WO2023231976A1 - Magnetic field freshness-preserving refrigerator and refrigeration control method therefor - Google Patents

Abstract

Provided are a magnetic field freshness-preserving refrigerator and a refrigeration control method therefor. The magnetic field freshness-preserving refrigerator comprises a refrigerator body internally defining a storage compartment; a refrigeration air channel for providing refrigeration airflow to the storage compartment; a refrigeration system used for generating refrigeration airflow; a magnetic field freshness-preserving device arranged in the storage compartment, the magnetic field freshness-preserving device being provided with an air inlet and an air return opening which are used for establishing communication with the refrigeration air channel to perform air cooling on a magnetic field freshness-preserving space. The refrigeration control method comprises: determining whether a state of the magnetic field freshness-preserving space meets a preset rapid refrigeration initiation condition; if yes, performing rapid refrigeration on the magnetic field freshness-preserving device until the state of the magnetic field freshness-preserving space meets a preset rapid refrigeration cessation condition; after rapid refrigeration of the magnetic field freshness-preserving device is completed, performing one or more phases of a transitional refrigeration procedure on the magnetic field freshness-preserving device; and after transitional refrigeration is completed, controlling the refrigeration system to normally refrigerate the magnetic field freshness-preserving device. The present solution can implement rapid and stable refrigeration of the magnetic field freshness-preserving device.

Description

Magnetic field fresh-keeping refrigerator and its refrigeration control method

This application claims the priority of the Chinese patent application with the filing date of May 30, 2022, the application number is 202210605316.8, and the invention name is "Magnetic field fresh-keeping refrigerator and its refrigeration control method", the entire content of which is incorporated into this application by reference. .

Technical field

The invention relates to refrigeration and freezing equipment, and specifically provides a magnetic field fresh-keeping refrigerator and a refrigeration control method thereof.

Background technique

Now research has found that magnetic fields can inhibit the growth of microorganisms and mold and extend the storage period of food. Therefore, magnetic fields can be used to assist in the storage of food ingredients, thereby extending the storage period of food ingredients.

In order to achieve fresh storage, the magnetic field needs to match the storage temperature. After actual testing, it is best to keep the storage temperature at 5-8 degrees Celsius without freezing, and the cooling rate needs to be relatively stable to minimize temperature fluctuations. On the other hand, after the magnetic field fresh-keeping device is opened or new storage items are put in, rapid cooling is required to reduce the storage temperature to a predetermined range.

However, in order to arrange the magnetic field components, the structure of the magnetic field preservation device is more complicated than that of ordinary storage devices. How to achieve rapid and stable cooling and cooling of the magnetic field preservation device has become an urgent problem that existing technology needs to solve.

Contents of the invention

An object of the present invention is to provide a magnetic field fresh-keeping refrigerator with a magnetic field fresh-keeping device capable of cooling and cooling quickly and stably.

A further object of the present invention is to make the temperature of the fresh-keeping space of the magnetic field fresh-keeping device uniform.

In order to achieve the above object, the present invention provides a refrigeration control method for a magnetic field fresh-keeping refrigerator. The magnetic field fresh-keeping refrigerator includes: a box internally defining a storage compartment; a refrigeration air duct that provides refrigeration airflow to the storage compartment; Refrigeration system for refrigeration air flow; a magnetic field fresh-keeping device arranged in the storage room. The magnetic field fresh-keeping device is provided with an air inlet and a return air outlet for connecting the refrigeration air duct to introduce refrigeration air flow to cool the magnetic field fresh-keeping space inside it, and control the refrigeration Methods include:

Determine whether the status of the magnetic field fresh-keeping space meets the preset rapid refrigeration start conditions;

If so, control the refrigeration system to rapidly cool the magnetic field fresh-keeping device until the state of the magnetic field fresh-keeping space meets the preset rapid cooling end conditions;

After the refrigeration system completes rapid cooling of the magnetic field preservation device, control the refrigeration system to perform one or more stages of transitional cooling process on the magnetic field preservation device;

After the refrigeration system completes the transition cooling of the magnetic field preservation device, the refrigeration system is controlled to perform normal cooling of the magnetic field preservation device.

Optionally, the process of the refrigeration system rapidly cooling the magnetic field freshness device is configured such that the refrigeration system continues to provide refrigeration airflow to the magnetic field freshness device in a high refrigeration load state.

Optionally, the magnetic field fresh-keeping device is provided with a surrounding air duct that starts from the air inlet, surrounds the fresh-keeping space and returns to the return air outlet; and a first temperature detection component installed in the surrounding air duct; and determines whether the state of the magnetic field fresh-keeping space satisfies The steps of presetting the rapid refrigeration start conditions include: determining whether the first temperature value detected by the first temperature detection component is greater than or equal to the first temperature threshold; if so, determining that the state of the magnetic field fresh-keeping space meets the rapid refrigeration start conditions.

Optionally, the first temperature detection component is installed in the upstream section surrounding the air flow in the air duct, and the magnetic field preservation device further includes: a second temperature detection component installed in the downstream section surrounding the air flow in the air duct; the rapid cooling end conditions include: The first temperature value is less than or equal to the second temperature threshold and/or the second temperature value detected by the second temperature detection component is less than or equal to the third temperature threshold. The second temperature threshold is smaller than the first temperature threshold, and the third temperature threshold is smaller than the second temperature threshold.

Optionally, the transitional refrigeration process includes multiple stages, and the step of controlling the refrigeration system to perform the multiple-stage transitional refrigeration process on the magnetic field preservation device includes:

In each stage, if the first temperature value is greater than or equal to the refrigeration start temperature threshold corresponding to that stage, the refrigeration system is controlled to start and provide refrigeration airflow to the magnetic field preservation device in a normal refrigeration load state; if the first temperature value is less than or equal to When the refrigeration shutdown temperature threshold corresponding to this stage is reached, the refrigeration system is controlled to stop providing refrigeration airflow to the magnetic field preservation device;

After the number of times the control refrigeration system stops providing refrigeration airflow to the magnetic field preservation device exceeds a preset threshold, or the second temperature value is less than or equal to the stage temperature threshold of this stage, the next stage of transitional refrigeration is entered.

