CN1438822A - Choking structure of door of high-frequency heating device - Google Patents
Choking structure of door of high-frequency heating device Download PDFInfo
- Publication number
- CN1438822A CN1438822A CN03103818A CN03103818A CN1438822A CN 1438822 A CN1438822 A CN 1438822A CN 03103818 A CN03103818 A CN 03103818A CN 03103818 A CN03103818 A CN 03103818A CN 1438822 A CN1438822 A CN 1438822A
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- China
- Prior art keywords
- door
- choke
- mentioned
- choke structure
- electromagnetic wave
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
- H05B6/763—Microwave radiation seals for doors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electric Ovens (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
To provide a choke structure of a door for a high-frequency heating device which can suppress leakage electromagnetic wave outside in a simple structure. Of the choke structure 1 provided with a plurality of chokes 6, 7 divided by a plurality of slits on each side of a door 2 of the high-frequency heating device, a length L of each choke at the four corners of the door 2 is to be either 3/16 or more and 5/16 or less, or 7/32 or more and 9/32 or less, or 1/4 of a wavelength [lambda] of each frequency used.
Description
Technical field
The present invention relates to a kind of choke structure of door of thermatron.
Background technology
About the choke structure of the used door of the door leakage electromagnetic wave that prevents microwave oven, can enumerate " be used for microwave oven prevent electromagnetic wave leakage device " choke structure that is provided with the slit of (utilize periodic structure spare prevent electric wave from revealing) literary compositions such as (National Technical Report Vo 122.No2).The fine rule of Fig. 5 illustrates the spacing of the fabric width of choke longitudinally that the document gives and the relation between the leakage electromagnetic wave density, if by shown in Figure 5, then can reduce leakage electromagnetic wave density by shortening the longitudinal pitch in slit.
Hence one can see that, and for electromagnetic-wave leakage, preferably try one's best with the short spacing setting in the slit longitudinally.
Summary of the invention
Normally in above-mentioned used Gardenia stream coil structures, shorten the slit spacing and can reduce electromagnetic leakage, even yet actual conditions but are to shorten the slit spacing, also can not reduce the electromagnetic wave of four jiaos of opening parts of door and reveal, the fabric width that exists choke and the relation between the leakage electromagnetic wave density such as fail to understand at problem.
The present invention proposes in order to address the above problem just, and its purpose is to provide the simple structure of a kind of usefulness can reduce leakage electromagnetic wave outside, and the choke structure of the door of the thermatron that is easy to process.
The choke structure of the door of the thermatron that the present invention relates to has disposed a plurality of chokes that are split to form by a plurality of slits at each peripheral part of the door of thermatron; Above-mentioned choke structure only vertically is decided to be more than 3/16, below 5/16 of wavelength X of frequency of utilization separately with the above-mentioned choke of four jiaos at above-mentioned door.
In addition, this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits respectively around the door of thermatron; Above-mentioned choke structure, only the vertical fabric width of above-mentioned choke with four jiaos at above-mentioned door is decided to be more than 7/32, below 9/32 of wavelength X of frequency of utilization separately.
In addition, this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits respectively around the door of thermatron; Above-mentioned choke structure, only the vertical fabric width of above-mentioned choke of four jiaos at above-mentioned door is decided to be frequency of utilization separately wavelength X 1/4.
In addition, this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits respectively around the door of thermatron; Above-mentioned choke structure, only the vertical fabric width of above-mentioned choke with four jiaos at above-mentioned door is decided to be more than 1/4, below 5/16 of wavelength X of frequency of utilization separately.
Description of drawings
Fig. 1 is the back view of door for microwave oven shown in the embodiment of the present invention 1.
Fig. 2 is the choke structure enlarged drawing of door for microwave oven shown in the embodiment of the present invention 1.
Fig. 3 is the vertical fabric width of choke of four angle parts of door for microwave oven shown in the embodiment of the present invention 1 and the graph of a relation of leakage electromagnetic wave density.
