Glass insulator

Abstract

The invention discloses a glass insulator used for encapsulation connection between the metal end cover and the metal conductive columns of the wiring terminal of a compressor. The glass insulator comprises the components with the weight percentage as follows: 92-94 percent of SiO2, 3-4 percent of Al2O3, 0.5-1 percent of Bi2O3, 0.5-1 percent of TiO2 and 1.5-2.5 percent of SrO, preferably, 93 percent of SiO2, 33.3 percent of Al2O3, 0.7 percent of Bi2O3, 0.8 percent of TiO2 and 2.2 percent of SrO. The glass insulator not only has favorable insulating performance and avoids flashover generated during operation, but also has low probability of generation of crackle under the long-term action of the alternating current of the metal columns, therefore an explosion hazard of the compressor is avoided, and the glass insulator is suitable for widely applied in the wiring terminal of the compressor.

Description

technical field [0001] The invention relates to a glass insulator, in particular to a glass insulator used for encapsulating a metal end cover and a metal conductive post of a compressor connection terminal. Background technique [0002] The compressor is the heart of refrigeration equipment, and the compressor terminal is a key component for the safety and service life of the compressor. The compressor terminal is mainly composed of three parts: metal end cover, metal conductive column and glass insulator. The metal conductive column is sealed with the end cover through the glass insulator, and the glass insulator plays the role of sealing and insulation. [0003] The glass insulators used in the existing compressor terminals usually use soda-lime glass insulators. The composition and weight percentage of the insulators are: SiO 2　 65~72%, Al 2 o 3 1.5~3.5%, Fe 2 o 3 0.05~0.4%, CaO 5~8%, MgO 2~4%, K 2 o 　 1~3%,Na 2 O10-15%, BaO 0-3%, this kind of insulator has a l...

AI Technical Summary

Problems solved by technology

[0003] The glass insulators used in the existing compressor terminals usually use soda-lime glass insulators. The composition and weight percentage of the insulators are: SiO 2　 65~72%, Al 2 o 3 1.5~3.5%, Fe 2 o 3 0.05~0.4%, CaO 5~8%, MgO 2~4%, K 2 o 　 1~3%,Na 2 O10-15%, BaO 0-3%, this kind of insulator has a lower melting temperature and a higher thermal expansion coefficient, excellent melting process performance and toughening performance, but there are still two defects in the work: 1. On the one hand, the surface of the glass insulator is prone to cracks and cracks under the long-term action of the alternating current of the conductive column, which greatly increases the probability of air leakage and reduces the sealing performance. When air penetrates into the compressor from the crack, it can cause compression On the other hand, this kind of glass insulator has poor insulation performance, and flashover phenomenon often occurs during operation. When the flashover degree is serious, it often leads to the explosion of the compressor.

Images