HU200285B - Cross-flow liquid filter operating under pressure - Google Patents

Abstract

A filter for liquids, having a porous filter insert 4, which is arranged in a housing 3 and is designed as a hollow rotary body, wherein a flow passage 5, which helically surrounds the filter insert and is in communication with an inlet opening 1 at one end of the housing and an outlet opening 2 at the other end of the housing, is provided for the prefilt feed between the inner wall of the housing 3 and the outer wall of the filter insert 4, and the interior of the filter insert 4, at one end, is in communication with an outlet opening 6 for the cleaning liquid. The cross section of the flow passage 5 decreases continuously from the inlet opening 1 to the outlet opening 2. <IMAGE>

Description

fluid filter, with inlet and outlet opening (1, 2), preferably cylindrical housing (3), rotary body-shaped filter housing (4) fixed in the housing, the inlet and outlet opening (1, 2, gradually decreasing in cross section) with flow control space (5).

It is an object of the invention that the flow conducting space (5) is arranged groove-like along a spiral running on the outer surface of the periphery of the filter body (4).

Description: 3 pages, 1 drawing, 1 figure

-1HU 200285 B

The present invention relates to a fluid filter operating under cross-flow pressure. Specifically sized contaminants in liquids are most commonly removed by filtration. Filters with apertures of suitable size are used for filtration. However, sooner or later, these openings will disappear from the filtered dirt and therefore the filters will usually have to be regenerated by washing.

Regeneration can be performed in batch or continuous filtration mode. In modern designs, the contaminated filter surface is rinsed during continuous filtration. for flushing, it has led to a countercurrent flow of filtered fluid or an independent flushing system fluid, possibly in the form of a compressed gaseous material, e.g. they use air.

Typical of these filters is that they operate under pressure, so they are closed. 20

HU 179 955 is known. Hungarian patent for a discontinuous cyclone filter. The operation of the cyclone filter according to the present invention, which has a cylindrical housing with a lid, a conical outlet nozzle attached to it below, an inlet and outlet nozzle on its cylindrical part and a concentrically arranged vortex tube in the cylindrical housing is based on centrifugal force. Here, the filtration is actually done in two steps. Larger pollutant particles are deposited as a result of the cyclone effect, and relatively smaller amounts of smaller particles are separated from the filter medium 35 by a filter cartridge in a vortex tube. As with other cyclones, the highly heterogeneous particle size to be separated is filtered off with inefficiency, imperfection and high energy input, at considerable losses.

DE-OS 2234528 is also known. wherein the fluid to be filtered introduced into the cylindrical filter element is filtered into two parts as a result of the filtration: the slurry leaves the device through a valve-sealed nozzle and the filtrate leaves the device through a non-sealed nozzle.

DE-OS 2030335 50 is also known. A solution according to the prior art, wherein the flow outlet is connected between the periphery of the filter body formed from the spiral-shaped strip and the bore outlet port. 55

Porous filter bodies are referred to on the one hand in DE-OS 2234528. and Szoltó Zoltán .Filtering, Technical Books, published in 1966, pp. 129-130. side.

Also known as the so-called. taper-60 filter presses (Zoltán Gyaraki:, Preparatory operations for the processing of vegetables and fruits Agricultural Publisher Bp. 1977. pp. 133-134) and the so-called. .Edco Pressure Filter (John H. H. Perry: Manual of Chemical Engineers, Technical Publisher II, Bp. 1969, p. 1660), wherein the material introduced for the purpose of fluid separation is passed through a space of decreasing flow through the filter surface.

The common disadvantage of the above solutions is that they have a low efficiency, precisely because of the rapid clogging of the filter surfaces and the need for frequent cleaning.

The so-called. disc filters, the main disadvantage of which is the difficulty of continuous filtering.

The same applies to solutions for gravity and vacuum drum filters.

With all known solutions, the filter surfaces become clogged quickly, and the filtering process is often interrupted due to the need to clean the filter surface.

Therefore, the main object of the present invention is to extend the filtration cycle so that the number and duration of purification and flushing breaks can be minimized while maintaining the efficiency and reliability of filtration.

The solution of the problem is a fluid filter operating under cross-flow pressure having a closed cylindrical housing with inlet and outlet openings, a hollow filter body fixed in the housing, a hollow flow passage having a continuously decreasing cross section through the inlet opening to the outlet opening. it is grooved on its outer surface.

In a preferred embodiment of the device according to the invention, the hollow filter body fixed in the housing is cylindrical or frustoconical. Preferably, the flow guide space is a rectangular or circular groove.

The invention will now be described by way of example only with reference to the accompanying drawings. The figure shows a sectional view of an exemplary apparatus. The apparatus has a cylindrical housing 3 with an inlet 1 and an outlet 2. The housing 3 is provided with a truncated or cylindrical filter body 4, which is hollow inside. The outer surface of the periphery of the filter body 4 has a flow-conducting space 5 having a rectangular or circular cross-section, spirally running, connected to the inlets 1 and 2 and gradually decreasing away from the inlet 1. Connected to the inner cavity of the hollow filter body 4 is an opening 6 for free flow of filtered fluid. The outlet 2 for condensed slurry can be closed by a pressure-retaining device 7.

The equipment shown operates as follows:

The fluid to be filtered enters the apparatus under pressure through the inlet 1 and is forced to flow at constant speed through a flow guide space 5 formed on the surface of the hollow filter body 4. Centrifugal force acting on solid impurities during flow

-2EN 200285 Β seeks to keep dirt away from the filter surface of the 4-hollow filter body by constantly moving it. The expediently selected flow rate also removes dirt from the filter surface of the hollow filter body 4 despite the centrifugal force field 5. The constant flow rate is maintained by the gradual reduction of the cross-section of the flow guide space 5.

Most of the fluid from the flow passage 5 flows through the hollow filter body 4 and is filtered through the free outlet 6, the other part enriched in impurities in the form of condensed slurry exits the device through a pressure-retaining structure 15 sealing the outlet 2. With the option of a counter pulse inserted into the process, the device can be easily cleaned, i.e., the solids deposited on the filter surface of the hollow filter body 4 are easily removed. 20

With the present invention, the filtration time can be extended almost indefinitely. The big advantage of our solution is its easy production, low number of parts and total lack of moving parts. 25

The apparatus of the present invention is widely applicable in industry, agriculture and in all areas where fine-grained solid impurities must be removed from liquids. Can be used eg. 30 for filtration of purified water from galvanic sludge, waste oils and wastewater, preparation of liquid fertilizers, removal of floating material from pickle broths, reduction of clogging in reverse osmotic filtration, etc.

By parallel switching of the filtration devices, the amount of filtered fluid can be varied within wide limits.

Claims (3)

PATENT CLAIMS Cross-flow fluid pressure filter having a closed cylindrical housing with an inlet and an outlet, a hollow filter body in the form of a hollow filter fixed in the housing, a flow conduit having a gradually decreasing cross-section between the inlet and outlet, characterized in that the space (5) is arranged in a groove along a spiral running on the outer surface of the periphery of the filter body (4). A prick according to claim 1, characterized in that the hollow filter body (4) fixed in the housing (3) is cylindrical or truncated. 3. The puncture according to claim 1 or 2, characterized in that the flow guide space (5) is a rectangular or circular groove. Published by the National Office for Inventions, Budapest - Responsible for publishing: Zoltán Himer, Head of Department R 4941 - KJK 90.2970.66-13-2 Alföldi Nyomda Debrecen - Chief Executive Officer: Viktor Szabó Chief Executive Officer