CN100455894C - Microwave oven - Google Patents
Microwave oven Download PDFInfo
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- CN100455894C CN100455894C CNB2004100535309A CN200410053530A CN100455894C CN 100455894 C CN100455894 C CN 100455894C CN B2004100535309 A CNB2004100535309 A CN B2004100535309A CN 200410053530 A CN200410053530 A CN 200410053530A CN 100455894 C CN100455894 C CN 100455894C
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- restraining device
- magnetron
- direct irradiation
- wave oven
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Abstract
The present invention aims at providing a comprehensive microwave oven with high heating efficiency and homogeneous heating. The microwave oven of the present invention is provided with a cavity body, a magnetron, a waveguide tube, a magnetron transmission antenna and a direct irradiation restraining device, wherein objects to be heated are placed in the cavity body; the magnetron generates high frequency waves and is arranged outside the cavity body; an inlet and an outlet of the waveguide tube are separately connected with the magnetron and the cavity body, and the waveguide tube is used for transmitting the high frequency waves to a waveguide tube of the cavity body; the magnetron transmission antenna is arranged in the waveguide tube and is used for transmitting the high frequency waves generated by the magnetron; the direct irradiation restraining device is arranged close to an outlet inside the waveguide tube or faces the inner wall of the cavity body of the outlet. The present invention is provided with the direct irradiation restraining device, so the present invention can scatter the high frequency waves transmitted by the magnetron antenna so as to restrain the high frequency waves from irradiating on the objects to be heated directly. Moreover, the present invention can also prevent the high frequency waves from reflecting to the waveguide tube. Therefore, the microwave oven of the present invention enables the high frequency waves to cover on the whole objects to be heated to carry out uniform heating and increase the heating efficiency.
Description
Technical field
The present invention relates to a kind of micro-wave oven.
Background technology
Fig. 5 is the schematic diagram of the general microwave oven of expression.As shown in Figure 5, this micro-wave oven possesses: the cavity 2 of placing heating object; Be arranged on outside the described cavity 2 and the magnetron 3 of generation high frequency waves; The waveguide 4 that inlet, outlet are connected with described magnetron 3, described cavity 2 respectively; It is inner and be used to launch the magnetron transmitting antenna 5 of the high frequency waves that described magnetron 3 produces to be arranged at waveguide 4.
In the past, general in order to improve the efficiency of heating surface of micro-wave oven, for example Japanese patent laid-open 5-121158 number, spy open flat 5-266976 number, the spy opens in the flat 10-106741 communique is to adopt high frequency waves are shone directly into the mode that heats on the heating object, perhaps, further, as described in Japanese patent laid-open 5-121158 number, in order to improve the efficiency of heating surface, setting can be carried out the coupling adjustment means of impedance matching according to heating object.
Yet, in above-mentioned structure in the past, because the high frequency waves that the magnetron of micro-wave oven produces shine directly on the heating object, therefore, be difficult to effectively heat for low-density such as quick-fried corn, underloaded heating object, and, there is the uneven problem of heating.And, if the regulating measure of coupling adjustment means etc. is set, then cause microwave oven complexity, cost to raise inevitably.
Summary of the invention
The present invention in view of the above problems, its purpose is to provide a kind of homogeneous heating, comprehensively and the high micro-wave oven of the efficiency of heating surface.
The micro-wave oven of the present invention the 1st aspect possesses: the cavity of placing heating object; Be arranged on outside the described cavity and produce the magnetron of high frequency waves; Inlet, outlet are connected and are used for high frequency waves are delivered to the waveguide of described cavity respectively with described magnetron, described cavity; It is inner and be used to launch the magnetron transmitting antenna of the high frequency waves that described magnetron produces to be arranged at waveguide, it is characterized in that, also possess the direct irradiation restraining device, described direct irradiation restraining device be arranged near the outlet in the described waveguide or the inwall in the face of the described cavity of described outlet on.
Owing to be provided with this direct irradiation restraining device near the outlet in described waveguide or on the inwall in the face of the described cavity of described outlet, can make the high frequency waves generation scattering that emits from magnetron antenna, can suppress high frequency waves and shine directly on the heating object, make homogeneous heating.Simultaneously, when high frequency waves entered into cavity through this direct irradiation restraining device emission, if under the little situation of the density of heating object, this direct irradiation restraining device can prevent high frequency waves reflection echo conduit, promptly can improve the efficiency of heating surface.Therefore, this direct irradiation restraining device can make high frequency waves evenly cover whole heating object comprehensively and improve the efficiency of heating surface.
Moreover, in above-mentioned micro-wave oven, further also possessing projection, described projection is arranged in the waveguide, and is arranged on the same side with respect to described magnetron transmitting antenna and described direct irradiation restraining device.Like this, utilize this projection can prevent the high frequency waves reflected back magnetron of launching from magnetron antenna, can further improve and add thermal effect, effectively prevent the situation of the power falling of micro-wave oven after carrying out a period of time heating.
Moreover in above-mentioned micro-wave oven, described direct irradiation restraining device is plates, for making the trapezoidal or erose plates of rectangle of fillet, is preferably semicircular plates further.Because described direct irradiation restraining device is made above-mentioned shape, and, can effectively increase the girth in waveguide exit, the high frequency waves that make the magnetron transmission antennas transmit come out can be transmitted in the cavity fully.And, the direct irradiation restraining device is being made under the situation of semicircular plates, on manufacturing process, be easy to realize, can not increase production cost.
Moreover, in above-mentioned micro-wave oven, described projection can for the corresponding shape of the shape of described direct irradiation restraining device, when described direct irradiation restraining device was semicircular plates, described projection was preferably hemispherical projections.And, best, the center line separately of described magnetron transmitting antenna, described direct irradiation restraining device and described projection is positioned at same plane.Like this, make described projection and described direct irradiation restraining device corresponding or be in the same plane in shape, described projection and described direct irradiation restraining device can combine better, and performance suppresses the effect that high frequency waves shine directly into heating object and prevent high frequency waves reflection echo conduit or magnetron.
Moreover the distance between the center line of best described direct irradiation restraining device and the center line of projection is at 15～23mm.Can further improve the efficiency of heating surface like this.
Description of drawings
Fig. 1 (a), Fig. 1 (b) are the microwave oven structure schematic diagrames of the expression embodiment of the invention 1.
Fig. 2 is the microwave oven structure schematic diagram of the expression embodiment of the invention 2.
Fig. 3 is the curve map of the power output of expression micro-wave oven of the embodiment of the invention 1,2 and micro-wave oven in the past.
Fig. 4 (a) and (b), (c) are the micro-wave oven primary structure schematic diagrames partly of the conversion example of the expression embodiment of the invention.
Fig. 5 is the microwave oven structure schematic diagram of representing in the past.
The specific embodiment
1～4 pair of each example of the present invention elaborates with reference to the accompanying drawings.
Example 1
At first, describe for the micro-wave oven of the embodiment of the invention 1 with reference to Fig. 1 (a), Fig. 1 (b).Fig. 1 (a) is the schematic diagram of microwave oven structure of the expression embodiment of the invention 1, and Fig. 1 (b) is the schematic diagram of observing to inwall 2 ' side direction in the cavity 2 from Fig. 1 (a).The micro-wave oven of the embodiment of the invention 1 is to have increased direct irradiation restraining device 6 on microwave oven structure in the past as shown in Figure 5.Therefore, in this Fig. 1 for the identical structure division of micro-wave oven in the past, give identical symbol.Shown in Fig. 1 (a), the micro-wave oven of the embodiment of the invention 1 possesses: the cavity 2 of placing heating object; Be arranged on outside the described cavity 2 and the magnetron 3 of generation high frequency waves; Inlet (not shown), outlet 1 waveguide 4 that is connected with described magnetron 3, described cavity 2 respectively; Be arranged at the inside of waveguide 4 and be used to launch the magnetron transmitting antenna 5 of the high frequency waves that described magnetron 3 produces; And direct irradiation restraining device 6, this direct irradiation restraining device 6 is arranged near the outlet 1 in the described waveguide 4 or is arranged on the inwall 2 ' in the face of the described cavity 2 of described outlet 1.
