CN111156550A

CN111156550A - Microwave oven door and microwave oven

Info

Publication number: CN111156550A
Application number: CN202010087068.3A
Authority: CN
Inventors: 官继红
Original assignee: Shenzhen Megmeet Electrical Co Ltd
Current assignee: Shenzhen Megmeet Electrical Co Ltd
Priority date: 2020-02-11
Filing date: 2020-02-11
Publication date: 2020-05-15

Abstract

The invention relates to the technical field of microwave ovens, in particular to an oven door of a microwave oven and the microwave oven. The metal screen plate is embedded in the metal door body, and a plurality of meshes are arranged on the metal screen plate; the inner panel is arranged on the metal door body and is positioned on one side of the metal mesh plate; the outer panel is arranged on the metal door body and is positioned on the other side of the metal screen plate, wherein the inner panel and the outer panel are transparent, and the outer panel is provided with a metal coating layer. In such a way, the light transmission of the oven door is increased through the mesh holes on the metal mesh plate, so that a user can observe the condition of heating food conveniently, and the microwave leaked through the mesh holes can be shielded by the metal coating layer, so that the microwave leakage is avoided, namely, the microwave leakage amount is not overproof, and meanwhile, the better light transmission is realized, and the user can observe the condition of heating food conveniently.

Description

Microwave oven door and microwave oven

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

A microwave oven is a modern cooking range for heating food with electromagnetic waves. In order to prevent microwave in the microwave oven from leaking from the door, a metal mesh array structure is generally provided on the door to shield the microwave, thereby preventing microwave from leaking from the cavity of the microwave oven and causing harm to the human body.

In the process of implementing the embodiment of the present invention, the inventor of the present invention finds that: at present, the microwave of the microwave oven is shielded by the existing oven door of the microwave oven only through the metal mesh array, and in order to enable the metal mesh array to achieve the effect of shielding the microwave, the aperture of the metal mesh array can only be set below 1mm, and the mesh with the aperture below 1mm has poor light transmission effect, so that the specific conditions of food in the microwave oven are difficult to see clearly, such as whether the food is boiled or discolored, and the user experience is influenced.

[ summary of the invention ]

In order to solve the above technical problems, embodiments of the present invention provide an oven door of a microwave oven, which can ensure that microwave leakage does not exceed a standard, and at the same time, can have better light transmittance, so that a user can observe the condition of heating food conveniently.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides an oven door of a microwave oven, including:

a metal door body;

the metal screen plate is embedded in the metal door body, and a plurality of meshes are arranged on the metal screen plate;

the inner panel is arranged on the metal door body and is positioned on one side of the metal mesh plate;

the outer panel is arranged on the metal door body and is positioned on the other side of the metal screen plate, the inner panel and the outer panel are transparent, and the outer panel is provided with a metal coating layer.

In some embodiments, the mesh openings are round holes or polygonal holes.

In some embodiments, the mesh openings have a diameter of 1.5-7 mm.

In some embodiments, the door further comprises an inner frame mounted to one side of the metal door body and covering a gap between the inner panel and the metal door body.

In some embodiments, sealants are respectively arranged between the inner frame and the inner panel and between the inner frame and the metal door body.

In some embodiments, the door further comprises an outer frame, the outer frame is mounted on the other side of the metal door body, and the outer panel is arranged on the outer frame.

In some embodiments, the inner frame and/or the outer frame are plastic parts.

In some embodiments, the metal mesh plate further comprises a handle, and the handle is arranged on one side of the outer frame away from the metal mesh plate.

In some embodiments, the metal coating has an area resistance of less than 80 ohms.

In order to solve the above technical problem, in a second aspect, an embodiment of the present invention further provides a microwave oven including the oven door as described in the first aspect.

