JP6260054B2 - Defoaming device - Google Patents

Description

  The present invention relates to a defoaming apparatus having a defoaming blade that defoams bubbles flowing in from an inflow port and discharges them from a discharge port.

Patent Document 1 proposes a defoaming device for disappearing or destroying bubbles that exist on a solution in a container and cause instability of transport amount due to mixing in a transport pump.
The defoaming device described in Patent Document 1 has a plate-like body disposed opposite to each other with a space therebetween, and a defoaming blade having a partition plate provided between the plate-like bodies. The plate-like body and the partition plate form a bubble channel toward the radially outer side (centrifugal direction) of the rotating shaft, and the channel gradually becomes narrower in the centrifugal direction and downward. Yes.

  The defoaming principle of such a defoaming blade is the following three points. The first point is compression bubble breakage in which bubbles are compressed by narrowing the flow path from the inlet to the outlet and abruptly reducing the cross section of the inner passage of the blade. The second point is shear bubble breakage caused by rotation of the defoaming blade. The third point is a shower bubble breaker that sprays the broken liquid downward and far away.

  Of these, the first compression bubble breakage is determined by the opening ratio between the inlet and the outlet. The second shear bubble breakage is determined by the peripheral speed of the radially outer end of the defoaming blade. The third shower bubble breakage is determined by the peripheral speed at the radially outer end of the defoaming blade and the blade inclination.

JP-A-9-57010

  In the defoaming blade described in Patent Document 1, the opening shape of the inflow port and the discharge port is a rectangular shape, and since the inclination to the radially outer end in the cross-sectional shape of the flow path is small, The compression effect of direction is small.

  In addition, the structure of Patent Document 1 has only one defoaming blade attached to one defoaming device, so if you want to increase the defoaming capability, you can only change the size of the defoaming blade. I can't respond.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a defoaming device capable of further enhancing the foam compression effect and reducing the number of parts constituting the defoaming blade. There is.

In order to achieve the above object, the present invention provides the following means.
The defoaming device of the present invention includes a drive unit, a rotation shaft rotated by the drive unit, and a plurality of the defoaming devices that are provided on the rotation shaft and spaced in the circumferential direction. A defoaming vane having an inflow opening that opens to the outside and a discharge port that opens to the outside in the radial direction, the defoaming vane projecting radially outward from the rotating shaft and axially mutually A pair of plate members arranged at intervals, and a partition plate connecting the pair of plate members on the downstream side in the rotational direction, the pair of plate members having an axial interval in the radial direction The diameter gradually decreases toward the outside, the ends on the radially outer side are connected to each other , and the inlet is a triangle formed by the ends on the upstream side in the rotation direction of the pair of plate members and the outer peripheral surface of the rotating shaft. It is a shape .

According to the said structure, when the bubble which flows in from an inflow port moves toward a discharge port, it compresses by plate members which become small gradually as an axial direction space | interval goes to a radial direction outer side. Since the edge part of a board member is connected and the space | interval of the axial direction of the flow path of foam becomes narrower, the defoaming apparatus of the said structure can raise a compression effect more.
Moreover, since the defoaming blade is formed only by the pair of plate members and the partition plate, the number of parts constituting the defoaming blade can be reduced. That is, the defoaming blade can be formed more easily.

According to the above configuration, compared to the case where the inflow port has a rectangular shape, it is possible to increase the length in the radial direction while securing the area of the inflow port. The peripheral speed of the part increases. Thereby, the shear bubble breaking effect can be increased.
In addition, when the rectangular inlet and the axial length and the radial length are made the same, the opening area becomes small, so that the power can be reduced.

  The said defoaming apparatus WHEREIN: It is preferable that one of the edge parts of the rotation direction upstream side of a pair of said board member is offset and arrange | positioned at the said discharge port side.

  According to the said structure, since it opens toward the upper direction or the downward direction of an inflow port, the swallowing of the foam from the upper direction or the downward direction is attained. That is, more bubbles can flow in from the inlet.

