration of the freezer compartment, the evaporator temperature of the freezer evaporator 22 must be lower than the compartment temperature of the freezer compartment 11 to have the ability to cool the freezer compartment 11. Whereas water vapor typically collects and condenses at lower temperatures. Therefore, during the refrigeration of the freezer compartment, moisture in the freezer compartment 11 may condense at the freezer evaporator 22, and the humidity in the freezer compartment 11 necessarily decreases. When the temperature in the freezer compartment 11 reaches the set temperature and stops, the temperature in the freezer compartment 11 almost reaches a minimum, which will lower the average humidity of the freezer compartment. Although the humidity in the freezing compartment 11 increases slowly after the machine is stopped, the rate of humidity increase is slow, and the food material in the freezing compartment 11 is still in a low humidity environment for a long time, and the preservation quality is poor.

The applicant further conceived that if the operating frequency of the compressor 21 is lowered to a certain lower frequency than the first set frequency of the compressor 21 in the refrigerating state of the freezing compartment, the temperature of the freezing evaporator 22 is raised to be higher than the temperature of the freezing compartment 11, and then moisture is accumulated in the freezing compartment 11, by which the freezing compartment 11 can be effectively moisturized or the humidity in the freezing compartment 11 can be increased.

Based on the above knowledge, the present invention provides a control method of a refrigerating and freezing apparatus, comprising:

when the refrigerating and freezing apparatus 1 reaches a preset auto-off condition, the freezing blower 31 is controlled to be in a stopped state, the refrigerant is controlled to flow through the freezing throttle 23 and the freezing evaporator 22, and the compressor 21 is controlled to operate at a preset frequency. Wherein the preset frequency is set such that the evaporator temperature of the freezing evaporator 22 is higher than the compartment temperature within the freezing compartment 11;

when the duration of the operation of the compressor 21 at the preset frequency reaches the first preset duration, stopping the operation of the compressor 21 and starting the refrigerating fan 31;

and stopping the freezing blower 31 after the freezing blower 31 is continuously operated for a second preset period of time.

The control method of the present invention empirically presets a lower preset frequency at which the evaporator temperature of the freeze evaporator 22 is higher than the compartment temperature in the freezer compartment 11 when the compressor 21 is operating. The compressor 21 is not immediately stopped when the refrigerating and freezing apparatus 1 reaches a preset automatic shutdown condition, but the freezing blower 31 is stopped first, and the compressor 21 is stopped after the compressor 21 is operated at the above-mentioned preset frequency for a first preset period of time. At this time, the temperature of the freezing evaporator 22 has risen to at least a temperature higher than that of the freezing compartment 11, and then the air flow is caused to circulate between the freezing evaporator 22 and the freezing compartment 11 by activating the freezing blower 31, so that the outside moisture entering the freezing compartment 11 through the door seal, the moisture in the freezing compartment 11 (such as the moisture volatilized from the food material), and the moisture formed by sublimation of the frost on the freezing evaporator 22 are condensed in the freezing compartment having a lower temperature rather than at the freezing evaporator, thereby effectively increasing the moisture content in the freezing compartment 11 and the humidity in the freezing compartment 11.

The present invention increases the humidity in the refrigerating compartment 11 before the refrigerating and freezing apparatus 1 is stopped. After the machine is stopped, the humidity in the freezing chamber 11 is not reduced, and even the humidity is slowly increased, so that the higher humidity in the freezing chamber 11 can be maintained during the machine stopping period, the average humidity in the freezing chamber 11 is improved, and the influence on the preservation effect of food due to the lower humidity in the freezing chamber 11 is avoided.

In addition, the invention presets a lower preset frequency according to experience, so that the running frequency of the compressor is constant during humidification, and only the duration of running the compressor 21 at the preset frequency is required to be monitored, thereby simplifying control logic.

