NZ621977B2 - A centrifugal separator - Google Patents
A centrifugal separator Download PDFInfo
- Publication number
- NZ621977B2 NZ621977B2 NZ621977A NZ62197712A NZ621977B2 NZ 621977 B2 NZ621977 B2 NZ 621977B2 NZ 621977 A NZ621977 A NZ 621977A NZ 62197712 A NZ62197712 A NZ 62197712A NZ 621977 B2 NZ621977 B2 NZ 621977B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- channel
- frame
- rotary
- outlet
- inlet channel
- Prior art date
Links
- 238000000926 separation method Methods 0.000 claims abstract description 52
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 36
- 238000005086 pumping Methods 0.000 claims description 24
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 description 10
- 235000003197 Byrsonima crassifolia Nutrition 0.000 description 2
- 240000001546 Byrsonima crassifolia Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 240000008529 Triticum aestivum Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 235000021307 wheat Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
- B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/02—Continuous feeding or discharging; Control arrangements therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B7/00—Elements of centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
- B04B9/02—Electric motor drives
- B04B9/04—Direct drive
Abstract
centrifugal separator includes a frame (1) and a rotating part (2) having a spindle (6) and a centrifuge rotor (7) enclosing a separation space (8). An inlet channel (20) provides fluid communication into the separation space and includes a rotary channel part (21), a frame channel part (22), and a fluid seal (23) at the interface between the rotary and frame channel parts. An outlet channel (30) provides fluid communication out from the separation space and includes a rotary channel part (31), a frame channel part (32), and a seal (33) at the interface between the rotary and frame channel parts. The inlet and outlet channels are arranged concentrically with each other. A pump is provided to generate a leak flow across the appropriate seal interface in the direction from the outlet channel to the inlet channel to counteract leakage across the seal interface in the opposite direction. The pump may be incorporated into the structure of the seal or provided separately to pressurize the flow in the outlet channel so that fluid does not flow across the seal from the inlet channel into the outlet channel. a fluid seal (23) at the interface between the rotary and frame channel parts. An outlet channel (30) provides fluid communication out from the separation space and includes a rotary channel part (31), a frame channel part (32), and a seal (33) at the interface between the rotary and frame channel parts. The inlet and outlet channels are arranged concentrically with each other. A pump is provided to generate a leak flow across the appropriate seal interface in the direction from the outlet channel to the inlet channel to counteract leakage across the seal interface in the opposite direction. The pump may be incorporated into the structure of the seal or provided separately to pressurize the flow in the outlet channel so that fluid does not flow across the seal from the inlet channel into the outlet channel.
Description
WO 34495 ‘ 2012/066955
57960 se
A centrifugal separator
TECHNICAL FIELD OF THE lNVENTiON
The present invention refers to a Centrifuge! separator ing to
the preamble of claim 1, see US~4,759,744.
PRJOR ART
The centrifugal separator disclosed in US—4,759,744 comprises a
frame (illustrated as stationary members), and a rotating part
comprising a spindle and a centrifuge rotor enclosing a separation
space. The rotating part is supported by the frame to rotate around
an axis of rotation. A drive member (not shown in the drawing)
rotates the rotating part. An inlet channei es fluid
communication into the separation space and comprises a rotary
channei part attached to the centrifuge rotor, a frame channei part
attached to the frame, and sealing means provided at the interface
between the rotary i part of the iniet channei and the frame
channel part of the inlet channel. An outiet channei provides fluid
communication out from the separation space and comprises a
rotary channei part attached to the centrifuge rotor, a frame channei
part attached to the frame, and g means provided at the
interface between the rotary channei part of the outlet channel and
the frame channel part of the outiet channei. A further outiet
channel provides fluid communication out from the separation
space and comprises a rotary channel part attached to the
centrifuge rotor, a frame channel part attached to the frame, and
sealing means provided at the interface between the rotary i
part of the further outlet channel and the frame channel part of the
further outlet channel.
in centrifugal separators, such as the one disclosed in US«
4,759,744, it is ant that the sealing means ensures that no
leakage can occur. Leakage from the iniet channel into one of the
outlet channels will severely reduce the ency of the centrifugai
separator, and can under certain circumstances destroy one of the
separated products. Consequently, the costs for the g means
and for the nance of the sealing means are significant.
