US2457122A - Cell type filter element - Google Patents

Description

@ma z 3194@ v D. Umm' y ZAWZZ y CELL TYPE FILTER ELEMENT Filed June 27, 1947 Patented Dec. 28, 1948 erica CELL TYPE FILTER ELEMENT George D. Burley, Cleveland, Ohio, assignor, by mesne assignments, to Fram Corporation, East Providence, R. I., a corporation of Rhode Island Application June 27, 1947, serial No. 757,630 claims. (ci. 21o-169) This invention relates to a cell type lter element for collecting contaminant from liquids to be filtered therethrough.

In the use of a cell type filter element such as that made from some porous stock, such as paper, different shapes of members stacked one upon the other have been provided. In many instances, the shapes become complicated an'd thus the cost of cutting out tools for producing the same is expensive. Also, in the more complicated types of sheet members, the structure may be weak in parts and thus apt to rupture. Also some warping l,of the plates at the ends of a stack of sheet members is apt to occur due to expansion of the members if the stack is supported near its outer periphery.

One of the objects of this invention is to provide a shape of sheet member which may be used in one form throughout the stack, thus making unnecessary the formation of two shapes for the use in the element.

Another object of this invention is to simplify the shape of each of the filtering members of.

identical conguration to reduce cost of dies or the cutting out tools for the members.

Another object of the invention is to provide a more rugged shape of sheet member for serving in the stack of members.

Another object of the invention is to provide an arrangement of members in the stack with a support therefor so that the possibility of warping the end plates of the stack is reduced to a minimum.

With these and other objects in view, the invention consists of certain novel features of construction as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a sectional view of a filter, showing the clement in position in the case;

Fig. 2 is a perspective view of one o; the sheet members of the element;

Fig. 3 is a top plan view of two or more oi the sheet members piled one on top of the other.

In proceeding with this invention, I form in any suitable manner, such as by cutting out from a sheet stock filter medium which may be paper or cardboard, a member of the shape shown in Fig. 2 and by oppositely positioning these members in piling them one upon the other so that openings through the members will register, I provide a stack. The area about the opening is of rugged structure and provides the location where pressure may be exerted by expansion of the members and at' this location I support the end plates by means of rods which serve to locate as well as to tie together the stack of members at a Well supported location.

With reference to the drawings, i@ designates a metal case usually of cylindrical construction. although not necessarily so, which has a center tube i l secured to the bushing l2 whose flange i3 is welded to the outer bottom oi the casing.l This bushing is threaded as at ld 4for connection to a conduit for leading the filtrate from the casing. A drain plug l5 closes' an opening i@ through a boss il also in the bottom portion of the lter. An inlet opening is designated i8 and is threaded for connection to a conduit to supply contaminated liquid to the casing. The cover l@ is sealed upon the upper edge of the casing by gasket 2t and is held in position by headed screw 2l having threads at 22 to engage the innerI surface of the upper end of the center tube il.

The lter element aboutwhich this invention centers is designated generally 25 and consists of a plurality of sheet members 26 shown in perspective in Fig. 2. In this particular case, the outer periphery of the member 26 is circular so that the element 25 is generally cylindrical, although other shapes may be provided. The sheet member 26 is formed of any suitable filter medium such as paper, chipboard, cardboard, or of a felted mass, of a weight which will be sufficient to be selfsupporting so that the member may extend generally horizontally without drooping or bending so as to maintain a space between it and like members spaced from it. The paper, chipboard or other lter lmedium of this member will transmit nitrate through it in the plane parallel to its surface. The outer edge of this member 26 designated 21 is the shape of a half circle and covers an arc of substantially degrees from the center of opening 28 so that the portion which extends from the opening 28 forms a web portion 29 as shown in Fig. 2. There is also provided in addition to the half circular area a radiating portion 30 which surrounds the opening 28 with sumcient stock so as to provide a good rigid part of the member 26 which will not easily break out between the opening 28 and the edge of this portion 30. The opening 28 is illustrated as rectangular and serves by reason of this shape for the initial alignment of the members when in stacked relation. The distance'between the corner 3i and the periphery 32 of this portion 30 is the shortest distance from the periphery to the opening and thus serves as the point of initial filtering through the paper stock of the member.

The members 28 are stacked alternately in op- 3 posite relation with reference to the long axis of the rectangular opening 2l so that the rectangular openings in adjacent and contacting members will be in alignment and by reason of this stacking there is providedl cells 35 between the web portions 29 of the members on either side oi the diametrical line through the long axis of the rectangular opening 28. In order that the stack may be maintained in alignment and also held in assembled relation, openings $8 are provided in each of the members 28 on one side of the opening' 28 and notches 31 are provided in the portion 30 on the other side of the diametrical longitudinal axis of the opening 2l for the reception of tie rods. y

A bottom plate 38 is provided for one end of the stack and a top plate I9 provided for the other end of the stack, which plates are flanged as at 40 to extend overV the peripheral edges oi' the stack. Rods ll extend through the aligned openings 3S and notches 31 and are tied at their ends by means of heads 42 and members 43 so as to maintain the stack of members in substantially the position in which they are located while also preventing the members from expanding due to liquid absorbed. A reinforcing end plate 50 at each end may be used. This manner of placing the rods 'Il closely adjacent the center of opening '28 and through the large supporting area and the overlapping parts of the members 28 serves to very nicely and eilectively support the stack and hold it againstrwarping.

The stack with its end plates is assembled over the 4center tube Il and rests upon an abutment 45 at the lower end and is pressed downwardly onto this abutment by a spring I6 acting between the cover and the other end of the element. Liquid which surrounds the element will pass in through the cells between the portion 29 of the members 26 passing through the members 28 and to the center opening 28 and thence out animas through opening Il in the center tube downward. 1y from the center tube and out of the nlter. This opening 41 also maintains the level of oil in the casing when the circulation to the casing stops.

.The die is very simple for cutting out the sheet members which form the structure.

I claim:

1. A cell type illter element comprising a stack of sheet members of identical conilguration, each member having an opening for registering with a like opening in the next member, and each member having a web portion radiating from said -opening throughout substantially of arc from the center of said opening to the periphery oi said element and radiating a lesser amount oppositely to enclose said opening, adjacent members being oppositely disposed to form cells between like positioned members on opposite sides of a diametrical line through the center axis of the element and with the portions surrounding the openings overlapping to provide the cell spacing.

2. A cell type lter element as in claim 1 wherein said members are each self-supporting.

3. A cell type iilter element as in claim l wherein said openings are out o! round in shape to provide a means for aligning said members.

4. A cell type filter element as in claim 1 wherein rods extend through said stack of members between the periphery of the element and the center of said opening and through a portion of each of said members.

5. A cell type lter element as in claim 1 wherein rods extend through said stack of members betweenthe periphery of the element and the center of said opening and through a portion of each of said members where they overlap.

GEORGE D; BURLEY..

No references cited.

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