The embodiment of the invention has the following beneficial effects: the oven door of the microwave oven provided by the embodiment of the invention comprises a metal door body, a metal mesh plate, an inner panel and an outer panel. The metal screen plate is embedded in the metal door body, and a plurality of meshes are arranged on the metal screen plate; the inner panel is arranged on the metal door body and is positioned on one side of the metal mesh plate; the outer panel is arranged on the metal door body and is positioned on the other side of the metal screen plate, the inner panel and the outer panel are transparent, and the outer panel is provided with a metal coating layer. By the mode, the metal mesh plate and the metal coating layer can shield microwaves, microwave leakage is prevented, and microwave leakage amount is not more than the national standard. In addition, due to the synergistic effect of the metal coating layers, the light transmission of the oven door is increased by the mesh holes on the metal mesh plate, so that a user can observe the condition of heating food conveniently, microwaves leaked by meshes can be shielded by the metal coating layers, microwave leakage cannot be caused, the microwave leakage amount is guaranteed not to exceed the standard, better light transmission can be realized, and the user can observe the condition of heating food conveniently.

[ description of the drawings ]

One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.

Fig. 1 is an exploded view of a furnace door according to an embodiment of the present invention;

FIG. 2 is an enlarged partial view of the expanded metal sheet 20;

figure 3 is a simulation of the oven door in a microwave field.

[ detailed description ] embodiments

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, an oven door 100 of a microwave oven includes a metal door body 10, a metal mesh plate 20, an inner panel 30, and an outer panel 40. Wherein, the metal mesh plate 20 is inlaid in the metal door body 10, a plurality of meshes 21 are provided on the metal mesh plate 20 for shielding microwaves, the inner panel 30 and the outer panel 40 are respectively located at both sides of the metal mesh plate 20 and are transparent, thereby increasing the light transmittance of the oven door 100, and the condition of heating food can be observed through the meshes 21. In addition, the outer panel 40 is provided with a metal coating layer (not shown), which can shield part of the microwaves, and under the synergistic action of the metal mesh plate 20 and the metal coating layer, the microwave leakage amount is not exceeded, and meanwhile, the microwave oven has better light transmittance, so that a user can observe the condition of heating food conveniently. It is understood that, in some embodiments, the metal door body 10 is further provided with an outer shell 11, and the metal mesh plate 20 is embedded in the outer shell 11 to be protected by the outer shell 11. It will be appreciated that the housing 11 is made of a transparent material, such as a high temperature resistant transparent plastic or the like.

For the metal door 10 and the metal mesh plate 20, the metal door 10 serves as a framework of the oven door 100 and is used for supporting the metal mesh plate 20. In some embodiments, the metal door 10 may be made of metal, which not only can further shield the microwave, but also facilitates the installation of the metal mesh plate 20, such as: the metal mesh plate 20 and the metal door body 10 are connected in a spot welding mode, or the metal mesh plate 20 and the metal door body 10 are designed into a whole, and meshes 21 with certain size and spacing are manufactured in a stamping or drilling and milling mode.

The mesh plate 20 is provided with a plurality of meshes 21, the plurality of meshes 21 form an array for shielding microwaves and preventing leakage, and in addition, the meshes 21 allow a user to observe the condition of heating food. In some embodiments, the cells 21 are circular holes or polygonal holes, such as quadrangles, pentagons, hexagons, or the like. It will be appreciated that the polygonal cells may be spaced apart and connected to form a grid or honeycomb structure.

In order to increase the light transmission of the oven door 100, in some embodiments, referring to fig. 2, the diameter of the mesh 21 is 1.5-7 mm. The diameter of the mesh 21 is an important factor affecting the shielding effectiveness of the metal mesh plate 20, and taking a cold-rolled iron plate with a thickness of 0.4mm as an example, the shielding effectiveness of the mesh 21 with different apertures for microwaves is shown in the following table 1:

TABLE 1 Effect of opening size on Shielding effectiveness

Size of opening	Shielding effectiveness (dB)
		4mm×4mm	27
5mm×5mm	21
		7mm×7mm	16
9mm×9mm	10

As can be seen from the above table, the larger the mesh 21 is, the lower the shielding effect on the microwave is, and the microwave leakage amount is increased accordingly. The leaked microwaves are absorbed by the metal coating layer provided on the outer panel 40. The metal coating absorbs the microwaves and causes a certain amount of temperature rise, and thus the temperature of the outer panel 40 rises. The shielding effectiveness is related to the temperature rise of the outer panel 40 as shown in table 2 below:

TABLE 2 relationship between shielding effectiveness and outside panel temperature rise

Shielding effectiveness (dB)	Intracavity power (W)	Temperature rise (. degree. C.) of panel
			22.5	1250	14.35
28	1250	4.04
			32.5	1250	1.43
38	1250	0.40

As the size of the mesh 21 increases, the shielding efficiency is greatly reduced while the transmittance becomes good, i.e., the amount of leakage of microwaves increases sharply. As can be seen from the data in tables 1 and 2, in order to control the leakage of the microwave to meet the national standards and also to control the temperature rise of the outer panel 40 to be a proper value, the diameter of the mesh 21 should be 1.5mm to 7 mm. The mesh 21 of less than 1.5mm does not effectively improve the transmittance of the door 100. The diameter of the mesh 21 larger than 7mm may cause excessive microwave leakage and excessive temperature rise of the outer panel 40, which may cause scald to the user.

The inner panel 30 is mounted on the metal door 10 and is positioned at one side of the metal mesh plate 20. The inner panel 30 is transparent, i.e. made of a transparent material, such as glass, plexiglass or a high temperature resistant transparent plastic. The inner panel 30 is used for separating water vapor in the oven cavity of the microwave oven, preventing the water vapor from immersing the metal mesh plate 20 to generate water accumulated in the door, not only being difficult to clean but also being easy to feed the metal mesh plate 20.

In some embodiments, referring to fig. 1, the oven door further includes an inner frame 50, the inner frame 50 is mounted on one side of the metal door 10, a user protects the metal door 10 from being corroded by moisture in the oven cavity, and the inner frame 50 covers a gap between the inner panel 30 and the metal door 10 to further seal the oven door 100, so that moisture can be prevented from entering the oven door 100 from the gap.

It can be understood that in some embodiments, sealing glue is disposed between the inner frame 50 and the inner panel 30, and between the inner frame 50 and the metal door 10, so as to further increase the sealing performance of the oven door 100.

The outer panel 40 is mounted on the metal door 10 and located on the other side of the metal mesh plate 20, wherein the outer panel 40 is transparent, and the outer panel 40 is provided with a metal coating layer. It is understood that the metal coating layer can be disposed on the side of the outer panel 40 close to the expanded metal sheet 20, on the side of the outer panel 40 away from the expanded metal sheet 20, or on both sides of the outer panel 40. The metal coating layer is a metal film with high transparency and high microwave shielding function, and is formed by mixing a metal material (such as metal silver) and a dielectric medium (such as quartz glass) and then compounding the mixture on at least one side of the outer panel 40 by electron beam evaporation or ion beam sputtering and other methods, so that microwave leakage is prevented, the transparency is good, and the heating state of food in the oven can be observed conveniently. In addition, the outer panel 40 is also made of a transparent material, such as glass, plexiglass, or high-temperature-resistant transparent plastic, to increase light transmittance.

In some embodiments, the oven door is simulated in the microwave field, the thickness of the metal mesh plate of the oven door is 0.4mm, the diameter of the mesh hole is 7mm, and the thickness of the metal coating layer is 1 um. The simulation result is shown in fig. 3, the ordinate is the shielding energy efficiency in dB, the abscissa is the microwave frequency in GHz, and r is the sheet resistance of the metal coating layer. As can be seen from fig. 3, the higher the sheet resistance of the metal plating layer, the worse the shielding energy efficiency. In order to ensure certain shielding energy efficiency, in some embodiments, the surface resistance of the metal coating layer is less than 80 ohms, so that microwaves leaked out of the mesh can be effectively shielded, and the microwaves are prevented from leaking.

