SU1660059A1 - Transformer for induction heating - Google Patents

Description

The invention relates to electrothermal. The purpose of the invention is to improve the energy performance and simplify the design. The transformer is cylindrical. a multi-turn, water-cooled primary winding 1 made of conductive tape, in particular copper, and concentric with it, for example, a single-turn water-cooled secondary winding 2. The primary winding is placed in a groove on the outside of the water cooling channel 3, molded in frame 4 of die-cast dielectric. The windings are separated by an electrically insulating layer 5. The arrangement of the winding in the groove allows the winding to be cooled.

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The invention relates to electrical engineering, mainly to electrothermal, and can be used in induction installations, for example, for surface hardening of HDTV.

The aim of the invention is to improve the energy characteristics (coefficient of mutual induction, coupling coefficient, efficiency) and simplify the design.

The drawing shows a structural diagram of the proposed transformer.

The transformer has a cylindrical, multi-turn, water-cooled primary winding 1, made of conductive tape, such as copper, and. concentrically located for it, for example, single-turn water-cooled secondary winding 2. The primary winding is placed in a groove on the outer side of the water-cooling channel 3, molded in the frame 4 of die-cast dielectric, for example, based on epoxy resin with quartz sand. The manufacture of the frame 4 and the laying of the primary winding 1 can be made by known methods. Between the windings there is an electrically insulating layer 5 of the same dielectric dielectric or in the form of a layer of insulating tape (fabric) impregnated with a dielectric dielectric. This layer can also be made in the form of an airtight casing 6. Conclusions (not shown) are performed similarly to known constructions.

The device works as follows.

When voltage is applied to the primary winding 1, the primary magnetic flux induces an emf in the secondary winding, under the influence of which a current flows through the load (not shown) in the secondary winding 2. Performing the primary winding 1 in the form of a tape and placing it on the outside of the water-cooling channel 3 brings the current-carrying layer (1, 2) closer to the width of the water-cooling channel of the primary winding 1. Electrical insulating layer 5 serves to eliminate interwinding and inter-turn breakdowns, as well as to prevent water from flowing through leaks that may occur between the frame 4 and the primary tape 1.

Improving the reliability of the electrically insulating layer 5 can be achieved by applying a layer of electrically insulating tape (fabric) and then coating the outer surface of the primary winding and the frame with a layer of die-cast dielectric before pouring the insulating layer. The implementation of the insulating layer 5 in the form of a mechanically strong hermetic shell 6, covering the primary winding and the frame 4, increases the reliability of the transformer, completely eliminating the possibility of water flow through the leakage between the tape of the primary winding 1 and the frame 4.

Performing the primary winding in the form of a conductive tape and the presence of an electrically insulating layer on it allows the current-carrying layers of the windings to be brought closer to the width of the water cooling channel of the primary winding compared to existing winding structures from the pipe, which increases the energy performance: (mutual induction coefficient, coupling coefficient between the windings and, Transformer efficiency). This reduces the consumption of non-ferrous metal, such as copper, (3-4 times) for the manufacture of the primary winding, eliminating the need for the manufacture of the primary winding in the operations of profiling, winding, intermediate annealing, full use of the copper section of the primary winding for the passage of current: except In addition, it is easy to carry out repair work by coating or casting die-casting damaged sections of the transformer.

Claims (1)

Claim Transformer for induction heating, containing a cylindrical multi-turn primary winding, a secondary winding in the form of a water-cooled cylinder covering the primary winding, frame, characterized in that, in order to improve energy performance and simplify the design, the frame is made of die-cast dielectric with grooves and a channel along the grooves, The primary winding is made in the form of a conductive tape, each of the turns of which is located in the channel opposite the corresponding groove.