CN201130590Y - Special high voltage transformer for Corona-proof industry microwave equipment - Google Patents

Abstract

The utility model relates to a special high voltage transformer for anti-corona industrial microwave equipment, comprising a low voltage coil, an iron core and at least two voltage coils which are connected with each other in series according to the induction direction of the coil. A high voltage coil for the high voltage transformer in tradition is thus changed into the combination of a plurality of small coils with a constant total voltage value of the high voltage coil. The transformer has the advantages of reducing the volume of the coil producing electric corona and the possibility of breakdown of high voltage coil and prolonging the service life of transformer.

Description

Anticorona industrial microwave apparatus special high-pressure transformer

Technical field

The utility model relates to a kind of high-tension transformer, especially relates to a kind of coil component of high-tension transformer.

Background technology

Along with the continuous progress of science and technology, microwave technology is also more and more used in the production and processing, as industries such as pharmacy, food, chemical industry.As a kind of emerging technology, output is limited, unspecial in the market a kind of transformer of making at the industrial microwave industry, many industrial microwave apparatus manufacturing firm is when selecting high-tension transformer, has only the high-tension transformer of selecting household microwave oven to use, it perhaps is the volume of simple increase transformer on the basis of the transformer that the family expenses microwave oven is used, the result causes industrial microwave apparatus the phenomenon that transformer damages often to occur, and has caused a lot of unnecessary loss for production and processing and maintenance of equipment.Common faults mainly contains following two kinds:

(1) during device start, it is directly breakdown the transformer high-voltage winding often to occur, and causes the equipment cisco unity malfunction.

When the magnetron of industrial microwave apparatus is worked, need transformer that the working volts alternating current of an about 7500V of peak value is provided, promptly around the transformer high-voltage winding, can produce a highfield, and this highfield directly causes insulating material, the ambient air generation ionization of high pressure winding probably, when the intensity of ionization acquires a certain degree, the high pressure winding will be breakdown, thereby damage transformer.And in commercial power, in the electrical network 3 times, 5 inferior harmonic contents are added the abominable of operational environment, thereby have more been aggravated the breakdown possibility of transformer high-voltage winding far above civil power.

(2) after transformer worked long hours, because corona causes insulating material aging, insulating capacity descended, and finally cause product to burn, so that the life-span is very short.

During the high-tension transformer operate as normal of industrial microwave apparatus, high pressure winding output voltage is generally 2000V～2400V.The high-tension transformer that common household microwave oven is used is generally simplex winding, so just cause the turn-to-turn voltage in the winding very high, whole high pressure winding just has the high-tension electricity potential difference of a 2000V～2400V, and this high-tension electricity potential difference also can cause the generation ionization of media such as the insulating barrier of lead and air to a certain extent, " corona " phenomenon promptly occurs.Though the intensity of " corona " is very little, can't directly cause the high pressure winding breakdown, can corrode the insulating barrier of the high pressure winding conducting wire of the high-tension transformer that industrial microwave apparatus uses to a certain extent.And the high-tension transformer that industrial microwave apparatus is used is in running order for a long time, adds high temperature, harsh environmental conditions, has more aggravated the intensity of " corona " corrosion.

At above problem, part producer adopts the high pressure winding is carried out the processing method of reinforced insulation, but also can only solve the problem in (1) to a certain extent, and the problem in (2) is not well solved, and is still perplexing most industrial microwave apparatus producer.

The utility model content

Technique effect of the present utility model can overcome above-mentioned defective, and a kind of effectively pre-anticorona industrial microwave apparatus special high-pressure transformer is provided

For achieving the above object, the utility model adopts following technical scheme: it comprises low-voltage coil, iron core and high-tension coil, and high-tension coil has two at least, is connected in series each other according to the influence directivity of coil.

Each high-tension coil is wrapped up fully by soft mica sheet respectively; Between each high-tension coil and the whole mode that adopts insulating material to wrap up fully of high-tension coil insulate, insulating material wraps up high-tension coil and soft mica sheet fully.

When operating voltage is the 2000-2400V left and right sides, high-tension coil is divided into two or more, each high-tension coil is externally connected, can keep original voltage constant like this, but the electrical potential difference of each high-tension coil self reduces greatly, have only the 1/N (N is the number of high-tension coil) of original high pressure, thereby greatly reduce the corona intensity of single high-tension coil inside.Soft mica sheet wraps up high-tension coil fully, can reduce the corona intensity of single high-tension coil outside.

Owing to adopt the mode of insulating material with high-tension coil and soft mica sheet complete closed parcel, can effectively high-tension coil be hedged off from the outer world, improved the operational environment of transformer.And adopt the structure of a plurality of high-tension coil groups, and not only the voltage of single coil has reduced, and the height of whole winding is attenuation relatively also, thereby has reduced layer voltage of striding of high-tension coil, has reduced the possibility of transformer turn-to-turn short circuit.

Adopt the utility model, the high-tension coil of high-tension transformer is become now by the synthetic high-tension coil of several little coil groups by traditional one, can guarantee simultaneously that the total magnitude of voltage of high-tension coil is constant, reduce the volume of the coil that can produce corona and reduced inner with the outside corona intensity of single winding, thereby reduced the probability that high-tension coil punctures, prolonged the useful life of transformer.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is elaborated:

Fig. 1 is the schematic diagram of high-tension coil and outer wrapping layer;

Fig. 2 is a structural representation of the present utility model.

Embodiment

Referring to Fig. 1, Fig. 2, it comprises low-voltage coil 2, unshakable in one's determination 1 and high-tension coil, and high-tension coil has 3 to be respectively 31,32,33, is connected in series each other according to the influence directivity of coil.The high-tension coil of transformer is divided into 3 coils 31,32,33 according to its different voltage by a traditional coil, adopts mode that insulating material 4 wraps up fully to guarantee between each coil and coil and 1 's unshakable in one's determination insulation simultaneously.Then according to the influence directivity of coil with each coil tandem, the voltage summation of several like this coils is identical with the voltage of a traditional coil.

The utility model can not only be separated the high voltage coil that produces corona from whole big coil, carry out the special generation that prevents corona of effectively handling, thereby simultaneously also at double minimizing the number of turn of single coil reduce the relative electrical potential difference of single coil, reduced the turn-to-turn short circuit probability.Reduced to produce the volume of the coil of corona, thereby reduced the probability that high-tension coil punctures.

Each high-tension coil is wrapped up fully by soft mica sheet 5 respectively; Between each high-tension coil and the whole mode that adopts insulating material 4 to wrap up fully of high-tension coil insulate, insulating material 4 wraps up high-tension coil and soft mica sheet 5 fully.

The sampling such scheme on the one hand, is separated the high voltage coil that produces corona from whole big coil, effectively prevented the generation of corona; On the other hand,, determine practicable coil insulation distance and electric clearance, effectively contained the generation of corona according to the condition that corona produces.

Claims (3)

1. anticorona industrial microwave apparatus special high-pressure transformer, it comprises low-voltage coil, iron core and high-tension coil, it is characterized in that: high-tension coil has two at least, is connected in series each other according to the influence directivity of coil.

2. anticorona industrial microwave apparatus special high-pressure transformer according to claim 1 is characterized in that each high-tension coil is wrapped up fully by soft mica sheet respectively.

3. anticorona industrial microwave apparatus special high-pressure transformer according to claim 2, it is characterized in that between each high-tension coil and the whole mode that adopts insulating material to wrap up fully of high-tension coil insulate, insulating material wraps up high-tension coil and soft mica sheet fully.

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