RU122585U1 - SELF-RINSING GRID FILTER - Google Patents

Abstract

A self-cleaning mesh filter containing a housing with supply and discharge pipelines, inside which a filter element is installed, containing at least two mesh sections connected in series with one another, and the size of the cells of each subsequent section is less than the size of the cells of the previous section, characterized in that the mesh sections fixed in a frame, on which at least one sealed elastic gasket is installed on the side of the fluid flow, while radial grooves are made in the frame, communicating with the longitudinal channels.

Description

The utility model relates to a device for filtering liquid and is intended for mechanical cleaning.

Known self-cleaning mesh filters made in Italy by the STC series (www.santur.ru/catalog/121), in which a mesh with a mesh size of 20 to 500 μm (selected depending on the degree of water pollution) is used as a filter element. In this case, the filter element is made of a cylindrical shape and is installed inside the pipe. One end of the filter element is hermetically closed; water is supplied to the outer part of the filter element. The water purified from mechanical suspended particles comes to the consumer through the open second end of the filter element. The removal of mechanical impurities deposited on the grid and in the sump is carried out in the drain when opening the crane mounted in the filter construction. Filter washing can be carried out simultaneously with the supply of purified water to the consumer, as The wash water flow is tangential along the outside of the strainer.

The disadvantages of the above self-cleaning mesh filter are:

1. Low quality water treatment due to the use of a single row of filter element.

2. Low quality of cleaning the mesh of the filter element, since since the washing flow passes tangentially to the surface of the filter mesh and cannot remove solid mechanical particles stuck and stuck in the filter cells.

3. When the drain valve is opened in the flushing mode, the water will not reach the consumer in full due to the pressure drop that has arisen.

4. With increasing filter performance and filtering rating due to the large ratio of the grid area and its thickness, the latter is deformed and fails.

AMIAD self-cleaning filters of the SAF series and EBS series are known (www.ecosystem.com.ua/index.php?option=com_content&view=article&id=48&Itemid=67), designed to remove suspended particles of large and medium size from the water (filtration rating from 10 up to 800 microns). As filter elements, a stamped stainless steel mesh and a braided four-layer stainless steel wire mesh are used. Filters remove dirt particles as water flows through the filter screen. The dirt particles that accumulate on the surface of the mesh create a pressure drop. At a preset differential pressure or time interval, the control unit activates a self-cleaning cycle. The cleaning process of the filter mesh is carried out using a vacuum scanner rotating in a spiral. Absorbed dirt from the surface of the mesh is discharged into the drain through a flush valve. The cleaning process lasts 20-40 seconds, the volume of flushing water is 0.025-0.28 m ³ / h per cycle (depending on the filter model, but not more than 1% of the total amount of filtered water (with a high filtration rating). water up to 400 m ³ / h (for the EBS series up to 4800 m ³ / h).

Filters of these series, despite the existing advantages, have several disadvantages:

1. The filter mesh is quickly clogged, because they are four-layer. This forces a more and longer self-cleaning cycle, which entails an increase in water and electricity consumption. With a given flow rate of washing water of about 1%, with a given capacity of 400 cubic meters per hour, it will be 4 cubic meters per hour, and more than 90 cubic meters per day.

2. High qualification of staff due to the complexity of the equipment used (vacuum and scanning devices, mechanical parts moving along the trajectory, etc.).

3. The high cost of equipment, spare parts and consumables.

Honeywell strainers are known with the HABEDO patented backwash system (http://www.honeywell-russia.ru/shop/filtry-s-obratnoj-promyvkoj), which provides quick and complete filter cleaning with a small amount of water, the process of which can be carried out manually or automatically. The filter insert consists of two parts. When the filter is in the “filtration” position, only the lower, larger element is flushed with water jets in the direction from the outside to the inside. The small upper filter element does not come into contact with unfiltered water. When the ball valve is open for backwashing, the filter insert is completely pushed down until the flow of water to the outside of the main filter element ceases. At the same time, water flows into the upper part of the filter. The water needed to clean the filter passes through the upper filter element, through the rotating impeller and the main filter element in the direction from the inside out, i.e. backwash the filter with filtered water. Through this, the upper filter element is also washed with jets coming from the impeller. The filter automatically switches to the operating position when the ball valve is closed.

