CN102843799B - Device and method for suppressing electromagnetic leakage of microwave oven - Google Patents
Device and method for suppressing electromagnetic leakage of microwave oven Download PDFInfo
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- CN102843799B CN102843799B CN201210294686.0A CN201210294686A CN102843799B CN 102843799 B CN102843799 B CN 102843799B CN 201210294686 A CN201210294686 A CN 201210294686A CN 102843799 B CN102843799 B CN 102843799B
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Abstract
The invention relates to a device for suppressing the electromagnetic leakage of a microwave oven, which is characterized by comprising a box-gap shielding component, a box-hole shielding metal wire mesh, a metal isolating cover (15) and a metal isolating wall (19). The box-gap shielding component is a one-sided sawtooth-shaped beryllium copper reed (1); the box-hole shielding metal wire mesh is arranged on the round-hole areas on two sides of the wall of the microwave oven; the metal isolating cover (15) is assembled together with assembling box of a low-voltage circuit unit through two screw holes at the upper end and the bottom and hereby covers the low-voltage circuit unit; and the metal isolating wall (19) is arranged at the bottom of a microwave stirrer (7) at the tail end of a microwave launching and transmitting channel (18). Due to the adoption of the device, the difficulty of shielding the gap of the shell of the microwave oven is reduced, 90% of high-frequency electromagnetic waves are suppressed from leaking outside, and the purpose of preventing the electromagnetic leakage is achieved.
Description
Technical field
The present invention relates to a kind of anti-electromagnetic radiation device, relate in particular to a kind of restraining device of microwave oven electromagnetic leakage and adopt the method for this device.
Background technology
Household microwave oven by electric-control system by AC220V alternating voltage by high-tension transformer and high-voltage rectifier, convert the direct voltage of about 4000V to, deliver to microwave magnetron and produce 2.45GHz electromagnetic wave and carry out heat food.Microwave energy is evenly dispersed and is imported in furnace chamber by stirring ripple device after by waveguide, and forms multiple reflections in metal furnace chamber, and most of reflected wave penetrates food and reach the object of heat food.But, conventionally producing in microwave emission process in microwave oven electric-control system, relate to interference and coupling between the circuit such as high voltage circuit, low voltage circuit, and in microwave transmission passage process, part electromagnetic wave passes through the approach such as housing gap, furnace chamber hole to external leakage or disturbs electric-control system, can cause between first device, cable produce coupling and disturb, with conduction pattern to external leakage, thereby endanger closely microwave oven user.
At present, the inhibition method of microwave oven electromagnetic leakage mainly comprises: 1) utility model patent 201020191090.4 discloses a kind of microwave oven radiation-proof curtain, comprise cord main body and fixture, cord size of main body is not less than door for microwave oven and adopts radiation proof material, fixture is arranged at the top margin of cord main body, for cord main body is fixed on to door for microwave oven, can effectively reduce microblogging radiation; 2) utility model patent 201020612943.7 discloses a kind of anti-radiation cabinet of microwave oven, comprises top board, base plate, backboard, door-plate and two side plates be made up of barium sulfate composite plate, is provided with the interior bar shaped air-vent to tilting on top board and backboard; Top board, base plate, backboard are and are fixedly connected with two side plates, and door-plate is with side plate for being flexibly connected, and this barium sulfate composite plate is pollution-free, radiation proof.3) patent of invention 200710059524.8 discloses a kind of microwave oven door frame with dual choke chamber, inside the outer side edges that forms groove warpage is protruded, groove is divided into two parts that are interconnected with two choke chambers, and chokes effect is strong, and microwave is difficult for leaking.Above microwave oven electromagnetic leakage radiation proof treatment method is only unicity, on the one hand, user is brought inconvenience in use procedure; On the other hand, can not comprehensively solve product root and comprehensive anti-electromagnetic leakage, bring certain harm to user.Therefore be badly in need of a kind of device that fundamentally suppresses microwave oven electromagnetic leakage.
Summary of the invention
The present invention is by adopting radiation source to take isolation design, the microwave leakages such as micro-wave oven casing gap, hole are shielded and improve the measure of housing conduction continuity, effectively prevent between high-low voltage circuit unit producing coupling and disturb, thereby and strong electromagnetic radiation source to the interference of high-low voltage circuit unit improved microwave oven fail safe, reduced microwave leakage.
The technical scheme of this aspect has been to provide a kind of microwave oven electromagnetic leakage restraining device, it is characterized in that, this device comprises casing gap shield member, casing hole shielded metal silk screen, metal cage and metal divider wall; Wherein:
Casing gap shield member is monolateral sawtooth pattern beryllium copper reed, and described monolateral sawtooth pattern beryllium copper reed is installed on respectively upper and lower two conducting surfaces in microwave oven main body fire door edge, upper and lower two conducting surfaces in microwave oven body rear edge and microwave oven bottom left and right sides conducting surface, left and right, microwave oven main body fire door edge conducting surface, left and right, microwave oven body rear edge conducting surface;
Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundum regions, electromagnetic oven furnace wall;
Metal cage assembles by two screws of upper end, bottom and the assembling box of low voltage circuit unit, thereby metal cage is covered outside low voltage circuit unit;
The microwave that metal divider wall is arranged at microwave transmitting transmission channel end stirs ripple device bottom, in the time that microwave oven is in running order, metal divider wall passes passage and microwave by microwave transmitting and stirs the frequency electromagnetic waves that ripple device disperses and shield and reflection loss, thereby makes frequency electromagnetic waves be suppressed at metal divider wall inside.
Further, in the time of microwave oven back cover and main body assembling, microwave oven back cover inner side is crimped on the monolateral sawtooth pattern beryllium copper reed on the each conducting surface of microwave oven main body, thereby reduces gap and the gap length of both assemblings, makes whole microwave cabinet form a successional shield of conduction.
Further, the material of described metal cage is galvanized steel plain sheet, and the thickness of this metal cage is 0.8mm.
Further, described metal divider wall edge forms bending, and face of metal divider wall stirs ripple device bottom with microwave and overlaps.
The invention has the beneficial effects as follows: the present invention is directed to the radiation sources such as strong electromagnetic radiation, high low voltage circuit unit, crystal oscillator and adopted isolation design, suppress the microwave leakage of household microwave oven by shielding and improve the electromagnetic radiation braking measures such as housing conduction continuity for microwave leakage approach such as micro-wave oven casing gap, holes, reduce the difficulty to the shielding of micro-wave oven casing gap, 90% frequency electromagnetic waves suppressing and reduced microwave oven is penetrated to leaking, thereby has reached the object of anti-electromagnetic leakage.
Brief description of the drawings
The schematic diagram of the monolateral sawtooth pattern beryllium copper reed on Fig. 1-a microwave oven upside of the present invention and right side;
Fig. 1-b is Fig. 1-a partial enlarged drawing;
Fig. 2-a is the schematic diagram that is arranged at the monolateral sawtooth pattern beryllium copper reed in microwave oven downside of the present invention and left side;
Fig. 2-b is Fig. 2-a partial enlarged drawing;
Fig. 3 microwave produces schematic diagram;
Fig. 4-a metal cage schematic diagram;
Fig. 4-b is Fig. 4-a partial enlarged drawing;
Fig. 5 is metal divider wall partial enlarged drawing.
Wherein: the monolateral sawtooth reed of 1-, 2-microwave oven main body, 3-microwave oven body rear, 4-fire door edge, 5-microwave oven shell, 6-microwave oven bottom, 7-microwave stirs ripple device, 8-microwave oven bottom left side conducting surface, 9-transformer, 10-magnetron, 11-fan, 12-microwave oven electric-control system, 13-microwave transmitter unit, 14-radiation source, 15-metal cage, 16-high-tension circuit unit, 17-low-voltage circuit unit, 18-microwave transmitting transmission channel, 19-metal divider wall.
Embodiment
Therefore, thus the microwave leakage that the present invention suppresses household microwave oven to microwave leakage approach such as micro-wave oven casing gap, holes by electromagnetic radiation braking measures such as shielding, isolation has fundamentally been realized the effect of Leakage prevention.
