RU8625U1 - SELF-CLEANING FILTER - Google Patents

Abstract

A self-cleaning filter containing a housing with nozzles: supplying the source fluid, discharging the filtrate and draining the wash flow, tube disks forming in the chamber body: receiving the initial fluid, filtrate and collecting sediment, filter elements with an annular channel, characterized in that the sediment collection chamber is made in the form of a hydrocyclone and equipped with a sediment discharge nozzle, and the permeable walls of the filter elements are made in the form of rigid grids covered with a soft filter cloth installed with the possibility of sequential and wave a reverse deformation of the filtrate between the liquid levels in the filtrate chamber and the evacuated annular channel, the channel dimensions and the filter web tension being related by the ratio 0.8≅h / (Rr) ≅1.5, where h is the free deflection of the filter cloth under the influence of gravity at horizontal position of the filter element; R is the outer radius of the annular channel; r is the inner radius of the annular channel.

Description

Self-cleaning filter.

A utility model relates to filter designs flushed with a filtered fluid. The utility model can be used by any industry in filtering processes.

A known filter design according to US patent. No. 2780363 of 02/05/57, the Filter has a housing with nozzles: supply of the original fluid, drainage of the filtrate and drainage of sediment, pipe disks forming the reception chamber and the filtrate, and cylindrical filter elements installed between the disks. Cleaning is carried out with compressed air, accumulated in a special container when filling the filter with the original liquid and used to purge the filter elements when draining the liquid from the filter. The disadvantage of this device is the design complexity and low regeneration efficiency, since the accumulated air is not enough for the effective regeneration of the filter elements.

As a prototype, a self-cleaning filter was adopted according to the USSR author's certificate No. 1558430 В 01 D 24/46, containing a housing with nozzles: supplying the initial liquid, drainage of the filtrate and drainage of the wash flow, tube disks forming in the chamber housing: receiving the initial liquid, filtrate and collection sediment, filter elements with an annular channel. The filter surface is cleaned by the reverse filtrate flow by sequentially disconnecting the annular channels of the filter elements from the receiving chamber and connecting them to the sediment collection chamber by means of a drive cam mechanism controlling special valves. The disadvantage of this filter is the design complexity, low reliability and quality of the regeneration of filter elements.

eWH

IPC 6 in 01 D 35/12, 01 D 24/46

The problem solved by the proposed utility model is to improve the quality and performance of filtering, simplifying the design and increasing the reliability of the filter.

The problem is solved due to the fact that in the filter that contains the housing with the nozzles: supply of the source fluid, drainage of the filtrate and drainage of the wash flow, tube disks forming in the housing of the chamber: intake of the fluid, filtrate and collection of sediment, and filter elements with an annular channel , the collection chamber of the sediment is made in the form of a hydrocyclone, and the permeable walls of the filter elements are made in the form of grids covered with a soft filter cloth installed with the possibility of wave-like deformation by the reverse flow of the filtrate I wait for the liquid levels in the filtrate chamber and the annular channel of the filter element when the latter is evacuated by draining the liquid, and the channel dimensions and the web tension of the filter element are related by the ratio:

0.8 h / (R-r) 1.5,

where: h is the free deflection of the filter cloth under the action of gravity with the horizontal position of the filter element;

R is the outer radius of the annular channel;

g is the inner radius of the annular channel.

Cleaning is carried out by stopping the supply of the initial liquid to the filter, stopping the filtrate from the filtrate chamber, connecting the filtrate chamber to the atmosphere and then evacuating the annular channel of the filter elements by draining the liquid from the filter through the contaminant drain, while the filtrate backflow into the annular channel undulates and sequentially deforms the filter cloth destroying and removing a layer of sediment from it.

effective regeneration at low pressure of the washing stream, allows to reduce the wear of the filter cloth, use fabrics for fine cleaning and shorten the filter maintenance periods.

In FIG. 1 shows a General view of the filter, section.

2 shows a section aa of FIG. one.

In Fig.3 shows a section bB of Fig.1.

FIG. 4 shows a remote element B of FIG. one.