Optionally, as refrigeration proceeds, the refrigeration stop temperature threshold and the refrigeration start temperature threshold of the subsequent transitional refrigeration stage are respectively smaller than the refrigeration stop temperature threshold and the refrigeration start temperature threshold of the previous transitional refrigeration stage; The stage temperature threshold is smaller than the temperature threshold of the previous transition cooling stage.

Optionally, during the last stage of transitional cooling of the magnetic field preservation device by the refrigeration system, if the number of times the refrigeration system stops providing cooling airflow to the magnetic field preservation device exceeds a preset threshold, or the second temperature value is less than or equal to After the stage temperature threshold of the last stage is reached, the step of controlling the refrigeration system to perform normal cooling of the magnetic field fresh-keeping device is executed.

Optionally, the refrigeration load of the refrigeration system and the size of the refrigeration airflow in the normal refrigeration load state are respectively smaller than the refrigeration load and the size of the refrigeration airflow in the high refrigeration load state.

According to another aspect of the present invention, a magnetic field fresh-keeping refrigerator is also provided. The magnetic field fresh-keeping refrigerator includes: a box body defining a storage compartment inside; a refrigeration air duct to provide refrigeration airflow to the storage space; and a refrigeration system. To form the refrigeration airflow; the magnetic field freshness device is arranged in the storage room, and has an air inlet and a return air outlet for connecting the refrigeration air duct to introduce refrigeration airflow to cool the magnetic field freshness space inside; refrigeration control The device includes a memory and a processor, wherein the memory stores a machine executable program. When the machine executable program is executed by the processor, the refrigeration control method of the magnetic field fresh-keeping refrigerator according to any of the above is implemented.

Optionally, the magnetic field fresh-keeping device is provided with an air inlet and a return air outlet for connecting the refrigeration air duct, and forms a surrounding air duct starting from the air inlet, surrounding the fresh-keeping space and returning to the return air outlet; and the magnetic field fresh-keeping refrigerator includes: a first temperature The detection component is arranged in the upstream section surrounding the air flow in the air duct, and the detected temperature value is recorded as the first temperature value; the second temperature detection component is arranged in the downstream section surrounding the air flow in the air duct, and the detected temperature value is recorded as Second temperature value.

Based on the foregoing description, those skilled in the art can understand that in the foregoing technical solution of the present invention, the magnetic field preservation device is arranged in the storage room of the magnetic field preservation refrigerator, and the magnetic field is used to improve the storage quality. When the state of the magnetic field fresh-keeping space meets the preset rapid cooling start conditions, the refrigeration system quickly cools the magnetic field fresh-keeping device. When the magnetic field fresh-keeping space needs to be cooled quickly, rapid cooling is performed to meet the requirement that the magnetic field fresh-keeping device is opened or a new one is put in. Requirements for rapid cooling after the stored items are placed. After the refrigeration system completes rapid cooling of the magnetic field preservation device, the refrigeration system is controlled to perform one or more stages of transitional refrigeration process on the magnetic field preservation device. After rapid refrigeration technology, the transitional refrigeration process is used to slow down the temperature drop and avoid rapid temperature fluctuations. The solution of the present invention avoids temperature fluctuations in the fresh-keeping space, and combines the effects of temperature and magnetic field to improve the fresh-keeping effect of food in the fresh-keeping space.

Furthermore, the magnetic field fresh-keeping refrigerator and its refrigeration control method of the present invention use multiple temperature detection components as a basis for control to accurately obtain the temperature in the magnetic field fresh-keeping device, thereby improving the accuracy of control.

Furthermore, the magnetic field fresh-keeping refrigerator and its refrigeration control method of the present invention specifically formulate corresponding control strategies and start-stop conditions for rapid refrigeration, transitional refrigeration, and normal refrigeration, effectively achieving the control objectives and ensuring freshness preservation. The temperature of the space is more uniform, making the storage quality more balanced.

From the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will further understand the above and other objects, advantages and features of the present invention.

Description of the drawings

In order to explain the technical solutions of the present invention more clearly, some embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that components or parts labeled with the same reference numerals in different drawings are the same or similar; the drawings of the present invention are not necessarily drawn to scale with each other. In the attached picture:

Figure 1 is a schematic diagram of a magnetic field fresh-keeping refrigerator according to an embodiment of the present invention;

Figure 2 is a schematic diagram of a magnetic field fresh-keeping device in a magnetic field fresh-keeping refrigerator according to an embodiment of the present invention;

Figure 3 is a schematic diagram of the magnetic field preservation device shown in Figure 2 from another angle;

Figure 4 is a side cross-sectional view of the magnetic field fresh-keeping device in the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 5 is a partial enlarged view of position A in Figure 4;

Figure 6 is a partial enlarged view of B in Figure 4;

Figure 7 is a schematic diagram of the top section of the surrounding air duct of the magnetic field fresh-keeping device in the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 8 is an exploded view of the components of the magnetic field fresh-keeping device in the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 9 is a schematic diagram of the air guide member of the magnetic field fresh-keeping device in the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 10 is a schematic diagram of the air duct of the magnetic field fresh-keeping device in the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 11 is a system block diagram of the control component of the magnetic field fresh-keeping device in the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 12 is a schematic diagram of the refrigeration control method of the magnetic field fresh-keeping refrigerator according to one embodiment of the present invention;

Figure 13 is a flow chart of an optional implementation of the refrigeration control method of the magnetic field fresh-keeping refrigerator according to an embodiment of the present invention.

Detailed ways

Those skilled in the art should understand that the embodiments described below are only some of the embodiments of the present invention, rather than all the embodiments of the present invention. These partial embodiments are intended to explain the technical principles of the present invention and are not intended to be used for To limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should still fall within the protection scope of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", " Terms indicating directions or positional relationships, such as "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation. Specific orientations of construction and operation are therefore not to be construed as limitations of the invention. Furthermore, the terms “first”, “second”, “third”, “primary” and “secondary” are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In addition, it should be noted that in the description of the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a fixed connection. It is a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Figure 1 is a schematic diagram of a magnetic field fresh-keeping refrigerator according to an embodiment of the present invention; the magnetic field fresh-keeping refrigerator 10 can be a refrigerator and includes: a box 110, a door 120, and a refrigeration system (not shown in the figure). The box 110 may define at least one storage compartment 130 with an open front side, usually multiple storage compartments, such as refrigerated storage compartments, frozen storage compartments, variable temperature storage compartments, and so on. The number and functions of specific storage compartments 130 can be configured according to predetermined requirements.

