US2225521A - Nozzle - Google Patents

Description

' Dec. 17, 1940. .1. E. HOLVECK NOZZLE Filed Nov. 22, 1938 Joseph Ehulveck l VENTOR ATTORNEY Patented Dec. 17, 1940 UNITED STATES PATENT OFFICE,

Application November 22, 1938, Serial No. 241,757

1 Claim.

In nozzles of this type it is highly desirable that the stream of liquid issue from the nozzle in as compact a form as possible, and with its flow uninterrupted so as to obtain maximum cutting action of the fluid.

The high velocity at which the water or other liquid issues from the nozzle causes considerable wear on the flow passage of the nozzle, particularly at and near the outlet end, and one object of the present invention is to provide a nozzle structure embodying a replaceable tip or outlet portion which may be easily, quickly and inexpensiveiy replaced when it becomes worn.

While the wear on the flow passage of the main body of the nozzle is not nearly as great as the. wear on the flow passage near the outlet,

nevertheless there is some wear on the main body, and since this wear varies in each individual nozzle, it is practically impossible to align the flow passage of a replacement tip with the flow passage of the nozzle body with the degree of accuracy needed to prevent distortion of the flow liquid and interference with its eillciency or to prevent the formation 0! vortices in the flow which result in cavitation of the nozzle, particularly at the joint of the replacement tip and body.

It is, therefore, an object of the present invention to provide a nozzle structure in which a worn tip may be replaced, and in which any 40 detrimental efiects on the fluid flow which might be caused by slight misalignment of the flow passages or by vortex-forming obstructions in the flow passage will be prevented.

With these and other objects in view, as may 5 appear from the accompanying specification, the

invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawing, showing a nozzle embodying the invention, and the features forming the invention will be specifically pointed out in the claim.

In the drawing: 7 V Figure 1 is a side elevation oi the improved nozzle. 1

Figure 2 is a longitudinal section through the nozzle. 1

Figure 3 is a cross-section taken on the line 3-3 of Figure 2.

Referring more particularly to the drawing, 5 the improved nozzle I consists of the main body 2, the detachable tip 3, and the coupling 4, providing in eflectl a two piece nozzle, the outlet portion oi the flow passage of which is formed in the tip 3 so that when the flow passage 5 of w the tip becomes worn to such an extent as to interfere with the proper discharge stream from the nozzle, it may be readily and easily replaced without requiring replacement of the entire nozzle. 15

The nozzle body 2 has a flow passage U, which tapers inwardly towards its axis uniformly throughout its length from its entrance end to its outlet end or exit end, where it' opens into the inlet end of the how passage I, formed in go the tip I.

The major portion of the flow passage 5 of the tip I is tapered at the same degree as the taper of the flow passage 6, and forms an aligning continuation thereof. However, near the outlet end of the tip 3, the passage 5 straightens out and is of uniform diameter for a short distance inwardly of the tip from its exit, as shown at 1. The outlet end of the tip 3 is provided with a countersink 8, which surrounds the out- 30 let end of the flow passage I so as to prevent sharp corners at the outlet end of the tip 3, for the purpose of reducing feathering" of the liq- "uid stream flowing from the nozzle.

The main body 2 of the nozzle is provided a with a countersink 8 in its outlet end concentric of the flow passage 8, and this countersink receives the inner end ofthe annular flange it formed upon the tip 3, so as to properly center the tip a relative to the body 2. The coupling 0 -member 4 is threadably attached to the body 2 and has an inturned flange Ii which engages the under side of the flange It for securely holding-the tip 3 connected to the body 2.

For the purpose of preventing the formation cl vortices or interruptionsto the flow of the high pressure liquid flowing through the nozzle it is necessary that the wall portions of the flow passages 5 and 8 be in accurate alignment, and that no part of the wall of the flow passage 5 50 projects inwardly of the wall of the flow passage 6 at the point of junction. The greatest wear caused by the flow of liquid or water through the nozzle is in the tip 3, because it is in this portion that the stream reaches its greatest rell duction in cross-sectional area, but nevertheless there is some wear on the walls of the flow passage 6, so that it would be impossible to make an accurate alignment of the flow passage of the tip 3 with the flow passage of the body 2 when a replacement tip was substituted for a worn one. This is rendered practically impossible, partially because wear on the walls of the flow passage 6 is never the same in two nozzles, and also because of the great'difiiculty in machining the flow passages 5 to accurately align with the flow passages 6 of a body to which the tip is to be attached, particularly since it is desirable and practical to manufacture the tips at the source of manufacture and supply them as stock items, for replacement. Therefore, for the purpose of permitting the use of stock tips for replacement, and to assure proper aligning of the flow passages of the replacement tip with that 01' the body, the flow passage of the replacement tip 3 is cut for a short distance inwardly from the entrance of the tip at an angle or taper greater than the angle or taper of the tapered portion of the flow passage of the body 2, providing an opening at the entrance end of the tip 3 which is greater in diameter than the diameter of the outlet end or exit of the flow passage 6, and which gradually tapers and merges into the tapered portion of the flow passag; 5. This in-' creased taper and enlargement of the flow passage 5 insures, first, accurate alignment of the flow passage 5 with the flow passage 6, and secondly, insures against any portion of the wall at the entrance to the flow passage 5 from projecting inwardly of the wall of the flow passage 6 at its exit end, even though the walls of the latter passage be worn, and thereby insuring the free and uninterrupted flow of the water or other liquid through the nozzle and preventing the formation of vortices at the joint between the body 2 and the tip 3.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that they may be widely modified within the invention defined by the claim.

' What is claimed is:

. A high pressure nozzle comprising a main body having a bore tapering uniformlyfrom its entrance to its exit and having the external surface of the body near the exit end of the nozzle screw threaded, a removable tip having an annular flange on its entrance end, said main body .being countersunk for receiving said tip, an attaching nut engaging the under surface of said flange and threaded onto said body for securely clamping the tip in engagement with, the body, the main portion of the bore of said tip tapering uniformly with the bore of said body to a point a short distance inwardly from the outlet end of the tip where said bore is of uniform diameter for a pre-determined distance, the bore of said tip at its entrance end being tapered at a greater angle than the angle of taper of the body bore to provide an entrance to the bore of the tip greater in diameter than the exit of the bore of the body, said tip having a countersink in its outer end to prevent feathering of liquid flow from the nozzle.

JOSEPH E. HOLVECK.

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