CN203027525U - Device for suppressing electromagnetic leakage of microwave oven - Google Patents
Device for suppressing electromagnetic leakage of microwave oven Download PDFInfo
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- CN203027525U CN203027525U CN 201320023208 CN201320023208U CN203027525U CN 203027525 U CN203027525 U CN 203027525U CN 201320023208 CN201320023208 CN 201320023208 CN 201320023208 U CN201320023208 U CN 201320023208U CN 203027525 U CN203027525 U CN 203027525U
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- microwave oven
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Abstract
The utility model relates to a device for suppressing electromagnetic leakage of a microwave oven. The device is characterized by comprising a box gap shielding part, a box hole shielding wire mesh, a metal shielding case, a metal shielding wall and an overall shielding cover, wherein the box gap shielding part is reeds (1); the box hole shielding wire mesh is arranged in round hole areas on two sides of the wall of the microwave oven; the metal shielding case (15) is assembled with an assembling box of a low-voltage circuit unit through two screw holes in the upper end and the bottom; the metal shielding wall (19) is arranged at the bottom of a microwave stirrer (7) at the tail end of a microwave emission transmitting channel (18); and the overall shielding cover (20) is connected with the bottom end of a rear shell of the microwave oven through a movable rotating shaft (22). According to the device, the difficulty of shielding the microwave oven shell gap is lowered, and outward leakage of over 90 percent of high-frequency electromagnetic wave of the microwave oven is suppressed and reduced, so that the aim of preventing electromagnetic leakage is fulfilled.
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 of 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 furnace chamber by stirring the ripple device after by waveguide, and forms Multi reflection in the metal furnace chamber, and most of reflected wave penetrates the purpose that food reaches heat food.But, usually in the microwave oven electric-control system is producing the microwave emission process, relate to interference and coupling between the circuit such as high voltage circuit, low voltage circuit, and in microwave transmission passage process the part electromagnetic wave by approach such as housing gap, furnace chamber holes to external leakage or disturb electric-control system, 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 anti-radiation cabinet of microwave oven, 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 bar shaped air-vent to tilting on top board and backboard; Top board, base plate, backboard are with two side plates and are fixedly connected with, and door-plate and side plate are 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, the inside warpage of the outer side edges that forms groove is protruded, groove is divided into two parts that are interconnected with two choke chambers, and the 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, the user is brought inconvenience in use procedure; 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 by adopt radiation source take isolation design, to the microwave leakage shielding such as micro-wave oven casing gap, hole with improve the measure of housing conduction continuity, effectively prevent between the high-low voltage circuit unit producing coupling and disturb, thereby and the strong electromagnetic radiation source to the interference of high-low voltage circuit unit improved microwave oven fail safe, reduced microwave leakage.
The technical solution of the utility model has been to provide a kind of microwave oven electromagnetic leakage restraining device, and this device comprises casing gap shield member, casing hole shielded metal silk screen, metal cage, metal divider wall and bulk shielding cover; Wherein:
Casing gap shield member is reed, and reed is installed on respectively up and down, microwave oven main body fire door edge two conducting surfaces, microwave oven body rear edge up and down two conducting surfaces 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 rotundums zones, electromagnetic oven furnace wall;
The metal cage by upper end, bottom two screws and the assembling box of low voltage circuit unit assemble;
At the bottom of the microwave that the metal divider wall is arranged at microwave emission transmission channel end stirs the ripple device;
The bulk shielding cover comprises skeleton and is fixed on shielding cloth on skeleton, one side skeleton be provided with movable rotation-shaft, the bulk shielding cover is connected with the microwave oven shell bottom by movable rotation-shaft.
Further, microwave oven back cover inboard is crimped on the reed on each conducting surface of microwave oven main body.
Further, the thickness of described metal cage is 0.8mm.
Further, described metal divider wall edge forms bending, and face of metal divider wall and microwave stir ripple device bottom and overlap.
Further, described reed comprises monolateral beryllium copper reed, bilateral beryllium copper reed, monolateral sawtooth pattern beryllium copper reed or bilateral sawtooth pattern beryllium copper reed.
