US2770369A - Liquid purifying filters - Google Patents

Description

c. W. HULSBERGEN LIQUID PURIFYING FILTERS Filed April 1.4, 1953 United States Patent LIQUID PURIFYING FILTERS Cornelis Wichert Hulsbergen, The Hague, Netherlands Application April 14, 1953, Serial No. 348,644

3 Claims. (Cl. 210-171) For use in a liquid purifying filter, filter bed flushing means have been proposed, comprising a series of flushing nozzles each screwed into a sleeve embedded in a nozzle floor and each having associated with it a plunge tube downwardly extending from said sleeve into the space below said nozzle floor, said nozzle having radial outlet slots and being composed of two equally and similarly shaped circular sections each carrying a series of axially extending uniformly spaced projections or teeth along their outer circumference such teeth tapering towards their free end and being so dimensioned, that upon assembling said sections by inter-engaging said axial teeth, gaps or slots are left between the side faces of said interengaging teeth.

This known construction is particularly designed to provide a nozzle consisting of two identical nozzle sections enabling such nozzle to be easily and inexpensively manufactured particularly when pressmoulded from glass or synthetic materials.

In this known structure, however, the depth to which the teeth of one section should enter the gaps between the teeth of the other section so that the outlet slots are of the required width, is determined by a number of axially cooperating stops arranged inside or outside said series of teeth and all or in part also tangentially cooperating. This means that when assembling the nozzle sections by axially inter-engaging the two series of teeth, special care has to be given to the relative angular position of such nozzle sections, to assure the correct axial coincidence of said stops, as otherwise the slots between the successive inter-engaging teeth disappear.

In connection therewith the present invention has for its object to provide means enabling the nozzle sections to be correctly assembled regardless of the attentiveness or skill of the operator.

To this end, according to the present invention, the projections of both nozzle sections are locally enlarged particularly at their tips or roots or both, and to such an extent, that in assembling the two sections, the tips of the teeth of one section are jammed between the roots of those of the other section and thus the desired width of the slots is automatically obtained. It is therefore unimportant in what relative angular positions the two nozzle sections are assembled.

The invention will hereinafter be further described with reference to the accompanying drawings, in which:

Figure 1 is a side elevational view of an assembled nozzle according to the present invention and mounted in a nozzle floor of a liquid purifying filter, the respective portion of such floor being shown in cross-section.

Figure 2 is a plan view of such nozzle.

Figure 3 is an exploded sectional view of the various components of the nozzle structure according to the invention and Figure 4 shows the upper nozzle section seen from below.

Referring to these figures, Figure 1 shows the improved nozzle structure in operative position in a nozzle floor 2,770,369 Patented Nov. 13, 1956 and screwed into the internally threaded upper portion of a sleeve traversing said nozzle floor and having arranged therein a downwardly projecting plunge tube held in position in said sleeve by the clamping action of a ring of rubber or the like resilient material surrounding said tube and being confined in a downwardly tapering chamber formed in the lower portion of said sleeve, all as described in my copending U. S. patent application Serial Number 192,027, filed October 25, 1950, now Patent No. 2,711,829.

As more particularly shown in Figures 3 and 4, according to the present invention, the nozzle proper consists of two equally and similarly shaped sections 1 each comprising a circular series of axially extending projections in the form of truncated circular cones 2 having an enlarged root portion 3, such cones being integrally formed with an annular carrier 4 of which the centrally located opening 5 is defined by a portion 5 of a spherical surface. The enlarged root portions 3 of said cones are so dimensioned that when, in assembling the two sections, the tips of the cones of one section are jammed between the enlarged root portion 3 of those of the other section, the slots defined by the mantels of the cones have exactly the required width.

A further component of the nozzle is formed by a specially designed screw bolt 6 serving both for locking the two sets of cones in inter-engaged condition and for securing the nozzle in position in the nozzle floor.

This screw bolt 6 has a head 6' and a hollow stem 6 radially slotted to provide lateral outlet passages 6 for the flushing agent, such stem being provided with external screw threads 6 fitting the internal screw threads 7 of the sleeve 7 which is embedded in the nozzle floor 8 and contains the plunge tube 9 introduced from above, such tube being held in place by the lateral clamping action of the resilient ring 10 as stated above.

By screwing the bolt 6 into the sleeve 7, as a result whereof the lower face of the bolt stem 6 accurately adjusts the plunge tube 9 to the required height, the nozzle constituted by the two inter-engaging series of cones 2 is rigidly secured between the upper face of the nozzle floor 8 and the lower face of the head 6 of the screw bolt 6 which lower face is shaped complementary to the wall 5 of the passage 5 of the upper carrier 4, so that a centering and liquid tight connection is assured. The stream of flushing liquid or liquid and air, during the operation of the filter or the flushing of the filter bed passes through the central plunger tube 9 and the hollow slotted stem 6 of the bolt 6, into the usual filter material (not shown) constituting the filter bed.

From the above it is clear that the present invention provides for a novel and efiicient flushing nozzle for use in the nozzle floor of a liquid purifying filter, which nozzle may be easily and inexpensively manufactured and may be readily assembled by unskilled persons without requiring any special care as far as the relative angular position of the two nozzle sections during such assembling is concerned, the correct width of the outlet slots being obtained automatically in all relative angular positions of the nozzle sections.

It is obvious that the local enlargement of the cones or other projections may also be located at the tip of such projections or even both at the tip and at the root thereof, the embodiment shown, however, being advantageous in view of the manufacturing and the assembling of the nozzle sections.

What I claim is:

1. A nozzle for use in liquid purifying filters comprising two identical nozzle sections each having an annular base, a circular series of outwardly tapering elements integral with and axially projecting from said base and uniformly spaced to an extent somewhat exceeding the width of such elements, said nozzle sections being coaxi-ally assembled so that the elements of one section interengage with some lateral clearance with those of the other section, and means for locking said sections in said relative position comprising at least one local enlargement on each said element so dimensioned, that in coaxially assembling said nozzle sections, the tips of the elements of one section are jammed between the roots of the elements of the other section to thereby define the width of the outlet slots formed by the lateral clearance of the inter-engaging elements.

2. A nozzle for use in liquid purifying filters comprising'two identical nozzle sections each having an annular base, a circular series of outwardly tapering elements integral with and axially projecting from said base and uniformly spaced to an extent somewhat exceeding the width of such elements, said nozzle sections being coaxially assembled so that the elements of one section interengage with some lateral clearance with those of the other section, and means for locking said sections in said relative position comprising a conical enlargement of the root portion of each element of both sections of such dimension that in coaxially assembling said nozzle sections, the tips of the elements of one section are jammed between the roots of the elements of the other section to thereby define the Width of the outlet slots formed by the lateral clearance of the inter-engaging elements.

3. A nozzle as claimed in claim 2 wherein the annular base of one of the sections defines a seating and said means for locking said sections comprises a first separate portion adapted to be inserted through the annular bases, said first separate portion having a threaded end and an end opposite thereto for engaging the seating, and a second separate portion for engaging the threaded end and defining a hollow stem with a necked down portion, said nozzle further comprising a tube inserted in said hollow stem and resilient means therearound for supporting said tube on said necked down portion, the threaded end of said first separate portion engaging an end of said tube whereby the position of said tube is adjusted in accordance With the threaded engagement between said first and second portions.

References Cited in the file of this patent Bakker Oct. 23, 1951

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