CN202799247U - Microwave oven electromagnetic leakage suppressing device - Google Patents
Microwave oven electromagnetic leakage suppressing device Download PDFInfo
- Publication number
- CN202799247U CN202799247U CN 201220410616 CN201220410616U CN202799247U CN 202799247 U CN202799247 U CN 202799247U CN 201220410616 CN201220410616 CN 201220410616 CN 201220410616 U CN201220410616 U CN 201220410616U CN 202799247 U CN202799247 U CN 202799247U
- Authority
- CN
- China
- Prior art keywords
- microwave oven
- microwave
- metal
- electromagnetic
- electromagnetic leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Electric Ovens (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
The utility model relates to a microwave oven electromagnetic leakage suppressing device. The device comprises housing slit shielding parts, a housing hole shielding wire net, a metal shielding cover and a metal partition wall. The housing slit shielding parts are single-side sawtooth type beryllium copper springs. The housing hole shielding wire net is arranged on the circular hole areas on the two sides of an electromagnetic oven wall. The metal shielding cover is assembled with an assembly box of a low-voltage circuit unit through two screws on the upper end and the bottom. The metal partition wall is arranged on the bottom of a microwave stirrer on the tail end of a microwave emission transmission channel. The device provided by the utility model alleviates the microwave oven housing slit shielding difficulties, and suppresses and reduces outward leakage of high-frequency electromagnetic waves of a microwave oven by 90%. The aim of preventing electromagnetic leakage is achieved.
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 Multi 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 the approach such as housing slit, furnace chamber hole to external leakage or disturbs 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 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 the 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 only is 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 is by adopting radiation source to take isolation design, the microwave leakages such as micro-wave oven casing slit, hole are shielded and 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 scheme of this aspect has provided a kind of microwave oven electromagnetic leakage restraining device, it is characterized in that, comprises casing slit shield member, casing hole shielded metal silk screen, metal cage and metal divider wall; Wherein:
Casing slit shield member is monolateral sawtooth pattern beryllium copper reed, and described monolateral sawtooth pattern beryllium copper reed is installed on respectively up and down up and down 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 of two conducting surfaces, microwave oven body rear edge of microwave oven main body fire door edge;
Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundums zone, electromagnetic oven furnace wall;
The metal cage assembles by two screws of upper end, bottom and the assembling box of low voltage circuit unit;
The microwave that the metal divider wall is arranged at microwave emission transmission channel end stirs ripple device bottom.
Further, microwave oven back cover inboard is crimped on the monolateral sawtooth pattern beryllium copper 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 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 for radiation sources such as strong electromagnetic radiation, high low voltage circuit unit, crystal oscillators, the microwave leakage that suppresses household microwave oven for 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 the 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 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, the 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, the 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.
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 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 slit (more than about 10cm) around the housing.When the housing gap length greater than 6cm(microwave wavelength 1/2) time, produce between high voltage circuit and the 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 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, namely just have screening effectiveness.If reduce 90% of microwave radiation energy, the 20dB that namely will decay, then the slit of shield want≤6mm could satisfy the requirement of Leakage prevention.Therefore, the utility model has adopted following shielding mode.
1) casing slit screening arrangement
Shown in Fig. 1-2, 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 1 of works fine, to be installed in respectively up and down everywhere conducting surface and left and right sides six place's conducting surfaces of microwave oven main body 2 with the gum bonding method.
Wherein, up and down everywhere the monolateral sawtooth pattern beryllium copper of conducting surface reed installation site comprise: be installed on up and down two conducting surfaces of microwave oven master 2 fire door edges two conducting surfaces about in the of 4, microwave oven body rear 3 edges;
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 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 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 the casing, electromagnetic frequency are relevant with factors such as distance, hole number, if hole designs the screen effect 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 on the surface, furnace wall, because hole exists, induced current path changes, and at this moment, the induced current after the 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, 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 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 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 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 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 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, the low-tension transformer in control circuit and crystal oscillator also are one of main radiated interference sources.
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 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 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 slit 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 low voltage circuit unit of metal cage, 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 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 stir ripple device 7 bottoms by screw or copper-foil conducting electricity installation (paste, fix) at the microwave of microwave emission transmission channel 18 ends, 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, better radiation proof.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 that frequency electromagnetic waves from producing interference to low voltage circuit unit, high voltage 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 has suppressed electromagnetic radiation to external leakage from entire system.
Claims (4)
1. a microwave oven electromagnetic leakage restraining device is characterized in that, comprises casing slit shield member, casing hole shielded metal silk screen, metal cage and metal divider wall; Wherein:
Casing slit shield member is monolateral sawtooth pattern beryllium copper reed, and monolateral sawtooth pattern beryllium copper reed is installed on respectively up and down up and down two conducting surfaces, microwave oven bottom left and right sides conducting surface, microwave oven main body fire door edge left and right sides conducting surface and the left and right sides, microwave oven body rear edge conducting surface of two conducting surfaces, microwave oven body rear edge of microwave oven main body fire door edge;
Casing hole shielded metal silk screen is arranged on two mother rib lateral rotundums zone, electromagnetic oven furnace wall;
The metal cage assembles by two screws of upper end, bottom and the assembling box of low voltage circuit unit;
The microwave that the metal divider wall is arranged at microwave emission transmission channel end stirs ripple device bottom.
2. microwave oven electromagnetic leakage restraining device according to claim 1, it is characterized in that: microwave oven back cover inboard is crimped on the monolateral sawtooth pattern beryllium copper reed on each conducting surface of microwave oven main body.
3. microwave oven electromagnetic leakage restraining device according to claim 1, it is characterized in that: the thickness of described metal cage is 0.8mm.
4. microwave oven electromagnetic leakage restraining device according to claim 1 is characterized in that: described metal divider wall edge forms bending, and a face of metal divider wall stirs ripple device bottom with microwave and overlaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220410616 CN202799247U (en) | 2012-08-17 | 2012-08-17 | Microwave oven electromagnetic leakage suppressing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220410616 CN202799247U (en) | 2012-08-17 | 2012-08-17 | Microwave oven electromagnetic leakage suppressing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202799247U true CN202799247U (en) | 2013-03-13 |
Family
ID=47826412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220410616 Expired - Lifetime CN202799247U (en) | 2012-08-17 | 2012-08-17 | Microwave oven electromagnetic leakage suppressing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202799247U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843799A (en) * | 2012-08-17 | 2012-12-26 | 安方高科电磁安全技术(北京)有限公司 | Device and method for suppressing electromagnetic leakage of microwave oven |
-
2012
- 2012-08-17 CN CN 201220410616 patent/CN202799247U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843799A (en) * | 2012-08-17 | 2012-12-26 | 安方高科电磁安全技术(北京)有限公司 | Device and method for suppressing electromagnetic leakage of microwave oven |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20200344852A1 (en) | Microwave oven having door with transparent panel | |
| US8987610B2 (en) | Vent structure for electromagnetic shielding | |
| CN102843799B (en) | Device and method for suppressing electromagnetic leakage of microwave oven | |
| KR880014837A (en) | Stop Induction Equipment | |
| GB2175179A (en) | Microwave leakage shielding device for microwave-oven | |
| CN103836684B (en) | For the fire door assembly of microwave oven and the microwave oven with it | |
| KR102149316B1 (en) | Magnetron and High frequency heating apparatus | |
| CN202799247U (en) | Microwave oven electromagnetic leakage suppressing device | |
| CN203027525U (en) | Device for suppressing electromagnetic leakage of microwave oven | |
| CN203086772U (en) | Microwave oven electromagnetic leakage suppression device | |
| EP3913309B1 (en) | Refrigerator comprising a heating apparatus | |
| CN100562242C (en) | A kind of negative magnetic-inductive capacity material electromagnetic screen that can be used for microwave oven and computer | |
| CN207219294U (en) | A kind of display system screening arrangement | |
| CN210093604U (en) | Shielding door structure of microwave oven | |
| EP3902374B1 (en) | Heating device | |
| CN204404272U (en) | A kind of safety electromagnetic heater | |
| KR20220039457A (en) | Cooking appliance | |
| CN208656627U (en) | A kind of anti-electromagnetic induction interference frequency converter | |
| CN209030490U (en) | A kind of electronic component protection cabinets | |
| CN104964318B (en) | A kind of safety electromagnetic heater | |
| CN221197477U (en) | Cooking utensil | |
| CN219555185U (en) | Waveguide and microwave cooking utensil | |
| EP4340544A1 (en) | Cooking appliance | |
| CN202018865U (en) | Radiation-proof dry-type transformer case | |
| CN102384513A (en) | Protective cover of roasting pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |