JP2012076029A - Defoaming machine and defoaming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defoaming machine which can effectively perform defoaming irrespective of the properties and lamination conditions of foam and a defoaming method.SOLUTION: The defoaming machine includes a rotary drive mechanism 4a, a main defoaming blade 20 having a hollow structure which is attached to the rotary shaft 4 of the rotary drive mechanism 4a, a narrow port side opening 22 which sucks the foam, and a wide port side opening 23 which supplies the foam to the main defoaming blade 20. The periphery of the wide port side opening 23 is connected to the main defoaming blade 20. A suction mouth 21 whose cross section is narrowed as it is separated from the main defoaming blade 20 is included. The main defoaming blade 20 has an inflow port 7 in which the foam is made to flow into a hollow structure at the head of the advance direction during rotation and an outlet 8 in which the foam is discharged from the inside of the hollow structure near the centrifugal direction on the rear side of the advance direction in an area narrower than the inflow port 7.

Description

  The present invention relates to a defoamer and a defoaming method.

  In the activated sludge method used for purification in wastewater treatment facilities including human waste, sewage, etc., aeration in which oxygen is blown into the wastewater is performed, and bubbles are generated at the top of the wastewater. Wastewater, especially human waste, contains a high-viscosity polymer compound that promotes foaming, and thus foams easily during aeration, and a large amount of foam layers are formed. In addition, when the wastewater treatment without dilution is performed, high-viscosity bubbles generated in large quantities do not easily disappear, and it is necessary to take measures against defoaming.

  In connection with the above description, an antifoaming device is disclosed in Japanese Patent No. 2781751. FIG. 1 is a projection view for explaining the structure of a defoaming blade as an example of a defoaming apparatus, (a) is a plan view thereof, and (b) is a front view thereof. The defoaming blade in this example is composed of opposing plate-like bodies 1 and 2 that are arranged to face each other at an interval in the vertical direction, and a partition plate 3 provided between the plate-like bodies 1 and 2. The bodies 1 and 2 and the partition plate 3 constitute a bubble flow path 9 in the centrifugal direction, and the flow path 9 is configured to be narrowed sequentially in the centrifugal direction and downward. In addition, a collision body is provided to block the flow in the direction of travel of the liquid discharged from the bubble channel 9 or from the bubble channel 9. The defoaming blade has an inflow portion 7 and a discharge portion 8, and the rotational shaft 4 moves in the rotation direction A, so that the bubbles that enter the flow path 9 of the defoaming blade are compressed from the inflow direction 14 of the foam. It is destroyed and discharged in the liquid injection direction 13.

  FIG. 2 is a vertical cross-sectional view for explaining a state in which a defoaming blade, which is an example of a defoaming device, is mounted on a water tank. A foam surface 12 is formed on the liquid surface 11 of the water tank 10. The above-described defoaming blade is provided in a state in which the bubble surface 12 is matched. The rotating shaft 4 of the defoaming blade is connected to the drive unit 4a.

  In the defoaming device having such a configuration, the foam breaking function is not exhibited for the foam that is not at the position of the inflow portion 7 of the defoaming blade. In addition, when the foam does not cover the entire inflow portion 7 of the defoaming blade, the function of breaking bubbles by compression corresponding to the ratio of the area of the inflow portion 7 and the discharge portion 8 is not exhibited.

  Japanese Patent Application Laid-Open No. 2007-216113 discloses an antifoaming device. In this example, a rotor that rotates in a substantially horizontal plane is provided above the liquid surface, and the rotor includes an upper plate, a lower plate, and a plurality of fins arranged radially from the center of rotation between the upper and lower plates. And a foam suction port that is open at the rotation center of the lower plate, communicated with the foam suction port on the rotation center side of the rotor between the fins in the rotor, and a discharge port on the outer peripheral side of the rotor The defoaming path which has is formed.

  However, in this example, the foam suction force depends on the structure of the rotor rotating at high speed, and the foam suction port itself has no suction force. In such suction based on airflow, a strong airflow is necessary to increase the suction reliability in the case of highly viscous bubbles, etc., and as a result, bubbles move due to the influence of airflow turbulence. Thus, it becomes difficult to suck the bubbles effectively.

Japanese Patent No. 2781751 JP 2007-216113 A

  The problem to be solved by the present invention is to provide a defoaming machine and a defoaming method that can effectively defoam regardless of the nature of the foam and the state of lamination.

  In the following, means for solving the problems will be described using the reference numerals used in the embodiments for carrying out the invention in parentheses. This symbol is added to clarify the correspondence between the description of the claims and the description of the mode for carrying out the invention, and the technical scope of the invention described in the claims. Must not be used to interpret

  The defoamer according to the present invention includes a rotation drive mechanism (4a), a hollow main defoaming blade (20) attached to the rotation shaft (4) of the rotation drive mechanism (4a), and a narrow-side opening for sucking bubbles. (22) and a wide-mouth side opening (23) for supplying bubbles to the main defoaming blade (20), the periphery of the wide-mouth side opening (23) is connected to the main defoaming blade (20), A suction mouth (21) whose cross-sectional area becomes narrower in a direction away from the defoaming vane (20), and the main defoaming vane (20) allows bubbles to flow into the hollow structure at the head in the direction of travel during rotation. It has an inflow port (7) and a discharge port (8) through which bubbles are discharged from the inside of the hollow structure in a smaller area than the inflow port (7) and closer to the centrifugal direction on the rear side in the traveling direction.

  In the defoamer according to the present invention, the connection portion of the suction mouse (21) with the main defoaming blade (20) is located within the range including the inlet (7) in the centrifugal direction from the rotating shaft (4).

  The defoamer according to the present invention further includes a guide vane (32), and the guide vane (32) sucks into the inner surface (24), which is the surface close to the rotation axis (4) of the sucking mouse (21). It is arranged and provided so that the flow of bubbles is directed to the inlet (7) when the mouse (21) rotates.

  The defoamer according to the present invention further includes a blade (33), and the blade (33) is provided on the outer surface (25) which is a surface far from the rotation shaft (4) of the suction mouse (21). .

  The suction mouse (21) in the defoamer according to the present invention has a cross-section convex in a direction away from the main defoaming blade (20) when cut by a plane parallel to the rotation axis (4) and passing through the rotation axis (4). It becomes a shape.

  The centroid of the discharge port (8) in the defoamer according to the present invention is provided closer to the suction mouse (21) than the centroid of the inlet (7).

  The outermost peripheral part (P8) of the discharge port (8) in the defoamer according to the present invention has a distance from the center of the rotating shaft (4) in the centrifugal direction more than the outermost peripheral part (P7) of the inlet (7). In addition, the angle (α) formed by the inlet (7) and a line connecting the outermost peripheral portion of the inlet (7) and the outermost peripheral portion of the discharge port (8) is 90 degrees or less.

  The defoamer according to the present invention further includes a dividing plate (31), and the dividing plate (31) divides the inside of the main defoaming blade (20) in a direction substantially perpendicular to the rotation axis (4). In any of the plurality of flow paths from the inlet (7) to the outlet (8) to be formed, the outlet (8) is smaller in area than the inlet (7).

  The defoamer according to the present invention further includes a foam level meter (34), and the rotational drive mechanism (4a) is controlled by the foam level (L1, L2, and L3) measured by the foam level meter (34). ) Is changed.

  Further, the defoamer according to the present invention has a bubble level (L3) in which all the inflow ports (7) are covered, a bubble surface level (L2 to L3) in which the inflow ports (7) are partially covered, It is comprised so that rotation speed (N) may be accelerated in order of the bubble surface level (L1-L2) where all the inlets (7) are not covered.

  And the periphery (1, 2, and 3) of the inflow port (7) in the defoamer by this invention comprises the pointed edge shape.

  In the defoaming method according to the present invention, the rotation drive mechanism (4a) drives the rotating shaft (4) to which the main defoaming blade (20) having a hollow structure is attached, the narrow-side opening (22), A suction mouth having a wide mouth side opening (23), the peripheral edge of the wide mouth side opening (23) is connected to the main defoaming blade (20), and the cross-sectional area becomes narrower in a direction away from the main defoaming blade (20) (21) rotates and sucks bubbles from the narrow mouth side opening (22), and the suction mouse (21) moves from the wide mouth side opening (23) in the traveling direction when the main antifoaming blade (20) rotates. Supplying the foam to the leading inlet (7) of the liquid, the main antifoaming blade (20) flowing the supplied foam from the inlet (7) into the hollow structure, and the main antifoaming blade ( 20) is narrower than the inflow port (7) and is located near the centrifugal direction at the rear of the traveling direction. A step in which bubbles are guided to the outlet (8) from which the bubbles are discharged from within the structure, and the main defoaming blade (20) is closer to the suction mouse (21) than the centroid of the inlet (7) Discharging bubbles from a discharge port (8) provided in the heart.

  The step of the suction mouse (21) supplying the foam to the inflow port (7) in the defoaming method according to the present invention is a position within the range including the inflow port (7) in the centrifugal direction from the rotating shaft (4). Done.

  The step of supplying the foam to the inflow port (7) by the suction mouse (21) in the defoaming method according to the present invention includes the step of supplying the foam to the inner surface (24) which is the surface close to the rotation axis (4) of the suction mouse (21). ) Includes supplying the foam by guide vanes (32) arranged and arranged so that the foam flow (27) is directed towards the inlet (7) when the suction mouse (21) rotates.

  Further, the step of supplying the foam to the inflow port (7) by the suction mouse (21) in the defoaming method according to the present invention is the step of supplying the foam (21) to the outer surface (25) which is the surface far from the rotation axis (4). ) Shearing the foam by means of vanes (33) provided in

  In the defoaming method according to the present invention, the step in which the main defoaming blade (20) induces bubbles to the discharge port (8) is substantially perpendicular to the rotation axis (4) in the main defoaming blade (20). In any of the plurality of flow paths (9) from the inlet (7) to the outlet (8) formed by the dividing plate (31) divided in the direction, the outlet (8) having a smaller area than the inlet (7) ) Inducing bubbles.

  Moreover, the defoaming method according to the present invention further changes the rotation speed (N) of the rotation drive mechanism (4a) by the foam surface level (L1, L2, and L3) measured by the foam surface level meter (34). Comprising steps.

  Further, the defoaming method according to the present invention further includes a foam level (L3) in which the inflow port (7) is entirely covered, and a foam level (L2 to L3) in which the inflow port (7) is partially covered. And a step of controlling to increase the rotational speed (N) in the order of the bubble level (L1 to L2) where all the inflow ports (7) are not covered.

  The step of the main defoaming blade (20) in the defoaming method according to the present invention flowing the foam into the hollow structure from the inflow port (7) is performed at the periphery of the inflow port (7) having a sharp edge shape. Shearing.

  The computer program according to the present invention causes a computer to execute the defoaming method according to the present invention.

  The defoamer according to the present invention has a recording medium for storing a program for causing a computer to execute the defoaming method according to the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the defoaming machine and defoaming method which can defoam effectively irrespective of the property of a foam, and the lamination | stacking condition.

FIG. 1 is a projection view for explaining the structure of a defoaming blade as an example of a defoaming apparatus, (a) is a plan view thereof, and (b) is a front view thereof. FIG. 2 is a vertical cross-sectional view for explaining a state in which a defoaming blade, which is an example of a defoaming device, is mounted on a water tank. FIG. 3 is a longitudinal sectional view showing an example of a state in which the defoamer according to the embodiment of the present invention is attached to the water tank. FIG. 4 is a perspective view showing an example of the structure of the defoaming blade of the defoamer according to the first embodiment of the present invention. FIG. 5A is a plan view showing an example of the structure of the defoaming blade of the defoamer according to the first embodiment of the present invention. FIG. 5B is a front view showing an example of the structure of the defoaming blade of the defoaming machine according to the first embodiment of the present invention. FIG. 5C is a bottom view showing an example of the structure of the defoaming blade of the defoaming machine according to the first embodiment of the present invention. FIG. 5D is a cross-sectional view showing an example of the structure of the defoaming blade of the defoamer according to the first embodiment of the present invention. FIG. 6 is a plan view showing an example of the structure of the main defoaming blade of the defoamer according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view showing the centrifugal force acting on an example of the suction mouse of the defoamer according to the first embodiment of the present invention. FIG. 8: is sectional drawing which shows an example of the effect | action by the defoaming blade | wing of the defoamer in the 1st Embodiment of this invention. FIG. 9 is a schematic diagram showing a relationship between an example of the structure of the defoaming blade of the defoamer and the state of foam lamination in the embodiment of the present invention. FIG. 10 is a schematic view showing an example of the bubble breaking action by the structure of the main defoaming blade of the defoamer in the embodiment of the present invention. FIG. 11A is a plan view showing an example of the structure of the defoaming blade of the defoamer according to the second embodiment of the present invention. FIG. 11B is a side sectional view showing an example of the structure of the defoaming blade of the defoamer according to the second embodiment of the present invention. FIG. 12: is sectional drawing which shows an example of the structure of the defoaming blade | wing of the defoamer in the 3rd Embodiment of this invention. FIG. 13A is a bottom view showing an example of the structure of the defoaming blade of the defoaming machine according to the fourth embodiment of the present invention. FIG. 13B is a cross-sectional view showing an example of the structure of the defoaming blade of the defoamer according to the fourth embodiment of the present invention. FIG. 14: is a longitudinal cross-sectional view which shows an example of the structure of the defoamer in the 5th Embodiment of this invention. FIG. 15A is a projection view illustrating a first modification of the structure of the suction mouse of the defoamer according to the embodiment of the present invention. FIG. 15B is a projection view illustrating a second modification of the structure of the suction mouse of the defoamer according to the embodiment of the present invention. FIG. 15C is a projection view illustrating a third modification of the structure of the suction mouse of the defoamer according to the embodiment of the present invention. FIG. 15D is a projection view illustrating a fourth modification of the structure of the suction mouse of the defoamer according to the embodiment of the present invention.

(First embodiment)
Hereinafter, a defoaming machine and a defoaming method according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, the configuration of the defoamer according to the first embodiment of the present invention will be described in detail.

  FIG. 3 is a longitudinal sectional view showing an example of a state in which the defoamer according to the embodiment of the present invention is attached to the water tank. Referring to FIG. 3, the main defoaming blade 20 and the suction mouse 21 according to the present embodiment are provided so as to be positioned between the liquid surface 11 in the water tank 10 and the foam surface 12 formed on the top thereof. ing. A suction mouth 21 is provided on the liquid level side of the main defoaming blade 20, and a rotating shaft 4 of a driving machine 4 a such as a submersible motor which is a rotation driving mechanism is connected to the opposite side. A rotating shaft 4 for rotating the main defoaming blade 20 and the suction mouse 21 extends in a direction perpendicular to the liquid surface 11. And when the rotating shaft 4 moves with the drive machine 4a, the main defoaming blade | wing 20 and the suction mouse | mouth 21 are comprised so that it may rotate integrally in the liquid surface 11 and a parallel direction. Preferably, although the main defoaming blade 20 and the suction mouse 21 are in a state of rotating in the bubble, the bubble surface 12 moves up and down depending on the generation state of the bubble. In addition, the defoamer by this embodiment is applicable to both the water tank 10 of opening and sealing. Moreover, the defoaming machine by other embodiment is similarly mounted | worn with and used for a water tank.

  FIG. 4 is a perspective view showing an example of the structure of the defoaming blade of the defoamer according to the first embodiment of the present invention. Referring to FIG. 4, the defoaming blade according to the present embodiment has a structure in which a main defoaming blade 20 and a suction mouse 21 are connected. And the main defoaming blade | wing 20 contains the plate-shaped bodies 1 and 2, and the partition plate 3, and the suction mouse | mouth 21 has the narrow mouth side opening 22 (suction mouth) and the wide mouth side opening 23 (outlet mouth). Have. The narrow opening 22 and the wide opening 23 communicate with each other.

  The plate-like bodies 1 and 2 are attached so as to extend in the centrifugal direction that is substantially perpendicular to the rotating shaft 4. Further, the plate-like body 2 is located closer to the distal end side of the rotation shaft 4 than the plate-like body 1. The plate-like bodies 1 and 2 have a substantially triangular shape in which the distance in the circumferential direction increases linearly as the distance from the rotating shaft 4 increases, that is, the radial direction (radial direction) advances toward the outer peripheral side (centrifugal direction). ing. The plate-like body 1 and the plate-like body 2 are opposed to each other, and a rectangular partition plate 3 is provided therebetween so as to be orthogonal to the plate-like body 2.

  The suction mouse 21 has a hollow structure in which the cross-sectional area becomes narrower from the wide-mouth side opening 23 toward the narrow-mouth side opening 22 in a direction away from the extinguishing blade unit 20. Preferably, the suction mouse 21 is provided concentrically with the rotating shaft 4. And the unit 2 of the defoaming blade of this embodiment is formed by connecting the plate-like body 2 of the main defoaming blade 20 and the peripheral edge of the wide mouth side opening 23 of the suction mouse 21 to form an integral body. .

  FIG. 5 is a schematic view showing an example of the structure of the defoaming blade of the defoamer according to the first embodiment of the present invention, FIG. 5A is a plan view thereof, FIG. 5B is a front view thereof, and FIG. 5D is a cross-sectional view taken along the line CC ′ of FIG. 5A. Referring to FIG. 5A, the unit of the defoaming blade by the main defoaming blade 20 and the suction mouse 21 is on the side of the rotary shaft 4 in which the plate-like body 1, the wide mouth side opening 23, and the inner surface 24 side of the suction mouse can be seen. It is configured to rotate in the clockwise rotation direction A as viewed from the viewpoint.

  On the FIG. 5A, the plate-like body 2 described above is hidden behind the plate-like body 1 and cannot be seen. In the region sandwiched between the plate-like body 1 and the plate-like body 2, the above-described partition is provided for each of the surface located on the rear side in the traveling direction during rotation of the main antifoaming blade 20 and the surface located on the centrifugal side. A plate 3 is provided and closed. Thus, the main defoaming blade 20 is formed with a hollow structure surrounded by the plate-like body 1, the plate-like body 2, and the partition plate 3, and the hollow region becomes the bubble flow path 9. On the other hand, a hole 7 is formed at the head in the traveling direction at the time of rotation of the main defoaming blade 20 to form an inflow port 7 into which bubbles flow into the hollow structure. Similarly, a hole is also formed between the partition plate 3 on the rear side of the main antifoaming blade 20 and the partition plate 3 on the side of the centrifugal side so that the inside of the hollow structure is formed. A discharge port 8 through which bubbles are discharged is formed. The discharge port 8 formed closer to the centrifugal direction behind the main defoaming blade 20 in the traveling direction is an opening having a smaller area than the inflow port 7. The inflow port 7 and the discharge port 8 are connected by a bubble channel 9. In the present embodiment, although the foam flow path 9 having a rectangular cross section having a hollow structure surrounded by the plate-like body 1, the plate-like body 2 and the partition plate 3 is used, the flow path 9 is used. May have a circular cross section, for example.

  The inner surface 24 is exposed on the wide mouth side opening 23 side of the suction mouse 21, and the portions other than the portion overlapping the plate-like body 2 and the rotation shaft 4 are in the open state in the axial direction.

  When the main defoaming blade 20 and the suction mouse 21 having such a configuration rotate in the rotation direction A, the main defoaming blade 20 enters from the inflow port 7 in the foam inflow direction 14 indicated by the arrow in the figure. Bubbles are taken in, and the liquid broken in the liquid (foam) injection direction 13 is discharged from the discharge port 8.

  Referring to FIG. 5B, the positional relationship between the inlet 7 and the outlet 8 and the area of each are shown. The plate-like body 2 is provided perpendicular to the rotation shaft 4. On the other hand, the plate-like body 1 is provided so that the distance from the plate-like body 2 becomes narrower as the side hitting the head in the traveling direction is orthogonal to the rotation axis 4 and the side hitting the rear side advances in the centrifugal direction. Yes. The plate-like body 1 is also provided so that the side located on the centrifugal side also has a shorter distance from the plate-like body 2 as it advances from the head in the traveling direction to the rear side. Therefore, the shape of the partition plate 3 is a trapezoid. Thus, the main defoaming blade 20 is formed so that the centroid which is the center of the rectangle of the discharge port 8 is closer to the suction mouse 21 than the centroid of the inflow port 7. The inlet 7 has an area with a radial dimension B and an axial dimension H, and the outlet 8 has an area with a radial dimension Bd and an axial dimension Hd. is doing. Preferably, about 1/4 of the area of the inflow port 7 is effective as the area of the discharge port 8.

  The inflow port 7 is surrounded by the plate-like body 1, the plate-like body 2, the partition plate 3, and the rotating shaft 4. Thin plates are used for the plate-like body 1, the plate-like body 2, and the partition plate 3 at the periphery of the inflow port 7. Therefore, each of the peripheral edges of the inflow port 7 has a sharp edge shape.

  Further, an inner region 26 of the sucking mouse 21 is formed in a space surrounded by the narrow mouth side opening 22 and the wide mouth side opening 23 of the sucking mouse 21 and the inner surface 24 of the sucking mouse 21 therebetween. When the suction mouse 21 rotates, bubbles flow through the inner region 26. The dimension of the suction mouse 21 in the axial direction is h.

  Referring to FIG. 5C, on FIG. 5A, the plate-like body 2, the narrow mouth side opening 22, and the outer surface 25 of the suction mouse 21, which are hidden by the front side components, are shown. The unit of the defoaming blade by the main defoaming blade 20 and the suction mouse 21 is a counterclockwise rotation direction A when viewed from the side where the plate-like body 2, the narrow mouth side opening 22 and the outer surface 25 of the suction mouse 21 can be seen. Turn around. Assuming that the diameter of the wide opening 23 is d1 and the diameter of the narrow opening 22 is d2, the relationship is d1> d2, as described above.

  Referring to FIG. 5D, the positional relationship between the main defoaming blade 20 and the suction mouse 21 is shown by a cross-sectional view taken along C-C ′ in FIG. 5A. Here, an example is shown in which main antifoaming blades 20 are provided at positions that are point-symmetric about the rotation axis 4. Diameter when point P, which is in contact with the plate-like body 2 and is the most centrifugal portion (the outermost peripheral portion during rotation), rotates around the rotation axis 4 in the region of the inlet 7 of the main defoaming blade 20 Becomes D. Note that when the inflow port 7 is rectangular, the point P coincides with the above-described point P7. Further, as described above, the dimension of the inflow port 7 in the radial direction is B, and the diameter of the wide-mouth side opening 23 of the suction mouse 21 is d1.

  The peripheral edge of the wide-mouth side opening 23 of the suction mouse 21 that is a connection portion with the main defoaming blade 20 is provided so as to be located in a range including the inflow port 7 on the centrifugal direction side from the rotating shaft 4. In other words, the diameter d1 of the wide-mouth side opening 23 of the suction mouse 21 is larger than the diameter of the rotary shaft 4 and is equal to or smaller than the diameter D when the point P rotates around the rotary shaft 4. That is, the peripheral edge of the wide mouth side opening 23 of the suction mouse 21 is connected to the main defoaming blade 20 under the condition of D> = d1> (D-2B).