The said defoaming apparatus WHEREIN: It is good also as a structure by which the said defoaming blade | blade arrange | positioned by the circumferential direction at intervals is provided with two or more spaced apart in the axial direction of the said rotating shaft.
According to the said structure, the improvement of a defoaming capability can be aimed at easily by increasing the number of defoaming blades.

According to the present invention, when the foam flowing in from the inflow port moves toward the discharge port, the bubbles are compressed by the plate members that gradually decrease in the axial direction toward the radially outer side. Since the edge part of a board member is connected and the space | interval of the axial direction of the flow path of foam becomes narrower, the defoaming apparatus of the said structure can raise a compression effect more.
Moreover, since the defoaming blade is formed only by the pair of plate members and the partition plate, the number of parts constituting the defoaming blade can be reduced. That is, the defoaming blade can be formed more easily.

It is the side view which carried out partial cross section of the defoaming device of the embodiment of the present invention. It is a perspective view of the defoaming blade | wing of the defoaming apparatus of embodiment of this invention. It is a top view of the defoaming blade | wing of the defoaming apparatus of embodiment of this invention. It is A arrow directional view of FIG. 3, Comprising: It is a side view of the defoaming blade | wing of the defoaming apparatus of embodiment of this invention. FIG. 4 is a side view of the defoaming blade of the defoaming apparatus according to the embodiment of the present invention, as viewed from the arrow B in FIG. 3. It is a perspective view of the modification of the defoaming apparatus of embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front sectional view showing a state in which the defoaming apparatus 1 is installed in a cylindrical processing tank 50 in which the liquid W to be processed is stored. The treatment tank 50 is provided in a part of equipment for concentrating the waste water to make it semi-solid, and finally incinerating, and the waste water to be treated W is supplied or discharged through the water supply / drainage device 51.
The waste water to be treated W includes, for example, ethylene glycol, a surfactant, adhesive components such as acrylamide and cyanoacrylate, etc., and bubbles generated by transportation, stirring, centrifugation, etc. Is floating on the surface of the water.

  The processing tank 50 in which the defoaming apparatus 1 is provided has a side wall 52 that surrounds the periphery and a slab 53 that covers the upper portion thereof, and an opening 54 formed in the center of the slab 53 has a cylindrical support portion 55. Is provided. A mounting base 56 is provided on the upper portion of the support portion 55, and the defoaming device 1 is supported by the mounting base 56. A drive motor 57 as a drive unit is provided at the center of the mounting base 56, and the defoamer 3 according to the present invention is attached to the rotating shaft 2 of the drive motor 57.

  The rotating shaft 2 of the drive motor 57 is arranged vertically in the upper center of the processing tank 50, and the defoaming body 3 is attached to the lower end of the rotating shaft 2 so as to be horizontal. The rotary shaft 2 is provided on the mounting base 56 so as to be movable in the vertical direction along the axis 2A. Between the upper position indicated by the two-dot chain line and the lower defoaming processing position indicated by the solid line. Can be moved.

  As shown in FIG. 2, FIG. 3, FIG. 4 and FIG. 5, the defoaming body 3 has a pair of defoaming blades 4 arranged at intervals in the circumferential direction of the rotating shaft 2. Each of the defoaming blades 4 is opened to the upstream side in the rotation direction R of the rotating shaft 2 and the inlet 5 into which the bubbles B flow in. 6. The defoamer 3 rotates with the inflow port 5 forward by the rotation of the rotating shaft 2.

The defoaming blade 4 is composed of a pair of plate members that are spaced apart from each other in the axial direction of the rotary shaft 2, and a partition plate 9 that connects the upper disk 7 and the lower disk 8. And have. The upper disk 7 and the lower disk 8 are plate-like members that are formed so as to protrude radially outward from the rotary shaft 2 and have a substantially triangular shape in plan view.
The upper disk 7, the lower disk 8, and the partition plate 9 are attached to a cylindrical base 10 attached to the rotary shaft 2.

The defoaming blade 4 forms a channel having a triangular cross section by three surfaces including the upper disk 7, the lower disk 8, and the partition plate 9.
The main surface of the lower disk 8 is formed so as to be orthogonal to the axis 2 </ b> A of the rotating shaft 2. The upper disk 7 is an inclined surface that is inclined with respect to the axis 2 </ b> A of the rotary shaft 2. The partition plate 9 is formed to be orthogonal to the lower disk 8.

  A flow path inlet 5 is formed between a front side in the rotational direction R of the upper disk 7 (hereinafter referred to as an upper front side 11) and a front side in the rotational direction of the lower disk 8 (lower front side 12). Yes. The inflow port 5 has a triangular shape including the upper front side 11 of the upper disk 7, the lower front side 12 of the lower disk 8, and the outer peripheral surface of the rotating shaft 2.

The lower front side 12 of the lower disk 8 is formed to form a straight line extending outward in the radial direction from the rotary shaft 2.
In the upper front side 11 of the upper disk 7, the inner side in the radial direction (hereinafter simply referred to as the radial direction) of the rotary shaft 2 recedes in the rotational direction R behind the lower front side 12 of the lower disk 8. Specifically, as shown in FIG. 3, the upper front side 11 of the upper disk 7 has a radially outer end 11 a that coincides with a radially outer end 12 a of the front side of the lower disk 8. The radially inner end portion 11b moves rearward in the rotational direction R from the radially inner end portion 12b of the lower disk 8.

Sides of the upper disk 7 and the lower disk 8 in the rotation direction R (hereinafter referred to as the rear side 13) are formed so as to form a straight line extending outward in the radial direction from the rotation shaft 2.
Further, the sides of the upper disk 7 and the lower disk 8 that are not connected to the rotating shaft 2 (hereinafter referred to as the side 14) are formed to be orthogonal to the lower front side 12. ing.

The vicinity of the portion where the rear side 13 and the side side 14 of the upper disk 7 and the lower disk 8 intersect has a shape that is cut off obliquely, and the discharge port 6 of the flow path is formed in this portion. .
The rear side 13 of the upper disk 7 and the rear side 13 of the lower disk 8 are connected via a partition plate 9. That is, the partition plate 9 is formed so as to face the foam B flowing in from the inflow port 5 and to guide the foam B to the discharge port 6.

  The upper disk 7 and the lower disk 8 are directly connected to each other at the side edges 14. As a result, the upper disk 7 and the lower disk 8 gradually approach from the radially inner side toward the radially outer side. That is, the upper disk 7 has an inclined surface that is inclined with respect to the horizontal.

The operation of the defoaming apparatus 1 configured as described above will be described.
As shown in FIG. 1, first, the defoaming body 3 is arranged between the liquid surface SW and the foam surface SB by adjusting the position in the vertical direction along the axis 2A of the rotating shaft 2. To do.
Thereafter, as indicated by an arrow R in FIG. 2, the defoaming body 3 is rotated by driving the rotating shaft 2 of the drive motor 57. Then, the bubbles B on the liquid W to be treated flow from the inlet 5 and are discharged from the outlet 6.

At this time, the upper disk 7 and the lower disk 8 are configured to gradually approach toward the outer side in the radial direction, so that the bubbles B flowing in from the inflow port 5 are reliably compressed and broken.
In addition, since the upper front side 11 of the upper disk 7 is arranged offset to the discharge port 6 side, the bubbles B are swallowed from above the inflow port 5.

On the other hand, when the inflow port 5 sucks bubbles, shear bubble breakage occurs due to the rotation of the defoaming blade 4. The suction force of the bubbles B at the inlet 5 is further increased by the occurrence of shear bubble breakage.
Further, since the upper disk 7 is inclined downward, the foamed foam B is sprayed downward and far away, and shower defoaming is performed.

According to the above embodiment, when the foam B flowing in from the inflow port 5 moves toward the discharge port 6, it is compressed by the upper disk 7 and the lower disk 8 whose axial interval gradually decreases as it goes radially outward. The In the defoaming device 1, the side edges 14 of the upper disk 7 and the lower disk 8 are connected to each other, and the interval between the bubbles in the axial direction becomes narrower. Therefore, the compression effect can be further enhanced.
Moreover, since the defoaming blade 4 is formed only by the upper disk 7, the lower disk 8 and the partition plate 9, the number of parts constituting the defoaming blade 4 can be reduced. That is, the defoaming blade 4 can be formed more easily.

Moreover, compared with the case where the inflow port 5 is made into a rectangular shape, the length in the radial direction can be made longer while securing the area of the inflow port 5. That is, the radial length of the inflow port 5 can be increased without increasing the resistance when rotating. Thereby, the peripheral speed of the edge part of the radial direction outer side of the defoaming blade | wing 4 becomes large. Thereby, the shear bubble breaking effect can be increased.
In addition, when the rectangular inflow port 5 and the axial length and the radial length are the same, the opening area becomes small, so that the power can be reduced.

  Moreover, since the inflow port 5 is opened upwards, it becomes possible to swallow bubbles from above. Thereby, more bubbles B can be processed.

Next, a defoaming device according to a modification of this embodiment will be described.
As shown in FIG. 6, in the defoaming body 3 </ b> B of the modified defoaming apparatus, a pair of defoaming blades 4 arranged at intervals in the circumferential direction of the rotating shaft 2 are separated in the axial direction of the rotating shaft 2. Two are provided. In other words, the modified defoaming body 3B has a configuration in which the defoaming body 3 of the embodiment is provided in two stages in the axial direction. Since the pair of defoaming blades 4 are attached to the rotary shaft 2 via the base portion 10, the number of attachments to the rotary shaft 2 can be increased.

According to the above modification, the defoaming ability can be easily improved by increasing the number of defoaming blades 4. Further, the defoaming blade 4 can be easily attached to the rotating shaft 2 via the cylindrical base 10.
In addition, the quantity of a pair of defoaming blade | wing 4 is not restricted to 2 steps | paragraphs, It can increase suitably according to the required defoaming capability.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. Moreover, the structure which combined the characteristic demonstrated by said several embodiment arbitrarily may be sufficient.
For example, in the above-described embodiment, the upper disk 7 is used as an inclined surface, and bubbles broken down are released. However, the lower disk 8 is used as an inclined surface, and bubbles broken up are released upward. It is good also as a structure.
Further, the number of the defoaming blades 4 is not limited to two. For example, three or more defoaming blades 4 may be attached to the rotary shaft 2.

DESCRIPTION OF SYMBOLS 1 Defoaming device 2 Rotating shaft 3, 3B Defoaming body 4 Defoaming blade 5 Inlet 6 Outlet 7 Upper disk (plate member)
8 Lower disc (plate member)
DESCRIPTION OF SYMBOLS 9 Partition plate 10 Base 11 Upper front edge 12 Lower front edge 13 Rear edge 14 Side edge 50 Treatment tank 51 Water supply / drainage device 52 Side wall 53 Slab 54 Opening part 55 Support part 56 Mounting stand 57 Drive motor (drive part)
B Bubble R Rotation direction W Liquid to be treated

Claims (3)

A drive unit;
A rotating shaft rotated by the driving unit;
A defoaming blade provided on the rotating shaft and having a plurality of holes arranged at intervals in the circumferential direction and having an inflow opening that opens upstream in the rotation direction of the rotating shaft and a discharge opening that opens radially outward. With
The defoaming blades project radially outward from the rotating shaft, and a pair of plate members arranged with an interval in the axial direction of the rotating shaft;
A partition plate connecting a pair of plate members on the downstream side in the rotational direction,
The pair of plate members are gradually reduced as the axial interval goes radially outward, and the radially outer ends are connected ,
The defoaming device, wherein the inflow port has a triangular shape including an end portion on the upstream side in the rotation direction of the pair of plate members and an outer peripheral surface of the rotation shaft .   2. The defoaming device according to claim 1, wherein one of the end portions on the upstream side in the rotation direction of the pair of plate members is arranged offset to the discharge port side. 3. The defoaming device according to claim 1, wherein a plurality of the defoaming blades arranged at intervals in the circumferential direction are provided apart from each other in the axial direction of the rotating shaft. apparatus.

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