CN109549506B

CN109549506B - Microwave oven

Info

Publication number: CN109549506B
Application number: CN201811464151.7A
Authority: CN
Inventors: 韩大成
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-12-11
Anticipated expiration: 2038-11-30
Also published as: CN109549506A

Abstract

The invention discloses a microwave oven, which comprises a shell, an upper air duct assembly and a lower air duct assembly, wherein the upper air duct assembly is arranged on the shell; the upper part of the shell is provided with a first electric control chamber, and the lower part of the shell is provided with a second electric control chamber; the upper air duct assembly is arranged corresponding to the first electric control chamber, an upper air duct for dissipating heat of an electric control device in the first electric control chamber is formed on the upper air duct assembly, and the upper air duct is provided with an upper air inlet and an upper air outlet; the lower air duct assembly corresponds to the second electric control chamber, the lower air duct assembly is formed with a lower air duct which is used for radiating the electric control device in the second electric control chamber, and the lower air duct is provided with a lower air inlet and a lower air outlet. The microwave oven disclosed by the invention can be used for dissipating heat of the electric control devices at different positions, so that the heat dissipation effect is improved, and the experience of a user using the microwave oven is further improved.

Description

Microwave oven

Technical Field

The invention relates to the technical field of microwave ovens, in particular to a microwave oven.

Background

The conventional microwave oven is only provided with one air duct, and cold air is blown through a plurality of electric control devices (such as a frequency conversion assembly, a display control assembly, a magnetic control assembly and the like) of the microwave oven in sequence in the air duct so as to dissipate heat of each electric control device. However, when the cold air blows through the electric control device located at the front section of the air duct, the temperature of the cold air rises to form hot air, and the hot air is reused to continuously blow backwards to the electric control device located at the rear section of the air duct, so that the heat dissipation effect is greatly reduced, and the experience of a user using the microwave oven is easily influenced.

Disclosure of Invention

The invention mainly aims to provide a microwave oven, which can dissipate heat of electric control devices at different positions, improve the heat dissipation effect of the electric control devices and further improve the experience of users using the microwave oven.

In order to achieve the above object, the present invention provides a microwave oven, which includes a housing, an upper air duct assembly and a lower air duct assembly; the upper part of the shell is provided with a first electric control chamber, and the lower part of the shell is provided with a second electric control chamber; the upper air duct assembly is arranged corresponding to the first electric control chamber, an upper air duct for dissipating heat of an electric control device in the first electric control chamber is formed on the upper air duct assembly, and the upper air duct is provided with an upper air inlet and an upper air outlet; the lower air duct assembly corresponds to the second electric control chamber, the lower air duct assembly is formed with a lower air duct which is used for radiating the electric control device in the second electric control chamber, and the lower air duct is provided with a lower air inlet and a lower air outlet.

Optionally, the upper air duct includes a first air duct and a second air duct, the upper air inlet includes a first air inlet communicated with the first air duct and a second air inlet communicated with the second air duct, and the upper air outlet includes a first air outlet communicated with the first air duct and a second air outlet communicated with the second air duct.

Optionally, the first air duct is disposed at the front of the first electronic control room, and the second air duct is disposed at the rear of the first electronic control room; or, the first air duct and the second air duct are respectively arranged at two opposite side parts of the first electric control chamber.

Optionally, the first air duct is disposed at a front portion of the first electronic control room and extends in a width direction of the first electronic control room.

Optionally, an electric control device is installed in the first air duct, and the electric control device includes a circuit board and a display driving board.

Optionally, the upper air duct assembly includes a first fan, and the first fan is installed at the first air inlet or the first air outlet; or the upper air duct assembly comprises two first fans, and the two first fans are respectively installed at the first air inlet and the first air outlet.

Optionally, the number of the second air ducts is two, and the two second air ducts are respectively disposed at two opposite sides of the rear portion of the first electronic control chamber, or the two second air ducts are respectively disposed at the front end and the rear end of the side portion of the first electronic control chamber.

Optionally, any one or two of the two second air ducts are provided with a magnetic control assembly.

Optionally, the two second air ducts are respectively disposed at two sides of the rear portion of the first electric control chamber, and the second air outlets of the second air ducts are opened toward the side plate of the housing.

