CA1125669A - High speed water flow filter - Google Patents
High speed water flow filterInfo
- Publication number
- CA1125669A CA1125669A CA358,281A CA358281A CA1125669A CA 1125669 A CA1125669 A CA 1125669A CA 358281 A CA358281 A CA 358281A CA 1125669 A CA1125669 A CA 1125669A
- Authority
- CA
- Canada
- Prior art keywords
- filtration
- water
- filter
- filtered
- high speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Filtration Of Liquid (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
A high speed water flow filter, comprising: at least one generally tubular filter element having a wall provided with filtration passages, this element having at least one end open to the water flow, means for producing, at least during a filtration operation, a difference of pressure of the water inside and outside one end of the filtration element for compelling water being filtered to pass through said filtration passages around the end, said filtration passages being formed of an increasing caliber in the axial direction of said filtration element, from the end where said difference of pressure is created towards its other end.
A high speed water flow filter, comprising: at least one generally tubular filter element having a wall provided with filtration passages, this element having at least one end open to the water flow, means for producing, at least during a filtration operation, a difference of pressure of the water inside and outside one end of the filtration element for compelling water being filtered to pass through said filtration passages around the end, said filtration passages being formed of an increasing caliber in the axial direction of said filtration element, from the end where said difference of pressure is created towards its other end.
Description
5~
The present invention is.a division of the Canadian Patent Application 26S,995 having as inventor Charles Doucet.
The present invention relates to an Immersion filter for high speed water flow.
The fineness of a filter is usually provided when the filter is manufactured; to change the fineness it is necessary to replace the filtering elements.
There are also filters with which the fineness can be increased or reduced without changing filter elements, simply by loosening or tightening a continuous filter element formed of a.pile of discs or the turns of a helicoidal spring.
In each case, however, an intervention is necessary to change the finess of the filter. However difficult or simple it may be, from complete dismantling to simple adjustment, such an intervention is always necessary. No known filtering systems enable the fluid to be filtered to select a passage ; with a greater or lesser fineness as a function of the dif-; ficulty of the filtration, without any kind of intervention.
According to the present invention, there is provided a high speed water flow filter, comprising: at least one generally tubular fllter elemen~ having a wall.provided with filtration passages, said element having at least one end open to the water flows, means for pr.oducing, at least durmg a filtration operation, a difference of pressure of the water inside and outisde one end of said filtration element for compelling water being filtered to pass through said filtration passages around said end, said filtration passages ~ being formed of an increasing c~liber in the.a~ial direction of said filtration element, from the end where said difference of pressure is created towards its other end.
Preferably, the filter comprise one tubular filter element having both ends open to the w~ter flow or strea~l, the filtratio ~:Z5~
passages being slots along ge~eratrices of the tubular element, these slots being progressively wider from upstream to downstream in relation to the stream of water to be filtered. In such a filter the difference of pressure is created at the upstream end of said filter element.
Preferably, at the upstream end of the fllter element there is provided a tapered frusto-conical part leading to an below pipe which is connected to an aspiration pipe.
Preferably, the tubular filter is inserted into a flow of water in such a manner that the a~is thereof is substantially parallel with the said flow.
The accompanying drawings show, by way of example without any limitative manner, two embodiments of the filter according to the invention. In the drawings:
Fig. 1 is a schematic view of a filtering instal-lation including a first embodiment of filter, shown in longitudinal cross-section;
Fig. 2 is a side elevational view of a second embodiment of filter;
Fig. 3 is a cross-section along line 3-3 of Fig. 2;
and Fig. 4 is a cross-section along line 4-4 of Fig, 2.
The filter for water under pressure shown in Fig. 1 is formed of four tubular elements, two of which are shown at 1 and 2, each formed of three filtering tubes ~, 4 and 5 welded end-to-end. The downstream filtering tube 3 has fine filter passages, the intermediate tube 4 medium filter pas-sages and the upstream filtering tube 5 coarse filter passages.
The filtering elements 1, 2 are mounted in a fluid-tight casing 6 forming a filter body and which is connected between two sections of a pipe 7 along which water to be filtered and filtered water flows. A diaphragm 8 at the inlet
The present invention is.a division of the Canadian Patent Application 26S,995 having as inventor Charles Doucet.
The present invention relates to an Immersion filter for high speed water flow.
The fineness of a filter is usually provided when the filter is manufactured; to change the fineness it is necessary to replace the filtering elements.
There are also filters with which the fineness can be increased or reduced without changing filter elements, simply by loosening or tightening a continuous filter element formed of a.pile of discs or the turns of a helicoidal spring.
In each case, however, an intervention is necessary to change the finess of the filter. However difficult or simple it may be, from complete dismantling to simple adjustment, such an intervention is always necessary. No known filtering systems enable the fluid to be filtered to select a passage ; with a greater or lesser fineness as a function of the dif-; ficulty of the filtration, without any kind of intervention.
According to the present invention, there is provided a high speed water flow filter, comprising: at least one generally tubular fllter elemen~ having a wall.provided with filtration passages, said element having at least one end open to the water flows, means for pr.oducing, at least durmg a filtration operation, a difference of pressure of the water inside and outisde one end of said filtration element for compelling water being filtered to pass through said filtration passages around said end, said filtration passages ~ being formed of an increasing c~liber in the.a~ial direction of said filtration element, from the end where said difference of pressure is created towards its other end.
Preferably, the filter comprise one tubular filter element having both ends open to the w~ter flow or strea~l, the filtratio ~:Z5~
passages being slots along ge~eratrices of the tubular element, these slots being progressively wider from upstream to downstream in relation to the stream of water to be filtered. In such a filter the difference of pressure is created at the upstream end of said filter element.
Preferably, at the upstream end of the fllter element there is provided a tapered frusto-conical part leading to an below pipe which is connected to an aspiration pipe.
Preferably, the tubular filter is inserted into a flow of water in such a manner that the a~is thereof is substantially parallel with the said flow.
The accompanying drawings show, by way of example without any limitative manner, two embodiments of the filter according to the invention. In the drawings:
Fig. 1 is a schematic view of a filtering instal-lation including a first embodiment of filter, shown in longitudinal cross-section;
Fig. 2 is a side elevational view of a second embodiment of filter;
Fig. 3 is a cross-section along line 3-3 of Fig. 2;
and Fig. 4 is a cross-section along line 4-4 of Fig, 2.
The filter for water under pressure shown in Fig. 1 is formed of four tubular elements, two of which are shown at 1 and 2, each formed of three filtering tubes ~, 4 and 5 welded end-to-end. The downstream filtering tube 3 has fine filter passages, the intermediate tube 4 medium filter pas-sages and the upstream filtering tube 5 coarse filter passages.
The filtering elements 1, 2 are mounted in a fluid-tight casing 6 forming a filter body and which is connected between two sections of a pipe 7 along which water to be filtered and filtered water flows. A diaphragm 8 at the inlet
-2-end directs the dirty water to be filtered into the elements 1, 2. As the water flows along casing 6 it passes through the filter elem~nts and the filtered water flows out of the downstream end of casing 6.
At the downstream end of each filtering element 1, 2 is welded and eblow 9 passing fluid-tightly through the envelope 6. An automatic flushing valve 10 is mounted in the open end of each eblow 9. These valves 10 are normally closed.
In operation, water arrives from the first s~ction of pipe 7 at a relativelygreat speed (of the order of 2 to ~
m/sec~, penetrates in the filtering elements 1 and 2 and, by virtue of the speed of the water, passes through a filtering zone in the finest filtering tubes 3. There is thus Eormed a virtual ring which represents the Eiltering zone of each element of the filter. As impurities become deposited along the filtering surface and clog it, this ring moves towards the inlet of the filter, i.e. towards the coarsest filtering tube 5. When the filtering surfaces have become clogged to ; 20 a certain degree, a differential manostat 11 detecting the head loss on either side of the filtering element (~ and -) actuates opening of the flushing valves 10 by the intermediate of a programmer 12, electro-valves 13 and pneumatic control pistons 14. A decanting device 15 protects the control ap-paratus. When the flushing valves 10 are opened, a current of flushing water sweeps the inside of each filtering element 1, ~ and hence cleans all of its filtering surface. Then the valves 10 are closed and the filtering cycle recommences, the virtual ring reforming at the downstream end of the filtering elements.
An advantage of the described filter is that in the case of easy filtering of relatively clean water, the
At the downstream end of each filtering element 1, 2 is welded and eblow 9 passing fluid-tightly through the envelope 6. An automatic flushing valve 10 is mounted in the open end of each eblow 9. These valves 10 are normally closed.
In operation, water arrives from the first s~ction of pipe 7 at a relativelygreat speed (of the order of 2 to ~
m/sec~, penetrates in the filtering elements 1 and 2 and, by virtue of the speed of the water, passes through a filtering zone in the finest filtering tubes 3. There is thus Eormed a virtual ring which represents the Eiltering zone of each element of the filter. As impurities become deposited along the filtering surface and clog it, this ring moves towards the inlet of the filter, i.e. towards the coarsest filtering tube 5. When the filtering surfaces have become clogged to ; 20 a certain degree, a differential manostat 11 detecting the head loss on either side of the filtering element (~ and -) actuates opening of the flushing valves 10 by the intermediate of a programmer 12, electro-valves 13 and pneumatic control pistons 14. A decanting device 15 protects the control ap-paratus. When the flushing valves 10 are opened, a current of flushing water sweeps the inside of each filtering element 1, ~ and hence cleans all of its filtering surface. Then the valves 10 are closed and the filtering cycle recommences, the virtual ring reforming at the downstream end of the filtering elements.
An advantage of the described filter is that in the case of easy filtering of relatively clean water, the
3-~ ~S~;6~
operative tubes are the fine ones 3. In the case of filtering normally charged water, the intermediate tubes 4 with a medium filtering fineness operate and in the case of exceptional hardness (roughness) the coarse filtering -tubes 5 may, for a certain time, supply filtered water. It is in effect preferable, in the latter instance, to have an adequate supply of not-so-well filtered water rather than a shortage of filtered water or no filtered water at all, as may happen with fine f1lters which during periods of rough water necessitate continual cleaning.
The embodiment shown in Figs. 2 and 4 is a strainer which is placed in a current of water and is formed, say, of one filtering element immersed in a river, for example, and comprising a series of longitudinal T-section profiles 16 disposed in a cyllndrical con~iguration and defining slots 17 along generatrices of the cylinder, these slots 17 being ~`
progressively wider from upstream to downstream, in relation to the principal current of water to be filtered, represented by the arrows. At lts upstream end, the cylindrical part of the strainer is extended by a tapered section leading to an eblow pipe and terminatès with a ilange 18 which is connected to an aspiration evacuation pipe for filtered water, not sho~n.
At the downstream end, the ilter comprises a hydrodynamic device assisting the free evacuation of all impurities carried by the current, as will be descri~ed below.
` The water to be filtered penetrates from the exterior of the strainer through the longitudinal slots 17, and the filtered water is evacuated via the eblow pipe ànd flange 18. According to hydraulic laws confirmed in practice, the water penetrates into the filter ~rom the begining (i.e.
upstream end) of the slots 17, hence by the finest part of the filter.
When, following a period of rough water for example, r
operative tubes are the fine ones 3. In the case of filtering normally charged water, the intermediate tubes 4 with a medium filtering fineness operate and in the case of exceptional hardness (roughness) the coarse filtering -tubes 5 may, for a certain time, supply filtered water. It is in effect preferable, in the latter instance, to have an adequate supply of not-so-well filtered water rather than a shortage of filtered water or no filtered water at all, as may happen with fine f1lters which during periods of rough water necessitate continual cleaning.
The embodiment shown in Figs. 2 and 4 is a strainer which is placed in a current of water and is formed, say, of one filtering element immersed in a river, for example, and comprising a series of longitudinal T-section profiles 16 disposed in a cyllndrical con~iguration and defining slots 17 along generatrices of the cylinder, these slots 17 being ~`
progressively wider from upstream to downstream, in relation to the principal current of water to be filtered, represented by the arrows. At lts upstream end, the cylindrical part of the strainer is extended by a tapered section leading to an eblow pipe and terminatès with a ilange 18 which is connected to an aspiration evacuation pipe for filtered water, not sho~n.
At the downstream end, the ilter comprises a hydrodynamic device assisting the free evacuation of all impurities carried by the current, as will be descri~ed below.
` The water to be filtered penetrates from the exterior of the strainer through the longitudinal slots 17, and the filtered water is evacuated via the eblow pipe ànd flange 18. According to hydraulic laws confirmed in practice, the water penetrates into the filter ~rom the begining (i.e.
upstream end) of the slots 17, hence by the finest part of the filter.
When, following a period of rough water for example, r
4-66~
the initial filtering zone becomes clogged, the filtering zone moves slightly downstream and consequently the water being filtered penetrates the filter by wider parts of the slots 17 and re-establishes a filtering equilibrium.
After the period of rough water having caused dis-placement of the filtering zone by clogging of the slots 17, the difficulty of filtering disappears and, when the impurities having clogged the narrowest part of the slots 17 have been swept away by the current, the filtering zone reassumes its initial place towards the narrow end of the slots 17.
The enlarging of the slots 17 from upstream to downstream facilitates cleaning of the strainer by the currentO
At the downstream end of the strainer where the non-filtered water carrying the impurities flows, a hydrodynamic de~ice 19 with two conical deflectors enables the impurities to be evacuated without them being able to cling to the end of the strainer. One of the cones, shown in broken lines, is disposed inside the strainer with its narrower end upstream, so as to form a deflector which assists the removal of the impurities. The other, external cone tapers in the downstream ~irection and prevents eddys.
Therefore, in the em~odiment of Fig. 1, the velocity of the water inside the filter is high and when water arrives and collides against the closed valve 10j velocity falls substantially to zero and correlatively, according to the principles of hydraulicsl the pressure in this area increases. Thus the water is compelled to go out of the filter passing through the right part of the filter (Fig. 1)~
In the embodiment of Fi~s. 2-4, an obstacle is formed by the frusto-conical part of the filter located left ~ of the section line 3-3 o Fig. 2. The water arriving with - a substantial velocity against this conical part produces, as .- ~.
~ _5_ , . . .
~Z~6~
is we~l known, ~ cavitation effect immediately after leaving the conical part and as a consequence a depression inside the upstream part of the filter is formed.
It is these two phenomenon of creation of a pressure (Fig. lj or a depression ~Fig. 2) which iscalled a dynamic effect. It is clear that this creation of a depression or thelike, takes place only if the velocity or speed of khe water is sufficiently high.
In the two described examples, the progesssion from a fine filtering to a coarser filtering - and vice versa - takes place automatically without any intervention:
there is a natural filtering equilibrium between the charge of impurities and the filtering threshold (fineness), the filtering zone moving to-and-for along the filtering element(s) as a function of these two parameters.
. ' ; ~
;~C -6-
the initial filtering zone becomes clogged, the filtering zone moves slightly downstream and consequently the water being filtered penetrates the filter by wider parts of the slots 17 and re-establishes a filtering equilibrium.
After the period of rough water having caused dis-placement of the filtering zone by clogging of the slots 17, the difficulty of filtering disappears and, when the impurities having clogged the narrowest part of the slots 17 have been swept away by the current, the filtering zone reassumes its initial place towards the narrow end of the slots 17.
The enlarging of the slots 17 from upstream to downstream facilitates cleaning of the strainer by the currentO
At the downstream end of the strainer where the non-filtered water carrying the impurities flows, a hydrodynamic de~ice 19 with two conical deflectors enables the impurities to be evacuated without them being able to cling to the end of the strainer. One of the cones, shown in broken lines, is disposed inside the strainer with its narrower end upstream, so as to form a deflector which assists the removal of the impurities. The other, external cone tapers in the downstream ~irection and prevents eddys.
Therefore, in the em~odiment of Fig. 1, the velocity of the water inside the filter is high and when water arrives and collides against the closed valve 10j velocity falls substantially to zero and correlatively, according to the principles of hydraulicsl the pressure in this area increases. Thus the water is compelled to go out of the filter passing through the right part of the filter (Fig. 1)~
In the embodiment of Fi~s. 2-4, an obstacle is formed by the frusto-conical part of the filter located left ~ of the section line 3-3 o Fig. 2. The water arriving with - a substantial velocity against this conical part produces, as .- ~.
~ _5_ , . . .
~Z~6~
is we~l known, ~ cavitation effect immediately after leaving the conical part and as a consequence a depression inside the upstream part of the filter is formed.
It is these two phenomenon of creation of a pressure (Fig. lj or a depression ~Fig. 2) which iscalled a dynamic effect. It is clear that this creation of a depression or thelike, takes place only if the velocity or speed of khe water is sufficiently high.
In the two described examples, the progesssion from a fine filtering to a coarser filtering - and vice versa - takes place automatically without any intervention:
there is a natural filtering equilibrium between the charge of impurities and the filtering threshold (fineness), the filtering zone moving to-and-for along the filtering element(s) as a function of these two parameters.
. ' ; ~
;~C -6-
Claims (9)
1. A high speed water flow filter, comprising:
- at least one generally tubular filter element having a wall provided with filtration passages, said element having at least one end open to water flow, - means for producing, at least during a filtration operation, a difference of pressure of the water inside and outside one end of said filtration element for compelling water being filtered to pass through said filtration passages around said end, - said filtration passages being formed of an increasing caliber in the axial direction of said filtration element, from the end where said difference of pressure is created towards its other end.
- at least one generally tubular filter element having a wall provided with filtration passages, said element having at least one end open to water flow, - means for producing, at least during a filtration operation, a difference of pressure of the water inside and outside one end of said filtration element for compelling water being filtered to pass through said filtration passages around said end, - said filtration passages being formed of an increasing caliber in the axial direction of said filtration element, from the end where said difference of pressure is created towards its other end.
2. Filter according to claim 1, further comprising means at the downstream end of said element, for controlling the flow of that part of the filtered water which flushes continuously the inner surface of said filtering element, said means comprising a body formed by two truncated cones having a common base, one of said truncated cones being located inside the central part of the downstream end of said filtration element.
3. Filter according to claim 1 or 2, wherein an aspiration pipe for the filtered water is arranged on the upstream end of said filtration element.
4. A high speed water flow filter wherein: at least one filtration element comprising a wall having a general tubular shape is provided with filtration passages in said wall, and is open at least at one of its ends; means for producing, at least during filtration operation, a difference of pressure of the water inside and outside one end of said filtration element, for compelling water being filtered to pass through the filtration passages around said end; the filtration passages being formed of an increasing caliber in the axial direction of the filtration element, from the end where said difference of pressure is created, towards its other end, the filtration element being made of a number of elongated rectilinear and parallel members arranged longitudi-nally with respect to the axis of the filter, said members having longitudinal slots therebetween for forming the filtration passages, said means for producing a difference of pressure comprising an exit pipe for the filtered water,connected to an open end of the filtration element and to aspiration means, to produce inside of said element, in the vicinity of said open end, a pressure lower than outside said element to aspire said filtered water, said open end being disposed upstream in the water flow, the opposite end being also open and disposed downstream in the water flow.
5. A high speed water flow filter, comprising:
- a generally tubular filter element made of elongated parallel members, - longitudinal slots in said members that increase in width from upstream to downstream end of said filter element, - said tubular filter element being open at its both ends to the water flow, - means at the upstream end of said filter element for producing a localized reduced pressure inside the filter element, and - an aspiration pipe connected at said upstream end of said filter element to remove filtered water.
- a generally tubular filter element made of elongated parallel members, - longitudinal slots in said members that increase in width from upstream to downstream end of said filter element, - said tubular filter element being open at its both ends to the water flow, - means at the upstream end of said filter element for producing a localized reduced pressure inside the filter element, and - an aspiration pipe connected at said upstream end of said filter element to remove filtered water.
6. A high speed water filter according to claim 5, wherein said filter comprise one tubular filter element having both ends open to the water flow,said filtration passages being slots along generatrices of said tubular element, said slots being progressively wider from upstream to downstream in relation to the flow of water to be filtered.
7. A high speed water filter according to claim 1, wherein said difference of pressure is created at the upstream end of said filter element.
8. A high speed water filter according to claim 5, wherein at said upstream end of said filter element there is provided a tapered frusto-conical part leading to an eblow pipe which is connected to said aspiration pipe.
9. A high speed water filter according to claim 5, 6 or 8 wherein said slots are longitudinal T-section profiled slots disposed in cylindrical configuration over said tubular filter element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA358,281A CA1125669A (en) | 1975-11-24 | 1980-08-14 | High speed water flow filter |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1521575A CH597894A5 (en) | 1975-11-24 | 1975-11-24 | |
| CH15.215/75 | 1975-11-24 | ||
| CA265,995A CA1092517A (en) | 1975-11-24 | 1976-11-18 | Highspeed water flow filter and method of filtering water in a graduated manner |
| CA358,281A CA1125669A (en) | 1975-11-24 | 1980-08-14 | High speed water flow filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1125669A true CA1125669A (en) | 1982-06-15 |
Family
ID=27164779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA358,281A Expired CA1125669A (en) | 1975-11-24 | 1980-08-14 | High speed water flow filter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1125669A (en) |
-
1980
- 1980-08-14 CA CA358,281A patent/CA1125669A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |