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Патент USA US2136127

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Nov. 8, 1938.
2,ì36,127
H. W. FAwcl-:TT
CENTRIFUGAL SEPARATOR
Filed Oct. 8, 1937
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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.
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