CN106642232A - Microwave oven - Google Patents

Abstract

The invention discloses a microwave oven, comprising: a box body, a cooking cavity and a placement cavity spaced apart from each other are arranged in the box body, through holes are arranged on the side wall of the cooking cavity; a microwave device is provided with In the placement cavity; a rectangular waveguide, the rectangular waveguide is provided with a microwave conduction cavity suitable for microwave passage, the rectangular waveguide is connected between the microwave device and the cooking cavity, the microwave conduction cavity The side wall is provided with a plurality of microwave outlets corresponding to the through holes, and the rectangular waveguide guides the microwave generated by the microwave device to the cooking cavity through the microwave outlets and the through holes; the antenna, the The antenna is arranged in the microwave conducting cavity. The microwave oven of the present invention can improve the uniformity of heating, facilitate structure simplification, and reduce cost and processing difficulty.

Description

Micro-wave oven

technical field

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

Background technique

With the continuous development of microwave heating technology, researchers are paying more and more attention to how to improve the uniformity of microwave heating. Generally, microwave heating systems in microwave ovens are complex and costly.

Contents of the invention

This application is based on the inventor's discovery and recognition of the following facts and problems:

In semiconductor microwave heating, the frequency is usually adjusted by adjusting the phase to achieve uniform heating. However, the inventors found that multiple microwave transmission channels are usually required in the related art, and each channel needs a set of antenna waveguide system and microwave power source to radiate microwaves into the cooking cavity of the microwave oven, but such a structure is complicated and costly.

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the present invention provides a microwave oven with simple structure and low cost.

The microwave oven according to the embodiment of the present invention includes: a box body, a cooking cavity and a placement cavity spaced apart from each other are arranged in the box body, through holes are arranged on the side wall of the cooking cavity; a microwave device, the microwave device Provided in the placement cavity; a rectangular waveguide, the rectangular waveguide is provided with a microwave conduction cavity suitable for microwaves to pass through, the rectangular waveguide is connected between the microwave device and the cooking cavity, and the microwave conduction cavity A plurality of microwave outlets corresponding to the through holes are arranged on the side wall of the side wall, and the rectangular waveguide guides the microwave generated by the microwave device to the cooking cavity through the microwave outlets and the through holes; the antenna, the The antenna is arranged in the microwave conduction cavity.

According to the microwave oven of the embodiment of the present invention, by connecting the rectangular waveguide between the microwave device and the cooking cavity, and setting a plurality of microwave outlets corresponding to the through holes of the cooking cavity on the side wall of the microwave conducting cavity of the rectangular waveguide, the microwave The microwaves generated by the device can be guided into the cooking cavity through multiple microwave outlets and via holes, so as to realize multi-port radiation, which can improve the uniformity of heating, avoiding the use of multiple microwave transmission channels in the related art, and making each microwave transmission channel Problems such as the complex structure caused by the channel corresponding to a set of antenna waveguide system and microwave power source are conducive to simplifying the structure, reducing cost and processing difficulty.

Optionally, the microwave outlet is formed in a strip shape.

Specifically, the angle between the extension direction of the microwave outlet and the center line of the broad side of the rectangular waveguide is α, 0<α<90°.

Specifically, the angle between the extension direction of the microwave outlet and the narrow side of the rectangular waveguide is β, and 0<β≤90°.

Specifically, the length of the microwave outlet is L, where L=λ/2, where λ=c/f, c is the speed of light, and f is the working frequency.

Specifically, L=60mm.

Optionally, the width of the microwave outlet is W, where W=10mm.

Optionally, a plurality of microwave outlets are arranged in parallel, and the distance between the central axes of two adjacent microwave outlets is H, H=λ/2, where λ=c/f, c is the speed of light, f for the working frequency.

Optionally, the working frequency f of the microwave oven satisfies: 2.4GHz≤f≤2.5GHz.

According to some embodiments of the present invention, a plurality of through holes are provided on the side wall of the cooking cavity, and each of the through holes is correspondingly arranged to the microwave outlet.

Optionally, the microwave device is a semiconductor microwave device or a magnetron.

Description of drawings

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

Fig. 2 is a diagram of a current distribution of a rectangular waveguide wall according to an embodiment of the present invention.

