US2377598A

US2377598A - Boiler tube scraper

Info

Publication number: US2377598A
Application number: US408362A
Authority: US
Inventors: Zilliox John
Original assignee: RAYMOND G BLENDINGER
Current assignee: RAYMOND G BLENDINGER
Priority date: 1941-08-26
Filing date: 1941-08-26
Publication date: 1945-06-05
Anticipated expiration: 1962-06-05

Description

June s, 1945. t, J. LUOX l 2,377,598

BOILER TUBE SCRAPER Filed Aug. 26, 1941 Zhi/vena;

Patented June 5, 1945 UNITED STATES PATENT oFFlcE BOILER TUBE SCRAPER `John Zilliox,`rchard Park, N. Y., assigner to Raymond'G. Blendinger, Buffalo, N. Y.

, Application August 26, 1941, Serial No. 408,362 I This invention relates to certain new and useful improvements in tools for cleaning or scraping the tubes of boilers and the like.

It has for one of its objects to provide a tool of this character which is so designed and constructed as to eifectually and economically remove soot and scale from the tubes and at the same time burnish the tubes to a smoothness that will prevent such soot and scale from re-forming so quickly.

Another object of the invention is to provide a scrapingtool for boiler tubes and the like which may be operated by air, steam or water and whose scraper blades are so mounted as to automatically adjust themselves to the surface of the tube irrespective of its shape or condition.

A still further object is to provide a boiler tube scraper which is simple and inexpensive in con-I structiony which is durable and reliable in operation, and which promotes and maintains maximum boiler efficiency.

Other features of the invention reside in the construction and arrangement of parts hereinafter described and particularly pointed out in the appended claim.

In the accompanying drawing:

Figure 1 is a fragmentary side view, partly in section, of a boiler tube assembly showing my improved scraper in an operative position in one of the tubes. Figure 2 is an enlarged, central longitudinal section of the scraper. Figure 3 is a cross section thereof in operative position Within atube. Figure 4 is a fragmentary sectional view of the bladed end of the tool.

i By way of example, my improved scraper has been depicted in Figure 1 in an operative position in one of the tubes II) of the boiler tube assembly II, the numeral I2 indicating the body or casing of the scraper, I3 the scraping blades Whi-ch are adapted to rotatably bear against the soot or scale to remove such matter from the tube, and I4 in- The body I2 is substantially cylindrical and in its duid-receiving chamber I5 is a stator I'I whose flanged front end I1 abuts at its inner end against a forwardly-facing shoulder I8 formed in the body and whose peripheral face has a snug fit with the inner side of the body to form an air tight closure therefor. Bolts I9 serve to effectually secure the stator in place within the body, as shown in Figure 2, wherein it willbe noted that the front face of the stator terminates short of the front end of thebody for a purpose which will hereinafter appear.

Carried by and journaled in suitable bearings in the stator IB is the blade-carrying rotor assembly preferably consisting of a rotatable shaft or member disposed axially of the stator to rotate freely relatively thereto. Secured to the front end of this shaft, which may be in the form of a bolt to permit ready assemblage of the parts, is an impeller wheel 2I having obliquely-disposed vanes 22 projecting from its periphery, said wheel adjoining the front face of the stator and operat` ing within the front end of the body I2. A plurality of ports 23 are arranged in the statorflange 'I for directing the fluid medium introduced into the body I2 tangentially against the

rotor vanes

2,2 to rotate the impeller at a high speed.

Detachably mounted on the rotor assembly forwardly of the impeller wheel 2| are a plurality of scraper blades I3 which are free to respond to the centrifugal force developed by the high speed rotor and to be self-adjustable and directed rm- 1y into engagement with the boiler tube Walls to effectually scrapeand clean the soot and scale therefrom. By preference, two of such scraper blades a're provided and each consists of a body 24 terminating at one end in a laterally or obtusely bent scraper tip or face 25 and at its other end in a hinge-loop 26 pivotally mounted on a spindle or bolt 21 projecting forwardly from the impeller Wheel 2l at one side of its axis and disposed parallel therewith. As shown in Figures 2 and 3, a tie bar 28 connects both hinge-bolts 2l at their free ends and nuts 29 serve to removably retain the scraper blades thereon. Projecting forwardly from the face of the impeller wheel adjacent each hinge-bolt is a stop pin 30 which is disposed in the outward swinging path of the companion scraper blade to limit its movement in that direction and wherein its scraper tip 25 is disposed substantially radially of the tube, as shown in Figure 3. In this connection, it should be noted that the scraper blades are free to swing inwardly and are thereby self-adjustable to conform to the diameter of the tube bore as determined by its shape or by the degree of scaling thereon.

In operation, the tool is placed in the tube to be cleaned in the manner shown in Figure 1 and I the iiuid medium, whether air, steam or water is introducedinto the pipe I4 to impart rotation to the rotor blade assembly. The scraper blades I3 are projected by centrifugal force against the tube wall and in so doing cling thereto and effectually scrape the soot and scale therefrom. As the soot and scale is removed, the scraper blades automatically adjust themselves and are maintained in rm scraping contact With the tube at all times, and, When the soot and scale is removed, the tube is burnished smooth to thereby prevent soot and scale re-forrning so readily. The exhaust :from impeller wheel 2l serves also to drive the cleanings from the tube and prevents clogging. In Figure' 3 the scraper blades are shown by full lines in burnishing contact with the tube, While the dotted lines show the blades I claim as my invention:l

A boiler tube scraper, comprising a cylindrical body open at its front end and adapted for connection at its opposite endl to a source of uid pressure, a substantially spool-shaped stator member detachably mounted therein between the ends thereof with its front flange provided with ports and terminating short of the front end of said bodyin snug fitting `engagement with the inner Wall thereof andhitsjrear flange being free from contact with such inner wall of the body and serving as an attaching ange for bolt-conat the start of the cleaning operationv in contact `with the scale.

While manifestly simple, inexpensive-and durable in construction and positive and efficient in thoroughly cleaning the entire area of the tubes, this scraper tool promotes economy and maintains maximum boiler eiciency, and it'is -so designed that it can be readily assembled and dismembered and its scraper blades can be readily removed and replaced.

necting the stator member to said body, a rotor journaled in said stator member and having an impellermember detachably mounted on that end thereof forwardly of the front stator-flange and in enshrouded relation with the adjoining end of said body, and scraper elements mounted on thefront face of the impeller member.

J OHN ZILLIOX.