Technical Field of the Invention
-
The present invention relates to a static fluid mixer not
having any mechanical moving parts.
Background arts
-
Conventionally, a fluid mixer disclosed by Japanese
Patent Laid-Open Patent Publication No. 133822-1983 was
publicly known as a type of a static fluid mixer. Such a static
fluid mixer consists of a cylindrical casing provided with an
inlet and an outlet at either end thereof, and a plurality of
fluid mixing elements composed so that two large and small disks,
in which a number of polygonal small chambers, respectively,
having a forward open side at the faces opposed each other, are
arrayed like a honeycomb so as to be concentric to each other,
wherein the large disk has a diameter coincident with the inner
diameter of the casing and has a circulating port prepared at
the center thereof, and the large disk and small disk are arrayed
so that the positions thereof are changed so that the respective
small chambers thereof can communicate with the other plurality
of small chambers opposed thereto. And, a plurality of these
fluid mixing elements are caused to overlap so that the disks
of the same diameter are adjacent to each other, and are disposed
in the casing, and at the same time, the large disks of the fluid
mixing elements are positioned at both sides thereof, wherein
the communicating ports are also caused to communicate with the
inlet and outlet of the casing.
-
And, where a fluid to be mixed is caused to flow from the
inlet into the interior space under pressure, the fluid reaches
the interior through the circulating ports of the fluid mixing
elements at the upstream side, changes the flow direction since
the straight flow course is hindered by small disks
communicating with each other, and unevenly and radially flows
from the middle port toward the outside through small chambers
communicating with each other. Then, the fluid which reaches
the inner circumferential surface of the casing, passing
through the upstream side fluid mixing elements, enters
respective small chambers of the downstream side fluid mixing
elements from flow paths formed by the inner circumferential
surface of the casing and the small disks, further flows in the
middle portion, and again enters the downstream side fluid
mixing elements from the flow paths. Here, the fluid unevenly
circulates in the interior of the fluid mixing elements one
after another from the middle portion toward the outside,
passing through the respective small chambers, and finally is
discharged from the outlet.
-
However, since a disk of a large diameter is provided with
a sealing function so that the outer diameter thereof is made
close to the inner diameter of the casing, it is necessary to
precisely machine the inner diameter of the casing and the outer
diameter of the disk of a large diameter, and the casing requires
some length to array a plurality of fluid mixing elements.
Therefore, it becomes difficult to precisely machine the inner
diameter of the entire length of the casing. Further, since the
outer diameter of the disk of the large diameter is in only close
contact with the inner diameter of the casing, the inner
diameter may be enlarged since the casing is strained as the
supply pressure of a fluid is increased, whereby slight
clearance is produced partially between the outer diameter of
the disk of the large diameter and the inner diameter of the
casing, and the fluid may flow out to the outlet side by
short-circuiting through such clearance without being
subjected to any mixing action along the entire length of the
inner circumferential surface. Such a problem arises, in which
the regular mixing efficiency is reduced.
-
It is therefore an object of the invention to provide a
static fluid mixer which is constructed so that it is simple
to assemble the mixer, machining of the inner circumferential
surface of the casing is facilitated by roughing the machining
accuracy to reduce production costs, vibration of mixing
elements is prevented from occurring, and a mixing
insufficiency due to short-circuiting flows generated by
leakage of the fluid can be improved.
Disclosure of the invention
-
In view of the difficulty of accurate machining on the
basis of the prior arts and a theme of improving upon the lowering
of efficiency due to short-circuit flows, the invention
provides a static fluid mixer in which mixing assembly elements
internally secured in the casing are composed of an annular
sealing unit formed of a resilient material and mixing elements,
and which has objects of eliminating a short-circuiting flow
and of facilitating the machining thereof, whereby the
abovementioned shortcomings and problems can be solved.
