A shaping mold for making an insulating cylinder

Abstract

The invention discloses a shaping mold for making an insulating cylinder, which is a rectangular shape formed by sequentially connecting a first base plate (1), a second base plate (2), a third base plate (3) and a fourth base plate (4). Cylinder (5); the bottom of the rectangular cylinder (5) is provided with a holding device (10) for preventing the insulating cylinder to be heat-set from slipping out and for heat circulation; the rectangular cylinder ( 5) The width of the cross-section of the inner cavity is greater than or equal to the width of the cross-section of the outer peripheral wall of the insulating cylinder with the largest size to be heat-set, and the length of the cross-section of the inner cavity of the rectangular cylinder (5) is greater than or equal to the maximum size to be heat-set The length of the cross-section of the outer peripheral wall of the insulating cylinder; the inner wall of the rectangular cylinder (5) is provided with a first thickening mechanism (6), and the inner wall of the rectangular cylinder (5) is provided with a second thickening mechanism institutions (7). The invention has the advantages of convenient production, saving shrinkage belts and short heat setting time.

Description

technical field [0001] The invention relates to a shaping mold for making an insulating cylinder. Background technique [0002] There is an insulation distance between the high and low voltage coils of the epoxy resin cast dry-type transformer, which is usually called the main airway. If the main space is too small, the insulation requirements between the high and low voltage coils cannot be met; if the main space is too large, the manufacturing cost of the transformer will be increased. Place an insulating cylinder of appropriate size (an insulating device used to insulate between the high-voltage coil and the low-voltage coil of the epoxy resin cast dry-type transformer coil) in the main channel, which can homogenize the gap between the high-voltage and low-voltage coils The field strength distribution of the transformer enhances the insulation requirements of the transformer. The shape of the epoxy resin cast dry-type transformer coil generally has three types (cross-se...

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Problems solved by technology

[0003] The insulating cylinder is generally made of PET composite polyester film insulating flexible sheet. The manufacturing process of the above three types of insulating cylinders is analyzed below. Among them, the production process of the insulating cylinder with a circular cross section is relatively simple. The PET composite polyester film The insulating flexible sheet of the film is cut according to the height and circumference of the insulating tube, rolled into a tube for lap joints, and the lap joint position is marked with a marker pen, and the inner and outer seals of the lap joints are pasted firmly with 3M insulating tape. as attached Figure 4 As shown; the cross-section is oblong and rectangular, and the production process of the insulating cylinder is relatively cumbersome. First, make a mold with the same shape, put the mold on the square shaft, and then install it on the winding machine. The PET composite polyester film insulating flexible sheet is sleeved. On the mould, the PET composite polyester film insulating flexible sheet is fixed on the mould, as attached Figure 5 And attached Image 6 As shown, among them, the material of the mold is generally steel or cast aluminum, which is finished by mechanical finishing, and the cost is relatively high, and the shape of the insulating cylinder of different products is different, so the investment cost of one-to-one corresponding mold is huge; and then together with the mold Enter the drying room for heat setting. Since the mold made of metal materials absorbs a lot of heat, the entire heat setting time takes about 3 to 5 hours (under a certain amount). One-time use) remove the mold, and then use the same method as the round insulating tube to seal the inside and outside of the insulating tape and stick it firmly

[0004] From the above analysis, it can be known that the existing process of making insulating cylinders exists. The material of the mold is generally steel or cast aluminum. ;The heat setting time is long, and the energy consumption is large; the shrinking tape can only be used once, and a large amount of shrinking tape needs to be wasted, that is, a waste of material

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