Optionally, the upper air duct assembly further includes two second fans, and the two second fans are respectively installed at air inlet ends of the two second air ducts.

Optionally, the upper air duct assembly includes two air guiding covers disposed at two opposite sides of the rear portion of the housing, and two second air ducts are formed in the two air guiding covers respectively.

Optionally, the air inlet end of the second air duct is communicated with the first air duct.

Optionally, the number of the second air ducts is two, an air duct is formed between the two second air ducts, and the air inlet end of the second air duct is communicated with the first air duct through the air duct.

Optionally, the lower air duct includes a third air duct and a fourth air duct, the lower air inlet includes a third air inlet communicated with the third air duct and a fourth air inlet communicated with the fourth air duct, and the lower air outlet includes a third air outlet communicated with the third air duct and a fourth air outlet communicated with the fourth air duct.

Optionally, the third air duct is disposed at the front of the second electronic control room, and the fourth air duct is disposed at the rear of the second electronic control room; or the third air duct and the fourth air duct are respectively arranged at two opposite side parts of the second electric control chamber.

Optionally, the third air outlet is opened towards the bottom plate or the side plate of the housing; and/or the fourth air outlet is opened towards the bottom plate or the side plate of the shell.

Optionally, a frequency conversion assembly is installed in the third air duct and/or the fourth air duct.

Optionally, the lower air duct assembly includes a third fan, and the third fan is installed at the third air inlet; and/or, the lower air duct component comprises a fourth fan, and the fourth fan is arranged at the fourth air inlet.

Optionally, the lower air duct assembly further includes a third air guide cover, the third air guide cover is installed in the second electric control chamber, and the third air guide cover forms the third air duct; and/or the lower air duct assembly comprises a fourth air guide cover, the fourth air guide cover is arranged in the second electric control chamber, and the fourth air guide cover forms the fourth air duct.

Optionally, the microwave oven further includes a door assembly installed at the front portion of the housing, the door assembly includes a door panel and a decorative panel, the door panel is rotatably installed on the housing, and the decorative panel is located below the door panel.

Optionally, the decorative panel is provided with a blind hole; or the decorative plate is provided with an air inlet hole in a penetrating manner, and the air inlet hole is communicated with the second electric control chamber.

According to the technical scheme, the upper air duct is arranged in the first electric control chamber of the microwave oven, the lower air duct is arranged in the second electric control chamber of the microwave oven, fresh air can be introduced into the upper air duct through the upper air inlet to dissipate heat of the electric control device, and fresh air can be introduced into the lower air duct through the lower air inlet to dissipate heat of the electric control device, so that the electric control devices at different positions in the microwave oven can be supplemented with fresh air to be cooled, and the heat dissipation effect is effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic diagram of a microwave oven according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the microwave oven of FIG. 2;

FIG. 3 is a schematic view of the microwave oven of FIG. 2 from another perspective;

FIG. 4 is a view taken along the line S in FIG. 3₁A cross-sectional view in a plane (i.e., a virtual plane parallel to the top surface of the microwave oven);

FIG. 5 is a schematic air flow diagram of the upper duct of the microwave oven of FIG. 4;

FIG. 6 is a schematic structural view of a second fan of FIG. 4;

FIG. 7 is a schematic view of the second electric control chamber in FIG. 4 provided with an air duct;

FIG. 8 is a view taken along S in FIG. 3₂A cross-sectional view in a plane (i.e., another virtual plane parallel to the top surface of the microwave oven);

FIG. 9 is a schematic view of the axial flow fan of FIG. 8;

FIG. 10 is a left side view of the microwave oven of FIG. 1;

FIG. 11 is a right side view of the microwave oven of FIG. 1;

fig. 12 is a bottom view of the microwave oven of fig. 1.

The reference numbers illustrate:

the objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention discloses a microwave oven 10, wherein the microwave oven 10 can dissipate heat of electric control devices at different positions, so that the heat dissipation effect is improved, and the experience of a user using the microwave oven 10 is further improved. It should be noted that in the description of the present invention and fig. 1 to 9, solid arrows indicate structures such as openings, chambers, holes, or faces, and dotted arrows indicate air flow directions.

