US1577309A - Boiler-tube-scaling device - Google Patents

Description

March 16 1926.

' s. SORENSEN.

BOILER TUBE SCALING DEVICE Filed Nov. 19. 1924 INVENTOR flit ohm ,S'p'rensen.

A'ITQRN EYS Patented Mar. 16, i926.

UNITED srArs srnrnan sonan snn, or NEW YORK, N. Y.

nortnRmonnsonLine :onv rcn."

Application filed November 19, 1924 Serial No. 750,893.

To all whom it may concern:

Be it known that LS'rnrirnN SoRnnsnN, a.

citizen of the United States, and a resident of the city of New York, Port Richmond,- borough of Richmond, in the county of Richmond and State of New York, have invalve; V

The invention is illustrated in the drawvented a new and Improved Boiler-Tube- Scaling Device, of which the following is a full, clear, and exact description.

This invention relates to a boiler tube scaling device. An object of the invention is to provide a device which can be ex A further object concerns the provision of means 7 whereby the reciprocating piston which forms the hammer 'carr1es substantially allthe ports for conducting steam or' impelling fluid to and from the steam chambers and thereby acts as its own slide ings, of which- Figure 1 is a section'taken on the line l1 of Fig. 2; I 1

Fig. 2 is a section taken on the. line 22 of Fig ' drawing s'is a preferred form, although it is Fig. 3 is a section taken on the line 33 of Fig. 1; and I Fig. 4. is a plan view of the device with a portion of the top plate cut away to show the locking device therefor.

The form of the invention shown inthe understood that modifications in the construction, and arrangement of the parts and in the character of the materials used may be adopted without departing from the spirit of the invention as set forth in the appended claim.

In its general. aspect the invention comprises a scaler including a head portion adapted to :be inserted within a boiler tube or similar location. This head portion contains a cylinder within which a piston is adapted to reciprocate. Thispiston is provided with hammerlike stems projecting from opposite sides thereof, whichencounter the walls of the tube as the piston is reciprocated by the impelling fluid.

The walls of the cylinder are provided with a plurality of grooves acting as steam eras-r; omen admission'and exhaust grooves. The admission groove is connected to an admission pipe, and the exhaust grooves are connected by passages leading to the exterior of the body portion for the discharge of the fluid.

These-grooves arepreferably circular and canbe easily and economically formed within the walls of the cylinder. The piston itself is provided with a plurality of ports andpassages which are so related to the groovesin the cylinder walls and the steam chambers formed at the ends of the cylinder that the flow of the steam is controlled by these ports in the piston due to the movement thereof. In view of the fact that the pistonis removable the ports therein can be very readily formed, whereas if it were required to machine the cylinder wall with anything but radial ports the manufacture of the device would be muchmore expensive.

It is for this purpose, therefo-re,that I provide the piston itself with thesteam ports,

iwhich ports, by reason of the movement of the piston, are opened and closed to control the flow of the fluid.

The preferred form of the invention as shown in the drawings comprises a body portion 1 within which is formed a chamber 2 actingas a cylinder. Within this cylinder a piston 3 is adapted to reciprocate. .This

piston: at its oppositeends is providedwith hammer stems at and 5 which project through suitable openings in the end walls 6 and 7 Preferably the end wall 6 of the cylinder is in the form of a cap which is screwed intothe body portion and can be removed. This cap along its edge is provided with a bore 9 into which a pin 10 extends.

tendin r to force the pin out of the bore. This pin is adapted to engage with shoulders suchas 12 formed in the upper surface of Back ofthis pin, within the bore 9, is a spring 11' circular groove .1 to which an inlet port 14 connects, this port leading to a passage 15 formed in a lateral hose ll formed on the side oi the body portion l and into which an inlet pipe l? is suitably threaded. The circular groove 13 in the cylinder centrally disposed with respect to the path of movement ot the piston and with respect to the length of the cylinder, and is the admission groove for the impellii'lg t'luid. On opposite sides oi this admission groove are two grorn'cs l8 and 19. These grooves are crhaust grooves and are connected to the exterior ol? the body portion by a plurality of exhaust passages such as leading to the exterior of the hody portion. At opposite ends of the cylinder steam chambers 21 and are formed. The body portion of the piston 3 is provided with a plurality of steam passages, such as 28, extending longitudinally ofthe piston. Each of these pasconnects at its inner end with a radial passage such as 2t leading to the periphery of the piston. It is to he understood, how ever, that certain of these passages E23 extend toward one end of the piston and certain others, preferably an equal number, extend toward the opposite, end of'the piston and open thereinto. Any of the steam passages which open into one end of the piston have their connection with the radial ports Pal on the opposite side of the center line of the piston, consequently, the steam passages 23 which open into the other end of the piston have their connections to the radial passages 24 on the opposite side of the center line of the piston. By reason of this construction, it will be observed from a consideration of the drawing that whenever the. piston is at either end of the cylinder certain of the radial ports ill formed therein are in. alignment with the fluid admission groove 13.

In the operation of the device, therefore, assuming that the piston is in the )osition shown in Figs. 1 and 3, the steam will enter the pipe 17, pass through the inlet port 14, into the admission groove 13. It will pass from this groove into the plurality of radial passages M which happen to be aligned therewith in this position of the piston, and willpass down the steam passage: J3 to the lower end of the piston and enter the lower steam chamber 21. This fluid, which may be steam, will then force the piston outwardly. As the piston travels up, the radial passages 2 1 will be closed off from the groom l3 and will he connected to the exhaust groove 18 and, at the same time, the lower end of the steam passages 23 will be open to the exhaust groove 19, so that simultaneously the at am or impelling fluid trapped in the chamber 21. and in the passages as and the ports 2-1: will be exhausted rapidly. This exhaust action will tend to act in such a manner as to clean the surface of the holler tuhe adjacent the device because oil the pressure under which the fluid is released from the cylinder. As the piston reaches the opposite end of its stroke from that; shown in Fig. 1, the other side of the admission ports :24 are brought into alignwent: with the admission groove 113, thus causing the steam or lluid to he admitted to the opposite end of the cylinder, acting on the other end of the piston to more it in the reverse direction, whereupon a similar cy .ie of operations takes place.

It: will thus be observed that in-so tar as the llow and control oil. the steam is concerned, all at the ports and passages which lead steam from the inlet groove to the steam chambers 1 id from the steam chamhers to the exhaust groove are carried by the piston, and since this piston can he removed from the cylinder, it is a relatively economical matter to machine and here the piston, the only machining required to be applied to the cylinder walls being to form the grooves ahove mentioned therein and drill the radial ports, 14-, 20, a matter which is relatively economical. In other Words, the piston itself acts as its own slide valve.

\Vhat I claim is 1- A body having a cylinder therein, said cylinder having a central fluid admission groove and fluid exhaust grooves, passages on opposite sides of the admission groove, said cylinder having steam chambers at o ngosite ends thereot, a reciprocal piston disposed in said cylinder. said piston having axia spaced radially disposed rows of ad till BS1011 ports adapted to be respectively aligned with the admission groove in either extreme position of the piston within the cylinder, and with the exhaust grooves at intermediate positions of the piston and passages leading from said ports to opposite ends of the piston, whereby motive fluid is delivered to and exhausted from the steam chambers through the piston, said piston in its movement acting as a slide valve to control the flow of fluid.

STEPHEN SORENSEN.

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