Reference signs:

Microwave oven 10000;

Cooking chamber 1; rectangular waveguide 2; microwave outlet 21; antenna 3.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Axial", "Radial", "Circumferential", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

A microwave oven 100 according to an embodiment of the present invention will be described below with reference to FIGS. 1-2 . The microwave oven 100 can be used to heat food.

As shown in FIG. 1 , a microwave oven 100 according to an embodiment of the present invention may include a cabinet, a microwave device and a rectangular waveguide 2 .

Specifically, a cooking cavity 1 and a placement cavity are provided in the box, which are spaced apart from each other. For example, a partition is arranged in the box to separate the cooking cavity 1 and the placement cavity from the box. Food to be heated can be placed in the cooking cavity 1 , and other related structures of the microwave oven 100 such as microwave devices and rectangular waveguides 2 can be placed in the cavity. For example, the rectangular waveguide 2 can be arranged in the placement cavity and welded on the outer wall of the cooking cavity 1 .

Optionally, the microwave device is a semiconductor microwave device or a magnetron, which is simple and reliable.

The microwave device can be used to generate microwaves, and the microwaves generated by the microwave device are transmitted into the cooking cavity 1 so as to heat the food in the cooking cavity 1 .

The rectangular waveguide 2 is provided with a microwave conduction cavity suitable for the passage of microwaves, the antenna 3 is arranged in the microwave conduction cavity, and the rectangular waveguide 2 is connected between the microwave device and the cooking cavity 1 . Specifically, the microwaves generated by the microwave device can be directly transmitted into the microwave conduction chamber, and the microwaves can be conducted into the cooking cavity 1 under the further radiation of the antenna 3 in the microwave conduction cavity to heat the food in the cooking cavity 1 . During this process, the arrangement of the antenna 3 facilitates the uniform conduction of the microwaves into the cooking cavity 1, improving the microwave heating efficiency and heating uniformity.

Specifically, the side wall of the cooking cavity 1 is provided with via holes, and the side wall of the microwave conduction cavity is provided with a plurality of microwave outlets 21 corresponding to the via holes, and the rectangular waveguide 2 passes the microwave generated by the microwave device through the microwave outlets 21 and The via holes lead to the cooking chamber 1 . For example, a large via hole is provided on the side wall of the cooking chamber 1 , and the via hole corresponds to a plurality of microwave outlets 21 on the side wall of the microwave conduction cavity. Of course, the present invention is not limited thereto. In some other embodiments, a plurality of via holes may also be provided on the side wall of the cooking chamber 1, and the plurality of via holes are provided in one-to-one correspondence with the plurality of microwave outlets 21, for example, as shown in FIG. 1, the rectangular waveguide 2 is formed in a substantially L-shape, and a plurality of microwave outlets 21 are spaced apart in the direction in which the rectangular waveguide 2 extends.

Specifically, the microwaves generated by the microwave device can be directly transmitted to the microwave cavity, and under the further radiation of the antenna 3, the microwaves can be conducted into the cooking cavity 1 through a plurality of microwave outlets 21 and via holes to heat the cooking cavity 1. food. In this way, multi-port radiation can be realized, which can improve the uniformity of heating, and avoid the complex structure caused by the use of multiple microwave transmission channels in the related art, and make each microwave transmission channel correspond to a set of antenna waveguide system and microwave power source And other problems, it is beneficial to simplify the structure, reduce the cost and processing difficulty.

According to the microwave oven 100 of the embodiment of the present invention, the rectangular waveguide 2 is connected between the microwave device and the cooking cavity 1, and a plurality of holes corresponding to the through holes of the cooking cavity 1 are arranged on the side wall of the microwave conducting cavity of the rectangular waveguide 2. Microwave outlet 21, so that the microwaves generated by the microwave device can be guided into the cooking cavity 1 through multiple microwave outlets 21 and via holes, so as to realize multi-port radiation, which can improve the uniformity of heating and avoid the use of multiple microwaves in the related art. transmission channels, and make each microwave transmission channel correspond to a set of antenna waveguide system and microwave power source, resulting in complex structure and other problems, which is conducive to simplifying the structure, reducing cost and processing difficulty.

According to some embodiments of the present invention, the microwave outlet 21 is formed in a strip shape. For example, the microwave outlet 21 is formed in an elongated rectangular shape, or the microwave outlet 21 is formed in an elongated shape with a rectangular center and semicircular ends.

