CN101826390A - Structure of microwave oven transformer - Google Patents
Structure of microwave oven transformer Download PDFInfo
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- CN101826390A CN101826390A CN200910068060A CN200910068060A CN101826390A CN 101826390 A CN101826390 A CN 101826390A CN 200910068060 A CN200910068060 A CN 200910068060A CN 200910068060 A CN200910068060 A CN 200910068060A CN 101826390 A CN101826390 A CN 101826390A
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- microwave oven
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- iron core
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Abstract
The invention discloses a structure of a microwave oven transformer, which is provided with metal mesh shields on two sides from which transformer windings protrude to reduce noises of a microwave oven, and belongs to stoves using microwave for heating. The structure comprises an iron core consisting of silicon steel sheets, a primary winding, a primary winding fixing support and a secondary winding, wherein on the two lateral surfaces from which iron core windings protrude, one metal mesh shield, which has the same shape and size as those of the two lateral surfaces from which the iron core windings protrude, is arranged outside each winding. Because the mesh size of the mesh shield of the structure is less than 1/4 of the wavelength, the structure ensures difficult leakage of electromagnetic waves, improves electromagnetic radiation of the transformer, reduces acting force of a magnetic line on an outer shell and reduces the vibration amplitude of the outer shell so as to obviously reduce the noises of the plane on which the microwave oven transformer is positioned and the entire microwave oven at a low frequency band.
Description
Technical field
The invention belongs to a kind of cooking stove that utilizes microwave heating, particularly relate to a kind of in the transformer windward side and lee face be provided with the metal guard, reduce the structure of the microwave oven transformer of noise of microwave oven.
Background technology
Usually, microwave oven is that a kind of microwave that utilizes magnetron to produce heats and renders to the indoor culinary art thing of culinary art, thus the device that the culinary art thing is heated rapidly.Its principle is: is made up of the polar molecule of many band positive and negative charges in the heated medium in the microwave oven (food, moisture), positive and negative charge is irregular alignment when added electric field not, add external electric field after, polar molecule will rotate to along direction of an electric field and arrange.The change of direction of an electric field impels that the direction of polar molecule is also corresponding to be changed along with rotation, under the effect of high-frequency electric field, because the medium interior molecules swings back and forth and acutely causes frictional heating, thus the culinary art delicatessen.
The transformer of prior art mainly is made up of unshakable in one's determination and two windings as shown in Figure 1.Unshakable in one's determination 1 has constituted the required magnetic circuit of electromagnetic induction.In order to reduce the caused eddy current loss of flux change, the iron core 1 of transformer will be that the silicon steel sheet of 0.35～0.5mm builds up with thickness, and profile is a smooth hexahedron.Separate with insulating varnish between the every silicon steel sheet.In two windings one with power supply be connected to elementary winding 3, be located at the bottom of iron core, two lug plates 4 of elementary winding 3 are connected with power supply respectively.Another winding that is connected with load is a secondary winding 2, is arranged on the top of iron core.Secondary winding has 3 connector lugs, be located at another side with the corresponding iron core of elementary winding connection sheet, the lug plate that is bent upwards 7 above secondary winding is connected with magnetron (not shown), below secondary winding, draw two wires 14, one is connected with high-voltage capacitance (not shown), and one is connected with magnetron (not shown).One side is the windward side in outstanding two sides of Transformer Winding, and another side is a lee face.Transformer is fixed on the base 6.
But there is a shortcoming in the micro-wave oven transformer of prior art, because the alternating magnetic field that produces during transformer work, attraction and repulsive force to adjacent micro-wave oven casing effect one alternation, formed the external excitation of and electric current same frequency, cause the shell vibration, produce the noise identical with the frequency multiplication frequency with the electric current fundamental frequency.
For in transformer when work that solves microwave oven in the prior art, produce the problem of noise, the invention provides a kind of in the transformer windward side and lee face be provided with the metal guard, reduce the structure of the microwave oven transformer of noise of microwave oven.
The present invention adopts following technology to realize:
A kind of structure of microwave oven transformer, the fixed support portion and the secondary winding that comprise iron core, elementary winding and elementary winding that silicon steel sheet is formed, in two outstanding sides of winding unshakable in one's determination, the outside of winding respectively be provided with one with this side view, big or small identical metal guard.
Four limits of wire netting or left and right, last three limits form flanging for 90 ° to the same edgewise bend of net, and interconnect.