In Fig. 3 shows a section GG of Fig. 4.

Figure 6 shows a section DD DD fig.Z.

In FIG. 7 - filter element in a horizontal position.

The preferred filter design includes a housing 1, divided by tube disks 2,3 into three chambers: a source fluid chamber 4 with a supply pipe 3, a filtrate chamber 6 with a filtrate discharge pipe 7 and an atmospheric pipe 8, a sediment collection chamber 9 with two pipes: for washing flow 10 and to drain sediment 11. Between the disks 2,3, filter elements 13 are installed in the rigid grids 12. The filter element 13 consists of a hollow blind cylinder 14 with flanges 13 and 16, in which a soft filter cloth 17 is fixed. The mesh 12 with a soft cloth 17 form a permeable wall of the annular channel 18 around cylinder 14. The annular channel 18 is connected by openings 19 and 20 with the chambers 4 and 9. The sediment collection chamber 9 is made in the form of a hydrocyclone with a conical bottom 21, a cylindrical shell 22 and an annular channel 23.

The filter works as follows.

The initial liquid is supplied through the inlet pipe 3 to the chamber 4, from where it enters the annular channel 18 through the holes 19, where it is divided into two streams - one passes through the filter cloth 17 and the mesh 12 and is removed through the outlet of the filtrate 7, the other is washed the flow, passing along the annular channel 18, removes sediment from the web 17, passes through the holes 20, enters the sediment collection chamber 9. A cylindrical shell 22 directs the wash flow to the top of the cone. The flow acquires a vortex movement due to the tangentially located nozzle 10. In this case, large sediment agglomerates are separated and creep into the conical bottom 21. From where the sediment is periodically removed through the sediment discharge nozzle 11. The process of removing fine sediment from the surface of the web 17 is carried out by hydromechanical shaking, carried out as follows way. The supply of the initial liquid and the filtrate are stopped for the time necessary for the natural discharge of liquid from the chambers 4 and 6 with the atmospheric pipe 8 open and one of the pipes 10.11, which achieves the evacuation of the annular channel 18 and the sequential, wave-like deformation of the canvas 17 by the reverse filtrate flow, which destroys the layer of fine sediment and removes it from the canvas. With a gradual decrease in different liquid levels in the filtrate chamber 6 and the evacuated annular channel 18, a layer-by-layer cleaning of the sheet 17 will take place. The most effective hydromechanical shaking off of the sediment from the sheet 17 occurs provided that the channel dimensions and the tension of the filter sheet element are related by the ratio: 0.8 h / (Rr) 1.5, where: h is the free leg of the filter cloth under the action of gravity, (controlled when the filter element is horizontal);

G is the inner radius of the annular channel.

The tests showed that the proposed design is simpler and more reliable than analogues and provides improved cleaning quality and process productivity due to the use of fabrics for fine filtering and shortening maintenance periods.

The industrial applicability of the proposed device is confirmed by testing a prototype at the Pizhegorodsky enterprise AOOT Lakokraska and showed good results. The simplicity of the proposed filter design allows manufacturing at any of the enterprises involved in the production of filtering equipment.

The listed features distinguish the proposed technical solution from the prototype and determines the compliance of this solution with the requirements of the utility model.

Claims (1)

A self-cleaning filter containing a housing with nozzles: supplying the source fluid, discharging the filtrate and draining the wash flow, tube disks forming in the chamber body: receiving the initial fluid, filtrate and collecting sediment, filter elements with an annular channel, characterized in that the sediment collection chamber is made in the form of a hydrocyclone and equipped with a sediment discharge nozzle, and the permeable walls of the filter elements are made in the form of rigid grids covered with a soft filter cloth installed with the possibility of sequential and wave a reverse deformation of the filtrate between fluid levels in the filtrate chamber and the evacuated annular channel, the channel dimensions and the filter web tension being related by the relation
0.8≅h / (Rr) ≅1.5,
where h is the free deflection of the filter cloth under the action of gravity with the horizontal position of the filter element;
R is the outer radius of the annular channel;
r is the inner radius of the annular channel.