Referring to fig. 1 to 4, in an embodiment of the microwave oven 10 of the present invention, the microwave oven 10 includes a housing 100, an upper air duct assembly 400, and a lower air duct assembly 500 (see fig. 8 for the lower air duct assembly 500); wherein, the upper part of the shell 100 is provided with a first electric control chamber 111, and the lower part of the shell 100 is provided with a second electric control chamber 112; the upper air duct assembly 400 is arranged corresponding to the first electric control chamber 111, the upper air duct assembly 400 is formed with an upper air duct for dissipating heat of the electric control device 300 in the first electric control chamber 111, and the upper air duct is provided with an upper air inlet and an upper air outlet; lower floor's wind channel subassembly 500 corresponds the setting of second automatically controlled room 112, and lower floor's wind channel subassembly 500 is formed with the radiating lower floor wind channel of electrically controlled device 300 for in the second automatically controlled room 112, lower floor's wind channel has lower floor's air intake and lower floor's air outlet.

Specifically, the housing 100 of the microwave oven 10 includes a housing body 110 and a door assembly 120, and the first electric control chamber 111, the second electric control chamber 112 and the heating chamber 113 are formed inside the housing body 110. The door body assembly 120 is mounted at the front of the casing 100, the door body assembly 120 includes a door panel 121, a decorative panel 122 and a handle 123, the door panel 121 is rotatably mounted on the casing 100, and the decorative panel 122 is located below the door panel 121. The heating chamber 113 can be opened or closed by rotating the door panel 121. The decorative plate 122 is provided with a blind hole; or, the decorative plate 122 is provided with an air inlet hole through, and the air inlet hole is communicated with the second electric control chamber 112 to supplement fresh air for the second electric control chamber 112 or the lower air duct.

The electronic control device 300 of the microwave oven 10 includes a display control assembly 310, a magnetron assembly 320, a frequency conversion assembly 330, and other electronic devices 340. Part of components of the electric control device 300 are installed in the first electric control chamber 111 and are located in the upper air duct; the other part of the components of the electronic control device 300 is installed in the second electronic control chamber 112 and located in the lower air duct. By adopting the design, the longitudinal space of the microwave oven 10 can be fully utilized, and the space occupied by the microwave oven in the front-back direction or the left-right direction is reduced. For example, when the display control assembly 310 and the magnetron assembly 320 are installed in the first electronic control room 111, the display control assembly 310 and the magnetron assembly 320 are cooled by the upper air duct of the upper air duct assembly 400, and the frequency conversion assembly 330 is installed in the second electronic control room 112, and the frequency conversion assembly 330 is cooled by the lower air duct of the lower air duct assembly 500. In this embodiment, the display and control assembly 310 is located in the first electronic control chamber 111, i.e. closer to the upper portion of the microwave oven 10, so that it is easier for the user to view without lowering his head or bending his/her body. Of course, in other embodiments, the display and control assembly 310 may be disposed in the second electronic control room 112, and the frequency conversion assembly 330 may be disposed in the first electronic control room 111.

Referring to fig. 1, 4 and 5, for the upper air duct assembly 400, in a manner that the upper air duct assembly 400 forms the upper air duct, an air guiding cover (described in detail later) may be disposed in the first electric control chamber 111, and the upper air duct may be formed by enclosing the air guiding cover, or may be directly formed by a cavity of the first electric control chamber 111. Because the upper air duct has an upper air inlet and an upper air outlet, the casing 100 is provided with an air inlet group corresponding to the upper air inlet and an air outlet group corresponding to the upper air outlet. During heat dissipation, air enters the upper air duct from the upper air inlet, and the air dissipates heat of the electric control device 300 of the first electric control chamber 111 in the upper air duct, so that hot air formed after heat dissipation is blown out from the upper air outlet. It should be noted that, in this embodiment and the following embodiments, the holes of the "air inlet hole group" and the "air outlet hole group" may be circular holes, square holes, strip-shaped holes, or irregular holes.

Referring to fig. 1, 3 and 8, for the lower air duct assembly 500, in a manner that the lower air duct assembly 500 forms the lower air duct, an air guiding cover (described in detail later) may be disposed in the second electric control chamber 112, and the lower air duct may be formed by enclosing the air guiding cover, or may be directly formed by a cavity of the second electric control chamber 112. Because the lower air duct has a lower air inlet and a lower air outlet, the casing 100 is provided with an air inlet group corresponding to the lower air inlet and an air outlet group corresponding to the lower air outlet. During heat dissipation, air enters the lower air duct from the lower air inlet, and this air dissipates heat of the electric control device 300 in the second electric control chamber 112 in the lower air duct, so that hot air formed after heat dissipation is blown out from the lower air outlet.

