US1671374A

US1671374A - Tube-coating apparatus

Info

Publication number: US1671374A
Application number: US43962A
Authority: US
Inventors: Charles F Moore; Charles H Stubbs
Original assignee: Dampney Co
Current assignee: Dampney Co
Priority date: 1925-07-16
Filing date: 1925-07-16
Publication date: 1928-05-29
Anticipated expiration: 1945-05-29
Also published as: GB255483A

Description

May 29, 1928.

C. F. MOORE ET AL TUBE COATING APPARATUS Fild July 16, 1925 2 Sheets-Sheet 1 lllllllllll Zi M3 C. F. MOORE ET AL TUBE COATING APPARATUS May-29, 1928. 1,671,374

Filed July 16, 1925 2 Sheets-Sheet '2 7 mun'lum 83 ouirrn srATa CHARLES F. MOORE AND CHARLES E. STUBBS, OF BOSTON, MASSACHUSETTS, AS-

SIGNORS TO THE DAMPNEY COMPANY OI AMERICA, OF

A CORPORATION OF MASSACHUSETTS.

BOSTON, MASSACHUSETTS,

I TUBE-COATING APPARATUS.

Application m a m 16, was. serial no. 43,962.

This invention in general relates to apparatus for applying a protective coating to the inside of boiler tubes and the like, and

its object is to provide an apparatus where I by the interior of the tubes may be coated,

in the nature of a painting operation, uniformly, efficiently, quickly and conveniently, and with a minimum amount of labor.

To these ends we provide a rotary brush and an air turbine adapted to enter the tube, and a source of compressed air and a moisture remover, conveniently located, connected with the air turbine by means of a comparatively stout, flexible, air conduit.

In the accompanying drawings,

Figure 1 is a general view of the apparatus, showing the brush and air turbine Fig. 5 is a sectional view of the air turbine taken on the line 5-5 of Fig. 2, looking in the direction indicated by the arrows;

Fig. 6 is a sectional view of the air turbine taken on the line 6.6 of Fig. 2, looking in the direction indicated by the arrows; Fig. 7. is a partial sectional view of the air turbine taken on the line 77 of Fig. 2,

looking downwardly; and v a t Fig. 8 is a sectional view taken on the line 8-8 of Fig. 2, looking in the direction indicated by the arrows.

Referring now to the drawings in detail,

40 in which like reference numerals designate similar parts throughout the several views,

10 denotes a boiler tube expanded atone end into the end plate 11. 1 The tube is prepared for the coating operationgby being thoroughly cleaned of foreign matter and in crustation's on the inher periphery of 'the tube. Then the coating, in liquid form, in

proper amount taking into consideration the lengthand diameter of the tube, is poured or squirted into the tube, conveniently by means of a device in the nature of a grease gun. and it then becomes the function of the apparatus of this invention to spread the coat ng uniformly over the entire inside surface of the tube. I I

. The brush, indicated generally by the reference numeral 13,is drivenby, a conventional air-turbine 14 which is connected at its intake side with the flexible conduit 15 leading from the moisture separator 16 which, in turn, is connected with a supply of compressed air.

In Figure 1 we have illustrated a compressor 17 having an air inlet 18 and a dis- 7 charge pipe 19 leading to a reservoir or storage tank 20 having a blow 03 valve 20 to maintain a supply of compressed air at a predetermined pressure.

The reservoir 20 mmunicates with the intake of the moisture remover 16 through a pipe line 21 in m which a control valve '21 is provided. The

compressor 17 may be operated in any conventional manner as, for example, by a motor 22.

Since the air turbine, when inuse, is 'inas side the tube, it follows that the exhaust therefrom is discharged into the tube. The compressed air in the reservoir or storage tank 20 will carr more or less moisture, and

perhaps oil, an if the exhaustfrom the so air turbine were tocarry such moisture, (16-, posit thereof on the inner surface of the tube would preclude the proper coating thereof since it is necessary that the coating be applied directly to the clean, dry and bare'metal of the tube. The present apparatus avoids the difiiculty and secures the designed and a specially advantageousge- 'sult. The compressed air in entering the moisture remover 16 follows thefpath indicated bythe arrowstherein. The. operation of the moisture remover per se is familiar to those skilled in the art. The current of entering air impinges upon the surface of the elbow 23 and causes a part of the Water in the air to accumulate on this surface. This water is drained from the surface through a ipe 24 and into the water space .25, from w rob the water may be removedairpasses downwardly, and this water is also discharged in the water space 25. The

air in passing'around the lower edge of the cylinder 29'is subjected to a whip-snapping clean air then passes out '0 the discharge po 31 which is connected to one end of the flexible tube 15.

The clean air, after it leaves .the moisture remover 16, is transmitted to the air turbine 14 by means of the flexible tube 15,

which is comparatively stout so that it may serve as a ban means and the end of which is threaded into the head 38.. v This 1 airturbine of generally cylindrical form and of such size that it may fit loosely within the. tube, may be of any conventional design.

