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Preparation process of vacuum epoxy resin casting type mutual inductor

A technology of epoxy resin and preparation process, which is applied in the manufacture of inductors/transformers/magnets, inductors, transformers, etc. Increases the effect of osmotic filling and compaction

Inactive Publication Date: 2015-01-28
TIANJIN BINHAI NEW TECH ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that a large number of bubbles are generated in the pouring process, which leads to an increase in partial discharge, which urgently requires researchers to further improve this process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation process for a vacuum epoxy resin cast transformer comprises the following steps:

[0025] (1) Wind the secondary winding with a secondary numerical control winding machine on the silicon steel sheet annular iron core. After installing the copper foil layer outside the secondary winding, put on the coil skeleton, and use the numerical control on the coil skeleton to wind the secondary winding. The parallel winding machine winds the primary winding;

[0026] (2) Fully dry the wound transformer core windings and component molds, set parameters in a vacuum drying tank, set the temperature at 110°C, and dry for 10 hours;

[0027] (3) Install the dried transformer parts in the mold and move into the vacuum tank and then vacuumize for 1 hour, and the vacuum degree is controlled between 120-130Pa;

[0028] (4) Pour the plastic into the mold, control the injection pressure at 0.1MPa~0.6MPa, control the injection time at 5 minutes, and keep the pressure at 5 minute...

Embodiment 2

[0035] A preparation process for a vacuum epoxy resin cast transformer comprises the following steps:

[0036] (1) Wind the secondary winding with a secondary numerical control winding machine on the silicon steel sheet annular iron core. After installing the copper foil layer outside the secondary winding, put on the coil skeleton, and use the numerical control on the coil skeleton to wind the secondary winding. The parallel winding machine winds the primary winding;

[0037] (2) Fully dry the wound transformer core windings and component molds, set parameters in a vacuum drying tank, set the temperature at 110°C, and dry for 14 hours;

[0038] (3) Install the dried transformer parts in the mold and move into the vacuum tank and then vacuumize for 1 hour, and the vacuum degree is controlled between 120-130Pa;

[0039] (4) Pour the plastic into the mold, control the injection pressure at 0.1MPa~0.6MPa, control the injection time at 5 minutes, and keep the pressure at 5 minute...

Embodiment 3

[0046] A preparation process for a vacuum epoxy resin cast transformer comprises the following steps:

[0047](1) Wind the secondary winding with a secondary numerical control winding machine on the silicon steel sheet annular iron core. After installing the copper foil layer outside the secondary winding, put on the coil skeleton, and use the numerical control on the coil skeleton to wind the secondary winding. The parallel winding machine winds the primary winding;

[0048] (2) Fully dry the wound transformer core windings and component molds, set parameters in a vacuum drying tank, set the temperature at 80°C, and dry for 10 hours;

[0049] (3) Install the dried transformer parts in the mold and move into the vacuum tank and then vacuumize for 1 hour, and the vacuum degree is controlled between 120-130Pa;

[0050] (4) Pour the plastic into the mold, control the injection pressure at 0.1MPa~0.6MPa, control the injection time at 5 minutes, and keep the pressure at 5 minutes....

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Abstract

The invention provides a preparation process of a vacuum epoxy resin casting type mutual inductor. The preparation process comprises the following steps of (1) winding a primary winding and a secondary winding on a mutual inductor iron core; (2) fully drying a mutual inductor iron core winding and a part die; (3) mounting the dried mutual inductor part in a die, and after moving the die into a vacuum can, vacuumizing the die; (4) preheating an injection molding material, and casting the injection molding material into the die; (5) stopping and vibrating the vacuum can; (6) changing the vacuum state into a normal-pressure state; (7) taking the die out, and after performing a post curing process, opening the die. The preparation process has the beneficial effects that due to the fact that the injection molding material is preheated in advance, bubbles are prevented from being generated during product injection molding, and local discharging amount of a product is increased; due to the fact that the injection molding material in the vacuum can is vibrated by an electromagnetic vibrator, the infiltration filling property and the compaction degree of the injection molding material are greatly improved, and the electric appliance insulating property and the mechanical strength of the mutual inductor are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of transformer preparation, and in particular relates to a preparation process of a vacuum epoxy resin cast transformer. Background technique [0002] Since the advent of epoxy resin, due to its advantages of high bonding strength, low shrinkage, good chemical stability, excellent electrical insulation performance, high mechanical strength, and good processing performance, it has been widely used in national defense and military industry, high-voltage electrical appliances, machinery, light industry, etc. It is widely used in the field and is one of the important fine polymer materials. [0003] In the electrical insulation industry, epoxy resin is the main raw material for solid insulation, mainly used for transformers, solid-sealed poles and insulation products produced by casting and APG injection. At present, most resin manufacturers have added the accelerator to the epoxy resin, which is more convenien...

Claims

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Application Information

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IPC IPC(8): H01F41/00H01F38/20B29C45/14
Inventor 苗文全
Owner TIANJIN BINHAI NEW TECH ELECTRIC
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