RU1823021C - Process of manufacture of superconducting solenoid - Google Patents

Abstract

Usage: for the manufacture of experimental physics devices. SUMMARY OF THE INVENTION: a mica sheet is placed over the cylindrical part of the carcass along the entire diameter, then laminated strips of heat-resistant mica materials are placed along the entire perimeter of the carcass at a distance from each other or each other, the length of each of which is equal to twice the length of the cylindrical part frame and the height of the insulation layers, excess popos from the rectilinear cylindrical part of the frame in the form of whiskers bend radially on the cheeks. After winding the wire with the formation of an interlayer insulation on the cylindrical part of the wound layer of the wire, sheets of mica-plated materials are wound, the mustache of the remaining part of the strips is bent in the direction of the forming rectilinear part of the frame on the outer layers of the winding turns, while the paper strips are fixed to each other, sheets and the body turning . 4 ill. (L C

Description

The invention relates to electrical engineering.

The method will find application in the manufacture of experimental physics devices.

The purpose of the invention is to improve quality by eliminating lubricants and lowering the cost of electrical insulating materials.

This goal is achieved by placing a sheet of mica material on the cylindrical part of the carcass along the entire diameter, then along the entire perimeter of the carcass in the tangential direction, laminated strips of heat-resistant micaceous materials are placed at a distance from each other, each of which has a double length the cylindrical part of the frame and the height of the insulation layers, excess strips from the rectilinear cylindrical part of the frame in the form of whiskers are bent on the cheeks in the radial direction, after winding the wire, at transform of the interlayer insulation on the cylindrical portion of the wound wire layer of the sheet was wound slyudoplastovyh materials whiskers bent portions of the strips for the passage of the binder and, after winding of a subsequent layer of wire during the formation of the insulation body are folded

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the whiskers of the remaining part of the strips in the direction of the generatrix of the rectilinear part of the frame onto the outer layers of the winding turns, while the paper strips are fixed between each other by the sheets and the surface of the body.

Methods of using heat-resistant mica-plastic papers impregnated with aluminochromophosphate binders in electrothermics are known in science and technology (Electric heating devices based on composite resistive materials, Kiev, Institute of Materials Science Problems, Academy of Sciences of the Ukrainian SSR, 1986, P. 30).

In contrast to the proposed method, in the above methods of using heat-resistant micaceous paper impregnated with aluminochromophosphate binders, electrothermics are carried out using finished products, for example, tubular frames. Additional impregnation with polymer binders in these structures is not required.

The proposed method for manufacturing a superconducting solenoid is as follows. A rigid frame consisting of a cylindrical part and two cheeks is covered with prepared blanks in the form of sheets and strips of heat-resistant micaceous paper impregnated with aluminochromophosphate binder. Mark of paper, for example BIZHFA, 0.1 mm thick.

The cylindrical part of the frame is wrapped in a sheet on which stripe packs are placed in diameter. Packets of a submeter are placed with gaps. After that, packs of strips are wrapped in sheets and alternating in the indicated order. The number of layers is determined by the thickness required for the electrical barrier of the housing insulation. Gaps in diameter are necessary for the passage of the polymer binder during impregnation. Sheets, strips in the bag are attached to each other and to the surface of the carcass at points with an uncured binder.

The strips in the bag are laid on the cylindrical part of the carcass with the formation of a mustache on two sides, which are folded at the cheeks.

A soft unannealed superconductor is wound around the housing insulation to a predetermined number of layers of turns.

A portion of the package mustache is folded into turns to form an interlayer insulation. The whiskers of the interlayer insulation are located on the cylindrical part parallel to the rectilinear part of the strips. To reduce mica paper before folding, it is advisable to moisten the folds. J3

if necessary, interlayer isolation whiskers are wrapped in sheets. In the interlayer insulation between packets of strips, they are formed as a result of their initial arrangement on the frame.

After laying out the interlayer insulation, a superconducting current conductor is wound.

At the end of the winding of the current lead into the coil, the remaining whiskers of the strips are unbent to the last turns. The whiskers are laid in the radial direction with sheets.

On the inside of the cheeks, the whiskers are laid with sheets of mica paper in the sequence necessary to bend the mustache for interlayer insulation.

After the formation of a cabinet outer insulation, the superconducting conductor is annealed. After that, the winding frame is placed in an airtight capsule and impregnated with a polymer binder.

In the case of a frame solenoid, the frame must be made of non-magnetic material. In the case of the manufacture of a frameless solenoid, there is no requirement for the material of the process frame (removed after the manufacture of the solenoid), but such a frame must be detachable. In this case, before performing the casing insulation, the surface of the casing, which is in contact with the insulation, is coated with a release agent so that after impregnation of the winding with polymeric binders, the frame can be disassembled.

In FIG. 1 shows a diagram of a device for impregnating a solenoid with a polymer binder; in FIG. 2 - shows the frame of the coil winding with stripes and sheets of heat-resistant mica paper; in FIG. 3 is a section AA in FIG. 1; in FIG. 4 is a section BB in FIG. 2.

The superconducting solenoid 1 is placed in a sealed capsule 2 with two fittings for supplying an impregnating composition and evacuation. A body insulation is applied to the frame 3 of the superconducting solenoid, consisting of layered strips 4 and a sheet 5 of heat-resistant mica material.

The sheets are laid on the cylindrical part, and the strips are located along the perimeter of the frame in the tangential direction at a distance from each other. The length of each layered strip is equal to twice the length of the cylindrical part of the frame and the height of the insulation layers. After winding the wire 6 with the formation of interlayer 7 and external 8 insulation, the excess strips from the rectilinear cylindrical part of the frame in the form of whiskers 9 are bent on the cheeks in the radial direction. The rectilinear parts of the strips 10 are applied to the cylindrical part, and the mustache to the cheeks 11. The whiskers of the strips are bent in the direction of the forming rectilinear part of the frame and the strips themselves form channels for passing the binder, while the strips of paper are fixed to each other, sheets and the surface of the body. for example silicon is an organic resin.

The device operates as follows:

Before winding the unannealed SP conductor, a case insulation of heat-resistant mica-paper is applied to the solenoid body. The sheets of strips in the bag are fastened at points between each other and the sheets, with the frame body and coil insulation. The bonding material is a polymeric organic binder, e.g., organosilicon.

Special high-temperature processing of the superconducting current lead is carried out in a vacuum chamber at 750-800 ° C for many hours. Already at 300-400 ° С, there are no signs of a bonding (silicone-based binder), since it burns out and the thermal decomposition products are carried away from the chamber.

Vacuum high temperature processing of the SP conductor should be carried out exclusively by an oil-free pumping system).

After processing the SP solenoid conductor, the winding is placed in a sealed capsule, in which the entire winding is evacuated and impregnated. The impregnating material is pumped into the winding and penetrates through the gaps provided during the formation of the casing and interlayer insulation. The impregnating binder is then baked.

In comparison with the prototype, the proposed method for isolating the SP solenoid

allows the use of cheaper electrical insulating material. Moreover, a positive effect in the proposed method is an improvement in the quality of insulation. those. isolation contains a lot of mica.

Claims (1)

The claims g A method of manufacturing a superconducting solenoid, according to which the wire is wound on a cylindrical part of the frame between its brushes, interlayer and casing insulations are formed, heat treated and impregnated with a binder. characterized in that, in order to improve the quality by eliminating the lubricant and lowering the cost of electrical insulation materials, a sheet of lubricant-plastic material is placed on the cylindrical part of the frame along the entire diameter, then along the entire perimeter of the frame in a tangential direction at a distance from each other place laminated strips of heat-resistant mica materials, the length of each of which is equal to twice the length of the cylindrical part of the frame and the height of the insulation layers, excess strips from the rectilinear cylindrical part of the frame in the form of whiskers bend on the cheeks in the radial direction after winding the wire, with the formation of an interlayer insulation, sheets of mica-plastic materials are wound on the cylindrical part of the wound layer of wire, the whiskers of some of the strips are bent to form channels for passing the binder, and after winding the next layer of wire when forming the shell insulation the mustache of the remaining part of the strips is bent in the direction of the generatrix of the rectilinear part of the frame onto the outer layers of the winding turns, while the strips of paper are between themselves, sheets and the surface thyw cases are fixed. % $ I AM , ““ “1 .III .IM, 1,11,1 t shshshzh & Vv4 xV sNN & s Fs / g. 1 5 T FIG. 2 T and mustache bending line I NJ MRZHSDORRLP 1Ppts; .che ;; normal. posture