CN203086772U - Microwave oven electromagnetic leakage suppression device - Google Patents
Microwave oven electromagnetic leakage suppression device Download PDFInfo
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- CN203086772U CN203086772U CN 201320023997 CN201320023997U CN203086772U CN 203086772 U CN203086772 U CN 203086772U CN 201320023997 CN201320023997 CN 201320023997 CN 201320023997 U CN201320023997 U CN 201320023997U CN 203086772 U CN203086772 U CN 203086772U
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Abstract
The utility model relates to a microwave oven electromagnetic leakage suppression device which comprises box body gap shielding parts, box body hole shielding metal meshes, a microwave transmitting unit metal isolation hood, a high-voltage circuit unit metal isolation hood, a low-voltage circuit unit metal isolation hood and a metal isolation wall. The box body gap shielding parts are reeds. The box body hole shielding metal meshes are arranged in round hole areas on both sides of the wall of a microwave oven. The microwave transmitting unit metal isolation hood is assembled with an assembly box of a microwave transmitting unit through four screw holes on four sides. The high-voltage circuit unit metal isolation hood is assembled with an assembly box of a high-voltage circuit unit through four screw holes on four sides. The low-voltage circuit unit metal isolation hood is assembled with an assembly box of a low-voltage circuit unit through two screw holes on the upper end and the bottom. The metal isolation wall is arranged on the bottom of a microwave stirring device on the tail end of a microwave emission transmission channel. According to the utility model, the shielding difficulty of gaps on a microwave oven casing body is reduced, and electromagnetic wave leakage radiation is suppressed and reduced.
Description
Technical field
The utility model relates to a kind of anti-electromagnetic radiation device, relates in particular to a kind of restraining device of microwave oven electromagnetic leakage.
Background technology
Household microwave oven by electric-control system with the AC220V alternating voltage by high-tension transformer and high-voltage rectifier, convert the direct voltage about 4000V to, deliver to microwave magnetron and produce the 2.45GHz electromagnetic wave and come heat food.Microwave energy is evenly dispersed and is imported in the furnace chamber by stirring the ripple device after by waveguide, and forms repeatedly reflection in the metal furnace chamber, and most of reflected wave penetrates the purpose that food reaches heat food.But, usually producing in the microwave emission process in the microwave oven electric-control system, relate to interference and coupling between the circuit such as high voltage circuit, low voltage circuit, and the part electromagnetic wave passes through approach such as housing slit, furnace chamber hole to external leakage or interference electric-control system in the microwave transmission passage process, can cause between first device, cable produces 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, the 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, be used for the cord main body is fixed on door for microwave oven, can effectively reduce the microblogging radiation; 2) utility model patent 201020612943.7 discloses a kind of microwave oven radiation-proof cabinet, comprises top board, base plate, backboard, door-plate and two side plates of being made by the barium sulfate composite plate, is provided with interior to the bar shaped air-vent that tilts on top board and the backboard; Top board, base plate, backboard are with two side plates fixedlys connected, and door-plate and side plate are for flexibly connecting, 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 that has dual choke chamber, the inside warpage of the outer side edges that forms groove is protruded, groove is divided into two parts that are interconnected that have two choke chambers, and the chokes effect is strong, and microwave is difficult for leaking.Above microwave oven electromagnetic leakage radiation proof treatment method only is a unicity, on the one hand, the user is brought inconvenience in use; On the other hand, can not comprehensively solve product root and comprehensively anti-electromagnetic leakage, bring certain harm to the user.Therefore be badly in need of a kind of device that fundamentally suppresses the microwave oven electromagnetic leakage.
The utility model content
The utility model is taked isolation design, microwave leakages such as micro-wave oven casing slit, hole is shielded and improve the measure of housing conduction continuity by adopting radiation source, effectively prevent between the high and low pressure circuit unit to produce coupling and disturb, thereby and the strong electromagnetic radiation source to the interference of high and low pressure circuit unit improved microwave oven fail safe, reduced microwave leakage.
The technical solution of the utility model provides a kind of microwave oven electromagnetic leakage restraining device, comprises casing slit shield member, casing hole shielded metal silk screen, microwave transmitter unit metal cage, high-tension circuit unit metal cage, low-voltage circuit unit metal cage and metal divider wall; Wherein:
Casing slit shield member is a reed, and described reed is installed on up and down two conducting surfaces, microwave oven body rear edge two conducting surfaces and microwave oven bottom left and right sides conducting surface, the left and right sides, microwave oven main body fire door edge conducting surface, the left and right sides, microwave oven body rear edge conducting surface up and down of microwave oven main body fire door edge respectively;
Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundum zones, electromagnetic oven furnace wall;
Microwave transmitter unit metal cage is by box-packed the joining of assembling of four screws and the microwave transmitter unit of four sides, covers outside the microwave transmitter unit thereby microwave transmitter unit metal isolated;
High-tension circuit unit metal cage assembles by four screws of four sides and the assembling box of high-tension circuit unit, thereby high-tension circuit unit metal cage is covered outside the high-tension circuit unit;
Low-voltage circuit unit metal cage assembles by two screws of upper end, bottom and the assembling box of low-voltage circuit unit, thereby low-voltage circuit unit metal cage is covered outside the low-voltage circuit unit;
The metal divider wall is arranged at the microwave that microwave emission transmission channel do not hold and stirs ripple device bottom, when microwave oven is in running order, the metal divider wall passes passage and microwave with microwave emission and stirs the frequency electromagnetic waves that the ripple device dispersed and shield and reflection loss, thereby makes frequency electromagnetic waves be suppressed at metal divider wall inside.
Further, when microwave oven back cover and main body assembling, microwave oven back cover inboard is crimped on the reed on each conducting surface of microwave oven main body, thereby reduces the slit and the gap length of both assemblings, makes whole microwave cabinet form a successional shield of conduction.
Further, described reed comprises monolateral zigzag beryllium copper reed, bilateral zigzag beryllium copper reed and rectangle reed; Also can be the reed or the analog of other suitable shapes or material, reach the function of the microwave leakage that suppresses household microwave oven.
Further, the material of described microwave transmitter unit metal cage is a galvanized steel plain sheet, also can be other materials that are fit to; The thickness of this microwave transmitter unit metal cage is 0.8mm, also can be other thickness that are fit to.
Further, the material of described high-tension circuit unit metal cage is a galvanized steel plain sheet, also can be other materials that are fit to; The thickness of this high-tension circuit unit metal cage is 0.8mm, also can be other thickness that are fit to.
Further, the material of described low-voltage circuit unit metal cage is a galvanized steel plain sheet, also can be other materials that are fit to; The thickness of this low-voltage circuit unit metal cage is 0.8mm, also can be other thickness that are fit to.
Further, described metal divider wall edge forms bending, and a face of metal divider wall stirs ripple device bottom with microwave and overlaps.
The beneficial effects of the utility model are: the utility model has been adopted isolation design at radiation sources such as strong electromagnetic radiation, hi-lo circuit unit, crystal oscillators, the microwave leakage that suppresses household microwave oven at microwave leakage approach such as micro-wave oven casing slit, holes by electromagnetic radiation braking measures such as shielding and improvement housing conduction continuitys, reduced difficulty to the shielding of micro-wave oven casing slit, 90% frequency electromagnetic waves that suppresses and reduced microwave oven is penetrated to leaking, thereby has reached the purpose of anti-electromagnetic leakage.
Description of drawings
The schematic diagram of the monolateral sawtooth pattern beryllium copper reed on Fig. 1-a microwave oven upside of the present utility model 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 utility model and left side;
Fig. 2-b is Fig. 2-a partial enlarged drawing;
Fig. 3 microwave produces schematic diagram;
Fig. 4-a low-voltage circuit unit metal cage schematic diagram;
Fig. 4-b is Fig. 4-a partial enlarged drawing;
Fig. 4-c microwave transmitter unit metal cage schematic diagram;
Fig. 4-d high-tension circuit unit metal cage schematic diagram;
Fig. 5 is a 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, the 5-microwave oven shell, 6-microwave oven bottom, the 7-microwave stirs the ripple device, 8-microwave oven bottom left side conducting surface, the 9-transformer, 10-magnetron, 11-fan, 12-microwave oven electric-control system, 13-microwave transmitter unit, 14-radiation source, 15-low-voltage circuit unit metal cage, 16-high-tension circuit unit, 17-low-voltage circuit unit, 18-microwave emission transmission channel, 19-metal divider wall, 20-high-tension circuit unit metal cage, 21-microwave transmitter unit metal cage.
Embodiment
Therefore, thus the microwave leakage that the utility model suppresses household microwave oven to microwave leakage approach such as micro-wave oven casing slit, holes by electromagnetic radiation braking measures such as shielding, isolation has fundamentally realized preventing the effect of leaking.
Because can there be certain mismachining tolerance in the metal shell of microwave oven in the course of processing, when causing shell and microwave oven cavity crimping, can there be certain slit (more than about 10cm) around the housing.When the housing gap length greater than 6cm(microwave wavelength 1/2) time, produce between high-tension circuit and the low-voltage circuit and disturb and coupling, common mode current or induced current flow are out-of-date, impedance therebetween is bigger, can produce pressure drop, and pressure drop drives the slit that becomes antenna, microwave will leak in a large number by the slit, according to the screening effectiveness theory of computation, when the housing gap length be wavelength 1/2 the time will begin to produce decay, promptly just have screening effectiveness.If will reduce 90% of microwave radiation energy, the 20dB that promptly will decay, then the slit of shield want≤6mm could satisfy and prevent the requirement of leaking.Therefore, the utility model has adopted following shielding mode.
1) casing slit screening arrangement
Shown in Fig. 1-a to Fig. 2-b, the utility model preferably have with the electrochemistry of other contact surface compatible and can be in multiple environment the monolateral sawtooth pattern beryllium copper reed 1 of works fine, be installed in conducting surface and left and right sides six place's conducting surfaces everywhere up and down of microwave oven main body 2 respectively with band gum bonding method.Reed shape of the present utility model is not restricted to monolateral sawtooth pattern beryllium copper reed, and it also can be other shape or material or reed analogs of being fit to.
Wherein, up and down everywhere the monolateral sawtooth pattern beryllium copper of conducting surface reed installation site comprise: be installed on microwave oven main body 2 fire door edges two conducting surfaces about in the of 4, microwave oven body rear 3 edges two conducting surfaces up and down;
The monolateral sawtooth pattern beryllium copper of left and right sides conducting surface reed installation site comprises: microwave oven bottom 6 left and right sides conducting surfaces, microwave oven main body 2 fire door edges 4 left and right sides conducting surfaces, the left and right sides, microwave oven body rear 3 edge conducting surface 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, when microwave oven back cover and main body assembling, microwave oven back cover inboard closely is crimped on the monolateral sawtooth pattern beryllium copper reed on microwave oven main body 20 place's conducting surfaces, reduce the slit and the gap length of both assemblings, make whole microwave cabinet form a successional shield of conduction, the electromagnetic wave of each function element generation of microwave cabinet inside is passed through the repeatedly reflection and the absorption loss of conduction continuity shield, 90% electromagnetic wave outside that suppresses and reduced microwave oven is let out and is penetrated, thereby has reached the purpose of anti-electromagnetic leakage.
2) casing hole shielded metal silk screen
Because the shield shell of microwave oven can not be airtight fully, tend to relate to ventilation and heat or cable I/O, the electromagnetic leakage of perforate and the shape in hole on the casing, electromagnetic frequency are relevant with factors such as distance, hole number, imitate if hole designs the screen that unreasonable meeting has a strong impact on shield.Because microwave oven because baking function in the furnace chamber top design hole of about 10mm, and the ventilating heat dissipating hole of the 3mm that has an appointment in the 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 in interreflection, when having electric current to flow through, because hole exists on the surface, furnace wall, induced current path changes, and at this moment, the induced current after the variation can not all be offset the source electromagnetic field, and make the part electromagnetic field, and disturb electric-control system to the shield external leaks.
To sum up analyze, guaranteeing that microwave oven has under good heat extraction, the hot gas performance prerequisite, covered a kind of shielding that the woven wire (about 70 orders) that uses is realized the hole leakage that has under adverse circumstances such as high heat, high humidity, high greasy dirt in two mother rib lateral rotundum zones, furnace wall, further the electromagnetic wave that leaks by circular hole is increased reflecting surface, reduce to electric-control system or outside radiation.
3) metal spacer assembly
Isolation design is mainly taked local shielding to the strong electromagnetic radiation source of microwave oven or extremely sensitive circuit etc., 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 the high-tension transformer secondary winding is a high-tension circuit, mainly converts civil power AC220V to about 4000V direct voltage by devices such as high-voltage capacitor, high-tension transformer, high-voltage diodes, delivers to microwave magnetron and produces the 2.45GHz electromagnetic wave;
The elementary winding of high-tension transformer is a low-voltage circuit to the circuit between the microwave oven supply power inlet 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, produce schematic diagram for microwave.The electromagnetic wave that 9 pairs of magnetrons of transformer 10 power supply, magnetron 10 produce 2.45GHz is evenly dispersed and is imported in the furnace chamber by stirring ripple device 7 after by waveguide.The mode of launched microwave can have side-emitted and bottom surface emission.Also be provided with fan 11 in the microwave oven, transformer 9 and magnetron 10 are cooled off.Wherein, survey according to field intensity meter, low-tension transformer in control circuit and crystal oscillator also are one of main radiated interference sources.
Shown in Fig. 4-a to d, the utility model is by being provided with the leakage that low-voltage circuit unit metal cage 15, microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 prevent radiation.In the utility model one preferred embodiment, low-voltage circuit unit metal cage 15, microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 are cuboid.They also can be other shapes, as long as and the assembling box adaptive.Upper end and bottom at low-voltage circuit unit metal cage 15 are provided with screw.Low-voltage circuit unit metal cage 15 assembles by two screws of upper end, bottom and the assembling box of low-voltage circuit unit 17, and low-voltage circuit unit metal cage 15 is covered outside the low-voltage circuit unit 17.Four sides at microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 are provided with screw.Screw by four sides assembles with the assembling box of microwave transmitter unit 13 and high-tension circuit unit 16 respectively, and microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 are covered respectively outside microwave transmitter unit 13 and the high-tension circuit unit 16.The material of low-voltage circuit unit metal cage 15, microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 is galvanized steel plain sheets, and this material conductance height has good electromagnet shield effect.This low-voltage circuit unit metal cage 15, microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 and the slit that the assembling box contacts need not the special processing mode, only need the metal surface contact to get final product, and reach good shield effectiveness.The thickness of this low-voltage circuit unit metal cage 15, microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 is 0.8mm, and this thickness can reach good shield effectiveness on the basis of saving material.Respectively the electromagnetic wave that devices such as the crystal oscillator in the low-voltage circuit unit 17, relay, microwave transmitter unit 13 and high-tension circuit unit 16 produce is shielded by low-voltage circuit unit metal cage 15, microwave transmitter unit metal cage 21 and high-tension circuit unit metal cage 20 on the one hand; On the other hand, the utility model is at low-voltage circuit unit 17(microcomputer control unit) by using low-voltage circuit unit metal cage 15, pass through to use high-tension circuit unit metal cage 20 at high-tension circuit unit 16, prevented the high-tension circuit unit 16(transformer parts that boost) to the interference of low-voltage circuit unit 17, and prevent that microwave emission transmission channel 18 and microwave from stirring ripple device 7 etc. and dispersing the interference of frequency electromagnetic waves to low-voltage circuit unit 17, reduced difficulty to the shielding of micro-wave oven casing slit.
