High-elastic diaphragm filter plate and preparation method thereof

Abstract

The invention provides a high-elastic diaphragm filter plate and a preparation method thereof. The diaphragm filter plate comprises a core plate, a diaphragm, a feed hole, a sealed squeezing medium cavity, and a squeezing medium hole formed in the core plate and communicated with the squeezing medium cavity. The diaphragm comprises a hard ring made of hard plastic, a diaphragm main part made of high elastic materials, and a diaphragm frame part made of hard plastic. The squeezing medium cavity is located between the diaphragm main part and the core plate, the outer surface, in the backward direction of the core plate, of the diaphragm frame part is a diaphragm sealing surface, and a filter chamber is formed in the side of the outer surface of the diaphragm main part. The compressive deformation resistance of the hard plastic is high and thus can ensure the sealing performance of the sealing surface of the diaphragm, and the service life of a diaphragm filter plate is greatly prolonged;while the high elastic material has strong deformation ability, the diaphragm main part thus has a larger pressing stroke, the high squeezing rate of the diaphragm filter plate is thus ensured, a filter cake with low water content can be obtained, and ultimately energy consumption for dewatering is greatly reduced.

Description

technical field [0001] The invention relates to a high elastic diaphragm filter plate. [0002] The invention also relates to a preparation method of the high elastic diaphragm filter plate. Background technique [0003] Filter press is a commonly used solid-liquid separation equipment, widely used in medicine, food, chemical industry, metallurgy, environmental protection and other fields. The filter mechanism in the filter press is mainly composed of multiple filter plates. The filter plates mainly include ordinary filter plates and diaphragm filter plates. The ordinary filter plates and diaphragm filter plates can be used alone or in combination after being arranged at intervals. Among them, the diaphragm filter plate is mainly composed of a core plate, a diaphragm fixed on the front and rear sides of the core plate, a closed chamber formed between the core plate and the diaphragm, a feed hole and a liquid outlet through the front and rear, and a diaphragm formed outside ...

AI Technical Summary

Problems solved by technology

[0004] At present, the diaphragm on the diaphragm filter plate is a whole piece of rubber diaphragm made of the same material, such as: a composite rubber integral diaphragm filter plate disclosed in the Chinese invention patent application specification with the publication number CN103949096A, which has a cover filter The diaphragm on the outer surface of the frame and the filter plate, the diaphragm is sealed and glued to the filter frame and the filter plate at the feed hole, and the diaphragm is a vulcanized rubber layer; another example: a kind of integral composite rubber disclosed in the Chinese invention patent application specification with the publication number CN103285639A Diaphragm filter plate, which has a rubber diaphragm fixed on both sides of the inner core plate, and the rubber diaphragm and the inner core plate are bonded and fixed; although the rubber diaphragm has good sealing performance and high elasticity, it can obtain greater compression stroke and high compression rate, but its resistance to compression deformation is poor, and the sealing surface is prone to expansion and permanent deformation after being compressed, so the service life is short, and the rubber diaphragm cannot be recycled and reused.

In addition, the diaphragm on the diaphragm filter plate can also be a whole piece of polypropylene diaphragm made of the same material, such as: the integrated polypropylene diaphragm filter plate structure disclosed in the Chinese utility model patent specification whose publication number is CN200960441Y, its It has a central liner and a polypropylene diaphragm filter, which has good compression deformation resistance, high pressing pressure, and the material can be recycled. However, the polypropylene diaphragm filter plate has many processes and many manufacturing defects; and, the polypropylene diaphragm filter The sheet has poor elasticity, thus reducing its sealing performance, and the small pressing stroke will also lead to easy tearing and damage under the condition of cavity filtration

Therefore, the diaphragms on the diaphragm filter plate in the prior art are all elastic diaphragms made of the same material, but the sealing performance of the sealing surface on the diaphragm needs to be considered when selecting the diaphragm, which will inevitably reduce the fatigue resistance of the diaphragm. Reduce the pressing stroke of the diaphragm, unable to achieve high pressing rate

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