CN108168189A - Refrigerating device and its control method - Google Patents

Abstract

The present invention relates to a kind of refrigerating device and its control methods.The control method of the present invention includes：In the moment that door body is opened, the bright state of the indoor each layer storage space of refrigerator is obtained；After door body closing and before the indoor light source extinguishing of refrigerator, the bright state of the indoor each layer storage space of refrigerator is obtained again；The bright state that every layer of storage space obtains twice after door body opens moment and door body is closed is compared, whether is changed with the storing state for determining this layer of storage space；If variation this layer of storage space of instruction that the storing state of this layer of storage space occurs has been put into new article, judge the temperature in this layer of storage space whether higher than the first preset temperature threshold；And if air outlet corresponding with this layer of storage space is connected to supply air duct by the temperature in this layer of storage space higher than the first preset temperature threshold.Hereby it is achieved that layering accurate air-feeding, improves refrigeration effect and refrigerating efficiency.

Description

Refrigerating and freezing device and control method thereof

technical field

The invention relates to household electrical appliances, in particular to a refrigerating and freezing device and a control method thereof.

Background technique

Existing refrigerating and freezing devices usually have a plurality of storage compartments, and the storage environments of each storage compartment are different, and the required cooling capacity is also different. Therefore, in the prior art, each storage compartment is usually The air volume is distributed in different rooms to achieve the purpose of different storage environments.

For the same storage compartment, there is no difference in the air volume delivery in different areas. However, a plurality of shelves are usually arranged in the storage compartment (especially the refrigerated compartment), thereby forming a multi-layer storage space. According to the user's personal preferences and actual needs, the storage conditions of each storage space will be different, but the air volume is the same, so the cooling capacity contained in the cooling airflow is not fully utilized, and the cooling effect in the storage space Poor, slow cooling rate.

Contents of the invention

An object of the first aspect of the present invention is to overcome at least one defect in the prior art, and provide a control method for a refrigerating and freezing device capable of precise air supply and rapid cooling.

A further object of the first aspect of the present invention is to ensure that the temperature of the storage space to be refrigerated can be cooled as quickly as possible no matter what the operating state of the refrigerating and freezing device is.

Another further object of the first aspect of the present invention is to increase the accuracy and precision with which temperature values are obtained.

The object of the second aspect of the present invention is to provide a refrigerating and freezing device.

According to the first aspect of the present invention, the present invention provides a control method for a refrigerating and freezing device, the refrigerating and freezing device includes a box body and a door body, the box body defines a refrigerated compartment and a The air supply duct for conveying the cooling air flow, the refrigerated compartment has a multi-layer storage space, the door body is connected to the box to open and/or close the refrigerated compartment, and the control method includes:

At the moment when the door body is opened, obtain the light state of each layer of storage space in the refrigerated compartment;

After the door body is closed and before the light source in the refrigerated compartment is extinguished, the light status of each layer of storage space in the refrigerated compartment is acquired again;

Comparing the light states acquired twice at the moment when the door body is opened and after the door body is closed for each layer of the storage space to determine whether the storage state of the storage space on the layer has changed;

If the change in the storage state of the storage space on the floor indicates that a new item is placed in the storage space on the floor, it is determined whether the temperature in the storage space on the floor is higher than a first preset temperature threshold; and

If the temperature in the storage space of the floor is higher than the first preset temperature threshold, the air supply port corresponding to the storage space of the floor is connected to the air supply duct.

Optionally, a freezer compartment is also defined in the box, and the refrigerating and freezing device is a dual-system refrigerator, wherein, in "connecting the air supply port corresponding to the storage space on this floor to the air supply duct" After the operation, the control method also includes:

When the refrigerating and freezing device is in the refrigerating and refrigerating state, the refrigerating fan of the refrigerating and freezing device is urged to operate at 70% to 100% of its maximum rotational speed until the temperature in the storage space of this layer is lower than the first preset The temperature threshold or the refrigerating and freezing device exits the refrigerating and refrigerating state.

Optionally, after the operation of "connecting the air supply port corresponding to the storage space on this floor to the air supply duct", the control method further includes:

When the refrigerating and freezing device is in the refrigerating and refrigerating state or the compressor is stopped, the rotational speed of the refrigerating fan is set to 40% to 60% of the maximum rotational speed until the refrigerating and freezing device is switched to the refrigerating and refrigerating state.

Optionally, after the door body is closed and before "judging whether the temperature in the storage space on this floor is higher than the first preset temperature threshold", the control method further includes:

The temperature in the storage space of the layer is obtained after a delay of the first preset time period.

Optionally, the operation of "obtaining the temperature in the storage space of this layer" includes:

The temperature in the storage space of the layer is periodically detected multiple times, and the average value of the temperature measured multiple times is taken as the acquired temperature in the storage space of the layer.

Optionally, when the absolute value of the temperature difference in the storage space of the layer measured twice adjacently exceeds the preset temperature difference threshold, the temperature in the storage space of the layer measured later in time is discarded. temperature value.

Optionally, an air volume distributor is provided in the air supply duct, wherein the operation of "connecting the air supply opening corresponding to the storage space on this floor to the air supply duct" includes: connecting the air volume distributor The air outlet is aligned with the air supply outlet corresponding to the storage space of this layer.

Optionally, the light state at least includes light intensity and/or light source direction;

The storage status includes at least storage amount and/or item position.

Optionally, the light source is set to be turned off after a delay of a second preset time period after the door body is closed.

According to a second aspect of the present invention, the present invention also provides a refrigerating and freezing device, comprising:

The box body defines a refrigerated compartment and an air supply duct for delivering cooling airflow to the refrigerated compartment, and the refrigerated compartment has a multi-layer storage space;

a door connected to the box to open and/or close the refrigerated compartment;

The photosensitive component is configured to controlly obtain the light of each storage space in the refrigerated compartment at the moment when the door is opened, and after the door is closed and before the light source in the refrigerated compartment is turned off. state;

a temperature acquisition component, configured to acquire the temperature in the storage space on each floor; and

The control device is configured to compare the light states acquired twice at the moment when the door body is opened and after the door body is closed, so as to determine whether the storage state of the storage space on the layer has changed, and When the change of the storage state of the storage space on this floor indicates that a new item has been put into the storage space on this floor, and the temperature in the storage space on this floor is higher than the first preset temperature threshold, it will be connected with the storage on this floor. The air supply port corresponding to the space is connected to the air supply duct.

The control method of the refrigerating and freezing device of the present invention determines whether the storage state of the storage space on the floor changes before and after the door is opened by comparing the light states obtained twice at the moment when the door body is opened and after the door body is closed. , and when the storage state of the storage space of this layer changes (for example, a new warm item is put in), the storage space of this layer is determined by comparing whether the temperature in the storage space of this layer exceeds the first preset temperature threshold Whether the space needs to be refrigerated, if it needs to be refrigerated, connect the air supply port corresponding to the storage space of this layer to the air supply duct, so that the cooling air flow in the air supply duct can be sent into the storage space of this layer through the air supply port , while the storage state does not change or changes but does not require cooling, the corresponding air supply port of the storage space may not be connected with the air supply duct, so that the cooling airflow can be concentrated in the storage space that needs cooling, thereby realizing precise air supply , improve the refrigeration effect and refrigeration efficiency, and achieve the purpose of rapid cooling.

Further, when the refrigerating and freezing device is a dual-system refrigerator, the present invention also controls the rotational speed of the refrigerating fan according to the different operating states of the refrigerating and freezing device, so that no matter what operating state the refrigerating and freezing device is in before and after the door is opened, it can be guaranteed The layer or layers of storage spaces that need to be cooled can cool down as quickly as possible, which improves the user experience.

Further, the control method of the present invention obtains the temperature in the storage space where the storage state changes after a delay of the first preset period of time after the door is closed, therefore, it can ensure that the obtained temperature is more accurate and closer to actual temperature in the storage space.

Further, the present invention obtains the temperature in the storage space where the storage state changes by taking the average value of multiple detections, and compares the absolute value of the temperature difference measured twice adjacently with the preset temperature difference threshold To avoid the problem of inaccurate temperature values caused by sudden changes in two adjacent measurement values, and improve the accuracy and accuracy of temperature acquisition.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic structural diagram of a refrigerating and freezing device according to one embodiment of the present invention;

Fig. 2 is a partial structural schematic diagram of a refrigerating and freezing device according to an embodiment of the present invention;

Fig. 3 is a schematic flowchart of a control method of a refrigerating and freezing device according to an embodiment of the present invention.

Detailed ways

The invention provides a refrigerating and freezing device and a control method thereof. Fig. 1 is a schematic structural diagram of a refrigerating and freezing device according to an embodiment of the present invention, and Fig. 2 is a partial structural diagram of the refrigerating and freezing device according to an embodiment of the present invention. The refrigerating and freezing device 1 of the embodiment of the present invention includes a box body 10 and a door body 20 . The box body 10 defines a refrigerated compartment 110 and an air supply duct (not shown) for delivering cooling airflow to the refrigerated compartment 110 , and the air supply duct may be located behind the refrigerated compartment 110 . An evaporator for providing cooling airflow and a fan for driving the airflow to circulate may be arranged in the air supply duct.

There are multiple storage spaces in the refrigerated compartment 110 . Specifically, the refrigerated compartment 110 may be provided with n horizontally arranged shelves 130 arranged up and down, so as to divide the space in the refrigerated compartment 110 into n+1 storage spaces. In the embodiment shown in Fig. 1 and Fig. 2, the number of shelves 130 is three, which divides the space in the refrigerated compartment 110 into top storage space 111, middle and upper storage space arranged in sequence from top to bottom. The space 112 , the middle lower storage space 113 and the bottom storage space 114 are four storage spaces.

The door body 20 is connected to the box body 10 to open and/or close the refrigerated compartment 110 . A light source can also be provided in the refrigerated compartment 110 , and the light source is turned on when the door body 20 is opened, so that the user can check the articles or storage status in the refrigerated compartment 110 . After the door body 20 is closed, the light source is turned off to save energy consumption. Specifically, the light source may be a surface light source 115 arranged on the rear wall of the refrigerated compartment 110, so that the radiation of the light source in each storage space in the refrigerated compartment 110 is more balanced.

The inventors of the present application creatively realized that every time the door body 20 is opened, the storage conditions of the articles in the storage spaces of each layer may change, for example, the user may put in new articles or take them out from the storage spaces. Items, it may also just change the position of the items in the storage space. Whether putting in a new item, taking out an item, or changing the position of an item will affect or change the light state of the storage space of the relevant layer. Therefore, the change of the storage state in each storage space can be perceived by comparing the light state of each storage space before and after the door body 20 is opened.

Based on the above knowledge, the refrigerating and freezing device 1 of the present invention particularly includes a photosensitive component 30, which is configured to be controlled to control the light at the moment the door 20 is opened and after the door 20 is closed and before the light source in the refrigerated compartment 110 is turned off. The light status of each layer of storage space in the refrigerated compartment 110 is acquired. That is to say, at the moment when the door body 20 is opened, the photosensitive component will acquire the light status of each storage space in the refrigerated compartment 110 in a controlled manner. After the door body 20 is closed and before the light source in the refrigerated compartment 110 is turned off, the photosensitive component will controlly acquire the light status of each storage space in the refrigerated compartment 110 again.

It should be noted that the "light state" mentioned in the present invention includes at least light intensity and/or light source direction, and may also include other relevant parameters that can indicate or reflect changes in the storage state in the storage space. The "storage state" mentioned in the present invention includes at least the storage amount and/or the location of the items, and may also include other relevant parameters that can indicate or reflect the decrease or increase of the items in the storage space.

Further, the refrigerating and freezing device 1 further includes a temperature acquisition component 40 and a control device 50 . The temperature acquiring component 40 is used to acquire the temperature in each storage space. The control device 50 is configured to compare the light states acquired twice at the moment when the door body 20 is opened and after the door body 20 is closed for each layer of the storage space to determine whether the storage state of the storage space of the layer has changed, and then A change in the storage status of a floor storage space indicates that a new item has been placed in the floor storage space, and when the temperature in the floor storage space is higher than the first preset temperature threshold, it will correspond to the floor storage space The air supply port is connected to the air supply duct. The first preset temperature threshold is commonly referred to as the refrigerating start-up point temperature, and the refrigerating start-up point temperature set by different users will be different.

Specifically, the light sensor assembly 30 may include a first light sensor 31 disposed at the rear of the door body 20 and vertically between the top storage space 111 and the middle and upper storage space 112 and a first light sensor 31 disposed on the door body 20. and the second light sensor 32 between the middle and lower storage space 113 and the bottom storage space 114 in the vertical direction, so as to detect the light state in each storage space. The temperature acquisition component 40 may include temperature sensors, such as infrared sensors 41 , arranged in the storage spaces of each layer.

In some embodiments of the present invention, the light source is set to be turned off after a delay of a second preset time period after the door body 20 is closed. In this way, it can be ensured that the light source can be turned on for a period of time after the door body 20 is closed, so that the photosensitive component 30 can obtain the light status of the storage spaces on each floor after the door body 20 is closed. Specifically, the second preset duration may be 1s.

The invention also provides a control method of the refrigerating and freezing device. Fig. 3 is a schematic flowchart of a control method of a refrigerating and freezing device according to an embodiment of the present invention. This control method includes:

At the moment when the door body 20 is opened, obtain the light state of each storage space in the refrigerated compartment 110;

After the door body 20 is closed and before the light source in the refrigerated compartment 110 is extinguished, the light status of each storage space in the refrigerated compartment 110 is acquired again;

Comparing the light states acquired twice at the moment when the door body 20 is opened and after the door body 20 is closed for each layer of storage space, to determine whether the storage state of the layer of storage space changes;

If the change in the storage state of the storage space on the floor indicates that a new item is placed in the storage space on the floor, it is determined whether the temperature in the storage space on the floor is higher than a first preset temperature threshold; and

If the temperature in the storage space of the floor is higher than the first preset temperature threshold, the air supply port corresponding to the storage space of the floor is connected to the air supply duct.

The control method of the present invention determines whether the storage state of the storage space of the layer changes before and after the opening of the door body 20 by comparing the light state acquired twice at the moment when the door body 20 is opened and after the door body 20 is closed. And when the storage state of the storage space of this layer changes, it is determined whether the storage space of this layer needs to be refrigerated by comparing whether the temperature in the storage space of this layer exceeds the first preset temperature threshold. The air supply opening corresponding to the storage space on this floor is connected to the air supply duct. As a result, the cooling airflow in the air supply duct can be sent into the storage space of this layer through the air supply port, and the air supply port corresponding to the storage space that does not change the storage state or changes but does not need cooling may not be connected with the supply air. In this way, the cooling airflow can be concentrated in the storage space that needs to be refrigerated, thereby realizing precise air supply, improving the cooling effect and efficiency, and achieving the purpose of rapid cooling.

The control process of the present invention will be described in detail below by taking only warm items newly placed in the storage space 112 in the middle and upper layers as an example.

When the user opens the door body 20, the light sensing component 30 acquires and stores the light state in the middle and upper storage space 112. When the user puts warm items with a temperature higher than the refrigerated temperature into the upper-middle level items, closes the door 20 and before the light source goes out, the photosensitive component 30 acquires the light state in the upper-middle level storage space 112 again. Comparing the light states obtained twice, it is found that after the door body 20 is closed, the light sources in some areas in the middle and upper storage space 112 are blocked, and the light levels in some areas are weakened. Based on the comparison result, the control device 50 determines that a new item has been placed in the middle and upper storage space 112 . Then, compare whether the temperature in the middle and upper storage space 112 is higher than the first preset temperature threshold, if so, then determine that the item put in is a warm item whose temperature is higher than the refrigerated temperature. The space 112 is refrigerated, and the air supply port corresponding to the middle and upper storage space 112 is connected to the air supply duct.

In the above process, the photosensitive component 30 will also obtain the light state in the storage space of other layers at the same time, and find that the light state in the storage space of other layers has not changed, that is, it is determined that no new light is placed in the storage space of other layers. items, and no items were removed from them. At this time, the temperature in the storage space of other layers may not be judged.

In other cases, for example, when the user takes out an item from the middle and upper storage space 112, the light states obtained by the light sensing component 30 twice will also be different. After the door body 20 is closed, some light sources in the middle and upper storage space 112 The light source is detected again in the blocked area, and the brightness of some areas is enhanced. Based on the comparison result, the control device 50 determines that the user has taken out the item from the storage space 112 in the middle and upper layers, and at this time, the temperature in the storage space of other layers may not be judged.

In some embodiments of the present invention, a freezer compartment 120 is defined inside the box body 10, and the refrigerating and freezing device 1 may be a dual-system refrigerator. That is to say, in addition to the compressor and the condenser, the refrigerating and freezing device 1 also includes a refrigerating evaporator, a refrigerating fan, a freezing evaporator, a refrigerating fan, and a solenoid valve for switching the flow of the refrigerant to the refrigerating evaporator or the freezing evaporator. The refrigeration of the refrigerating compartment 110 and the freezing compartment 120 are independent of each other.