Meanwhile, as long as the evaporator temperature of the freezing evaporator 22 is higher than the room temperature in the freezing room 11 by a certain value, the freezing blower 31 can humidify the freezing room 11 when operated. Therefore, in the present invention, after the compressor 21 operates at the preset frequency for the first preset period of time, the freezing blower 31 is started and the operation time of the freezing blower 31 is limited to a certain extent, so that not only can the humidity in the freezing compartment 11 be effectively increased, but also the air flow with slightly higher temperature formed after passing through the freezing evaporator 22 is not blown to the freezing compartment 11 for a long time, so that the temperature of the freezing compartment 11 is obviously raised.

The control method of the invention regulates the humidity in the freezing compartment 11 before stopping, does not need to start the compressor 21 again for humidification operation after stopping, and avoids damage to the compressor 21 caused by frequent start and stop.

The invention realizes the purpose of improving the humidity in the refrigerating compartment 11 by controlling the running time of the refrigerating fan 31 and the compressor 21 on the basis of the original structure of the refrigerating and freezing device 1 without adding any auxiliary structure, thereby having no influence on the original structure and storage capacity of the refrigerating and freezing device 1 and improving the feasibility of practical application.

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, judging whether the refrigerating and freezing device 1 reaches a preset automatic shutdown condition; if yes, go to step S20, if not, return to and continue to judge;

step S20, controlling the refrigerating fan 31 to be in a stopped state, controlling the refrigerant to flow through the refrigerating throttle device 23 and the refrigerating evaporator 22, and controlling the compressor 21 to operate at a preset frequency;

step S30, judging whether the time of the compressor 21 running at the preset frequency reaches the first preset duration; if yes, go to step S40, if not, return to and continue to judge;

step S40, stopping the operation of the compressor 21 and starting the freezing blower 31;

step S50, judging whether the continuous running time of the refrigerating fan 31 reaches a second preset time length; if yes, go to step S60, if no, return to and continue to judge;

step S60, stopping the freezing blower 31.

In some embodiments, the predetermined frequency is 20 to 90 hertz lower than the first set frequency of the compressor 21 in the refrigerating state of the refrigerating compartment. For example, the predetermined frequency may be 20 hz, 30 hz, 40 hz, 50 hz, 60 hz, 70 hz, 80 hz, or 90 hz lower than the first set frequency.

Specifically, when the refrigerating and freezing apparatus 1 is in the refrigerating compartment refrigeration state, the compressor 21 is operated at the first set frequency. When the refrigerating and freezing apparatus 1 reaches the auto-off condition, the compressor 21 is operated at a preset frequency lower than the first preset frequency by 20 to 90 hz, and it is ensured that the evaporator temperature of the freezing evaporator 22 is higher than the compartment temperature of the freezing compartment 11.

It can be appreciated that the value of the preset frequency is not easily too low nor too high. The preset frequency is too low, the evaporator temperature of the freezing evaporator 22 is too high, and when the freezing blower 31 operates, the air flow with higher temperature is blown to the freezing compartment 11, so that the temperature of the freezing compartment 11 is obviously raised, and the preservation effect of food materials is affected. The preset frequency is too high, the evaporator temperature of the freezing evaporator 22 is too low, and the evaporator temperature cannot be ensured to be higher than the temperature of the freezing compartment 11, so that the freezing compartment 11 cannot be effectively humidified.

In some embodiments, the first preset duration may be any duration value ranging from 1 to 10 minutes. For example, the first preset time period may be 1min, 2min, 3min, 4min, 5min, 6min, 7min, 8min, 9min, or 10min.

The compressor 21 is operated at a preset frequency for 1 to 10 minutes, and it is ensured that the evaporator temperature of the freezing evaporator 22 is raised to be higher than the temperature of the freezing compartment 11, thereby effectively humidifying the freezing compartment 11 when the freezing blower 31 is started to operate. If the duration of the operation of the compressor 21 at the preset frequency is too short, the evaporator temperature of the freezing evaporator 22 may not be raised yet, and if the duration of the operation of the compressor 21 at the preset frequency is too long, energy consumption is wasted.