In the present embodiment, shown in Fig. 1 (b), be that this direct irradiation restraining device 6 is made semicircular plates.Thus, can increase the girth in waveguide 4 exits, the high frequency waves that make magnetron transmitting antenna 5 emit can be transmitted in the cavity 2 fully.And, can make the high frequency waves generation scattering that emits from magnetron antenna 5 owing to be provided with this direct irradiation restraining device 6, shine directly on the heating object to suppress high frequency waves.Simultaneously, when high frequency waves entered into cavity 2 through these direct irradiation restraining device 6 emissions, if under the little situation of the density of heating object, this direct irradiation restraining device 6 can also prevent high frequency waves reflection echo conduit 4.Therefore, this direct irradiation restraining device 6 can make high frequency waves cover whole heating object all sidedly evenly to heat and to improve the efficiency of heating surface.
In the present embodiment, this direct irradiation restraining device 6 is semicircular plates.In manufacturing process, can be by blank-forming to form direct irradiation restraining device 6 and cavity 2 as a whole.As seen, simple on its manufacturing process, be easy to realize, so can not increase the production cost of micro-wave oven, more do not need as prior art Japanese kokai publication hei 5-121158, to set up the coupling adjustment means that improve the efficiency of heating surface.
Below, utilize high frequency output method (IEC method) to test its power output for the micro-wave oven of present embodiment 1 and the micro-wave oven of prior art.In this test, rated power be P=1100W, rated voltage be V=120V～, rated frequency is F=60Hz, heat time heating time T=4187 * 10/ rated power=38.06S, safety standard is B-S125.Wherein, mark 1#, 2#, 3# represent the micro-wave oven that structure is identical, but have the inevitable deviation of bringing because of the accuracy of manufacture between them.Table 1 expression is to the result of the test of the micro-wave oven of present embodiment 1, and table 2 is represented the result of the test to the micro-wave oven of the prior art that does not possess direct irradiation restraining device 6.
Table 1
Table 2
The result of the test of more above-mentioned table 1 and table 2, the micro-wave oven that can find present embodiment 1 can improve about 40W～60W than the micro-wave oven power output of prior art.
Further, the micro-wave oven of present embodiment 1 and the micro-wave oven of prior art are carried out quick-fried corn test.In this test, heating object (load) is a corn, and weight is 3.50 ounces (being equivalent to 99 grams), experimental condition: by " quick-fried corn " key, and by " beginning " key, 5 heating continuously.Wherein, mark 1#, 2#, 3# represent the micro-wave oven that structure is identical, but have the inevitable deviation of bringing because of the accuracy of manufacture between them.Table 3 expression is to the result of the test of the micro-wave oven of present embodiment 1, and table 4 is represented the result of the test to the micro-wave oven of the prior art that does not possess direct irradiation restraining device 6.
Table 3
Table 4
The result of the test of more above-mentioned table 3 and table 4, in above-mentioned test, the micro-wave oven that can find present embodiment 1 lacks a lot than the corn quantity that the micro-wave oven of prior art does not pop.By above-mentioned quick-fried corn test, the effect that the micro-wave oven that can further confirm the embodiment of the invention 1 has can be evenly, heat heating object all sidedly, especially, for the such low-density of corn, underloaded heating object, effect is obvious especially.