Fig. 4 is the graph of a relation of the leakage electromagnetic wave density that causes of the gap between the door for microwave oven shown in the embodiment of the present invention 1 and the thermal treatment zone.
Fig. 5 is vertical fabric width spacing and the relation of leakage electromagnetic wave density and the diagram that existing use-case compares of the choke of door for microwave oven shown in the embodiment of the present invention 2.
Fig. 6 is the longitudinal choke fabric width spacing of choke of existing door with microwave oven and the graph of a relation of leakage electromagnetic wave density.
Mark among the figure:
1, all collar regions of choke structure 2, door 4, the thermal treatment zone
5, four angular regions 6, the choke 7 of four angular regions, choke
12, slit
Embodiment
Execution mode 1
Fig. 1 is the back view of the door for microwave oven shown in the embodiments of the present invention, and Fig. 2 is the enlarged drawing of the choke structure of Fig. 1.Fig. 3 is vertical fabric width and the graph of a relation that leaks by magnetic wave density of the choke of four jiaos at door, and Fig. 4 is the vertical fabric width of choke of four jiaos at door when changing slit between the door and the thermal treatment zone and the graph of a relation of leakage electromagnetic wave density.
Among Fig. 1, Fig. 2,2 is the door of microwave oven, the 1st, be separately positioned on door 2 edge, the choke structure that a plurality of chokes that are split to form by a plurality of slits 12 constitute, the 5th, four angular regions of the door 2 of formation (choke structure 1) opening, 6 is chokes (8 place) of four angular regions 5,7 is choke chokes in addition of four angular regions 5, the 4th, around the thermal treatment zone, the 8th, choke groove.
Because used choke structure, be easy to four jiaos of leakage electromagnetic waves from door, thereby in Fig. 1, formation shown in Figure 2, it or not the vertical fabric width of all chokes that changes choke structure 1, but only the choke (8 place) of 2 four jiao 5 at door is changed into various vertical fabric widths (L), investigate the electromagnetic wave density of leakage.
At first frequency of utilization is set at use of microwave ovens frequency 2.45GHz, tests wavelength X with respect to this frequency leakage electromagnetic wave density when being 3 λ/16 (about 23mm), 7 λ/32 (about 26.8mm), λ/4 (about 31mm), 9 λ/32 (about 34mm), 5 λ/16 (about 38mm) respectively.
Test result as shown in Figure 3.Because the specification of leakage electromagnetic wave density is after the microwave oven running, opens some door a little, before running is about to stop, is 5mw/cm in the value that records on the position of 5cm
2Below, thereby the size of electromagnetic wave density promptly is to be standard value with this specification, and its comparison value is shown.
Leakage electromagnetic wave density is minimum with the value of λ/4 as seen from Figure 3, approach 0, when at λ/then become big below 4 or when above, more than 3 λ/16, when 5 λ/16 are following, be below 2/5 of standard value, promptly 0.4, at 7 λ/more than 32, when 9 λ/32 are following, be below 1/5 of standard value, promptly 0.2.
As mentioned above, needn't change whole vertically fabric widths of choke 1, but only change choke 6 vertical fabric widths of door 2 four angle parts 5.Just can fully satisfy the specification requirement of leakage electromagnetic wave density.
General choke structure, because choke groove 8 is waveguides of top short circuit for the electromagnetic wave of advancing towards A direction shown in Figure 2, thereby the impedance of observing from the incidence point of choke groove 8 then becomes: Z=-jZctan β r (r: path, β: phase constant (2 π/λ), Zc: the impedance on the waveguide).
The operation principle of choke structure is by the degree of depth of choke groove 8 being set at λ/4, impedance is decided to be ∞, make it to reflect towards the A direction advance electromagnetic.
In addition, for the electromagnetic wave of advancing towards the B direction, then as described in above-mentioned document " be used for microwave oven prevent electromagnetic-wave leakage device " (utilizing periodic structure spare to prevent electromagnetic-wave leakage) (NationalTechnical Report Vo122, No2),, the slit can prevent electromagnetic-wave leakage on choke structure by being set.