Furthermore, in centrifugal separators, such as the one disclosed in US-
4,759,744 where all bearings and the drive motor are positioned on the
spindle side, there is a difficulty to ensure a proper functioning of the
sealings of the ication channels at the side of the centrifuge rotor
turned away from the spindle. This is due the to pivoting of the e and
the centrifuge rotor during operation of the centrifugal separator. These
sealings require a complex design since they have to provided a proper
sealing of movements in several directions.
discloses another centrifugal separator comprising a
frame and a rotating part comprising a spindle and a centrifuge rotor
enclosing a separation space. The ng part is supported by the frame to
rotate around an axis of rotation. An inlet channel, comprising a rotary
channel part attached to the fuge rotor, provides fluid ication
into the separation space. An outlet channel, comprising a rotary channel
part attached to the centrifuge rotor, provides fluid communication out from
the separation space. A possible further outlet channel provides fluid
communication out from the separation space.
7210 discloses a mechanical seal with two pairs of opposite seal
surfaces. One seal surface in one of the pairs is provided with spiral
pumping grooves for forcing a medium in one determined ion through
the seal between the opposite seal es.
SUMMARY OF THE ION
The object of the t invention is to overcome the problems discussed
above, and to provide a centrifugal separator, that may ensure a high
separation efficiency, low costs for the sealing means and low nance
costs.
In a described embodiment, this object is achieved by the centrifugal
separator initially defined, which is characterized in
that the inlet channel and the outlet channel are arranged adjacent to and
concentrically with each other, and
that forcing means are ed to generate a leak flow through one of the
sealing means in a first ion from the outlet channel to the inlet channel
and thus to counteract, or prevent, leakage in the opposite ion from
the inlet channel to the outlet channel.
With such an arrangement of the inlet and outlet channels and the forcing
means, it is possible to counteract or prevent e of the product fed to
the separation space into the separated t leaving the separation
space. A low degree of impurities in the separated product is thus achieved.
45 Furthermore, the arrangement of the inlet and outlet channels adjacent to
each other makes it possible to let all communication channels enter the
separation space from one side, for instance through the spindle, thereby
leaving the other side free with only one or completely from communication
channels into or out from the centrifuge rotor and the separation space.
50 Such an arrangement enables a very compact design of the centrifugal
separator, where at least most of the sealing means and bearings may be
provided on one side of the centrifuge rotor, which simplifies the design and
construction of the centrifugal separator.
In the described embodiment, the inlet channel can be configured to feed
a product to be separated into the separation space and the outlet
channel can be configured to discharge a separated primary phase of the
product from the separation space, wherein the forcing means can be
provided to generate said leak flow from the outlet channel to the inlet
channel and thus to counteract, or prevent, leakage from the inlet
channel to the outlet channel, i.e. into the primary phase of the
separated product.
In an embodiment of the invention, the object is achieved by the
centrifugal separator comprising a frame, a rotating part comprising a
spindle and a centrifuge rotor enclosing a separation space, the rotating
part being supported by the frame to rotate around an axis of rotation, a
drive member configured to rotate the rotating part, an inlet channel
ured to provide fluid communication into the separation space and
comprising a first rotary channel part attached to the centrifuge rotor, a
first frame channel part ed to the frame, and a first sealing means
provided at the interface between the first rotary channel part of the inlet
channel and the first frame l part of the inlet channel, and at least
one outlet channel configured to e fluid communication out from
the separation space and comprising a second rotary channel part
attached to the centrifuge rotor, a second frame channel part attached to
the frame, and a second sealing means provided at the interface
between the second rotary channel part of the outlet channel and the
second frame channel part of the outlet l, n the inlet
channel is configured to feed a t to be separated into the
separation space and the outlet channel is configured to discharge a
ted primary phase of the product from the separation space, and
n the inlet channel and the outlet channel are arranged adjacent to
and concentrically with each other, characterized in that forcing means
are provided to generate a leak flow through one of the first and second
sealing means in a first ion from the outlet channel to the inlet
channel and thus to ract, or prevent, leakage in the te
direction from the inlet channel to the outlet channel.
40 According to a further embodiment of the invention, the forcing means
are comprised by said one of the sealing means. Advantageously, at
least said one of the sealing means may then comprise a rotary seal
surface on the respective rotary channel part and a frame seal surface
on the respective frame channel part, and wherein the rotary seal
45 surface and the frame seal surface are arranged te to each other.