In some embodiments, at least one non-freezing compartment is further defined in the case 10, and at least one non-freezing branch for providing cold to the at least one non-freezing compartment is connected in parallel to both ends of the freezing and throttling device 23, and the compression refrigeration system 20 further includes a switching valve 24 for conducting one of the freezing and throttling device 23 and the at least one non-freezing branch.

For example, the at least one non-refrigerated compartment may comprise a refrigerated compartment 12, the at least one non-refrigerated leg may comprise a refrigerated leg for providing refrigeration to the refrigerated compartment 12, the refrigerated leg comprising a refrigerated evaporator 25 and a refrigerated throttle 26 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.

When the refrigerating compartment 11, the refrigerating compartment 12, and the temperature changing compartment 13 are defined in the cabinet 10 at the same time, the refrigerating and freezing apparatus 1 generally operates in the order of refrigerating compartment cooling, temperature changing compartment cooling, and refrigerating compartment cooling. Namely, when the refrigeration of the refrigerating compartment begins, the refrigeration of the refrigerating compartment and the refrigeration of the temperature-changing compartment are usually carried out; that is, the refrigerating and freezing apparatus 1 is generally in a refrigerating compartment refrigerating state before the auto-off condition is reached. It will be appreciated that in the refrigerating state of the refrigerating compartment 11, the refrigerating fan 31 is in an operating state, and the switching valve 24 is in a state of turning on the refrigerating throttle device 23, so that the refrigerant flows through the refrigerating throttle device 23 and the refrigerating evaporator 22, thereby achieving the purpose of refrigerating the refrigerating compartment 11.

In these embodiments, the step S30 of controlling the flow of the refrigerant through the refrigeration throttle 23 and the refrigeration evaporator 22 may specifically include:

the state of the switching valve 24 is kept unchanged.

The step of controlling the freezing blower 31 to be in a stopped state includes:

the freezing blower 31 is stopped.

That is, before the automatic shutdown condition is reached, the refrigerating and freezing apparatus 1 is in the refrigerating compartment cooling state, the switching valve 24 is already in the state of turning on the refrigerating throttle device 23, and the refrigerating fan 31 is in the operating state. Therefore, after the automatic shutdown condition is reached, the state of the switching valve 24 does not need to be changed any more, and only the freezing blower 31 needs to be stopped.

In other embodiments, the refrigeration and freezer 1 may be in a non-refrigerated compartment cooling state, such as a refrigerated or variable temperature cooling state, prior to reaching the auto-off condition. In the non-freezing compartment cooling state, the freezing blower 31 is stopped, no air is supplied to the freezing compartment 11, the switching valve 24 is in a state of conducting the corresponding non-freezing branch, and no refrigerant flows through the freezing throttle 23.

In these embodiments, the step S30 of controlling the flow of the refrigerant through the refrigeration throttle 23 and the refrigeration evaporator 22 may specifically include:

the switching valve 24 is switched to a state in which the refrigeration throttle 23 is turned on.

The step of controlling the freezing blower 31 to be in a stopped state includes:

the stopped state of the freezing blower 31 is maintained unchanged.

That is, when the refrigerating and freezing apparatus 1 is in the non-freezing compartment cooling state before the automatic shutdown condition is reached, the freezing blower 31 is already in the stopped state, and the switching valve 24 is turned on to the non-freezing branch. Therefore, after the automatic shutdown condition is reached, the state of the freezing blower 31 is not changed, and only the state of the switching valve 24 is adjusted to be in a state of turning on the freezing and throttling device 23 so as to adjust the evaporator temperature of the freezing evaporator 22.

