WO2021047101A1 - Electromagnetic heating cooking appliance structure and electromagnetic heating cooking appliance - Google Patents

Abstract

An electromagnetic heating cooking appliance structure and an electromagnetic heating cooking appliance. The electromagnetic heating cooking appliance structure (100) comprises a circuit board (1), shielding members (2, 3), and an electromagnetic sensitive component (11), wherein the circuit board (1) is configured to be arranged in an electromagnetic field of an electromagnetic heating cooking appliance; the shielding members (2, 3) comprise a first shielding member (2) arranged on a first side of the circuit board (1), and the projection of the first shielding member (2) on the circuit board (1) is configured to partially cover the circuit board (1), so that the circuit board (1) is provided with a first region corresponding to the projection of the first shielding member (2), and a second area located outside the projection of the first shielding member (2); and the electromagnetic sensitive component (11) is arranged in the first region of the circuit board (1), thereby reducing the areas of the shielding members (2, 3), facilitating air circulation in the electromagnetic heating cooking appliance structure and improving the overall heat dissipation effect of the electromagnetic heating cooking appliance, such that the user experience is improved.

Description

Electromagnetic heating cooking appliance structure and electromagnetic heating cooking appliance

Related application

This application claims the priority of the Chinese patent application filed on September 9, 2019, the application number is 201921495394.7, and the invention title is "Electromagnetic heating cooking appliance structure and electromagnetic heating cooking appliance".

Technical field

This application relates to the technical field of cooking appliances, in particular to an electromagnetic heating cooking appliance structure and an electromagnetic heating cooking appliance.

Background technique

The circuit board of the electromagnetic heating cooking appliance is equipped with many components that are sensitive to the electromagnetic heating magnetic field, which needs to be shielded magnetic field protection. At present, the circuit board is often used to deal with the overall electromagnetic shielding measure. This kind of overall electromagnetic shielding measure , It is not conducive to the overall heat dissipation of the electromagnetic heating cooking appliance, and the heat dissipation effect is poor, which affects the user experience.

Technical solutions

The main purpose of this application is to propose an electromagnetic heating cooking appliance structure and an electromagnetic heating cooking appliance, aiming to electromagnetically shield electromagnetic sensitive components by means of partial shielding, so as to improve the overall heat dissipation effect of the electromagnetic heating cooking appliance and improve user experience .

In order to achieve the above objectives, the electromagnetic heating cooking appliance structure proposed in this application includes:

A circuit board configured to be arranged in the electromagnetic field of the electromagnetic heating cooking appliance;

The shielding member includes a first shielding member disposed on the first side of the circuit board, and the projection of the first shielding member on the circuit board is arranged to partially cover the circuit board, and is configured to make the circuit The board has a first area corresponding to the projection of the first shield and a second area located outside the projection of the first shield; and,

The electromagnetic sensitive components are arranged in the first area of the circuit board.

Optionally, the electromagnetic sensitive components are arranged on the first side of the circuit board; and/or,

The circuit board has a second side opposite to the first side, the shielding member further includes a second shielding member, the second shielding member is provided on the second side of the circuit board, and the second shielding member is provided on the second side of the circuit board. The projection of the shielding element on the circuit board is directly facing the first area; and/or,

The first shield is a shield plate; and/or,

The electromagnetic sensitive component is arranged on the first side of the circuit board, the first shield is a shielding cover, and the shielding cover is arranged to cover the electromagnetic sensitive component; and/or,

The shielding member is grounded.

Optionally, an air inlet and an air outlet are formed on the shielding cover, and the air inlet is set toward the air outlet end of the fan of the electromagnetic heating cooking appliance.

Optionally, the electromagnetic sensitive components are arranged on the first side of the circuit board;

The electromagnetic heating cooking appliance structure further includes an electromagnetic coil, and the electromagnetic coil is also located on the first side of the circuit board;

The first shield is located between the electromagnetic sensitive component and the electromagnetic coil.

Optionally, the circuit board has a side surface on the first side, and in a direction away from the side surface, the distance between the first shield and the electromagnetic coil is L1, and the L1 At least 0.1mm and no more than 50mm.

Optionally, the L1 is at least 0.5 mm and no more than 20 mm.