The magnetic field fresh-keeping refrigerator 10 can use air cooling to cool the storage compartment 130. That is, a cooling air duct that provides cooling air flow to the storage compartment 130 is provided in the box 110 . The refrigeration system is used to form a refrigeration air flow, which may include an air duct system and a compression refrigeration system. The air duct system uses the fan 160 to send the refrigeration air flow that has been exchanged by the heat exchanger 150 (evaporator) of the compression refrigeration system to the storage compartment 130 through the air supply port, and then returns to the air duct through the return air port 232 to achieve refrigeration. In some embodiments, a refrigeration air duct 140 for providing refrigeration air flow is provided at the back of the storage compartment 130. The heat exchanger 150 can be disposed in the refrigeration air duct 140 to exchange heat with the air flow passing through. A fan 160 is provided in the refrigeration air duct 140 to promote the formation of the above-mentioned circulating refrigeration system. airflow.

There may be multiple storage compartments, and at least one of the multiple storage compartments is placed with a magnetic field preservation device 20 . Those skilled in the art can configure a refrigeration system and air path for the storage compartment according to needs. For example, a heat exchanger 150 can be configured for one storage compartment, or a heat exchanger 150 can be configured for two or more storage compartments. Heater 150.

The heat exchanger 150 (evaporator) is a part of the compression refrigeration system. The compression refrigeration system utilizes the compression phase change cycle of the refrigerant in the compressor, condenser, evaporator, and throttling device to achieve heat transfer.

Since the box, door, and refrigeration system of this type of refrigerator are familiar to those skilled in the art and are easy to implement, those skilled in the art can select the refrigeration system as needed. In order not to cover up and obscure the inventive points of the present application, the following The box 110, the door 120, and the refrigeration system itself will not be described in detail.

The magnetic field fresh-keeping device 20 is arranged in a storage compartment 130 and is provided with a magnetic field component for applying a magnetic field to the fresh-keeping space 23 inside the device. The magnetic field component can use either permanent magnet components or electromagnetic components, that is, electromagnetic coils and permanent magnets are used to generate a magnetic field. In some embodiments, electromagnetic coils and permanent magnets can also be used in combination to generate magnetic fields. Considering the structure size and the adjustability of the magnetic field, it is preferable to use magnetic field components of electromagnetic components.

The magnetic field fresh-keeping device 20 is provided with an air inlet and a return air outlet for communicating with the cooling air duct 140 to introduce refrigeration airflow to cool the magnetic field fresh-keeping space inside it.

FIG. 2 is a schematic diagram of the magnetic field fresh-keeping device 20 in the magnetic field fresh-keeping refrigerator 10 according to an embodiment of the present invention; FIG. 3 is a schematic diagram of the magnetic field fresh-keeping device 20 shown in FIG. 2 from another angle. Figure 4 is a side cross-sectional view of the magnetic field freshness device 20 in the magnetic field freshness refrigerator 10 according to one embodiment of the present invention. Figure 5 is a partial enlarged view of position A in Figure 4; Figure 6 is a partial enlarged view of position B in Figure 4. The magnetic field fresh-keeping device 20 is provided with an air inlet 231 and a return air port 232 for communicating with the refrigeration air duct 140 to introduce refrigeration airflow to cool the fresh-keeping space 23 inside it. The magnetic field fresh-keeping device 20 is provided with an air inlet 231 and a return air outlet 232 for communicating with the refrigeration air duct 140, and forms a surrounding air duct starting from the air inlet 231, surrounding the fresh-keeping space 23, and returning to the return air outlet 232.

The magnetic field fresh-keeping device 20 can be configured as a drawer. For example, the magnetic field fresh-keeping device 20 can include a barrel 22 and a drawer 21 . An air inlet 231 and a return air outlet 232 are formed at the rear of the barrel 22 to communicate with the cooling air duct 140 . The drawer 21 is pullably arranged in the barrel 22 and defines a fresh-keeping space 23 therein. That is, the fresh-keeping space 23 in the drawer 21 can be controlled by a magnetic field and temperature to realize the magnetic field fresh-keeping function.

The surrounding air duct enters the interior of the magnetic field fresh-keeping device 20 from the air inlet 231 at the top rear end of the magnetic field fresh-keeping device 20 , passes through the top wall 221 of the barrel 22 , enters the top of the front baffle 215 of the drawer 21 , and flows through the front of the drawer 21 The baffle 215 then enters the space below the drawer bottom from the bottom, and then returns to the air return port 232 located on the rear wall 224 of the barrel 22 to complete the air flow circulation. The section that surrounds the air duct and passes through the top wall 221 of the barrel 22 , that is, the section located at the top of the magnetic field preservation device 20 is called the top section 241 . The section that surrounds the air duct and passes through the front baffle 215 of the drawer 21, that is, the section located at the front of the magnetic field fresh-keeping device 20, is called the front section 242. The section that surrounds the air duct and passes through the space below the drawer bottom, that is, the section located at the bottom of the magnetic field fresh-keeping device 20 is called the bottom section 243. The surrounding air duct forms an air path surrounding the fresh-keeping space 23 from the front and rear directions, effectively achieving uniform cooling.

That is, the surrounding air duct includes a top section 241 located on the top wall 221 of the barrel 22, a front section 242 located on the front baffle 215 of the drawer 21, and a bottom section 243 located below the drawer 21. The airflow flows from the air inlet 231 enters the top section 241, then flows through the front section 242, the bottom section 243 and then enters the return air outlet 232.

The top wall 221 of the barrel 22 may include: a drawer top cover 211, a shell plate 212, and a top heat insulation plate 213. The top wall 221 of the barrel 22 is composed of, from top to bottom, a shell plate 212, a top heat insulation plate 213, and a drawer top cover 211.