It is worth mentioning that lower floor's wind channel can communicate with upper air channel, also can not communicate, when upper air channel and lower floor's wind channel do not communicate (upper air channel and lower floor's wind channel mutually independent promptly), the air of rising temperature after the upper air channel cooling can not enter into lower floor's wind channel, the air of rising temperature after the lower floor's wind channel cooling also can not enter into upper air channel, and cooling air mutually noninterferes, and the wind effect that looses is better. Therefore, in this embodiment, the upper air duct and the lower air duct are not communicated, so that the casing does not need to be additionally provided with an air duct communicating the upper air duct and the lower air duct, the internal space of the casing is saved, and the space utilization rate of the microwave oven 10 is improved.

According to the technical scheme, the upper air duct is arranged in the first electric control chamber 111 of the microwave oven 10, and the lower air duct is arranged in the second electric control chamber 112 of the microwave oven 10, wherein the upper air duct can introduce fresh air through the upper air inlet to dissipate heat of the electric control device 300, and the lower air duct can introduce fresh air through the lower air inlet to dissipate heat of the electric control device 300, so that the electric control devices 300 at different positions in the microwave oven 10 can be supplemented with fresh air to be cooled, and the heat dissipation effect is effectively improved.

Referring to fig. 1, 4 and 5, for the upper air duct assembly 400, the upper air duct formed by the upper air duct assembly 400 may be an integral air duct or may be composed of a plurality of small air ducts. In order to effectively dissipate heat of each electric control device 300, in this embodiment, the upper air duct includes a first air duct 401 and a second air duct 402, the upper air inlet includes a first air inlet 401a communicated with the first air duct 401 and a second air inlet 402a communicated with the second air duct 402, and the upper air outlet includes a first air outlet 401b communicated with the first air duct 401 and a second air outlet 402b communicated with the second air duct 402.

Based on this, a part of the electronic control device 300 of the first electronic control room 111 can be installed in the first air duct 401, and another part of the electronic control device 300 of the first electronic control room 111 can be installed in the second air duct 402. During heat dissipation, air enters the first air duct 401 from the first air inlet 401a, and this air dissipates heat of the electric control device 300 in the first air duct 401, and hot air formed after heat dissipation is blown out from the first air outlet 401 b. Similarly, air enters the second air duct 402 from the second air inlet 402a, and this air dissipates heat of the electric control device 300 in the second air duct 402, and hot air generated after heat dissipation is blown out from the second air outlet 402 b.

The arrangement of the first air duct 401 and the second air duct 402 in the first electronic control room 111 is not particularly limited. One of the first air duct 401 and the second air duct 402 is arranged in such a manner that the first air duct 401 is disposed in front of the first electronic control chamber 111, and the second air duct 402 is disposed in rear of the first electronic control chamber 111, that is, the first air duct 401 and the second air duct 402 are arranged in the front-rear direction. The first air duct 401 may extend in the left-right direction, or the front-rear direction, or in an inclined manner of the microwave oven 10. It should be noted that, in view of the first air duct 401 being located at the front portion of the first electronic control chamber 111, in order to prevent the cooled and heated air from blowing forward to the user, the first air outlet 401b of the first air duct 401 may be opened toward the side plate of the housing 100.

In addition, the first air duct 401 and the second air duct 402 are also designed to be arranged in the following manner: the first air duct 401 and the second air duct 402 are respectively disposed at two side portions of the first electronic control chamber 111, that is, the first air duct 401 and the second air duct 402 are arranged in a left-right direction. Similarly, to prevent the cooled and heated air from being blown forward to the user, the first air outlet 401b of the first air duct 401 or the second air outlet 402b of the second air duct 402 may be opened toward the side plate of the housing 100, so as to prevent the cooled and heated air from being blown forward to the user.

The position where the upper duct assembly 400 forms the first duct 401 and the structure thereof will be described below.

Referring to fig. 1, 4 and 5, in the present embodiment, the first air duct 401 is disposed at the front portion of the first electric control chamber 111, the first air duct 401 extends along the left-right direction of the microwave oven 10, the first air duct 401 has a first air inlet 401a and a first air outlet 401b, the first air inlet 401a is opened toward a side plate of the housing 100, and the side plate is provided with a first air inlet group 101a corresponding to the first air inlet 401a (see fig. 10 and 11); the first outlet 401b opens toward another opposite side plate of the housing 100, and the other opposite side plate is provided with a first outlet group 101b corresponding to the first outlet 401b (see fig. 10 and 11). Design like this, the air is shortest through first wind channel 401's route to it has the new trend air to pass through first wind channel 401 to last, effectively accelerates the heat dissipation.

The first air duct 401 is directly formed by enclosing the surrounding walls of the front portion of the first electronic control room 111, and the first air inlet 401a and the first air outlet 401b are respectively located on two opposite side walls of the first electronic control room 111. The first air duct 401 may dissipate heat by natural wind flow. However, in order to enhance the heat dissipation effect of the first air duct 401, the upper air duct assembly 400 includes two first fans 410, and the two first fans 410 are respectively installed at the first air inlet 401a and the first air outlet 401b, so that the air circulation speed can be increased, and the heat dissipation effect can be enhanced. Of course, in the embodiment, the upper air duct assembly 400 may also include only one first fan 410, and the first fan 410 is installed at the first air inlet 401a or the first air outlet 401b, and may also drive the air to pass through the first air duct 401, so that the first fan 410 may be saved, and the cost may be saved.

In view of the front and short path of the first air duct 401, a display and control assembly 310 may be installed in the first air duct 401, and the display and control assembly 310 includes a computer board 311 and a display and control board 312. The length direction of the computer board 311 is consistent with the extending direction of the first air duct 401, and the board surface of the display driving board 312 is vertically arranged so as to be convenient for displaying. Therefore, the display control assembly 310 has a larger contact area with air and a better heat dissipation effect.

The position of the upper duct assembly 400 to form the second duct 402 and its structure will be described below.

Referring to fig. 1, 4 and 5, in the present embodiment, the second air duct 402 is disposed at the rear portion of the first electric control chamber 111. The number of the second air paths 402 may be one or two. For example, the number of the second air paths 402 is two, and two second air paths 402 are respectively disposed at two opposite sides of the rear portion of the first electronic control chamber 111, or two second air paths 402 are respectively disposed at the front and rear ends of the side portion of the first electronic control chamber 111. Specifically, the number of the second air ducts 402 is two, the two second air ducts 402 are respectively disposed at two opposite sides of the rear portion of the first electronic control chamber 111, and the two second air ducts 402 extend in the front-rear direction.

Specifically, each second air duct 402 has a second air inlet 402a and a second air outlet 402b, and both second air ducts 402 can be used for mounting a part of the electronic control device 300. For the second air duct 402 located on the left side, the second air inlet 402a of the second air duct 402 is opened toward the back plate of the housing 100, the back plate is provided with a second air inlet group 102a (as shown in fig. 10 and 11) corresponding to the second air inlet 402a, the second air outlet 402b of the second air duct 402 is opened toward the left side plate of the housing 100, and the left side plate is provided with a second air outlet group 102b (as shown in fig. 10 and 11) corresponding to the second air outlet 402 b. For the second air duct 402 located at the right side, the second air inlet 402a of the second air duct 402 located at the right side is opened toward the back plate of the housing 100, the back plate is provided with another second air inlet group 102a corresponding to the second air inlet 402a, the second air outlet 402b of the second air duct 402 located at the right side is opened toward the right side plate of the housing 100, and the right side plate is provided with another second air outlet group 102b corresponding to the second air outlet 402 b.

In view of the fact that the magnetron assembly 320 emits electromagnetic waves during operation, the magnetron assembly 320 generates a large amount of heat to effectively dissipate heat to the magnetron assembly 320, in this embodiment, the magnetron assembly 320 is installed in any one or two of the two second air ducts 402, and the magnetron assembly 320 includes a magnetron which emits electromagnetic waves during operation to the heating chamber 113 to heat food. The second air duct 402 can be used for independently radiating heat of the magnetron, so that the heat radiating effect of the magnetron is effectively improved, and the service life of the magnetron is prolonged.