Because the metal shell of microwave oven can exist certain mismachining tolerance in the course of processing, while causing shell and microwave oven cavity crimping, can there is certain gap (more than about 10cm) in housing surrounding.When housing gap length be greater than 6cm(microwave wavelength 1/2) time, between high voltage circuit and low voltage circuit, produce and disturb and coupling, when common mode current or induced current flow through, impedance is therebetween larger, can produce pressure drop, and pressure drop drives the gap that becomes antenna, microwave will leak in a large number by gap, according to the screening effectiveness theory of computation, when being wavelength, housing gap length will start to produce decay 1/2 time, just there is screening effectiveness.If reduce 90% of microwave radiation energy, the 20dB that will decay, want≤6mm of the gap of shield could meet the requirement of Leakage prevention.Therefore, the present invention has adopted following shielding mode.
1) casing gap screening arrangement
Shown in Fig. 1-2, the present invention preferably have compatible with the electrochemistry of other contact surface and can be in multiple environment the monolateral sawtooth pattern beryllium copper reed 1 of works fine, to be arranged on respectively conducting surface and left and right sides six place's conducting surfaces everywhere up and down of microwave oven main body 2 with gum bonding method.
Wherein, the monolateral sawtooth pattern beryllium copper reed of conducting surface installation site comprises everywhere up and down: be installed on microwave oven master 2 upper and lower two conducting surfaces in fire door edge 4, upper and lower two conducting surfaces in microwave oven body rear 3 edges;
The monolateral sawtooth pattern beryllium copper reed of left and right sides conducting surface installation site comprises: microwave oven bottom 6 left and right sides conducting surfaces, microwave oven main body 2 fire door edge 4 left and right conducting surfaces, microwave oven body rear 3 left and right, edge conducting surfaces, make the microwave oven main body left and right sides form two " U " type structures six monolateral sawtooth pattern beryllium copper reeds are installed.
In sum, in the time of microwave oven back cover and main body assembling, microwave oven back cover inner side is closely crimped on the monolateral sawtooth pattern beryllium copper reed on microwave oven main body 20 place's conducting surfaces, reduce gap and the gap length of both assemblings, make whole microwave cabinet form a successional shield of conduction, the electromagnetic wave that the each function element in microwave cabinet inside is produced is by multiple reflections and the absorption loss of conduction continuity shield, 90% electromagnetic wave outside suppressing and reduced microwave oven is let out and is penetrated, thereby has reached the object of anti-electromagnetic leakage.
2) casing hole shielded metal silk screen
Because the shield shell of microwave oven can not be airtight completely, tend to relate to ventilation and heat or cable I/O, on casing, the factor such as the electromagnetic leakage of perforate and the shape in hole, electromagnetic frequency and distance, hole number is relevant, has a strong impact on the screen effect of shield if hole designs unreasonable meeting.Due to microwave oven because baking function in furnace chamber top design the hole of about 10mm, and the ventilating heat dissipating hole of the 3mm that has an appointment in furnace chamber both sides; In addition, the about 0.8mm of furnace chamber thickness of slab, calculates by waveguide, and the about 16dB of its screening effectiveness, is less than 20dB.When microwave is during in interreflection, while having electric current to flow through on surface, furnace wall, because hole exists, induced current path changes, and now, the induced current after variation can not all have been offset source electromagnetic field, and part electromagnetic field is leaked to shield is outside, and disturb electric-control system.
To sum up analyze, guaranteeing that microwave oven has under good heat extraction, hot gas performance prerequisite, covered a kind of shielding that there is the woven wire (approximately 70 order) using and realize hole leakage under the adverse circumstances such as high heat, high humidity, high greasy dirt in two mother rib lateral rotundum regions, furnace wall, further the electromagnetic wave leaking by circular hole is increased to reflecting surface, reduce to electric-control system or outside radiation.
3) metal spacer assembly
Isolation design is mainly taked local shielding to strong electromagnetic radiation source or the extremely sensitive circuit etc. of microwave oven, reduces the interference of strong electromagnetic radiation source to other control circuit unit.
The electric-control system of microwave oven generally includes high-tension circuit, low-voltage circuit and microwave transmission passage three parts.
