The sealing of the liquid tank HEPA filter is one of the key factors to ensure its HEPA filtration performance. Due to the wide application of liquid tank HEPA filters in air purification, biological safety cabinets and other fields, the requirements for their sealing performance are also getting higher and higher. This article will focus on the sealing methods and technical requirements of liquid tank HEPA filters, as well as common sealing materials and sealing structures.
1. Sealing methods and technical requirements of liquid tank high-efficiency filters.
The sealing methods of liquid tank HEPA filter mainly include sealant sealing, metal circlip sealing and gasket sealing. Among them, sealant sealing is the most commonly used sealing method, mainly by applying sealant on the frame of the liquid tank high-efficiency filter, and then pasting the filter paper on the sealant to achieve the sealing effect. Metal circlip seals and gasket seals are in contact with the frame of the liquid tank HEPA filter through metal circlips or gaskets to form a tight seal.
The sealing technical requirements of liquid tank high-efficiency filters mainly include the following aspects:
1.The sealing material should have high temperature resistance, corrosion resistance, aging resistance and other properties to ensure long-term stable sealing effect.
2.The seal structure should be simple, reliable, and easy to install and maintain.
3.The sealing surface should be smooth and flat, with punctures, cracks and other defects to reduce the possibility of air leakage.
4.The sealant should be evenly applied to the frame of the liquid tank high-efficiency filter to ensure that the filter paper is firmly pasted and there are no bubbles, wrinkles and other problems.
5.The metal circlip or gasket should be in close contact with the frame of the liquid tank type HEPA filter, and there should be no loosening or displacement.
2. Common sealing materials and sealing structures.
1.Sealant.
Sealant is one of the most commonly used sealing materials for liquid tank high-efficiency filters, mainly including silicone glue, polyurethane glue, etc. Silicone glue has excellent high temperature resistance, corrosion resistance, aging resistance and other properties, while polyurethane glue has good elasticity and adhesion. When selecting a sealant, it should be based on the specific application environment and performance requirements. Common silicone adhesives are: Henkel Loctite silicone structural adhesives, etc.;Common polyurethane adhesives are: 3M Scotch-weld polyurethane adhesives, etc.
2.Metal circlips and gaskets.
Metal circlips and gaskets are also one of the commonly used sealing materials for liquid tank HEPA filters. Metal circlips are generally made of stainless steel materials with different shapes, such as "U" type circlips and "C" shaped circlips. The gasket is generally made of rubber, asbestos and other materials, which has good elasticity and sealing properties. When choosing a metal circlip or gasket, it should be customized according to the specific size and requirements of the liquid tank HEPA filter.
3.Sealed construction.
The sealing structure of the liquid tank HEPA filter mainly includes the seal of the frame and the seal between the filter paper and the frame. The frame seal is generally sealed by metal circlip or gasket in contact with the frame to form a tight seal, and the seal between the filter paper and the frame is generally pasted with sealant. In the design and manufacture of liquid tank HEPA filter, a reasonable seal structure design should be carried out according to the specific application environment and performance requirements.
In conclusion, the sealing of the liquid tank HEPA filter is one of the key factors to ensure its HEPA filtration performance. When selecting and using liquid tank high-efficiency filters, attention should be paid to the high temperature resistance, corrosion resistance, aging resistance and other properties of its sealing materials, as well as the reasonable sealing structure design to ensure long-term stable filtration effect and service life. At the same time, the sealing performance of the liquid tank HEPA filter should be checked and maintained regularly during use, and the damaged sealing material or leakage point should be repaired in time to ensure its safe and reliable operation.