MXPA99003097A - Filtration apparatus - Google Patents

Abstract

A filtration apparatus (10) for fluids containing solid matter and/or particles or the like is disclosed. The apparatus (10) comprises screen means (20) and barrier means (21) substantially adjacent and behind the screen means (20). The barrier means (21) has a plurality of corrugated ribs (23) with vent means (22) therein. The corrugated ribs (23) are elongate and parallel and are substantially concave corrugations when seen from the direction from where the fluid is coming while the corrugations are substantially aligned with the direction of the flow of the fluid.

Description

FILTRATION APPARATUS The present invention relates to filtration and, in particular, to a filtration apparatus in which a fluid, preferably water, passes through a fine mesh screen that traps solid matter or particles, which are cleaned from the screen of the filter. fine mesh allowing the filter apparatus to more efficiently remove solid matter or particles from the fluid.

BACKGROUND OF THE INVENTION Within the filtration industry, and in particular with respect to the filtration of wastewater in wastewater treatment works, there are problems associated with the filtration of solid matter and / or particles through mesh screens. and similar. In the particular case of wastewater treatment works, the presence of mixed bathing paper as the solid matter and / or particles in the treated wastewater for the first time causes problems with the fine mesh screens. This is because the mixed bath paper is cellulose which tends to be trapped by the fine mesh screen and therefore accumulates to obstruct the efficient passage of wastewater already treated for the first time, which at this stage of the treatment is water REF: 29918 relatively clean with a certain amount of dissolved impurities in it. When the cellulose is trapped, the efficiency of the treatment of the filtration process decreases and therefore a regular cleaning, cleaning and maintenance of the fine mesh sieves is required. Therefore, it would be advantageous to provide a filtration apparatus in which a fluid, preferably water, passes through a fine mesh screen that traps solid matter or particles which are cleaned from the fine mesh screen while the apparatus is being used. Such an apparatus would improve the efficiency of the filtration process ... decreasing the regular cleaning, cleaning and maintenance required. Although the foregoing and following descriptions relate primarily to the wastewater filtration apparatus or water treatment works, it should be readily appreciated that the filtration apparatus of the present invention would be suitable for the filtration of other liquids as well as gases since The filtration apparatus is suitable for filtering solid matter and / or particles which are present in a variety of fluids.

OBJECT OF THE INVENTION An object of the present invention is to provide an improved filtering apparatus, which substantially overcomes or improves the aforementioned disadvantages. At least, the object of the invention is to provide an alternative to known filtration devices.

BRIEF DESCRIPTION OF THE INVENTION According to one aspect of the present invention there is provided a filtering apparatus comprising: a filtering screen arranged to filter solid matter and / or particles or the like from a stream of fluid passing through the filter screen; and, barrier means located on a downstream side of and adjacent to the filter screen and having a plurality of reflective edges provided therein, each of the reflecting edges has a concave surface substantially oriented in an upstream direction, wherein a portion of the fluid passing through the filter screen is directed back to the filter screen, the barrier means also have fluid vents provided therein to allow the fluid to pass through the barrier means so that, in In use, the fluid directed back to the filter screen dislodges any solid matter and / or particles retained therein to clean the filter screen and maintain the flow of fluid therethrough. Preferably the barrier means further comprises a plurality of intermediate baffle edges provided therein, each of the baffle edges having a convex surface substantially oriented in the upstream direction. Typically the plurality of reflective edges are substantially parallel and the plurality of deflecting edges are parallel, and wherein the convex surfaces of the deflecting edges and the concave surfaces of the reflective edges are aligned to form a corrugated surface of the barrier means substantially oriented in an upstream direction. In a preferred form of the invention, the filtration apparatus is located in a housing having an inlet and outlet for the passage of the fluid and a sediment collection chamber. Preferably, control baffle means controls the flow of fluid to the sediment collection chamber which has means to clean the sediment to remove sediment therefrom. In the preferred form the housing comprises an inlet tube that constitutes the inlet, an outlet tube that constitutes the outlet and a sediment collection tube that constitutes the sediment collection chamber. Preferably the diameters of the inlet tube and the outlet tube are substantially the same, while the diameter of the sediment collection tube is larger. Preferably, the filtration apparatus covers the outlet tube in a three-way connection of the inlet tube, the outlet tube and the settling tube. The control deflector means is preferably also located in this three-way joint. Preferably, the three-way junction has an angle of 74.79 ° between the outlet tube and the sediment collection tube, an angle of 154.81 ° between the outlet tube and the inlet tube and therefore an angle of 132.90 ° between the inlet tube and the sediment collection tube. The inlet pipe preferably has a bend having an angle of 154 ° with the inlet pipe having at its inlet a parallel pipe and therefore diverted from the outlet pipe. The preferred angles of the three-way junction and the bend of the inlet tube help the flow of fluid in the housing. In this preferred form, the filtration apparatus has the shape of an oval-shaped body to fit the circular tube at an oblique angle. The oval-shaped body projects towards the outlet tube.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram of a filtering apparatus and housing a preferred embodiment of the present invention; Figure 2 is a partial, longitudinal cross-sectional view of the filtration apparatus of Figure 1 showing the filter housing, a filter disc having edges and a filter screen; Figure 3 is a front view of a filter disk of Figure 2; Figure 4 is a rear view of a filter disk of Figure 2; Figure 5 is a front view of a filter screen of Figure 2; Figure 6 is a rear view of a filter screen of Figure 2; Figure 7 is a partial schematic cross-sectional view of the filter disc of Figure 2; Figure 8 is a detailed view of a control baffle of the filtration apparatus of Figure 1; Figure 9 is a plan view of the control baffle of Figure 8; Figure 10 is a detailed sectional view of a sedimentation wash valve of the filtration apparatus of Figure 1; Figure 11 is a detailed sectional view of an outlet of the sedimentation wash valve of Figure 10; Figure 12 is a cross-sectional, schematic, partial view similar to Figure 7 of a filter disc of another embodiment; Figure 13 is a schematic, partial, cross-sectional view of a single edge of the filter disc of Figure 2 suitable for use with the liquid fluids shown in greater detail; Figure 14 is a cross-sectional, schematic, partial view of a single edge of the filter disc of Figure 12, which is shown in greater detail; Figure 15 is a schematic, partial, cross-sectional view of a single edge of the filter disc of Figure 2 suitable for use with gaseous fluids, which is shown in greater detail; Figure 16 is a front view of a filter disc and a filtering screen of one more mode; and Figure 17 is an exploded view of the filter disc and the filter screen of Figure 16.

BEST MODE FOR CARRYING OUT THE INVENTION A filtration apparatus 10 as shown in Figure 1 is located in a housing 11 having an inlet 12, an outlet 13 and a sediment collection chamber 14. In this preferred embodiment of the invention, the inlet 12, the outlet 13 and the sediment collection chamber 14 are tubes having circular cross sections with a three-way junction 15. The filtration apparatus 10 is located at the three-way junction covering the outlet 13 while a control baffle 16 is in the three-way junction 15 positioned at the entrance of the sediment collection chamber 14. The filtration apparatus 10 includes a fine mesh screen 20 and a barrier 21 having vents 22. The fine mesh screen is preferably 50 microns, however this is simply a preferred dimension since the size of the screen depends on the filtration requirements. The barrier (or filter disk) 21 in this embodiment has the shape of an oval-shaped body to fit in the outlet tube at an oblique angle. As illustrated in the drawings. The disc-shaped body is simply preferred and the shape can be a flat disc. The barrier 21 will be referred to as the filter disc 21 for clarity. The fine mesh screen 20 takes the same shape as the filter disk 21 since the filter disk 21 comes into contact with the fine mesh screen 20 on the outlet side of the housing 11. The filter disk 21 has a number of corrugated edges. parallel 23 with the vents 22 allowing the fluid, preferably water, to pass through it. The corrugated edges 23 of the preferred embodiment are substantially concave when viewed from the direction of flow and the longitudinal axes of the corrugated edges 24 follow the flow direction since they are substantially aligned along the side of the inlet tube 12. has found that this alignment provides the best results, however, other alignments are within the scope of the present invention. The ventilations. 22 are slots in the disc 21 located in the margins of the concave corrugated edges 23 which are joined by the intermediate convex portions 24. The vents are preferably located at the inflection point of the concave corrugated edges 23 and the convex portions 24. It is noted that the concave corrugated edges 23 are substantially wider than the convex portions 24. The filter disc 21 and the fine mesh screen 20 are placed in the housing 11 on a lip 25 which engages a corresponding slot 26 in - a collar 27 around the circumference of the disk 21 and the screen 20.

The baffle 16 as illustrated in Figures 1 and 9 is provided to control the flow of the fluid after it passes to the filtration apparatus 10. The baffle 16 has an opening 28, which allows the flow to pass through but a Obstruction 29 controls the flow in an upward direction. The sediment collection chamber 14 has a flushing valve 31 that covers a flushing outlet 32. The flushing valve 31 is preferably operated by a solenoid device 33 and is periodically operable automatically or can be operated when want in the usual way. The sediment collection chamber 14 preferably also has a drainage plug 34 for emptying it. The filtration apparatus 10 is used to filter fluids, preferably water or wastewater having solid matter and / or particles contained therein. The housing 11 has been designed so that the preferred fluid flow interacts with the filtration device 10. The diameters of the inlet tube 12 and the outlet tube 13 are preferably the same, while the diameter of the sediment collection chamber 14 is slightly higher. The inlet tube 12 preferably has a fold in it and the outlet tube 13 is preferably parallel and is deviated from the portion beyond the inlet tube. Preferably, the three-way junction has an angle of 74.79 ° between the outlet pipe 13 and the sediment collection chamber 14, an angle of 154.81 ° between the outlet pipe 13 and the inlet pipe 12 and so both an angle of 132.90 ° between the inlet tube 12 and the sediment collection chamber 14. The inlet tube 12 preferably has a bend having an angle of 154. °. The preferred angles of the three-way junction and the inlet tube 12 are bent to assist the flow of fluid in the housing 11. It is noted that the filtering apparatus 10 is positioned at an angle to flow and flow and turbulence caused by the control baffle 16 aids in the collection of the solid matter and / or particles in the sediment collection chamber 14. The solid matter and / or particles are prevented from returning to the three-way junction 15 of the housing 15 after of being filtered from the fluid. It is believed that the fluid passing through the filtration apparatus 10 interacts with the corrugated edges 23 and the vents 22 to clean the solid matter and / or particles from the fine mesh screen 20 to improve the flow through the filtration apparatus 10. to, therefore, filter more fluid within a period of time. The fluid is directed from the back of the corrugated edges 23 towards a screen 20 to thereby dislodge any solid matter and / or particles retained therein. It has been found that with the use of the filtration apparatus 10 of the present invention the cleaning of the screen is substantial and that the requirement that the apparatus be out of service to effect the same is negligible. A filter disc of another embodiment is illustrated in Figures 12 and 14. In this embodiment the filter disc 41 has vents 42 with corrugated edges 43 therebetween. The convex portions of the above-described embodiment take the form of projecting intermediate portions 44. The vents 42 are therefore between the margins of the corrugated edges 43 and the projecting intermediate portions 44. This mode of the filter disc works substantially in the same way as the modality already described. The different relative dimensions of the edges 23 of the filter disc 21 as illustrated in Figures 13 and 15 illustrates the different requirements of the filter disc 21 when used with liquids and gases, respectively. It has been found that for the most efficient use of the apparatus 10 of the present invention that the total area of the vents 22 should be approximately equal to the total area of the apertures of the fine mesh screen 20 when the apparatus 10 is used with liquids. However when the apparatus 10 is used with gases, the total area of I S vents should be substantially greater than the area of the screen openings. For the best operation of the apparatus 10 and the housing 11 when it is used with liquids and gases, the sum of the total area of the vents 22 and the total area of the openings in the fine mesh screen 20 should be approximately 150% of the diameter of the inlet tube 12. It is observed from the relative dimensions of the edge 23 of Figures 13 and 15, that when the apparatus 10 is used for gases instead of liquids, the widths and depths of the edges 23 are reduced, while that the separations of the vents 23 increase. A further embodiment of the filtering apparatus according to the invention is illustrated in Figures 16 and 17. In this embodiment, the filtering apparatus is in the form of a filter disc 50 having a filtering screen 51 in the form of a fine mesh designed for filtering solid matter and / or particles from a stream of fluid passing through the filter screen 51. As can be seen more clearly in Figure 17, the filter disk 50 also has barrier means located on a downstream side of and adjacent to the filter. filter screen 51 and having a plurality of substantially parallel reflecting edges 53 provided therein. Each of the reflecting edges 53 has a concave surface substantially oriented in an upstream direction. The reflective edges 53 are formed with support flanges 54 and together form part of a reflector member 52. The barrier means of this embodiment also includes a deflector member 55 provided with a plurality of intermediate deflecting edges 56 therein. Each of the baffle edges 56 has a convex surface substantially oriented in the upstream direction. A spacer member 57 is located between the deflector member 55 and the reflector member 52 so that in its assembled condition the barrier means are formed with a plurality of fluid vents in the form of elongated spaces located between the separate edges of the reflecting edges. 53 and the baffle edges 56. Both the reflective edges 53 and the baffle edges 56 are arranged parallel to and equidistant from each other with the convex surfaces of the baffle edges 56 and the concave surfaces of the reflective edges 53 aligned to form a substantially corrugated surface. oriented in an upstream direction. A retainer member 58 is provided to retain the filter screen 51 in contact with the deflector member 55. In use, a portion of the fluid passing through the filter screen 51 is directed back to the filter screen 51 by the concave surfaces. of the reflective edges 53. The fluid directed back to the filter screen 51 dislodges any solid matter and / or particles retained thereon to clean the filter screen and maintain the flow of fluid therethrough. The fluid vents formed with the spaces between the baffle members 56 and the reflector members 53 allow fluid to pass therethrough and outwardly between the support flanges 54. The foregoing describes only some embodiments of the present invention, and can be obvious modifications to those skilled in the art without departing from the scope of the present invention.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims (18)

CLAIMS Having described the invention as above, property is claimed as contained in the following:

1. A filtration apparatus characterized in that it comprises: a filter screen arranged to filter solid matter and / or particles or the like from a stream of fluid passing through the filter screen; and, barrier means located on a downstream side of and adjacent to the filter screen and having a plurality of reflecting edges provided therein, each of the reflecting edges has a concave surface substantially oriented in an upstream direction, wherein a portion of the fluid passing through the filter screen is directed back to the filter screen, the barrier means also have fluid vents provided therein to allow the fluid to pass through the barrier means so, in use , the fluid directed back to the filter screen dislodges any solid matter and / or particles retained in it to clean the filter screen and maintain the flow of fluid therethrough.

2. The filtration apparatus according to claim 1, characterized in that the barrier means further comprises a plurality of intermediate baffle edges provided therein, each of the baffle edges having a convex surface substantially oriented in the upstream direction, wherein the convex surfaces of the deflecting edges and the concave surfaces of the reflective edges are aligned to form a corrugated surface of the barrier means substantially oriented in an upstream direction.

The filtration apparatus according to claim 2, characterized in that the plurality of the reflecting edges are substantially parallel and the plurality of deflecting edges are substantially parallel, and wherein the convex surfaces of the deflecting edges and the concave surfaces of the Reflective edges are aligned to form a corrugated surface of the barrier means substantially oriented in an upstream direction.

The filtration apparatus according to claim 3, characterized in that the fluid vents are in the form of elongated openings located adjacent to the reflecting edges.

5. The filtration apparatus according to claim 4, characterized in that the elongated openings are located substantially at a point of inflection of the concave surfaces of the reflective edges and the convex surfaces of the deflecting edges.

The filtration apparatus according to claim 3, characterized in that the concave surfaces of the reflecting edges are substantially wider than the convex surfaces of the deflecting edges and the deflecting edges are in contact with the filter screen, which is in shape of a fine mesh.

The filtration apparatus according to claim 3, characterized in that the convex surfaces of the intermediate deflecting edges project above the separated edges of the adjacent concave surfaces of the reflecting edges with the fluid vents being formed by a space between the convex surfaces that project and the adjacent concave surfaces.

The filtration apparatus according to claim 7, characterized in that the protruding convex surfaces project towards the area of the concave surfaces.

9. The filtration apparatus according to claim 1, characterized in that the filtration apparatus is located in a housing having an inlet and an outlet for the passage of the fluid and a sediment collection chamber.

The filtration apparatus according to claim 9, characterized in that the control baffle is provided to control the flow of the fluid into the sediment collection chamber, which has means of washing sediment to remove sediment from it.

11. The filtration apparatus according to claim 9, characterized in that the housing comprises an inlet tube constituting the inlet, an outlet tube constituting the outlet, and a sediment collection tube constituting the sediment collection chamber. .

The filtration apparatus according to claim 11, characterized in that the diameters of the inlet tube and the outlet tube are substantially the same, while the diameter of the sediment collection tube is larger.

The filtration apparatus according to claim 9, characterized in that the filtering apparatus covers the outlet pipe in a three-way connection of the inlet pipe, the outlet pipe and the sediment collection pipe.

The filtering apparatus according to claim 13, characterized in that the control deflector is also located at the three-way junction.

15. The filtration apparatus according to claim 14, characterized in that the three-way connection forms an angle of 74.79 ° between the outlet tube and the sediment collection tube, an angle of 154.81 ° between the outlet tube and the inlet tube and therefore an angle of 132.90 ° between the inlet tube and the sediment collection tube.

16. The filtration apparatus according to claim 15, characterized in that the inlet pipe has a bend that has an angle of 154 ° towards the inlet pipe, having at its inlet a pipe parallel to and therefore diverted from the pipe. of exit, where the angles of the union of three routes and the fold of the entrance tube help the flow of the fluid towards the housing.

17. The filtration apparatus according to claim 13, characterized in that the filtering apparatus is in the form of an oval-shaped body adapted to fit the circular tube at an oblique angle.

18. The filtration apparatus according to claim 17, characterized in that the oval disc-shaped body projects towards the outlet tube.