  More preferably, it is a condition that the area of the inlet 7 on the rotating shaft 4 side is larger than the area of the outlet 8 than the peripheral edge of the wide-mouth opening 23 that is a connection part with the main defoaming blade 20. A wide-mouth side opening 23 is provided in connection with the main defoaming blade 20 at a position on the centrifugal side. That is, the wide mouth side opening 23 of the suction mouse 21 is connected to the main defoaming blade 20 under the condition of {B− (D−d1) / 2} × H> Bd × Hd.

  FIG. 6 is a plan view showing an example of the structure of the main defoaming blade of the defoamer according to the first embodiment of the present invention. Referring to FIG. 6, a more preferable form of the main defoaming blade according to the present embodiment is shown. Here, an axial center line 4X extending in the centrifugal direction from the center of the rotating shaft 4 is assumed. And the state where the virtual surfaces 7a formed by the plate-like bodies 1 and 2 forming the inflow port 7 and the partition plate 3 are positioned in parallel to the axial center line 4X is shown. The distance (radius) r8 from the center of the rotating shaft 4 to the outermost peripheral portion P8 of the discharge port 8 is equal to or longer than the distance r7 from the center of the rotating shaft 4 to the outermost peripheral portion P7 of the inflow port 7. In other words, the outermost peripheral portion P8 of the discharge port 8 is the same as the outermost peripheral portion P7 of the inflow port 7 or passes through the outer periphery. That is, the condition r8> = r7 holds.

  Moreover, in the outermost peripheral part P7 of the inflow port 7, the virtual surface 3a of the partition plate 3 extended to the discharge port 8 side orthogonally to the virtual surface 7a is assumed. An angle α formed by the plate-like body 1 or 2 on the inlet 7 side and the partition plate 3 is set to 90 degrees or less. In other words, the angle formed by the virtual surface 7a and the partition plate 3 is 90 degrees or less of the angle formed by the virtual surface 7a and the virtual surface 3a. That is, the condition of α <= 90 degrees holds.

  FIG. 7 is a cross-sectional view showing the centrifugal force acting on an example of the suction mouse of the defoamer according to the first embodiment of the present invention. Referring to FIG. 7, a cross section viewed from the front of the suction mouse 21 according to the present embodiment is schematically shown. The suction mouse 21 rotates at a constant rotation speed N around the rotation axis 4. The distance (radius) r (1r) from the center of the rotation axis 4 and the position where it is twice (2r), 3 times (3r), 4 times (4r), and 5 times (5r) are P1, P2, P3, respectively. , P4, and P5. The centrifugal force G is proportional to the square of the rotational speed N in proportion to the radius r. Therefore, the centrifugal force G is proportional to the radius r when the rotational speed N is constant. For example, the position P5 in the sucking mouse 21 receives five times the force of the position P1 in the sucking mouse 21. become. The component force Gc of the centrifugal force G received along the inner surface 24 of the sucking mouse 21 is Gc = G × cos β using the degrees β formed by the inner surface 24 of the sucking mouse 21 and the centrifugal direction.

  Since the centrifugal force G increases as it approaches the wide-mouth side opening 23 from the narrow-mouth side opening 22, it is possible to effectively suck in bubbles by designing the component force Gc so as to be close to the rotation axis 4. Therefore, when the suction mouse 21 shown in FIG. 7 is viewed from the side, the shape is a so-called saddle shape that is convex in the direction away from the wide-mouth side opening 23, that is, when it is cut by a plane parallel to the rotation axis and passing through the rotation axis. A convex shape in a direction in which the cross-sectional shape is away from the main defoaming blade 20 is suitable for efficiently sucking bubbles.

  Next, the operation of the defoamer according to the first embodiment of the present invention will be described in detail.

  FIG. 8: is sectional drawing which shows an example of the effect | action by the defoaming blade | wing of the defoamer in the 1st Embodiment of this invention. Referring to FIG. 8, the foam stacking level and the foam flow during the rotating operation of the defoaming vane unit are shown. Here, for the bubbles stacked in the direction perpendicular to the axial direction, the narrow mouth side opening 22 of the suction mouse 21 is set to the foam stacking level L1, and the side of the inlet 7 on the plate-like body 2 side is set to the foam stacking level L2. The side on the plate-like body 1 side of the inflow port 7 is defined as a foam stacking level L3.

  As described above, the rotating shaft 4 connected to the unit of the defoaming blades composed of the main defoaming blade 20 and the suction mouse 21 is rotated in the rotation direction A as shown in FIG. Bubbles with a bubble level between L2 and L3 enter the bubble channel 9 from the inlet 7 to the outlet 8 by the rotating main defoaming blade 20. Due to the sharp edge shape of the peripheral edge of the inflow port 7, the foam hitting the peripheral edge receives a shearing force from the peripheral edge during inflow and breaks the foam. The bubble (liquid) reaching the discharge port 8 is indicated by an arrow in the drawing as the liquid (bubble) injection direction 13 depending on the configuration in which the centroid of the discharge port 8 is closer to the suction mouse 21 than the centroid of the inflow port 7. As shown, the bubbles are blown in the direction L1 and the centrifugal direction. The bubbles (liquid) are discharged from the discharge port 8 by centrifugal force, so that the subsequent bubbles are introduced from the inflow port 7 without stagnation. In this manner, the foam is compressed by the structure in which the discharge port 8 is narrower than the inflow port 7 and the centrifugal force received when the discharge port 8 is provided in the centrifugal direction from the inflow port 7 in the bubble flow path 9. Is broken. Further, the liquid (bubbles) blown in the liquid (bubble) injection direction 13 collides with the bubbles on the bubble surface 12 shown in FIG. 3 and breaks them.

  In a configuration in which the bubble level is between L1 and L2 and the suction mouse 21 is not included, the main defoaming blade 20 idles and does not affect the bubble, so that the bubble breaking action is not exhibited. However, in the configuration according to the present embodiment, bubbles touching the rotating suction mouse 21 flow from the narrow mouth side opening (suction port) 22 side to the wide mouth side opening (discharge port) 23 side due to the centrifugal effect. That is, when the suction mouse 21 according to the present embodiment rotates, the same effect as the suction of the pump is exhibited, and the suction effect is generated in the suction mouse 21 itself.

  The bubbles sucked into the inner region 26 of the sucking mouse 21 travel along the inner surface 24 of the sucking mouse 21 to the wide-mouth side opening 23 as indicated by an arrow in the drawing as the foam flow direction 27 on the inner surface 24 of the sucking mouse 21. It arrives. The foam reaching the wide-mouth side opening 23 is introduced into the foam flow path 9 from the inlet 7 of the main defoaming blade 20 in the same manner as the foam having a foam surface level between L2 and L3 described above and breaks. After being bubbled, it is blown from the discharge port 8 in the centrifugal direction of the liquid (bubble) injection direction 13.

  On the other hand, the bubble that has touched the outer surface 25 of the sucking mouse 21 passes along the outer surface 25 of the sucking mouse 21 as indicated by an arrow in the drawing as the bubble flow direction 28 on the outer surface 25 of the sucking mouse 21. Flows to the side. The bubbles flowing on the outer surface 25 of the suction mouse 21 are sheared by the frictional force with the outer surface 25 and a part of the bubbles is broken. A part of the bubbles flowing on the outer surface 25 of the suction mouse 21 is introduced into the bubble channel 9 from the inlet 7 of the main defoaming blade 20 and is discharged from the outlet 8 like the bubbles flowing on the inner surface 24 described above. It is blown in the centrifugal direction of the jet direction 13 of (bubbles). The other bubbles flowing on the outer surface 25 of the suction mouse 21 are blown away in the centrifugal direction of the liquid (bubble) scattering direction 29.

  As described above, the liquid (bubbles) blown in the liquid (foam) jetting direction 13 and the liquid (bubble) splashing direction 29 are derived from the bubbles having the bubble level between L1 and L2. Collide with the bubbles on the bubble surface 12 shown in 3 to break them.