Optionally, the electromagnetic coil corresponds to forming a first projection on the circuit board, the electromagnetic sensitive component corresponds to forming a second projection on the circuit board, and the projection area of the second projection is S2;

Wherein, the overlapping area between the first projection and the second projection is S0, and the ratio of S0 to S2 is greater than 0 and does not exceed 0.8.

Optionally, the ratio of S0 to S2 is greater than 0 and does not exceed 0.5.

Optionally, the shielding member further includes a second shielding member arranged on the second side of the circuit board, the projection area of the second shielding member corresponding to the circuit board is S3, and the electromagnetic sensitive element The projected area of the device corresponding to the circuit board is S2, where the ratio of S3 to S2 is at least 1.5; and/or,

The projected area of the electromagnetic coil on the circuit board is S1, the projected area of the electromagnetic sensitive components on the circuit board is S2, and the ratio of S2 to S1 is at least 1.5.

The present application also proposes an electromagnetic heating cooking appliance, the electromagnetic heating cooking appliance includes an electromagnetic heating cooking appliance structure, and the electromagnetic heating cooking appliance structure includes:

A circuit board configured to be arranged in the electromagnetic field of the electromagnetic heating cooking appliance;

The shielding member includes a first shielding member disposed on the first side of the circuit board, and the projection of the first shielding member on the circuit board is arranged to partially cover the circuit board, and is configured to make the circuit The board has a first area corresponding to the projection of the first shield and a second area located outside the projection of the first shield; and,

The electromagnetic sensitive components are arranged in the first area of the circuit board.

Optionally, the electromagnetic sensitive components are arranged on the first side of the circuit board; and/or,

The electromagnetic sensitive components are arranged on a first side of the circuit board, the circuit board has a second side opposite to the first side, the shielding member further includes a second shielding member, the second The shielding element is arranged on the second side of the circuit board, and the projection of the second shielding element on the circuit board is arranged directly to the first area; and/or,

The first shield is a shield plate; and/or,

The electromagnetic sensitive component is arranged on the first side of the circuit board, the first shield is a shielding cover, and the shielding cover is arranged to cover the electromagnetic sensitive component; and/or,

The electromagnetic sensitive components are arranged on the first side of the circuit board, the electromagnetic heating cooking appliance structure further includes an electromagnetic coil, the electromagnetic coil is also located on the first side of the circuit board, and the first shield The component is located between the electromagnetic sensitive component and the electromagnetic coil.

Optionally, the circuit board has a side surface on the first side, and in a direction away from the side surface, the distance between the first shield and the electromagnetic coil is L1, and the L1 At least 0.1mm and no more than 50mm.

Optionally, the L1 is at least 0.5 mm and no more than 20 mm.

Optionally, the electromagnetic coil corresponds to forming a first projection on the circuit board, the electromagnetic sensitive component corresponds to forming a second projection on the circuit board, and the projection area of the second projection is S2;

Wherein, the overlapping area between the first projection and the second projection is S0, and the ratio of S0 to S2 is greater than 0 and does not exceed 0.8.

Optionally, the shielding member further includes a second shielding member arranged on the second side of the circuit board, the projection area of the second shielding member corresponding to the circuit board is S3, and the electromagnetic sensitive element The projected area of the device corresponding to the circuit board is S2, where the ratio of S3 to S2 is at least 1.5; and/or,

The projected area of the electromagnetic coil on the circuit board is S1, the projected area of the electromagnetic sensitive components on the circuit board is S2, and the ratio of S2 to S1 is at least 1.5.

Optionally, it further includes an appliance housing, and an installation cavity is formed inside the appliance housing;

The electromagnetic heating cooking appliance structure is arranged in the installation cavity;

The appliance housing is also provided with a housing air inlet and a housing air outlet communicating with the installation cavity, and a heat exchange is formed between the housing air inlet and the housing air outlet in the installation cavity Wind channel

The electromagnetic heating cooking appliance further includes a fan arranged in the installation cavity, the fan is located on the heat exchange air duct, and is located on the side of the second area away from the first area, and is used to The air outside the air inlet of the casing is drawn into the installation cavity, and after heat exchange is completed in the installation cavity, it is discharged from the air outlet of the casing.

Optionally, the path of the heat exchange air duct passes through the second area and the first area.

Optionally, a diversion rib is further provided in the installation cavity, and the diversion rib defines a diversion groove with at least one opening along the periphery of the fan, and the open end of the diversion groove It is arranged toward the second area and the first area, and is configured to converge and guide the wind blown from the air outlet end of the fan to the second area and the first area.

Optionally, the housing air inlet and the housing air outlet are formed at the bottom of the appliance housing;

The bottom surface of the appliance housing is provided with anti-backflow ribs, the anti-backflow ribs are located on the side of the air outlet of the housing close to the fan, and are configured to guide the wind blown from the air outlet of the housing away from the air outlet. State the direction of the fan.

Optionally, a plurality of supporting feet are provided at the bottom of the appliance housing;

The height difference between the lower end surface of the backflow prevention rib and the lower end surface of the supporting foot is d, and the d is at least 0.5 mm and not more than 1 mm.

In the technical solution provided by the present application, the circuit board has a first area corresponding to the projection of the first shielding member, the electromagnetic sensitive components are arranged in the first area of the circuit board, and the electromagnetic heating In the electromagnetic field of the cooking appliance, shielding is only provided for the electromagnetic sensitive components, reducing the area of the shielding, facilitating air circulation in the structure of the electromagnetic heating cooking appliance, and improving the overall heat dissipation effect of the electromagnetic heating cooking appliance , Which in turn improves the user experience.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

Fig. 1 is a schematic diagram of a three-dimensional exploded structure of a first embodiment of an electromagnetic heating cooking appliance provided by this application;

2 is a schematic diagram of a three-dimensional exploded structure of a second embodiment of the electromagnetic heating cooking appliance provided by this application;

Figure 3 is a schematic side view of the structure of the electromagnetic heating cooking appliance in Figure 2;

4 is a schematic diagram of a three-dimensional exploded structure of a third embodiment of the electromagnetic heating cooking appliance provided by this application;

Fig. 5 shows the half-bridge topology circuit structure of the electromagnetic heating cooking appliance in Fig. 1.

Figure 6 is a schematic top view of the electromagnetic heating cooking appliance in Figure 1;

Figure 7 is a schematic bottom view of the electromagnetic heating cooking appliance in Figure 1;

Fig. 8 is a schematic side view of the structure of the electromagnetic heating cooking appliance in Fig. 1.

Attached icon number description:

Label	name	Label	name
100	Electromagnetic heating cooking appliance structure	5	Appliance housing
1	Circuit board	51	Installation cavity
11	Electromagnetic sensitive components	52	Shell air inlet
2	First shield	53	Shell air outlet
twenty one	Inlet	6	Fan
twenty two	Air outlet	7	Diversion ribs
3	Second shield	8	Backflow prevention rib
4	Coil disk	9	Supporting feet

The realization, functional characteristics, and advantages of the purpose of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Implementation of this application

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of this application, the directional indications are only used to explain in a specific posture (as shown in the drawings). Show) the relative positional relationship, movement, etc. between the components below. If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions related to "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes, and cannot be understood as instructions or implications Its relative importance or implicitly indicates the number of technical features indicated. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and/or" in the full text includes three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, scheme B, or schemes that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that such a combination of technical solutions does not exist. , Is not within the scope of protection required by this application.

The circuit board of the electromagnetic heating cooking appliance is equipped with many components that are sensitive to the electromagnetic heating magnetic field, which needs to be shielded magnetic field protection. At present, the circuit board is often used to deal with the overall electromagnetic shielding measure. This kind of overall electromagnetic shielding measure , It is not conducive to the overall heat dissipation of the electromagnetic heating cooking appliance, and the heat dissipation effect is poor, which affects the user experience.

In view of this, the present application provides an electromagnetic heating cooking appliance. The electromagnetic heating cooking appliance includes an electromagnetic heating cooking appliance structure. As long as it is an electromagnetic heating cooking appliance including the electromagnetic heating cooking appliance structure, it is the content of the present application. FIG. 1 Figure 8 is a schematic diagram of an embodiment of the electromagnetic heating cooking appliance provided by this application.

Please refer to FIGS. 1 to 2 together, the electromagnetic heating cooking appliance structure 100 includes a circuit board 1, a shielding member, and electromagnetic sensitive components 11, and the circuit board 1 is configured to be set in the electromagnetic field of the electromagnetic heating cooking appliance The shielding member includes a first shielding member 2 arranged on the first side of the circuit board 1, and the projection of the first shielding member 2 on the circuit board 1 is arranged to partially cover the circuit board 1. So that the circuit board 1 has a first area corresponding to the projection of the first shielding member 2 and a second area located outside the projection of the first shielding member 2, and the electromagnetic sensitive component 11 is provided with In the first area of the circuit board 1.

In the technical solution provided by the present application, the circuit board 1 has a first area corresponding to the projection of the first shielding member 2, and the electromagnetic sensitive component 11 is provided in the first area of the circuit board 1 In the electromagnetic field of the electromagnetic heating cooking appliance, a shielding piece is provided only for the electromagnetic sensitive component 11, which reduces the area of the shielding piece, facilitates air circulation in the electromagnetic heating cooking appliance structure 100, and improves electromagnetic heating The overall heat dissipation effect of the cooking appliance improves the user experience.

The electromagnetic heating cooking appliance usually includes a coil disk assembly and a circuit board assembly. When the first shield 2 is provided on the circuit board assembly, the electromagnetic heating cooking appliance structure 100 may be an independent component, for example, It may be a circuit board assembly. When the first shield 2 is provided on the housing or other structure of the electromagnetic heating cooking appliance, the electromagnetic heating cooking appliance structure 100 includes a circuit board assembly and an electromagnetic coil, all of which are described above. It is the plan of this application.

It should be noted that the electromagnetic sensitive component 11 is a component provided on the circuit board 1 that needs to be shielded and protected by a magnetic field, for example, a filter capacitor, a differential mode inductor, a common mode inductor, a Y capacitor, etc., for electromagnetic heating Components that are more sensitive to magnetic fields.

It should be noted that in the electromagnetic field of the electromagnetic heating cooking appliance, as long as the first shielding member 2 is provided on the path of the magnetic line of induction of the electromagnetic field passing through the electromagnetic sensitive component 11, it can be better shielded. For the effect of the magnetic field, the electromagnetic sensitive components 11 and the first shielding member 2 can be arranged on the same side of the circuit board 1, or they can be arranged on the opposite side. Specifically, the electromagnetic sensitive components 11 are arranged on the same side. On the first side of the circuit board 1, of course, it can also be arranged on the second side of the circuit board 1 opposite to the first side.

The embodiment of the present application does not limit the specific arrangement form of the first shielding member 2. For example, in an embodiment, the first shielding member 2 is a shielding plate, which can be fixed to the first shielding member 2 by bolt connection. The circuit board 1 or other structures in the electromagnetic heating cooking appliance structure 100 are arranged in this way, the structure is simple, and the arrangement of the first shield 2 is convenient.

Of course, in another embodiment, the first shielding member 2 is a shielding cover, which is configured to cover the electromagnetic sensitive components 11, and can be fixed to the circuit board by bolt connection. 1 or other structures in the electromagnetic heating cooking appliance structure 100, the three-dimensional electromagnetic shielding effect is achieved by providing the shielding cover.

Further, in the embodiment in which the first shielding member 2 is configured as a shielding cover, in order to enhance the heat dissipation effect, an air inlet 21 and an air outlet 22 are formed on the shielding cover, and the air inlet 21 is arranged to face the The air outlet end of the fan 6 of the electromagnetic heating cooking appliance is provided, and the air inlet 21 is a plurality of air holes provided on the side surface of the shielding cover facing the second area, and the air holes are enlarged by the plurality of air holes The circulation of the air in the shielding cover achieves a good heat dissipation effect.

In the embodiment in which the electromagnetic heating cooking appliance structure 100 includes a circuit board assembly and an electromagnetic coil, the electromagnetic heating cooking appliance structure 100 further includes an electromagnetic coil, and the electromagnetic coil and the electromagnetic sensitive component 11 are both located. On the first side of the circuit board 1, the first shielding member 2 is located between the electromagnetic sensitive component 11 and the electromagnetic coil. This arrangement facilitates shielding the magnetic field of the electromagnetic coil and makes the electromagnetic The air in the coil can circulate better, which facilitates the heat dissipation of the electromagnetic coil.

Further, in order to reduce the electromagnetic influence of the electromagnetic coil on the electromagnetic sensitive component 11, in one embodiment, referring to FIG. 3, the circuit board 1 has a side surface located on the first side, along a distance away from the first side. In the direction of the side surface, the distance between the first shield 2 and the electromagnetic coil is L1, and the L1 is at least 0.1 mm and not more than 50 mm. The spacing between the electromagnetic coils is set to be between 0.1mm and 50mm. Considering that the electromagnetic influence is minimized, it is easy to manufacture, and the overall size of the electromagnetic heating cooking appliance is not too large, which is a better range. Yes, the L1 is at least 0.5 mm and no more than 20 mm. This arrangement facilitates the realization of the structure.

Furthermore, the electromagnetic sensitive component 11 may be arranged at a position far away from the electromagnetic coil. Specifically, in an embodiment, the electromagnetic coil correspondingly forms a first projection on the circuit board 1. The electromagnetic sensitive component 11 correspondingly forms a second projection on the circuit board 1, and the projection area of the second projection is S2, wherein the overlapping area between the first projection and the second projection is S0, And the ratio of S0 to S2 is greater than 0 and does not exceed 0.8. This setting can further reduce the electromagnetic influence of the coil by reducing the size of the overlapping setting area. It has a better effect. A better range is S0 and S2. The ratio of is greater than 0 and does not exceed 0.5. This setting facilitates the realization of the structure.

Further considering the improvement of the magnetic avoidance effect, the projected area of the electromagnetic coil corresponding to the circuit board 1 is S1, and the projected area of the electromagnetic sensitive component 11 corresponding to the circuit board 1 is S2, S2 and The ratio of S1 is at least 1.5, which is set so that the first shielding member 2 shields more electromagnetic wires, and further improves the magnetism avoidance effect.

Considering the effect of increasing electromagnetic shielding, in one embodiment, referring to FIG. 4, the circuit board 1 has a second side opposite to the first side, and the shielding member further includes a second shielding member 3. The second shielding member 3 is provided on the second side of the circuit board 1, and the projection of the second shielding member 3 on the circuit board 1 is directly facing the first area. By setting the first shielding member 3 The component 2 and the second shielding component 3 further shield the electromagnetic influence of the electromagnetic on the electromagnetic sensitive component 11, and have a better effect.

Further, the projection area of the second shield 3 corresponding to the circuit board 1 is S3, and the projection area of the electromagnetic sensitive component 11 corresponding to the circuit board 1 is S2, where S3 and S2 The ratio of is at least 1.5, so that the second shield 3 shields more electromagnetic wires, and further improves the magnetic avoidance effect. It should be noted that the above-mentioned about the first shield 2 and the second shield The form of setting the projection area of part 3 can be selected by one or both at the same time.

In the electromagnetic heating cooking appliance, the coil disk 3 carries the electromagnetic coil to form a coil disk assembly, and the electromagnetic coil provides a variable magnetic field to heat the conductive magnet placed above the electromagnetic coil. Referring to Figure 5, Figure 5 shows the half-bridge topology circuit structure of the electromagnetic heating cooking appliance. When the half-bridge topology circuit structure is working, two IGBTs are turned on at high speed in turn to drive the electromagnetic coil to generate a changing magnetic field. .

In addition, in the embodiment of the present application, both the first shielding member 2 and the second shielding member 3 are grounded, and this arrangement facilitates a good shielding effect.

