Patent GB-464245-A (GB)
Title: Centrifugal separating machine
IPC: B04B3/00
Filed: 1936-07-08
Abstract: 464,245. Centrifugal machines. PECKER, J. S. July 8, 1936, No. 18965. [Class 23] The bowl of a centrifugal separator has imperforate side walls, and a top with seepage openings communicating with channels for the discharge of liquid ; this discharge is assisted by currents of air passing outwards through the channels and exercising a suction effect as they pass over the seepage openings. The casing consists of sections 1, 3, 2, 4, and the bowl 5 is housed below the section 2 which supports the necessary hollow spindles for the air supply and the scrapers. The annular top plate 7 of the basket has a series of grooves 12 across its lower face at an inclination to the radius to facilitate tangential discharge of the liquid from the flared end 13 of each groove. The channels formed by the grooves 12 are arched transversely and the inner end of each has a reduced opening 16 forming an air inlet. The bottom of these channels is formed by the seepage plate 18 which has groups of slots 21 extending longitudinally beneath the channels. These slots have narrow inlets and are flared to provide wider outlets. Liquid separated from the material in the bowl flows up through the slots 21 and along the channels 12, to be discharged in an outward and downward direction. The rotary movement of the drum-produces a blower action and currents of air assist the centrifugal discharge of the liquid. The scrapers 2 7 for dislodging solids from the bowl wall, are keyed to the hollow shafts 25 supported from the casing section 2 and connected to water supply pipe 47. The scrapers are hollow and their top walls 39 have flared slots 41, so that water can be supplied from the pipe 47 to the scrapers and discharged through the slots 41 for the purpose of cleaning the slots 21 in the seepage plate 18. Each scraper has a vertical blade 33 with cutting teeth 35 at its edge and the teeth on one scraper blade are staggered with respect to those on the other. A scraper knife 48 is secured to the top of each scraper 27 and serves to clean the lower face of the seepage plate. As the bowl rotates the slots 21 will be carried over the knife 48 before they reach the water discharge from the slots 41 of the scraper. When the scrapers are not in use, they are turned to the centre of the bowl where they do not interfere with the separating action. In the modification shown in Figs. 7, 8, the cleansing device for the seepage plate is independent of the scraper and consists of a hollow casing 52 supplied with water, steam or air through the hollow shaft 53. The medium is discharged through the flared slots 64 to clean the slots in the seepage plate 60 after their passage over the scraper knife 70, which is held in engagement with the plate by the spring 72. The knife 70 can be adjusted by means of the screws 82. The cleaning process is assisted by a jet from the nozzle 67 which enters the narrow opening 68 at the end of the channel above the seepage slots. The cleansing device may be moved to different positions by the handle 78, and the knife 70 may be pivotally mounted. Specification 453,561 is referred to.