In these embodiments, after the operation of "connecting the air supply port corresponding to the storage space of this floor to the air supply duct", the control method of the present invention further includes: when the refrigerating and freezing device 1 is in the refrigerating and cooling state, prompting The refrigerating fan of the refrigerating and freezing device 1 operates at 70% to 100% of its maximum speed until the temperature in the storage space of this layer is lower than the first preset temperature threshold or the refrigerating and freezing device 1 exits the refrigerating and cooling state. When the temperature in the storage space of this layer is lower than the first preset temperature threshold or the refrigerating and freezing device 1 exits the refrigerating and cooling state, it can be controlled according to the specific operating state of the refrigerating and freezing device 1 whether the air supply port of the storage space on this layer is in line with the air supply. Air duct communication, and the speed of the refrigeration fan.

Specifically, when the temperature in the storage space on this floor is higher than the first preset temperature threshold to a certain extent (ie, too high), the refrigerating fan can operate at 90% to 100% of its maximum rotational speed. When the temperature in the storage space of this layer is slightly higher than the first preset temperature threshold and does not exceed a certain level, the refrigerating fan can operate at 70% to 90% of its maximum rotational speed.

Further, the control method of the present invention also includes: when the refrigerating and freezing device 1 is in the refrigerating and refrigerating state or the compressor is stopped, setting the rotational speed of the refrigerating fan to 40% to 60% of its maximum rotational speed until the refrigerating and freezing device 1 switches To refrigerated refrigeration state. For example, when the refrigerating-freezing device 1 is in the refrigerating state or the compressor is stopped, the refrigerating fan can be operated at 40%, 50% or 60% of its maximum rotational speed. When the refrigerating and freezing device 1 is switched to the refrigerating and cooling state, it is controlled according to the operation when the refrigerating and freezing device 1 is in the refrigerating and cooling state.

That is to say, when the refrigerating and freezing device 1 is a dual-system refrigerator, the present invention also controls the rotational speed of the refrigerating fan according to the different operating states of the refrigerating and freezing device 1, so that no matter what kind of operation the refrigerating and freezing device 1 is in before and after the door 20 is opened, state, it can ensure that the layer or layers of storage space that need to be cooled can cool down as quickly as possible, which improves the user experience.

In some embodiments of the present invention, after the door body 20 is closed and before "judging whether the temperature in the storage space of this floor is higher than the first preset temperature threshold", the control method of the present invention further includes:

The temperature in the storage space of the layer is obtained after a delay of the first preset time period.

That is to say, the control method of the present invention acquires the temperature in the storage space where the storage state changes after a delay of the first preset time period after the door body 20 is closed. Therefore, it can ensure that the acquired temperature is more accurate, It is closer to the actual temperature in the storage space of this layer.

Specifically, the first preset duration may be 2s, 3s, 4s or 5s.

Further, the operation of "obtaining the temperature in the storage space of this layer" may include:

The temperature in the storage space of the layer is periodically detected multiple times, and the average value of the temperature measured multiple times is taken as the acquired temperature in the storage space of the layer. When the absolute value of the temperature difference between the two consecutive measured temperatures in the storage space of the floor exceeds the preset temperature difference threshold, the temperature value in the storage space of the floor that is measured later in time is discarded.

That is to say, the present invention acquires the temperature in the storage space where the storage state changes by taking the average value of multiple detections, and uses the method of comparing the absolute value of the temperature difference measured twice adjacently with the preset temperature difference threshold. This method avoids the problem of inaccurate temperature values caused by sudden changes in two adjacent measurement values, and improves the accuracy and accuracy of temperature acquisition. Specifically, the aforementioned preset temperature difference threshold may be 0.5°C.

