US2446463A - Stuffing box mounting for pumps - Google Patents

Description

Au .3,194s. y, EHRIG 2,446,463

STUFFING BOX MOUNTING FOR PUMPS Filed March 25, 1946 Q 4 V/c rozzCfl/a/ i V INVENTOR. I 5 iv i 2/ Patented Aug. 3, 1948 UNITED STAT FFICE Claims. 1

This invention relates to water pumps, especially the type employed in the water system of steam locomotives and it has particular reference to stuffing boxes and mounting therefor as used in such pumps.

Ordinarily, water pumps of the dual cylinder type as used to supply water to the boiler of a locomotive are equipped with stufiing boxes in the adjacent heads of the opposed cylinders, leaving substantially the entire head area exposed to the erosive eiiects of water with no provision for minimizing these destructive eifects nor for renewing the eroded parts in the pump. As a result, the pump often becomes ineilective in the course of a run, causing expensive delays in shipping and transportation as well as expense incident to replacement of a new and unknown pump.

It is the principal object of the present invention to provide a stuiiing box mounting for Water pumps which, while not immune to erosion, may be replaced in a pump in a minimum of time and has associated therewith a replaceable ring element adapted to overlie a vital part of the pump most Vulnerable to erosion to shield the same against premature impairment. Moreover, the ring element obviates the necessity for the replacement of the entire pump which is an expensive unit in the water system of a locomotive.

It is further an object of the invention to provide a stufiing box mounting for water pumps which is constructed for installation in conventional pumps with due regard for clearances with respect to assembled parts of the pump to enable the mounting to be installed without requiring that the entire pump be dismounted for the purpose. Moreover, provision is made for positively securing the elements of the improved mounting against accidental displacement, once they are assembled in proper relationship in the pump.

With the foregoing objects as paramount, the invention has further reference to certain fea tures of accomplishment which will become apparent as the description proceeds, taken in connection with the accompanying drawing wherein:

Figure 1 is a fragmentary side elevational view of a conventional water pump in vertical section. showing the stufiing box mounting of the invention installed therein.

Figure 2 is a view in transverse section, taken on line 2--2 on Figure 1.

Figure 3 is a top perspective view of a stufiing box per se.

Figure 4 is a top perspective View of the stuffing box mounting per se.

Figure 5 is a perspective view of the erosion resisting ring, and

Figure 6 is a top perspective view of a modified form of the invention in which the mounting and box are in a single piece.

Continuing with a more detailed description of the drawing, it is considered unnecessary to identify each. and every element of the water pump shown in Figure l in view of its conventional and well known construction, other than to point out that the piston rod ll), carrying pistons H in cylinders 12 is reciprocable through the intermediate stuifing box chamber [3. Each cylinder l2 has a liner it which is replaceable but the conventionally constructed pump has no provision for replacement of parts which become impaired by erosion caused by water impelled under great force at points adjacent to the lower; most stufiing box, centrally mounted thereon, resulting in leakage and consequent impairment in the efilciency of the pump. There is obviously no alternative, aside from the provisions to be hereinafter described but to replace the pump with an unworn substitute.

The invention provides a mounting consisting of an exteriorly threaded body [6 whose upper portion is tapered at a but whose lower portion b is straight walled, as shown, although threaded. The body Hi is provided with a central bore I! which is threaded at E8 in its upper end, as represented in Figures 1 and 4, to receive the threaded lower end It of the stuiling box 20. The stufling box 28 is shouldered at c, which shoulder bears upon the annular lip d surrounding the bore H of the body It.

An erosion shielding ring 2! is threaded upon the lower end of the body I6, said ring being interiorly threaded to conform to threads b of said body. Wrench recesses e are provided in the lower face of ring 2! to facilitate its installation and removal. A dowel or key 22 is likewise provided to be received in a bore made jointly in the threads I) of the body 16 and those of the ring 2! to prevent backing off of the latter.

To install the stufiing [box mounting described, the conventional stuffing box is removed and the partition I5 is reamed to obviate any trace of erosive action and afterwards threaded. Obviously, these threads are made to conform to the threads of the mounting body I6, which latter is then threaded into place in the manner shown in Figure 1.

To hold the body It in position, the ring 2| is threaded onto the lower end of the body by means of threads 12. When tightened in place, the dowel 22 is driven into the aligned parts of the bore made to receive it.

It is apparent from Figure 1 that the erosion shielding ring El may be passed through the liner M of the cylinder I2 without removing the said liner. This provision saves much time in assembling.

It is likewise apparent that when all parts are assembled as shown in Figure 1, water under high pressure will have little effect to impair the pump since all erosive action is borne by the replaceable shieldin ring 2! of the invention and the material of the parts is selected with a. view towards resisting erosion. However, should wear occur on these parts, replacement issimpleand inexpensive.

In Figure 8 is shown a slight modification of the invention. Instead of the parts being separately made and assembled, this figure shows the stuffing box and body id as being constructed in one piece, which after installing on the pump as previously described, is secured in place by the erosion shielding ring 2| exactly as .in the preceding instance. The same characters or reference are used to indicate like parts in the modir'ied form shown, to clarify their relationship.

Manifestly, the construction as shown and described is capable of some modification and such modification as may be construed to fall within the scope and meaning of the appended .claims is also considered to be within the spirit and intent of the invention.

What is claimed is:

1. In a water pump, a cylinder head, a stuffing box mounting comprising a body having a central bore, the upper portion of said body bein tapered and threaded for reception by a threaded opening in said cylinder head, the lower portion of said bodybeing straight walled and threaded, an erosion shielding ring mountedon' the lower portion of said body and bearingagainst the undersideof said cylinder headastuffing box em bracing the ce tr l b e of said body a d means for holding said shielding ring against rctative displacement on said body.

2. A stuffing box mountin for water pump,

comprising in combination with the cylinder head of said pump, a tapered and threaded body receivable in an opening in said cylinder head, a central bore and a threaded extension at its lower end, a ring threaded on said extension to bear against and substantially cover the opposite side of said cylinder head to-shield the same, means for holding said ring against rotative displacement and a stufiing b x disposed in the bore of said body.

3. A stuffing box mounting for a water pump including a cylinder head, an exteriorly tapered body retained in the piston rod opening in the cylinder head of said Water pump and having a center bore, a stufiing box in said bore, a threaded extension on said body, and a ring mounted ,on said extension to substantially cover and shield the face of said cylinder head.

A'device for resisting the erosive action of water on the cylinder head in a water pump, comprising in combination with said cylinder head, a stuflin box mounting consisting of a tapered and threaded body receivable in the piston rod opening of said cylinder head, a stuffing box supported by said head, and a ring threaded onto the lower end of said body whose area substantially covers the area of said cylinder head vulnerable to the efiects of erosion.

5. In a water pump, a device for resisting the erosive action of water on the cylinder head of said pump, comprising in combination with said cylinder head, a body having a central bore, a stuiiing box in said bore, said body further having a tapered and threaded exterior receivable in an opening in said cylinder head and a retainer ring whose area carries the vulnerable area of said cylinder head, receivable on the lower end of said body.

VICTOR C. EHRIG.

Name Date Blunt May 7, 1935 Number

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