Drainage device and cold storage equipment
By installing a magnetic suction part and a cover on the drain pipe, the defrosting water can be automatically discharged and closed, which solves the problems of increased evaporator frosting and waste of cooling capacity in cold storage equipment and reduces energy consumption.
Patent Information
- Application Number
- CN202520042738.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-08
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-08
AI Technical Summary
The problem of increased evaporator frosting and wasted cooling capacity in cold storage equipment.
A magnetic suction part and a cover are installed on the drain pipe. The cover is normally closed through the magnetic suction part. The drain pipe is automatically opened under the gravity of the defrost water. After the defrost water is discharged, it is automatically closed again, reducing the waste of cold energy and the phenomenon of frost formation.
Effectively drains defrost water, reduces cold energy waste and evaporator frost formation, and lowers the energy consumption of cold storage equipment.
Smart Images
Figure CN223678070U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of electrical equipment, especially to a drainage device and cold storage equipment. BACKGROUND
[0002] This part provides only background information related to the present disclosure, which is not necessarily prior art.
[0003] In the related art, the cold storage equipment utilizes a fan to drive air flow, and air in the cold storage equipment is transported to each chamber after being cooled by an evaporative chamber through an air duct. With the operation of the refrigeration system, water vapor in the equipment condenses into frost at the evaporator, and a drainage hole at the bottom of the evaporator is connected to a drainage pipe. After defrosting the evaporator, the defrosting water formed is naturally discharged through the drainage pipe.
[0004] When the internal air pressure of the refrigerator is low, external humid air may be sucked in through the drainage pipe, and when the internal air pressure of the refrigerator is high, cold air will be discharged through the drainage pipe, resulting in increased frosting of the evaporator and waste of cold energy. SUMMARY
[0005] The utility model discloses a kind of drainage devices, and the purpose of the utility model is to at least solve the problems of increased frosting of evaporator and waste of cold energy of cold storage equipment. The purpose is realized by the following technical solutions:
[0006] The first aspect of the utility model proposes a drainage device, which is used for discharging defrosting water of cold storage equipment, comprising:
[0007] A drainage pipe is provided with a magnetic attraction part;
[0008] A cover body is connected to the drainage pipe, and the cover body is provided with a magnetic attraction matching part. The magnetic attraction matching part and the magnetic attraction part are attracted to each other, so that the cover body closes the drainage pipe. The magnetic attraction matching part and the magnetic attraction part are arranged so that when the weight of the defrosting water supported by the cover body is greater than the preset weight, the cover body opens the drainage pipe.
[0009] The drainage device of the utility model sets the magnetic attraction part on the drainage pipe, and the cover body has the magnetic attraction matching part arranged opposite to the magnetic attraction part. The magnetic attraction part and the magnetic attraction matching part are attracted to each other to close the drainage pipe with the cover body. The cover body realizes the function of normally closed. When discharging defrosting water, the cover body is separated from the magnetic attraction state between the magnetic attraction part and the magnetic attraction matching part under the action of the gravity of defrosting water, so that the cover body is opened, and the drainage pipe is connected to discharge defrosting water. When the gravity of defrosting water is not enough to overcome the magnetic attraction force, the cover body is automatically restored to the position of closing the drainage pipe under the action of the magnetic attraction force, which ensures the smooth discharge of defrosting water, reduces the waste of cold energy and frosting phenomenon, and reduces the energy consumption of the cold storage equipment.
[0010] In addition, the drainage device according to the utility model also has the following additional technical features.
[0011] In some embodiments of the utility model, the magnetic attraction part is a first magnetic attraction gasket, the first magnetic attraction gasket extends along the circumference of the drain pipe and is connected to one end of the drain pipe facing the cover.
[0012] In some embodiments of the utility model, the magnetic attraction matching part is a second magnetic attraction gasket, the second magnetic attraction gasket is connected to one side of the cover facing the drain pipe.
