Vacuum glue injection device and glue injection method of capacitor

Abstract

The invention relates to a vacuum glue injection device of a capacitor. The vacuum glue injection device is improved on the basis of the existing glue injection tank, vacuum pump, glue injection pipeand the like, namely a degassing barrel with an open opening and a closed glue supplementing tank are also arranged in the glue injection tank; the glue injection pipe extends into the glue injectiontank and then is inserted into the degassing barrel; the degassing barrel communicates with a capacitor shell through a glue conveying pipe with a glue injection valve; an air inlet and outlet valve is arranged on an air suction pipe between a vacuumizing valve and an air suction opening; the upper part of the glue supplementing tank communicates with the air suction pipe through a connecting pipe; the lower part of the glue supplementing tank communicates with the capacitor shell through a glue supplementing pipe; the air suction pipe between the air inlet and outlet valve and the vacuumizingvalve is also connected with a high-pressure air source through a pressurizing valve; and meanwhile, an air relief opening controlled by an air relief valve is also formed in the glue injection tank.The invention also discloses a glue injection method adopting the vacuum glue injection device. By adopting the vacuum glue injection device and the glue injection method, gaps and bubbles in the capacitor can be effectively eliminated, and the glue injection quality of the capacitor can be obviously improved, so that the vacuum glue injection device and the glue injection method are worthy of popularization and application.

Description

technical field [0001] The invention relates to the technical field of a capacitor manufacturing device and a manufacturing method thereof, in particular to a capacitor vacuum glue injection device and a glue injection method. Background technique [0002] With the rapid development of power technology, large-capacity, high-voltage dry-type power capacitors are more and more widely used, and the requirements for dry-type power capacitors are also getting higher and higher. The quality of the potting glue for power capacitors directly affects the performance of dry-type power capacitors. For this reason, when potting glue, it is required that the insulating glue (generally epoxy resin or polyurethane) that plays an insulating and protective role must be tightly filled in the capacitor shell, that is, the components and components of the capacitor that are tightly filled in the shell Between the insulating part and the shell, after ensuring that it is filled, it is cured. Aft...

AI Technical Summary

Problems solved by technology

[0006] Using the above-mentioned glue injection device and its glue injection method can avoid defects such as gaps and air bubbles after the capacitor glue is injected to a certain extent, but due to the saturated vapor pressure of the insulating glue itself and the micro-leakage of the delivery pump, etc., in the vacuum Bubbles are still mixed in the insulating glue in the state, and because the components in the capacitor shell are relatively tight, there will be a gap inside which the flow resistance is relatively large and the insulating glue is difficult to enter.

In addition, the wall thickness of the general capacitor shell is only 1-4mm, and there should be no large pressure difference between the inside and outside of the capacitor shell, otherwise it is easy to be flattened and bulging, so the existing vacuum glue injection device and glue injection method cannot allow the insulating glue to fully enter The above-mentioned gaps with relatively large flow resistance still need further improvement

Images