The return air outlet 232 may be disposed in the middle of the rear wall 224 of the barrel 22 . The top end of the rear wall 224 extends obliquely toward the rear end of the top wall 221 of the barrel 22 , and the air inlet 231 is provided on the inclined extension surface. The positions of the above-mentioned air inlet 231 and return air outlet 232 make the magnetic field fresh-keeping device 20 and the air duct of the magnetic field fresh-keeping refrigerator 10 cooperate more smoothly, thereby improving the air supply efficiency. In addition, the air inlet 231 is arranged at the top of the rear side of the drawer 21 and is arranged at an angle, which reduces the occupation of the fresh-keeping space 23 by the air supply structure and makes the structure more compact and effective.

The drawer top cover 211 is opposite to the top opening of the drawer 21 and is used to close the top space of the fresh-keeping space 23 . The shell plate 212 is disposed above the drawer top cover 211 and has a first distance between it and the drawer top cover 211 . The top heat insulation board 213 is arranged on the first Within the interval, the space between the top heat insulation board 213 and the drawer top cover 211 forms a top section 241 that surrounds the air duct and flows through the top wall 221 of the barrel 22 . The drawer top cover 211 is also provided with a plurality of through holes, so that the fresh-keeping space 23 and the top section 241 are connected through the through holes. The diameter of the through hole can be set to be smaller so that the refrigeration airflow can enter the fresh-keeping space 23 evenly and avoid directly blowing the stored items in the fresh-keeping space 23 .

In order to simplify the molding process, the barrel body 22 can be used as an upper and lower, or left and right split inner barrel, which is fixed by special buckles or screws, or can also be used as an integrated barrel. The inner side of the side wall of the barrel 22 is provided with a corresponding drawer 21 installation structure, slide rail or slideway.

The barrel 22 is provided with thermal insulation parts around the outer air duct, such as the top heat insulation board 213, the middle partition 2152, the bottom heat insulation board, and the rear wall heat insulation board. This prevents the cooling capacity of the refrigeration airflow from dissipating and improves the efficiency of refrigeration. efficiency.

Figure 7 is a schematic diagram of the top section 241 of the surrounding air duct of the magnetic field freshness device 20 in the magnetic field freshness refrigerator 10 according to one embodiment of the present invention. A plurality of air guide ribs 2131 are also formed on the side of the top heat insulation panel 213 facing the drawer top cover 211 to use the air guide ribs 2131 to guide the air flow in the top section 241 so that the air flow flows through the top section evenly. 241.

FIG. 8 is an exploded view of the drawer 21 of the magnetic field freshness device 20 in the magnetic field freshness refrigerator 10 according to an embodiment of the present invention. The front baffle 215 of the drawer 21 may include: a middle partition 2152, an air duct member 2153, a panel 2151, and an outer frame 2156. From front to back, they are panel 2151, middle partition 2152, and panel 2151. The outer frame 2156 serves as the peripheral frame of the front baffle 215 of the drawer 21, and may have a support frame and a decorative strip located outside the support frame. The front baffle 215 of the drawer 21 closes the front space of the fresh-keeping space 23 and can be pulled out by the user.

The air duct member 2153 is disposed on the side of the middle partition 2152 facing the fresh-keeping space 23, and together with the middle partition 2152 defines a front section 242 that surrounds the air duct and flows through the front baffle 215. The top of the air duct member 2153 is connected Front baffle air inlet 2154 of top section 241. The front ends of the plurality of air guide ribs 2131 of the top heat insulation panel 213 can guide the air flow to the front baffle air inlet 2154.

The panel 2151 is disposed on the side of the middle partition 2152 opposite to the fresh-keeping space 23; and forms an air heat insulation space between the panel 2151 and the middle partition 2152. Panel 2151 may be made from a glass plate. That is to say, the middle partition 2152 divides the front baffle 215 of the drawer 21 into two chambers, the front and rear. The front chamber is an air-insulated space to avoid cooling leakage. The rear chamber is the front section 242 surrounding the air duct. The middle partition 2152 can also be made of thermal insulation material to further prevent cold energy leakage. A plurality of protrusions may be formed on the side of the middle partition 2152 facing the panel 2151 to offset the rear side of the panel 2151 for supporting the panel 2151.

The above-mentioned double-layer structure of the front baffle 215 of the drawer 21 has a compact structure and good thermal insulation effect. The front baffle 215 of the drawer 21 can connect the double-layer structure into a whole through decorative strips or screw buckles. The two layers increase the thermal insulation effect, and the middle partition 2152, the air duct piece 2153, the panel 2151, and the outer frame 2156 The matching structure between them can be reasonably and simply fixed as a whole using fewer parts. For example, mutual fixation can be achieved through snap connections such as buckles, claws, and holes. The lower end of the middle partition 2152 is provided with a corresponding plug-in structure, which is connected with the lower part of the drawer 21 to form a fixed whole. The front baffle 215 of the drawer 21 can also be provided with a sealing strip on the rear side of the outer frame 2156, which cooperates with the sealing groove at the front end of the barrel 22 to achieve sealing of the fresh-keeping space 23.

In order to simplify the molding process, the barrel body 22 can be used as an upper and lower, or left and right split inner barrel, which is fixed by special buckles or screws, or can also be used as an integrated barrel. A corresponding drawer 21 installation structure, slide rail or slideway is provided inside the side wall 225 of the barrel 22 .

Both sides of the drawer 21 cooperate with the guide rail components of the barrel 22, and the drawer 21 can be pulled and arranged along the front and rear directions of the barrel 22 as a whole. After retracting the barrel 22, the drawer 21 forms a relatively sealed fresh-keeping space 23, and the fresh-keeping storage is realized through the magnetic field exerted by the magnetic field assembly.

The barrel 22 is provided with thermal insulation parts around the outer air duct, such as the top heat insulation board 213, the middle partition 2152, the bottom heat insulation board, and the rear wall heat insulation board. This prevents the cooling capacity of the refrigeration airflow from dissipating and improves the efficiency of refrigeration. efficiency.

