RU2619639C1 - Filter of ultra-thin cleaning of liquids - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: ultra-thin liquid purification filter contains a filter element made in the form of a tubular cartridge made from a food grade polymer material, the latter being formed by discrete rows of aerodynamic extrusion fibers and a holder equipped with a hub for guiding the liquid inside the filter element. The holder is formed by a fitting and a back cover, connected to each other by an axis on which the filter element is placed with the possibility of fixing it with a back cover by means of a nut. The filter element is formed by two denser carcass plies and a central less dense filter layer with radially decreasing pore size from the center to the periphery.

EFFECT: improves filtration efficiency when using a filter in the field.

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Description

The invention relates to the field of separation of liquids, namely, to removable cartridge filters for cleaning raw milk from large and small mechanical impurities, as well as plastic inclusions and mucus clots resulting from animal diseases, and can be used as a mobile milk purification system.

The prior art fine filter for raw milk containing a filter element made in the form of a tubular cartridge made of food-grade polymer material formed by discrete rows of fibers obtained by aerodynamic extrusion (see patent RU 97057, class B01D 27/00, publ. 27.08. 2010). The main disadvantage of the known device is that its use requires a housing, usually built into a stationary filtration system. It is not possible to use an appropriate filter element for reverse cleaning, since the order in which the filter layers are located in it does not allow filtering a given amount of milk. The inner part of the main filter layer is quickly clogged with large and small particles, and the filtration stops.

The objective of the invention is to remedy these disadvantages. The technical result consists in providing the possibility of using the filter in the field with high filtration efficiency. The problem is solved, and the technical result is achieved by the fact that the ultrafine filter for raw milk purification, containing a filter element made in the form of a tubular cartridge made of food-grade polymer material formed by discrete rows of fibers obtained by aerodynamic extrusion, is equipped with a holder equipped with a sleeve for directing raw milk inward filter element. The holder is formed by a fitting and a back cover, interconnected by an axis on which the filter element is placed with the possibility of its fixing by the back cover with a nut. The filter element is formed by two denser frame layers and a central less dense filter layer with pore sizes decreasing radially from the center to the periphery.

In FIG. 1 shows an extrusion plant for manufacturing a filter element;

in FIG. 2 - the location of the layers of the filter element;

in FIG. 3 is a graph of porosity versus filter element diameter;

in FIG. 4 is a longitudinal section of the proposed filter with a holder;

in FIG. 5 is a longitudinal section of the proposed filter with the holder element by element.

The proposed ultrafine filter consists of a filter element 1 in the form of a rigid tubular cartridge and holder.

The filter element is formed by discrete rows of fibers obtained by aerodynamic extrusion from food grade 01030 polypropylene. The main advantages of the material used are its resistance to aggressive media, as well as the ability to stretch fibers from 0.01 to 0.02 mm thick at a melting point of 195 ° C.

The filter element 1 is made on an extrusion installation consisting of a drive 2, a screw 3, an extruder 4 with a loading compartment 5, an extrusion head 6 and an air supply channel 7, as well as a mandrel 8 and a mandrel 9 (see Fig. 1). The fiber diameter and porosity are varied by performing the following operations:

- changing the distance X between the extrusion head 6 and the mandrel 8 by moving them relative to each other (with a smooth decrease in X from 250 mm to 200, the fiber thickness increases from 0.01 mm to 0.02 mm);

- changes in the volume of polymer passed through the extruder 4 when the rotational speed n _{1 of the} screw 3 changes to 15-20% (this function can be used to a limited extent in conjunction with an increase in distance X, since the additional loads arising can lead to breakage of the screw 3);

- changes in the pressure P of the air supplied through the channel 7 to the head 6 (with increasing pressure from 0.3 to 0.35 kg / cm ^2, the fiber thickness decreases from 0.02 to 0.01 mm, this adjustment is carried out in parallel with an increase in distance X);

- changes in the rotation speed n _{2 of the} mandrel 8 (a decrease in speed increases the density of the winding layers, reducing porosity, but the variation of this parameter is limited, since heat dissipation is deteriorating);

- changes in the speed V of the lateral movement of the mandrel 8 along the Y axis (with increasing speed V, the winding density decreases, which is necessary when winding the frame layers);

- changes in the temperature of the polymer melt T ° C in the body of the extruder 4 (a change in this parameter is limited to 175-185 ° C, the fiber thickness increases from 0.01 to 0.02 mm while increasing the parameter n ₁ );

- changes in the force F of the clamp of the mandrel mandrel 9 from 0 to 7.5 kg / linear meter (in this case, the porosity decreases from 0.02 mm to 0.05 mm).

