SU1487936A1 - Self-cleaning filter - Google Patents

Description

The invention relates to self-cleaning filters for liquids or gases and allows you to expand the area

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its application. The filter consists of a housing 1 with a lid 2 of ferromagnetic material, a filtering element having a cylinder of mesh 4, top 6 and bottom 7 of the base, installed with the possibility of axial movement, supply 19, the outlet 20 nozzles and an inverted glass 9 having a magnetic valve 13 in the bottom. When the grid 4 is contaminated due to an increase in pressure in the cavity 17, the filter element rises, is cleaned with scrapers 18, the valve 13 opens, being attracted to the cover 2, the pressure in the cavities 17 and 22 is aligned and the filter element is lowered, additionally being cleaned with scrapers 18. 1 Il.

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The invention relates to filters for cleaning liquids or gases and can be used on the suction, pressure and drain circuits.

The aim of the invention is to expand the scope of the filter.

The drawing shows a filter, a longitudinal section.

The filter includes a housing 1 with a cover 2, made of ferromagnetic material, in which the indicator device 3 is located, for example, a reed switch, a filter element that is made in the form of a cylinder 4 of filter material, for example a mesh, reinforced between the upper 6 and lower 7 bases, and installed with the possibility of vertical reciprocating movement. An inverted cup 9 mounted with a clearance of 10 to the body, having an opening 11 in the bottom 12 is connected to the top 20 of its base 6, having openings 8 for the passage of fluid. In the latter 25 a valve 13 is installed in the form of a disk made of magnetic material and stops 14. Spring 15 is attached to the bottom of the glass and the upper base.

The valve 13 is attached to the upper base 6 by means of a flexible coupling 16. Scrapers 18 are located at the outer side of the filter element 18. The filter also has a supply nozzle 19 and a discharge nozzle 20 attached to the bottom 21 along the axis of the housing, a discharge nozzle serves as a guide when moving the filter element, which has an internal cavity 22. A saddle 23 is located under the lower base 7.

The filter works as follows.

Contaminated liquid or gas

through pipe 19 and the gap 10 is served

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in the input cavity 17, passes through the cylinder 4 of the filter element, is cleaned and through the pipe 20 is removed from the filter. With allowable mesh contamination, the pressure difference in the inlet 17 and the inner 22 cavities is not- ^ 0 large and the force acting on the lower base 7 is insufficient for compressing the spring 15 and moving the filter element.

With extreme pollution of the grid 55, the pressure difference between the inlet 17 and the inner cavity 22 increases, the force acting on the lower base 7 opens the latter from the saddle 23, resulting in a sharp increase in the area of the lower base affected by the pressure difference between the inlet 17 and inner cavity 22. The force acting on the lower base increases by moving the filter element in the axial direction, compressing the spring 15. When moving, the mesh interacts with scrapers 18, which remove contaminants from it, lowering Xia by gravity to the bottom of the filter housing 1.

When the filter element approaches the extreme position, the upper part of the cup 9 acts on the stops 14 of the magnetic valve 13 and opens it. In the open state, the valve adjoins the lid 2 made of ferromagnetic material, acting on the indicator device 3, which sends a signal that the filtering element is clogged to the control panel by the hydraulic system, which includes a filter (not shown).

The open valve and the openings 8 interconnect the inlet 17 and the inner cavity 22 of the filter, directing the flow of fluid past the filter element. The pressure between the inlet 17 and the inner cavity 22 is aligned and the filter element under the action of the spring 15 is moved to its original position. In this case, the mesh once again interacts with the scrapers and is cleared.

When the filter element approaches the initial position by means of a flexible coupling 16, the valve 13 is detached from the cover 2 and adjoins the glass 9. The effect on the indicator device 3 is stopped, the signal to the control panel also stops, indicating that the filter is self-cleaning. The closed valve 13 prevents the flow of fluid from the input cavity 17 into the internal 22 past the filter element, which ensures the continuation of cleaning fluid.

During long-term operation of the filter on the bottom 21 of the housing 1 accumulate pollution, removed by scrapers 18 from the mesh of the filter element. In this case, after the next self-cleaning, the grid will not be able to take the initial position. The valve 13 does not close, the indicator device 3 is continuously fed1487936

There is a signal to the control panel about filter contamination, which indicates the need to disassemble and clean the filter.

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Claims (1)

Claim A self-cleaning filter that includes a housing with a lid made of ιθ ferromagnetic material and a bottom, a feed nozzle attached to the housing, a discharge nozzle attached to the inside of the bottom along the axis of the housing, and installed with 1 possibility of vertical reciprocating movement element made in the form of a cylinder of filter material reinforced between upper and lower bases, characterized in that in order to expand the scope of application, it is provided with an inverted cup of ferromagnetic material located with a gap to the body, attached to the upper base and having a hole in the bottom for the passage of fluid in which a valve of magnetic material is installed made in the form of a disk with stops, a spring attached to the bottom of the glass and the upper base, and scrapers installed on the outside of the filter element, while the valve is attached flexibly With a connection to the upper base and in the latter there are holes for the passage of fluid.