Easy insert tube cleaner

Abstract: A tube cleaner (1) that provides for easy insertion into an open end of a tube has a shaft (2), a nose portion (3) and tail portion (4), and a plurality of scraper devices (5) secured to the shaft (2). The scraper devices (5) are U-shaped and have a base (6) and at least two leg portions (7) which have terminal scraping sections (8). A tongue (11) is provided on the leg portion (7) which extends from the leg portion (7) rearwardly and outwardly to a position adjacent the scraping section (8) of the scraper device (5).

Description: The present invention is to a tube cleaning device for use in cleaning the inner wall of a tube or conduit according to the preamble of claim 1, and more specifically to a tube cleaner that is insertable into an open end of a tube, such as a condenser tube, and forced through the tube by a fluid, such as water, discharged from pressurized fluid gun to remove deposits on the inner wall surface of the tube. In the cleaning of the inner wall of tube, such as condenser tubes, in power plants, to improve the efficiency of heat transfer therethrough, a resilient scraping tool is inserted into an open end of the tube and a pressurized fluid is charged to the open end of the tube to propel the scraping tool through the tube. During passage through the tube, the scraping tool scrapes deposits from the inner wall of the tube and discharges the deposits from the other end of the tube. Such tube cleaners have been used extensively. A tube cleaner of the type as defined in the preamble of claim 1 is described in EP-A-698 423. The tube cleaner comprises a shaft having a nose portion and a tail portion and having a plurality of spaced scraper devices secured to the shaft. The scraper devices are essentially U-shaped in cross-section and have a base and at least two leg portions. The leg portions have scraping sections which extend outwardly from a terminal end thereof and which are adapted for removing thin, hard deposits from the inner surface of a tube. The leg portions are flat from the base towards the scraping sections. Further examples of typical such tube cleaners are shown, for example, in U.S. 2,170,997; U.S. 2,418,509; U.S. 2,734,208, and U.S. 4,281,432. These tube cleaners use scraping elements that are spaced along a shaft, with scraping blades of adjacent scraping elements offset from each other so that the deposits on the inner tube wall are scraped away along the entire 360° inner circumference thereof. The scraper elements, with the scraper blades, are usually formed from steel and are flexible enough to be inserted into the open end of a tube while making contact with and removing deposits from the tube wall upon passage through the tube. It is an object of the present invention to provide a tube cleaner which is more easily inserted into an open end of a tube to be cleaned. The present invention is to a tube cleaner comprising the features of claim 1. The easy insert tube cleaner of the present invention has a shaft with a nose portion at the front end, a tail portion at the rear end, and a plurality of spaced scraper devices between the nose portion and tail portion. The scraper device is a U-shaped scraper having a base and at least two leg portions, with each leg portion extending in the direction of the tail portion of the tube cleaner. Scraping sections are provided on the terminal ends of the leg portions of the scraper device which extend radially outwardly from the shaft of the tube cleaner. A tongue is provided on the leg portion of the scraper device which extends from the leg portion rearwardly and outwardly to a position adjacent a scraping edge of the scraping section of the scraper device. The tongue is preferably a section partially cut from the leg portion of the scraper device and bent outwardly so as to be outwardly and rearwardly extending. The easy insert tube cleaner of the present invention will be more readily understood by reference to the following description and the accompanying drawings, wherein: Figure 1 is a side elevational view of an embodiment of an easy insert tube cleaner of the present invention; Figure 2 is a front view of the easy insert tube cleaner of Figure 1; Figure 3 is a cross-sectional view through one of the scraper devices used on the easy insert tube cleaner shown in Figure 1; and Figure 4 is a view showing insertion of the easy insert tube cleaner of the present invention into the open end of a tube to be cleaned. The tube cleaner of the present invention is constructed so as to enable easy insertion into an open end of a tube, such as a condenser tube, that is to be cleaned. The tube cleaner is made of a metal such as carbon steel or stainless steel which provides sufficient strength and resiliency to scrape deposits from the inner wall of a tube through which the tube cleaner is passed. Referring now to the drawings, an easy insert tube cleaner 1 is shown that has shaft 2 with a nose portion 3 at the front end and a tail portion 4 at the rear end thereof. The nose portion 3 may have a rivet head which secures scraper devices on the shaft 2, while the tail portion 4 is adapted to provide a surface for impingement of pressurized fluid thereon to drive the tube cleaner through a tube, as known in the art. A plurality of scraper devices 5, shown as four scraper devices, 5a, 5b, 5c and 5d in Figure 1, are spaced along the shaft 2 between the nose portion 3 and tail portion 4. The scraper devices 5 are U-shaped and have a base 6 and at least two leg portions 7 which extend in the direction of the tail portion 4 of the easy insert tube cleaner 1 and have a scraping section 8 at the terminal end 9 of the leg portion 7 which scraping section 8 has a scraping edge 10. The scraper devices 5 are positioned along the shaft of the easy insert tube cleaner 1 in a manner such that the leg portions 7 and scraping edges 10 of adjacent scraper devices 5 are offset from each other. Such positioning is known in the art so as to provide scraping completely around the circumference of a pipe internal surface. In the present easy insert tube cleaner 1, a tongue 11 is provided on the leg portion 7 of the scraper device 5, which tongue extends from the leg portion rearwardly and outwardly to a position adjacent the scraping edge 10 of the scraping section 8 of the scraper device 5. As shown in the drawings, the tongue 11 extends outwardly from the leg portion 7 and has an outer edge 12, which is spaced a distance d from the shaft 2 which is substantially equal to, but less than the distance d 1 which is the distance of the scraping edge 10 or the scraping section 8 from the shaft 2 of the easy insert tube cleaner 1. Preferably, the outer edge of the tongue 11 is a distance d which is about 0,254mm (0.010 inch) less than the distance d 1 . The tongue 11 is readily formed by stamping the same out of the metal substrate that forms the leg portion 7 of the scraper device 5. The provision of the tongue 11 on the leg portion 7 of the scraper device 5, causes the leg portions 7 to bend inwardly upon insertion into a tube 12, as indicated by the arrows in Figure 4, and thus forces the leg portions 7 to move together and provides for a less severe contact with the scraping section 8 of the tube cleaner 1 with the end wall of the tube. By thus moving the leg portions 7 together, easier insertion of the tube cleaner 1 into an open end of a tube is effected.