At first, with reference to Fig. 2, Fig. 3 describes for the micro-wave oven of the embodiment of the invention 2.Fig. 2 is the microwave oven structure schematic diagram of the expression embodiment of the invention 2.Fig. 3 is the curve map schematic diagram of power output of the micro-wave oven of the expression embodiment of the invention 1,2 and prior art.
In Fig. 3, the coordinate transverse axis of this curve map is represented the time, the coordinate longitudinal axis is represented power output, wherein, in this curve map, solid line is represented the power output of prior art micro-wave oven, and chain-dotted line is represented the power output of the micro-wave oven of the embodiment of the invention 1, and dotted line is represented the power output of the micro-wave oven of the embodiment of the invention 2.As shown in Figure 3, at the initial stage of the micro-wave oven of the embodiment of the invention 1 when micro-wave oven is started working, power has obtained to increase substantially with respect to the micro-wave oven of prior art really, yet, also can omit falling to some extent at power after heating after a while.
Therefore, add thermal effect, to improve the problem that power slightly falls after rise after a period of time in order further to improve.As shown in Figure 2, the embodiment of the invention 2 is to have increased projection 7 on the microwave oven structure shown in Fig. 1 (a), Fig. 1 (b).Here, in Fig. 2,, give identical symbol for the structure division identical with the micro-wave oven of embodiment 1.
Shown in Figure 2, this projection 7 is arranged in the waveguide 4, and, be positioned at the same side with respect to the position and the described direct irradiation restraining device 6 of described magnetron transmitting antenna 5.
Utilize this projection 7 can make high frequency waves generation scattering, launch back in the cavity to maximum, heating object is heated evenly, simultaneously, can with direct irradiation restraining device 6 combine performance higher add thermal effect.
Each curve more shown in Figure 3 can find, the initial stage power when not only starting working with the power output of the micro-wave oven of the represented present embodiment 2 of dotted line increases substantially with respect to the micro-wave oven of prior art but also also can not fall after rise at power after heating after a while.
Here, best, the shape of projection 7 with the cross section of the plane parallel of direct irradiation restraining device 6 made and the corresponding shape of the shape of direct irradiation restraining device 6.Owing to the semicircular plates that are shaped as of the direct irradiation restraining device 6 in embodiment 1, therefore, in present embodiment 2, be that projection 7 is made its corresponding hemispheric projection.
Below, utilize high frequency output method (IEC method) to test its power output in the same manner for the micro-wave oven of present embodiment 2 and the foregoing description 1.In this test, the employing experimental condition identical with the foregoing description 1, promptly rated power be P=1100W, rated voltage be V=120V～, rated frequency is F=60Hz, heat time heating time T=4187 * 10/ rated power=38.06S, safety standard is B-S125.Table 5 expression hereinafter is to the result of the test of the micro-wave oven of present embodiment 2.
Table 5
The result of the test of comparison sheet 5 and table 1, table 2, the micro-wave oven that can find present embodiment 2 can improve about 50W～80W than the micro-wave oven power output of prior art, further can improve about 10～20W again than the micro-wave oven of embodiment 1.
Further, the micro-wave oven to present embodiment 2 carries out quick-fried corn test.In this test, identical in each experimental condition and the foregoing description 1, that is, heating object (load) is a corn, weight is 3.50 ounces (being equivalent to 99 grams), experimental condition: by " quick-fried corn " key, by " beginning " key, 5 continuous heating.Following table 6 expression is to the result of the quick-fried corn test of the micro-wave oven of present embodiment 2.
Table 6
The result of the test of more above-mentioned table 6 and table 3, table 4, in above-mentioned test, little more a lot of for the micro-wave oven of present embodiment 2 than the corn quantity that the micro-wave oven of prior art does not pop, and further less slightly than the corn quantity that does not pop of the micro-wave oven of embodiment 1.
Because as seen, on the basis of the micro-wave oven of embodiment 1, increase projection 7 is set in waveguide 4 further, can further improve the power output of micro-wave oven and further evenly, all sidedly heating object is heated.
Other variation
On the basis of the foregoing description 1,2, can also further do all distortion for micro-wave oven of the present invention.
For example, in embodiment 1,2, be that direct irradiation restraining device 6 is made semicircular plates, in addition, can also make rectangle, square, trapezoidal, irregularly shaped etc., promptly, direct irradiation restraining device 6 can be made rectangle, the trapezoidal or irregularly shaped shape of doing behind the fillet, for example, to be expression make the schematic diagram that rectangle is made the shape behind the fillet with direct irradiation restraining device 6 to Fig. 4 (a).In the case, also can have following effects similarly, can increase the girth in waveguide 4 exits, prevent that microwave from shining directly on the heating object evenly to heat as above-mentioned embodiment 1, simultaneously, can prevent that microwave from turning back to waveguide 4 and improving the efficiency of heating surface from cavity 2.Rectangle, the trapezoidal or irregularly shaped reason of making fillet are,, then cause " spark phenomenon " easily and influence adds thermal effect, can make magnetron 3 impaired simultaneously if having wedge angle on the direct irradiation restraining device 6.
Moreover, in the foregoing description 2 be with projection 7 make with embodiment 1 in direct irradiation restraining device 6 corresponding hemisphericals.Similarly, projection 7 also can make other shape corresponding to direct irradiation restraining device 6, and is not limited only to hemispherical.
Moreover, in order to make direct irradiation restraining device 6, projection 7 can combine more effectively the effect of performance " suppressing high frequency waves shines directly into heating object and prevent high frequency waves reflected back magnetron ", can shown in Fig. 4 (b), Fig. 4 (c), make the center line separately of direct irradiation restraining device 6, projection 7, magnetron transmitting antenna 5 in same plane.On this basis, the present inventor utilizes " quick-fried corn test " in the foregoing description 1,2, between the center line of direct irradiation restraining device 6 and projection 7 distance L further done research, its result is as shown in table 7.
Table 7
According to table 7, with reference to above-mentioned table 3,4,6, can find that the distance L between the center line of the center line of direct irradiation restraining device 6 and projection 7 can obtain the good thermal effect that adds between 15～23mm simultaneously.
Though described some embodiments of the present invention with reference to the accompanying drawings, they only are illustrative.In fact, under the condition that does not deviate from principle of the present invention, can also carry out various forms of modifications to it.In addition, scope of the present invention is limited by appended claims.
Claims (8)
1. a micro-wave oven possesses: the cavity (2) of placing heating object; Be arranged on outside the described cavity (2) and produce the magnetron (3) of high frequency waves; Inlet, outlet (1) are connected and are used for high frequency waves are delivered to the waveguide (4) of described cavity (2) respectively with described magnetron (3), described cavity (2); Be arranged at the inside of waveguide (4) and be used to launch the magnetron transmitting antenna (5) of the high frequency waves that described magnetron (3) produces, it is characterized in that,
Also possess direct irradiation restraining device (6),
Described direct irradiation restraining device (6) be arranged near the outlet (1) in the described waveguide (4) or the inwall (2 ') in the face of the described cavity (2) of described outlet (1) on,
Described direct irradiation restraining device (6) is plates.
2. micro-wave oven as claimed in claim 1 is characterized in that,
Also possess projection (7),
Described projection (7) is arranged in the waveguide (4), and is arranged on the same side with respect to described magnetron transmitting antenna (5) and described direct irradiation restraining device (6).
3. micro-wave oven as claimed in claim 2 is characterized in that,
The shape of described projection (7) is corresponding with the shape of described direct irradiation restraining device (6).
4. micro-wave oven as claimed in claim 1 is characterized in that,
Described direct irradiation restraining device (6) is semicircular plates.
5. micro-wave oven as claimed in claim 1 is characterized in that,
Described direct irradiation restraining device (6) is for making the trapezoidal or erose plates of rectangle that fillet is handled.