Because the magnetron assembly 320 generates a large amount of heat, the temperature of the air after cooling the magnetron assembly 320 is increased, and in order to prevent the heated air from leaking to other positions and causing the temperature increase of other electrical components 340, in this embodiment, the upper air duct assembly 400 includes two second air guiding covers 430 arranged at two opposite sides of the rear portion of the casing 100, and two second air ducts 402 are respectively formed in the two second air guiding covers 430. Therefore, in the microwave oven 10 of the present invention, the display control assembly 310, the magnetic control assembly 320, and the frequency conversion assembly 330 are respectively disposed in different air ducts, so that not only is the heat dissipation efficiency improved, but also the internal space of the microwave oven 10 is fully utilized, and the space optimization configuration is realized.

Specifically, the second wind scooper 430 includes an induced air guide joint 431, a heat dissipation air guide joint 432, and an air outlet air guide joint 433 which are sequentially communicated; the magnetic control assembly 320 is installed in the heat dissipation air guide section 432, the air guide section 431 introduces air into the heat dissipation air guide section 432, the air dissipates heat of the magnetic control assembly 320 in the heat dissipation air guide section 432, and finally the air is led out through the air outlet air guide section 433.

In this embodiment, the upper air duct assembly 400 further includes two second fans 420, and the two second fans 420 are respectively installed at the air inlet ends of the two second air ducts 402. Specifically, the second fan 420 is installed in the induced air guide joint 431, the second fan 420 may be an axial fan 600, or a cross-flow wind wheel, or a centrifugal wind wheel, where the second fan 420 is a centrifugal wind wheel (the centrifugal wind wheel is shown in fig. 6), and the two centrifugal wind wheels are driven to rotate by a motor 421.

Referring to fig. 4 and 7, based on any of the above embodiments, to increase the air intake of the second air duct 402, the air intake end of the second air duct 402 can be communicated with the first air duct 401. Specifically, since the first air duct 401 is directly formed in the first electronic control chamber 111, and a part of air in the first air duct 401 can be discharged to the rear portion of the first electronic control chamber 111, it is preferable that an air duct 503 is formed between the two second air ducts 402, and the air duct 503 communicates the air inlet end of the second air duct 402 with the first air duct 401. Therefore, a part of the air entering the first air duct 401 from the first air inlet 401a is used for dissipating heat of the display and control assembly 310, and is blown out from the first air outlet 401b after heat dissipation, and the other part of the air is leaked to the rear part of the first electronic control chamber 111 and enters the second air duct 402 through the air duct 503 to supplement the air volume of the second air duct 402. Of course, other electronic control components (such as the electrical component 340) may also be installed in the second electronic control room 112, and when the air passes through the air duct 503, the air can also dissipate heat of the electrical component 340.

Referring to fig. 3 and 8, for the lower air duct assembly 500, the lower air duct formed by the lower air duct assembly 500 may be an integral air duct or may be composed of a plurality of small air ducts. In order to effectively dissipate heat of each electric control device 300 in the second electric control chamber 112, in this embodiment, the lower air duct includes a third air duct 501 and a fourth air duct 502, the lower air inlet includes a third air inlet 501a communicated with the third air duct 501 and a fourth air inlet 502a communicated with the fourth air duct 502, and the lower air outlet includes a third air outlet 501b communicated with the third air duct 501 and a fourth air outlet 502b communicated with the fourth air duct 502.

Based on this, part of the components of the electronic control device 300 of the second electronic control room 112 may be installed in the third air duct 501, and another part of the components of the electronic control device 300 of the second electronic control room 112 may be installed in the fourth air duct 502. During heat dissipation, air enters the third air duct 501 from the third air inlet 501a, and this air dissipates heat of the electric control device 300 in the third air duct 501, and hot air formed after heat dissipation is blown out from the third air outlet 501 b. Similarly, air enters the fourth air duct 502 from the fourth air inlet 502a, and this air dissipates heat of the electric control device 300 in the fourth air duct 502, and hot air generated after heat dissipation is blown out from the fourth air outlet 502 b. For example, the third air duct 501 and/or the fourth air duct 502 may have the variable frequency assembly 330 mounted therein. Specifically, the microwave oven 10 has two frequency conversion assemblies 330, and the two frequency conversion assemblies 330 are respectively installed in the third air duct 501 and the fourth air duct 502, so that the third air duct 501 and the fourth air duct 502 are respectively utilized to dissipate heat of the two frequency conversion assemblies 330, which are not mutually affected, and the heat dissipation effect is greatly enhanced.