Claims: A tube cleaner (1) comprising a shaft (2) having a nose portion (3) at a front end and a tail portion (4) at a rear end thereof; and a plurality of spaced scraper devices (5) secured to the shaft (2) intermediate the nose portion (3) and tail portion (4), said scraper devices (5) comprising a U-shaped scraper having a base (6) and at least two leg portions (7), said leg portions (7) extending in the direction of said tail portion (4) and having scraping sections (8) extending outwardly from a terminal end thereof; characterized in that a tongue (11) is provided on said leg portion (7) extending from said leg portion (7) rearwardly and outwardly to a position adjacent said scraping section (8). The tube cleaner as defined in Claim 1 wherein the scraping section (8) of said scraper device (5) has a scraping edge (10) and said tongue (11) has an outer edge (12), with said outer edge (12) spaced a distance (d) from said shaft (2) which is substantially equal to but less than the distance (d 1 ) of said scraping edge (10) from said shaft (2). The tube cleaner as defined in Claim 1 or 2 wherein said scraper device (5) is formed from steel and said tongue (11) is punched out of said leg portion (7). The tube cleaner as defined in anyone of Claims 1 to 3 wherein said scraper device (5) is formed of carbon steel. The tube cleaner as defined in anyone of Claims 1 to 3 wherein said scraper device (5) is formed of stainless steel. The tube cleaner as defined in anyone of Claims 2 to 5 wherein the outer edge. of said tongue (11) is spaced about 0,254 mm (0.010 inch) from the scraping edge (10) of said scraping section (8). The tube cleaner as defined in anyone of Claims 1 to 6 wherein said tongue (11) is formed by punching the same from the leg portion (7).

Inventors: KRYSICKI JERZY, SAXON GREGORY J, KRYSICKI, JERZY, SAXON, GREGORY J.
Applicants: CONCO SYSTEMS INC, CONCO SYSTEMS, INC.
Application year: 1998
Main classification: B08B9
IPC codes: F28G1, B08B9