Circuit after high-tension transformer secondary winding is high-tension circuit, mainly civil power AC220V is converted to the direct voltage of 4000V left and right by devices such as high-voltage capacitor, high-tension transformer, high-voltage diodes, delivers to microwave magnetron and produces 2.45GHz electromagnetic wave;
High-tension transformer armature winding is low-voltage circuit to the circuit between microwave oven supply power entrance before, has also comprised control circuit; Control circuit mainly comprises low-tension transformer, protective tube, thermal circuit beraker protection switch, interlocking sensitive switch, illuminating lamp, crystal oscillator and power divider switch, rotary tray motor, fan electromotor etc.
As shown in Figure 3, for microwave produces schematic diagram.Transformer 9 is powered to magnetron 10, and the electromagnetic wave that magnetron 10 produces 2.45GHz is evenly dispersed and imported in furnace chamber by stirring ripple device 7 after by waveguide.The mode of launched microwave can have side-emitted and bottom surface transmitting.In microwave oven, be also provided with fan 11, carry out cooling to transformer 9 and magnetron 10.Wherein, survey according to field intensity meter, the low-tension transformer in control circuit and crystal oscillator are also one of main radiated interference sources.
As shown in Fig. 4-a and 4-b, the present invention prevents the leakage of radiation by metal cage 15 is set.Metal cage 15 is cuboid.Upper end and bottom at metal cage 15 are provided with screw.Metal cage 15 assembles by two screws of upper end, bottom and the assembling box of low voltage circuit unit, and metal cage 15 is covered outside low voltage circuit unit.The material of metal cage 15 is galvanized steel plain sheets, and this material conductance is high, has good electromagnet shield effect.The gap that this metal cage 15 contacts with assembling box, without special processing mode, only needs metal surface contact, reaches good shield effectiveness.The thickness of this metal cage 15 is 0.8mm, and this thickness can reach good shield effectiveness on the basis of saving material.The electromagnetic wave by metal cage 15, the device such as crystal oscillator, relay in low voltage circuit unit being produced on the one hand shields; On the other hand, the present invention is directed to low voltage circuit unit (microcomputer control unit) by using metal cage 15, prevent the interference of high voltage circuit unit (transformer boost parts) to low voltage circuit unit, and prevent that microwave transmitting transmission channel 18 and microwave from stirring ripple device 7 etc. and dispersing the interference of frequency electromagnetic waves to low voltage circuit unit, reduce the difficulty to the shielding of micro-wave oven casing gap.
4) metal divider wall
As shown in Figure 5.The present invention is according to microwave oven existing structure, design metal divider wall 19 and stir ripple device 7 bottoms by screw or copper-foil conducting electricity installation (paste, fix) at the microwave of microwave transmitting transmission channel 18 ends, can eliminate metal divider wall 19 and stir with microwave the gap that ripple device 7 contacts.These metal divider wall 19 edges form bending, make itself and microwave stir ripple device 7 bottom overlap joints, so that radiation proof better.The material of this metal divider wall 19 is galvanized steel plain sheet, and this material conductance is high, has good electromagnet shield effect.The thickness of this metal divider wall 19 is 0.8mm, and this thickness can reach good shield effectiveness on the basis of saving material.In the time that microwave oven is in running order, divider wall can be effectively passes passage and microwave by microwave transmitting and stirs the frequency electromagnetic waves that ripple device 7 disperses and shield and reflection loss, frequency electromagnetic waves is suppressed to divider wall inside, prevents that frequency electromagnetic waves from producing and disturbing low voltage circuit unit, high voltage circuit unit.The present invention has reduced the difficulty to micro-wave oven casing gap shielding, suppresses and 90% frequency electromagnetic waves that reduced microwave oven is penetrated to leaking, thereby has reached the object of anti-electromagnetic leakage.
Survey and let out instrument measurement result analysis (microwave leakage <0.2W/m according to microwave
2), this measure has reduced the interference of radiated interference source to extremely sensitive circuit or has suppressed electromagnetic radiation to external leakage from entire system.