6. micro-wave oven as claimed in claim 2 is characterized in that,
Described projection (7) is hemispheric projection.
7. micro-wave oven as claimed in claim 2 is characterized in that,
The center line separately of described magnetron transmitting antenna (5), described direct irradiation restraining device (6) and described projection (7) is positioned at same plane.
8. micro-wave oven as claimed in claim 7 is characterized in that,
Distance is 15～23mm between the center line of the center line of described direct irradiation restraining device (6) and projection (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100535309A CN100455894C (en) | 2004-08-06 | 2004-08-06 | Microwave oven |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100535309A CN100455894C (en) | 2004-08-06 | 2004-08-06 | Microwave oven |
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| CN1731023A CN1731023A (en) | 2006-02-08 |
| CN100455894C true CN100455894C (en) | 2009-01-28 |
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| CNB2004100535309A Expired - Fee Related CN100455894C (en) | 2004-08-06 | 2004-08-06 | Microwave oven |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501246C (en) * | 2007-04-20 | 2009-06-17 | 美的集团有限公司 | Microwave oven for vehicle |
| CN102331005A (en) * | 2011-06-21 | 2012-01-25 | 太仓南极风能源设备有限公司 | Scattering head for waveguide tube of microwave oven |
| CN105222180B (en) * | 2015-10-28 | 2017-08-25 | 广东美的厨房电器制造有限公司 | A kind of micro-wave oven, rectangular waveguide and its determination method |
| CN106524243A (en) * | 2016-11-09 | 2017-03-22 | 广东美的厨房电器制造有限公司 | Microwave oven |
| WO2023206515A1 (en) * | 2022-04-29 | 2023-11-02 | 深圳麦时科技有限公司 | Microwave resonance heating system, electronic atomization apparatus, and assembly of objects to be heated |
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|---|---|---|---|---|
| CN1094804A (en) * | 1992-10-28 | 1994-11-09 | 船井电机株式会社 | Micro-wave oven |
| GB2313760A (en) * | 1996-05-31 | 1997-12-03 | Daewoo Electronics Co Ltd | Microwave oven with inwardly projecting waveguide |
| JP2000048947A (en) * | 1998-07-30 | 2000-02-18 | Sharp Corp | Microwave oven |
| CN1262413A (en) * | 1999-01-26 | 2000-08-09 | 三星电子株式会社 | Microwave oven |
| CN1264013A (en) * | 1999-02-19 | 2000-08-23 | 三洋电机株式会社 | High-frequency heating apparatus |
| JP2000346369A (en) * | 1999-06-03 | 2000-12-15 | Hitachi Hometec Ltd | High-frequency heating equipment |
| US20010002670A1 (en) * | 1999-12-07 | 2001-06-07 | Yoshiharu Omori | Microwave oven including antenna for properly propagating microwaves oscillated by magnetron |
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2004
- 2004-08-06 CN CNB2004100535309A patent/CN100455894C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1094804A (en) * | 1992-10-28 | 1994-11-09 | 船井电机株式会社 | Micro-wave oven |
| GB2313760A (en) * | 1996-05-31 | 1997-12-03 | Daewoo Electronics Co Ltd | Microwave oven with inwardly projecting waveguide |
| JP2000048947A (en) * | 1998-07-30 | 2000-02-18 | Sharp Corp | Microwave oven |
| CN1262413A (en) * | 1999-01-26 | 2000-08-09 | 三星电子株式会社 | Microwave oven |
| CN1264013A (en) * | 1999-02-19 | 2000-08-23 | 三洋电机株式会社 | High-frequency heating apparatus |
| JP2000346369A (en) * | 1999-06-03 | 2000-12-15 | Hitachi Hometec Ltd | High-frequency heating equipment |
| US20010002670A1 (en) * | 1999-12-07 | 2001-06-07 | Yoshiharu Omori | Microwave oven including antenna for properly propagating microwaves oscillated by magnetron |
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