[0013] In some embodiments of the utility model, the drainage device further comprises a rotating shaft, the drain pipe is provided with a mounting part, the rotating shaft is rotatably arranged on the mounting part, and the cover is rotatably arranged on the drain pipe through the rotating shaft.
[0014] In some embodiments of the utility model, the mounting part is arranged on the side wall of the drain pipe, the mounting part is provided with a mounting hole, and the rotating shaft is arranged in the mounting hole.
[0015] In some embodiments of the utility model, the drainage device further comprises a limiting structure, the limiting structure is arranged on the drain pipe and / or the cover, and the limiting structure is used for limiting the maximum overturning angle of the cover relative to the drain pipe.
[0016] In some embodiments of the utility model, the limiting structure is at least one limiting protrusion arranged on the cover.
[0017] In some embodiments of the utility model, the drain pipe has a drain end face, and the maximum overturning angle of the cover relative to the drain end face is 10°-70°.
[0018] Another aspect of the utility model provides a cold storage equipment, which comprises a box body, an evaporator, a water pan and the drainage device as any one of the above.
[0019] In some embodiments of the utility model, the cold storage equipment is further provided with a fan and a controller, the box body is connected with a door body, the box body is constructed with a first chamber and a second chamber, a first air duct is arranged in the first chamber, a first air door is arranged in the first air duct, a second air duct is arranged in the second chamber, a second air door is arranged in the second air duct, the fan is in communication with the first air duct and the second air duct respectively, and the controller is electrically connected with the fan, the first air door and the second air door.
[0020] When the door is opened, the controller controls the first air door to be closed, the second air door to be opened, and the fan to increase the rotating speed to drive air flow through the second air duct into the second chamber. BRIEF DESCRIPTION OF DRAWINGS
[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is made with reference to the accompanying drawings.
[0022] Figure 1 A structure schematic view of a drainage device according to an embodiment of the present application is schematically shown;
[0023] Figure 2 A structure schematic view of a drainage device according to an embodiment of the present application is schematically shown;
[0024] Figure 3 A structure schematic view of a drainage device according to an embodiment of the present application is schematically shown;
[0025] Figure 4 A structure schematic view of a drainage device according to an embodiment of the present application is schematically shown;
[0026] Figure 5 A structure schematic view of a cold storage device according to an embodiment of the present application is schematically shown;
[0027] Figure 6 A structure schematic view of a cold storage device according to an embodiment of the present application is schematically shown;
[0028] The reference signs are as follows:
[0029] 1, drain pipe; 10, magnetic attraction part; 100, first magnetic attraction gasket; 11, mounting part; 12, drainage end face;
[0030] 2, cover body; 20, magnetic attraction matching part; 200, second magnetic attraction gasket;
[0031] 3, rotating shaft;
[0032] 4, evaporator;
[0033] 5, box body; 50, first chamber; 500, first air duct; 501, first air door; 51, second chamber; 510, second air duct; 511, second air door; 52, third chamber; 520, third air duct; 521, third air door;
[0034] 6. water pan;
[0035] 7. fan;
[0036] 8. heating element;
[0037] 9. return air duct. DETAILED DESCRIPTION
[0038] Example embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.
[0039] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.
[0040] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0041] For ease of description, spatially relative terms can be used herein for describing an element's or feature's relationship to another element or feature as illustrated in the figures. Such relative terms include "internal," "external," "inwardly," "outwardly," "sternward," "forward," "above," "below," "lower," "upper," and the like. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0042] As Figures 1 to 4 shown, according to the embodiment of the utility model, propose a kind of drainage device, drainage device is used to discharge defrosting water of cold storage equipment, cold storage equipment can be refrigerator, cold storage, refrigerator car or refrigerated container and so on equipment with low-temperature storage goods function, the present embodiment is described with refrigerator as example.Drainage device includes drain pipe 1 and cover 2, one end of drain pipe 1 is communicated with the evaporator 4 chamber of refrigerator, evaporator 4 chamber is provided with evaporator 4, the bottom of evaporator 4 is provided with water pan 6, water pan 6 bottom is provided with drain, the water inlet of drain pipe 1 is communicated with drain, so that the water after evaporator 4 defrosting can flow into water pan 6, and flow out refrigerator after drain, drain pipe 1 is provided with magnetic attraction part 10, cover 2 is connected to the end of drain pipe 1, cover 2 is provided with magnetic attraction cooperation part 20, magnetic attraction cooperation part 20 and magnetic attraction part 10 are attracted to each other, so that cover 2 closes drain pipe 1, and magnetic attraction cooperation part 20 and magnetic attraction part 10 are set as, when the weight of defrosting water that cover 2 bears is greater than preset weight, cover 2 opens drain pipe 1.Cover 2 is closed drain pipe 1 under the action of magnetic force, so, defrosting water that flows into drain pipe 1 first gathers at cover 2, with more and more defrosting water, under the action of gravity of defrosting water, magnetic attraction part 10 and magnetic attraction cooperation part 20 are separated from magnetic attraction state, so that cover 2 opens, and defrosting water gathered at cover 2 flows away from drain pipe 1.Then, when the gravity of defrosting water is not enough to overcome the magnetic attraction force between cover 2 and drain pipe 1, then cover 2 restores to the position of closing drain pipe 1 automatically.
[0043] The drainage device sets up the magnetic attraction part 10 on the drain pipe 1, the cover body 2 has the magnetic attraction cooperation part 20 opposite the magnetic attraction part 10, and the magnetic attraction part 10 and the magnetic attraction cooperation part 20 attract each other to make the cover body 2 close the drain pipe 1, so that the cover body 2 realizes the function of normally closed, when discharging defrosting water, the cover body 2 overcomes the magnetic attraction between the cover body 2 and the drain pipe 1 under the gravity of defrosting water, so as to turn on the drain pipe 1 to discharge defrosting water, when the gravity of defrosting water is not enough to overcome the magnetic attraction, the cover body 2 is automatically restored to the position of closing the drain pipe 1 under the action of the magnetic attraction, which ensures the smooth discharge of defrosting water, reduces the waste of cold and the frosting phenomenon, and reduces the energy consumption of the cold storage equipment.
[0044] In some embodiments of the utility model, the magnetic attraction part 10 is a first magnetic attraction gasket 100, the first magnetic attraction gasket 100 extends along the circumference of the drain pipe 1 and is connected to one side of the drain pipe 1 facing the cover body 2, the magnetic attraction cooperation part 20 is a second magnetic attraction gasket 200, the second magnetic attraction gasket 200 is connected to one side of the cover body 2 facing the drain pipe 1, the first magnetic attraction gasket 100 and the second magnetic attraction gasket 200 are connected in a magnetic attraction type fitting mode, so that the cover body 2 closes the drain pipe 1, reduces the waste of cold and the frosting phenomenon, reduces the energy consumption of the cold storage equipment, and at the same time, when discharging defrosting water, the magnetic attraction part 10 and the magnetic attraction cooperation part 20 are separated from the magnetic attraction state under the gravity of water, so that the cover body 2 is opened to discharge defrosting water.
[0045] In other embodiments, the magnetic attraction part 10 can also use one of a magnet or a ferromagnetic part, and the magnetic attraction cooperation part 20 uses the other of a magnet or a ferromagnetic part, for example, the magnetic attraction part 10 is a magnet, and the magnetic attraction cooperation part 20 is a ferromagnetic part, or the magnetic attraction part 10 is a ferromagnetic part, and the magnetic attraction cooperation part 20 is a magnet, wherein the ferromagnetic part is made of ferromagnetic material, and the ferromagnetic material can be attracted by the magnet, for example, the ferromagnetic part can be made of iron, cobalt, nickel or the like. Alternatively, the magnetic attraction part 10 and the magnetic attraction cooperation part 20 can both be magnets and have different magnetic properties.