4) metal divider wall
As shown in Figure 5.The utility model is according to the microwave oven existing structure, design metal divider wall 19 and by screw or copper-foil conducting electricity the microwave that (paste, fixing) do not hold in microwave emission transmission channel 18 is installed and is stirred ripple device 7 bottoms, can eliminate metal divider wall 19 and stir the slit that ripple device 7 contacts with microwave.These metal divider wall 19 edges form bending, make itself and microwave stir ripple device 7 bottoms overlap joint, so that radiation proof better.The material of this metal divider wall 19 is a galvanized steel plain sheet, and this material conductance height 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.When microwave oven is in running order, divider wall can be effectively passes passage 18 and microwave with the microwave emission and stirs the frequency electromagnetic waves that ripple device 7 dispersed and shield and reflection loss, frequency electromagnetic waves is suppressed at divider wall inside, prevents that frequency electromagnetic waves from producing interference to low-voltage circuit unit, high-tension circuit unit.The utility model has reduced the difficulty to micro-wave oven casing slit shielding, suppresses and 90% frequency electromagnetic waves that reduced microwave oven is penetrated to leaking, thereby has reached the purpose of anti-electromagnetic leakage.
Let out the instrument measurement result according to the microwave survey and analyze (microwave leakage＜0.2W/m
2), this measure has reduced the radiated interference source to the interference of extremely sensitive circuit or suppress electromagnetic radiation to external leakage from system in its entirety.
Claims (7)
1. microwave oven electromagnetic leakage restraining device, it is characterized in that this device comprises casing slit shield member, casing hole shielded metal silk screen, microwave transmitter unit metal cage (21), high-tension circuit unit metal cage (20), low-voltage circuit unit metal cage (15) and metal divider wall (19); Wherein:
Casing slit shield member is reed (1), and reed (1) is installed on microwave oven main body (2) fire door edge (4) two conducting surfaces, microwave oven body rear (3) edge two conducting surfaces and microwave oven bottom (6) left and right sides conducting surface, the left and right sides, microwave oven main body (2) fire door edge (4) conducting surface, microwave oven body rear (3) left and right sides, edge conducting surface up and down up and down respectively;
Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundum zones, electromagnetic oven furnace wall;
Microwave transmitter unit metal cage (21) is by box-packed the joining of assembling of four screws and the microwave transmitter unit (13) of four sides;
High-tension circuit unit metal cage (20) assembles by four screws of four sides and the assembling box of high-tension circuit unit (16);
Low-voltage circuit unit metal cage (15) assembles by two screws of upper end, bottom and the assembling box of low-voltage circuit unit (17);
Metal divider wall (19) is arranged at the terminal microwave of microwave emission transmission channel (18) and stirs ripple device (7) bottom.
2. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: when microwave oven back cover and main body assembling, microwave oven back cover inboard is crimped on the reed (1) on each conducting surface of microwave oven main body (2).
3. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: reed (1) comprises monolateral zigzag beryllium copper reed, bilateral zigzag beryllium copper reed and rectangle beryllium copper reed.
4. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: the thickness of described microwave transmitter unit metal cage (21) is 0.8mm.
5. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: the thickness of described high-tension circuit unit metal cage (20) is 0.8mm.
6. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: the thickness of described low-voltage circuit unit metal cage (15) is 0.8mm.
7. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: described metal divider wall (19) edge forms bending, and a face of metal divider wall (19) stirs ripple device (7) bottom with microwave and overlaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023997 CN203086772U (en) | 2013-01-16 | 2013-01-16 | Microwave oven electromagnetic leakage suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023997 CN203086772U (en) | 2013-01-16 | 2013-01-16 | Microwave oven electromagnetic leakage suppression device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086772U true CN203086772U (en) | 2013-07-24 |
Family
ID=48832569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320023997 Expired - Lifetime CN203086772U (en) | 2013-01-16 | 2013-01-16 | Microwave oven electromagnetic leakage suppression device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203086772U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110139416A (en) * | 2019-06-14 | 2019-08-16 | 深圳市博威射频科技有限公司 | A kind of micro-wave oven shielding door |
-
2013
- 2013-01-16 CN CN 201320023997 patent/CN203086772U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110139416A (en) * | 2019-06-14 | 2019-08-16 | 深圳市博威射频科技有限公司 | A kind of micro-wave oven shielding door |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |