Defoamer

Abstract

To provide a defoaming machine that can efficiently eliminate foam. [Solution] The defoaming machine 100 eliminates foam generated on the liquid surface by the rotation of a defoaming blade 1. The defoaming blade 1 is provided with a foam flow path having an inlet 3 into which foam flows in by rotation and an outlet 4 into which the defoamed liquid is discharged. There is a portion between the inlet 3 and the outlet 4 in which the cross-sectional area of ​​the flow path is reduced, and the inlet 3 and the outlet 4 are opposite each other in the tangential direction of rotation.

Description

Technical Field

[0001] The present invention relates to an antifoaming machine for eliminating bubbles on the liquid surface generated in biological treatment of wastewater or chemical reactions.

Background Art

[0002] In the biological treatment of wastewater or chemical reactions, bubbles are generated on the liquid surface. If these bubbles are continuously generated, the bubbles may overflow from the treatment tank of the wastewater.

[0003] As a device for eliminating bubbles generated on the liquid surface, for example, there is one shown in Patent Document 1.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the antifoaming device of Patent Document 1, since the flow path of the bubbles is formed in the centrifugal direction, the liquid discharged from the antifoaming flow path is accelerated by the centrifugal force. Therefore, there is a problem that the discharged liquid reaches the liquid surface vigorously, and bubbles are generated again on the liquid surface. In addition, there is a problem that the liquid discharged in the centrifugal direction moves the bubbles generated on the liquid surface away from the antifoaming device.

[0006] Therefore, an object of the present invention is to provide an antifoaming machine that can eliminate bubbles more efficiently.

Means for Solving the Problems

[0007] The defoaming machine according to claim 1 of the present invention is a defoaming machine that eliminates foam generated on the surface of a liquid by the rotation of a defoaming blade, wherein the defoaming blade is provided with a foam flow path having an inlet into which foam flows in by rotation and an outlet into which the defoamed liquid is discharged, and there is a portion between the inlet and the outlet in which the cross-sectional area of ​​the flow path is reduced, and the inlet and the outlet are opposite each other in the tangential direction of rotation.

[0008] According to the defoamer of claim 1, the inlet and outlet are opposite each other in the tangential direction of rotation, so that the defoamed liquid is not accelerated and discharged by centrifugal force. Therefore, the defoamed liquid is not forcefully discharged from the defoamer toward the liquid surface where foam is generated, thereby preventing foam from being generated again on the liquid surface and preventing the foam from being pushed away from the defoamer.

[0009] The defoaming machine according to claim 2 of the present invention is the defoaming machine according to claim 1, wherein the discharge section of the foam flow path is spaced higher above the water surface than the inlet section.

[0010] According to the defoamer of claim 2, in addition to the same operation as the defoamer of claim 1, the inflow of foam from the inflow section is ensured, and the discharge section of the foam flow path is spaced higher above the water surface than the inflow section, so that the defoamed liquid can crush the foam generated on the liquid surface from above.

[0011] The defoaming machine according to claim 3 of the present invention is the defoaming machine according to claim 1 or 2, wherein the discharge section is provided with a guide piece for causing the defoamed liquid to fall downward.

[0012] The defoaming machine according to claim 3 of the present invention causes the defoamed liquid to fall downward from the discharge section of the defoaming machine according to claim 1 or 2, thereby crushing the bubbles that have formed on the liquid surface near the defoaming machine from above. When the bubbles that have formed on the liquid surface near the defoaming machine disappear, the surrounding bubbles move to gather towards the rotation center of the defoaming machine. In this way, the bubbles that gather can be continuously eliminated by the defoaming machine. [Effects of the Invention]

[0013] According to the defoaming machine of the present invention, the foam generated on the liquid surface can be eliminated more efficiently.

Brief Description of the Drawings

[0014] [Figure 1] It is a schematic front view of the defoaming machine of an embodiment of the present invention. [Figure 2] It is a plan view of the defoaming blade of the defoaming machine in FIG. 1. [Figure 3] It is a front view of the defoaming blade of the defoaming machine in FIG. 1. [Figure 4] It is a side view of the flow path seen from the inflow part side.

Embodiments for Carrying out the Invention

[0015] The defoaming machine 100 of an embodiment of the present invention will be described with reference to the drawings.

[0016] The defoaming machine 100 has an electric motor 200 having a rotating shaft and a defoaming blade 1 fixed to the rotating shaft.

[0017] The defoaming machine 100 is supported by a hanging member 300 so as to be able to approach and separate from the water surface.

[0018] As shown in FIG. 2, the defoaming blade 1 has two flow paths 2A and 2B.

[0019] The two flow paths 2A and 2B are connected by a connection plate 10. The center of gravity of the connection plate 10 is the rotation center 11.

