CN1300177A

CN1300177A - Microwave oven with homogeneously heating wave guide box

Info

Publication number: CN1300177A
Application number: CN 99117280
Authority: CN
Inventors: 陈锦聪; 汪贵富
Original assignee: Shunde Gelanshi Electric Appliance Factory Co Ltd
Current assignee: Guangdong Galanz Microwave Oven and Electrical Appliance Manufacturing Co Ltd
Priority date: 1999-12-13
Filing date: 1999-12-13
Publication date: 2001-06-20
Anticipated expiration: 2019-12-13
Also published as: CN1112834C

Abstract

The present invention discloses a microwave oven with uniformly-heating waveguide box, and is characterized by that the waveguide box of general microwave oven is improved into the waveguide box with three microwave inlets, and said three microwave inlets are arranged according to upper and lower two zones, in which a zone is made into the rectangular form, and its area is larger than total area of other two microwave inlets, another zone contains two inlets, and the form of said two inlets can be formed into right angle by using rectangular pattern, and the diagonal lines of said zone are symmetrical. Said waveguide box possesses a horizontal wall surface and a slope wall surface, said horizontal wall surface is a short connecting surface, and parallel to magnetic control tube antenna. Said invention can uniformly heat food, and can raise thermal efficiency.

Description

Microwave oven with homogeneously heating wave guide box

The present invention relates to microwave oven, specifically relate to make the evenly microwave oven of the wave guide box of heating of food a kind of having.

Microwave oven is to utilize the microwave energy heating to place the cooking appliance of the food in the chamber, its principle is to utilize the magnetron in the microwave oven to launch a kind of microwave, this microwave by food absorption after, the hydrone of food produces the higher-order of oscillation of 2450MHz, comes cooking food by the frictional heat that vibration is produced.It is different with coal stove, electric furnace, steam stove, be not from outside to inside by stir-frying but from the inside to the outside by interior can heat food, and microwave cookedly generally can not stir, therefore, require microwave to incide on the food equably.Otherwise the inconsistent phenomenon of food cooking level can appear.For this reason, wave guide box all is housed on the chamber sidewall of common microwave stove, and has microwave entrance, chamber and magnetron are coupled together.Microwave by magnetron is launched enters wave guide box, the microwave entrance on wave guide box, and radiation is advanced in the chamber.According to the opening number of microwave being sent into chamber, microwave oven can be divided into the type that singly enters, twoly enter type and enter type more.

Fig. 1, Fig. 2 are the schematic diagrames of the traditional type that singly enters microwave oven, it comprises chamber 101, pallet 102, motor 103, wave guide box 105, microwave entrance 106, magnetron 107 and magnetron antenna 108, on a sidewall of chamber 101, have a microwave entrance 106, the arranged outside of this sidewall a wave guide box 105, coat this microwave entrance 106 and connection with it, magnetron 107 is installed at the back of wave guide box 105, the bottom of chamber 101 medially is provided with a pallet 102 with supporting food, and pallet 102 can be driven rotation by motor 103.According to this configuration, magnetron 107 launched microwaves enter wave guide box 105, enter chamber 101 by single microwave entrance 106 of offering on chamber 101 sidewalls again, and then are incident in the food on the pallet 102.This microwave oven with single microwave entrance has following defective: 1, flat food of culinary art such as sea-tangle, squid, pie etc. can not obtain evenly heating, thereby the middle body of food may be because of overheated and burned.2, during the liquid beverage in heating is contained in the container (as milk bottle, coffee cup etc.) with certain altitude, container top may occur, cause the heating temperature difference, drinking person is not felt well than the more concentrated heating in lower part.3, because food is not as a whole even heating, therefore must prolong cooking time, inabundant heating part is carried out supplementary heating, many consumed energies.

For overcoming the above-mentioned defective that singly enters the type microwave oven, No. 5057660, United States Patent (USP) and European patent disclose proposed on chamber one sidewall, to be provided with two microwave entrances for No. 0478053 pair enter the type microwave ovens.

Fig. 3, Fig. 4 represent No. 5057660 disclosed two longitudinal section and partial, exploded perspective view that enter the type microwave oven of United States Patent (USP) respectively.It has chamber 201, a pair of upper and lower heater 202 is installed in chamber 201, on a sidewall of chamber 201, have a pair of upper and

lower microwave entrance

206a and 206b, on its relative sidewall, a plurality of paired frameworks 204 are set with different interval, shelf brackets 203 can be bearing on the framework 204 by the food height, cover plate 209 is installed in the outside of the chamber 201 at framework 204 back sides, and between upper and

lower microwave entrance

206a and 206b, makes wave guide box 205 send standing wave very glibly.Be used for guiding the wave guide box 205 of the microwave that sends by magnetron 207 to be installed in the outside of chamber 201, envelope upper and

lower microwave entrance

206a, 206b and cover plate 209, magnetron 207 is installed in the outside of wave guide box 205 back sides one wall, and it has the antenna 208 of the outstanding magnetron that puts in wave guide box.When with microwave cooked food, the microwave that magnetron 207 sends is radiated on the food in the chamber 201 by upper and lower two microwave entrance 206a and 206b.Yet, thisly two enter the type microwave oven its shortcoming is also arranged, because its wave guide box 205 becomes longer, separable cover plate 209 must be attached to the outside of chamber 201 so that produce standing wave in the wave guide box 205, material cost and manufacturing cost increase like this.In addition,, just standing wave can not be produced fully in the wave guide box, thereby the thermal output and the even heating properties of microwave oven may be reduced owing between a side of the antenna 208 of magnetron 207 and wave guide box 205, do not form the short circuit face.

Fig. 5, Fig. 6 represent that respectively European patent discloses the 0478053rd pair of longitudinal section and schematic perspective view that enters the type microwave oven.This microwave oven comprises a vertically extending wave guide box 305, one sidewall of it and chamber 301 is connected as a single entity, and a ledge 304 that constitutes in its outer wall the first half is arranged, offer upper and lower microwave entrance 306a and 306b on this wave guide box 305, with chamber 301 internal communication; The magnetron 307 that also comprises a band antenna 308 is installed on the ledge 304 of wave guide box 305, and antenna 308 constitutes a short circuit face to be inserted into to make in the ledge 304 with keeping at a certain distance away betwixt.The width of the ledge 304 of wave guide box 305 is chosen as the length that is substantially equal to antenna 308, and wave guide box 305 has a horizontal top wall face 305a and an inclined lower wall face 305b.In addition, the distance between upper and lower microwave entrance 306a and the 306b is elected as big as far as possible, so that upper and lower microwave entrance is respectively near the upper/lower terminal setting of wave guide box 305.According to said structure, open microwave oven, the microwave that sends and inject by antenna 308 by magnetron 307, the ledge 304 of waveguide short circuit face by the band antenna, produce standing wave in wave guide box 305, then, a part is directly injected chamber 301 by the last microwave entrance 306a of wave guide box, remaining microwave is injected in the chamber 301 by following microwave entrance 306b after the inclined lower wall 305b of wave guide box reflection.The result forms interference region in chamber, the food in the chamber is evenly heated.But the microwave oven of this structure still has its shortcoming, because wave guide box 305 becomes longer, distance about making between microwave entrance 306a and the 306b is bigger, and ledge 304 need be arranged on the outer wall of wave guide box extraly, be used for producing standing wave to constitute the short circuit face at wave guide box, then the structure more complicated of wave guide box has increased manufacturing cost.Moreover long wave guide box brings difficulty for the installation electric components, because electric components is installed in the wave guide box lower portion usually.

For overcoming above-mentioned two defective that enters the type microwave oven, on March 2nd, 1994 disclosed 1083301A Chinese patent application (application number: 93106010.9) provide a kind of two type Wave guide systems that enter of microwave oven.

Fig. 7, Fig. 8 have represented to have an embodiment of the microwave oven of this Wave guide system, and Fig. 7 is the longitudinal section of this embodiment, and Fig. 8 is the A-A cutaway view of Fig. 7.It comprises a chamber 401 of placing cooking food, a pair of upper and lower microwave entrance 406a and 406b are arranged on the one sidewall, a magnetron 407 that has antenna 408, it is installed between two microwave entrances, and with the band microwave entrance alternate separating of sidewall, also comprise a wave guide box 405, be arranged on the sidewall of chamber 401, envelope microwave entrance 406a and 406b, and supporting magnetron 407, it has one and is parallel to antenna 408, and with antenna be separated by the horizontal top wall face 405a of small distance, just the short circuit face of present embodiment; An inclined lower wall face 405b.As shown in Figure 7, last microwave entrance 406a is provided with than the antenna 408 of the more close magnetron 407 of following microwave entrance 406b, and its aperture area is less than the area of following microwave entrance 406b.

Fig. 9, Figure 10 have represented to have another embodiment of this Wave guide system microwave oven, and Fig. 9 is the longitudinal section of this another embodiment, and Figure 10 is the B-B cutaway view of Fig. 9.This embodiment is basic identical with previous embodiment on general structure, and different is to go up the area of the area of microwave entrance 506a greater than following microwave entrance 506b, and wave guide box 505 also turns upside down with previous embodiment.

Thisly two enter the type microwave oven and obtained a much progress, but the uniformity coefficient of cooking food heating is still not very good, still needs invalidly some energy that consume more.

Above-mentioned shortcoming in view of microwave oven in the present technology, the purpose of this invention is to provide a kind of microwave oven with homogeneously heating wave guide box, it can improve heating properties, and the food in the microwave oven chamber can be heated more equably, improve the heat efficiency, and reach energy-conservation effect.

To achieve these goals, the present invention is improved to the wave guide box with three microwave entrances with the wave guide box that common double enters the type microwave oven, these three microwave entrances divide two area arrangements up and down, one of them zone is a horizontal rectangle entrance, area is big than other gross area of two inlets, another zone is two and substantially is combined into rectangular shaped by rectangular patterns and is the microwave entrance of symmetry with the diagonal in this zone that it was surrounded, this wave guide box has a horizontal wall surface and an inclined wall, and horizontal wall surface is the short circuit face, is parallel to magnetron antenna.

It is two symmetry inlets that described two zones can be arranged to microwave entrance, and following microwave entrance is a rectangle entrance, and the horizontal wall surface of wave guide box is positioned at roof, and inclined wall is positioned at lower wall; Also it can be turned upside down, being arranged to microwave entrance is rectangle entrance, and following microwave entrance is two symmetry inlets, and the horizontal wall surface of wave guide box is positioned at lower wall, and inclined wall is positioned at roof; Rectangle entrance can also be placed the roof of chamber, two symmetry inlets place the sidewall upper portion of chamber, and what wave guide box is had be used for being connected with chamber is The shell of shape cross section, this shell coats the microwave entrance that is positioned at chamber roof and sidewall upper portion, and its inclined wall is positioned at roof, and horizontal wall surface is positioned at lower wall.

Described microwave entrance all is covered with aperture in its zone, hole diameter can be at φ 0.5～5mm.

Described two symmetrical microwave entrances, the rectangular combinations of patterns shape that meets at right angles, each corner angle of rectangular patterns all fall into fillet, and are symmetry with the diagonal in this zone that it was surrounded; Also can be the shape of symmetry therewith.The rectangular shaped of the synthetic chamfering of rectangular pattern groups, a plurality of corner angle of rectangular patterns all fall into fillet, and are symmetry with the diagonal in this zone that it was surrounded; Also can be the shape of symmetry therewith.Be trapezoidal pattern and be combined into rectangular shaped, each corner angle of trapezoidal pattern all fall into fillet, and are symmetry with the diagonal in this zone that it was surrounded; Also can be the shape of symmetry therewith.The rectangular combinations of patterns shape that meets at right angles, each corner angle of rectangular patterns all meet at right angles, and are symmetry with the diagonal in this zone that it was surrounded; Also can be the shape of symmetry therewith.The rectangular shaped of the synthetic chamfering of rectangular pattern groups, each corner angle of rectangular patterns all meet at right angles or the obtuse angle, and are symmetry with the diagonal in this zone that it was surrounded; Also can be the shape of symmetry therewith.

Upper and lower microwave entrance is designed to different big or small purposes, is in order to make the microwaves by two inlets form the uniform electric field of density.Particularly when upper and lower two microwave entrances are arranged on the opposite end of wave guide box, because it is different to the distance of wave guide box opposite end from the antenna of magnetron, two microwave entrances must have inlet area inequality up and down, so that obtain to have the microwave electric field of uniform density, for this reason, to become than small size from the nearer entry design of magnetron antenna, and become than large tracts of land from antenna entry design far away, the present invention again will be from the nearer inlet than small size of antenna, be designed to two little inlets of symmetric arrangement, between two little inlets being can not be by the zone of microwave.

The present invention enters the type microwave oven and compares with two with the common type that singly enters, owing to will be designed to two little inlets of symmetric arrangement from the nearer microwave entrance of antenna than small size, make the microwave that enters chamber more even, form multiple interference region simultaneously in chamber, therefore the even heat food of energy obtains satisfied culinary art effect, need not prolong cooking time, but energy savings, according to the culinary art result of the test to julienne potatoes, the heat efficiency can improve 20%; Moreover wave guide box of the present invention has shortened length, makes it to install at an easy rate below wave guide box electronic devices and components.

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Fig. 1 is the perspective diagram that singly enters the type microwave oven in the prior art;

Fig. 2 is the longitudinal section of Fig. 1;

Fig. 3 is No. 5057660 disclosed two longitudinal sections that enter the type microwave oven of United States Patent (USP) in the prior art;

Fig. 4 is the partial, exploded perspective view of Fig. 3;

Fig. 5 is No. 0478053 disclosed two longitudinal sections that enter the type microwave oven of European patent disclosure in the prior art;

Fig. 6 is the perspective diagram of Fig. 5;

Fig. 7 is two longitudinal sections that enter an embodiment of type microwave oven that the 1083301A Chinese patent application is provided;

Fig. 8 is the A-A cutaway view of Fig. 7;

Fig. 9 is two longitudinal sections that enter another embodiment of type microwave oven that the 1083301A Chinese patent application is provided;

Figure 10 is the B-B cutaway view of Fig. 9;

Figure 11 is the longitudinal section of first embodiment of the invention;

Figure 12 is the C-C cutaway view of Figure 11;

Figure 13 is the longitudinal section of second embodiment of the invention;

Figure 14 is the D-D cutaway view of Figure 13;

Figure 15 is the longitudinal section of third embodiment of the invention.

Shown in Figure 11-15, the present invention includes a chamber 1, a bottom that is installed in chamber 1, be used to hold the pallet 2 of cooking food, one is positioned at below the pallet 2 and with the electric rotating machine 3 of its driving, on chamber 1, offer three microwave entrance 6a, 6b and 6c, also comprise a wave guide box 5 that coats the shell of 6a, 6b and 6c together with the chamber wall body portion formation of offering these three microwave entrances, it couples together chamber 1 and the magnetron 7 that has antenna 8, and the microwave that magnetron 7 is sent imports chamber 1 by three microwave entrance 6a, 6b, 6c.

Wherein:

First embodiment is referring to Figure 11, Figure 12, and its microwave entrance is arranged on the chamber sidewall, and last microwave entrance is inlet 6a, the 6b of two symmetries, and following microwave entrance is a rectangle entrance 6c.Wave guide box 5 has a horizontal top wall 5a and an inclined lower wall 5b, and horizontal top wall 5a is the short circuit face, is parallel to antenna 8.

Second embodiment is referring to Figure 13, Figure 14, and its microwave entrance is arranged on the chamber sidewall, and two microwave entrances and first embodiment turn upside down, and last microwave entrance is a rectangle entrance 6c, inlet 6a, 6b that following microwave entrance is two symmetries.Wave guide box 5 has an inclination roof 5b and horizontal lower wall 5a, and horizontal lower wall 5a is the short circuit face, is parallel to antenna 8.

The 3rd embodiment is referring to Figure 15, and its last microwave entrance is arranged on the roof of chamber 1, is a rectangle entrance 6c, and following microwave entrance is arranged in the sidewall upper portion of chamber 1, is inlet 6a, the 6b of two symmetries, and wave guide box 5 has and is used for and being that chamber 1 is connected

The shell of shape cross section, band inclination roof 5b and horizontal lower wall 5a, and horizontal lower wall 5a is the short circuit face, is parallel to antenna 8, magnetron 7 is installed in the back wall outside by the wave guide box 5 of chamber sidewall.

Under the situation of not violating claim institute's restricted portion of the present utility model and principle, various conversion and improvement can also be arranged, such conversion and improvement all should drop within the protection range of the present utility model.

Claims

1, a kind of microwave oven with homogeneously heating wave guide box, comprise chamber, pallet, electric rotating machine, wave guide box, magnetron, high-tension transformer, high-voltage capacitor, cooling fan, fire door and guidance panel, the bottom of chamber is provided with a pallet between two parties, pallet lower device electric rotating machine, magnetron, high-tension transformer, high-voltage capacitor, cooling fan all is installed in the electric chamber adjacent with chamber, guidance panel and fire door are installed in the front of microwave oven, be used for the indoor wave guide box of microwave introduction chamber of magnetron emission is coupled together chamber and magnetron, offer microwave entrance on this wave guide box and the wall that chamber links to each other, it is characterized in that described wave guide box has three microwave entrances, divide two area arrangements up and down, one of them zone is a horizontal rectangle entrance, area is big than other gross area of two inlets, and another zone is two and is combined into rectangular shaped by rectangular patterns substantially, and the diagonal with this zone that it was surrounded is the microwave entrance of symmetry; Described wave guide box has a horizontal wall surface and an inclined wall, and horizontal wall surface is the short circuit face, is parallel to magnetron antenna.

2, microwave oven according to claim 1 is characterized in that the microwave entrance zone is two symmetry inlets, and following microwave entrance zone is a rectangle entrance, and the horizontal wall surface of wave guide box is positioned at roof, and inclined wall is positioned at lower wall.

3, microwave oven according to claim 1 is characterized in that the microwave entrance zone is rectangle entrance, and following microwave entrance zone is two symmetry inlets, and the horizontal wall surface of wave guide box is positioned at lower wall, and inclined wall is positioned at roof.

4, microwave oven according to claim 1 is characterized in that rectangle entrance is positioned at the roof of chamber, and two symmetry inlets are positioned at the sidewall upper portion of chamber, and wave guide box has being of being used for being connected with chamber The shell of shape cross section, this shell exceeds with the microwave entrance that coating is positioned at chamber roof and sidewall upper portion, and its inclined wall is positioned at roof, and horizontal wall surface is positioned at lower wall.

5,, it is characterized in that all being covered with in all microwave entrances aperture according to claim 1,2,3 or 4 described microwave ovens.

6, according to claim 1,2,3 or 4 described microwave ovens, it is characterized in that on the wave guide box the rectangular combinations of patterns of the two symmetrical microwave entrances shape that meets at right angles, each corner angle of rectangular patterns all fall into fillet, and are symmetry with the diagonal in this zone that it was surrounded.

7,, it is characterized in that the shape and the described shape symmetry of claim 6 of two symmetrical microwave entrances on the wave guide box according to claim 1,2,3 or 4 described microwave ovens.

8, according to claim 1,2,3 or 4 described microwave ovens, the rectangular shaped that it is characterized in that the synthetic chamfering of the rectangular pattern groups of two symmetrical microwave entrances on the wave guide box, each corner angle of rectangular patterns all fall into fillet, and are symmetry with the diagonal in this zone that it was surrounded.

9,, it is characterized in that the shape and the described shape symmetry of claim 8 of two symmetrical microwave entrances on the wave guide box according to claim 1,2,3 or 4 described microwave ovens.

10, according to claim 1,2,3 or 4 described microwave ovens, it is characterized in that two symmetrical microwave entrances are trapezoidal pattern on the wave guide box is combined into rectangular shaped, each corner angle of trapezoidal pattern all fall into fillet, and are symmetry with the diagonal in this zone that it was surrounded.

11,, it is characterized in that the shape and the described shape symmetry of claim 10 of two symmetrical microwave entrances on the wave guide box according to claim 1,2,3 or 4 described microwave ovens.

12, according to claim 1,2,3 or 4 described microwave ovens, it is characterized in that on the wave guide box the rectangular combinations of patterns of the two symmetrical microwave entrances shape that meets at right angles, each corner angle of rectangular patterns all meet at right angles, and are symmetry with the diagonal in this zone that it was surrounded.

13,, it is characterized in that the shape and the described shape symmetry of claim 12 of two symmetrical microwave entrances on the wave guide box according to claim 1,2,3 or 4 described microwave ovens.

14, according to claim 1,2,3 or 4 described microwave ovens, the rectangular shaped that it is characterized in that the synthetic chamfering of the rectangular pattern groups of two symmetrical microwave entrances on the wave guide box, each corner angle of rectangular patterns all meet at right angles or the obtuse angle, and are symmetry with the diagonal in this zone that it was surrounded.

15,, it is characterized in that the shape and the described shape symmetry of claim 14 of two symmetrical microwave entrances on the wave guide box according to claim 1,2,3 or 4 described microwave ovens.