Strainer

April 15, 1952

2,593,293

C. A. GIAUQUE

STRAINER

Filed March 4, 1948

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Patented Apr. 15, 1952

2,593,293

UNITED STATES PATENT OFFICE

2,593,293

STRAINER

Charles A. Giauque, Berwyn, Ill., assignor to Crane Co., Chicago, Ill., a corporation of Illinois

Application March 4, 1948, Serial No. 12,937

Claims.

This invention broadly relates to strainers and more particularly it is concerned with the novel construction of a strainer in which the straining element therefor is made of folded thin flat strips as hereinafter described in more detail after which it is wrapped around into a cylindrical shape with the adjoining ends welded or otherwise connected together.

Heretofore, one of the principal objections leveled against available constructions has been the requirement for making strainers largely in cast or welded material and therefore not only were the constructions relatively expensive but frequently were furnished inaccurate dimensionally with respect to the size and proportions of the apertures through which the liquid passes in the course of being strained.

Thus it is a further important object to provide a strainer construction in which the strainer is preferably fabricated entirely from parts capable of quick and convenient assembly and also possessing sufficient flexibility to form several sizes without substantial modification.

A further important object is to provide for a strainer formed by folding thin flat strips forming scallops or a series of undulations and capable of providing for Venturi outlets therebetween to facilitate the easy flow of fluid through the strainer thereby formed.

Other objects and advantages will become more readily apparent upon proceeding with the following specification read in light of the accompanying drawings in which

Fig. 1 is a fragmentary sectional view of the strainer embodying my invention.

Fig. 2 is a front fragmentary section taken near the center of Fig. 1 across several planes.

Fig. 3 is a side view of the folded thin flat strips constituting the strainer portion before being bent or rolled around to form the asssembled strainer.

Fig. 4 is a magnified fragmentary plan view of the construction shown in Fig. 3.

Fig. 5 is a fragmentary front exterior view of the folded thin strips taken on a rolled around section shown in Fig. 4.

Similar reference numerals refer to similar parts throughout the several views.

Referring at the outset to Fig. 3, a preferably continuous thin fiat strip of metal or other material is first cut to the desired length and then severally folded and corrugated transversely to its length in the manner illustrated to form an unbroken series of bends or serrations extending circumferentially, the folded strip thereby con(Cl. 210—169) stituting the strainer element, and being generally designated I. The number of folds is optional, depending on the closeness of the flow spacing desired and the length of the strainer element. 5' If the initially cut strip as referred to is not sufficiently long to provide for a continuous folded periphery during the course of being annularly positioned or wound about a spider 5, as hereinafter referred to more specifically, several strip 10 pieces may be joined together at complementary ends as indicated at 2 in Fig. 5. It should, of course, be clear that the type of material from which the thin fiat strip is made is not significant, since its selection depends largely upon the bend15 ability thereof and the service for which the strainer is ultimately to be used.

It should be understood, as shown more clearly in Fig. 1, that as to the oppositely disposed surfaces 3 and 4 of the folded strip I, line flow takes 20 place over the latter surfaces and between the folds of the strip. The flat strip when thus folded is annularly arranged about the spider 5, the latter element preferably having its longitudinal arms provided with the ports 6 and hav25 ing an annular shoulder at the top and bottom thereof, as at 7 and 8 respectively, for receiving and supporting the upper and lower rings 9 and ii. These rings preferably are weld sealed by means of the tack welds 12 and 13 to the rings 9 30 and 11 respectively. The latter rings are preferably provided with the grooves 14 and 15 to receive the upper and lower end portions 16 and 17 of the flat strips as indicated, the width of the grooves 14 and 15 being of about the same width 35 as the strip I, thereby to receive the folded portions of the latter member as stated.

It should be noted as shown more clearly in Fig. 4 that when the flat strips are multitudinously folded to form the many serrations and are 40 circumferentially mounted to extend around the spider 5, the interstices or spaces formed between the surfaces 3 and 4 are preferably of substantially radially extending form when viewed in the transverse section indicated at 18. It will, of 45 course, be appreciated that the latter form of passage is desirable in promoting increased fluid flow capacity therethrough.

The number and form of the folds and shape of the adjoining sections or surfaces will, of course, 50 vary with the service encountered.

It will be apparent that by simply folding a thin flat strip of desired width into a desired number of serrations or undulations, the folds or strip scallops can be spaced apart or drawn together 55 (accordion-like) to suit the nature of the liquid.

2,593,293 being handled. Thus, a relatively simple and inexpensive type of strainer can easily be made. It will also be apparent that by eliminating costly fabrication and providing instead for a flexibility commensurate with the type or character of liquid to be handled, it is a relatively simple matter to handle cheaply special orders for such strainers from time to time.

Thus it should be clear that the particular shape of the strainer structure and the detailed relation of parts may vary quite substantially throughout a wide range without departing from the principles hereinabove described. It is proposed therefore that the claims need not be otherwise limited.