Transformer for microwave oven

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

technical field [0001] The invention relates to the technical field of transformers, in particular to a transformer for a microwave oven. Background technique [0002] A microwave oven is a device that generates microwaves from an electric current and irradiates the microwaves to the surface of the object to be heated in the cavity to heat the object. As everyone knows, microwave oven is a kind of modern cooking stove that heats food with microwave. The microwave it uses is a kind of electromagnetic wave. The energy of this electromagnetic wave is not only much greater than that of ordinary radio waves, but also has special characteristics. When the microwave hits metal, it will reflect, and the metal has no way to absorb or conduct it; microwave can pass through insulation such as glass, ceramics, and plastics. Materials, but will not consume energy; and food containing water, not only can not pass through the microwave, but its energy will be absorbed. Based on these ch...

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Problems solved by technology

[0007] In daily life, when the microwave oven magnetron is working, if the household power voltage is unstable and fluctuates, an oscillating current will be formed, which will increase the current passing through the primary coil 2 and the secondary coil 3, so that the primary coil 2 and the secondary coil When the magnetic flux formed by coil 3 increases, the magnetic flux density on both sides of the primary coil 2 of the transformer is likely to be too large, causing the iron core 1 on both sides of the primary coil 2 of the transformer to form magnetic flux saturation, resulting in the formation of magnetic flux leakage, so the electromagnetic force It will interfere with the work of other electronic components in the electric control room of the microwave oven, and generate electromagnetic excitation to the metal shell of the microwave oven, which is prone to electromagnetic resonance and forms electromagnetic radiation to the outside, causing serious damage to the operation.

[0008] In addition, when the household electricity voltage is unstable and fluctuates, the heat generated by the primary coil 2 and the secondary coil 3 increases, and the above-mentioned microwave oven transformer is not easy to dissipate heat, and the temperature rises rapidly, which seriously affects the service life of the transformer and endangers microwave oven safety

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