RU2335326C1 - Immersion water intake filter with dynamic module - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention concerns natural water treatment and can be applied in water supply systems of various industrial facilities. Filter includes a case; several rings of gradually decreasing diameter, installed in the case at equal distance between rings; ejector; foul water inlet jet; purified water outlet jet, impurities outlet jet. Ejector is connected to a pump and mounted inside impurity outlet jet fastened in a hole in case bottom. Foul water inlet is a flow conditioner attached at one end to the case. The other end bears protection device in the form of a mesh cylinder with a tapered fairing deflector fastened to one its end. The ring series of gradually decreasing diameter, installed in the case, forms dynamic module, with rings interconnected by supports positioned outside and attached to shell in the form of tapered cone. Inner surface of each ring is streamlined in direction facing treated water flow.

EFFECT: simplified construction, increased filter capacity and life time.

2 cl, 6 dwg

Description

The invention relates to natural water purification devices and can be used in water supply systems of enterprises of various industries.

Known devices for cleaning water systems that use methods of sedimentation, flotation, air aeration, filtering through a porous charge with periodic washing, water and air supply in countercurrent, water purification in a centrifugal force field, biological treatment.

These devices allow you to purify water from any one pollutant, require flushing and replenishing the porous load, require large areas for flotation, sedimentation, biological treatment.

A known filter for cleaning liquid, comprising a housing, a mesh partition located in the housing with a layer of granular filter load placed on it, a nozzle for supplying a cleanable fluid, which is located above the loading layer, a nozzle for draining the filtrate located under the mesh partition, a nozzle for draining the washing liquid and means for creating a closed hydrodynamic flow during regeneration [USSR Author's Certificate No. 1113151, cl. B01D 24/46, 1984].

The disadvantage of this known device is the high flow rate of the washing liquid during the regeneration of the filter load.

A known filter for cleaning liquids from mechanical impurities, including a housing with inlet and outlet pipes, a filter element made in the form of a spring, and nozzles mounted on the end of the filter element, made in the form of a truncated cone mounted coaxially to the filter element and provided with a bottom in the form of a plug [A.S. USSR No. 869792, cl. B01D 27/12, 1980).

In this device, when filtering a fluid containing filamentary and fibrous inclusions having a density close to the density of the liquid, these inclusions do not settle on the bottom of the filter and pass in transit with the flow to the filter element, gradually enveloping the coil of the spring and connecting them together. In this case, the magnitude of the pressure head acting on the nozzles is, as a rule, insufficient to break the fibrous inclusions and disconnect the spring coils, as a result of which filter disassembly and mechanical cleaning from fibrous inclusions is required to restore the filter performance, which reduces the reliability and leads to an increase labor costs for maintenance and unproductive downtime of the filter unit.

A device for cleaning is known, in which an ejector is installed in the nozzle for the release of impurities and contaminants [SU No. 1018692, class. B01D 45/04, 1983].

A device for separating multicomponent media, comprising a housing, a series of rings of successively decreasing diameter installed in it [RU 2102113, class. B01D 45 / 04.1998).

The device is mainly used for cleaning gases from solid particles, and in this design rings of a rather complicated configuration are used, greater accuracy of their production is required, which leads to an increase in labor costs in manufacturing.

A known filter containing three coaxially placed in one another mesh truncated filter cones, each subsequent one of which is counter-directed relative to the previous one, while all cones are rigidly interconnected. The means of washing the grids of cones are three groups of hydrodynamic planes, also rigidly interconnected and oriented along the generatrix of the corresponding three imaginary cones, independently rotationally placed relative to the mesh ones. The means of rotation of the cones are their spokes having a profile similar to that of a ship propeller. The washing of the grids of mesh cones occurs due to the hydrodynamic pressure of the water created at the surfaces of the grids when the hydrodynamic planes move relative to them [Russian patent No. 2208086, EV 8/08, publ. 07/10/2003].

The disadvantage of this filter is the design complexity and low performance.

The problem to which the invention is directed, is to simplify the design, increase productivity and service life of the filter.

The problem is solved due to the fact that in the submersible water intake filter with a dynamic module containing a housing, a series of rings of successively decreasing diameter installed in it, the size of the slots between the rings is constant, an ejector, a fitting for the input of contaminated liquid, a fitting for the outlet of purified water, a fitting for the exit of impurities, characterized in that the ejector is connected to the pump and installed inside the nozzle for the exit of impurities, fixed in the through hole of the bottom of the housing, a fitting for the input of contaminated liquid It is a flow stabilizer attached at one end to the housing, a protective device in the form of a mesh cylinder is installed at the other end, at the end of which a cowl is mounted, which is a conical chipper, and a series of rings of gradually decreasing diameter mounted in the housing forms a dynamic module, while the rings are connected with each other using support elements located outside and attached to the shell in the form of a truncated cone, the inner surface of each ring has a streamline th form from liquid flow to be cleaned.

In addition, the body and flow stabilizer are mounted on supports at the bottom of the reservoir to be cleaned.

The invention is illustrated by drawings.

Figure 1 is a General view of a submersible intake filter with a dynamic module.

Figure 2 is a field of velocities arising in a dynamic module.

Figure 3 - the location of the fluid flow lines in the field of filter rings.

Figure 4 - the trajectory of the suspended particles in the fluid flow.

Figure 5 - the trajectory of the suspended particles in the fluid stream at the exit of the dynamic module.

6 is a section of the rings of the dynamic module.