  In addition, the efficiency of the suction of the bubbles by the suction mouse 21 increases so that the compression bubble breaks in the bubble flow path 9 of the defoaming blade 20. A void is formed by the compression bubble breakage in the bubble flow path 9 to cause a pressure difference. A suction force is generated by the generated pressure difference. This suction force increases as the foam viscosity increases. Due to this suction force, the suction mouse 21 sucks bubbles further. Thus, the unit of the defoaming blade by the main defoaming blade 20 and the suction mouse | mouth 21 by this embodiment has the synergistic effect by a combination.

  The main defoaming blade 20 according to the present embodiment does not have a suction function. Moreover, it has the characteristic that the load at the time of rotation (idling) of the main defoaming blade | wing 20 in the state where the bubble breakage is not performed is very small. Therefore, the power of the driving machine 4a required for the rotation of the main defoaming blade 20 according to the present embodiment is small, and the structure can break bubbles effectively with a small amount of energy input.

  FIG. 9 is a schematic diagram showing a relationship between an example of the structure of the defoaming blade of the defoamer and the state of foam lamination in the embodiment of the present invention. Referring to FIG. 9, similarly to FIG. 8 described above, a unit of a defoaming blade by a main defoaming blade 20 that rotates in the rotation direction A and a suction mouse 21 is schematically shown. Here, the area of the inlet 7 of the main defoaming blade 20 is S, La is between the bubble surface levels L2 and L3, Lb is between the bubble surface levels L1 and L2, and between the bubble surface levels L1 and L3. Is defined as Lc.

  In the case where the bubble level is L3 and La of all regions in the inlet 7 of the main defoaming blade 20 is covered with foam, the inlet 7 having an area S (= B × H), and the inlet The compression bubble breaking effect as designed corresponding to the area ratio with the discharge port 8 having an area smaller than 7 is exhibited in the bubble flow path 9. On the other hand, even when the foam level is between L2 and L3 and a part of the inlet 7 of the main defoaming blade 20 is covered with foam, the foam is compressed in the foam flow path 9. Although the foam is broken, it does not reach the compression bubble breaking effect of the foam corresponding to the area ratio between the inlet 7 and the outlet 8. However, in this embodiment, bubbles in the Lb region are supplied from the wide-mouth side opening 23 of the suction mouse 21 to the inflow port 7 to increase the amount of bubbles, thereby increasing the compression bubble breaking effect.

  In addition, in the case where the foam level is between L2 and L3 due to the configuration in which the foam is sucked into the inner surface 24 of the suction mouth 21 and introduced into the main defoaming blade 20, the liquid is discharged from the discharge port 8. The amount of liquid (bubbles) blown in the (foam) injection direction 13 is increased, and the bubble breaking effect is enhanced.

  As described above, in the configuration not including the suction mouse 21, the La region is broken, whereas in the configuration according to the present embodiment, the Lc region including the Lb region in addition to the La region is used. Defoaming action is demonstrated. Further, in the configuration according to the present embodiment, the effect of breaking bubbles is increased even for bubbles in the La region. In other words, in the defoamer of this embodiment, the bubble breaking function is exhibited even for bubbles that are not at the position of the inflow portion 7 of the defoaming blade. In addition, even when the foam does not cover the entire inflow portion 7 of the defoaming blade, the function of breaking bubbles by compression corresponding to the area ratio between the inflow portion 7 and the discharge portion 8 is exhibited.

  FIG. 10 is a schematic view showing an example of the bubble breaking action by the structure of the main defoaming blade of the defoamer in the embodiment of the present invention. Referring to FIG. 10, it is shown that the force acting on the foam 30 by the defoamer according to the present embodiment has mainly three functions. The first is the plate-like body 1 at the inlet 7 of the main defoaming blade 20 and the shear bubble def1 of the foam 30 due to the edges of 2. The second is the compression bubble breakage def2 of the foam 30 in the flow path 9 of the main defoaming blade 20. The third is bubble def3 due to the spray impact of the liquid sprayed from the discharge port 8 in the centrifugal direction.

  In this way, the foam effectively supplied to the main defoaming blade 20 is effectively broken by the three functions described above.

  The defoaming machine according to the present embodiment has a configuration in which the main defoaming blade 20 itself has no suction force, and even if it rotates in the air, there is no function as a so-called fan. It has a feature that does not require. The bubble breaking function is exhibited only after the bubbles are supplied to the main defoaming blade 20. Therefore, in order for the defoamer by this embodiment to function effectively, it is necessary to supply a bubble to the main defoaming blade | wing 20 effectively. For this reason, the suction mouth 21 of the defoaming machine according to the present embodiment has a suction function as a function of the suction mouth 21 itself that rotates as a structure that expands the cross-sectional area toward the main defoaming blade 20. To effectively supply foam.

  The defoamer according to the present embodiment has an effect that the sucking mouth 21 of the defoamer efficiently sucks the surrounding bubbles regardless of the properties of the bubbles because the bubbles are not sucked by the airflow.

  The defoaming machine and the defoaming method according to the present embodiment have been described above.

  In this embodiment, the foam of the range which the main defoaming blade | wing 20 cannot take in alone is taken in effectively, and it has an effect which expands the range which an antifoamer acts on. For example, in the process in which bubbles increase from L1 to L2, the bubbles that have reached the suction mouse 21 can be broken before the bubbles reach the main defoaming blade 20. .

  Moreover, in this embodiment, it has the effect which raises the efficiency which a defoamer acts by supplying foam to the inflow port 7 from the suction mouth 21. FIG.

(Second Embodiment)
Hereinafter, a defoaming machine and a defoaming method according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, the structure of the defoamer by the 2nd Embodiment of this invention is demonstrated in detail.

  FIG. 11 is a projected view showing an example of the structure of the defoaming blade of the defoamer according to the second embodiment of the present invention, FIG. 11A is a plan view thereof, and FIG. 11B is a side view thereof. Referring to FIG. 11A, the main defoaming blade in the present embodiment further includes a dividing plate 31 in addition to the main defoaming blade of the first embodiment. The dividing plate 31 has a shape similar to the plate-like body 1 and the plate-like body 2. The dividing plate 31 is a partition plate between the plate-like body 1 and the plate-like body 2, the surface located on the rear side in the traveling direction when the main defoaming blade 20 rotates and the surface located on the centrifugal side. 3 extends in the region from the inlet 7 to the outlet 8. In other words, the dividing plate 31 is provided so as to divide the main defoaming blade 20 in a direction substantially perpendicular to the rotation shaft 4.

  The dividing plate 31 according to the present embodiment has an area of the discharge port 8 from the inlet 7 in any of a plurality of flow paths from the inlet 7 to the outlet 8 formed by dividing the inside of the main defoaming blade 20. Provided to be narrow. And it is comprised so that foam compression may be performed reliably in any flow path. Thus, if the coefficient by the division | segmentation by the side of the inflow port 7 when the bubble flow path 9 is divided | segmented is defined with m, the dimension of the axial direction in one inflow port 7 of the division | segmentation will be H / m. Further, when the coefficient by the division on the discharge port 8 side is defined as n, the axial dimension of one of the divided discharge ports 8 is Hd / n. Therefore, the dividing plate 31 is provided so that m and n satisfy B × H / m> Bd × Hd / n. The area ratio between the inlet 7 and the outlet 8 is appropriately changed according to the required bubble breaking action, that is, the type of foam. There is no particular limitation on the number of divisions.

  FIG. 11 shows an example in which the bubble channel 9 is equally divided into three by two dividing plates 31. Referring to FIG. 11B, the cross-sectional areas of the three bubble channels divided by the two divided plates 31 gradually become narrower from the inlet 7 toward the outlet 8 as well. In this way, when the divisions are equally spaced, m = n, so that there is no problem with the area ratio between the inlet 7 and the outlet 8.

  Next, the operation of the defoamer according to the second embodiment of the present invention will be described in detail.