In some embodiments, the second preset time period may be any time period value ranging from 3 to 10 minutes. For example, the second preset duration may be 3min, 4min, 5min, 6min, 7min, 8min, 9min, or 10min. The second preset time period is too small, namely the running time of the refrigerating fan 31 is too short, and the humidifying effect in the refrigerating compartment 11 is not obvious; an excessive value of the second preset time period, i.e., an excessive operation time of the freezing blower 31, may cause the temperature in the freezing compartment 11 to rise significantly. Therefore, the second preset time length is set to any time length value ranging from 3 minutes to 10 minutes, so that the freezing compartment 11 can be effectively humidified, and the temperature in the freezing compartment 11 can be prevented from generating larger fluctuation.

In some embodiments, the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing apparatus 1 reaches its respective set temperature.

Specifically, if the refrigerating and freezing apparatus 1 includes only the freezing compartment 11, the automatic shutdown condition is that the freezing compartment 11 reaches the freezing set temperature.

Specifically, if the refrigerating and freezing apparatus 1 includes at least one non-freezing compartment other than the freezing compartment 11, for example, a refrigerating compartment 12 and a temperature changing compartment 13, the automatic shutdown condition is that the refrigerating compartment 12 reaches a refrigerating set temperature, the temperature changing compartment 13 reaches a temperature changing set temperature, and the freezing compartment 11 reaches a freezing set temperature.

The present invention also provides a refrigerating and freezing apparatus, and fig. 4 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 4, the refrigerating and freezing apparatus 1 of the present invention includes a cabinet 10 defining a freezing compartment 11, a freezing fan 31 for driving air supply into the freezing compartment 11, and a compression refrigeration system 20. The compression refrigeration system 20 includes a compressor 21, a refrigeration evaporator 22 connected in series with the compressor 21, and a refrigeration throttle 23.

In particular, the refrigerating and freezing apparatus 1 further comprises a control device 40, the control device 40 comprises a processor 41 and a memory 42, the memory 42 stores a machine executable program 43, and the machine executable program 43 is used to implement the control method described in any of the above embodiments when executed by the processor 41.

Specifically, the compressor 21 and the freezing blower 31 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 refrigerating and freezing apparatus 1 of the present invention increases the humidity in the freezing compartment 11 before stopping the operation. After the machine is stopped, the humidity in the freezing chamber 11 is not reduced, and even the humidity is slowly increased, so that the higher humidity in the freezing chamber 11 can be maintained during the machine stopping period, the average humidity in the freezing chamber 11 is improved, and the influence on the preservation effect of food due to the lower humidity in the freezing chamber 11 is avoided.

In addition, the invention presets a lower preset frequency according to experience, so that the running frequency of the compressor is constant during humidification, and only the duration of running the compressor 21 at the preset frequency is required to be monitored, thereby simplifying control logic.

Meanwhile, as long as the evaporator temperature of the freezing evaporator 22 is higher than the room temperature in the freezing room 11 by a certain value, the freezing blower 31 can humidify the freezing room 11 when operated. Therefore, in the present invention, after the compressor 21 operates at the preset frequency for the first preset period of time, the freezing blower 31 is started and the operation time of the freezing blower 31 is limited to a certain extent, so that not only can the humidity in the freezing compartment 11 be effectively increased, but also the air flow with slightly higher temperature formed after passing through the freezing evaporator 22 is not blown to the freezing compartment 11 for a long time, so that the temperature of the freezing compartment 11 is obviously raised.

The control method of the invention regulates the humidity in the freezing compartment 11 before stopping, does not need to start the compressor 21 again for humidification operation after stopping, and avoids damage to the compressor 21 caused by frequent start and stop.

In some embodiments, at least one non-freezing compartment is further defined in the case 10, and at least one non-freezing branch for providing cold to the at least one non-freezing compartment is connected in parallel to both ends of the freezing and throttling device 23, and the compression refrigeration system 20 further includes a switching valve 24 for conducting one of the freezing and throttling device 23 and the at least one non-freezing branch. The switching valve 24 is configured to controllably maintain or switch to a state of turning on the refrigeration throttle 23 when the refrigeration chiller 1 reaches a preset auto-off condition.

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 refrigerating and freezing device, the refrigerating and freezing device comprising a box body defining a freezing compartment, a freezing fan for driving air supply into the freezing compartment, and a compression refrigerating system, the compression refrigerating system comprising a compressor, a freezing evaporator and a freezing throttling device connected in series with the compressor; the control method comprises the following steps:

when the refrigeration and freezing device reaches a preset automatic shutdown condition, controlling the refrigerating fan to be in a stop state, controlling the refrigerant to flow through the refrigeration throttling device and the refrigeration evaporator, and controlling the compressor to run at a preset frequency, wherein the preset frequency is set so that the evaporator temperature of the refrigeration evaporator is higher than the compartment temperature in the refrigeration compartment;

stopping the operation of the compressor and starting the refrigerating fan when the operation time of the compressor at the preset frequency reaches a first preset time;

and stopping the refrigerating fan after the refrigerating fan continuously operates for a second preset time.

2. The control method according to claim 1, wherein,

the preset frequency is 20-90 Hz lower than the first set frequency of the compressor in the refrigerating state of the refrigerating compartment.

3. The control method according to claim 1, wherein,

the first preset duration is any duration value ranging from 1 to 10 minutes.

4. The control method according to claim 1, wherein at least one non-freezing compartment is further defined in the case, at least one non-freezing branch for providing cold to the at least one non-freezing compartment is connected in parallel to both ends of the freezing and throttling device, and the compression and refrigerating system further comprises a switching valve for switching on one of the freezing and throttling device and the at least one non-freezing branch;

before the automatic shutdown condition is reached, the refrigerating and freezing device is in a refrigerating chamber refrigerating state, and the refrigerating fan is in an operating state in the refrigerating chamber refrigerating state; and is also provided with

The step of controlling the flow of refrigerant through the refrigeration throttle and the refrigeration evaporator comprises:

maintaining the state of the switching valve unchanged;

the step of controlling the refrigerating fan to be in a stop state comprises the following steps:

stopping the refrigerating fan.

5. The control method according to claim 1, wherein at least one non-freezing compartment is further defined in the case, at least one non-freezing branch for providing cold to the at least one non-freezing compartment is connected in parallel to both ends of the freezing and throttling device, and the compression and refrigerating system further comprises a switching valve for switching on one of the freezing and throttling device and the at least one non-freezing branch;

before the automatic shutdown condition is reached, the refrigeration and freezing device is in a non-refrigeration compartment refrigeration state, and the refrigerating fan is in a stop state in the non-refrigeration compartment refrigeration state; and is also provided with

The step of controlling the flow of refrigerant through the refrigeration throttle and the refrigeration evaporator comprises:

switching the switching valve to a state of conducting the refrigeration throttling device;

the step of controlling the refrigerating fan to be in a stop state comprises the following steps:

and keeping the stop state of the refrigerating fan unchanged.

6. The control method according to claim 4 or 5, 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 capillary tube 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 capillary and a temperature change evaporator connected in series.

7. The control method according to claim 1, wherein,

the second preset time length is any time length value ranging from 3min to 10min.

8. The control method according to claim 1, wherein,

the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device reaches the respective set temperature.

9. A refrigeration and freezing apparatus comprising a cabinet defining a freezer compartment, a refrigeration fan for driving air into the freezer compartment, and a compression refrigeration system comprising a compressor, a refrigeration evaporator connected in series with the compressor, and a refrigeration and throttling device, the refrigeration and freezing apparatus further comprising:

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 1-8.

10. The refrigeration and freezer of claim 9 wherein,

the compression refrigeration system further comprises a switching valve used for conducting one of the freezing throttling device and the at least one non-freezing branch; wherein the method comprises the steps of

The switching valve is configured to controllably maintain or switch to a state in which the refrigeration and freezer is turned on when the refrigeration and freezer reaches a preset auto-off condition.