CN1485574A - Micro-wave oven - Google Patents
Micro-wave oven Download PDFInfo
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- CN1485574A CN1485574A CNA031541682A CN03154168A CN1485574A CN 1485574 A CN1485574 A CN 1485574A CN A031541682 A CNA031541682 A CN A031541682A CN 03154168 A CN03154168 A CN 03154168A CN 1485574 A CN1485574 A CN 1485574A
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- furnace chamber
- wave oven
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- mode stirrer
- microwave
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Abstract
The present invention provides a microwave oven comprising a magnetron, a furnace chamber, a waveguide for radiation of microwave generated by the magnetron into the furnace chamber, a storage disc arranged on the lower wall of the furnace chamber and a mode stirrer for improving microwave mode distribution. The oven by the invention can realize succession uniformly heating for the food and guarantee a high overall efficiency.
Description
Technical field
The present invention relates to a kind of micro-wave oven, especially relate to the microwave mode that under different loads, can dynamically improve in the furnace chamber, realize evenly heating continuously, and guarantee the micro-wave oven of overall efficiency food.
Background technology
In general, working as follows of known micro-wave oven: the magnetron in the micro-wave oven produces the electromagnetic wave of high frequency, i.e. so-called " microwave "; The microwave that produced enters the furnace chamber that is placed with food through waveguide, and in furnace chamber repeatedly toward interflection, constantly pass food and cause its molecular vibration, come cooking food thereby produce heat.
As shown in Figure 1, existing micro-wave oven all is arranged on waveguide mouth 1 on the sidewall or upper wall of furnace chamber, and microwave is by waveguide mouth microwave radiation in furnace chamber.Be installed in the tray (generally being made of glass) of furnace chamber lower wall center simultaneously, i.e. glass rotating disk 2 not stalls are moving, make the food that is contained on the glass rotating disk 2 rotate thermally equivalent.The efficient of food heating and uniformity coefficient are by the distribution pattern decision of microwave energy in furnace chamber.Micro-wave oven adopts rectangular cavity, and it is a kind of multimode cavity, has a plurality of patterns to exist simultaneously.The design micro-wave oven mainly is exactly a length size of selecting furnace chamber, and the resonance of its various patterns is all dropped within operating frequency (centre frequency the is 2450MHz) scope of magnetron frequently.
The pattern of micro-wave oven can change along with the variation of furnace chamber internal burden (as Foods or drinks) quantity, that is to say that the quantity of heat food changes, and the furnace chamber internal schema also can change.At this moment, some is evenly distributed with sharp pattern to microwave and may be only occurs when the low load, does not occur when high capacity or the less important pattern of weakened one-tenth transmission energy; Simultaneously some may take place when the high capacity the disadvantageous pattern of even heating, TE11X pattern for example, can cause the center of glass rotating disk 2 of furnace chamber center near microwave strong excessively, localized hyperthermia appears.Like this, even glass rotating disk 2 does not stop rotation, the heating of food remains uneven.
US Patent specification US-4144436 discloses so-called mode stirrer method, i.e. the rotation of the agitator by a kind of symmetrical structure comes dispersion microwave, makes the equally distributed purpose of microwave and reach.But this agitator is placed on outside the micro-wave oven furnace chamber, and microwave comes out the back earlier through this external agitator from the waveguide mouth, just is coupled into furnace chamber by 4 coupling apertures then.In this process, microwave is loss to some extent inevitably, makes overall efficiency reduce.And the GB standard of China comes from the EN standard in Europe, and its overall efficiency for micro-wave oven has strict demand.So can't use this external mode stirrer.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of micro-wave oven, can dynamically improve the microwave mode in the furnace chamber under different loads, thereby make the heating of food more even, but guarantee that simultaneously overall efficiency is higher.The another one purpose is exactly that automatic protection functions is provided when micro-wave oven is unloaded.
For solving the problems of the technologies described above, basic technical scheme of the present invention is: the tray of micro-wave oven is fixing not to be rotated, and the mode stirrer that installation is rotated by motor-driven on the furnace chamber inwall, rotation by built-in mode stirrer periodically changes the mode profile in the furnace chamber, produce scattering and cause new mode producing, make the equally distributed purpose of microwave and reach.On the other hand, the microwave that magnetron produces directly enters furnace chamber after waveguide, and the effect of receptive pattern agitator in furnace chamber no longer includes the loss problem of external agitator, has improved the efficient of complete machine.
Described tray is by devitrified glass, and perhaps ceramic, perhaps Pyrex constitute, because microwave energy well penetrates these materials.Because the furnace chamber of micro-wave oven is a cuboid, tray is preferably square, to hold maximum food.Tray is with silica stationary and edge sealing, to prevent that steam enters the bottom in the heating process.