  8 and FIG. 9 described above, when the foam layer level is between L2 and L3, and the area of the foam covering the inflow port 7 is B × H / m, the dividing plate 31 is provided. The area of the discharge port 8 in the configuration that is not provided is Bd × Hd. In this case, the area of the discharge port 8 may be larger than the area of the inflow port 7. That is, B × H / m <= Bd × Hd. This relationship is more easily adapted as the bubble stacking level approaches L2.

  Here, the area of the discharge port 8 is reduced to Bd × Hd / n by providing the dividing plate 31 according to the present embodiment. When the area of the discharge port 8 is reduced, the possibility that the area of the foam covering the inflow port 7 becomes wider is increased. That is, the possibility of satisfying B × H / m> Bd × Hd / n increases. If m = n at this time, the area ratio between the inlet 7 and the outlet 8 is the same as when all the inlets 7 are covered with bubbles, and the compression bubble breaking effect as designed is the flow of bubbles. It is demonstrated in the road 9.

  Thus, in this embodiment, even when there are few bubbles by the structure in which the predetermined area ratio between the inlet 7 and the outlet 8 in the flow path 9 of each bubble obtained by dividing the main defoaming blade 20 is maintained, The foam taken into the main defoaming blade 20 is efficiently compressed.

  Even if this embodiment is implemented independently, it has the effect of raising the efficiency of bubble breaking. However, this embodiment breaks the bubbles supplied from the suction mouse 21 more effectively by combining with the suction mouse 21 according to the first embodiment.

  The defoaming machine and the defoaming method according to the present embodiment have been described above.

  In this embodiment, it has the effect that an effective compression bubble breaks regardless of the quantity of the foam supplied to the inflow port 7.

(Third embodiment)
Hereinafter, a defoaming machine and a defoaming method according to a third embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, the structure of the defoamer by the 3rd Embodiment of this invention is demonstrated in detail.

  FIG. 12: is sectional drawing which shows an example of the structure of the defoaming blade | wing of the defoamer in the 3rd Embodiment of this invention. Referring to FIG. 12, the defoaming blade according to the present embodiment is provided with a guide blade 32 in the inner region 26 of the suction mouse 21. The guide vane 32 has a function corresponding to an impeller (impeller) in the pump as the suction mouse 21 rotates. The direction of the flow by the guide vanes 32 is a bubble flow direction 27 on the inner surface 24 of the suction mouth 21 from the narrow mouth side opening 22 to the wide mouth side opening 23.

  In FIG. 12, two flat guide blades 32 are illustrated. However, the shape of the guide vane 32 may be a screw shape or the like, and the shape of the guide vane 32 depending on the number and the shape that captures and accelerates the bubble in the bubble flow direction 27 on the inner surface 24 of the suction mouse 21 is appropriately selected.

  Next, the operation of the defoamer according to the third embodiment of the present invention will be described in detail.

  As the defoaming blade unit according to this embodiment rotates, the foam that touches the suction mouse 21 that rotates turns flows from the narrow-mouth side opening 22 side to the wide-mouth side opening 23 side by the centrifugal effect as in the first embodiment. . Further, the guide vane 32 arranged so that the flow of the bubbles is directed toward the wide-mouth side opening 23 when the suction mouse 21 is rotated also captures and sends the bubbles. By combining these effects, the efficiency of sucking bubbles by the sucking mouse 21 is increased. As a result, the flow rate of bubbles supplied from the suction mouse 21 to the inlet 7 is increased, and the efficiency of bubble breaking by the main defoaming blade 20 is increased. This effect becomes more prominent as the bubble stacking level approaches the L1 side from L3.

  In this embodiment, when the suction mouse 21 sucks bubbles, shear bubble breakage by the guide vanes 32 occurs. By generating shear bubble breakage, the suction force of the suction mouse 21 is further increased.

  The defoaming machine and the defoaming method according to the present embodiment have been described above.

  In the present embodiment, the efficiency of sucking bubbles by the suction mouse 21 is increased by further increasing the suction force of the bubbles of the suction mouse 21, and the main defoaming blade 20 has an effect of causing effective compression bubble breakage.

  Moreover, in this embodiment, it has the effect that the effective shear bubble breakage in the suction mouse | mouth 21 arises.

(Fourth embodiment)
Hereinafter, a defoaming machine and a defoaming method according to a fourth embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, the structure of the defoamer by the 4th Embodiment of this invention is demonstrated in detail.

  FIG. 13 is a projected view showing an example of the structure of the defoaming blade of the defoaming machine according to the fourth embodiment of the present invention, FIG. 13A is a bottom view thereof, and FIG. 13B is a DD ′ line of FIG. 13A. FIG. Referring to FIG. 13A, the defoaming blade according to the present embodiment is provided with a blade 33 on the outer surface 25 of the suction mouse 21. The blades 33 extend in a straight line between the vicinity of the narrow mouth side opening 22 and the vicinity of the wide mouth side opening 23. Referring to FIG. 13B, the blade 33 is provided so as to protrude from the outer surface 25 along the outer surface 25 of the suction mouse 21. The blade 33 is configured so as to give more shearing force to bubbles flowing on the outer surface 25 of the suction mouse 21 when the suction mouse 21 rotates. Further, the blade 33 is configured to further rotate in the centrifugal direction than the outer surface 25 of the suction mouse 21 when the suction mouse 21 rotates.

  FIG. 13A shows an example in which four blades 33 are provided in the radial direction when viewed from the narrow opening 22. However, the shape of the blade 33 may be a curved shape, a screw shape, or the like. The shape of the blade 33 flowing through the outer surface 25 of the suction mouse 21 or applying a shearing force to the bubble and accelerating by capturing the bubble is determined. It is selected appropriately.

  Next, the operation of the defoamer according to the fourth embodiment of the present invention will be described in detail.

  As the defoaming blade unit according to this embodiment rotates, the foam that touches the suction mouse 21 that rotates turns flows from the narrow-mouth side opening 22 side to the wide-mouth side opening 23 side by the centrifugal effect as in the first embodiment. . In the process of flowing, the bubbles are subjected to shearing force by hitting the blades 33 protruding from the outer surface 25 and broken. Further, the foam receives a stronger centrifugal force by flowing through the region of the blade 33 protruding from the outer surface 25, and is strongly blown away in the centrifugal direction of the liquid (bubble) scattering direction 29 shown in FIG. The spray impact of the liquid sprayed in the centrifugal direction collides with the bubbles on the bubble surface 12 shown in FIG. 3 and breaks them.

  The defoaming machine and the defoaming method according to the present embodiment have been described above.

  In this embodiment, it has the effect that the action | operation of a compression bubble breaks up more by further increasing the shear force with respect to the foam which flows through the outer surface 25 of the suction mouth 21. FIG.

  Moreover, in this embodiment, the centrifugal force with respect to the foam which flows through the outer surface 25 of the suction mouse | mouth 21 increases further, and it has the effect that the effect | action of the bubble breakage by a spray impact becomes stronger.

(Fifth embodiment)
Hereinafter, a defoaming machine and a defoaming method according to a fifth embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  First, the structure of the defoamer by the 5th Embodiment of this invention is demonstrated in detail.

  FIG. 14: is a longitudinal cross-sectional view which shows an example of the structure of the defoamer in the 5th Embodiment of this invention. Referring to FIG. 14, the defoamer according to the present embodiment includes a foam level meter 34 and a control device 36 in addition to the first embodiment shown in FIG. 3. The bubble level meter 34 has a bubble detector 35. The bubble level meter 34 is installed so that the bubble detector 35 is positioned near the bubble surface 12. The control device 36 is connected to the driving machine 4 a and the bubble level meter 34. The control device 36 is configured to be able to control the operation of the drive unit 4 a based on the detection result of the bubble level by the bubble level meter 34. A control device 36 exemplified by a computer has a recording medium (not shown), and a program for performing the above-described control is stored in the recording medium.

