CN102054565A

CN102054565A - Transformer for microwave oven

Info

Publication number: CN102054565A
Application number: CN200910071025XA
Authority: CN
Inventors: 满宏亮; 林岩; 张国勇
Original assignee: LG Electronics Tianjin Appliances Co Ltd
Current assignee: LG Electronics Tianjin Appliances Co Ltd
Priority date: 2009-10-29
Filing date: 2009-10-29
Publication date: 2011-05-11

Abstract

The invention discloses a transformer for a microwave oven. The transformer for the microwave oven comprises an iron core (1), wherein a primary coil (2) and a secondary coil (3) are arranged in the iron core (1); the primary coil (2) is positioned below the secondary coil (3); and the left side and the right side of the iron core (1) protrude towards horizontal direction to form iron core protruded parts (4). The transformer for the microwave oven greatly reduces the leakage flux of the transformer, effectively avoids excitation of an electromagnetic force of the transformer on a shell of the microwave oven and shell vibration caused by the excitation, increases the radiating area of the transformer, guarantees the temperature of the transformer to be below the safe temperature, prolongs the service life of the transformer and guarantees the using safety of the microwave oven so as to greatly enhance the product using feelings of microwave oven users, expand the market application prospect of the microwave oven and have important production practical significance.

Description

A kind of microwave oven transformer

Technical field

The present invention relates to the transformer technology field, particularly relate to a kind of microwave oven transformer.

Background technology

Microwave oven is to produce microwave by electric current, and microwave irradiation surface of heating object in the cavity is come device that article are heated.As everyone knows, microwave oven is a kind of modernization cooking kitchen range with microwave heating of food.The microwave that it adopted is a kind of electromagnetic wave.This electromagnetic energy is not only much bigger than common radio wave, but also characteristics are arranged very much, and microwave at a touch metal just reflects, and metal has no idea to absorb or conduct it at all; Microwave can pass insulating material such as glass, pottery, plastics, but can consumed energy; And contain the food of moisture, and microwave not only can not see through, and its energy can be absorbed on the contrary.Based on these characteristics, microwave oven is heat food well, has obtained utilization widely in daily life.

In general, microwave oven is divided into single function for microwave oven and multifunction microwave oven, single function for microwave oven is to adopt microwave heating, promptly be a kind ofly to seal, connect the power supply of magnetron after placed within of the food, make it produce high-frequency microwave, by waveguide high-frequency microwave is shone on the food, makes about 2,400,000,000 5 thousand ten thousand times of hydrone internal vibration in a second of food, by the frictional heat that produces between hydrone to cooking food, heating; It is the microwave oven of one that multifunction microwave oven adopts microwave heating and other mode of heatings, and common mode of heating has light wave heating and electrothermal tube heating, is also referred to as barbecue type microwave oven.

Fig. 1 is the surface structure stereogram of a kind of microwave oven of prior art.Referring to Fig. 1, microwave oven is by the furnace chamber of food container and is arranged at furnace chamber one side and is used to install and produce and the electric control chamber and the shell 1 of the various electromagnetic devices of launched microwave constitute, wherein, and the top and both sides of shell 1 formation microwave oven, the bottom surface of microwave oven is a basal disc, and its back side is dorsal plate.The front portion of described furnace chamber is by fire door 3 sealings, opening and closing fire door 3 can make furnace chamber communicate with the external world or isolate, can prevent when closing fire door 3 that microwave from leaking when culinary art, fire door 3 is provided with furnace door window 4, the right-hand member of described fire door 3 is provided with handle 2, the place ahead, electric field chamber of described fire door 3 sides is provided with panel 5, which is provided with the operation board 7 and the demonstration display window 6 for information about of operation microwave oven.

Be provided with the magnetron that is used to generate microwave in the electric control chamber of above-mentioned microwave oven, for generation microwave that magnetron is added high pressure, magnetron need be connected with high-tension transformer, by this high-tension transformer family's week piezoelectric voltage is promoted to be magnetron operation necessary high voltages.

