Патент USA US2136127код для вставки
Nov. 8, 1938. 2,ì36,127 H. W. FAwcl-:TT CENTRIFUGAL SEPARATOR Filed Oct. 8, 1937 Il WlWl M 44, f y? 6 //// f / 4./ 2,136,127 Patented Nov. 8, 1938 PATENT OFFICE _ uNlTED STATES 2,136,127 CENTRIFUGAL SEPARATOR Harold William Fawcett, Harrogate, England Application October 8, 1937, Serial No. 168,057 » In Great Britain October 13, 1936 (Cl. 233-22) 2 Claims. 'I'his invention relates to centrifugal separators of the kind having a bowl provided with periph eral discharge apertures the opening and closing of which is controlled by an hydraulically actu 5 ated sleeve, ring, cylinder or the like surround ing the bowl and movable axially thereto. ‘ Cen trifugal separators of this kind have been de scribed for example in the speciñcation of my United States Patent No 2,023,762. 10 l In the practical operation of centrifugal sepa rators of the foregoing kind, it has been found that the sleeve or the like tends to crossbind and stick as it moves along the bowl axis. One object of the present invention is to pre vent such cross-binding and sticking of the sleeve, ring, cylinder or the like surroundingy and mova ble axially of the bowl. Another object of the invention is to provide a centrifugal separator in which the sleeve, ring, 20 cylinder or the like surrounding the bowl or a member interposed between said sleeve or the like and the bowl is caused to execute a rotary movement on movement of the sleeve or the like axially of the bowl, for the purpose of prevent Still a further object ofthe invention is to provide a centrifugal separator in which the bowl and the surrounding sleeve, ring, cylinder or the 1 Further objects and advantages of the inven tion will become apparent from the following de scription taken in conjunction with the accom panying drawing, in which: Fig. 1 is a vertical section through one embodi 35 ment; Fig. 2 is a detail of Fig. 1 in vertical section on an enlarged scale; Fig. 3 is a plan of Fig. 2; and Fig. 4 shows a detail of a modiiied embodiment. In said drawing like parts are denoted by like 40 characters of reference. In the embodiment shown in Fig. 1, the refer ence numeral I denotes the bowl of the centrifu gal separator which is provided with a plurality 4 of peripheral discharge apertures 2 formed in members 3 screwed into the bowl. Said bowl`| is mounted on a spindle 4 for rotation. is supplied to the cylinder space I5 alternately . above and below the piston II through inlets I3 5 and I4 respectively Draining apertures I6 and I1 are also provided for draining liquid from the cylinder spaces above and below the piston II respectively on completion of the stroke of the 10 cylinder in either direction. In accordance with the present invention pro vision is made for preventing cross-binding of the sleeve 5 and the cylinder parts. This can be eiîected by providing the outer side of the bowl I >and the inner side of the sleeve 5 15 with interengaging screw threads 20, of coarse pitch preferably about 45°. By this means any tendency of one side of the sleeve 5 to move inde pendently of the opposite side is prevented. The bowl I and the cylinder member 1 are 20 also provided with interengaging screw threads 22, 23. This form of construction has the ad vantage that the screw threads 22, 23 are shield ed from discharging sludge and operate in a clean liquid such as water or oil. 25 ing cross binding of said sleeve or the like. like interengage. I5 which is movable axially of the bowl I and relatively to a stationary annular piston II se cured by a lock ring I2 to the bowl I. Liquid Sur rounding said bowl I is a sleeve member 5` having apertures 6 arranged so as to register with the 50 discharge apertures 2 on movement of the sleeve 5 axially of the bowl I. Said sleeve 5 is provided interiorly with an annular extension 1 which to gether with the part 8 of the outer wall of the bowl I and a ring 9 secured to the sleeve 5 by a y55 lock ring I0 defines an annular cylinder space 25 In the foregoing embodiment the sleeve 5 exe cutes a twisting movement relatively to the bowl I. In order to obviate such a twisting movement, the sleeve 5 can be guided by any suitable means 30 to execute a purely axial movement, having no rotary component. To this end, as shown in Fig. 4, a ring 30 is interposed between the piston II and the part Ia of the bowl I. Said ring 30 is provided on its outer side with oblique teeth 3I which engage in corresponding teeth 32 formed in a replaceable ring 33 secured to the bottom projection 1 of the sleeve 5 by screws 34. The inner side of the ring 30 is not provided with teeth but is smooth so that said ring is free to rotate in a plane perpen dicular to the bowl axis. This embodiment operates as followsz--On axial movement of the part 'I relatively to the bowl I, the oblique teeth 32 thereon, engage the corresponding teeth 3I on the ring 3B, where by said ring is rotated. Since the rotation of the ring is the same throughout its circumference and it engages throughout its circumference with the member 33, any tendency for one side of said member 'I to move axially in advance of the opposite side and thus of the sleeve 5 to cross 35 40 45 50 bind, is effectively prevented. 1. A centrifugal separator comprising a bowl 65 2 2,136,127l having peripheral discharge apertures, an annu lar member closely surrounding said bowl and reciprocable axially thereof, said annular mem ber having apertures registering with said periph eral discharge apertures and serving to open and close said latter on reciprocation of said annular member, and interengaging screw threads of 10 lar member closely surrounding said bowl and reciprocable axially thereof, said annular mem ber having apertures registering with said periph eral discharge apertures and serving to open and close said latter on reciprocation of said annular 5 member, an annular shoulder on said bowl, a ring seated on said shoulder, and interengaging screw coarse pitch on the outside of said bowl and on threads of coarse pitch on the outside of said the inside of said annular member. ring and on the inside of the said annular 2. A centrifugal separator comprising a bowl having peripheral discharge apertures, an annu member. 10 HAROLD WILLIAM FAWCETT.