  The drive unit 4a is configured to be able to control start and stop at a minimum, and preferably, the rotational speed N can be controlled by a variable speed configuration having a speed change mechanism such as an inverter. Moreover, it is good also as a structure which can detect the power load of the drive machine 4a and can control the rotation speed N. FIG. Preferably, the rotation speed N of the main defoaming blade 20 is about 800 to 1200 rpm for efficient defoaming. Moreover, it is good also as a form by which the up-down direction of the drive machine 4a or the unit of a defoaming blade itself is controlled so that the suction mouse | mouth 21 may be used for the foam surface 12 based on the detection result of the foam surface level by the foam surface level meter 34. .

  Next, the operation of the defoamer according to the fifth embodiment of the present invention will be described in detail.

  According to the theory of the centrifugal pump, the head by the rotation of the suction mouse 21 is proportional to the square of the rotational speed N, and the flow rate is proportional to the rotational speed N. Therefore, as the rotation speed N of the suction mouse 21 increases, the lift and flow rate increase, and the amount of foam supplied to the main defoaming blade 20 can be increased. Therefore, the suction of the foam by the suction mouse 21 is effectively performed. Will be broken.

  When this is compared with the foam stacking level shown in FIG. 9, the lift required to suck the foam by the rotation of the suction mouse 21 is maximized at the foam stacking level L1. The head required to suck in the bubbles by the rotation of the sucking mouse 21 becomes lower as it goes from the foam stacking level L1 to the L2 side. However, it is not necessary to reduce the amount of foam supplied to the main defoaming blade 20 between the foam stacking levels L1 and L2. On the L3 side of the foam stacking level L2, the main antifoam blade 20 directly sucks the foam without the suction mouse 21 sucking the foam. However, since the amount of bubbles directly sucked by the main defoaming blade 20 is small under the situation near the foam stacking level L2, the defoaming effect can be enhanced by adding the foam supply from the suction mouse 21. At the foam stacking level L3, the amount of direct inhalation of the main defoaming blade 20 is maximized by the fact that all the inlets 7 (opening area S) of the main defoaming blade 20 are filled with foam. No need to supply foam

  As described above, the optimum amount of foam supplied to the main defoaming blade 20 varies depending on the foam stacking levels L1 to L3. Accordingly, the foam level meter 34 detects the foam stacking level, and the control device 36 controls the rotation speed N of the suction mouse 21 (drive shaft 4a) according to the foam stacking levels L1 to L3 by the program. By doing so, the flow rate of the foam supplied from the suction mouse 21 can be optimally controlled. This realizes an energy-saving automatic operation of the defoamer having the most effective and efficient defoaming effect.

  Moreover, the bubble generation speed can be calculated by measuring the amount of change in the stacking level of bubbles per hour. The defoaming corresponding to the bubble generation speed can be optimally controlled by controlling the rotation speed N of the suction mouse 21 (drive shaft 4a) based on the foam stacking level and the amount of change. This realizes an energy-saving automatic operation of the defoamer that defoams at an optimum speed corresponding to the foam generation speed.

  The suction of the bubbles by the suction mouse 21 and the scattering of the liquid (bubbles) in the centrifugal direction are not large in work amount, and since the load on the power of the drive unit 4a is light, the rotational speed N by the drive unit 4a does not increase the energy consumption. Can be high.

  On the other hand, the load required for the compression bubble breakage in the main defoaming blade 21 filled with foam and the injection of the liquid (foam) from the discharge port 8 is heavy. However, since the defoaming effect is high, it is not necessary to increase the rotational speed N by the drive unit 4a so much.

  Therefore, also from the viewpoint of the load on the power of the drive unit 4a, the rotation speed N is high when bubbles are sucked by the suction mouse 21, and low when bubbles are broken at the main defoaming blade 21. It is efficient to control the rotational speed N.

  Therefore, in this embodiment, it is good also as a form which detects the motive power load of the drive machine 4a and controls the rotation speed N corresponding to it. That is, in the situation where the suction mouse 21 mainly sucks bubbles and the load is light, the rotation speed N is increased to increase the effect of sucking bubbles, and the rotation speed N is increased as the load becomes heavier. By making it low, an energy-saving automatic operation having a high defoaming effect is realized.

  In this embodiment, since it is the structure which has the suction mouse | mouth 21, control of the defoaming speed | rate based on the lamination | stacking level of foam and its variation | change_quantity is effective. For example, when the foam stacking level changes from the L1 side to the L2 side, before the foam stacking level reaches L2, the sucking mouse 21 sucks up the foam and breaks the foam with the main defoaming blade 20. Since defoaming is performed at a light load stage with respect to the power of 4a, the operation efficiency is good. That is, in the defoamer according to the present embodiment, the concentration of the defoaming process can be dispersed.

  In addition, this embodiment is not limited to wastewater treatment facilities including human waste, sewage, etc. used in the activated sludge method. It can be applied regardless of the stacking condition.

  The defoaming machine and the defoaming method according to the present embodiment have been described above.

  In this embodiment, it has the effect that the energy-saving automatic driving | operation is performed so that the defoaming effect by the unit of the defoaming blade by the main defoaming blade 20 and the suction mouse 21 is exhibited to the maximum extent.

  Moreover, in this embodiment, it has the effect that the energy-saving automatic operation that the defoaming speed corresponding to the bubble generation speed is obtained is performed.

  15A to 15D are projection views showing modifications of the structure of the suction mouse of the defoamer according to the embodiment of the present invention. The suction mouse 21 of each of the embodiments described above was a hollow cylinder, the cross-sectional shape was a circle, and the shape of the suction mouse 21 viewed from the side was a straight line. FIG. 15A shows a shape in which the shape of the suction mouse 21 viewed from the side is convex in the direction approaching the wide-mouth side opening 23, that is, in the direction approaching the main defoaming blade 20. FIG. 15B shows a shape in which the suction mouse 21 viewed from the side is convex in a direction away from the wide-mouth side opening 23, that is, in a direction away from the main defoaming blade 20. FIG. 15C has a rectangular cross-sectional shape. In FIG. 15D, although the cross-sectional shape is a circle, an area where the cross-sectional area near the wide-mouth side opening 23 becomes constant after the cross-sectional area gradually widens from the narrow-mouth side opening 22 toward the wide-mouth side opening 23 is provided. It is a form. Thus, the shape of the suction mouth 21 of the defoamer according to the embodiment of the present invention is not limited as long as it satisfies the condition that the cross-sectional area widens from the narrow opening 22 toward the wide opening 23. . Furthermore, the suction mouth 21 of the defoamer according to the embodiment of the present invention may have a different cross-sectional shape between the narrow mouth side opening 22 and the wide mouth side opening 23. Theoretically, the form shown in FIG. 15B is preferable because it efficiently sucks bubbles.

  In addition, an example in which two main antifoaming blades 20 of the above-described embodiments are provided point-symmetrically with respect to the rotation shaft 4 is shown. However, as long as the foam can be effectively removed, the installation form and the number of the main foam removal blades 20 can be changed as appropriate.

  The defoaming machine and the defoaming method according to the embodiment of the present invention have been described above.

  According to the embodiment of the present invention, the defoaming function is exerted by expanding the range without being limited to the bubbles existing in the main defoaming blade region. Moreover, according to the embodiment of the present invention, even if the amount of foam is less than the design, the defoaming is performed effectively. And according to embodiment of this invention, while extending the range which a defoaming function acts, a defoaming effect is raised notably.

  According to the embodiment described above, it is possible to provide a defoaming machine and a defoaming method that can effectively defoam regardless of the properties of the foam and the state of lamination.

In addition, you may implement combining each embodiment suitably, In that case, the combined effect is acquired. In particular, for the first embodiment, it is possible to combine all of the second, third, and fourth embodiments, and a higher effect can be obtained by combining them. Furthermore, the first, second, third, and fourth embodiments can all be combined with the fifth embodiment, and a higher effect can be obtained by combining them.

