GB2203960A

GB2203960A - Filter element

Info

Publication number: GB2203960A
Application number: GB08808480A
Authority: GB
Inventors: Koichi Arai
Original assignee: Arai Machinery Corp
Current assignee: Arai Machinery Corp
Priority date: 1987-04-22
Filing date: 1988-04-11
Publication date: 1988-11-02
Anticipated expiration: 2008-04-11
Also published as: JPH0611371B2; KR880012260A; KR930001599B1; DE3812927A1; JPS63264113A; DE3812927C2; GB8808480D0; GB2203960B; CN88102418A; FR2614216A1; CN1011483B; FR2614216B1

Description

0 39 60 CYLINDRICAL ELEMENT FOR FILTERING AND SEPARATION The present

invention relates to a cylindrical element for filt ering various subs.tances and separating particles.

Conventional, well-known cylindrical elements in this type generally assume a structure provided.

with net"like or lattice-like filtering holes.

Porous elements using ceramics have recently been developed.

The former structure ppovided, however, with point-filtering holes results in small filtering area, leading to significant c.logging!..phenomenon. There is a problem in that the smaller the particle size to be filtered, the mote remarkable the phenomenon is.

On the other hand, the latter structure compdls the porous structure-to performthree-dimensional filteri ng, such-that impermeable foreign matter grows as a clog in the porous structure. resulting in unavoid able reduced filtereing quantity. Accordingly, the foreign.matter in the. porous structure should be frequently 2 removed completely by means of cleansing.

The present invention is performed in view of the above problems. It is an object of the present invention to provide a cylindrical element for filter- ing various substances and.separating particles wherein a wire is cylindrically wound in the form of a vortex to form a vortical slit between the adjoining peripheral margins of the wire thereby increasing the area for filtering or separation treatment.as so- called linear treatment holes to the utmost to improve the filtering or separation efficiency.

The cylindrical shaped construction requires the treating area, larger than those for planer elements, f or a liquid to be treated such as a liquid or is a gas from the inside to the outside. In addition, because the holes for filtering or separation treatment is vortical slit holes, so-called linear treatment holes are formed to improve the flow of filtering.

The treating operation can smoothly be conducted because any residue such as filtered waste can be removed by single o perations such as back-wash of a fluid to be'treated from the outside to the inside -3 or-scraping by means of a scraper.

Fig 1 is a partially cutaway side view showing one embodiment the cylindrical element for Xiltering and separation in the present i ention Fig. 2 is a main body partially enlarged perspective view of the above; Fig. 3 is a partially enlarged cross-sectional view In a-state whichthe w ire on the main portion is removed; and Fig. 4 is a cross-sectional view along the lines IV-W of the above.

one embodiment- of the- present invention is described below- with reference to the drawings-.

A cylindrical frame plate 1 of which the surface is. generally cylindrical is composed of annular members 2 and 3 in the- same shape and provided at both ends thereof, and a plural number of support frames 4 provided there-----'- between.'. -.-.V6rtiCal:. --.and ".diS'Crete..:. -locking.. grooves 1 5... are cut precisely and at a definite pitch - 4 from one side of the cylindrical frame plate 1 to the other side thereof. A wire 6 is vorticall y wound along the locking grooves 5 while being engaged therewith. Both ends of the wire 6 are in engagement with a concave grooves 7 perforated on the annular grooves 2 and.3, respectively, and are secured thereto using a locking device 8 such as a machine screw thereby enabling being attached thereto.

The wire 6 has a cross-section of an equilateral triangle and the engaging grooves 5 are perforated in the form of V in agreement with the form of the top of the wire 6 so as to be capable of obtaining a vortical form. The adjoining surfaces of the wound wire 6 are formed in the"sane cylindrical curved surface for enabling the formation of a smooth curved surface P.

Vortical slit holes 9 with uniform intervals can be provided between the adjoining peripheral margins of the wire 6 which is vortically wound. The precision of the slit holes is 'first determined by the processing precision of the wire 6 and the cutting precision of the vortical engLging grooves 5 into the cylindrical frame plate 1 and finally.de termined by the winding operation of the wire 6.

When the wire 6 with a cross-section of an equilateral triangle illustrated by the embodiment - - -5 - gi7en in the drawing is used, the precision of-the widths of the slit'holes is:below 1 micrQny-. hot to mention-that from several td scores of microns.

The elements of the wire 6 and the cylindrical frame plate 1 may.be not only metals but also other preferred materials such as plastics or ceramics.

The action is-described based on the above structure.

The smooth curved surface P formed in the inside by means of- the vortical wire 6 is directed to the primary side as illustrated--in Fig. 1 and fixed to a pip e using the annular-member 2 and 3 on the outer periphery and a desired-fluid to be treated (a liquid or a gas) is allowed to pass toward the slit holes 9 in the direction of the arrow marks.

The residues, which are larger than the widths of-the slit holes 9 and enabled-the filtering and separation thereof, are removed from the fluid for filtering several substances and separating particles and any fluid-containing particles smaller than the 20, widths of the slit holes.9 is allowed to, pass through th e-holes to be-capable of so-called filtering and separation- -The residues which are filtered and separated 6 therefrom are piled lip on the smooth curved surface P on the inside of the cylindrical surface of the wire 6 but can easily and accurately be cleaned by the fluid from the reverse direction (the secondary side) by means of back-washing or. a.scraper (not shown) such that successive filtering and separation can be performed as is desired.

Although one embodiment of the present ivention is described, it is.needless to say that the above cylindrical frame plate l.may use a flat plate on whith-:a number of holes.are provided, a lattice net plate, and a drainboard (not shown), all of which are processed in the form of a cylinder instead of the support frames-4 and the locking grooves 5 can be formed as grooves which can be in agreement with either form of the cross-section of the wire 6 which is vortically wound according to-the'form of the cross section thereof, such as a circle, an ellipse and a trapezoid.

Means for'fixing and securing the cylindrical frame plate 1 to the wire 6 to be wound may use preferred methods such as driving by means o f a setscrew, spot fusion, and adhesion by means bf an adhesive at each portion.-in addition to fixation of both ends by means of the locking member 8 in the above embodiment or 7 instead of both end fixation.

ccorcling to the present invention, slit holes can be formed on the cylindrical frame plate by means of the vortical wire in a flat state thereby m. arkedly:lhcr(pasing the volume of treatment such as filtering-and se aration as so-'rcalled linear treatment p holes. The slit holes themselves can vortically be formed.by the adjoining.gaps between the wire which is vortically wound, such that the widths can be determined precisely for enabling highly precise filtering and'separation operations.

Because the element is formed"as the curved surf-ace of the entike inner surface and a liquid to be treated can be allowed to flow from the so-called inside to -the outside, it can be used with wide exchangeability as a permanent filtering and-separation element instead of various disposable filters.

8

Claims

CLAIMS:- (1) A cylindrical element for filtering various subs-tances and

separating particles comprising vortical, discrete locking grooves directing from the one side to the inside of a cylindrical frame plate provided with a porous structure to the outer.,.pe&ihery thereof, in the locking grooves which the margin of the outer periphery of a wire processed in a desirable cross sectional form is engaged and locked to form vortical slit holes between.:the!peripheral margins of the adjoining wires.

(2) A cylindrical element for filtering various substances and separating particles in accordance with Claim 1 wherein said cylindrical frame plate with a porous structure is composed of two annular members of the same shape and a number of support frames.

(3) A cylindrical element for filtering various substances and separating particles in accordance with Claim 1 wherein said vortical locking grooves have V-shaped cross-sections and are in agreement with the top of the wire with a cross-section in the form of an equilateral triangle.

(4) A cylindrical element for filtering various substances and Separating particles, subsrantially as hereinbefore described with reference to the accompanying drawings.

An element for filtering various substances and separating particles comprising a plurality of vortical, discrete grooves formed in the inner surface of a cylindrical frame of hollow formf with wire disposed in the grooves so as to form vortical slits between adjacent portions of the wire, Published 1988 at The Patent Office, State House, 66/71 EUh Holborn, London WC1R 4TP. Further copies may be obtained from The Patent OMce, Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mar7 Cray, Kent COn. 1/87.