Referring to Fig. 2, Fig. 3, Fig. 4, existing a kind of micro-wave oven transformer as shown in the figure, this micro-wave oven transformer includes iron core 1, primary coil 2 and secondary coil 3 are installed in the described iron core 1, described primary coil 2 is positioned at secondary coil 3 belows, described iron core 1 is made of side by side a plurality of E sections chips and I sections chip, described iron core 1 is used to form closed magnetic circuit, prevent that the magnetic flux that primary coil 2 and secondary coil 3 generate from taking place to leak and these two heats that coil working generated are dissipated, magnetic circuit referring to transformer shown in Fig. 4 arrow, by this magnetic circuit as can be known, because primary coil 2 and secondary coil 3 formed magnetic fluxs all pass through transformer 2 both sides, so the magnetic flux density of transformer 2 both sides is big.

In the daily life, when microwave oven magnetic is worked, if household electricity spread of voltage and fluctuating, can form oscillating current, make the electric current that passes through primary coil 2 and secondary coil 3 increase, thereby primary coil 2 and secondary coil 3 formed magnetic fluxs increase, the magnetic flux density of transformer 2 both sides is excessive easily so, cause the iron core 1 formation magnetic flux of transformer 2 both sides saturated, cause forming flux leakage, therefore electromagnetic force can be disturbed the work of other electronic units in the microwave oven electric control chamber, and the metal shell of microwave oven produced the electromagnetic excitation effect, electromagentic resonance takes place easily, and externally form electromagnetic radiation, operation causes serious.

In addition, when in family's utilization voltage instability fluctuation taking place, the heat that primary coil 2 and secondary coil 3 generate increases, above-mentioned micro-wave oven transformer is not easy heat radiation, temperature rises very fast, has had a strong impact on the useful life of transformer, injures use of microwave ovens safety.

Summary of the invention

In view of this, the purpose of this invention is to provide a kind of microwave oven transformer, it can significantly reduce the flux leakage of transformer, avoid of excitation and the caused shell vibration of the electromagnetic force of transformer effectively to microwave oven shell, increased the area of dissipation of transformer simultaneously, guarantee that transformer is below safe temperature, prolonged the useful life of transformer, guaranteed use of microwave ovens safety, thereby strengthened microwave oven user's product use experience greatly, expanded the market application foreground of microwave oven, be of great practical significance.

For this reason, the invention provides a kind of microwave oven transformer, this transformer comprises iron core 1, and primary coil 2 and secondary coil 3 are installed in the described iron core 1, described primary coil 2 is positioned at secondary coil 3 belows, and described iron core 1 left and right sides convexes to form cored jut 4 to horizontal direction.

Preferably, described iron core jut 4 and primary coil 2 corresponding settings, described iron core jut 4 be arranged on primary coil 2 corresponding iron cores 1 position on.

Preferably, described iron core jut 4 be shaped as rectangular shape, the end face of described iron core jut 4 is positioned at described primary coil 2 top face, the bottom surface of described iron core jut 4 is positioned at below, described primary coil 2 bottom surfaces.

By above technical scheme provided by the invention as seen, compared with prior art, the present invention proposes a kind of microwave oven transformer, it can significantly reduce the flux leakage of transformer, avoid of excitation and the caused shell vibration of the electromagnetic force of transformer effectively to microwave oven shell, increased the area of dissipation of transformer simultaneously, guarantee that transformer is below safe temperature, prolonged the useful life of transformer, guaranteed use of microwave ovens safety, thereby strengthened microwave oven user's product use experience greatly, expanded the market application foreground of microwave oven, be of great practical significance.

Description of drawings

Fig. 1 is the surface structure stereogram of a kind of microwave oven of prior art;

Fig. 2 is the surface structure schematic diagram of existing a kind of micro-wave oven transformer;

Fig. 3 is the vertical view of micro-wave oven transformer shown in Figure 2;

Fig. 4 is the cutaway view along the micro-wave oven transformer of A-A line shown in Figure 3;

Fig. 5 is the surface structure schematic diagram of a kind of microwave oven transformer provided by the invention;

Fig. 6 is the vertical view of micro-wave oven transformer provided by the invention shown in Figure 5;

Fig. 7 is the micro-wave oven transformer cutaway view provided by the invention along B-B line shown in Figure 6.

Embodiment

In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.

