SU1664366A1 - Bypass filter - Google Patents

Abstract

The invention relates to filtering, in particular, to devices for cleaning liquids, and allows to simplify the design, reduce the size and weight, ensure self-cleaning of the filter element from ferromagnetic particles due to the fact that the filter element 5 is reinforced with a ring 6 made of magnetic material, and The housing 1 opposite is installed with another magnetic ring 7, while the adjacent sides of the rings 6 and 7 face each other opposite poles, in addition, in the bore 4 are made grooves 8, the length of which is greater than the thickness of the ring 6, and the diameters the grooves 8 are larger than the inner, but smaller than the outer diameters of the ring 6. In addition, the end 9 of the housing 1 can be equipped with a sealing ring 10. Self-cleaning of the filter from ferromagnetic particles with the ring magnet 6 during the bypass is due to the fact that when moving it upwards on the filter element 5 will be zero differential. 1 hp f-ly, 3 ill.

Description

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The invention relates to the field of filtration, namely to devices for the purification of liquids, and can be used, for example, in fuel systems. The purpose of the invention is to simplify the design, reduce the size and weight, and ensure self-cleaning of the filter element from ferromagnetic particles.

FIG. 1 shows a bypass filter, a longitudinal section; in fig. 2 - the same, during the bypass; in fig. 3 is a section A-A in FIG.

The bypass filter includes a housing 1 with an input 2 and an output 3 channels, in a cylindrical bore 4 of which a movable reinforced filter element 5 is placed. Element 5 is reinforced with a ring 6 made of magnetic material, and in case 1 a magnetic ring 7 is installed opposite the ring 6, adjacent sides of rings 6 and 7 face opposite poles to each other. Moreover, in the bore 4 there are peripheral grooves 8, the length of which is greater than the thickness H of the ring 6, and the diameters of Dn of the grooves are larger than the inner diameter DB, but less than the outer diameter meter DH ring 6 of the filter element 5.

In addition, the end 9 of the bore 4 of the housing 1 may be provided with a sealing ring 10 made of an elastic material, such as rubber. The rings 6 and 7, facing each other by opposite poles, interact with each other, form a magnetic spring, fixing the filter 5. Instead of a magnetic ring 7, a ferromagnetic ring can be placed or, instead of a magnetic ring 6, there can be a reinforcing ring. one of them can be made ferromagnetic, and the other magnetic. Further, the variant is considered when both rings 6 and 7 are magnetic, as this gives the greatest effect on their mutual attraction.

The bypass filter works as follows.

The liquid enters through the inlet channel 2 into the housing 1, and then through the filter element 5 into the slots 8 and further into the channel 3 of the outlet.

When the filtering element 5 becomes clogged (the case is considered when only ferromagnetic particles, wear products of working elements, for example, a fuel supply pump) are found in the fluid), the pressure on it increases, the pressure difference between the fluid inlet 2 and outlet 3 of the overflow filter increases, resulting in a ring 6 with filter element

5 rises, covering the flow area of the grooves 8, the differential increases and the ring 6 rises up to the stop 9 butt (or into the ring 10 if present), opening

the flow area of the grooves 8 from the bottom of the ring 6, while at the expense of the difference in diameters It minus the Dn force acts to force it to the end 9 (protruding ring 10), and at the same time the differential on the filter element 5 becomes zero, t . fluid flow stops pushing ferromagnetic wear particles to the filter

5, which means that they are due to the force of attraction of the ring 6 or 7 (in the area where there is no

5 slots 8) will settle on a magnet, ensuring the filter is cleaned from particles that have clogged it.

Subsequently, after cessation of the filtrate through the filter, the filter element 5 under the action (interaction) of rings 6 and 7 will take the initial position, and the next time the fuel supply pump is started, it will again filter the fuel. Proposed

5, the bypass filter is especially effective during periodic operations of the fuel supply pump, since during stops, in the absence of a drop on the filters 5, it will self-clean, even if

0 worked in bypass mode, i.e. unless previously self-cleaning during operation (Fig. 2). The presence of ring 10 is optional, it is necessary only to ensure a zero differential on filter 5 when operating in

5 bypass mode, and this can be ensured by good processing of the end face 9 and the end face of the ring

6. The filter element 5 may be shifted upwards relative to the axis of symmetry of the ring 6 or may have a cap or

0 any other form that would provide more efficient self-cleaning of the filter by magnetic forces with zero differential on it.

The proposed bypass filter for

5, the expense of constant self-cleaning can be small in size and, therefore, small in size and mass, especially if it works periodically, since in the absence of a bypass it is self-cleaning from ferro-magnetic particles.

The filtering element 5 can be made in the form of a metal grid or paper (in the latter case, it is necessary to provide a frame for eliminating the tear of paper), as well as, for example, ceramic.

Claims (2)

Claims 1. An overflow filter comprising a housing with inlet and outlet channels, in a cylindrical bore of which A movable reinforced filtering element, characterized in that, in order to simplify the construction, reduce the size and weight and ensure self-cleaning of the filtering element from ferromagnetic particles, the reinforcing part of the filtering element is made in the form of an annular magnet, and adjacent sides of magnets In /////////, V /////// 7 / / / / / 7 S / / //. 0 mutually inverted opposite poles, and in the bore peripheral grooves are made, the length of which is greater than the thickness of the magnetic ring of the filter element, and the diameters of the grooves are larger than the internal, but smaller than the outer diameters of the magnetic ring of the filter element. 2. A filter according to claim 1, characterized in that the end face of the bore of the housing is provided with a sealing ring. u //////////,  / 7 S / / //. d r t. ;