[0046] In some embodiments of the utility model, the drainage device further comprises a rotating shaft 3, the drain pipe 1 is provided with a mounting portion 11, the rotating shaft 3 is rotatably arranged on the mounting portion 11, and the cover body 2 is rotatably arranged on the drain pipe 1 through the rotating shaft 3. The mounting portion 11 is arranged on the side wall of the drain pipe 1, the mounting portion 11 is provided with a mounting hole, the rotating shaft 3 is arranged in the mounting hole, so as to mount the cover body 2 on the mounting portion 11, and the cover body 2 can rotate relative to the drain pipe 1 around the rotating shaft 3, so that the cover body 2 can be opened or closed relative to the drain pipe 1.
[0047] In other embodiments, the mounting portion 11 can also be arranged in the middle of the drain pipe 1 in the radial direction of the drain pipe 1, the rotating shaft 3 is arranged along the length direction of the mounting portion 11, the outer diameter of the cover body 2 is slightly smaller than the inner diameter of the drain pipe 1, so that the cover body 2 can be turned in the drain pipe 1 around the rotating shaft 3 to open or close the drain pipe 1, and a magnetic attraction structure is arranged on the outer edge of the cover body 2 and the inner wall of the drain pipe 1 respectively, or an elastic member can also be arranged, one end of the elastic member is connected with the cover body 2, and the other end of the elastic member is connected to a fixed position, the cover body 2 is closed to the drain pipe 1 under the action of the elastic member, and the cover body 2 is lowered to open the drain pipe 1 under the action of the gravity of water to overcome the action force of the elastic member, and the outer diameter of the cover body 2 is greater than or equal to the outer diameter of the drain pipe 1.
[0048] In some embodiments of the present application, the drainage device further comprises a limiting structure arranged on the drain pipe 1 and / or the cover body 2, and the limiting structure is used to limit the maximum turning angle of the cover body 2 relative to the drain pipe 1. Specifically, the limiting structure can be arranged on the drain pipe 1 or arranged on the cover body 2 or arranged on the drain pipe 1 or the cover body 2, and the limiting mechanism limits the maximum turning angle of the cover body 2 relative to the drain pipe 1, so that the angle of the cover body 2 when opening the drain pipe 1 is not too large, which causes the cover body 2 to be unable to automatically recover to the position of closing the drain pipe 1, and ensures that the cover body 2 can be rotated to close the drain pipe 1 under the action of the magnetic attraction force, thereby reducing the serious waste of cold energy caused by the communication of the drain pipe 1 with the outside world, the problem of the entry of outside wet air into the evaporator 4 to aggravate frosting and the like.
[0049] In some embodiments of the present application, the limiting structure is at least one limiting protrusion arranged on the cover body 2. In this embodiment, the limiting structure comprises a plurality of limiting protrusions arranged on the cover body 2, and the plurality of limiting protrusions are arranged at intervals along the extension direction of the rotating shaft 3, when the turning angle of the cover body 2 relative to the drain pipe 1 reaches the maximum turning angle, the limiting protrusion abuts against the side wall of the drain pipe 1, at this time, the cover body 2 cannot continue to turn, thereby limiting the maximum turning angle of the cover body 2 relative to the drain pipe 1.
[0050] In some embodiments of the present application, the drain pipe 1 has a drain end surface 12, and the maximum turning angle of the cover body 2 relative to the drain end surface 12 is 10°-70°. Specifically, the maximum turning angle of the cover body 2 relative to the drain end surface 12 is 10°-70°, for example, the angle of the cover body 2 relative to the drain end surface 12 can be 10° or 20° or 30° or 40° or 50° or 70° and the like, which ensures that the defrosting water is smoothly discharged, and at the same time, ensures that the cover body 2 can automatically recover to the position of closing the drain pipe 1 under the action of the magnetic attraction force.
[0051] The second aspect of the present application provides a cold storage equipment, such as Figure 5 and 6As shown, the cold storage device of the embodiment is a refrigerator, which comprises a cabinet 5, an evaporator 4, a water pan 6, a heating element and the above-mentioned drain device, the evaporator 4 is arranged in the cabinet 5, the water pan 6 is arranged at the bottom of the evaporator 4, the heating element 8 is arranged at the bottom of the evaporator 4, the heating element 8 can be a heating wire, a heating pipe or the like, and the water inlet of the drain pipe 1 communicates with the water pan 6. The drain pipe 1 is provided with a magnetic attraction part 10, the cover body 2 is provided with a magnetic attraction matching part 20 opposite to the magnetic attraction part 10, the magnetic attraction part 10 and the magnetic attraction matching part 20 are attracted to each other, so that the cover body 2 closes the drain pipe 1, and the cover body 2 realizes the function of being normally closed. When the defrosting water is discharged, the cover body 2 overcomes the magnetic attraction force between the cover body 2 and the drain pipe 1 under the gravity of the defrosting water, so as to conduct the drain pipe 1 to discharge the defrosting water. When the gravity of the defrosting water is not enough to overcome the magnetic attraction force, the cover body 2 automatically restores to the position of closing the drain pipe 1 under the action of the magnetic attraction force, so as to ensure that the defrosting water is smoothly discharged, reduce the waste of cold energy and the frosting phenomenon, and reduce the energy consumption of the cold storage device.
[0052] In some embodiments of the utility model, the cold storage device is further provided with a fan 7 and a controller, the cabinet 5 is connected with a door body, the door body is installed on the cabinet 5 in a pivoting mode, an electronic stopper is arranged on the cabinet 5 and contacts with the door body, the stopper can be telescopic, when the door body is closed, the electronic stopper is compressed, when the door body is opened, the electronic stopper is extended, the stopper is connected with the controller, and the position of the door body is detected in real time through the electronic stopper. The cabinet 5 is constructed with a first chamber 50 and a second chamber 51, wherein the first chamber 50 is a refrigeration chamber, is used for placing food and providing a low-temperature refrigeration environment for the food, a first air duct 500 is arranged in the first chamber 50, and a first air door 501 is arranged in the first air duct 500. The second chamber 51 is a freezing chamber, is used for placing food and providing a low-temperature freezing environment for the food, a second air duct 510 is arranged in the second chamber 51, a second air door 511 is arranged in the second air duct 510, the fan 7 respectively communicates with the first air duct 500 and the second air duct 510, and the controller is electrically connected with the fan 7, the first air door 501 and the second air door 511.
[0053] When the door body is opened, the controller controls the first air door 501 to be closed, the second air door 511 to be opened, and controls the fan 7 to increase the rotating speed to drive the airflow to enter the second chamber 51 through the second air duct 510. Specifically, the refrigerator is in the deep cooling mode, when the door body is opened, the electronic limit switch detects that the door body is opened, at this time, the controller controls the first air door 501 to be closed, the second air door 511 to be opened, and controls the fan 7 to increase the rotating speed. By closing the first air door 501 and opening the second air door 511 when the door body is opened, and controlling the fan 7 to increase the rotating speed, the problem of difficulty in opening the door by the user caused by the large negative pressure in the box body 5 when the cover body 2 is closed and the drain pipe 1 is closed can be prevented, the airflow pressure in the second chamber 51 is increased, the internal and external pressure difference and the opening door pulling force are reduced, and the normal opening of the door body is ensured.
[0054] In the embodiment, the box body 5 is further configured with a third chamber 52, the third chamber 52 is a variable temperature chamber, and the cold storage device further comprises a return air pipeline 9, one end of the return air pipeline 9 is in communication with the first chamber 50, the second chamber 51 and the third chamber 52 respectively, and the other end is in communication with the evaporator. The third chamber 52 is provided with a third air duct 520, the third air duct 520 is provided with a third air door 521, the fan 7 is in communication with the third air duct 520, and the controller is electrically connected with the third air door 521. When the door body is opened, the third air door 521 is closed.
[0055] In the embodiment, the cold storage device is further provided with a touch screen, when the user needs to open the door, the user presses the door opening button on the touch screen, at this time, the controller obtains the door opening request, the controller judges whether the fan 7 is in the maximum gear, if yes, judges whether the first air door 501 and the third air door 521 remain in the closed state, if not, controls the fan 7 to be in the maximum gear, if the first air door 501 and the third air door 521 remain in the closed state, the limit switch is used to obtain whether the door body is opened, if the first air door 501 and the third air door 521 do not remain in the closed state, the first air door 501 and the third air door 521 are closed, if it is obtained that the door body is in the opened state, the fan 7 is closed, and if it is obtained that the door body is not in the opened state, the fan 7 remains in the opened state. The cold storage device quickly pressurizes the chamber to be opened by adjusting the rotating speed of the fan 7 and the state of the air door, reduces the internal and external pressure difference, and helps the user to open the door.
[0056] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. A drain device for draining defrost water from a cold storage device, characterized by, The drainage device comprises: a drain pipe provided with a magnetic attraction part; a cover connected to the drain pipe, the cover being provided with a magnetic attraction matching part, the magnetic attraction matching part and the magnetic attraction part attracting each other to enable the cover to close the drain pipe, and the magnetic attraction matching part and the magnetic attraction part being configured to enable the cover to open the drain pipe when the weight of the defrosted water borne by the cover is greater than a preset weight.
2. The water drainage device according to claim 1, characterized in that The magnetic attraction part is a first magnetic attraction gasket extending along the circumference of the drain pipe and connected to one end of the drain pipe facing the cover.
3. The water drainage device of claim 2, wherein, The magnetic attraction matching part is a second magnetic attraction gasket connected to one side of the cover facing the drain pipe.
4. The water drainage device according to any one of claims 1 to 3, characterized in that, The drainage device further comprises a rotating shaft, the drain pipe is provided with a mounting part, and the rotating shaft is rotatably arranged on the mounting part, and the cover is rotatably arranged on the drain pipe through the rotating shaft.
5. The water drainage device of claim 4, wherein, The mounting part is arranged on the side wall of the drain pipe, and the mounting part is provided with a mounting hole, and the rotating shaft is arranged in the mounting hole.
6. The water drainage device of claim 4, wherein, The drainage device further comprises a limiting structure arranged on the drain pipe and / or the cover, the limiting structure being used to limit the maximum turning angle of the cover relative to the drain pipe.
7. The water drainage device of claim 6, wherein, The limiting structure is at least one limiting protrusion arranged on the cover.
8. The water drainage device of claim 6, wherein, The drain pipe has a drain end face, and the maximum turning angle of the cover relative to the drain end face is 10°-70°.
9. A cold storage device characterized by comprising: The drainage device comprises: a box, an evaporator, a water pan, and the drainage device according to any one of claims 1 to 8, the evaporator being arranged in the box, the water pan being arranged at the bottom of the evaporator, and the water inlet of the drain pipe being in communication with the water pan.
10. The cold storage device according to claim 9, characterized by The cold storage device is further provided with a fan and a controller, the box is connected with a door body, the box is constructed with a first chamber and a second chamber, the first chamber is provided with a first air duct, the first air duct is provided with a first air door, the second chamber is provided with a second air duct, the second air duct is provided with a second air door, the fan is in communication with the first air duct and the second air duct respectively, and the controller is electrically connected with the fan, the first air door, and the second air door; when the door body is opened, the controller controls the first air door to be closed, the second air door to be opened, and the fan to increase the rotating speed to drive the airflow to enter the second chamber through the second air duct.