In some embodiments of the present invention, an air volume distributor is provided in the air supply duct, wherein the operation of "connecting the air supply opening corresponding to the storage space of this layer to the air supply duct" includes: connecting the air volume distributor The air outlet is aligned with the air supply outlet corresponding to the storage space of this layer. In some alternative embodiments of the present invention, an electronically controlled damper may be provided at the air supply opening of each storage space, wherein the "connect the air supply opening corresponding to the storage space of this floor to the air supply duct" The operation includes: opening the electronically controlled damper at the air supply outlet corresponding to the storage space on this floor. Since the structure of the air volume distributor and the electric damper is easily known to those skilled in the art, it will not be repeated here.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. 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 for a refrigerating and freezing device, the refrigerating and freezing device comprises a casing and a door body, the casing is defined with a refrigerated compartment and an air duct for delivering cooling airflow to the refrigerated compartment, There is a multi-layer storage space in the refrigerated compartment, and the door body is connected to the box to open and/or close the refrigerated compartment, wherein the control method includes: At the moment when the door body is opened, obtain the light state of each layer of storage space in the refrigerated compartment; After the door body is closed and before the light source in the refrigerated compartment is extinguished, the light status of each layer of storage space in the refrigerated compartment is acquired again; Comparing the light states acquired twice at the moment when the door body is opened and after the door body is closed for each layer of the storage space to determine whether the storage state of the storage space on the layer has changed; If the change in the storage state of the storage space on the floor indicates that a new item is placed in the storage space on the floor, it is determined whether the temperature in the storage space on the floor is higher than a first preset temperature threshold; and If the temperature in the storage space of the floor is higher than the first preset temperature threshold, the air supply port corresponding to the storage space of the floor is connected to the air supply duct. 2. The control method according to claim 1, wherein a freezer compartment is also defined in the box, and the refrigerating and freezing device is a dual-system refrigerator, wherein, in "will correspond to the storage space of this layer After the air supply port is connected to the air supply duct", the control method also includes: When the refrigerating and freezing device is in the refrigerating and refrigerating state, the refrigerating fan of the refrigerating and freezing device is urged to operate at 70% to 100% of its maximum rotational speed until the temperature in the storage space of this layer is lower than the first preset The temperature threshold or the refrigerating and freezing device exits the refrigerating and refrigerating state. 3. The control method according to claim 2, characterized in that, after the operation of "connecting the air supply port corresponding to the storage space on this floor to the air supply duct", the control method further comprises: When the refrigerating and freezing device is in the refrigerating and refrigerating state or the compressor is stopped, the rotational speed of the refrigerating fan is set to 40% to 60% of the maximum rotational speed until the refrigerating and freezing device is switched to the refrigerating and refrigerating state. 4. The control method according to claim 1, characterized in that, after the door is closed and before "judging whether the temperature in the storage space on this floor is higher than the first preset temperature threshold", the Control methods also include: The temperature in the storage space of the layer is obtained after a delay of the first preset time period. 5. The control method according to claim 4, wherein the operation of "obtaining the temperature in the storage space of this layer" comprises: The temperature in the storage space of the layer is periodically detected multiple times, and the average value of the temperature measured multiple times is taken as the acquired temperature in the storage space of the layer. 6. The control method according to claim 5, characterized in that, When the absolute value of the temperature difference between the two consecutive measured temperatures in the storage space of the floor exceeds the preset temperature difference threshold, the temperature value in the storage space of the floor that is measured later in time is discarded. 7. The control method according to claim 1, wherein an air volume distributor is provided in the air supply duct, wherein, "connect the air supply port corresponding to the storage space of this layer to the air supply air duct." The operation of "way" includes: aligning the air outlet of the air volume distributor with the air supply outlet corresponding to the storage space on this floor. 8. The control method according to claim 1, characterized in that, The light state includes at least light intensity and/or light source direction; The storage status includes at least storage amount and/or item position. 9. The control method according to claim 1, characterized in that, The light source is set to be turned off after a delay of a second preset time period after the door body is closed. 10. A refrigerating and freezing device, characterized in that, comprising: The box body defines a refrigerated compartment and an air supply duct for delivering cooling airflow to the refrigerated compartment, and the refrigerated compartment has a multi-layer storage space; a door connected to the box to open and/or close the refrigerated compartment; The photosensitive component is configured to controlly obtain the light of each storage space in the refrigerated compartment at the moment when the door is opened, and after the door is closed and before the light source in the refrigerated compartment is turned off. state; a temperature acquisition component, configured to acquire the temperature in the storage space on each floor; and The control device is configured to compare the light states acquired twice at the moment when the door body is opened and after the door body is closed, so as to determine whether the storage state of the storage space on the layer has changed, and When the change of the storage state of the storage space on this floor indicates that a new item has been put into the storage space on this floor, and the temperature in the storage space on this floor is higher than the first preset temperature threshold, it will be connected with the storage on this floor. The air supply port corresponding to the space is connected to the air supply duct.