Claims (3)
1. a microwave oven electromagnetic leakage restraining device, is characterized in that, this device comprises casing gap shield member, casing hole shielded metal silk screen, metal cage and metal divider wall; Wherein:
Casing gap shield member is monolateral sawtooth pattern beryllium copper reed (1), and monolateral sawtooth pattern beryllium copper reed (1) is installed on respectively upper and lower two conducting surfaces in microwave oven main body (2) fire door edge (4), upper and lower two conducting surfaces in microwave oven body rear (3) edge and microwave oven bottom (6) left and right sides conducting surface, left and right, microwave oven main body (2) fire door edge (4) conducting surface, microwave oven body rear (3) left and right, edge conducting surface; In the time of microwave oven back cover and main body assembling, microwave oven back cover inner side is crimped on the monolateral sawtooth pattern beryllium copper reed on the each conducting surface of microwave oven main body (2), thereby reduce gap and the gap length of both assemblings, make whole microwave cabinet form a successional shield of conduction; Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundum regions, electromagnetic oven furnace wall;
Metal cage (15) assembles by two screws of upper end, bottom and the assembling box of low voltage circuit unit, thereby metal cage (15) is covered outside low voltage circuit unit; This metal cage (15) contacts with the metal surface of assembling box; Potential circuit unit is by using metal cage (15), prevent the interference of high voltage circuit unit to low voltage circuit unit, prevent that microwave transmitting transmission channel (18) and microwave from stirring ripple device (7) and dispersing the interference of frequency electromagnetic waves to low voltage circuit unit simultaneously;
The microwave that metal divider wall (19) is arranged at microwave transmitting transmission channel (18) end stirs ripple device (7) bottom, in the time that microwave oven is in running order, metal divider wall (19) passes passage (18) and microwave by microwave transmitting and stirs the frequency electromagnetic waves that ripple device (7) disperses and shield and reflection loss, thereby makes frequency electromagnetic waves be suppressed at metal divider wall (19) inside; This metal divider wall (19) edge forms bending, makes itself and microwave stir ripple device (7) bottom overlap joint.
2. microwave oven electromagnetic leakage restraining device according to claim 1, is characterized in that: the material of described metal cage (15) is galvanized steel plain sheet, the thickness of this metal cage (15) is 0.8mm.
3. a microwave oven electromagnetic leakage inhibition method, is characterized in that, the method has adopted microwave oven electromagnetic leakage restraining device claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210294686.0A CN102843799B (en) | 2012-08-17 | 2012-08-17 | Device and method for suppressing electromagnetic leakage of microwave oven |
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| CN201210294686.0A CN102843799B (en) | 2012-08-17 | 2012-08-17 | Device and method for suppressing electromagnetic leakage of microwave oven |
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| CN102843799B true CN102843799B (en) | 2014-11-05 |
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| CN108966621B (en) * | 2018-07-20 | 2020-01-31 | 上海空间电源研究所 | Electromagnetic shielding case with shock-absorbing function |
| CN112303686B (en) * | 2019-07-29 | 2023-10-10 | 青岛海尔特种电冰柜有限公司 | Choke structure, furnace door with same and microwave oven |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004053245A (en) * | 2002-05-31 | 2004-02-19 | Matsushita Electric Ind Co Ltd | Heating cooker |
| CN2637939Y (en) * | 2003-01-31 | 2004-09-01 | 同济大学 | Microwave oven shell |
| KR20050031286A (en) * | 2003-09-29 | 2005-04-06 | 삼성전자주식회사 | Microwave oven |
| CN2716892Y (en) * | 2004-07-13 | 2005-08-10 | 安方高科信息安全技术(北京)有限公司 | Computer with low electromagnetic leakage emission and high reliability |
| KR20070000260A (en) * | 2005-06-27 | 2007-01-02 | 엘지전자 주식회사 | Prevention apparatus of microwave leakage of microwave oven |
| CN1955557A (en) * | 2005-10-28 | 2007-05-02 | 乐金电子(天津)电器有限公司 | Protection structure of roasting pipe of microwave oven |
| CN101245925A (en) * | 2008-03-21 | 2008-08-20 | 美的集团有限公司 | Shielding structure of microwave electromagnetic field cavity opening aperture |
| CN102455006A (en) * | 2010-10-22 | 2012-05-16 | 乐金电子(天津)电器有限公司 | Microwave oven |
| CN201903089U (en) * | 2010-11-19 | 2011-07-20 | 李文庆 | Novel structure of microwave electric oven |
| CN202799247U (en) * | 2012-08-17 | 2013-03-13 | 安方高科电磁安全技术(北京)有限公司 | Microwave oven electromagnetic leakage suppressing device |
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