The air makes its entry into the main housing 40 through the passage .35 and then passes through the two supply ports 1,0 and 37 (Figs. 2 and 5). Suitably journaled in the mam housing, in bushings 57 and 58, is a rotatable shaft 41 to which is secured intermediate its ends a rotor 42. This rotor 42 is positioned inside of a shell 43 (Fig. the boreof whichls elliptical in' sh'ape. As

*shown in Fig. 5, the apertures 36-and 37 which constitute the supply ports of the turbine are so designed 'as'to cause the rotor to revolve in the direction indicated by the arrows. Bligh rotative speed is imparted to housing 0 is a circular plate (Fig. 2

'j air an the ports 51 an the shaft 41 by theaction .of the compressed air behind the paddles 45 carried in slots 46 in the rotor in the ellipticalshel'l,

and two'of these paddles are always'unden pressure, the paddles alwa s tending to' move outwardly to follow t e interior surface of the elliptical-shell. Positioned intermediate one end of the rotor 42 and the a nipped with ports 51 and 52 (Figs.'6 and 73, which communicate with the exhaust 53 and 54' in the housing 40.. The entering the

supply ports

36 and 37, acts upon two ofthe paddles 45 causing.

the rotor 42 to revolve one-half arevolution. At the same the other two paddles are-brought into upon, and so forth. eair, after. having acted upon the caddies dischar throu 52 and'thee h aust ferrmg now tothe brush, 'piv'otally secured to the free end of the shaft 41 are a of

arms

71 and 72. The arm 71 has a pair of lateral @1573 and 74 and the arm 2 has apalr of lateral ears 75 and 76 which fit over the end of the shaft, and a pivot.

bolt 78 asses throu h these-ears and the end of t e shaft as own in Figure .8.

The

arms

71 and 72 are drawn 7 ther at 80 (F 1g 2). and then extend parall to each itioii to be acted -otherin an outward direction, where they are formed into channel portions 81- and-82, respectively. Mounted in each channel 18 a base 83 of a brush 84.

end of the'arm 72 is a lateral projection 92 which passes through theopening 91 in the projection 90. The end of the projection 92, indicated by 'referencenumeral 93 in Fig. 2,

is bent into a hook to catch within the opening 91 and limit the distance which the arms may be separated.

The brush as a whole is of a size to Qfit easily within the tube-and the construction and operation thereof is such that it will accommodate itself to varying sizes of'tubes within reasonable limits. It is apparent that when the shaft 41 revolves the

arms

7 ,1 and 72 and the brushes carried thereby will swing outwardly, due to centrifugal force, against the. inner wall or surface of. the tube 10. r T Y After the: coating, liquid form, has been, introduced into the tube as here inhefore described, the brush is in the end of the tube, using the conduit 15 as a handle. The valve 9-1 is then opened, to supply the compressed air and the brush revolves, the brush elements being pressed against the inner-surface of'the tube by centrifugal force. With the brush revolving, it is fed slowly up the'length of the tube and back again, and experience has demonacts as an agent 'to dry the spread coating,-

thus materially misting in even distribution and rapid rWe-claima 1. In combination, a tube apparatus, a rotor driven by fair, and a brush with radially extending bristles expansibleby centrifugal .force therewith and driven thereb for appl" a' coating to the inner perip cry of the tu both the brush and rotor be ng. adapted to enter the tube, the auexhaustof the said rotor to discharge into thesai u augmen drymgo ecoa' .japlied thereto by the said brush. p

2. A tube coating apparatus comperisinfi an air turbine adapted to enter a 'tu rotarybrush elements toand driven force.

3. A tube coating apparatus com r' an-air turbine adapted to enter a tube and carried on the endof a flexible air condu'i and rotary brush elements hinged 'to and by said turbine to separate by centrifugal I erner-a driven by said turbine to separate by centrifugal force.

I5 I an air turbine of generally cylindrical form 4.' A tube coating apparatus comprising an air t-urbine of generally cylindrical form adapted to enter a tube and carried on the end of a flexible air conduit of lesser diam- 4 ete'r than said turbine, and rotary brush elements hinged to and driven by said turbine to separate by centrifugal force.

,5. A tube coating apparatus comprising an air turbine adapted to enter a tube, and

a rotary brush hinged to and'driven by said turbine and having brush elements automatically moving outwardly when rotated. v, 6. A tube coating apparatus comprising adapted to enter atube and carried on the end of a flexible air conduit also adapted to ente' the tube, said turbine dischargingits exhaust into the tube, and a rotary brush hinged to the rotatin element of said turbine and having brus elements automatically moving outwardly when rotated. I

7. A tube coating apparatus com rising an air turbine adapted to enter a tu e and carried on the end of a flexible conduit adapted for connection to a source of com pressed air, and a brush expansible by centrifugal turbine, the exhaust from said turbine being restricted and discharging directly into the tube toward the wall thereof in proximity to said brush. a

In witness whereof, we hereunto subscribe our names, this 9th day of July, 1925.

a CHARLES- R MOORE. I v CHARLES 'STUBBS.

force carried and driven by said