Waveguide openings is positioned at the right wall of furnace chamber, and mode stirrer and waveguide on the same wall face of furnace chamber, can not be placed on lower wall, be positioned at tray below, also can be on sidewall or upper wall.Mode stirrer is by pottery, perhaps plastics, and perhaps the metal material of low permeability (for example aluminium) constitutes, and can effectively change the pattern of furnace chamber microwave like this, can not absorb the energy of microwave again and causes loss.Fluting and microwave oscillator structure are arranged on the mode stirrer, and the length of this fluting is about 1/4th of microwave (centre frequency is 2450MHz) resonance wavelength.Mode stirrer and mode stirrer axle are connected by riveted joint or screw, and the mode stirrer axle is inserted in the jack on the furnace chamber wall.There is restriction protrusion to come space between fill pattern agitator and the tray on the mode stirrer.
Temperature sensor is equipped with in the furnace chamber lower wall outside, and control disconnected microwave oven supply power when this sensor sharply rose in the unloaded temperature of cavity.
Furnace chamber is a cuboid, has six walls, and wherein three are equipped with waveguide mouth, mode stirrer and door body respectively, and other three is idle wall, and sphere and wavy stretching can be set thereon, with more uniform scattering microwave.
Description of drawings
Describe preferred embodiment particularly by the reference accompanying drawing, above-mentioned purpose of the present invention and advantage will be clearer, wherein:
Fig. 1 is the perspective view of prior art micro-wave oven furnace chamber.
Fig. 2 is the perspective view of micro-wave oven furnace chamber according to an embodiment of the invention.
Fig. 3 is the perspective view when taking apart according to the mode stirrer of micro-wave oven embodiment illustrated in fig. 2.
Fig. 4 is the cutaway view according to the mode stirrer of micro-wave oven embodiment illustrated in fig. 2.
Fig. 5 is the scheme of installation according to the temperature sensor of micro-wave oven embodiment illustrated in fig. 2.
Fig. 6 is the schematic diagram that stretches on the idle wall of micro-wave oven according to another embodiment of the present invention.
The specific embodiment
Below with reference to accompanying drawing, describe the preferred embodiments of the present invention in detail.
Fig. 2 is the perspective view of the micro-wave oven furnace chamber of one embodiment of the invention.The tray 4 of micro-wave oven is non-rotary dull and stereotyped devitrified glass, and with silica gel 5 sealing and fixing on the furnace chamber lower wall.Different with the circular tray in the general micro-wave oven, tray 4 is square, and this is rectangular-shaped because of micro-wave oven, and square tray can be than the more food of holding of circle.Waveguide mouth 3 is positioned at the right wall of furnace chamber.
The mode stirrer 6 that is made of metallic aluminium is installed in the below of tray 4, and Fig. 3 is the perspective view under its disassembled state, and Fig. 4 is its cutaway view.Have a groove on the furnace chamber lower wall, there is an axle jack 9 the groove center.Mode stirrer axle 7 just is inserted in the jack 9 and locatees, and axle jack 9 also has the effect of guiding, and is vertical with the center line of guaranteeing axle.Mode stirrer 6 and mode stirrer axle 7 connect as one by riveted joint or screw, are positioned at the center of above-mentioned groove by axle jack 9.Drive motors installing plate 15 is arranged on the outer bottom of micro-wave oven, and drive motors 14 is mounted thereon.The axle of drive motors 14 passes a jack 9 and drives 7 rotations of mode stirrer axle.
After mode stirrer 6 installs, place tray 4 thereon.Fill by the restriction protrusion on the mode stirrer 68 in gap between the glass face of the metal covering of mode stirrer 6 and tray 4, less to guarantee the free gap of mode stirrer about in the of 6, makes things convenient for the stable rotation of mode stirrer 6.
After tray 4 places,,, influence the rotation of mode stirrer 6 to prevent that steam enters the bottom in the heating process with silica gel 5 edge sealing.In addition, should make the flange 10 of a location on the header board of micro-wave oven furnace chamber, the thickness of its height and tray 4 is approaching.
Fluting and microwave oscillator structure are arranged on the mode stirrer 6, and the length of this fluting is about 1/4th of microwave (centre frequency is 2450MHz) resonance wavelength.
For preventing to damage furnace chamber or microwave system under the micro-wave oven Light Condition, the temperature sensor 16 of plane temperature-sensitive is installed in the furnace chamber lower wall outside by temperature sensor bracket 17, as shown in Figure 4 and Figure 5.This sensor utilizes temperature rise variation characteristics greatly under the Light Condition, can control to disconnect microwave oven supply power when cavity temperature sharply rises, thereby realize no-load protection.