One of them guard is provided with a corresponding hole at the securing supports of primary winding and the position of lug plate, and another guard is provided with corresponding hole in the position of transformer secondary output winding connection sheet and elementary winding.
The size of mesh is less than 5CM.
The material of making guard is the silicon steel material.
Advantage of the present invention and good effect: because guard mesh of the present invention is less than 1/4th of wavelength, make electromagnetic wave be not easy to reveal, improved the transformer electromagnetic radiation, reduced the magnetic line of force for the shell active force, the shell vibration amplitude is reduced, and then significantly reduce the noise of micro-wave oven transformer place face and whole microwave oven in low-frequency range.
Description of drawings
Fig. 1 is the stereogram of the microwave oven transformer of prior art;
Fig. 2 and Fig. 3 are the stereograms of guard of the present invention;
Fig. 4 and Fig. 5 are the stereograms that has the transformer of guard.
The main label declaration of accompanying drawing:
1. 2. secondary winding unshakable in one's determination
3. elementary winding 4. elementary winding connection sheets
5. securing supports 6. bases
7. secondary winding lug plate 8. guards
9. mesh 10. elementary winding connection film perforations
11. guard 12. elementary winding holes
13. secondary winding wiring film perforation 14. electric wires
Embodiment
In order further to understand content of the present invention, characteristics and effect, enumerate embodiment now, and conjunction with figs. is described in detail as follows:
In order to narrate conveniently, parts same as the prior art adopt identical label.
Fig. 2 to Fig. 5 is the shape of guard of the present invention and the condition diagram of assembling back transformer.
General microwave oven is made of following several parts: the main body that forms culinary art chamber body; Form the shell of main body outward appearance; Can open or close the door of culinary art chamber; Be formed on main body front one side, and be provided with the control panel of many action buttons.
One side of top in the microwave oven or culinary art chamber is provided with electric components such as magnetron, high-tension transformer, high-voltage capacitor and waveguide.Magnetron provides microwave to the culinary art chamber interior, by waveguide the microwave transmission that generates in the magnetron is carried out cooking operation to the culinary art chamber to food, or the high temperature air that will heat around heater carries out convection current/radiation and heat food, and high-tension transformer provides high voltage to magnetron.High-voltage capacitor and high-voltage diode etc. are formed a voltage doubling rectifing circuit, and anode of magnetron is powered.Also be useful on the cooling electric device in addition, and the moisture that produces in the process with cooking food and oil smoke are discharged to the fan of microwave oven outside.
In microwave oven, the effect of high-tension transformer is that the voltage with the 220V of city's power supply becomes more than the 2000V, satisfies the anode and the filament of magnetron or only supplies the anode of magnetron requirements of one's work.As shown in Figure 2, microwave oven transformer of the present invention is mainly formed with winding 2,3 and leakage field iron core (not shown) by unshakable in one's determination 1.1 silicon steel plate stacking by same size unshakable in one's determination forms, and separates with insulating varnish between all silicon steel sheets, is twining two windings of the different numbers of turn in silicon steel sheet respectively, and one connects external power source is that to connect load be secondary winding 2 to 3, one of elementary windings.Leakage field iron core (not shown) is installed between elementary winding 3 and secondary winding 2.The leakage field iron core is made up of certain thickness multi-disc silicon steel sheet.This transformer is operated under the saturated magnetic flux density, when elementary winding 2 voltages were higher than rated voltage, the magnetic flux of increase was missed by the leakage field iron core basically, not with secondary winding 2 interlinkages, the magnetic flux of secondary winding 2 does not have obvious increase, and the induced voltage of secondary winding 2 does not have obvious increase yet; Otherwise then opposite, thus play the effect of automatic adjusting anode of magnetron voltage, electric current, guaranteed the stable of voltage like this, guarantee the stable of magnetron work.
Winding uses the copper paint envelope curve to be entwined.Secondary winding 2 is arranged on unshakable in one's determination 1 top, is provided with a lug plate 7 on the top of secondary winding 2, and its underpart is drawn two electric wires 14 and joined with magnetron (not shown) and high-voltage capacitance (not shown).Elementary winding 3 is arranged on the bottom of iron core 1, from elementary winding most external and extend to its underpart a securing supports 5 is arranged, draws two lug plates 4 from securing supports 10 bottoms, joins with power supply.Transformer is fixed on the base 6.
Two sides that winding unshakable in one's determination 1 is outstanding, the outside of winding respectively be provided with one with this side view, big or small identical metal guard 8 and 11.Guard 8 and 11 is made for silicon steel, can be that the silicon steel sheet punching press is made, and also can be that the braiding of silicon steel silk forms.The metal guard is a box-shape, and four limits of wire netting form flanging for crooked 90 ° to the same side of net, and interconnect, and guard two sides that the winding of iron core is outstanding cover fully.
Wherein guard 8 is provided with a corresponding square hole 10 at the securing supports 5 of primary winding 3 and the position of lug plate 4, and guard 11 all is provided with corresponding square hole 13 and 12 in the position of transformer secondary output winding connection sheet 7 and elementary winding 3.
Guard covers both sides unshakable in one's determination, and the energising back is according to electromagnetic principle, and the size of mesh is less than four of wavelength/for the moment, electromagnetic wave just can not let out.In order to prevent electromagnetic leakage as far as possible, the size of mesh of the present invention is less than 5CM.
During installation, the method that can stick with glue agent or welding links together the iron core of guard and transformer.After the installation, two wires 14 of secondary winding below are stretched with magnetron and high-voltage capacitance from elementary winding hole 12 and are joined.
Another kind of execution mode can also be arranged, guard 11 left and right and above three limits form flangings and interconnect for crooked 90 ° to the same side of net, its lower end does not have bending still vertically downward.After guard was installed, two wires 14 of secondary winding 2 belows stretched out with magnetron and high-voltage capacitance from the below of transformer is slit between guard 11 and the base 6 and join.And guard 8 can change equally with guard 11, also can keep intact.
In load onto guard high-tension transformer when work, so cause that the vibration of microwave oven shell is very slight, reduced the noise of microwave oven because electromagnetic wave is revealed lessly significantly.
Claims (5)
1. the structure of a microwave oven transformer, the securing supports and the secondary winding that mainly comprise iron core, elementary winding and elementary winding that silicon steel sheet is formed, it is characterized in that in two outstanding sides of the winding of iron core, the outside of winding respectively be provided with one with this side view, big or small identical metal guard.
2. the structure of microwave oven transformer according to claim 1 is characterized in that the four edges of wire netting or left and right, last three limits form flanging for 90 ° to the same edgewise bend of net, and interconnects.
3. the structure of microwave oven transformer according to claim 2 also, it is characterized in that one of them guard is provided with a corresponding hole at the securing supports of primary winding and the position of lug plate, another guard is provided with corresponding hole in the position of transformer secondary output winding connection sheet and elementary winding.
4. according to the structure of the described microwave oven transformer of claim 1 to 3, the size that it is characterized in that mesh is less than 5CM.
5. the structure of microwave oven transformer according to claim 1, the material that it is characterized in that making guard is the silicon steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910068060A CN101826390A (en) | 2009-03-06 | 2009-03-06 | Structure of microwave oven transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910068060A CN101826390A (en) | 2009-03-06 | 2009-03-06 | Structure of microwave oven transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101826390A true CN101826390A (en) | 2010-09-08 |
Family
ID=42690250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910068060A Pending CN101826390A (en) | 2009-03-06 | 2009-03-06 | Structure of microwave oven transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101826390A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006423A (en) * | 2014-05-14 | 2014-08-27 | 合肥荣事达三洋电器股份有限公司 | Noise-proof mounting structure of microwave oven transformer |
| WO2017140094A1 (en) * | 2016-02-18 | 2017-08-24 | 华为技术有限公司 | Inductor, transformer and electrical device |
| CN113838647A (en) * | 2021-09-09 | 2021-12-24 | 广东美的厨房电器制造有限公司 | Transformer and household appliance |
-
2009
- 2009-03-06 CN CN200910068060A patent/CN101826390A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104006423A (en) * | 2014-05-14 | 2014-08-27 | 合肥荣事达三洋电器股份有限公司 | Noise-proof mounting structure of microwave oven transformer |
| WO2017140094A1 (en) * | 2016-02-18 | 2017-08-24 | 华为技术有限公司 | Inductor, transformer and electrical device |
| CN113838647A (en) * | 2021-09-09 | 2021-12-24 | 广东美的厨房电器制造有限公司 | Transformer and household appliance |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100908 |