A small gap may be provided between the rotary seal e and the
opposite frame seal surface. Advantageously, the rotary seal surface and
the frame seal
surface both extend in parallel with a radial plane with respect to
the axis of rotation.
According to a further embodiment of the ion, the forcing
means comprises a plurality of at least partly non-radial g
elements on at least one of the rotary seal surface and the frame
seal surface. The pumping elements may comprises blades
projecting from at least one of the rotary seal surface and the frame
seal surface, or grooves in at least one of the rotary seal surface
and the frame seal surface. Advantageously, the pumping elements
may have a curved shape seen in the ion of the axis of
rotation.
According to a further embodiment of the invention, the g
means may be configured to generate an overpressure in the outlet
channel with respect to the inlet channel, at least in an area around
said one of the sealing means. Normally, centrifugal separators, in
particularly with a closed separation space, i.e. of a so called
hermetic type, are operated with an overpressure in the inlet
l with respect to the outlet channel.
According to a further embodiment of the ion, the forcing
means may comprise a pump wheel ed to operate on the
outlet channel and arranged to force the fluid communication
through the outlet channel, and thus to generate said leak flow. The
pump wheel may be located upstream said one of the sealing
means. The pump wheel may be driven by means of a turbine
wheel ed in the inlet channel. The pump wheel provides an
example of advantageous forcing means for providing such an
overpressure in the outlet channel.
According to a further embodiment of the invention, the spindle
comprises the rotary channel part of the inlet channel and the rotary
channel part of the outlet channel. Consequently, both the inlet
channel and the outlet l extend h the spindle, enabling
a compact design of the centrifugal separator as mentioned above.
According to a further embodiment of the invention, the drive
member comprises an electrical motor having a rotor and a stator,
wherein the rotor is fixedly connected to the rotating part.
Advantageousiy, the rotor of the ical motor may be provided
on or fixed to the spindle.
According to a further embodiment of the invention, the outlet
channel is provided within the inlet channel. This is advantageous
with respect to the energy consumption since the outlet flow may be
provided at a smaller radius than the inlet flow.
According to a further ment of the invention, the inlet
channel is provided within the outlet channel.
According to a r embodiment of the invention, the centrifugal
separator comprises a further outlet channel configured to provide
fluid communication out from the separation space and comprising
a rotary channel part attached to the centrifuge rotor, a frame
channel part attached to the frame, and sealing means provided at
the ace between the rotary channel part and the frame channel
part. Advantageously, the further outlet channel may be configured
to discharge a separated secondary phase of the t from the
separation space, wherein the forcing means are ed to
generate a leak flow through the sealing means of the inlet channel
from the further outlet channel into the inlet l and thus to
counteract, or prevent, leakage from the inlet channel into the
further outlet channel.
According to a further embodiment of the invention, the outlet
channel is provided within the inlet channel, n the inlet
channel is provided within the further outlet channel at least at the
interface between the rotary channel part of the inlet channel and
the frame channel part of the inlet channel, and wherein the forcing
means are provided to generate a leak flow through the sealing
means of the inlet channel from the further outlet channel into the
inlet channel and thus to counteract, or t leakage from the
inlet channel into the further outlet channel. Advantageously, the
rotary channel parts of the inner outlet channel, the intermediate
inlet channel and the outer further outlet channel are all ned
or comprised in the spindle. This embodiment is ally
advantageous due to the ility of complete dispense with any
communication channels through the casing at the side turned away
from the spindle.
BRIEF PTION OF THE DRAWINGS
The t invention wiii now be explained more ciosely by means
of a description of various embodiments and with reference to the
drawings ed hereto.
F-"ig‘l discloses a centrifugai separator according to a first
embodiment of the invention.
Fig 2 ses a longitudinal section of sealing means of the
centrifugal separator in Fig 1.
Fig 3 discloses a View along the iine Iii—iii in Fig 2.
Fig 4 discloses a longitudinal section of a variant of g
means of the centrifugal separator in Fig 1.
Fig 5 discioses a centrifugal separator according to a second
embodiment of the invention.
Fig 6 discloses sealing means of the centrifugal separator in
Fig 5.
Fig 7 discioses a centrifugai separator according to a third
. embodiment of the invention.
Fig 8 ' ses g means of the centrifugai separator in
Fig 7.
Fig 9 discloses a View along the iine IXuIX in Fig 8.
DETAlLED DESCRiPTION OF VARIOUS EMBODiMENTS OF THE
iNVENTiON
Fig 1 discloses a centrifugal separator according to a first
embodiment comprising a frame 1 and a rotating part 2. The
rotating part 2 is rotatably supported by the frame 1 to rotate
around an axis x of rotation by means of suitable bearing means,
for instance in the form of one or more bearings. In the first
embodiment the bearing means ses a first bearing 3a, and a
second bearing 3b. The first and second bearings 3a, 3b may
se rolier bearings or bali bearings. The first bearing 3a may
be elastically mounted to the frame 1 via a first resilient member 43
having suitable eiastic and damping properties. Also the second
bearing 3b may be elasticaiiy d to the frame 1 via a second
resilient member 4b having suitable elastic and damping properties.
The frame 1 may be nary, at least with t to the rotating
part 2. For instance, the frame 1 may be located or mounted on the
ground, possibly via an intermediate ent that may be
provided with damping means or configured to provide a damping
function of vibrations or other movements of the centrifugal
separator. The frame 1 comprises or carries a casing 5.
The rotating part 2 comprises a spindle 6 and: a centrifuge rotor 7
attached to the spindle 6. The centrifuge rotor 7 is enclosed by the
casing 5. The fuge rotor 7 enctoses or defines a separation
space 8. The centrifuge rotor 7 aiso comprises a plurality or a large
number of separation discs 9 provided in separation space 8. in the
embodiments disciosed, the separation discs 9 are conical.
However, as an alternative radial or even axiai separation discs
may be comprised by the centrifuge rotor 7. The fugal
separator of the embodiments disclosed is of a so called hermetic
type with a closed separation space 8.
The centrifugal separator also comprises a drive member 10 for
rotating the rotating part 2. The drive member 10 comprises, in the
embodiments disclosed, an electric motor d‘irectiy attached to the
spindie 6. The eiectric motor comprises a rotor 11, which is
attached to and extends around the spindle 6, and a stator 12,
which is ed to the frame 1:. Aiternatively, the drive member 10
may be provided beside the e 6 and rotate the rotating part 2
via a suitable transmission, such as a belt or a gear transmission.
in the embodiments disclosed, the first bearing 3a and the second
bearing 3b are attached to the spindle 6 and provided on a
respective side of the drive member 10. The first bearing 3a is
ed on the spindle 6 between the drive member 10 and the
centrifuge rotor 7, whereas the second bearing 3b is provided on
the spindle 6 on the other side of the drive member 10 turned away
from the centrifuge rotor 7.
The centrifugal separator comprises an inlet channel 20, an outlet
channel 30 and a further outlet channel 40.
The inlet channel 20 is configured to provide fluid communication
into the separation space 8 and to feed a product to be separated
into the separation space 8. The inlet channel 20 comprises a first
rotary channel part 21 attached to the centrifuge rotor 7, a first
frame channel part 22 attached to the frame 1, and a first sealing
means 23 provided at the interface between the rotary channel part
21 of the inlet channel 20, and the frame l part 22 of the inlet
channel 20.
The outlet channel 30 is configured to provide fluid communication
out from the separation space 8 and to discharge a separated
primary phase of the product from the separation space 8. The
outlet channel 30 comprises a second rotary channel part 31
attached to the centrifuge rotor 7, a second frame channel part 32
attached to the frame 1, and a second g means 33 provided
at the interface between the rotary channel part 31 of the outlet
channel 30, and the frame channel part 32 of the outlet channel 30.
The further outlet l 40 is ured to e fluid
communication out from the separation space 8 and to discharge a
separated secondary phase of the product from the tion
space 8. The further outlet l 40 comprises a third rotary
channel part 41 attached to the centrifuge rotor 7, a third frame
channel part 42 attached to the frame 1, and a third sealing means
43 provided at the interface between the rotary channel part 41 of
the further outlet channel 40, and the frame channel part 42 of the
r outlet channel 40.
In addition, the centrifugal separator may comprises a ity of
outlet openings, not disclosed in the figures, provided at the outer
periphery of the centrifuge rotor 7 for discharge of a sludge or
another r product from the separation space 8. The openings
may be ently open or intermittently openable by means of
a valve mechanism as known in the prior art.
Furthermore, each of the separation discs 9 may be provided with
one or more feed holes 9a through which the product entering the
separation space 8 may be fed into the package of separation discs
9 and buted onto the separation discs 9.
in the embodiment disclosed in Fig i, the primary phase of the
product is a relatively light phase whereas the secondary phase of
the product is a relatively heavy phase. Furthermore, the primary
phase is the minor phase whereas the secondary phase is the main
phase. These conditions may of course be the opposite in s
variants of the first embodiment disclosed.
The inlet channel 20 and the outlet channel 30 are arranged
adjacent to and concentrically with each other. in the first
embodiment, the outlet l 30 is provided within the inlet
channel 20. it is of course possible, as an ative solution, to
provide the inlet channel 20 within the outlet channel 30.
The centrifugal separator also comprises forcing means ed to
generate a leak flow through one of the sealing means, in the first
embodiment the sealing means 33 of. the outlet channel 30, in a first
direction from the outlet l 30 to the inlet channel 20, and
thus to counteract or prevent e in the opposite direction from
the inlet channel 20 to the outlet channel 30.
The sealing means 23, 33 and 43 comprise a respective rotary seal
t 25, 35 and 45 attached to the respective rotary channel
part 21, 31 and 41, and provided with a respective rotary seal
surface 26, 36 and 46, see also Figs 2 - 4. The sealing means 23,
33 and 43 aiso comprise and a respective frame seal element 27,
37 and 47 attached to the respective frame channel part 22, 32 and
42 and provided with a respective frame seal surface 28, 38 and 48.
The rotary seal surfaces 26, 36 and 46 are arranged opposite to the
respective frame sea! surface 28, 38 and 48. The rotary seal
surfaces 26, 36 and 46 and the frame seal surfaces 28, 38, 48 are
all plane and extend in parallel with a radial plane p with respect to
the axis x of rotation. The rotary seal es 26, 36 and 46 may
be arranged to abut the respective frame seal e 28, 38 and 48
for the rotary seal surface 26, as indicated in Figs 2 and 4, and
frame seal surface 28, and for the rotary seal surface 36 and frame
seal surface 36, as indicated in Fig 2. These abutting seal surfaces
form a so called mechanical seal.
However, it is also possible to arrange the rotary seal surfaces 26,
36 and 46 at a small distance to the respective frame seal surface
28, 38 and 48, leaving a gap, or a thin gap, therebetween as
ted in Fig 2 for the rotary seal surface 36 and the frame seal
surface 38. Such a gap will permit the leak flow mentioned above.
In the first ment, the forcing means comprises a plurality of
at least partly non-radial pumping elements 60 on at least one of
the rotary seal surface 26, 36 and 46 and the frame seal surface 28,
38 and 48. In the embodiment disclosed in Figs 1 – 4, the pumping
elements 60 are provided on the rotary seal surface 36 of the rotary
channel part 31 of the outlet channel 30. It is to be understood, that
the pumping elements 60 alternatively may be provided on the
frame seal e 28, 38, 48, or possibly on both the rotary seal
surface 26, 36, 46 and the frame seal surface 28, 38, 48.
In Figs 2 and 3, the pumping elements 60 are configured as blades
projecting from the rotary seal e 36. In Fig 2 the pumping
elements 60 are ured in such a way that the blades do not
abut the opposite frame seal e 38. However, it is to be
understood that it is possible to let the pumping elements 60 extend
so that the blades will abut the opposite frame seal surface 38.
As can be seen in Fig 3, the pumping elements 60 extend in a nonradial
direction. More precisely, the pumping elements 60 extend
outwardly and rearwardly with respect to the rotary direction r of the
rotary seal surface 60 seen in the ion of the axis x of rotation.
As also illustrated in Fig 3, the pumping elements 60 have a curved
shape seen in the direction of the axis x of rotation. It is to be noted
that the pumping elements 60 instead may have a ht non-
radial extension seen in the direction of the axis x of on.
In the first embodiment, eight such pumping elements 60 are
provided. It is to be noted that the number of pumping elements 60
may be less or more than eight, for instance 2-7 or 9 or more.
In Fig 4, the pumping elements 60 are, instead of comprising
biades, configured as or comprising grooves formed in the rotary
seat surface 36. in this variant of the pumping elements 60, the
grooves may advantageously extend beyond the inner and outer
side surfaces of the rotary seai element 35. rmore, the rotary
seal surface 36 may, but does not have to, abut the frame seal
surface 38 as illustrated in EP-B-37210.
Fig 5 ses a second embodiment of the centrifugai separator,
which s from the first embodiment in that the forcing means
comprises a pump wheel 70 provided in or at the outlet channel 30.
The pump wheel 70 is and arranged to promote the fluid
communication from the separation space 8, and thus to force the
fluid, i.e. the separated primary phase, through the outlet i
, In such a way the leak fiow through the sealing means 33 of the
outlet channei 3O wili be generated. The pump wheel 70 is iocated
upstream the g means 33 of the outlet channel 30.
in the second embodiment, the pump wheel 70 is driven by a
turbine whee! 71 via a drive shaft 72. The turbine wheat 71 is
provided in the iniet channel 20 and driven by the fiuid flow of the
product fed: h the inlet channel 20 into the separation space.
However, as an alternative to the turbine wheel 71, the pump wheel
70 may be driven by an eiectrical motor via the drive shaft '72, or via
a magnetic coupling, y the eiectrical motor may be provided
inside or outside the rotating part 2.
in the second embodiment it may be dispensed with the g
eiements 60. The pumping effect of the pump wheel 70 may be
sufficient to force a email part, i.e. the leak flow, of the primary
phase through the seating means 33. However, it is to be noted that
the pump wheel 70 may be combined with g elements 60.
in the second embodiment, the rotary seal surface 36 and frame
seal surface 38 of. the outiet channel 30 are provided at a small
distance from each other, i.e. with a gap therebetween, in order to
permit the above mentioned leak flow therethrough.
2012/066955
Figs 7 to 9 disclose a third embodiment of the centrifugal separator,
which differs from the one in the first embodiment in that the inlet
channel 20 is provided within the further outlet channel 40 along the
rotary channel part 21 of the inlet channel 20 and along a
substantial part of. the frame channel part 21 of the inlet channel 20.
The outlet channel 30 is provided within the inlet channel 20 as in
the first and second embodiments.
The forcing means are provided to te a leak flow through the
sealing means 23 of the inlet channel 20 from the further outlet
channel 40 into the inlet channel 20, thereby preventing leakage
from the inlet channel 20 into the further outlet channel 40, and to
generate a leak flow through the seating means 33 of the outlet
channel 30 into the inlet channel 20, thereby preventing leakage in
1:5 the from the inlet channel 20 to the outlet channel 30.
In the third embodiment, the forcing means comprises pumping
elements 60 in the form of blades provided on the rotary seal
surface 26 of the inlet channel 26 and the rotary seal e 36 of
the outlet channel 30. The blades on the rotary seal surface 26
and/or the rotary seal surface 36 may of course be replaced by
grooves as sed in Fig 4. The blades and/or grooves have the
same configuration as the blades disclosed in Figs 2 to 4. Also in
this case it is possibly to provide the pumping elements 60 on the
frame seal surface 28 and/or the frame seal surface 38.
A fourth embodiment of the centrifugal separator s from the
one of the third embodiment in that the pumping elements 60 of the
inlet channel 20 on the rotary seal surfaces 26 and/or the pumping
3O elements 60 of the outlet channel 30 on the rotary seal surface 36
have been ed by a pump wheel 70 of the second embodiment
disclosed in Fig 5. The seal surfaces 26, 28 and/or 36, 38 are
arranged at a distance from each to permit the leak flow
therethrough.
The present ion is not d to the embodiments disclosed
and described above, but may be varied and modified within the
scope of the following claims.
Claims (15)
1.
A centrifugal separator comprising - a frame, 5 - a rotating part comprising a sp indle and a centrifuge rotor ing a separation space, the rotating part being supported by the frame to rotate around an axis of rotation, - a drive member configured to rotate the rotating part, - an inlet channel configured to provide fluid communication 10 into the separation space and comprising a first rotary channel part attached to the centrifuge rotor, a first frame channel part attached to the frame, and a first sealing means provided at the interface between the first rotary channel part of the inlet channel and the first frame channel part of the inlet channel, and 15 - at least one outlet channel c onfigured to provide fluid communication out from the separation space and comprising a second rotary channel part ed to the centrifuge rotor, a second frame channel part attached to the frame, and a second sealing means provided at the interface between the second rotary 20 channel part of the outlet l and the second frame channel part of the outlet channel, wherein the inlet channel is configured to feed a product to be separated into the separation space and the outlet l is configured to discharge a separated primary phase of the product 25 from the separation space, and n the inlet channel and the outlet channel are arranged adjacent to and concentrically with each other, characterized in - that forcing means are prov ided to generate a leak flow 30 through one of the first and second sealing means in a first direction from the outlet channel to the inlet channel and thus to counteract, or prevent, leakage in the opposite direction from the inlet channel to the outlet channel. 35 2. A fugal separator according to claim 1, wherein at least said one of the first and second sealing means comprises a rotary seal surface on the respective rotary l part and a frame seal e on the tive frame channel part, and wherein the rotary seal surface and the frame seal surface are arranged opposite to each other.
3. A centrifugal separator according to claim 2, wherein the 5 rotary seal surface and the frame seal surface both extend in parallel with a radial plane with respect to the axis of rotation.
4. A centrifugal separator according to any one of claims 2 and 3, n the forcing means comprises a plurality of at least partly 10 non-radial pumping elements on at least one of the rotary seal surface and the frame seal surface.
5. A centrifugal tor according to claim 4, wherein the pumping elements have a curved shape seen in the direction of the 15 axis of rotation.
6. A centrifugal separator according to any one of the ing claims, wherein the forcing means comprises a pump wheel provided to e on the outlet channel and arranged to force the 20 fluid communication through the outlet channel, and thus to te said leak flow.
7. A fugal separator according to claim 6, wherein the pump wheel is located upstream said one of sealing means.
8. A centrifugal separator according to any one of the preceding claims, wherein the e comprises the first rotary channel part of the inlet channel and the second rotary channel part of the outlet channel.
9. A centrifugal separator according to any one of the preceding claims, wherein the drive member comprises an electrical motor having a rotor and a stator, and wherein the rotor is fixedly connected to the rotating part.
10. A centrifugal tor according to any one of the ing claims, wherein the outlet channel is provided within the inlet channel.
11. A centrifugal separator according to any one of claims 1 to 9, wherein the inlet channel is provided within the outlet channel.
12. A centrifugal tor according to any one of the preceding 5 claims, wherein the centrifugal separator comprises a further outlet channel ured to provide fluid communication out from the separation space and comprising a third rotary channel part attached to the centrifuge rotor, a third frame l part attached to the frame, and a third sealing means provided at the interface 10 between the third rotary channel part and the third frame channel part.
13. A centrifugal separator according to claim 12, wherein the r outlet channel is configured to discharge a separated 15 secondary phase of the product from the separation space, and wherein the forcing means are provided to generate a leak flow h the first sealing means of the inlet channel from the further outlet channel into the inlet channel and thus to counteract, or prevent, leakage from the inlet channel into the further outlet 20 channel.
14. A centrifugal separator according to any one of claims 12 and 13, wherein the outlet channel is provided within the inlet l, wherein the inlet channel is provided within the further outlet 25 channel at least at the ace between the first rotary channel part of the inlet channel and the first frame channel part of the inlet channel, and wherein the forcing means are provided to generate a leak flow through the first sealing means of the inlet channel from the further outlet channel into the inlet channel and thus to 30 counteract, or prevent, leakage from the inlet channel into the further outlet channel.
15. A fugal separator substantially as herein described or exemplified, with reference to the accompanying drawings. WO 34495 1 /5
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11180499.3 | 2011-09-08 | ||
EP11180499.3A EP2567754B1 (en) | 2011-09-08 | 2011-09-08 | A centrifugal separator |
PCT/EP2012/066955 WO2013034495A2 (en) | 2011-09-08 | 2012-08-31 | A centrifugal separator |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ621977A NZ621977A (en) | 2016-02-26 |
NZ621977B2 true NZ621977B2 (en) | 2016-05-27 |
Family
ID=
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