The disadvantages of the filter are:

1. The presence of mechanically moving filter elements during switching to flushing and back, which reduces reliability; clogging of the working chamber and seats of the filter insert, which can lead to misalignment and jamming of the insert and a violation of the tightness and failure of the filter.

2. For each filtration rating, filter inserts with a certain mesh structure are required, and for a wide range of purifications they are forced to use multi-link filter systems.

3. The need for frequent washing of filters.

4. Low productivity due to insufficient rigidity of the filter mesh, related to the ratio of the area of the filter surface of the mesh to its thickness (determined by the filter rating).

5. The high cost of spare parts.

The closest in technical essence is a self-washing filter (RF patent No. 2159142 "Combined water treatment filter", IPC B01D 24/16, publ. 11/20/2000), containing a housing with inlet and outlet pipelines, and consisting of at least two series-connected one on the other mesh sections of the filter element, the cell size of each subsequent section being smaller than the cell size of the previous section.

The disadvantage of this filter is the bulkiness of its design, the need for a complex multi-level drainage system and low operational reliability.

The technical task of the proposed solution is aimed at ensuring increased reliability of the filter, simplifying assembly and operation.

The problem is achieved in that in a self-washing screen filter containing a housing with inlet and outlet pipes, inside which is installed a filter element containing at least two mesh sections connected in series with each other, and the cell size of each subsequent section is smaller than the cell size of the previous section , according to a utility model, the mesh sections are fixed in a frame on which at least one sealed elastic gasket is installed on the side of the fluid flow, while the frame is made of radial grooves in communication with the longitudinal channels.

The filter element contains at least two mesh sections connected in series with one another. Each section is fixed in a frame with the formation of intermediate mud chambers during assembly. The cell size of each subsequent section is smaller than the cell size of the previous section. Such a sequential installation of mesh sections increases the degree of mechanical purification of water, increases the service life of the filter and simplifies the assembly and operation of the filter. Different subtleties of water purification are provided by differentiation of section cell sizes.

Sealed elastic gasket on the side of the fluid flow acts as a tight seal and pressure valve.

Radial grooves are made in the frame of the filtering element, communicating on the one hand with the corresponding mud chambers, and on the other hand with longitudinal channels, which, in turn, act as an open valve through a sealed elastic gasket in the process of creating a reverse pressure, thereby ensuring self-washing of the filter.

The essence of the claimed technical solution is illustrated by drawings, where Figs. 1-3 show a schematic representation of a filter element with four sections with radial grooves and three sealed elastic gaskets, Fig. 4 is a cross-section of the filter element along plane AA, Fig. 5 - a schematic representation of a four-section filter element with one sealed elastic pad.

The self-washing screen filter comprises a housing with inlet and outlet pipes (not shown conventionally in FIGS. 1-4), inside which a filter element is installed. The filter element (Figs. 1-4) contains four mesh sections 1 (the sections can be metal or synthetic), the mesh size of each subsequent section being smaller than the mesh size of the previous section, and the sections during assembly form intermediate mud chambers 6. Each mesh section 1 is fixed in frame 2, on which from the side of the fluid flow there is installed at least one sealed elastic gasket 3. In frame 2, radial grooves 4 are made, communicating with longitudinal channels 5.

The device operates as follows.