The arrangement of the third air duct 501 and the fourth air duct 502 in the second electronic control room 112 is not particularly limited. One of the third air duct 501 and the fourth air duct 502 is arranged in such a manner that the third air duct 501 is disposed in the front portion of the second electronic control chamber 112, and the fourth air duct 502 is disposed in the rear portion of the second electronic control chamber 112, that is, the third air duct 501 and the fourth air duct 502 are arranged in the front-rear direction. The third air duct 501 may extend in the left-right direction, or the front-back direction, or in an inclined direction of the microwave oven 10. The fourth air duct 502 may extend in the left-right direction, the front-back direction, or the inclined direction of the microwave oven 10.

Referring to fig. 3 and 8, in the present embodiment, the third air duct 501 and the fourth air duct 502 are disposed at the rear portion of the second electric control chamber 112 side by side, and the third air duct 501 and the fourth air duct 502 extend in the front-rear direction. In order to prevent the air heated after cooling the frequency conversion assembly 330 from blowing forward to the user, the third air outlet 501b of the third air duct 501 may be opened toward the bottom plate or the side plate of the housing 100, and the fourth air outlet 502b is opened toward the bottom plate or the side plate of the housing 100. Specifically, the back plate of the casing 100 is provided with a third air inlet group 103a corresponding to the third air inlet 501a and a fourth air inlet group 104a corresponding to the fourth air inlet 502a (as shown in fig. 11 and 12), and the third air outlet 501b and the fourth air outlet 502b are disposed on the bottom plate of the casing 100.

Based on this, the bottom of the casing 100 is provided with a plurality of supporting legs 130, and the supporting legs 130 separate the bottom surface of the casing 100 and the placing table of the microwave oven 10 by a certain distance, so that the air blown out from the third air duct 501 and the fourth air duct 502 is outwardly dispersed.

The third air duct 501 and the fourth air duct 502 can dissipate heat by natural wind flow. However, in this embodiment, to enhance the heat dissipation effect, the lower air duct assembly 500 includes a third fan 510, the third fan 510 is installed at the third air inlet 501a, and the third fan 510 supplies air to the third air duct 501. The lower air duct assembly 500 includes a fourth fan 520, the fourth fan 520 is installed at the fourth air inlet 502a, and the fourth fan 520 supplies air to the fourth air duct 502. Obviously, the third fan 510 and the fourth fan 520 drive the air flow to flow, so that fresh air can be supplemented at an accelerated speed, the air flow is accelerated, and the heat dissipation efficiency is greatly improved. The third fan 510 and the fourth fan 520 may be axial flow fans 600, cross flow wind wheels, or centrifugal wind wheels, and the axial flow fans 600 are specifically selected herein for cost saving.

Further, in order to concentrate the air quantity to dissipate heat for the frequency conversion component 330, the lower air duct component 500 further includes a third air guiding cover 530, the third air guiding cover 530 is installed in the second electric control chamber 112, the third air guiding cover 530 forms a third air duct 501, the third air guiding cover 530 is arranged in an air duct shape, and one of the frequency conversion components 330 is installed in the third air guiding cover 530; and/or the lower air duct assembly 500 includes a fourth air guiding cover 540, the fourth air guiding cover 540 is installed in the second electric control chamber 112, the fourth air guiding cover 540 forms the fourth air duct 502, the fourth air guiding cover 540 is disposed in an air duct shape, and the other frequency conversion assembly 330 is installed in the fourth air guiding cover 540.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A microwave oven, characterized in that it comprises:

the device comprises a shell, a first electric control chamber is arranged at the upper part of the shell, and a second electric control chamber is arranged at the lower part of the shell;

the upper air duct assembly is arranged corresponding to the first electric control chamber, an upper air duct for dissipating heat of an electric control device in the first electric control chamber is formed on the upper air duct assembly, the upper air duct is provided with an upper air inlet and an upper air outlet, the upper air duct comprises a first air duct and a second air duct, the upper air inlet comprises a first air inlet communicated with the first air duct and a second air inlet communicated with the second air duct, and the upper air outlet comprises a first air outlet communicated with the first air duct and a second air outlet communicated with the second air duct; and

