IT202100012767A1 - Self-cleaning filter device - Google Patents

Description

Title: Self-cleaning filter device.

DESCRIPTION

The present invention relates to a self-cleaning filtering device, the invention ? It has been particularly studied for filtering liquids, preferably water, however other uses are not excluded.

STATE OF THE ART

In the field of filters ? always felt the problem of low efficiency due to non-uniformity? of action of the filtering element and the consequent dirt which progressively settles on it. Two main solutions are known to solve the problem.

The first provides a surface of acceleration of the flow, usually conical, which allows you to reach a speed? of breakdown of the surface tension of the fluid, so that? the particles separating go to accumulate in an area of the filter designed for this purpose.

The second involves installing a series of rotating elements inside the filter which sweep the filtering element by detaching the dirt.

The first system? ineffective as yes ? noticed that the filter element, due to the flow, gets dirty in predetermined points of high passage.

The second one ? a complex and expensive system. The two systems do not appear to be combinable to compensate for each other, except in the face of a high complication and further increase in the cost of the filter.

Purpose of the present invention? that of solving all or part of problems of the prior art.

In particular, the purpose of the present invention ? that of providing a highly effective and low-cost self-cleaning filtering device.

A further general purpose of the present invention ? that of providing a filtering device which increases the general efficiency of the filter and maintains its performance over a long operating period.

Another further object of the present invention ? to provide a filtering device with a high uniformit? of filtering action of the filter element.

GENERAL INTRODUCTION

According to a first aspect thereof, the invention relates to a filtering device comprising:

- a chamber (10);

- an inlet (22) in the chamber (10) able to define inside the chamber a feed flow direction (SF) of a fluid to be filtered;

- an outlet (24) from the chamber (10) able to evacuate the filtered fluid;

- a filter element (15) operatively interposed between the inlet and the outlet;

- at least one deflection surface (32) arranged to intercept the feed flow (SF) to deflect it in a deflection direction (DF);

characterized in that

- comprises conveying means (40) (preferably comprising at least one conduit (42)) for conveying at least part of said feed flow in a direction other than said deviation direction (preferably at least partially counter-current with respect to the feed flow direction), where said conveying means (40) have at least one inlet opening (44) on the deflection surface Preferably the conveying direction (CF) directs the flow against the filter element (15), advantageously the conveyed flow part (CF) ? a self-cleaning flow of the filter element (15). Thanks to the turbulence also created the surface of the filter element with a high flow of fluid? extended, this effect increases particularly in the case in which the conveyed flow (CF) exits from the conveying means (for example from said conduit (42)) at least partially counter-current with respect to said feed flow.

According to some preferred embodiments, the conveying means (40) comprise at least one outlet opening (46) with a flow deviation path (42) arranged to connect them, where:

- also called outlet opening (46) ? on said deflection surface (32),

- said inlet opening (44) ? distal of the outlet (24) from the chamber (10) and said outlet opening (46) ? proximal to the outlet (24) from the chamber (10). Thanks to us? the outlet opening (46) is in a pressure condition which favors the fluid outflow, while the inlet opening (44) is in a pressure condition which favors the fluid inlet.

Said detour path (42) ? for example at least partially to V.

In general ? it is preferable that said conveying means (40) generate at least one conveyed flow (CF) directed against the filtering element (15).

For example, the outlet opening (46) ? oriented in such a way as to direct the conveyed flow (CF) against the filtering element (15) with a smaller inclination than the orthogonal one.

In general ? it is preferable that the conveying means (40) comprise a conveying path (42) with a non-linear development.

According to some preferred embodiments, with reference to the feed flow direction (X), the conveying means (40) comprise an outlet opening (46) facing said outlet of the chamber (24) in a direction radial to said direction of supply (X), with the interposition between them of the filtering element (15).

According to some preferred embodiments said conveying means (40) comprise a duct (42) with at least one inlet opening (44) coinciding with said inlet opening (44) located on the deflection surface (32).

Said duct (42) preferably comprises a plurality of inlet openings (44, 48, 50) placed on the deflection surface (32).

For example, the duct comprises two inlet openings (44, 48, 50) of different area from each other.

In this case, the duct preferably comprises at least one outlet opening (46) with an area greater than the area pi? smaller (48, 50) of the inlet openings, for example at least equal to the area of the inlet opening (44) of greater area.

According to some preferred embodiments said conveying duct (42) comprises at least one outlet opening (46) connected to a plurality of of said inlet openings (44, 48, 50) by means of a plurality? of branches (42a, 42b) that intersect each other.