  The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Plate-shaped body 2 Plate-shaped body 3 Partition plate 3a Virtual surface of a partition plate 4 Rotating shaft 4a Driver 4X Axis centerline 7 Inflow port 7a Virtual surface where the inflow port is formed 8 Discharge port 9 Bubble channel 10 Water tank DESCRIPTION OF SYMBOLS 11 Liquid surface 12 Foam surface 13 Liquid (foam) injection direction 14 Foam inflow direction 20 Main defoaming blade 21 Suction mouse 22 Narrow mouth side opening (suction port)
23 Wide mouth side opening (outlet)
24 Inner surface of the sucking mouse 21 25 Outer surface of the sucking mouse 21 26 Inner region of the sucking mouse 21 27 Flow direction of bubbles on the inner surface 24 of the sucking mouse 21 28 Flow direction of bubbles on the outer surface 25 of the sucking mouse 21 29 Spattering of liquid (bubbles) Direction 30 Foam 31 Dividing plate 32 Guide vane 33 Blade 34 Foam surface level meter 35 Foam detector 36 Controller A Rotation direction of main defoaming vane 20 and suction mouse 21 B Dimension in centrifugal direction at inlet 7 Bd outlet 8 Dimension in the centrifugal direction D Diameter of the inlet 7 d1 Diameter of the wide opening 23 d2 Diameter of the narrow opening 22 def1 Foam shear bubble def2 Foam compression bubble def3 Bubble impact bubble G Centrifugal force Gc Centrifugal force H in the axial direction at the inlet 7 Hd in the axial direction at the outlet 8 L1, L2, L3 Foam stacking level La, Lb, Lc Distance between foam stacking levels m Coefficient by division on the inlet 7 side N Number of rotations n Coefficient by division on the outlet 8 side P Centrifugal of the inlet 7 in contact with the plate-like body 2 Points P1 to 5 (positions on the outermost peripheral portion) Positions in the suction mouse 21 P7 Outermost peripheral portion of the inlet 7 P8 Outermost peripheral portion of the outlet 8 r Distance (radius) from the center of the rotating shaft 4
r7 Distance from the center of the rotary shaft 4 to the outermost peripheral portion P7 of the inlet 7 r8 Distance from the center of the rotary shaft 4 to the outermost peripheral portion P8 of the outlet 8 S Open area of the main defoaming blade 20 α Plate on the inlet 7 side Angle formed between the body 1 or 2 and the partition plate 3 Angle formed between the suction mouse 21 and the centrifugal direction

Claims (21)

A rotation drive mechanism;
A main antifoaming blade having a hollow structure attached to a rotation shaft of the rotation drive mechanism;
A narrow mouth side opening for sucking bubbles and a wide mouth side opening for supplying the foam to the main defoaming blade, and a peripheral edge of the wide mouth side opening is connected to the main defoaming blade; A suction mouse whose cross-sectional area decreases in the direction away from the
The main defoaming blade is
An inflow port into which the bubbles are introduced into the hollow structure at the beginning of the traveling direction during rotation, and the bubbles are discharged from the hollow structure in an area narrower than the inflow port and closer to the centrifugal direction behind the traveling direction. A defoamer having a discharge port. The defoamer according to claim 1,
The connection part of the suction mouse with the main defoaming blade is:
An antifoamer located within a range including the inlet in the centrifugal direction from the rotating shaft. The defoamer according to claim 1 or 2,
In addition, including guide vanes,
The guide vane is
An anti-foaming device provided on an inner surface, which is a surface close to the rotation axis of the suction mouse, so that the flow of the bubbles is directed toward the inlet when the suction mouse rotates. The defoamer according to any one of claims 1 to 3,
In addition, including feathers,
The blade is
A defoamer provided on an outer surface of the suction mouse, which is a surface far from the rotation axis. It is an antifoamer of any one of Claims 1 thru | or 4, Comprising:
The sucking mouse
A defoamer in which a cross section when cut by a plane parallel to the rotation axis and passing through the rotation axis has a convex shape in a direction away from the main defoaming blade. The defoamer according to any one of claims 1 to 5,
The centroid of the outlet is
A defoamer provided so as to be closer to the suction mouse than the centroid of the inlet. The defoamer according to any one of claims 1 to 6,
The outermost peripheral portion of the discharge port has a distance from the center of the rotating shaft in the centrifugal direction more than the outermost peripheral portion of the inlet, and the inlet, the outermost peripheral portion of the inlet, and the The defoamer having an angle of 90 degrees or less with a line connecting the outermost peripheral portion of the discharge port. The defoamer according to any one of claims 1 to 7,
In addition, including a dividing plate,
The dividing plate is
In any of a plurality of flow paths from the inlet to the outlet formed by dividing the inside of the main defoaming blade in a direction substantially perpendicular to the rotation axis, the outlet having a smaller area than the inlet. A defoaming machine for the exit. The defoamer according to any one of claims 1 to 8,
In addition, including a bubble level meter,
A defoamer configured to change the number of rotations of the rotation drive mechanism according to the bubble level measured by the bubble level meter. The defoamer according to claim 9, wherein
The number of rotations is increased in the order of the bubble level where the inlet is completely covered, the bubble level where the inlet is partially covered, and the bubble level where the inlet is not completely covered. A defoamer that is configured to speed. It is an antifoamer of any one of Claims 1 thru | or 10, Comprising:
The peripheral edge of the inlet is
Defoamer with a sharp edge shape. A rotation driving mechanism driving a rotating shaft to which a main antifoaming blade having a hollow structure is attached;
A suction mouth having a narrow mouth side opening and a wide mouth side opening, wherein a peripheral edge of the wide mouth side opening is connected to the main defoaming blade and a cross-sectional area becomes narrower in a direction away from the main defoaming blade, And sucking the foam from the narrow-side opening,
The suction mouse supplies the foam from the wide-mouth side opening to the leading inlet of the traveling direction when the main defoaming blade rotates.
The main defoaming blade flows the supplied foam from the inlet into the hollow structure;
The main defoaming blade guides the foam to an outlet from which the foam is discharged from within the hollow structure in a narrower area than the inflow port and closer to the centrifugal direction on the rear side in the traveling direction;
A step of discharging the bubbles from the outlet provided in a centroid such that the main defoaming blade is closer to the suction mouse than the centroid of the inflow port. A defoaming method according to claim 12,
The suction mouse supplying the foam to the inlet;
A defoaming method performed at a position within a range including the inflow port in the centrifugal direction from the rotation axis. The defoaming method according to claim 12 or 13,
The suction mouse supplying the foam to the inlet;
Supplying the bubbles by guide vanes provided on the inner surface, which is the surface close to the rotation axis, of the suction mouse so that the flow of the bubbles is directed toward the inlet when the suction mouse rotates. Including defoaming method. The defoaming method according to any one of claims 12 to 14,
The suction mouse supplying the foam to the inlet;
A defoaming method comprising the step of shearing the foam with a blade provided on an outer surface which is a surface far from the rotation axis of the suction mouse. The defoaming method according to any one of claims 12 to 15,
The main defoaming blade guides the foam to the outlet,
In any of the plurality of flow paths from the inlet to the outlet formed by a dividing plate that divides the inside of the main defoaming blade in a direction substantially perpendicular to the rotation axis, the area is narrower than the inlet. A method of defoaming, comprising the step of guiding the foam to a discharge port. The defoaming method according to any one of claims 12 to 16,
Furthermore, the defoaming method includes the step of changing the number of rotations of the rotation drive mechanism according to the bubble level measured by the bubble level meter. A defoaming method according to claim 17,
Further, the number of rotations in the order of the bubble level at which the inflow port is entirely covered, the bubble level at which the inflow port is partially covered, and the bubble level at which the inflow port is not completely covered. An antifoaming method comprising the step of controlling to increase the speed. A defoaming method according to any one of claims 12 to 18,
The main defoaming blade flows the foam from the inlet into the hollow structure,
A defoaming method comprising the step of shearing the foam at a peripheral edge of the inlet having a sharp edge shape.   A program for causing a computer to execute the method according to claim 17 or 18.   A recording medium for storing the program according to claim 20.

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