RU1813008C - Self-cleaning filter for liquids - Google Patents

Abstract

The self-cleaning liquid filter has an input of the liquid to be cleaned into the housing where the filter element with side filter surfaces is located, in the form of a slotted nozzle parallel to it, the longitudinal plane of which is offset from the axis of this element. Due to the dynamic head and a short flow path around the filter element, the filtration process takes place with low head loss, the cleaned liquid and contaminant drain maintain sufficient pressure for subsequent use without additional pumps. 5 C.p. f-s, 4 ill.

Description

The invention relates to liquid filters, in particular to self-cleaning filters.

The purpose of the invention is to reduce energy consumption for filtration by organizing the dynamic action of a liquid with a filter element.

In FIG. 1 shows a longitudinal section through a filter with one filter element and filter disks; figure 2 is a section aa in figure 1; Fig. 3 shows a section through a filter with two filtering elements and lenticular disks; figure 4 is a section bB filter in Fig.Z.

The filter housing 1 has nozzles for supplying 2 filtered fluid, a discharge 3 of purified liquid and a discharge 4 of dirt. In the filtration chamber 5, there is a filter element 6 - one, as shown in Figs. 1 and 2, or two, as shown in Figs. 3 and 4, or another quantity thereof, which is not essential for the essence of the invention. The inner cavity 7 of the filter element 6 is connected to the pipe outlet 3 of the purified liquid. Element 6 contains a pack of discs 8 with filtering side surfaces 9, between which there is a gap on the outside for access to the filtered fluid, inside - a gap for draining the filtered fluid to the outlet through the branch pipe 3. In particular, the discs 8 may have a lenticular shape as shown in FIG.

The input of the filtered liquid into the cameo 5 is made in the form of a slotted nozzle 10 mounted against the filtering element 4, and for filters with several filtering elements (Figs. 3 and 4), in the form of slotted nozzles 10 for each of the filtering elements. The length of the slit is greater than the length of the filter element 6. The nozzle 10 is set so that its longitudinal plane is offset relative to the axis of the filter element 6 with which it interacts, the nozzle 10 and the walls of the chamber 5 form a channel emanating from the nozzle, enveloping element 6.

The filter works as follows.

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The filtered fluid is supplied under pressure to the chamber 5 at a high speed, the fluid collides along a tangential path with the filter surfaces 9, which ensures both quick passage of the clean fluid into the inner cavity 7 of the element and the washing away of the contaminants separated from the fluid from these surfaces. A smooth turn of the flow by the walls of the chamber 5 around the element b increases the value of the effectively used surface 9 of the disks and ensures re-involvement in the circular flow of that part of the liquid that, during the first passage around the circumference, was not freed from pollution and did not enter the cavity 7 and from it into the nozzle drain 3. Such a repeated turnover of fluid in the chamber 5 contributes to an increase in the proportion of liquid that has been cleaned. The rest of it, saturated with pollution and not exceeding 1/4 of the total flow, leaves through branch pipe 4. Due to the intense vortex formation, pollution does not settle on the filter surfaces 9 of the disks. A short (2-3 turns) fluid path causes small pressure losses inside the filter, as a result of which both cleaned fluid from branch pipe 3 and dirt from branch pipe 4 exit with a sufficiently high pressure that allows direct directing purified liquid to the place of its use, and the contaminated liquid - and an additional, for example, centrifugal filter, for the final separation of the contaminants concentrated in this liquid,

Thus, the proposed filter provides the required purification of the liquid and separation of contaminants from it according to the filtering cycle with self-cleaning, i.e. without the need for disassembly for washing the filter surfaces, with a small value

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pressure losses in filtration and self-cleaning lines.

Claims (6)

1. A self-cleaning liquid filter, comprising a housing with nozzles for supplying filtered fluid, discharging purified liquid and removing contaminants, at least one filter element located in the filtering chamber of the housing and connected to the internal cavity with a nozzle for discharging purified liquid, characterized in that: in order to reduce energy consumption for filtration due to the organization of the dynamic action of the liquid with the filter element, the supply pipe of the filtered liquid is installed against the filter element, nen in the form of a slotted nozzle mounted parallel to the axis of the filter element, while the length of the nozzle slit is not less than the length of the filter element. 2. Filter pop. 1; characterized in that. that the filter element is made in the form of a package of disks with lateral filtering surfaces mounted with a gap to each other. 3. The filter according to claims 1 and 2, characterized in that the discs are lenticular in shape. 4. The filter according to paragraphs. 1-3, characterized in that the longitudinal plane of the slotted nozzle is offset relative to the axis of the filter element. 5. The filter according to paragraphs. 1-4, with the exception that the inner walls of the filtration chamber are coupled to the nozzle with the formation of an envelope of the filtering element of the channel. 6. The filter according to claims 1, 4, and 5, characterized in that the filter element is made with a cylindrical filter surface, which is formed parallel to the axis of the slot nozzle. FIG. I ////////////////// l Fig.Z 7 Bb