Fig. 5 is the surface structure schematic diagram of a kind of microwave oven transformer provided by the invention, and Fig. 6 is the vertical view of micro-wave oven transformer provided by the invention shown in Figure 5, and Fig. 7 is the micro-wave oven transformer cutaway view provided by the invention along B-B line shown in Figure 6.

Referring to Fig. 5 to Fig. 7, the invention provides a kind of microwave oven transformer, this transformer comprises iron core 1, and primary coil 2 and secondary coil 3 are installed in the described iron core 1, described primary coil 2 is positioned at secondary coil 3 belows;

Need to prove, described iron core 1 is made of side by side a plurality of E sections chips and I sections chip, described iron core 1 is used to form closed magnetic circuit, prevents that the magnetic flux that primary coil 2 and secondary coil 3 generate from taking place to leak and these two heats that coil working generated are dissipated.

In the present invention, bottom, described iron core 1 left and right sides convexes to form cored jut 4 to horizontal direction;

Certainly, on the specific implementation, the invention is not restricted to convex to form described iron core jut 4 to horizontal direction by bottom, iron core 1 left and right sides, can also all convex to form described iron core jut 4 by iron core 1 left and right sides face to horizontal direction, in addition, can also be that the optional position of iron core 1 left and right sides face convexes to form iron core jut 4 to horizontal direction.

In the present invention, described iron core jut 4 and primary coil 2 corresponding settings, described iron core jut 4 be arranged on primary coil 2 corresponding iron cores 1 position on.

Need to prove, as shown in Figure 7, described iron core jut 4 be shaped as rectangular shape, the end face of described iron core jut 4 is positioned at described primary coil 2 top face, the bottom surface of described iron core jut 4 is positioned at below, described primary coil 2 bottom surfaces, thereby makes that the iron core 1 of primary coil 2 both sides is thickeied, and has wideer cross-sectional area, the iron core 1 that allows primary coil 2 be thickeied surrounds, thereby the magnetic flux of primary coil 2 both sides is not easy to leak.

Need to prove, the present invention is provided with iron core jut 4 on iron core 1, thereby compare with the iron core of prior art, described iron core 1 of the present invention has increased the cross-sectional area of primary coil 2 both sides iron cores 1, it is saturated that thereby the iron core 1 of primary coil 2 both sides is not easy to form magnetic flux, therefore primary coil 2 both sides are not easy to take place flux leakage, significantly reduced the flux leakage of transformer, avoided of direct-drive effect and the caused shell vibration of the electromagnetic force of transformer effectively to microwave oven shell, reduced the electromagnetic force influence of transformer of the present invention to other electronic units in the microwave oven electric control chamber, and the noise that has reduced the formed radiation of transformer and brought;

In addition, the present invention is provided with iron core jut 4 on iron core 1, can also increase the surface area of iron core 1, and then iron core 1 and microwave oven contact area that cooling fan blows out have been increased, thereby micro-wave oven transformer of the present invention has improved cooling effectiveness greatly, guarantee that transformer below safe temperature, has prolonged the useful life of transformer.

In sum, compared with prior art, the present invention proposes a kind of microwave oven transformer, it can significantly reduce the flux leakage of transformer, avoid of excitation and the caused shell vibration of the electromagnetic force of transformer effectively to microwave oven shell, increased the area of dissipation of transformer simultaneously, guarantee that transformer is below safe temperature, prolonged the useful life of transformer, guaranteed use of microwave ovens safety, thereby strengthened microwave oven user's product use experience greatly, expanded the market application foreground of microwave oven, be of great practical significance.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims

1. microwave oven transformer, it is characterized in that, this transformer comprises iron core (1), primary coil (2) and secondary coil (3) are installed in the described iron core (1), described primary coil (2) is positioned at secondary coil (3) below, and described iron core (1) left and right sides convexes to form cored jut (4) to horizontal direction.

2. microwave oven transformer as claimed in claim 1 is characterized in that, described iron core jut (4) and the corresponding setting of primary coil (2), described iron core jut (4) be arranged on the corresponding iron core of primary coil (2) (1) position on.

3. microwave oven transformer as claimed in claim 1, it is characterized in that, described iron core jut (4) be shaped as rectangular shape, the end face of described iron core jut (4) is positioned at described primary coil (2) top face, and the bottom surface of described iron core jut (4) is positioned at below, described primary coil (2) bottom surface.