Furnace chamber is a cuboid, has six walls, and wherein waveguide 3 is at You Bi, and mode stirrer 6 is at lower wall, and the door body is at antetheca, and three walls in addition are idle walls.For more uniform scattering microwave, as shown in Figure 6 wavy stretching 18-1 and spherical stretching 18-2 are set on these three idle walls.
In other embodiments, mode stirrer 6 may be on the lower wall of furnace chamber, and just can be provided with spherical stretching 18-2 on the lower wall this moment, but should consider the placement of temperature sensor 16, for example arranges in mode as shown in Figure 6.
Claims (11)
1. micro-wave oven, the microwave that comprises magnetron, furnace chamber, magnetron is produced is radiated waveguide in the furnace chamber, is installed in the tray on the furnace chamber lower wall and is used to improve the mode stirrer that microwave mode distributes, the opening of described waveguide is positioned at the right wall of furnace chamber, it is characterized in that, described tray is fixing not to be rotated, described mode stirrer is installed on the furnace chamber inwall and can rotates, and this mode stirrer and described waveguide be not on the same wall of furnace chamber.
2. according to the described micro-wave oven of claim 1, it is characterized in that described tray is by devitrified glass, perhaps ceramic, perhaps Pyrex constitute.
3. according to the described micro-wave oven of claim 2, it is characterized in that described tray is square.
4. according to the described micro-wave oven of claim 2, it is characterized in that described tray is with silica stationary and edge sealing.
5. according to the described micro-wave oven of claim 1, it is characterized in that described mode stirrer is by pottery, perhaps plastics, perhaps the metal material of low permeability constitutes.
6. according to the described micro-wave oven of claim 5, it is characterized in that described mode stirrer has fluting and microwave oscillator structure, the length of this fluting is 1/4th of microwave wavelength.
7. according to the described micro-wave oven of claim 5, it is characterized in that, described mode stirrer has an axle, has an axle jack on the face of the Installation Modes agitator of described furnace chamber, this axle is connected by riveted joint or screw with described mode stirrer, and this mode stirrer axle inserts in the axle jack of furnace chamber.
8. according to the described micro-wave oven of claim 5, it is characterized in that described mode stirrer is rotated by motor-driven.
9. according to the described micro-wave oven of claim 5, it is characterized in that on the described mode stirrer restriction protrusion being arranged.
10. according to the described micro-wave oven of claim 1, it is characterized in that also comprising,
One temperature sensor is installed in outside the lower wall of described furnace chamber, and control disconnected microwave oven supply power when this temperature sensor sharply rose in the unloaded temperature of the cavity of furnace chamber.
11. according to the described micro-wave oven of claim 1, it is characterized in that, on three idle walls in described furnace chamber except that waveguide mouth, mode stirrer and door body place wall, sphere and wavy stretching be set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154168 CN1220847C (en) | 2003-08-15 | 2003-08-15 | Micro-wave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03154168 CN1220847C (en) | 2003-08-15 | 2003-08-15 | Micro-wave oven |
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| Publication Number | Publication Date |
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| CN1485574A true CN1485574A (en) | 2004-03-31 |
| CN1220847C CN1220847C (en) | 2005-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03154168 Expired - Fee Related CN1220847C (en) | 2003-08-15 | 2003-08-15 | Micro-wave oven |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586819B (en) * | 2009-06-18 | 2010-06-09 | 电子科技大学 | Microwave oven having metal sub-wavelength structure |
| CN102818301A (en) * | 2012-08-24 | 2012-12-12 | 美的集团有限公司 | Control method and device of microwave oven and microwave oven |
| CN108141932A (en) * | 2015-09-30 | 2018-06-08 | 康宁股份有限公司 | Microwave mode agitator means with microwave transmission region |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102635881A (en) * | 2012-03-27 | 2012-08-15 | 广东美的微波电器制造有限公司 | Microwave oven with a heat exchanger |
-
2003
- 2003-08-15 CN CN 03154168 patent/CN1220847C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586819B (en) * | 2009-06-18 | 2010-06-09 | 电子科技大学 | Microwave oven having metal sub-wavelength structure |
| CN102818301A (en) * | 2012-08-24 | 2012-12-12 | 美的集团有限公司 | Control method and device of microwave oven and microwave oven |
| CN102818301B (en) * | 2012-08-24 | 2015-03-11 | 美的集团股份有限公司 | Microwave oven control method and device, as well as microwave oven |
| CN108141932A (en) * | 2015-09-30 | 2018-06-08 | 康宁股份有限公司 | Microwave mode agitator means with microwave transmission region |
| US10993295B2 (en) | 2015-09-30 | 2021-04-27 | Corning Incorporated | Microwave mode stirrer apparatus with microwave-transmissive regions |
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| Publication number | Publication date |
|---|---|
| CN1220847C (en) | 2005-09-28 |
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