WO2013017811A1

WO2013017811A1 - Stevenson filter

Info

Publication number: WO2013017811A1
Application number: PCT/GB2012/000583
Authority: WO
Inventors: Deryck Stevenson
Original assignee: Deryck Stevenson
Priority date: 2011-07-30
Filing date: 2012-07-10
Publication date: 2013-02-07
Also published as: GB201113158D0

Abstract

A filter for use with fluid pumps is diclosed, the filter having a base and side wall, whereby a portion of the side wall is concaved, such that the filtering area as well as the distance between the filter and an outlet pipe are increased, in order to reduce blocking.

Description

STEVENSON FILTER

Description of a Filter junction

A Filters function is to protect the pump and to stop contaminants going into the pump impeller and clogging up the pump possibly stopping the pump or causing damage to same,

Filter

[0001],The invention relates to a filter for use in conduits or fluid systems, Optionally the invention relates to a unitary, metallic or non-metallic or (could be if a specific job requires it a metallic stainless steel or other none ferocious metal filter),

[0002] In order to provide for regular and intended flow of fluid through conduits and fluid systems, it is necessary to remove certain materials from the fluid (including clumps or coagulations of the fluid itself) that lend to prevent or restrict the flow of the fluid through the conduit or system, One way to accomplish this is to couple a filter to the conduit or system,

[0003] The filter comprises of a bousing and a removable perforated filter that allows fluid to flow through the perforations (and thus through the conduit or system), while preventing material or build up that is larger than the diameter of the perforations from continuing through the conduit or fluid system, The material that is prevented from continuing through the conduit or system builds up in the filter and must be removed or it would prevent or restrict flow through the filter, Because the filter is removable, it can be readily emptied of this build up and placed back into the filter container,

[0004]ln many applications a filter is used in conjunction with a fine particle filter usually a sand filter or an inline fine filters, By installing a filter directly upstream of the fine sand filter, so that the larger solids that would quickly clog the filter are removed before they get to the sand or inline filter so the fine particle does not have to be cleaned as frequently and stops the impeller of the pumps from being damaged, Filters are also often used in industry to protect pumps, nozzles, valves, heat exchangers, and other expensive equipment from harmful flow contamination by trapping dirt and foreign matter,

[0005] All older style filters, however, suffer from deficiencies,

The filter is close fitted to the filter housing so where the filter is close to the outlet pipe the area all around the pipe quickly gets clogged with solids when this happens it reduces the flow of the fluid considerably,

(0006) This invention overcomes the deficiencies of the older designs, in many ways, mainly allowing a much longer time of filtration before becoming clogged with debris and still being an efficient working filter for the pump, A pump needs a good flow of fluid to keep it lubricated and because of my invention the pump does not get clogged up so quickly this means that there is a greater flow of fluid so does not cause as much wear on the pump or pump impeller, (The filter will still need to be maintained and checked for debris/solids at regular intervals) [0007], All filters on the market at the moment differ from my invention due to the fact all the other filters are of a close fitting design all around the filter holder, this current design leaves no room for the fluid to go in between the filter and the f ilter holder so once the small area just over the outlet pipe gets blocked it reduces the pressure and the fluid flow significantly, my Concave/Convex tube invention steps the basket away from the outlet pipe allowing a much larger area to act as a filter and a far greater flow of fluid to keep the pump cool and better lubricated,

[0008],The invention herein solves the deficiencies of all the older styles and designs,

Statement of invention:

A filter for use with a fluid pump, the filter having a base and side wall, it has a portion of the side wall that is concaved and traverses up the side and can run up to the full height of the filter such that in use the filter has an area stepped away from the outlet pipe and the side wall of the filter holder, such as in use a concaved portion extends upward from the bottom of the outlet pipe side of the filter and ean terminate at the top of the outlet pipe side of the filter at the rim,

[0009],The invention filtration can run up to the full height of the filter due to having a an inversion this cause a Concave/Convex tube possibly running the full height of the filter basket on the outlet pipe side of the filter thus creating a much larger surface filter area the Concave/Convex tube then being further away from the outlet pipe and the surface area of the filter holder on the internal wall of the filter holder will allow a lot more debris into the filter meaning it can go longer between cleaning the filter but without reduction of pressure, flow of fluid or performance of the pump, not as most of this type of filters are normally a close fit or touching all around the shape of the filter to the filter holder, this means just a few leaves or dead insects or solids getting sucked in and stuck over the filter covering the area over the outlet pipe will cause it to become blocked (usually the size of the effective area of the filter is no more than the diameter of the outlet pipe) this invention at the moment does not have to have a handle but it can be incorporated if required,

[0010],The invention maybe moulded as a single, in a two piece non-metallic unit to make it easier to clean, the filter can also be made in stainless steel or a brass material along with many other types of metals or plastics and can be made in any size from micron filters to millimetre filters the filter fits snuggly into the filter holder so even though virtually alt filters on the market are of an open net basket style all-round the way the filter allows fluid to pass through it and acts as a filter, the rest of the filter is touching the filter holder so very little fluid passes between the filter and the filter holder the fluid has to pass from the inlet pipe directly to the outlet pipe,

BRIEF DESCRIPTION OF THE DRAWINGS

For a more detailed description of the invention, reference will now be made to the accompanying drawings:

FIGURE 1

Side view of 1 being filter holder also fluid reservoir to make sure there is always fluid in the pump so the pump does not get air locks which would cause the pump to run dry, overheat and not work efficiently, shortening the working life of the pump, Also in figure 1 showing the Internal Filter 2, the dotted line being 3 is the internal Concave/Convex Filter tube filtering the fluid before going onto the outlet pipe 5, also showing the inlet pipe 4 the directional flow of fluid is from 4 to 5, there is also a removable lid 8 normally transparent to the filter holder 1, which allows for the maintenance and cleaning of the filter, the lid also acts as a locking seal between the 1 and 8 using a commercially available rubber "0" ring between 1 and 8 the lid of the filter holder and the Filter to create a fluid tight seal that, 6 (see FIGURE 3) fits very snuggly between 1 and 8 that holds the filter in place;

FIGURE 2. A top view showing the close fitting internal Filter 2 and the darker circle being Filter holder 1, With 2 and 1 being so close this will only allow a very small amount of fluid to pass through the filter/strainer wall 2 virtually all the fluid has to pass from the inlet Pipe being 4 through the internal Concave/Convex filter tube 3, then out through 5 being the outlet pipe, the Concave/Convex tube filter/strainer 3 running the whole height and being stepped away from the filter holder it will filter all the debris out of the fluid for a much longer period and far more efficiently:

FIGURE 3

Is a side view showing the filter 2, the Concave/Convex tube strainer 3 leading onto the outlet pipe 5 (see FIGURE 2), the top seating rim 6 which holds the Filter between filter holder 1 (see FIGURE 1) and the filter holder lid 8 (see FIGURE 1) and also showing the fluid inlet 4 where the inlet pipe allows the fluid to enter the Filter 2 and then through the filter to the Concave/Convex filter 3, this tubular instep needs to be at least diameter of the outlet pipe to function at its optimum efficiency it can be made much larger or even smaller but the unit will always function much better than all similar current filter designs, this is the embodiment of the invention,

FIGURE 4

showing the side view of the invention looking directly at 3 the filter Concave/Convex tube as a part of the filter 2, the filter shown is of a complete open net/filter style, but this can be a solid style body as the filter/strainer is close fit to the filter holder 1 (see FIGURE 1) and fluid will not pass anywhere except from the entry pipe 4 (see FIGURE 2) and on through the Concave/Convex filter 3 and then on to 5 (see FIGURE 2) the outlet pipe, the image also shows quite clearly the top sealing rim 6, the bottom or base of the filter 7 is enclosed and is all part of the same single moulding and can be a net/filter style to help keep down the cost or of solid construction same as the body it is generally cheaper to make them out of net/f ilter style as it uses less material, 9 the top of the Concave/Convex tube is enclosed to cover the filter to stop debris going over the top of the Concave/Convex tube and getting into the pump, this should be a solid top and a part of the top moulding of the filter,

FIGURE 5

Shows the difference between the old style filter figures 3 where there is only a very small area that needs to become blocked before the unit has to be cleaned And then the new filter, It is clearly seen that the newly designed unit can collect much more solids before becoming blocked or less efficient at its intended job of work

FIGURE 6

Shows the filter as a two part unit to be able to open for easy cleaning and maintenance,

Argument and Comparison between filter numbers WO OQ/18487 and this design

Both these filters have completely different applications the WO 00/18487 filter is fed through a pipe from the bottom of the filter to the top (Figure 1/1 item 14) then through the conical filter and out through the bottom of the conical filter (Figure 1/1 item 20) the filter housing unit is bolted together (Figure 1/1 items 34 & 34), It has been suggested that if this unit was turned on its side it would work in a similar manner to this design, This is not possible because if turning the filter housing 909, when opening the unit to inspect or clean the filter, all the fluid would drain out, because of this, each time the filter was cleaned and or serviced the pump would have to be charged and primed with fluid, During that time the pump would be running dry and cause severe overheating and wear to the pump reducing the working life and efficiency of the pump.

This is a completely different unit, The filter housing is on a vertical plane thus making sure the filter housing always remains full of fluid (Figure 1 item 1), It is fed from an inlet tube (Figure 1 item 4) just above centre height to the side of the housing and exits from an outlet tube (Figure 1 item 5) just above centre height on the opposing side of the housing, thus not allowing air into the impeller of the pump, The top of the filter housing (Figure 1 item 8) which is not my design it is a twist to lock & unlock system normally with a transparent window allowing easy access into the unit to remove the filter for cleaning,

Not only is there a vast difference in the working of the pump but the actual filtration method is different, The WO 00/18487 filter basket is a CONICAL design with the fluid flowing in through the top of the cone area and out through the base of the unit,

(0,E,D, Conical/Cone a solid or hollow object which tapers from a circular or roughly circular base to a point: Origin: late Middle English (denoting an apex or vertex): from French cone, via Latin from Greek konos)

This design is a CONCAVE/CONVEX design taking up the full height of the filter (figure 1 item 3) and wider than the outlet pipe, giving maximum filtration and allowing maximum flow of fluid, through the side outlet pipe (Figure 1 item 5) of the basket housing this gives a much larger filter surface area and means there are less working hours lost as it takes longer for the solids to block up this filter, over other standard filters of this type currently on the market,

(0,E,D, concave having an outline or surface that curves inwards like the interior of a circle or sphere: i,e, concave lenses

Concave = Origin: late Middle English: from Latin concavus, from con- 'together' + cavus 'hollow' concave)

As you can see, both of these units have completely different applications and bear no resemblance to each other in a working environment, They both stand on their own doing a completely different job of work,

Claims

CLAIM

A filter for use with fluid pumps, the filter having a base and side wall, it has a portion of the side wall that is concaved and traverses up the side and can go up to the full height of the filter basket such that in use the filter is stepped away from the outlet pipe, such as in use a concaved portion can extend upward from the bottom of the outlet pipe side of the basket and can terminate at the very top of the outlet pipe side of the filter at the rim.