RU2178725C2 - Filtering device - Google Patents

Abstract

FIELD: screen filters for removal of mechanical contaminants from liquids and gases. SUBSTANCE: filtering device has cylindrical housing, screen-type filtering member placed inside housing, contaminants discharge branch pipe and recovery unit composed of bypass pipeline and locking members for reversing filtrate flow through filtering member. Screen-type web of filtering member is placed on rigid pyramid- shaped carcass so that its convexity direction may be changed, when filtrate feeding direction is reversed. Filtering device has first and second pressure sensors arranged at cylindrical housing inlet and outlet ends. Outputs of sensors are respectively connected to first and second inputs of recovery control unit equipped with filtering member contamination indicator. Filtering device is further equipped with locking members adapted for reversing filtrate flow through filtering member and provided with drives whose inputs are connected to related outputs of recovery control unit. EFFECT: simplified construction and improved recovery quality. 2 cl, 1 dwg

Description

 The invention relates to the field of filtering, namely, strainers, and may find application in the purification of liquids and gases from mechanical impurities.

 A well-known pipeline filter containing a housing in the form of a pipe section, a filtering element in the form of a mesh cone, a washing device and a pollution discharge pipe located on the shaft (see ed. Certificate of the USSR 1787488, class B 01 D 35/02, 1993).

 The main disadvantage of this filter is its low reliability due to the complexity of the design and the presence of rotating elements.

 Closest to the claimed one is a filtering device containing a housing, a filtering element installed in it from an elastic filtering material, a regeneration unit for bending the filtering element under the action of the wash flow, and a nozzle for removing contaminants (see ed. St. USSR 1375286, cl. B 01 D 29/66, 1988).

 The disadvantage of this known device is the complexity and unreliability due to the introduction of wire strings, which also limit the amplitude of the deflection of the filter mesh, which reduces the degree of regeneration of the filter device and, as a consequence, the filtration rate.

 The problem solved by the invention is to improve the operational characteristics of the filter device by increasing the efficiency of the regeneration of the filter element.

 To solve this problem, in a filter device containing a housing, a mesh filter element made of flexible material installed in it, a regeneration unit and a nozzle for removing contaminants, the housing is cylindrical, the filter element has the form of a pyramid equipped with a rigid frame, each face of which is a convex membrane, the regeneration unit is equipped with a bypass pipe, shut-off elements for reversing the filtrate flow through the filter element, installed at the inlet and outlet of the cylinder one housing the first and second pressure gauges, whose outputs are connected respectively to the first and second regeneration control units, and a device for indicating clogging of the filter element, wherein the locking elements are equipped for reversing the flow actuators whose inputs are connected to respective outputs of the control unit. In this case, the filter device housing is made detachable.

 The drawing schematically shows the claimed device.

 The device comprises a cylindrical housing 1, a mesh filter element 2 installed therein, a regeneration unit comprising a bypass pipe 3 and shut-off elements 4, 5, 6, 7, 8 for reversing the filter flow through the filter element, a pipe 9 for removing impurities, the first 10 and the second 11 pressure sensors, the regeneration control unit 12, the actuators 13, 14, 15, 16, 17 of the shut-off elements for reversing the filter flow through the filter element, the device 18 for indicating the contamination of the filter element.

 The housing 1 can be made detachable, for example, using connecting flanges that provide access to the filter element for maintenance or replacement.

 The filter element 2 can be made in the form of equipped with a rigid, for example, a metal frame in the form of a pyramid, each face of which is a convex membrane of mesh fabric, for example, metal or non-woven.

 As locking elements 4, 5, 6, 7, 8 pressure sensors 10, 11, actuators 13, 14, 15, 16, 17, well-known technical solutions can be used.

 The regeneration control unit 12 can be performed, for example, on the basis of a known electronic subtractor that determines the difference in the readings of the pressure sensors 10, 11.

 The device 18 for indicating the contamination of the filter element can be made, for example, in the form of an electronic digital display depending on the pressure difference of the sensors 10, 11, showing the value of the measured parameter. This display may be located on the front panel of the regeneration control unit 12.

 The filtering device operates as follows.

 In the filtering mode, the locking elements 4, 7 are open, and 5, 6, 8 are closed. The filtrate passes through the filter element 2 and sets the mesh cloth on its faces and on the top of the truncated pyramid with a bulge in the direction of flow. In this case, the filtered particles settle on the concave part of the mesh web.

 When the device is in the regeneration mode, the locking elements 5, 6, 8 open, and 4, 7 - close. The filtrate begins to flow to the back of the filter element and changes the direction of convexity of the mesh web. As a result of the bending of the mesh web, the layer of filtered impurities is mechanically destroyed and they are removed by the filtrate stream through the nozzle 9 to remove impurities, which significantly improves the quality of the regeneration of the filter element.

 If necessary, depending on the physical properties of the filtrate and impurities in it, the regeneration cycle can be carried out more than once.

 The readings of the device 18 for indicating the contamination of the filter element correspond to the pressure difference at the inlet and outlet of the filter device and allow us to judge the degree of contamination of the filter element. These indications allow you to make timely decisions about the transition to the regeneration mode when the filter device is in manual control of the locking elements.

 The described filtering device can also operate in automatic mode. In this case, the regeneration control unit 12 constantly monitors the readings of the pressure sensors 10, 11, and when the difference of these readings reaches a predetermined value, a command will be issued to turn on the actuators 13, 14, 15, 16, 17, and the filter device will be put into regeneration mode. The duration of the regeneration can be set, for example, by a timer in the control unit 12, which is turned on at the time of issuing a command to turn on the drives.

Claims (2)

 1. A filter device comprising a housing, a filter element installed in it made of flexible material, a regeneration unit and a nozzle for removing contaminants, characterized in that the housing is cylindrical, the filter element has the form of a pyramid equipped with a rigid frame, each face of which is convex a mesh web membrane, the regeneration unit is equipped with a bypass pipe, shut-off elements for reversing the filtrate flow through the filter element, installed at the inlet and outlet de cylindrical body of the first and second pressure sensors, the outputs of which are connected respectively to the first and second regeneration control units and a device for indicating the contamination of the filter element, while the shut-off elements for reversing the flow are equipped with actuators whose inputs are connected to the corresponding outputs of the control unit.  2. The filtering device according to claim 1, characterized in that the housing is detachable.