FIG. 9 is a schematic diagram of the air guide 214 of the magnetic field freshness device 20 in the magnetic field freshness refrigerator 10 according to an embodiment of the present invention. The top wall 221 of the barrel 22 also includes an air guide 214 . The air guide 214 is disposed at the front end of the top wall 221 of the barrel 22. The rear portion of the air guide 214 has a first air guide 2141 connected with the front end of the top section 241. The bottom of the air guide 214 is in contact with the front baffle. The air outlet 2154 is opposite and has a second air guide opening 2142 for communicating with the front baffle air inlet 2154, thereby guiding the airflow of the top section 241 into the front section 242, and the bottom of the air guide member 214 is in contact with the air duct member 2153. The tops are respectively configured as inclined surfaces that slope downward from front to back. Utilizing the guidance of the above-mentioned air guide 214, wind resistance and noise can be reduced. Front baffle air inlet 2154 is available A grille is provided to cooperate with the air guide 214 and the air duct structure of the front section 242 .

The first air guide 2141 and the front baffle air inlet 2154 can be an inclined surface, and the angle can be set to 1-89°. The gap between the front baffle air inlet 2154 and the inner barrel is 0-10mm, and the gap position can be filled with a sealing strip. Make it in close contact without hardness interference. The opening area of the front baffle air inlet 2154 must be greater than or equal to the area of the front end of the top section 241. The material of the air duct part 2153 can be ordinary plastic or plastic material with good thermal conductivity (with thermal conductivity or thermal insulation coating). It is connected to the drawer 21 and the drawer front cover by a specific plug-in fitting method. A certain amount of thermal insulation is pasted in the air duct part 2153. Thermal insulation material (foam, PE or VIP, etc.), and the front baffle air outlet 2155 at the lower end of the air duct piece 2153 allows the air flow to completely enter the bottom section 243 surrounding the air duct, so that the air flow passes through the bottom section 243 evenly .

The drawer bottom is spaced apart from the bottom wall 223 of the barrel 22 to form a lower space as the bottom section 243 surrounding the air duct. A front baffle air outlet 2155 is provided at the front of the drawer bottom at a position opposite to the bottom end of the air duct member 2153, so that the front baffle air outlet 2155 can be used to communicate with the bottom section 243.

The magnetic field component of the magnetic field fresh-keeping refrigerator 10 can use an electromagnetic component as the magnetic field component, or a permanent magnet as the magnetic field component. For example, an electromagnetic coil is combined with a magnetic conductive plate to form an electromagnetic plate, or a magnetic plate is made of permanent magnets. In addition, the magnetic field component can also use a combination of electromagnetic coils and permanent magnets to generate a magnetic field.

In some embodiments, the magnetic assembly may include two oppositely arranged magnetic plates, for example, arranged on the top and bottom walls of the magnetic field preservation device 20 , and the magnetic field directions of the magnetic plates may be set to face the same direction, so that within the magnetic field preservation space 23 Form a uniform magnetic field with intensity that meets the preservation requirements.

In some embodiments, the magnetic field assembly may also include a conductive tape. The conductive tape is used to connect the oppositely arranged magnetic plates to form an annular magnetic conductive path surrounding the drawer 21 . The annular magnetic conductive path can be made of materials with low coercivity and high magnetic permeability. The magnetic conductive path formed by it can be used to gather the magnetic field, improve the uniformity of the magnetic field in the storage space, and at the same time reduce the release of the magnetic field to the outside. , to reduce interference to other components outside the magnetic field preservation device 20 (for example, to avoid magnetizing other components, etc.). The magnetic field helps to improve the quality of storage, shorten freezing time, reduce the juice loss rate and nutrient loss of food, reduce the number of microorganisms and bacteria, and extend the preservation period. And the magnetic field fresh-keeping device 20 is configured to form a surrounding air duct that sequentially flows from the air inlet 231 through the top wall 221 of the barrel 22, the front baffle 215 of the drawer 21, and the space below the drawer bottom and returns to the return air outlet 232, so as to maintain the fresh-keeping space. 23 for refrigeration. Furthermore, the geomagnetic field is coordinated with temperature control, and the surrounding air duct is used to cool the fresh-keeping space 23. The cold air can also take away the heat generated when the electromagnetic coil is working in time, avoiding temperature fluctuations in the fresh-keeping space 23. Combining the effects of temperature and magnetic field, Improve the preservation effect of food in the fresh-keeping space 23.

Figure 10 is a schematic diagram of the air duct of the magnetic field freshness device 20 in the magnetic field freshness refrigerator 10 according to an embodiment of the present invention. Figure 11 is a system block diagram of the control component of the magnetic field freshness device 20 in the magnetic field freshness refrigerator 10 according to one embodiment of the present invention.

Temperature sensing assembly 25 may include one or more temperature sensing components. The temperature detection component can be placed at different positions in the surrounding air duct and used to detect the temperature in the magnetic field preservation device 20 . In an optional embodiment, the temperature detection component 25 may include: a first temperature detection component 251 and a second temperature detection component 252 . The first temperature detection component 251 is disposed in the upstream section of the air flow in the surrounding air duct, and the detected temperature value is recorded as the first temperature value. The second temperature detection component 252 is disposed in the downstream section of the surrounding air flow in the air duct, and the detected temperature value is recorded as the second temperature value. The first temperature detection component 251 is disposed at the rear of the top section 241 in the surrounding air duct, close to the air inlet 231; the second temperature detection component 252 is disposed at the front of the top section 241 or the front of the bottom section 243 in the surrounding air duct. part, closer to the return air outlet 232.

Since the upstream section of the air flow, that is, the rear portion surrounding the top section 241 in the air duct, is close to the air inlet 231, its temperature is relatively low during the opening process of the evaporator 150; and the downstream section of the air flow is also That is, the front part of the top section 241 or the front part of the bottom section 243 convects with the air in the fresh-keeping space 23 through the through holes, and its temperature is relatively high. Through the first temperature detection component 251 and the second temperature detection component 252 located at different positions around the air duct, the overall temperature of the magnetic field preservation device 20 can be determined.

In other embodiments, the temperature detection component 25 can also use only one temperature detection component, such as retaining one of the first temperature detection component 251 and the second temperature detection component 252 , or setting it at other locations inside the magnetic field preservation device 20 A temperature detection component.

The refrigeration system 16 includes a damper 161 that can control the on-off and size of the refrigeration airflow sent to the magnetic field preservation device 20 by adjusting the damper 161 and the fan 160. The refrigeration load (that is, the refrigeration capacity) can be changed by starting and stopping the compressor 162 and adjusting the speed. The damper 161 can be disposed between the air inlet 231 and the cooling air duct 140, and configured for controlled opening and closing. The fan 160 can be used to promote the formation of a cooling air flow circulating in the surrounding air duct.

In some optional embodiments, the magnetic field preservation device 20 is arranged in the refrigerated storage room, the fan 160 can be a refrigeration fan that supplies air to the refrigerated storage room, and the damper 161 is used to open and close the air inlet 231 . The evaporator 150 may be a refrigeration evaporator dedicated to cooling the refrigerated storage compartment.

The refrigeration controller 17 includes a memory 172 and a processor 171, where the memory 172 stores a machine executable program 173. When the machine executable program 173 is executed by the processor 171, the refrigeration control method of the magnetic field fresh-keeping refrigerator of this embodiment is implemented.

The refrigeration controller 17 is connected to the refrigeration system 16 with signals and is used to provide control signals to the refrigeration system 16. The control signals are used to control the opening and closing of the damper 161, the start and stop of the fan 160, the start and stop of the compressor 162, and the rotation speed, thereby adjusting the refrigeration. load. The refrigeration controller 17 can be integrated on the main control board of the refrigerator 10 .

The refrigeration controller 17 can be implemented by various devices with certain data processing capabilities. In a typical configuration, the controller 300 can include a processor 310, a memory 320, an input/output interface, etc. The refrigeration controller 17 can accept the measurement results of the temperature detection component 25 as a control basis for the refrigeration system 16 .

This embodiment also provides a refrigeration control method for a magnetic field fresh-keeping refrigerator, which is used to control the magnetic field fresh-keeping refrigerator of the above embodiment, and can achieve rapid and stable cooling and cooling of the magnetic field fresh-keeping device 20 . Figure 12 is a schematic diagram of a refrigeration control method of a magnetic field fresh-keeping refrigerator according to an embodiment of the present invention. The refrigeration control method of the magnetic field fresh-keeping refrigerator generally includes:

Step S102, obtain the status of the magnetic field fresh-keeping space. The status of the magnetic field fresh-keeping space includes the internal temperature of the magnetic field fresh-keeping device, the operating status of the magnetic field, the operating status of the refrigeration system, etc.

Step S104, determine whether the state of the magnetic field fresh-keeping space meets the preset rapid refrigeration start conditions. The rapid refrigeration start condition can be set according to the state where the magnetic field fresh-keeping device is opened or new storage items need to be quickly refrigerated. For example, the determination may be made by determining whether the first temperature value detected by the first temperature detection component is greater than or equal to the first temperature threshold. If the first temperature value is greater than the first temperature threshold, it is determined that the state of the magnetic field fresh-keeping space meets the rapid refrigeration start condition.

Step S106, when the rapid cooling start conditions are met, the refrigeration system is controlled to rapidly cool the magnetic field preservation device until the state of the magnetic field preservation space meets the preset rapid cooling end conditions. During the rapid refrigeration process, the refrigeration system continues to provide refrigeration airflow to the magnetic field preservation device in a high refrigeration load state. For example, the speed of the fan and compressor can be set to a higher gear than the normal state, thereby increasing the refrigeration capacity.

Step S108: After the refrigeration system completes rapid cooling of the magnetic field preservation device, the refrigeration system is controlled to perform one or more stages of transitional refrigeration process on the magnetic field preservation device.

The rapid cooling end condition may include: the first temperature value is less than or equal to the second temperature threshold and/or the second temperature value detected by the second temperature detection component is less than or equal to the third temperature threshold, the second temperature threshold is less than the first temperature threshold, and The third temperature threshold is less than the second temperature threshold. That is, after the temperature of the magnetic field fresh-keeping device has quickly dropped to a preset range, it enters the transitional refrigeration process. The transitional cooling process can also be called precooling mode.

The transitional refrigeration process can include one or more stages. In the case of a multiple-stage transitional refrigeration process, the steps of controlling the refrigeration system to perform a multiple-stage transitional refrigeration process on the magnetic field preservation device include:

In each stage, if the first temperature value is greater than or equal to the refrigeration start temperature threshold corresponding to that stage, the refrigeration system is controlled to start and provide refrigeration airflow to the magnetic field preservation device in a normal refrigeration load state; if the first temperature value is less than or equal to When the refrigeration shutdown temperature threshold corresponding to this stage is reached, the refrigeration system is controlled to stop providing refrigeration airflow to the magnetic field preservation device; after the number of times the refrigeration system is controlled to stop providing refrigeration airflow to the magnetic field preservation device exceeds the preset threshold, or the second temperature After the value is less than or equal to the stage temperature threshold of this stage, it enters the next stage of transition cooling.

As refrigeration proceeds, the refrigeration stop temperature threshold and refrigeration start temperature threshold of the subsequent transitional refrigeration stage are respectively smaller than the refrigeration stop temperature threshold and refrigeration start temperature threshold of the previous transitional refrigeration stage; the stage temperature threshold of the subsequent transitional refrigeration stage is less than Temperature threshold of the previous transition cooling stage.

Through the transitional refrigeration process in multiple stages, the cooling speed can be gradually reduced to avoid excessive temperature fluctuations of the magnetic field fresh-keeping device.

Step S110: After the refrigeration system completes the transition cooling of the magnetic field preservation device, the refrigeration system is controlled to perform normal cooling of the magnetic field preservation device. During the last stage of transitional cooling of the magnetic field preservation device by the refrigeration system, if the number of times the refrigeration system stops providing cooling airflow to the magnetic field preservation device exceeds the preset threshold, or the second temperature value is less than or equal to the last stage After the stage temperature threshold is reached, the steps of controlling the refrigeration system to perform normal refrigeration on the magnetic field fresh-keeping device are executed.

The refrigeration load of the refrigeration system and the size of the refrigeration airflow in the normal refrigeration load state are respectively smaller than the refrigeration load and the size of the refrigeration airflow in the high refrigeration load state. That is, the speed of the fan and compressor can be set to the normal gear. During the transition refrigeration process and the normal refrigeration process, the refrigeration system performs refrigeration in the normal refrigeration load state. Compared with the high refrigeration load state in the rapid refrigeration process, the speed of the fan and compressor is lower.