the lower air duct component is arranged corresponding to the second electric control chamber, a lower air duct for dissipating heat of an electric control device in the second electric control chamber is formed in the lower air duct component, and the lower air duct is provided with a lower air inlet and a lower air outlet;

the first air duct is arranged at the front part of the first electric control chamber, the second air ducts are arranged at the rear part of the first electric control chamber, the number of the second air ducts is two, and the two second air ducts are respectively arranged at two opposite sides of the rear part of the first electric control chamber; or the first air duct and the second air duct are respectively arranged at two opposite sides of the first electric control chamber, the number of the second air ducts is two, and the two second air ducts are respectively arranged at the front end and the rear end of the side of the first electric control chamber.

2. The microwave oven of claim 1, wherein the first air duct is disposed at a front portion of the first electric control chamber and extends in a width direction of the first electric control chamber.

3. The microwave oven of claim 2, wherein an electrical control device is mounted within the first air duct, the electrical control device including a circuit board and a display driver board.

4. The microwave oven of claim 2, wherein the upper duct assembly includes a first fan mounted at the first air inlet or the first air outlet; or the upper air duct assembly comprises two first fans, and the two first fans are respectively installed at the first air inlet and the first air outlet.

5. The microwave oven of claim 1, wherein either or both of the second air ducts are provided with a magnetron assembly.

6. The microwave oven according to claim 1, wherein two second air ducts are respectively disposed at two sides of the rear portion of the first electric control chamber, and a second air outlet of the second air duct is opened toward a side plate of the housing.

7. The microwave oven of claim 6, wherein said upper duct assembly further comprises two second fans, and said two second fans are respectively mounted at air inlet ends of said two second ducts.

8. The microwave oven of claim 6, wherein the upper duct assembly includes two wind scoops disposed at opposite sides of the rear portion of the housing, and two second ducts are formed at the two wind scoops, respectively.

9. The microwave oven of any one of claims 1 to 8, wherein the air intake end of the second air duct communicates with the first air duct.

10. The microwave oven according to claim 9, wherein the number of the second air ducts is two, and an air duct is formed between two of the second air ducts, and the air duct communicates an air inlet end of the second air duct with the first air duct.

11. The microwave oven of claim 9, wherein the lower air duct includes a third air duct and a fourth air duct, the lower air inlet includes a third air inlet in communication with the third air duct and a fourth air inlet in communication with the fourth air duct, and the lower air outlet includes a third air outlet in communication with the third air duct and a fourth air outlet in communication with the fourth air duct.

12. The microwave oven of claim 11, wherein the third air duct is disposed at a front portion of the second electric control chamber, and the fourth air duct is disposed at a rear portion of the second electric control chamber; or the third air duct and the fourth air duct are respectively arranged at two opposite side parts of the second electric control chamber.

13. The microwave oven of claim 11, wherein the third air outlet is open toward a bottom panel or a side panel of the housing; and/or the fourth air outlet is opened towards the bottom plate or the side plate of the shell.

14. The microwave oven of claim 11, wherein a variable frequency assembly is mounted within the third air chute and/or the fourth air chute.

15. The microwave oven of claim 11, wherein the lower duct assembly includes a third fan mounted at the third air inlet; and/or, the lower air duct component comprises a fourth fan, and the fourth fan is arranged at the fourth air inlet.

16. The microwave oven of claim 11, wherein the lower duct assembly further comprises a third wind scooper mounted within a second electrical compartment, the third wind scooper forming the third duct; and/or the lower air duct assembly comprises a fourth air guide cover, the fourth air guide cover is arranged in the second electric control chamber, and the fourth air guide cover forms the fourth air duct.

17. The microwave oven of any one of claims 1 to 8, further comprising a door assembly mounted to the front of the housing, the door assembly including a door panel rotatably mounted to the housing and a decorative panel positioned below the door panel.

18. The microwave oven of claim 17, wherein the decorative panel is provided with blind holes; or the decorative plate is provided with an air inlet hole in a penetrating manner, and the air inlet hole is communicated with the second electric control chamber.