The beneficial effects of the utility model are: the utility model has been adopted isolation design for radiation sources such as strong electromagnetic radiation, high low voltage circuit unit, crystal oscillators, the microwave leakage approach such as, housing whole for microwave oven gap, hole are by shielding and improve the microwave leakage that the electromagnetic radiation braking measure such as housing conduction continuity suppresses household microwave oven, reduced the difficulty to micro-wave oven casing gap shielding, the 90% above 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 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 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 metal cage schematic diagram;
Fig. 4-b is Fig. 4-a partial enlarged drawing;
Fig. 5 is metal divider wall partial enlarged drawing;
Fig. 6 is bulk shielding cover structure schematic diagram.
Wherein: 1-reed, 2-microwave oven main body, 3-microwave oven body rear, 4-fire door edge, 5-microwave oven shell, 6-microwave oven bottom, the 7-microwave stirs the ripple device, 8-microwave oven bottom left side conducting surface, 9-transformer, 10-magnetron, the 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 emission transmission channel, 19-metal divider wall, 20-bulk shielding cover, 21-skeleton, 22-movable rotation-shaft.
Embodiment
Therefore, thus the microwave leakage that the microwave leakage approach such as the utility model is whole to microwave oven, housing gap, hole suppress household microwave oven by electromagnetic radiation braking measures such as shielding, isolation has fundamentally been realized the effect of Leakage prevention.
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 gap (approximately more than 10cm) in the housing surrounding.When the housing gap length greater than 6cm(microwave wavelength 1/2) time, produce between high voltage circuit and low voltage circuit and disturb and coupling, when common mode current or induced current flow through, impedance therebetween is larger, can produce pressure drop, and pressure drop drives the gap that becomes antenna, microwave will leak in a large number by the gap, according to the screening effectiveness theory of computation, when the housing gap length be wavelength 1/2 the time will begin to produce decay, namely just have screening effectiveness.If reduce 90% of microwave radiation energy, the 20dB that namely will decay, the gap of shield want≤6mm could satisfy the requirement of Leakage prevention.Therefore, the utility model has adopted following shielding mode.
1) casing gap screening arrangement
Casing gap shield member can be reed, can be also the parts that have with the reed similar structures, as the structure similar to reed made at the position of casing contact.The reed 1 that the shielding of casing gap is used comprises monolateral beryllium copper reed, bilateral beryllium copper reed, monolateral sawtooth pattern beryllium copper reed or bilateral sawtooth pattern beryllium copper reed.Shown in Fig. 1-a-2-b, the utility model preferably have compatible with the electrochemistry of other contact surface and can be in multiple environment the monolateral sawtooth pattern beryllium copper reed 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 the gum bonding method.
Wherein, up and down everywhere conducting surface reed 1 installation site comprise: be installed on microwave oven master 2 fire door edges two conducting surfaces, microwave oven body rear 3 up and down, edges two conducting surfaces Shang Xia 4;
Conducting surface reed 1 installation site, the left and right sides 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 reeds 1 are installed.
In sum, when microwave oven back cover and main body assembling, microwave oven back cover inboard closely is crimped on the reed 1 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 of microwave cabinet each function element generation of inside is passed through Multi 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 casing, electromagnetic frequency are relevant with factors such as distance, hole number, if the unreasonable meeting of hole design has a strong impact on the screen effect of shield.Due to microwave oven because baking function in the furnace chamber top design the about hole of 10mm, and the ventilating heat dissipating hole of the 3mm that has an appointment in furnace chamber both sides; In addition, the furnace chamber thickness of slab is 0.8mm approximately, calculates by waveguide, and its screening effectiveness is 16dB approximately, less than 20dB.When microwave is in interreflection, when having electric current to flow through on the surface, furnace wall, because hole exists, induced current path changes, and at this moment, the induced current after variation can not all be offset the source electromagnetic field, and the 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 the woven wire (approximately 70 orders) that uses is realized the hole leakage that has under the 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 strong electromagnetic radiation source to the interference of other control circuits 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 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 the 2.45GHz electromagnetic wave;
The high-tension transformer armature winding is low-voltage circuit to the circuit between the 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, 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 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 microwave oven, 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 utility model prevents the leakage of radiation by metal cage 15 is set.Metal cage 15 is not cuboid, can be also square or other shapes.Upper end and bottom at metal cage 15 are provided with screw.Metal cage 15 by upper end, bottom two screws and the assembling box of low voltage circuit unit assemble, metal cage 15 is covered outside the 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.This metal cage 15 need not the special processing mode with the gap that the assembling box contacts, and only needs the metal surface contact to get final product, and 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 that produces by devices such as the crystal oscillator in 15 pairs of metal cages low voltage circuit unit, relays on the one hand shields; On the other hand, the utility model passes through to use metal cage 15 for low voltage circuit unit (microcomputer control unit), prevented that high voltage circuit unit (transformer boost parts) is to the interference of low voltage circuit unit, and prevent that microwave emission transmission channel 18 and microwave from stirring ripple device 7 etc. and dispersing frequency electromagnetic waves to the interference of low voltage circuit unit, reduced the difficulty to micro-wave oven casing gap shielding.
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, (paste, fixing) is installed and stirs ripple device 7 bottoms at the microwave of microwave emission 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 formation bendings make itself and microwave stir ripple device 7 bottoms 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.When microwave oven is in running order, divider wall can be effectively passes passage and microwave with the microwave emission and stirs the frequency electromagnetic waves that ripple device 7 disperses and shield and reflection loss, frequency electromagnetic waves is suppressed at divider wall inside, prevents from that frequency electromagnetic waves from producing low voltage circuit unit, high voltage circuit unit to disturb.The utility model has reduced the difficulty to the shielding of micro-wave oven casing gap, suppresses and 90% frequency electromagnetic waves that reduced microwave oven is penetrated to leaking, thereby has reached the purpose of anti-electromagnetic leakage.
5) bulk shielding cover
As shown in Figure 6, be the bulk shielding cover structure schematic diagram of the utility model preferred embodiment.Bulk shielding cover 20 comprises skeleton 21 and the shielding cloth that is fixed on skeleton 21.Skeleton 21 is not only the rectangle steel wire, can be also other shapes.The shielding cloth is made by soft fabric, one side skeleton 21 be provided with movable rotation-shaft 22, bulk shielding cover 20 is connected with microwave oven back cover bottom by movable rotation-shaft 22.During use, bulk shielding cover 20 can be around the rotating shaft opening and closing, during unlatching skeleton 21 in erectility, solid line position as shown in Figure 6; When closed skeleton 21 is in level, as shown in Figure 6 dotted line position.
Survey according to microwave and let out instrument measurement result analysis (microwave leakage＜0.2W/m
2), this measure has reduced the radiated interference source to the interference of extremely sensitive circuit or has suppressed electromagnetic radiation to external leakage from entire system.
Claims (5)
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, metal divider wall and bulk shielding cover; Wherein:
Casing gap shield member is reed (1), and reed (1) is installed on respectively microwave oven main body (2) fire door edge (4) up and down two conducting surfaces, microwave oven body rear (3) edge up and down two conducting surfaces 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;
Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundums zones, electromagnetic oven furnace wall;
Metal cage (15) by upper end, bottom two screws and the assembling box of low voltage circuit unit assemble;
The microwave that metal divider wall (19) is arranged at microwave emission transmission channel (18) end stirs bottom ripple device (7);
Bulk shielding cover (20) comprises skeleton (21) and is fixed on shielding cloth on skeleton (21), skeleton (21) one side be provided with movable rotation-shaft (22), bulk shielding cover (20) is connected with microwave oven back cover bottom by movable rotation-shaft (22).
2. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: microwave oven back cover inboard is crimped on the reed on each conducting surface of microwave oven main body (2).
3. microwave oven electromagnetic leakage restraining device according to claim 1, it is characterized in that: the thickness of described metal cage (15) is 0.8mm.
4. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: described metal divider wall (19) edge forms bending, and face of metal divider wall (19) and microwave stir ripple device (7) bottom and overlap.
5. microwave oven electromagnetic leakage restraining device according to claim 1 and 2, it is characterized in that: described reed (1) comprises monolateral beryllium copper reed, bilateral beryllium copper reed, monolateral sawtooth pattern beryllium copper reed or bilateral sawtooth pattern beryllium copper reed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023208 CN203027525U (en) | 2013-01-16 | 2013-01-16 | Device for suppressing electromagnetic leakage of microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320023208 CN203027525U (en) | 2013-01-16 | 2013-01-16 | Device for suppressing electromagnetic leakage of microwave oven |
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| Publication Number | Publication Date |
|---|---|
| CN203027525U true CN203027525U (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320023208 Expired - Lifetime CN203027525U (en) | 2013-01-16 | 2013-01-16 | Device for suppressing electromagnetic leakage of microwave oven |
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| CN (1) | CN203027525U (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 201320023208 patent/CN203027525U/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: 20130626 |