In some embodiments, the door further includes an outer frame 60, the outer frame 60 is mounted on the other side of the metal door 10, and the outer panel 40 is disposed on the outer frame 60. The outer frame 60 is used for wrapping the metal door body 10 to protect the metal door body 10, and on the other hand, facilitates installation of the outer panel 40.

It can be understood that the inner frame 50 and/or the outer frame 60 are plastic parts, which not only have good corrosion resistance, but also make the whole structure of the oven door 100 beautiful and easy to install.

In some embodiments, the oven door 100 further comprises a handle 70, and the handle 70 is disposed on a side of the outer frame 60 away from the metal mesh plate 20 for facilitating the user to open and close.

The embodiment of the present invention further provides a microwave oven, the microwave oven includes the above-mentioned oven door 100, and for the structure and function of the oven door 100, reference may be made to the above-mentioned embodiment, and details are not repeated here.

The embodiment of the invention has the following beneficial effects: the oven door 100 of the microwave oven according to the embodiment of the present invention includes a metal door body 10, a metal mesh plate 20, an inner panel 30 and an outer panel 40. The metal mesh plate 20 is embedded in the metal door body 10, and a plurality of meshes 21 are arranged on the metal mesh plate 20; the inner panel 30 is mounted on the metal door body 10, and is positioned on one side of the metal mesh plate 20; and the outer panel 40 is installed on the metal door body 10 and is positioned at the other side of the metal mesh plate 20, wherein the inner panel 30 and the outer panel 40 are both transparent, and the outer panel 40 is provided with a metal coating layer. By the above mode, the metal mesh plate 20 and the metal coating layer can shield microwaves, microwave leakage is prevented, and microwave leakage amount is not more than the national standard. In addition, due to the synergistic effect of the metal coating layer, the light transmission of the oven door 100 is increased by the meshes 21 on the metal screen plate 20, so that a user can conveniently observe the condition of heating food, and the microwave leaked by the meshes 21 can be shielded by the metal coating layer, so that the microwave leakage can not be caused, the microwave leakage amount is guaranteed not to exceed the standard, and meanwhile, the better light transmission can be realized, and the user can conveniently observe the condition of heating food.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oven door of a microwave oven, comprising:

a metal door body (10);

the metal mesh plate (20) is embedded in the metal door body (10), and a plurality of meshes (21) are arranged on the metal mesh plate (20);

the inner panel (30) is mounted on the metal door body (10) and is positioned on one side of the metal mesh plate (20);

the outer panel (40) is installed on the metal door body (10) and located on the other side of the metal mesh plate (20), the inner panel (30) and the outer panel (40) are transparent, and the outer panel (40) is provided with a metal coating layer.

2. The oven door according to claim 1, characterized in, that the mesh openings (21) are round or polygonal.

3. The oven door according to claim 1, characterized in, that the diameter of the mesh (21) is 1.5-7 mm.

4. The oven door according to claim 1, further comprising an inner frame (50), wherein the inner frame (50) is mounted to one side of the metal door body (10), and the inner frame (50) covers a gap between the inner panel (30) and the metal door body (10).

5. The oven door according to claim 4, characterized in that a sealant is provided between the inner frame (50) and the inner panel (30) and between the inner frame (50) and the metal door body (10).

6. The oven door according to claim 1, further comprising an outer frame (60), wherein the outer frame (60) is mounted at the other side of the metal door body (10), and the outer panel (40) is disposed on the outer frame (60).

7. The oven door according to any one of claims 4 to 6, characterized in, that the inner frame (50) or/and the outer frame (60) is a plastic piece.

8. The oven door according to claim 7, further comprising a handle (70), wherein the handle (70) is disposed on a side of the outer frame (60) away from the metal mesh plate (20).

9. The oven door of claim 1, wherein the sheet resistance of the metal coating is less than 80 ohms.

10. A microwave oven, characterized in, that it comprises an oven door (100) according to any of claims 1-9.