The invention relates to over never the invention of choke 6 of opening part of four angular regions of the door considered.
At this, if the effect of explanation choke 6 is regarded the choke of 2 four jiaos at door the waveguide of the electromagnetic open-destination of vertically advancing as, then 12 observed impedances can be represented by the formula from the slit:
Z＝-jZc?cot?βr
R wherein: path
β: phase constant (2 π/λ)
Zc: the impedance on the waveguide
Thereby if the fabric width of choke is decided to be near λ/4, then be equivalent to impedance promptly near 0, the waveguide of top short circuit, so, because of can be by the reflection of the chokes 6 at four jiaos of places, thereby become a kind of choke structures that can effectively reduce electromagnetic wave from 2 four jiaos of leakages of door towards the electromagnetic wave of vertically advancing.
As mentioned above, preferably the fabric width (L) of the choke 6 (8 place) of four angular regions 5 of the opening part of the choke structure 1 that constitutes door 2 is set at 3 λ/16 above, 5 λ/16 following (when the use of microwave ovens frequency is 2.45GHz, about 23mm-38mm) of frequency of utilization.And preferably be set at above 9 λ/(the about 26.8mm-34mm) below 32 in 7 λ/32 or λ/4 (about 31mm).
Then, measured in door 2 and gap around the thermal treatment zone and be respectively under the situation of 1mm and 1.5mm, the leakage electromagnetic wave density when 2 four jiaos vertical amplitudes (L) of locating 5 choke 6 (8 place) are set at the wavelength X 1/8 (about 15.5mm) of microwave oven frequency of utilization 2.45GHz and 1/4 (about 31mm).Its result when the fabric width of choke when being λ/8 and λ/4, though open at door under the state of 1mm, does not have much differences as shown in Figure 4, and the leakage electromagnetic wave density when being opened to the 1.5mm slit when spacing is λ/4 then can reduce to about 1/3 of λ/8.Hence one can see that, and door 2 is big more with the gap of the periphery of the thermal treatment zone, and it is good more vertical fabric width (L) of the choke 6 of four angular regions 5 of door 2 to be decided to be near the effect of 1/4 (the about 31mm) of wavelength X of microwave oven frequency of utilization.
As mentioned above, be not that vertical fabric width with all chokes 5,7 of choke structure 1 all is fixed within certain particular range, but by vertical fabric width of the choke 6 of four angular regions 5 of door 2 is fixed in the certain limit promptly available this simple structure decrease leakage electromagnetic wave outside.
In addition, because as long as vertical fabric width of four jiaos choke 6 limited can realize within the specific limits, thereby there is no need to carry out high-precision processing, become more easy thereby make to process.
Execution mode 1 is that the choke structure of door for microwave oven only is set at certain-length with the vertical fabric width of choke at four jiaos of places of door, and present embodiment then is that the vertical fabric width of all chokes is set at certain-length.
Its structure be among Fig. 1 of execution mode 1 for the chokes 6 at four jiaos at door place and all chokes 7 beyond the choke 6, all its vertical fabric width (L) is set at the λ of the wavelength X of frequency of utilization separately/more than 4 respectively, 5 λ/below 16.
So, among each choke structure 1 of door 2, because of impedance is 0 the top waveguide near short circuit, for towards the electromagnetic wave of vertically advancing, impedance ratio 0 height of slit portion mouth, thereby can not leak from the slit but continue towards moving ahead, thereby effective choke structure formed, be set at certain value than the fabric width longitudinally four jiaos choke 6, the electromagnetic wave of its leakage still less.
And among existing use-case shown in Figure 5, reduce leakage electromagnetic wave density by further shortening spacing, but shown in the thick line of Fig. 6, with now with mode different be to be only optimal spacing near recognizing λ/4, thereby preferably the fabric width (L) of choke 6,7 is set at 3 λ of frequency of utilization/more than 16,5 λ/16 following (when the use of microwave ovens frequency is 2.45GHz, about 23mm-38mm).7 λ/more than 32, below 9 λ/32 (about 26.8mm-34mm), or λ/4 (about 31mm) is then better if can be set at.
As mentioned above, owing to choke 6,7 vertical fabric widths can be set within a certain scope, thereby there is no need to carry out high-precision processing, make processing become more easy, also can reduce leakage electromagnetic wave outside simultaneously.
Among present embodiment, be that choke 6,7 vertical fabric widths all are set at unified length, but also choke 6 can be set at complete unity that choke 7 then needn't be completely unified, but is set at 1 at least.
In addition, among embodiment 1,2, though lift to such an extent that be the example of structure of the door of microwave oven, what this technology was equally applicable to the door of other thermatron or other high-frequency device prevents leakage electromagnetic wave outside.
As mentioned above, according to the present invention, this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits around the door of thermatron; Because above-mentioned choke structure, only the vertical fabric width with the above-mentioned choke of four jiaos at above-mentioned door is set at more than 1/4, below 5/16 of wavelength X of frequency of utilization separately, thereby available simple structure can reduce leakage electromagnetic wave outside.
In addition, also needn't improve machining accuracy, process easier carrying out.
In addition, because this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits around the door of thermatron, above-mentioned choke structure only is set at more than 7/32, below 9/32 of wavelength X of frequency of utilization separately with vertical fabric width of above-mentioned four jiaos above-mentioned choke, thereby can reduce leakage electromagnetic wave outside with simple structure.
In addition, this choke structure is around the door of thermatron, disposed the choke that is split to form by a plurality of slits, above-mentioned choke structure only vertical fabric width of the above-mentioned choke of four jiaos at above-mentioned door is set at frequency of utilization separately wavelength X 1/4, thereby can reduce leakage electromagnetic wave outside with simple structure.
In addition, this choke structure is around the door of thermatron, disposed the choke that is split to form by a plurality of slits, because vertical fabric width of the above-mentioned Gardenia stream circle of above-mentioned choke structure to the above-mentioned door of major general is set at 1/4 or more of wavelength X of frequency of utilization separately, below 5/16, thereby can also make the electromagnetic further minimizing that leaks with simple structure.
In addition, needn't improve machining accuracy, process easier carrying out.
Claims (4)
1, a kind of choke structure of door of thermatron is characterized in that: this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits at each peripheral part of the door of thermatron; Above-mentioned choke structure only is set at vertical fabric width of four jiaos above-mentioned choke of above-mentioned door respectively more than 3/16, below 5/16 of wavelength X of frequency of utilization.
2, a kind of choke structure of door of thermatron is characterized in that: this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits at each peripheral part of the door of thermatron; Above-mentioned choke structure only is set at vertical fabric width of four jiaos above-mentioned choke of above-mentioned door respectively more than 7/32, more than 9/32 of wavelength X of frequency of utilization.
3, a kind of choke structure of door of thermatron is characterized in that: this choke structure has disposed a plurality of chokes that are split to form by a plurality of slits at each peripheral part of the door of thermatron; Above-mentioned choke structure only vertical fabric width of four jiaos above-mentioned choke of above-mentioned door is decided to be frequency of utilization separately wavelength X 1/4.