Specifically, those skilled in the art can understand that the rectangular waveguide 2 has a wide side and a narrow side. The wide sides are located on the side walls of the cooking cavity 1 . Specifically, as shown in Figure 2, there are longitudinal and transverse current components on the broadside of the rectangular waveguide 2, the transverse component is cosine-distributed along the broadside and zero at the center, the longitudinal component is sinusoidally distributed along the broadside, and the center at the maximum. On the narrow side of the rectangular waveguide 2, only transverse current is distributed along the narrow side.

Further, when the broad side of the rectangular waveguide 2 is located on the side wall of the cooking chamber 1, the angle between the extending direction of the microwave outlet 21 and the center line of the broad side of the rectangular waveguide 2 is α, 0<α<90° , that is to say, the longitudinal direction of the microwave outlet 21 is neither perpendicular nor parallel to the center line of the wide side of the rectangular waveguide 2 . This allows the microwave outlet 21 to be located away from the center line of the broadside, at least to a certain extent, so that the microwave outlet 21 can cut the current line, so that the current is excited at the microwave outlet 21, and the interrupted current is transmitted in the form of a displacement current, and then The microwave in the microwave conduction cavity is radiated into the cooking cavity 1 through the microwave outlet 21, so as to improve the transmission efficiency of the waveguide.

In some other embodiments, when the narrow side of the rectangular waveguide 2 is located on the side wall of the cooking chamber 1, the angle between the extension direction of the microwave outlet 21 and the narrow side of the rectangular waveguide 2 is β, 0<β≤90 °. That is to say, the length direction of the microwave outlet 21 is not parallel to the narrow side of the rectangular waveguide 2, so that the microwave outlet 21 can cut the electromagnetic wire, so that the current is excited at the microwave outlet 21, and the interrupted current is transmitted in the form of displacement current. Furthermore, the microwaves in the microwave conduction cavity are radiated into the cooking cavity 1 through the microwave outlet 21, thereby improving the transmission efficiency of the waveguide.

Specifically, as shown in FIG. 1 , the length of the microwave outlet 21 is L, where L=λ/2, where λ=c/f, c is the speed of light, and f is the working frequency. The speed of light mentioned here refers to the propagation speed of light in the air, that is, c=300000km/s. For example, when 2.4GHz≤f≤2.5GHz, optionally, L is 60mm, 61mm, or 62.5mm. Thus, the size of the microwave outlet 21 is optimized.

Specifically, the width of the microwave outlet 21 is W, where W=10mm. Thus, the size of the microwave outlet 21 is optimized.

In a further embodiment of the present invention, as shown in Figure 1, a plurality of microwave outlets 21 are arranged in parallel, and the distance between the central axes of two adjacent microwave outlets 21 is H, H=λ/2, where λ= c/f, c is the speed of light, and f is the working frequency. The speed of light mentioned here refers to the propagation speed of light in the air, that is, c=300000km/s. For example, when 2.4GHz≤f≤2.5GHz, optionally, H is 60mm, 61mm, or 62mm. Thus, the arrangement of multiple microwave outlets 21 is optimized.

A microwave oven 100 according to an embodiment of the present invention is described below with reference to FIG. 1 . As shown in FIG. 1 , a microwave oven 100 of the present invention includes a box body, a semiconductor microwave device and a rectangular waveguide 2 .

Specifically, a cooking cavity 1 and a placement cavity are provided in the box, and food to be heated can be placed in the cooking cavity 1 , and semiconductor microwave devices and rectangular waveguides 2 can be placed in the placement cavity. The rectangular waveguide 2 can be arranged in the placement cavity and welded on the outer wall of the cooking cavity 1 .

The semiconductor microwave device can be used to generate microwaves, and the microwaves generated by the semiconductor microwave device are transmitted into the cooking cavity 1 so as to heat the food in the cooking cavity 1 .

The rectangular waveguide 2 is provided with a microwave conducting cavity suitable for passing microwaves, the antenna 3 is arranged in the microwave conducting cavity, and the rectangular waveguide 2 is connected between the semiconductor microwave device and the cooking cavity 1 . The side wall of the cooking cavity 1 is provided with a plurality of via holes, and the side wall of the microwave conduction cavity is provided with a plurality of microwave outlets 21 corresponding to the via holes. The rectangular waveguide 2 passes the microwave generated by the semiconductor microwave device through the microwave outlet. 21 and the via hole lead to the cooking cavity 1.

Specifically, the microwaves generated by the semiconductor microwave device can be directly transmitted to the microwave cavity, and under the further radiation of the antenna 3, the microwaves can be conducted into the cooking cavity 1 through a plurality of microwave outlets 21 and via holes to heat the cooking cavity 1 food. In this way, multi-port radiation can be achieved, which can improve the uniformity of heating, and avoid the structure caused by the use of multiple microwave transmission channels in the related art, and make each microwave transmission channel correspond to a set of antenna 3 waveguide systems and microwave power sources Complexity and other issues are conducive to simplifying the structure, reducing cost and processing difficulty.

The microwave outlet 21 is formed in an elongated rectangular shape. Specifically, the broad side of the rectangular waveguide 2 is located on the side wall of the cooking cavity 1 . Specifically, as shown in Figure 2, there are longitudinal and transverse current components on the broadside of the rectangular waveguide 2, the transverse component is cosine-distributed along the broadside and zero at the center, the longitudinal component is sinusoidally distributed along the broadside, and the center at the maximum.

The angle between the extension direction of the microwave outlet 21 and the center line of the wide side of the rectangular waveguide 2 is α, 0<α<90°, so that the microwave outlet 21 can cut the electromagnetic wire, so that the interrupted current is in the form of displacement current transmission, so that the microwave in the microwave conduction cavity radiates into the cooking cavity 1 through the microwave outlet 21, and the transmission efficiency of the waveguide is improved.

Specifically, as shown in Figure 1, a plurality of microwave outlets 21 are arranged in parallel, and the distance between the central axes of two adjacent microwave outlets 21 is H, H=λ/2, where λ=c/f, c is The speed of light, f is the working frequency, 2.4GHz≤f≤2.5GHz. The length of the microwave outlet 21 is L, where L=λ/2. Optionally, L is 60 mm, the width of the microwave outlet 21 is W, and W=10 mm. This design allows microwaves to radiate energy into the cooking chamber 1 at the place with the highest field strength, ensuring energy transmission efficiency from the semiconductor microwave device to the cooking chamber 1 and reducing transmission loss.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (11)

1. a kind of microwave oven, it is characterised in that include：

Casing, is provided with the cooking cavity and placed cavity being spaced apart from each other in the casing, the side wall of the cooking cavity is provided with via；

Microwave device, the microwave device are located at the placement intracavity；

Rectangular waveguide, is provided with the microwave transmission chamber for being suitable to that microwave passes through in the rectangular waveguide, the rectangular waveguide is connected to institute State between microwave device and the cooking cavity, the side wall in the microwave transmission chamber is provided with and multiple is correspondingly arranged with the via Microwave is exported, and the microwave that the microwave device is produced by the rectangular waveguide is oriented to institute by microwave outlet and the via State cooking cavity；

Antenna, the antenna are located at the microwave transmission intracavity.

2. microwave oven according to claim 1, it is characterised in that the microwave outlet is formed as strip.

3. microwave oven according to claim 2, it is characterised in that the bearing of trend and the square wave of the microwave outlet Angle between the centrage of the broadside led is α, 0 90 ° of ＜ α ＜.

4. microwave oven according to claim 2, it is characterised in that the bearing of trend and the square wave of the microwave outlet Angle between the narrow side led is β, 0 ＜ β≤90 °.

5. microwave oven according to claim 2, it is characterised in that the length of the microwave outlet is L, L=λ/2, wherein λ =c/f, c are the light velocity, and f is operating frequency.

6. microwave oven according to claim 5, it is characterised in that L=60mm.

7. microwave oven according to claim 2, it is characterised in that the width of the microwave outlet is W, W=10mm.

8. microwave oven according to claim 2, it is characterised in that multiple microwaves outlets be arranged in parallel, adjacent two The distance between central axis of the individual microwave outlet is H, and H=λ/2, wherein λ=c/f, c are the light velocity, and f is operating frequency.

9. the microwave oven according to any one of claim 1-8, it is characterised in that operating frequency f of the microwave oven is full Foot：2.4GHz≤f≤2.5GHz.

10. microwave oven according to claim 1, it is characterised in that the side wall of the cooking cavity is provided with multiple mistakes Hole, each described via are correspondingly arranged with microwave outlet.

11. microwave ovens according to claim 1, it is characterised in that the microwave device is semiconductor microactuator wave apparatus or magnetic Keyholed back plate.