The method of this embodiment provides rapid cooling and cooling when the magnetic field fresh-keeping space needs to be quickly cooled, thereby meeting the rapid cooling requirements after the magnetic field fresh-keeping device is opened or new storage items are put in. After the refrigeration system completes rapid cooling of the magnetic field preservation device, the refrigeration system is controlled to perform one or more stages of transitional refrigeration process on the magnetic field preservation device. After rapid refrigeration technology, the transitional refrigeration process is used to slow down the temperature drop and avoid rapid temperature fluctuations. Combining the effects of temperature and magnetic field, it improves the preservation effect of food in the preservation space.

Figure 13 is a flow chart of an optional implementation of the refrigeration control method of the magnetic field fresh-keeping refrigerator according to an embodiment of the present invention. This implementation has two stages of transitional refrigeration. On this basis, those skilled in the art can implement one or more than two Stage transitional refrigeration. As shown in Figure 13, the control process includes:

Step S202, obtain the first temperature value Tsnr1 detected by the first temperature detection component and the second temperature value Tsnr2 detected by the second temperature detection component;

Step S204, determine whether the state of the magnetic field fresh-keeping space satisfies the preset rapid cooling start condition, that is, determine whether Tsnr1≥T1 is established. T1 is the first temperature threshold, which can be set according to the set temperature of the magnetic field fresh-keeping device, for example, in When the set temperature is near freezing point, T1 can be set to about 5 degrees Celsius.

Step S206, the refrigeration system performs rapid cooling on the magnetic field preservation device, and the fan and compressor run at high speed. That is to say, in the rapid cooling mode, the speed of the fan and compressor can be set to a higher gear than in the normal state, thereby improving the cooling capacity.

Step S208, determine whether Tsnr1≤T2 or Tsnr1≤T3 is established. T2 is the second temperature threshold, T3 is the third temperature threshold, the second temperature threshold T2 is smaller than the first temperature threshold T1, the third temperature threshold T3 is smaller than the second temperature threshold T2, for example, T2 can be set to 1 degree Celsius, and T3 can be set to -1 degrees Celsius.

Step S210, the refrigeration system enters the first stage of transitional refrigeration. When Tsnr1 is greater than or equal to Ton1, refrigeration starts, and the fan and compressor run at normal speed; when Tsnr1 is less than or equal to Toff1, refrigeration is turned off. Ton1 is the cooling start-up temperature threshold corresponding to the first stage of transitional cooling, and Toff1 is the cooling shutdown temperature threshold corresponding to the first stage of transitional cooling. For example, Ton1 can be set to -1 degrees Celsius, and Toff1 can be set to -1.5 degrees Celsius.

Step S212, determine whether the number of times Tsnr1 is less than or equal to Toff1 exceeds the number threshold, or whether Tsnr2≤Ts1 is established, and Ts1 is the stage temperature threshold of the first stage. That is, this step determines whether the number of times the refrigeration system stops providing refrigeration airflow to the magnetic field preservation device exceeds a preset threshold (for example, 5 times), or whether the second temperature value is less than or equal to the first stage temperature threshold. Ts1 can be set to -1 degrees Celsius.

Step S214, the refrigeration system enters the second stage of transitional refrigeration. When Tsnr1 is greater than or equal to Ton2, refrigeration starts, and the fan and compressor run at normal speed; when Tsnr1 is less than or equal to Toff2, refrigeration is turned off. Ton2 is the cooling start-up temperature threshold corresponding to the second stage of transitional cooling, and Toff2 is the cooling shutdown temperature threshold corresponding to the second stage of transitional cooling. For example, Ton2 can be set to -1.5 degrees Celsius, and Toff2 can be set to -2 degrees Celsius.

Step S216, determine whether the number of times Tsnr1 is less than or equal to Toff2 exceeds the number threshold, or whether Tsnr2 ≤ Ts2 is established, and Ts2 is the stage temperature threshold of the second stage. That is, this step determines whether the number of times the refrigeration system stops providing refrigeration airflow to the magnetic field preservation device exceeds a preset threshold (for example, 5 times), or whether the second temperature value is less than or equal to the second stage temperature threshold. Ts2 can be set to -2 degrees Celsius.

Step S218, the refrigeration system enters the normal refrigeration stage. When Tsnr1 is greater than or equal to the normal refrigeration start-up temperature, refrigeration starts, and the fan and compressor run at normal speed; when Tsnr1 is less than or equal to the normal refrigeration shutdown temperature, refrigeration is turned off. The normal cooling start-up temperature can be set to -2.0 degrees Celsius, and the normal cooling shutdown temperature can be set to -2.5 degrees Celsius.

In the above embodiment, the first temperature detection component can be disposed at the top of the magnetic field preservation device, Tsnr1 identifies the air temperature at the top of the magnetic field preservation device, and the second temperature detection component can be disposed at the bottom of the magnetic field preservation device, Tsnr1 identifies the bottom of the magnetic field preservation device air temperature. When the magnetic field preservation device is used in a non-freezing scenario to ensure that the food is not frozen, T1 can be set to about 5 degrees Celsius. Ton1 can be set to -1 degrees Celsius, and Toff1 can be set to -1.5 degrees Celsius. Ton2 can be set to -1.5 degrees Celsius, and Toff2 can be set to -2 degrees Celsius. The normal cooling start-up temperature can be set to -2.0 degrees Celsius, and the normal cooling shutdown temperature can be set to -2.5 degrees Celsius. Ts1 can be set to -1 degrees Celsius. Ts2 can be set to -2 degrees Celsius.

The above thresholds are only examples. When using the method of this embodiment, the above threshold parameters can be set as needed. The above method can not only achieve rapid cooling under high temperature conditions, but also prevent temperature fluctuations and rapid changes, which will lead to a decrease in storage quality.

So far, the technical solutions of the present invention have been described in conjunction with the foregoing embodiments. However, those skilled in the art can easily understand that the protection scope of the present invention is not limited to these specific embodiments. Without departing from the technical principles of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and can also make equivalent changes or replacements to the relevant technical features. Any changes, equivalent substitutions, improvements, etc. made within the concept and/or technical principles will fall within the protection scope of the present invention.

Claims (10)

1. A refrigeration control method for a magnetic field fresh-keeping refrigerator. The magnetic field fresh-keeping refrigerator includes: a box defining a storage compartment inside; a refrigeration air duct that provides refrigeration airflow to the storage compartment; Refrigeration system; a magnetic field preservation device arranged in the storage room. The magnetic field preservation device is provided with an air inlet and a return air outlet for connecting the refrigeration air duct to introduce the refrigeration airflow to the magnetic field preservation space inside. Refrigeration, and the refrigeration control method includes:

   Determine whether the state of the magnetic field fresh-keeping space meets the preset rapid refrigeration start conditions;

   If so, control the refrigeration system to perform rapid cooling on the magnetic field preservation device until the state of the magnetic field preservation space meets the preset rapid cooling end conditions;

   After the refrigeration system completes rapid cooling of the magnetic field preservation device, control the refrigeration system to perform one or more stages of transitional refrigeration process on the magnetic field preservation device;

   After the refrigeration system completes the transition cooling of the magnetic field preservation device, the refrigeration system is controlled to perform normal cooling of the magnetic field preservation device.
2. The refrigeration control method of the magnetic field fresh-keeping refrigerator according to claim 1, wherein

   The process of rapid cooling of the magnetic field fresh-keeping device by the refrigeration system is configured such that the refrigeration system continues to provide the refrigeration airflow to the magnetic field fresh-keeping device in a high refrigeration load state.
3. The refrigeration control method of a magnetic field fresh-keeping refrigerator according to claim 2, wherein the magnetic field fresh-keeping device is provided with a surrounding air duct starting from the air inlet, surrounding the fresh-keeping space and returning to the return air outlet; and installation The first temperature detection component in the surrounding air duct; and the step of determining whether the state of the magnetic field fresh-keeping space meets the preset rapid cooling start conditions includes:

   Determine whether the first temperature value detected by the first temperature detection component is greater than or equal to the first temperature threshold, and if so, determine whether the state of the magnetic field fresh-keeping space satisfies the rapid cooling start condition.
4. The refrigeration control method of the magnetic field fresh-keeping refrigerator according to claim 3, wherein the first temperature detection component is installed in an upstream section of the air flow in the surrounding air duct, and the magnetic field fresh-keeping device further includes: installed in the surrounding air duct. a second temperature detection component in the downstream section of the air flow in the air duct;

   The rapid cooling end condition includes: the first temperature value is less than or equal to the second temperature threshold and/or the second temperature value detected by the second temperature detection component is less than or equal to the third temperature threshold. The second temperature threshold is less than the first temperature threshold, and the third temperature threshold is less than the second temperature threshold.
5. The refrigeration control method of the magnetic field fresh-keeping refrigerator according to claim 4, wherein,

   The transitional refrigeration process includes multiple stages, and the step of controlling the refrigeration system to perform the multiple stages of transitional refrigeration process on the magnetic field preservation device includes:

   In each stage, if the first temperature value is greater than or equal to the refrigeration start temperature threshold corresponding to that stage, the refrigeration system is controlled to start and the refrigeration airflow is provided to the magnetic field preservation device in a normal refrigeration load state; If the first temperature value is less than the refrigeration shutdown temperature threshold corresponding to this stage, control the refrigeration system to stop providing the refrigeration airflow to the magnetic field preservation device;

   After the number of times the refrigeration system is controlled to stop providing the refrigeration airflow to the magnetic field preservation device exceeds a preset threshold, or the second temperature value is less than or equal to the stage temperature threshold of this stage, the next stage is entered. Transitional refrigeration.
6. The refrigeration control method of the magnetic field fresh-keeping refrigerator according to claim 5, wherein,

   As refrigeration proceeds, the refrigeration stop temperature threshold and refrigeration start temperature threshold of the subsequent transitional refrigeration stage are respectively smaller than the refrigeration stop temperature threshold and refrigeration start temperature threshold of the previous transitional refrigeration stage; the stage temperature threshold of the subsequent transitional refrigeration stage is less than Temperature threshold of the previous transition cooling stage.
7. The refrigeration control method of the magnetic field fresh-keeping refrigerator according to claim 5, wherein,

   During the last stage of transitional refrigeration of the magnetic field preservation device by the refrigeration system, if the refrigeration After the system stops providing the refrigeration airflow to the magnetic field preservation device more than a preset threshold, or after the second temperature value is less than or equal to the stage temperature threshold of the last stage, the system executes the control of the refrigeration The system performs normal cooling steps on the magnetic field preservation device.
8. The refrigeration control method of the magnetic field fresh-keeping refrigerator according to claim 5, wherein,

   The refrigeration load of the refrigeration system and the size of the refrigeration airflow in the normal refrigeration load state are respectively smaller than the refrigeration load of the refrigeration system and the size of the refrigeration airflow in the high refrigeration load state.
9. A magnetic field fresh-keeping refrigerator includes:

   A box whose interior defines a storage compartment;

   A refrigeration air duct provides refrigeration airflow to the storage space;

   A refrigeration system for forming the refrigeration airflow;

   A magnetic field fresh-keeping device is arranged in the storage room, and is provided with an air inlet and a return air outlet for connecting the refrigeration air duct, so as to introduce the refrigeration airflow to cool the magnetic field fresh-keeping space inside it;

   Refrigeration controller, including a memory and a processor, wherein the memory stores a machine executable program, and when the machine executable program is executed by the processor, the magnetic field fresh-keeping refrigerator according to any one of claims 1 to 8 is implemented. Refrigeration control methods.
10. The magnetic field fresh-keeping refrigerator according to claim 9, wherein

    The magnetic field fresh-keeping device is provided with an air inlet and a return air outlet for connecting the refrigeration air duct, and forms a surrounding air duct starting from the air inlet, surrounding the fresh-keeping space and returning to the return air outlet; and the Magnetic field fresh-keeping refrigerator includes:

    The first temperature detection component is arranged in the upstream section of the air flow in the surrounding air duct, and the detected temperature value is recorded as the first temperature value;

    The second temperature detection component is arranged in the downstream section of the air flow in the surrounding air duct, and the detected temperature value is recorded as the second temperature value.