A feature of the filter element 1 is that it consists of three layers smoothly passing into each other. In FIG. 1, the boundaries between the layers are indicated by sharp, but in fact, the transitions between the layers are smooth, which reduces gaps in the milk flow and reduces the hydraulic resistance of the filter element 1, increasing its throughput.

Layer I is a carcass, it is formed by thin fibers tightly pressed against each other by a rolling mandrel, and provides strength to the inner surface of the filter element and filters out coarse particles.

Layer II is a filtering layer, it is formed by thick fibers, less dense and has a variable porosity (as the distance from the center to the periphery decreases, the pore sizes decrease and the fiber diameter increases). Layer II filters out first large and then small particles, which are partially concentrated in this layer, while allowing milk fat globules to pass through the body of the filter element. The decrease in porosity from the center to the periphery leads to the fact that the area of the zone of fine filtration of milk increases when the flow moves from inside to outside, which gives the effect of increasing the throughput of the filter element 1.

Layer III is a skeleton, it is formed by thick fibers firmly pressed against each other, which ensures the strength of the outer surface and the removal of filtered milk from the body of the filter element.

The filter element 1 is made as follows.

The first 3 rows are applied without rolling, then rolled up to the 7th row to create an inner dense layer I. Then, approximately to a diameter of 64 mm, rarefied rows of layer II are wound with a gradual thickening of the wound fiber by reducing the distance X. Then, the locking layer III is wound providing finer cleaning due to a denser arrangement of thick fibers, which are applied in 10-12 layers with simultaneous rolling.

Due to this order of placement of the layers and the change in porosity (see Fig. 2), there is the possibility of reverse filtration of milk - from the inside out. This, in turn, allows the use of filter element 1 both in a stationary milk purification system on the farm and in summer field camps using an economical holder.

The holder of the filter element is equipped with an inlet 10, directly onto which the inlet hose is put on one side, and the filter element 1 is put on the guide sleeve 11. The axis 12 is screwed into the threaded hole of the guide sleeve 11. The filter element 1 is pressed by the back cover 13, onto which has a guide sleeve 14. The back cover 13 is pressed by a nut 15, the tightening of which ensures the tightness of the filter element 1 at the ends (Fig. 4 and 5).

The proposed filter works as follows.

The filtered fluid from the hose passes through the hole in the sleeve 11 and penetrates through the walls of the filter element 1, which traps foreign particles. The withdrawal of purified milk is carried out through the filter element 1 reverse cleaning directly into the tank for collecting milk.

The formation of the filter element of the reverse cleaning and the use of a simple holder allow the proposed filter to be used not only as part of a stationary milk pipeline, but also in the field. Moreover, due to the design of the holder, the replacement of the clogged filter element 1 is faster than in stationary systems, which reduces the time for the technological process and increases labor productivity. Studies confirm the high filtration efficiency using the proposed filter.

Claims (1)

An ultrafine liquid purification filter containing a filter element made in the form of a tubular cartridge made of food-grade polymer material formed by discrete rows of fibers obtained by aerodynamic extrusion, characterized in that it is equipped with a holder consisting of an inlet fitting with a guide sleeve, an axis, a back cover with a guide sleeve and fixing nuts, the axis is placed between the guide sleeve and the back cover, a filter element is placed on the holder with the possibility of its fixing by the back cover with schyu fixing nut for watertightness, the filter element is formed by two carcass plies and a central filtering layer decreases radially from the center to the periphery of the pore size, the carcass plies are made denser than the filter layer.

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