For example the total number of exit openings (46) ? less than the number of inlet openings (44, 48, 50). There? advantageously allows an effective range and speed? of the conveyed flow.

Preferably, with reference to the feed flow direction (X), said at least one outlet opening (46) ? substantially facing the outlet (24) of the chamber (10), in a radial direction to said feed direction (X), with the interposition of the filter element (15).

According to some embodiments, is it preferable to prefer said deflection surface (32)? an at least partially conical surface and belongs to a solid (30) in which ? obtained (for example excavated) at least one conveying path (42) belonging to said conveying means (40) (preferably in which said conveying duct (42) is formed).

According to an application example said chamber (10) and said filtering element (15) are substantially cylindrical and nested one inside the other, where said deflection surface (32) and said conveying means are obtained in a deflecting and conveying element (30) nested in the filter element (15), where said feed flow (SF) ? an axial flow (X) in the chamber and the outlet (24) ? placed on the cylindrical surface (12) of the chamber (10).

According to a second general aspect thereof, the invention relates to a deflection and conveyance element (30) for a filtering device (1) of the type indicated above characterized in that it comprises at least the deflection surface (32) and the conveyance means (40) previously mentioned.

DETAILED DESCRIPTION

Further characteristics and advantages of the present invention will become clearer from the following detailed description of its preferred embodiments, made with reference to the enclosed drawings and given by way of non-limiting example. In such drawings:

figure 1 schematically shows a front view of a filtering device according to an embodiment of the present invention;

- figure 2 shows a section of figure 1 along the plane II;

figure 3 schematically shows the filtering device of figure 1 in side view;

- figure 4 shows a section of figure 3 along the plane IV;

figure 5 is a perspective view of the deflector and conveyor device of the filtering device of the previous figures, where the arrows indicate the flow deflected by the deflection surface and the flow deflected by the conveyance duct;

figure 6 shows the deflector and conveyor device of figure 5 in plan view;

figure 7 shows the deflector and conveyor device of figure 5 in front view;

- figure 8 shows a section of figure 7 along the plane B-B where the arrows show the deviation of the flow by the conveying duct;

figure 9 shows the deflector and conveyor device of figure 5 in side view;

- figure 10 shows a section of figure 9 along the plane A-A where the arrows show the deviation of the flow by the conveying duct.

With reference to figures 1 to 4 ? shown is a self-cleaning filtering device indicated as a whole with the reference number 1.

The filtering device comprises a casing 5 which defines inside it a filtering chamber 10 with a main development along a rectilinear axis X. The chamber preferably has a geometry of revolution around the X axis, for example comprising at least one delimiting wall 12 in the radial direction at least partially cylindrical. Pi? preferably room 10 ? essentially cylindrical.

The filtering device 1 comprises a filtering element 15 nested in the chamber 10 to divide it into an inlet subchamber 18 and an outlet subchamber 20 of the fluid to be filtered. the filter element preferably has a geometry of revolution around the X axis and more? preferably ? essentially cylindrical. In general ? it is preferable that the filter element 15 extends in the direction of the X axis for the entire length in said direction of the chamber 10.

The filtering element 15 for example comprises a mesh, a net or a filtering membrane suitable for filtering fluids, preferably liquids.

The inlet subchamber 18 comprises an inlet 22 for supplying the fluid to be filtered proximal to one of the two ends? of the chamber 10 in the direction of the X axis, where said entrance ? such as to direct the fluid according to a feed flow parallel to the X axis. Preferably the inlet ? coaxial to the X axis, pi? preferably comprises an inlet duct coaxial to the X axis.

The outlet subchamber 20 comprises an outlet 24 in the radial direction with respect to the X axis.

The fluid to be filtered to go from inlet 22 to outlet 24? forced to pass through the filter element 15.

The inlet subchamber 18 comprises inside it at least one deflector element 30 comprising a deflection surface 32 facing the inlet 22 to receive the feed flow and divert it so as to cause its acceleration. In general, the deflection surface 32 ? tapered so as to approach the filter element moving away from the inlet 22, in this way it cooperates with the filter element 15 to generate a bottleneck 33 between them with a decreasing passage area as one moves away from the inlet 22 For example the deflection surface? at least partially conical, frusto conica, pyramidal or frusto pyramidale, where the section of the pyramid is? any polygon. In general, the X axis? preferably an axis of symmetry of the deflection surface 32.

In the preferred embodiments the inlet 22 projects the feed stream directly onto the top of a conical deflection surface 32.

The deflection element 30 ? interposed, in the direction of the X axis, between the inlet 22 and a collection area 35 of the foreign particles which separate from the water due to the acceleration imposed by the deflection 32.

With reference to the direction of the X axis and to the direction of travel of the supply flow, in general the outlet 22 ? placed, or mainly placed upstream of the deflection surface, in such a way the fluid that ? been thrown into the collection area 35, it must reverse its direction to reach the exit.

In general ? it is preferably possible to ideally divide the chamber 10 into two parts 10a and 10b in the X direction, where the inlet 18 and the outlet 22 are contained, or mainly contained in the same part 10a, called for this reason the inlet and outlet part, and the deflector element 30 ? contained or mainly contained in the other part 10b, known for this reason as the deflection part.

As better visible in figures 5 to 10, in general the deflection element 30 comprises conveyance means 40 shaped to divert at least a part of the feed flow SF in a conveyance direction CF different from the deflection direction DF in which ? deflected by the deflection surface 35. Preferably the conveying direction CF ? at least partially against the current with respect to the direction of supply SF, the cio? for example and directed at least partially from the deflection part 10b towards the inlet and outlet part 10a.

Figure 5 in particular shows the feed flow SF sent by the inlet 22, the flow DF deflected by the deflection surface 35 and the flow CF conveyed by the conveying means 40.

The conveying means 40 preferably comprise at least one duct 42 hollowed out in the deflector element 30 with at least one inlet opening 44 placed on the deflection surface 35.

As can be better seen in figures 7 and 8, the duct 42 is substantially V-shaped and has an outlet opening 46, preferably also located on the deflection surface 35.

As better visible in Figure 2, with reference to the circumferential direction around the X axis, the inlet opening 44 is distal to the outlet 22, while the outlet opening 46 is proximal to the exit 22. Thanks to ci? the outlet opening 46 is located in an area of the chamber 10 with a lower pressure than the inlet opening 44, and the flow conveyed can exit the conduit 42 partially against the current as mentioned above.

Preferably, the flow conveyed CF out of the conduit 42 is directed towards exit 24, pi? preferably with an inclination with respect to the filtering element 15 other than orthogonal.

The flow conveyed CF in this way advantageously creates a turbulence in an area of the filtering device where in its absence the flow would be more intense. slow and where therefore the filter element would tend to get more dirty. The conveyed flow therefore has a self-cleaning action. It also allows you to take advantage of more? uniformly the filtering element, since also the zone in the inlet and outlet part 10a ? much more active in filtering than it would be without conveying means 40.

Preferably the inlet 44 and outlet 46 have equal area and preferably also equal shape.

As can be better seen in figures 9 and 10, the duct 42 can be articulated in a plurality? of ramifications. In particular, the illustrated example shows a first V-shaped branch 42a in the section of figure 7 and a second V-shaped branch in the section of figure 9. the two branches communicate at the vertex of the V.

The first branch 42a has the inlet and outlet openings 44 and 46 described above, while the second branch 42b has two inlet openings 48 and 50, both as they are located circumferentially distal from the outlet 22 of the chamber 10.

The branch 42b preferably has a lower range and speed? of greater flow than branch 42a. For example, inlet ports 48 and 50 have a smaller area than ports 42 and 44.

To complete the filtering device ? preferably a drainage opening 55 is present, preferably located in the collection area 35 and selectively openable and closable to allow or prevent the fluid from flowing out.

The two V-shaped arms intersect creating a connecting mouth through which the flow captured by the smaller lateral bowls flows. small ? conveyed to the outlet.

GENERAL INTERPRETATION OF TERMS

In understanding the scope of the present invention, the term "comprising" and its derivatives, as used herein, are understood to be open-ended terms specifying the presence of the stated characteristics, elements, components, assemblies, integers and/or phases, but do not exclude the presence of other undeclared characteristics, elements, components, groups, integers and/or phases. The above also applies to words that have similar meanings such as the terms "including", "have" and their derivatives. Furthermore, the terms "part", "section", "portion", "member" or "element" when used in the singular can have the double meaning of a single part or of a plurality? of parts. As used herein to describe the embodiment(s) above, the following directional terms "forward", "backward", "over", "down", "vertical", "horizontal", "under" and "transverse" , as well as any other similar directional term refers to the embodiment described in the operating position. Finally, terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the final result is not significantly changed.

While only selected embodiments have been chosen to illustrate the present invention, it will be clear to those skilled in the art from this description that various modifications and variations may be made without departing from the scope of the invention as defined in the appended claims. For example, can the size, shape, position or orientation of various components be changed as needed? and / or wishes. The components shown directly connected or in contact with each other may have intermediate structures disposed between them. The functions of one element can be performed by two and vice versa. The structures and functions of one embodiment may be adopted in another embodiment. Not ? It is necessary that all the advantages are present in a particular embodiment at the same time. Each feature that ? original compared to the prior art, alone or in combination with other features, should also be considered a separate description of further inventions by the applicant, including the structural and/or functional concepts embodied by those features. Thus, the foregoing descriptions of embodiments according to the present invention are provided for illustrative purposes only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

Claims (15)

1. Filter device including: - a chamber (10); - an inlet (22) in the chamber (10) able to define inside the chamber a feed flow direction (SF) of a fluid to be filtered; - an outlet (24) from the chamber (10) able to evacuate the filtered fluid; - a filter element (15) operatively interposed between the inlet and the outlet; - at least one deflection surface (32) arranged to intercept the feed flow (SF) to deflect it in a deflection direction (DF); characterized in that - comprises conveyance means (40) shaped to generate a conveyed flow (CF) in a direction other than said deflection direction, where said conveyance means (40) have at least one inlet opening (44) on the deflection surface (32 ). 2. Device according to claim 1, characterized in that the conveying means (40) comprise at least one outlet opening (46) with a flow deviation path (42) placed to connect them, where: - also called outlet opening (46) ? on said deflection surface (32), - said inlet opening (44) ? distal of the outlet (24) from the chamber (10) and said outlet opening (46) ? proximal to the outlet (24) from the chamber (10). 3. Device according to claim 2, characterized in that said deviation path (42) is at least partially to V. 4. Device according to any one of the preceding claims, characterized in that said conveying means (40) generate at least one conveyed flow (CF) directed against the filtering element (15). 5. Device according to any one of the preceding claims, characterized in that the conveying means (40) comprise a conveying path (42) with a non-linear development. 6. Device according to any one of the preceding claims, characterized in that, with reference to the feed flow direction (X), the conveying means (40) comprise an outlet opening (46) facing said outlet of the chamber (24 ) in a radial direction to said feed direction (X), with the interposition of the filter element (15) between them. 7. Device according to any one of the preceding claims, characterized in that said conveying means (40) comprise a duct (42) with at least one inlet opening (44) coinciding with said inlet opening (44) placed on the deflection surface (32). 8. Device according to claim 7, characterized in that said conveying duct (42) comprises a plurality of of inlet openings (44, 48, 50) placed on the deflection surface (32). 9. Device according to claim 8, characterized in that it comprises at least two inlet openings (44, 48, 50) of different area from each other. 10. Device according to claim 9, characterized in that it comprises at least one outlet opening (46) having an area greater than the area pi? small (48, 50) of the inlet openings. 11. Device according to any one of claims 8 or 10, characterized in that said conveyance duct (42) comprises at least one outlet opening (46) connected to a plurality of of said inlet openings (44, 48, 50) by means of a plurality? of branches (42a, 42b) that intersect each other. 12. Device according to claim 11, characterized in that the total number of outlet openings (46) ? smaller than the number of inlet openings (44, 48, 50) and where preferably, with reference to the feed flow direction (X), said at least one outlet opening (46) ? substantially facing the outlet (24) of the chamber (10), in a radial direction to said feed direction (X), with the interposition of the filter element (15). 13. Device according to any one of the preceding claims, characterized in that said deflection surface (32) is? an at least partially conical surface and belongs to a solid (30) in which ? obtained at least one conveying path (42) belonging to said conveying means (40). 14. Device according to any one of the preceding claims, characterized in that said chamber (10) and said filtering element (15) are substantially cylindrical and nested one inside the other, wherein said deflection surface (32) and said means of conveyance are obtained in a deflection and conveyance element (30) nested in the filter element (15), where said feed flow (SF) ? an axial flow (X) in the chamber and the outlet (24) ? placed on the cylindrical surface (12) of the chamber (10). 15. Deflection and conveyance element (30) for a filter device (1) according to any of the preceding claims characterized in that it comprises at least the deflection surface (32) and the conveyance means (40) mentioned in any of said claims .