The heat dissipation of the electromagnetic heating cooking appliance is also the content of the present application. Specifically, please refer to FIGS. 6 to 8. In an embodiment, the electromagnetic heating cooking appliance includes an appliance housing 5 and an electromagnetic heating cooking appliance structure 100. An installation cavity 51 is formed inside the appliance housing 5, the electromagnetic heating cooking appliance structure 100 is arranged in the installation cavity 51, and the appliance housing 5 is also provided with a housing air inlet communicating with the installation cavity 51 52 and the housing air outlet 53, between the housing air inlet 52 and the housing air outlet 53 to form a heat exchange air duct in the installation cavity 51, the electromagnetic heating cooking appliance also includes The fan 6 in the installation cavity 51, the fan 6 is on the heat exchange air duct, and is located on the side of the second area away from the first area, and is used to remove the air inlet 52 of the housing Air is drawn into the installation cavity 51. After the heat exchange is completed in the installation cavity 51, it is discharged from the air outlet 53 of the housing. The fan 6 is installed in the installation cavity 51 to make the installation The air in the cavity 51 and the outside air form convection, which facilitates the heat dissipation of the electromagnetic heating cooking appliance.

The circuit board 1 is provided with a plurality of components, which are distributed in the second area and the first area. Considering that the heat-generating components are sufficiently dissipated, specifically, the circuit board 1 is provided with heat-generating components The heating element is arranged in the heat exchange air duct, and the heating element is concentratedly dissipated. It should be noted that in this embodiment, the electromagnetic sensitive element 11 also includes heating elements, Heat dissipation treatment is also required. In one embodiment, the path of the heat exchange air duct passes through the second area and the first area, so as to adequately perform heat-generating components mounted on the circuit board 1. Heat dissipation.

Further, the electromagnetic sensitive component 11 is arranged adjacent to the fan 6 and/or the housing air outlet 53, and the area close to the fan 6 and/or the housing air outlet 53 has a better heat dissipation effect. , Which is more conducive to the heat dissipation of the electromagnetic sensitive components 11, and has a better effect.

There are many heating components in the electromagnetic heating cooking appliance. For example, insulated gate bipolar transistors, bridge stacks, and fuse tubes are components with higher heat generation. These components can also be placed close to the The fan 6 and/or the air outlet 53 of the casing can dissipate heat in a targeted manner, and the heat dissipation effect is better.

In order to better guide the wind of the fan 6 to the second area and the first area, in one embodiment, the installation cavity 51 is further provided with a guide rib 7 which is 7 A diversion groove with at least one end opened along the periphery of the fan 6 is defined, and the opening end of the diversion groove faces the second area and the second installation area for connecting the fan 6 The wind blown from the outlet end of the wind converges and guides to the second area and the second installation area, and the diversion groove fits the shape of the fan 6 so that more wind is emitted from the fan 6 The ground is guided to the air outlet 53 of the housing, the wind gathering effect is better, the wind loss is reduced, and the electromagnetic sensitive component 11 can be dissipated to the maximum.

In the technical solution of the present application, the type of the fan 6 is not limited. It can be an axial fan 6, or a centrifugal fan 6, etc., in one embodiment, the fan 6 is an axial fan 64, and The axial flow fan 6 takes in air from one end and discharges the air from the circumferential direction of the casing of the axial flow fan 6 to facilitate the heat dissipation of the components in the electromagnetic heating cooking appliance.

Taking into account the user’s experience, the housing air inlet 52 and the housing air outlet 53 of the electromagnetic heating cooking appliance are usually arranged at the bottom of the appliance housing 5, and at this time, in order to reduce the housing air outlet 53 The movement of air between the housing and the housing air inlet 52. In one embodiment, the housing air inlet 52 and the housing air outlet 53 are formed at the bottom of the appliance housing 5, and the appliance housing The bottom surface of the body 5 is provided with anti-backflow ribs 8, which are located on the side of the casing air outlet 53 close to the fan 6, and are used to guide the wind blowing from the casing air outlet 53 away The direction of the fan 6 minimizes the return of the hot air emitted from the air outlet 53 of the housing to the air inlet 52 of the housing, which has a better effect.

In order to obtain a better anti-reflux effect, the height of the anti-reflux ribs 8 can be set as high as possible, but it cannot be higher than the supporting feet 9 supporting the appliance housing 5, specifically, the appliance housing A plurality of supporting feet 9 are provided at the bottom of 5, the height difference between the lower end surface of the backflow prevention rib 8 and the lower end surface of the supporting leg 9 is d, and the d is at least 0.5mm and not more than 1mm Such arrangement enables the anti-backflow ribs 8 to have a better anti-backflow effect, and also enables the supporting feet 9 to support the appliance housing 5 well.

The above are only optional embodiments of this application, and do not limit the scope of this application. Under the concept of this application, any equivalent structural transformation made by using the content of the specification and drawings of this application, or direct/indirect use Other related technical fields are included in the scope of patent protection of this application.

Claims (20)

1. An electromagnetic heating cooking appliance structure used in an electromagnetic heating cooking appliance, wherein the electromagnetic heating cooking appliance structure includes:

   A circuit board configured to be arranged in the electromagnetic field of the electromagnetic heating cooking appliance;

   The shielding member includes a first shielding member disposed on the first side of the circuit board, and the projection of the first shielding member on the circuit board is arranged to partially cover the circuit board, and is configured to make the circuit The board has a first area corresponding to the projection of the first shield and a second area located outside the projection of the first shield; and,

   The electromagnetic sensitive components are arranged in the first area of the circuit board.
2. The electromagnetic heating cooking appliance structure according to claim 1, wherein the electromagnetic sensitive component is provided on the first side of the circuit board; and/or,

   The circuit board has a second side opposite to the first side, the shielding member further includes a second shielding member, the second shielding member is provided on the second side of the circuit board, and the second shielding member is provided on the second side of the circuit board. The projection of the shielding element on the circuit board is directly facing the first area; and/or,

   The first shield is a shield plate; and/or,

   The electromagnetic sensitive component is arranged on the first side of the circuit board, the first shield is a shielding cover, and the shielding cover is arranged to cover the electromagnetic sensitive component; and/or,

   The shielding member is grounded.
3. The electromagnetic heating cooking appliance structure according to claim 2, wherein an air inlet and an air outlet are formed on the shielding cover, and the air inlet is arranged toward the air outlet end of the fan of the electromagnetic heating cooking appliance.
4. The electromagnetic heating cooking appliance structure according to claim 1, wherein the electromagnetic sensitive component is arranged on the first side of the circuit board;

   The electromagnetic heating cooking appliance structure further includes an electromagnetic coil, and the electromagnetic coil is also located on the first side of the circuit board;

   The first shield is located between the electromagnetic sensitive component and the electromagnetic coil.
5. The electromagnetic heating cooking appliance structure according to claim 4, wherein the circuit board has a side surface on the first side, and in a direction away from the side surface, the first shield and the electromagnetic The distance between the coils is L1, and the L1 is at least 0.1 mm and not more than 50 mm.
6. The electromagnetic heating cooking appliance structure according to claim 5, wherein the L1 is at least 0.5 mm and not more than 20 mm.
7. The electromagnetic heating cooking appliance structure according to claim 4, wherein the electromagnetic coil corresponds to forming a first projection on the circuit board, and the electromagnetic sensitive component corresponds to forming a second projection on the circuit board, so The projection area of the second projection is S2;

   Wherein, the overlapping area between the first projection and the second projection is S0, and the ratio of S0 to S2 is greater than 0 and does not exceed 0.8.
8. 8. The electromagnetic heating cooking appliance structure according to claim 7, wherein the ratio of S0 to S2 is greater than 0 and does not exceed 0.5.
9. The electromagnetic heating cooking appliance structure according to claim 7, wherein the shielding member further comprises a second shielding member provided on the second side of the circuit board, the second shielding member corresponding to the circuit board The projected area of is S3, and the projected area of the electromagnetic sensitive component on the circuit board is S2, where the ratio of S3 to S2 is at least 1.5; and/or,

   The projected area of the electromagnetic coil on the circuit board is S1, the projected area of the electromagnetic sensitive components on the circuit board is S2, and the ratio of S2 to S1 is at least 1.5.
10. An electromagnetic heating cooking appliance, which includes an electromagnetic heating cooking appliance structure, and the electromagnetic heating cooking appliance structure includes:

    A circuit board configured to be arranged in the electromagnetic field of the electromagnetic heating cooking appliance;

    The shielding member includes a first shielding member disposed on the first side of the circuit board, and the projection of the first shielding member on the circuit board is arranged to partially cover the circuit board, and is configured to make the circuit The board has a first area corresponding to the projection of the first shield and a second area located outside the projection of the first shield; and,

    The electromagnetic sensitive components are arranged in the first area of the circuit board.
11. The electromagnetic heating cooking appliance according to claim 10, wherein the electromagnetic sensitive component is provided on the first side of the circuit board; and/or,

    The electromagnetic sensitive components are arranged on a first side of the circuit board, the circuit board has a second side opposite to the first side, the shielding member further includes a second shielding member, the second The shielding element is arranged on the second side of the circuit board, and the projection of the second shielding element on the circuit board is arranged directly to the first area; and/or,

    The first shield is a shield plate; and/or,

    The electromagnetic sensitive component is arranged on the first side of the circuit board, the first shield is a shielding cover, and the shielding cover is arranged to cover the electromagnetic sensitive component; and/or,

    The electromagnetic sensitive components are arranged on the first side of the circuit board, the electromagnetic heating cooking appliance structure further includes an electromagnetic coil, the electromagnetic coil is also located on the first side of the circuit board, and the first shield The component is located between the electromagnetic sensitive component and the electromagnetic coil.
12. The electromagnetic heating cooking appliance according to claim 11, wherein the circuit board has a side surface on the first side, and in a direction away from the side surface, the first shield and the electromagnetic coil The distance between them is L1, and the L1 is at least 0.1 mm and no more than 50 mm.
13. The electromagnetic heating cooking appliance according to claim 12, wherein said L1 is at least 0.5 mm and not more than 20 mm.
14. The electromagnetic heating cooking appliance according to claim 11, wherein the electromagnetic coil corresponds to forming a first projection on the circuit board, and the electromagnetic sensitive component corresponds to forming a second projection on the circuit board, and the The projection area of the second projection is S2;

    Wherein, the overlapping area between the first projection and the second projection is S0, and the ratio of S0 to S2 is greater than 0 and does not exceed 0.8.
15. The electromagnetic heating cooking appliance according to claim 11, wherein the shield further comprises a second shield provided on the second side of the circuit board, and the second shield corresponds to the second shield on the circuit board The projected area is S3, and the projected area of the electromagnetic sensitive component on the circuit board is S2, wherein the ratio of S3 to S2 is at least 1.5; and/or,

    The projected area of the electromagnetic coil on the circuit board is S1, the projected area of the electromagnetic sensitive components on the circuit board is S2, and the ratio of S2 to S1 is at least 1.5.
16. The electromagnetic heating cooking appliance according to claim 10, further comprising an appliance housing, and an installation cavity is formed inside the appliance housing;

    The electromagnetic heating cooking appliance structure is arranged in the installation cavity;

    The appliance housing is also provided with a housing air inlet and a housing air outlet communicating with the installation cavity, and a heat exchange is formed between the housing air inlet and the housing air outlet in the installation cavity Wind channel

    The electromagnetic heating cooking appliance further includes a fan arranged in the installation cavity, the fan is located on the heat exchange air duct, and is located on the side of the second area away from the first area, and is used to The air outside the air inlet of the casing is drawn into the installation cavity, and after heat exchange is completed in the installation cavity, it is discharged from the air outlet of the casing.
17. The electromagnetic heating cooking appliance according to claim 16, wherein the path of the heat exchange air duct passes through the second area and the first area.
18. The electromagnetic heating cooking appliance according to claim 17, wherein the installation cavity is further provided with a diversion rib, and the diversion rib defines a diversion with at least one end opening along the periphery of the fan. Slot, the open end of the guide slot is set toward the second area and the first area, and is configured to converge and guide the wind blown from the air outlet end of the fan to the second area and the first area One area.
19. The electromagnetic heating cooking appliance according to claim 18, wherein the housing air inlet and the housing air outlet are formed at the bottom of the appliance housing;

    The bottom surface of the appliance housing is provided with anti-backflow ribs, the anti-backflow ribs are located on the side of the air outlet of the housing close to the fan, and are configured to guide the wind blown from the air outlet of the housing away from the air outlet. State the direction of the fan.
20. The electromagnetic heating cooking appliance according to claim 19, wherein a plurality of supporting feet are provided at the bottom of the appliance housing;

    The height difference between the lower end surface of the backflow prevention rib and the lower end surface of the supporting foot is d, and the d is at least 0.5 mm and not more than 1 mm.