RU1837937C - Filter member - Google Patents

Description

The invention relates to the industrial purification of liquids or gases during the process of filtering out solid particles, in particular for filtering fuel and oils in internal combustion engines, and can be used in engineering, imperial, 1 petrochemical and other industries industries using filtering elements in the main and auxiliary production.

The goal is to increase filtration performance by reducing regeneration time.

In FIG. 1 shows a filter element of volumetric type; in FIG. 2 is a cross-sectional diagram of a filter material of a volumetric filter element.

The filter element consists of a perforated tube 1, a bottom 2, a cover with a fitting 3, filter material 4 with end stops 5 fixed to the perforated tube 1. The filter material is laid on the perforated pipe in several layers, at least three. Each subsequent layer of filter material in the form of a tubular knitted fabric has a diameter larger than the previous one, since the loops of elastomeric yarns are stretched from layer to layer, increasing the pore size, which allows to obtain a filter element

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volumetric type with variable permeability in depth.

In FIG. 2 is a cross-sectional diagram of a filter material made in the form of a tubular elastic knit fabric of a weft weave on the basis of 1 + 1 plastic, which contains soil loops 1 of elastomeric threads 2 and additional weft inextensible threads 3. For clarity, a diagram of the filter material It is presented in a somewhat stretched pattern along the loop series. In the process, the elastomeric yarns that form the soil loops are stretched in advance. This allows an extremely dense soil structure to be obtained, since in the free state the elastomeric threads in the loops are compressed. The excess additional weft inextensible thread 3 is located between the ground loops 1 of the front and wrong sides, forming pile elements 4 on both sides of the surfaces of the filter material.

The filter material for a volumetric filter element is obtained on a double-loop knit machine by knitting an elastomeric yarn under pre-tension of 3.2 - 4.5 N on the needles of both needle beds and laying an additional weft inextensible yarn between the ground loops of the front and back sides under the tension by 0.2-0.6 N.

The volumetric filter element operates as follows.

Inside the perforated tube 1 through the nozzle 3, a vacuum or overpressure is created outside the perforated tube. Under the influence of pressure drop, a process of filtering a liquid or gas proceeds. Large particles are retained during filtration in the outer layers, where soil loops of elastomeric filaments are in an extended state, and smaller particles are retained in the inner layers of filter material, where the soil loops are in a compressed state, and additional weft inextensible threads form the largest pile elements on the surface of the filter material. In order to regenerate a volumetric filter element, the filter material is removed from the perforated tube 1 and drawn into the tube, and then stretched in the radial and longitudinal directions. Ground loops made of elastomeric threads

stretched apart by sliding the pile elements formed by an additional weft inextensible thread. This allows you to increase pore size, which provides high-quality regeneration from trapped particles

with reverse flow of air or liquid. In addition, the pile elements during the filtration process in each layer of the filter material prevent soil loops from touching each other, which prevents the trapped particles from breaking during the regeneration process when the layers of filter material are pulled into one tube when moving relative to each other. This allows the regeneration process to be conducted repeatedly.

For the sake of clarity, tests were carried out using filter material, in which, as weft threads forming pile elements,

polyamide, glass and polypropylene filaments were woven during filtration of the dope to produce viscose yarns. The number of layers, filter material in the volumetric filter element was 3 layers and 8 layers.

When determining economic efficiency when using a filter material having pile elements on each side of the surface,

a volumetric filter element accepts a minimum return of R 15%.

SUMMARY OF THE INVENTION A filter element comprising a perforated tube, a three-layer filter knitted material disposed thereon and end stops fixed to the perforated tube, characterized in that, in order to increase the filtering performance by reducing the regeneration time, the layers of knitted fabric are weaved onto Eraser 1 + 1 base, where soil loops are made of elastomeric threads, and additional weft inextensible threads form pile elements with each side of the surface of the filter material.

FIG. /