The numerical simulation of a submersible water intake filter with a dynamic module was performed by the finite element method based on the Navier-Stokes equations; during the simulation, the velocity field, streamlines, and trajectories of suspended particles in the fluid flow were calculated.

The submersible water intake filter with a dynamic module includes a housing 1, which is a pipe 2 with a fitting 3 for the outlet of purified water, connected to the bottom 4 with a through central hole, a fitting for the input of contaminated liquid, which is a flow stabilizer 5 for equalizing the average liquid velocity in each point of the flow and the liberation of the flow from vortices and secondary flows, connected at one end to the housing 1, on the other end of which a protective device is installed in the form of a mesh cylinder 6, exclude its penetration of fish and algae. At the end of the mesh cylinder 6 on the uprights 7, a fairing is fixed, which is a conical chipper 8, which protects the filter from accidental large or long objects getting into its internal cavity. The housing 1 and the flow stabilizer 5 are mounted on supports 9 at the bottom of the reservoir to be cleaned. In the housing 1, coaxially with the pipe 2, a dynamic module 10 is mounted, consisting of a shell 11 in the form of a truncated cone and rings 12 located with a gap. The rings 12 are interconnected and attached to the shell 11 by means of supporting elements 13 located outside the rings 12, the size of the rings 12 decreases in the direction of flow, forming a conical surface, the inner surface of each ring 12 is streamlined from the side of the flow of the liquid being cleaned, this, the size "a" of the slots between the rings 12 is constant.

At the end of the uprights 13 in the through central hole of the bottom 4, a fitting 14 is fixed for the release of impurities and contaminants, an ejector 15 is installed inside the fitting 14. The ejector 15 is connected to the pump 17 by a pipe 16. The dimensions of the fittings and the geometric dimensions of the dynamic module 10, the flow rate of the fluid into the ejector 15 are determined by the finite element method based on the Navier-Stokes equations.

The operation of the submersible intake filter with a dynamic module is as follows.

The pump 17 through the pipe 16 delivers a certain amount of liquid, which at high speed through the ejector 15 leaves the nozzle 14. The water stream flowing from the ejector 15 creates an additional pressure drop (vacuum) at the inlet and outlet of the filter, due to which the fluid flow a conical chipper 8, which protects the filter from accidental large or long objects getting into its internal cavity, rushes to the filter through the mesh cylinder 6, which excludes the penetration of fish and algae, and enters stably 5. When the flow of contaminated liquid flows within the flow regulator 5 is an alignment average fluid velocity at each point of the flow and the release of the flow of vortices and secondary flows. Then, a steady-state flow passes inside the shell 11 in the form of a truncated cone and enters the space formed by a set of rings 12. The hydrodynamics of the fluid movement in this filter zone is such that a local flow of increasing speed is created along the geometric axis of the filter, involving mechanical particles and other impurities. The fluid flow in the region of the rings 12 is divided into two parts. One part of the fluid continues to move in the axial direction, the second part of the flow passes through the slots between the rings 12. The suspended particles of impurities due to their inertia fall into the fluid flow moving in the axial direction (see Fig. 3.4 - the path of the particles of contamination).

A very small part of suspended particles of contaminants, having a relatively small size and mass, moves with part of the flow passing between the rings. However, the overwhelming majority of the particles of contaminants moves in the axial direction and enters the outlet for contamination 14.

Thus, a submersible water intake filter with a dynamic module is a continuously operating device, which, when submerged under the reservoir level and creates a driving force for the water intake, ensures that the selected stream is cleaned of mechanical impurities and contaminants.

The advantage of a submersible intake filter with a dynamic module is

- high efficiency of the working process based on the hydrodynamics of a moving stream;

- simplicity of design of the main body parts;

- ease of maintenance - there is practically no need to clean the filter surface;

- increased service life of the filter due to the fact that mechanical impurities are not in contact with the filter element;

- environmental Safety;

- filters of this design can be used in a wide range of performance.

Information sources

1. SU 1018692 A, 05.23.1983.

2. RU 2102113 C1, 01.20.1998.

3. RU 2055112 C1, 02.27.1996.

4. KASATKIN A.G. The main processes and apparatuses of chemical technology, Moscow, Publishing house of chemical literature, 1961, p. 35-36, 42-43.

5. RU 2102114 C1, 01.20.1998.

6. SU 1323646 A1, 07.15.1987.

7. GB 334569 A, 09/08/1930.

Claims (2)

1. Submersible water intake filter with a dynamic module, comprising a housing, a number of rings of successively decreasing diameter installed in it, the size of the slots between the rings is constant, an ejector, a nozzle for the entrance of contaminated liquid, a nozzle for the outlet of purified water, a nozzle for the exit of impurities, characterized in that the ejector is connected to the pump and installed inside the nozzle for the release of impurities, fixed in the through hole of the bottom of the housing, the nozzle for the input of contaminated liquid is a flow stabilizer, attached one end to the body, a protective device in the form of a mesh cylinder is installed on the other end, on the end of which a cowl is mounted, which is a conical chipper, and a series of rings of successively decreasing diameter mounted in the body forms a dynamic module, while the rings are interconnected by support elements located outside and attached to the shell in the form of a truncated cone, the inner surface of each ring has a streamlined shape on the side of the flow of the cleaned fluids. 2. Submersible water intake filter with a dynamic module according to claim 1, characterized in that the housing and flow stabilizer are mounted on supports at the bottom of the reservoir to be cleaned.

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