Example 1. Several elastic gaskets 3 (Figs. 1-4), each of which, in the initial mode of fluid filtration, tightly closes the corresponding longitudinal channels 5, connected through radial grooves 4 to the corresponding mud chambers 6. When backpressure arises from the reverse fluid flow, in each of the mud chambers 6, through the corresponding radial grooves 4 and longitudinal channels 5, sections of the corresponding elastic gaskets 3 are sequentially bent, starting from the one that is connected to the last mud chamber Hero 6 with a high filtering rating. As the pressure equalizes in subsequent mud chambers 6, it will be enough to overcome the elastic forces created by the next elastic gasket 3 and open the valve, etc. The longitudinal channels 5 connecting one mud chamber are rationally performed concentrically uniformly through (360 / n _k ) °, where n _k is the number of channels in the chamber. The longitudinal channels 5 connecting the other mud chambers 6 are respectively shifted by 360 / (n _k · n _kk ) °, where n _kk is the number of mud chambers in the filter element. Moreover, the radii of the longitudinal channels 5 for each of the mud chambers 6 are eccentric with respect to the channels 5 of the previous and subsequent chambers and should ensure reliable operation of the elastic gaskets 3 as valves. The number of concentrically arranged longitudinal channels 5 and their diameter depends on the number of mud chambers 6 and their volume and are associated with the duration of the emptying of the mud chambers 6. The mud chambers 6 are emptied immediately after cleaning the previous finer mesh section 1 and increasing the pressure in this intermediate mud chamber to the pressure of the original countercurrent. Next is cleaning the subsequent coarser mesh, increasing the pressure in another mud chamber, emptying it through a valve, etc.

Example 2. Only one elastic pad 3 is used (FIG. 5), which in the initial state of water filtration tightly closes all longitudinal channels 5 connected through radial grooves 4 to the corresponding mud chambers 6. All radial grooves 4 are made to the same depth, and all longitudinal channels 5 connected to all mud chambers 6 are concentrically located, i.e. on one circle relative to the center of the filter evenly through f = 360 ° / (n _k · n _kk ), where f is the angle of the successive shift of the holes in the chambers; nk is the number of holes in one chamber; n _k is the number of mud chambers in the filter. With the number of holes in the chamber n _k = 4 and the number of mud chambers n _kk = 3, the angle of the shift of the holes will be f = 30 °. The intersection of the angle beam with the circle will determine the center of the corresponding longitudinal channel 5. In this embodiment, one elastic gasket 3 works as a multivalve for all longitudinal channels 5 of all mud chambers 6. In this case, the elastic gasket has high elasticity and elasticity, allowing the valve to bend and open only on given area.

Thus, our proposed design of a self-washing filter with reverse flow fluid has the following advantages:

1. Filtration of liquid from suspended particles occurs simultaneously in one filter in a wide range of filtering ratings and is determined by the technical feasibility of manufacturing filter nets (mainly in the fine mesh range).

2. The presence in the design of one filter of several grids and mud chambers with accumulation of contaminants with different ratings of suspended particles.

3. The self-washing system of the filter with the reverse fluid flow provides complete emptying of all mud chambers and high-quality cleaning of the mesh of the filtering mesh from stuck (stuck) mechanical particles due to the backward deflection of the mesh, which will ensure the specified filter performance.

4. It will provide high filter performance due to the possibility of creating a large pressure of the liquid, since the filter nets, regardless of their size and mesh, are reliably stretched and fixed within the filter.

5. Low consumption of flushing water, less than 0.1% of the filtration volume, which does not depend on the fineness of filtration, all elements of a multi-chamber filter are washed immediately with a single current of return water.

6. A short cleaning cycle, since multilayer braided nets and microfiber systems are not used, in which it is difficult to rinse and remove mechanical impurities that are stuck and accumulated inside them, and accumulated impurities in the mud chambers are automatically emptied.

7. The design of the filter is highly reliable because it does not have moving mechanical parts in its design; it is assembled from simple and reliable parts.

8. Assembly, disassembly, replacement of worn parts and prevention is carried out by a regular plumber and does not require special knowledge.

Claims (1)

A self-washing screen filter containing a housing with inlet and outlet pipes, inside which a filter element is installed, containing at least two mesh sections connected in series with each other, the mesh size of each subsequent section being smaller than the mesh size of the previous section, characterized in that the mesh sections fixed in a frame on which at least one sealed elastic gasket is installed on the side of the fluid flow, while radial grooves are made in the frame, communicating Xia with longitudinal channels.