4, a kind of choke structure of door of thermatron is characterized in that:
This choke structure has disposed a plurality of chokes that are split to form by a plurality of slits around the door of thermatron; Above-mentioned choke structure to vertical fabric width of the above-mentioned choke of four jiaos at the above-mentioned door of major general is set at more than 1/4 of wavelength X of the frequency of using separately, below 5/16.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002037554A JP2003243150A (en) | 2002-02-15 | 2002-02-15 | Choke structure of door for high-frequency heating device |
| JP037554/2002 | 2002-02-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1438822A true CN1438822A (en) | 2003-08-27 |
| CN1244254C CN1244254C (en) | 2006-03-01 |
Family
ID=27678118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031038182A Expired - Fee Related CN1244254C (en) | 2002-02-15 | 2003-02-12 | Choking structure of door of high-frequency heating device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2003243150A (en) |
| KR (1) | KR20030069081A (en) |
| CN (1) | CN1244254C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604143A (en) * | 2013-11-20 | 2014-02-26 | 广东威特真空电子制造有限公司 | Double-frequency microwave oven door and double-frequency microwave oven |
| CN103836684A (en) * | 2012-11-23 | 2014-06-04 | 美的集团股份有限公司 | Oven door assembly for microwave oven and microwave oven including oven door assembly |
| CN106066051A (en) * | 2016-06-28 | 2016-11-02 | 广东美的厨房电器制造有限公司 | A kind of microwave oven |
| CN106678897A (en) * | 2016-12-29 | 2017-05-17 | 广东美的厨房电器制造有限公司 | Drawer-type microwave oven |
| CN104456661B (en) * | 2013-09-18 | 2018-07-13 | 广东美的厨房电器制造有限公司 | Frame members for micro-wave oven and fire door component, micro-wave oven with it |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100574857B1 (en) * | 2003-10-01 | 2006-04-27 | 엘지전자 주식회사 | Shielding apparatus for electro-magnetic wave of oven door |
| JP3892458B2 (en) | 2004-12-08 | 2007-03-14 | 株式会社ジャムコ | microwave |
| JP4127553B2 (en) | 2005-09-08 | 2008-07-30 | シャープ株式会社 | Cooker |
| EP2594111B1 (en) * | 2010-07-15 | 2015-10-28 | Goji Limited | A choke for an oven |
| JP2023079369A (en) * | 2021-11-29 | 2023-06-08 | 日立グローバルライフソリューションズ株式会社 | Cooker |
-
2002
- 2002-02-15 JP JP2002037554A patent/JP2003243150A/en active Pending
-
2003
- 2003-02-12 CN CNB031038182A patent/CN1244254C/en not_active Expired - Fee Related
- 2003-02-14 KR KR10-2003-0009268A patent/KR20030069081A/en not_active Application Discontinuation
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103836684A (en) * | 2012-11-23 | 2014-06-04 | 美的集团股份有限公司 | Oven door assembly for microwave oven and microwave oven including oven door assembly |
| CN103836684B (en) * | 2012-11-23 | 2016-10-12 | 美的集团股份有限公司 | For the fire door assembly of microwave oven and the microwave oven with it |
| CN104456661B (en) * | 2013-09-18 | 2018-07-13 | 广东美的厨房电器制造有限公司 | Frame members for micro-wave oven and fire door component, micro-wave oven with it |
| CN103604143A (en) * | 2013-11-20 | 2014-02-26 | 广东威特真空电子制造有限公司 | Double-frequency microwave oven door and double-frequency microwave oven |
| CN103604143B (en) * | 2013-11-20 | 2015-10-14 | 广东威特真空电子制造有限公司 | Bifrequency door of microwave oven and bifrequency micro-wave oven |
| CN106066051A (en) * | 2016-06-28 | 2016-11-02 | 广东美的厨房电器制造有限公司 | A kind of microwave oven |
| CN106066051B (en) * | 2016-06-28 | 2018-09-11 | 广东美的厨房电器制造有限公司 | A kind of micro-wave oven |
| CN106678897A (en) * | 2016-12-29 | 2017-05-17 | 广东美的厨房电器制造有限公司 | Drawer-type microwave oven |
| CN106678897B (en) * | 2016-12-29 | 2019-07-26 | 广东美的厨房电器制造有限公司 | Drawer-type microwave oven |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20030069081A (en) | 2003-08-25 |
| JP2003243150A (en) | 2003-08-29 |
| CN1244254C (en) | 2006-03-01 |
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Granted publication date: 20060301 Termination date: 20100212 |