-
The static fluid mixer is composed of a casing, a cover
member, and mixing assembly elements, the casing is formed
cylindrical, and a covering member is detachably attached to
the inlet and outlet secured at both sides.
-
The mixing assembly elements are composed of an annular
sealing unit and mixing elements internally secured in the
annular sealing unit, wherein the annular sealing unit forms
a cylindrical body made of a resilient material, with the outer
diameter thereof idly inserted in the casing, and has a flange
integrally formed inwardly at both sides.
-
The mixing elements are composed of a pair of two large
and small disks which have a number of small chambers, whose
ends are opened forward, arranged on their front surfaces
opposed each other, and the pair of two large and small disks
are caused to overlap concentrically, wherein the large
diameter disk is formed with a larger outer diameter rather than
the inner circumference diameter of the flange at the annular
sealing unit, and at the same time, has a fluid circulating pore
prepared at the middle thereof, and the outer diameter side of
the small disk is constructed so that a fluid circulating path
is formed between the outer diameter side thereof and the inner
circumferential surface of the cylindrical body. The small
chambers of the large diameter disk and small chambers of the
small diameter disk are caused to communicate with the other
plurality of small chambers so that the respective small
chambers are opposed to each other, and are arrayed with their
position changed, so that crossing connection portions of side
walls which form other small chambers are positioned at the
center of the small chambers.
-
And, the mixing assembly elements have a large diameter
disk of the mixing elements disposed at both sides in the annular
sealing unit, and two small disks are arrayed therebetween. The
mixing assembly elements are arrayed in a plurality in the
casing, and are placed between the covering members at both
sides of the casing, so that the flanges of the annular sealing
units are resiliently deformed under compression.
-
Further, a packing having a communication portion formed
at the middle thereof is caused to intervene in space inward
of the flange portion of the annular sealing units at the mixing
assembly elements arrayed in a plurality in the casing or
between the space and the flange portion of the annular sealing
unit, in a state where it is resiliently compressed and deformed
when being attached thereat.
Brief description of the drawings
-
- FIG. 1 is a roughly longitudinally sectional view of a
static fluid mixer according to the present invention,
- FIG. 2 is a roughly longitudinally sectional view showing
a state before a covering member is attached in the static fluid
mixer,
- FIG. 3 is a perspective disassembled view of mixing
assembly elements which constitute the static fluid mixer,
- FIG. 4 is a front elevational view of two disks which
constitute mixing elements of the mixing assembly elements,
- FIG. 5 is a perspective view of the same disks,
- FIG. 6 is a view showing an arrayed state of respective
small chambers for communication in a case where the two disks
are arrayed concentrically,
- FIG. 7 is a view showing an arrayed state thereof for
communication where the shapes of the small chambers in the same
disks are made triangular,
- FIG. 8 is a view showing an arrayed state thereof for
communication where the shapes of the small chambers in the same
disks are made square,
- FIG. 9 is a view showing an arrayed state thereof for
communication where the shapes of the small chambers in the same
disks are made octangular,
- FIG. 10 is a roughly longitudinally sectional view of
another preferred embodiment of a static fluid mixer according
to the invention,
- FIG. 11 is a roughly longitudinally sectional view
showing a state before a covering member is attached in the
static fluid mixer,
- FIG. 12 is a perspective view showing mixing assembly
elements and a packing member in the static fluid mixer,
- FIG. 13 is a roughly longitudinally sectional view
showing still another preferred embodiment of a static fluid
mixer,
- FIG. 14 is a roughly longitudinally sectional view
showing a state before a covering member is attached in the
static fluid mixer, and
- FIG. 15 is a perspective view of mixing assembly elements
and a packing member in the same static fluid member.
-
Best mode for carrying out the invention
-
A description is given of preferred embodiments of the
invention with reference to the accompanying drawings.
-
A static fluid mixer 1 according to the invention
internally has an appointed number of mixing assembly elements
in a cylindrical casing 4 having an inlet 2 and an outlet 3.
-
Flange 6 or 6a protruding outward is formed at open
portions at both ends of the casing 4, and covering members 7
or 7a having an inlet 2 and an outlet 3 formed, whose diameter
is smaller than the inner diameter of the casing 4, is
detachably mounted at the end faces of the flanges 6 and 6a.
-
Mixing assembly elements 5 are internally provided in the
axial direction in the hollow internal portion of the casing
4, and such mixing assembly elements 5 are composed of annular
sealing units 8 and mixing elements 9. The annular sealing units
8 are made of elastomer (nitril rubber, silicone rubber,
fluorine rubber, thermoplastic elastomer, etc.) having
rubber-like resiliency, which is a material property as a
resilient body used for general sealing devices, and forms a
cylindrical body 10 with the outer diameter to be idly inserted
into the casing 4 with slight clearance, wherein flanges 11 or
11a are integrally formed from both ends of the cylindrical body
10 to be constituted as a ring-like member.
-
The mixing elements 9 are internally provided in the
annular sealing unit 8, and as shown in FIG. 3 through FIG. 6,
two large and small disks 14 and 15 are provided as a set, in
which a number of small columnar chambers 13, 13a, etc., having
a bottom, whose plan view is polygonal, which are opened forward
and erect roughly at a right angle toward the front side, are
arrayed adjacent to each other are arranged on the front side
of disks opposed each other, and these disks are caused to
overlap concentrically. And, two sets of such mixing elements
9 are internally provided in the annular sealing unit 8.
-
Further, the disk 14 of a large diameter is formed with
a larger diameter rather than the inner circumferential
diameter of the flanges 11 and 11a at the annular sealing unit
8, so that at least the inner face of the flanges 11 and 11a
are provided so as to overlap on the rear side of the disk 14
on the outer circumferential side thereof, and preferably the
outer circumferential end face of the disk 14 is formed at an
outer diameter which can be brought into close contact with the
inner circumferential face of the cylindrical body 10 of the
annular sealing unit 8, whereby such contacted portions are made
substantially fluid-tight (to seal fluids such as air and
liquid), and a circulating pore 16 is prepared at the middle
thereof. On the other hand, the outer diameter of the disk 15
of a small diameter is spaced from the inner circumferential
face of the cylindrical body 10 at the annular sealing unit 8
and is sized so that a circulating path 17 can be formed between
the outer diameter thereof and the corresponding inner
circumferential face.
-
In addition, as shown in FIG. 6, the small chambers 13,
13a, etc., of the disks 14 of a large diameter and the small
chambers 13, 13a, etc. of the disk 15 of a small diameter are
caused to communicate with the other small chambers 13, 13a,
etc., in which the respective small chambers 13, 13a, etc., are
opposed each other, and are positioned with their positions
changed so that the crossing connection portions of the side
walls 12 which form other small chambers 13, 13a, etc., are
located at the center of the small chambers 13, 13a, etc.
-
And, these two sets of mixing elements 9 have a
large-diameter disk 14 disposed at both sides of the annular
sealing unit 8, and further have two small-diameter disks 15
disposed therebetween, wherein two sets of mixing elements 9
and small disks 15 are internally provided in the annular
sealing unit 8, thereby constituting a mixing assembly element
5.
-
Also, the length of the cylindrical body 10 of the annular
sealing unit 8 in the axial direction thereof is made roughly
coincident with the thickness in the axial direction in a state
where four large and small disks 14 and 15 of the mixing elements
9 are caused to overlap each other concentrically.
-
Further, the abovementioned preferred embodiment shows
an example in which small chambers 13, 13a, etc., whose plan
view is hexagonal are arrayed in a plurality like a honeycomb.
However, the shape is not limited to such a form. As shown in
FIG. 7 through FIG. 9, the plan view of the small chambers 13,
13a, etc., may be triangular, square, octangular, or circular
(not illustrated).
-
Next, a plurality of mixing assembly elements 5 are
disposed in series in the internal hollow portion of the casing
4, wherein covering members 7 and 7a are mounted at the flanges
6 and 6a by tightening means such as bolts, nuts, etc., and a
plurality of mixing assembly elements 5 are placed and fixed
between the covering members 7 and 7a and are arrayed in the
casing 4.
-
Herein, by setting the dimension L2 between both ends in
a continuous state, where the mixing assembly elements 8
provided in a plurality are concentrically installed in a free
state in a continuous state where the respective flanges 11 and
11a of the annular sealing unit 8 are brought into contact with
each other, greater than the dimension L1 between both ends of
the casing 4, a pressing force is applied to the respective
flanges 11 and 11a of the annular sealing unit 8 at the respective
mixing assembly elements 5. Therefore, the respective flanges
11 and 11a are resiliently compressed and deformed by the
pressing force, and the respective upper end faces of the side
walls 12 of the small chambers 13, 13a, etc., are pressed by
the resiliency restoring force to cause the contacting state
to be made satisfactory. Further, the flanges 11 and 11a of the
annular sealing unit 8 are pressed to the rear side at the outer
circumferential side of the large diameter disk 14 to cause the
contacting state to be made satisfactory, whereby the sealing
function will be completed.
-
Herein, the dimension of the inner diameter of the flanges
11 and 11a of the annular sealing unit 8 in the abovementioned
preferred embodiment is established in relation to the material
of the annular sealing unit 8 so that the mixing assembly
elements 5 can be easily mounted substantially in a state where
no cut is produced even at a part of the annular sealing unit
8 when the annular sealing unit 8 is resiliently deformed. As
a detailed embodiment, the dimension of the inner diameter of
the flanges 11 and 11a at the annular sealing unit 8 is set to
approximately 90mm where the outer diameter of the large-diameter
disk 14 is approximately 90mm and the thickness in the
axial direction is approximately 25mm when four large- and
small- diameter disks 14 and 15 are caused to concentrically
overlap.
-
Next, in the abovementioned preferred embodiment, since
the sealing portion at the rear side of the large diameter disk
14 is the outer circumferential side with which the flange
portions 11 and 11a of the annular sealing unit 8 are in close
contact, the flanges 11 and 11a at such portions are protruded,
and there is a possibility for the sealing to become
insufficient. Therefore, another preferred embodiment is
provided to solve such insufficient sealing. As shown in FIG.
10 through FIG. 12, a packing member 18 is caused to intervene
in a space inward of the flanges 11 and 11a of the annular sealing
body 8 at the mixing assembly element 5 internally incorporated
in the casing 4, wherein there are two types of packing members
18, one of which is an intermediate packing 19 intervening
between the mixing assembly elements 5, and end packing 20
intervening between the mixing assembly elements 5 and the
covering members 7 and 7a.
-
The intermediate packing 19 is made of a resilient body
similar to that of the annular sealing unit 8. Columnar portions
22 and 22a which have a slightly smaller diameter than the inner
diameter of the flanges 11 and 11a of the annular sealing unit
8 are caused to protrude from and formed at both sides of a disk
body 21 which has a larger diameter than the inner diameter of
the flanges 11 and 11a of the annular sealing unit 8 and a smaller
diameter than the inner diameter of the casing 4, and at the
middle portion thereof, a communication pore 23 which is
constituted so as to have roughly the same diameter as that of
the circulating pore 16 being formed at the large diameter disk
14.
-
The end packing 20 is such that only either one of the
columnar portions 22 and 22a of the intermediate packing 19 is
not produced, and the disk bodies 21 of the end packing 20 may
be caused to overlap each other so as to constitute an
intermediate packing 19.
-
Further, in the abovementioned embodiment, the
intermediate packing 19 and end packing 20 are formed so as to
have a portion which is placed and nipped between the flanges
11 and 11a of the mixing assembly elements 5. However, these
packings may not be limited to this shape. As shown in FIG. 13
through FIG. 15, those in which a communication pore 23 is formed
at the middle of the disk body 21 which has a slightly smaller
diameter than the inner diameter of the flanges 11 and 11a of
the annular sealing unit 8 may be used as the intermediate
packing 19 or the end packing 20.
-
Herein, by setting the dimension L2 larger than the
dimension L1 between both ends of the casing 4 where the annular
sealing unit 8, intermediate packing 19 and end packing 20 are
concentrically constructed in a free state, the flanges 11 and
11a of the annular sealing unit 8, intermediate packing 19 and
end packing 20 are, respectively, established so as to be
resiliently deformable under compression.
-
Also, as still another embodiment of the covering members
7 and 7a, a columnar projecting portion (not illustrated) idly
inserted into the openings at both ends of the casing 4 is formed
at one end side of the plate- like covering members 7 and 7a,
and where such covering members 7 and 7a are mounted, the flange
11 and 11a of the annular sealing unit 8 in the mixing assembly
elements 5 are pressed in the casing 4, wherein the dimension
L2 may be changed in design by the projection dimension of the
columnar projection portion.
-
Further, the positional slip of the two large and small
disks 14 and 15 in the circumferential direction in the mixing
assembly elements 9 is regulated by the projection portion 26
formed where a pin 24 and a pin inserting hole 25 are formed.
-
Next, the structural actions of the static fluid mixer
are to firmly maintain the contacting state of the upper end
faces of the side wall 12 which forms small chambers 13, 13a,
etc., at the disks 14 and 15 since the covering members 7 and
7a are mounted at both ends and the mixing assembly elements
5 are placed and nipped therebetween, and at the same time to
provide a sealing function at the outer circumferential side
since the flanges 11 and 11a of the annular sealing unit 8 are
brought into close contact with the outer circumferential side
of the rear side of the large diameter disk 14 in a resiliently
compressible and deformable state, whereby leakage from the
rear side of the large diameter disk 14 into the annular sealing
unit 8 and leakage from the contacting portion of the flanges
11 and 11a into between the outer circumferential side of the
annular sealing unit 8 and the inner circumferential face of
the casing 4 can be regulated.
-
Further, in an embodiment in which the intermediate
packing 19 and end packing 20 are provided as the packing members
18 consisting of only a disk body 21, the intermediate packing
19 and end packing 20 are, respectively, resiliently
compressibly and deformably placed in space ranging from the
surrounding of the circulating pore 16 at the rear side of the
large diameter disk 14 to the portion sealed by the flanges 11
and 11a of the annular sealing unit 8, wherein the intermediate
packing 19 and end packing 20 are brought into close contact
with the rear side of the large diameter disk 14 at such a portion
to provide a sealing function, whereby leakage from the rear
side of the large diameter disk 14 into the annular sealing unit
18 and leakage from the contacting portion of the flanges 11
and 11a into space between the outer circumferential face of
the annular sealing unit 8 and the inner circumferential face
of the casing 4 can be regulated, and the sealing function can
be further improved.
-
Further, in the embodiment in which the intermediate
packing 19 and end packing 20 are mounted as a packing member
18 which forms the columnar portions 22 and 22a of the disk body
21, there may be a case where a slight space or clearance is
formed between the outer circumferential face of the disk body
21 and the inner circumferential face of the flanges 11 and 11a
of the annular sealing unit 8. Therefore, although there is a
slight possibility for fluid to leak out of such space or
clearance, with the preferred embodiment, a feature to regulate
the leakage through such a space or clearance can be further
improved than in the above case.
-
Next, a description is given of the mixing actions of a
static fluid mixer according to the invention.
-
As a basic mixing action, as a fluid is compressed and
is caused to flow from the inlet 2 of the static fluid mixer
into the internal space of the casing 4, a flow of fluid reaches,
as show in, for example, by the arrows in FIG. 1, the interior
through the circulating pore 16 of the upstream side mixing
assembly elements 9, and flows and circulates in a complicated
state with right angle collisions, dispersions, confluence,
serpentine flows, and vortex flows combined, uniformly radially
from the middle portion to the outside through a plurality of
small chambers communicated with each other.
-
As described above, the fluid reaching the inner
circumferential face of the annular sealing unit 8, passing
through the upstream side mixing assembly elements 9, enters
respective small chambers 13, 13a, etc., of the downstream side
mixing assembly elements 9 formed by the inner circumferential
face of the annular sealing unit 8 and the small diameter disk
15, wherein the fluid is collected at the middle portion through
complicated flows such as right angle collisions, dispersions,
confluence, serpentine flows, vortex flows, etc., as described
above, and circulates in the mixing assembly elements 9 one
after another in a complicated state such as right angle
collisions, dispersions, confluence, serpentine flows, vortex
flows, etc., from the middle portion to the outside, again
passing through other small chambers 13, 13a, etc. Finally, the
fluid is discharged through the outlet 3.
-
Further, a fluid can be uniformly dispersed and mixed by
right angle collisions against the bottoms of the respective
small chambers 13, 13a, etc., and side walls, dispersions from
the respective small chambers 13, 13a, etc., to the other
plurality of small chambers 13, 13a, etc., confluence or
serpentine flows from a plurality of small chambers 13, 13a,
etc. to one of the other small chambers 13, 13a, etc.,
hydrodynamic shearing by vortex flows from a plurality of small
chambers 13, 13a, etc., to the respective small chambers 13,
13a, etc., hydrodynamic shearing, impact breakage when passing
through orifices being communicating paths from the respective
small chambers 13, 13a, etc., to the other small chambers 13,
13a, etc., and shearing, mechanical cavitation, etc., when
passing through the upper end face of the side walls 12, etc.,
Industrial applicability
-
In summary, in the present invention, covering members
7 and 7a having an inlet 2 and an outlet 3 formed at both ends
of a cylindrical casing 4 are detachably formed. A cylindrical
body 10 is formed of a resilient body with an outer diameter
that can be idly inserted into the casing 4. An annular sealing
unit 8 is formed by integrally forming flanges 11 and 11a inward
of both ends of the cylindrical body 10. Two large and small
disks 14 and 15, in which a number of small chambers 13, 13a,
etc., having an open end at the front ends thereof opposed each
other are arrayed, are prepared as a set and are caused to overlap
each other to establish a mixing element 9. The outer diameter
of the large diameter disk 14 is formed at a larger outer diameter
than the inner circumferential diameter of the flanges 11 and
11a of the annular sealing unit 8, and a circulating pore 16
is prepared at the middle. At the same time, the outer diameter
side of the small diameter disk 15 is constructed so as to form
a circulating path 17 between the outer circumferential side
thereof and the inner circumferential side of the cylindrical
body 10. Small chambers 13, 13a, etc., of the large diameter
disk 14 of such a mixing element 9 and small chambers 13, 13a,
etc., of the small diameter disk 15 are caused to communicate
with the other plurality of small chambers 13, 13a, etc., to
which the respective small chambers 13, 13a, etc., are opposite,
and at the same time, are arrayed with the positions thereof
changed so that the crossing connection portions of the side
walls 12 which form the other small chambers at the centers of
the small chambers 13, 13a, etc. The large diameter disk 14 is
disposed at both sides in the abovementioned annular sealing
unit 8, wherein two small diameter disks 15 are arrayed
therebetween to constitute a mixing assembly element 5, and the
mixing assembly elements 5 are arrayed in the casing 4 and are
placed and nipped between the covering members 11 and 11a at
both ends of the casing 4 so that the flanges 11 and 11a of the
annular sealing unit 8 are resiliently deformed under
compression. Therefore, the mixing elements 9 can be internally
placed in the casing 4 in the form of a mixing assembly element
5 internally incorporated in the annular sealing unit 8, and
simultaneously since the large diameter disk 14 is disposed at
both sides of the mixing assembly element 5 when internally
incorporating it in the casing 4, it can be internally mounted
in the casing 4 regardless of the flow direction. Accordingly,
the assembly can be remarkably facilitated.
-
Since it is not necessary to provide a sealing function
between the outer circumferential surface of the annular
sealing unit 8 and the inner circumference of the casing 4, the
machining accuracy of the inner circumferential surface may be
roughened. The machining of a casing 4 in which a number of mixing
assembly elements 5 are provided becomes further easy, whereby
production costs may be reduced. Moreover, since the outer
diameter of the large diameter disk 14 of the mixing element
9 is brought into close contact with the inner face of the flanges
11 and 11a of the annular sealing unit 8, it is possible to
prevent play in the diametrical direction when mixing a fluid.
Further, since the annular sealing unit is made of a resilient
material, the annular sealing unit 8 can function as a shock
absorber against vibrations in cases where the mixing elements
9 vibrate due to pulsation occurring when a fluid passes through
the mixing elements 9 while flowing in a complicated state and
pulsation of a pump itself, whereby the annular sealing unit
8 can absorb or deteriorate vibrations of the mixing elements
9. Therefore, it is possible to prevent adverse influences upon
the surrounding devices and the structural body. Also, since
the covering members 7 and 7a are mounted at both ends of the
casing 4 and the mixing assembly elements 5 are placed and nipped
therebetween, it is possible to firmly maintain the contacting
state of the upper end surface of the side walls 12 which form
the small chambers 13, 13a, etc., at the disks 14 and 15, and
play of the respective disks 14 and 15 can be prevented. Still
further, insufficiency in mixing due to short-circuited flows,
which may occur due to leakage through the upper end face of
the side walls 12 or the outer circumferential side of the large
diameter disk 14 can be further improved.
-
In addition, since a packing member 18 having a
communicating pore 23 formed at the middle thereof is caused
to intervene in space inward of the flanges 11 and 11a of the
annular sealing unit 8 at the mixing assembly element 5 arrayed
in a plurality in the casing 4 in a state where the packing member
18 is resiliently made compressible and deformable when
mounting the covering members 7 and 7a, the packing member 18
is brought into close contact with the rear side of the large
diameter disk 14 at such a portion, and a sealing function is
provided on the entire rear side from the surrounding of the
circulating pore 16 of the large diameter to the inner
circumferential edge of the flanges 11 and 11a of the annular
sealing unit 8, whereby leakage of a fluid from the rear side
of the large diameter disk 14 into the annular sealing unit 8
or leakage from the contacting portion of the flanges 11 and
11a into space between the outer circumferential surface of the
annular sealing body 8 and the inner circumferential surface
of the casing 4 can be further better regulated. That is, the
sealing function can be further improved. Therefore,
insufficiency in mixing due to short-circuited flows resulting
from such leakage can be further improved.
-
Also, since a packing member 18 having a communicating
pore 23 formed at the middle thereof is caused to intervene in
space inward of the flanges 11 and 11a of the annular sealing
unit 8 at the mixing assembly element 5 arrayed in a plurality
in the casing 4 or between the flanges 11 and 11a of the annular
sealing unit 8 in a state where the packing member 18 is
resiliently made compressible and deformable when mounting the
covering members 7 and 7a, slight space or clearance is formed
between the outer circumferential surface of the disk body 21
and the inner circumferential surface of the flanges 11 and 11a
of the annular sealing unit 8 in the case of a packing member
18 consisting of only a disk body 21 as described above, there
is a slight possibility for a fluid to leak from such a portion.
However, according to the invention, the leakage of a fluid from
such a portion can be still further prevented, whereby the
practical application effect becomes remarkable.