[0020] The defoaming blade 1 has a point-symmetrical shape with the rotation center 11 as the center of the object in the plan view of FIG. 2.

[0021] The defoaming blade 1 is configured to rotate in the direction of arrow a in FIG. 2 by rotation.

[0022] Each flow path 2A, 2B has an inflow portion 3 into which bubbles flow due to rotation and a discharge portion 4 from which the defoamed liquid is discharged.

[0023] As shown in FIG. 3, the opening of the inflow portion 3 is larger than the opening of the discharge portion 4.

[0024] The inflow portion 3 and the discharge portion 4 are opposed to each other in the tangential direction of rotation.

[0025] Each flow path 2A, 2B has a portion where the cross-sectional area of the flow path is reduced between the inflow portion 3 and the discharge portion 4.

[0026] The configuration of each flow path 2A, 2B will be described in detail.

[0027] Each flow path 2A, 2B has a configuration surrounded by a bottom plate 21, a left side plate 22, a right side plate 23, and a top plate 24.

[0028] As shown in the front view of FIG. 3, the top plate 24 and the bottom plate 21 are opposed to each other in the vertical direction.

[0029] As shown in FIG. 3, the bottom plate 21 has a first surface 21A that is opposed to the top plate 24 in the vertical direction from the inflow portion 3 side toward the discharge portion 4 side, a second surface 21B that is inclined so as to approach the top plate 24, and a third surface 21C that is opposed to the top plate 24 in the vertical direction in a state where the distance from the first surface to the top plate 24 is shorter than that of the first surface.

[0030] The left side plate 22 extends in a direction orthogonal to the radial direction of the rotation center.

[0031] As shown in the plan view of FIG. 2, the right side plate 23 has a fourth surface 23A that is opposed to the left side plate 22 in the radial direction of the rotation center and a fifth surface 23B that is inclined so as to gradually approach the left side plate 22 from the inflow portion 3 side toward the discharge portion 4 side.

[0032] As shown in FIG. 3, the bottom plate 21 on the inflow portion 3 side is positioned below the bottom plate 21 on the discharge portion 4 side.

[0033] With this configuration of a bottom plate 21, left side plate 22, right side plate 23, and top plate 24, the opening area of ​​the discharge section 4 is smaller than the opening area of ​​the inlet section 3.

[0034] Furthermore, even if the opening of the inlet 3 reaches a position close to the water surface, the opening of the discharge 4 is located further above the water surface than the opening of the inlet 3.

[0035] The discharge section 4 is provided with a guide piece 5 for causing the defoamed liquid to fall downwards.

[0036] The dashed line in Figure 1 shows the height of the bubbles generated above the water surface. As the defoaming blade 1 rotates within these bubbles, the bubbles flow from the inlet 3 into the channel 2. As the bubbles pass through the channel 2, they are compressed and turn into liquid. This defoamed liquid is guided by the guide piece 5 from the discharge 4 and falls downward. As the defoamed liquid falls onto the bubbles generated above the liquid surface, the bubbles on the liquid surface are also eliminated.

[0037] The defoamed liquid is guided by the guide piece 5, and the trajectory of its downward fall is donut-shaped near the center of rotation. As a result, defoaming progresses near the center of rotation, and bubbles further away from the center of rotation gather towards the center of rotation. Therefore, bubbles on the entire liquid surface can be efficiently eliminated.

[0038] In the embodiments described above, the case where the defoaming blade has the shape shown in each figure has been explained, but the invention is not limited to this. The shape of the defoaming blade may be changed as appropriate, as long as it is a shape that corresponds to the invention of each claim of this application.

[0039] In the above embodiment, the case in which the defoamer is supported by the hanging member shown in Figure 1 was described, but the invention is not limited to this. The hanging member to which the defoamer is supported can be freely selected as long as it allows the defoamer to move closer to and further away from the water surface. [Explanation of Symbols]

[0040] 1 defoaming feathers 2A flow path 2B flow path 3. Inflow section 4 Discharge section 5. Induction tablets 10 connecting boards 11 Return Center 21 Base Plate 21A Page 1 21B Page 2 21C Page 3 22. Left side panel 23 Right side panel 23A Page 4 23B Page 5 24 board 100 Defoamer 200 electric motor 300 Vertical components

Claims

1. A defoaming machine that eliminates foam generated on the liquid surface by rotating defoaming blades, The defoaming blade is provided with a foam flow path having an inlet where foam flows in as it rotates and an outlet where the defoamed liquid is discharged, and there is a section between the inlet and outlet where the cross-sectional area of ​​the flow path is reduced. A defoaming machine characterized in that the inlet and outlet are opposite each other in the tangential direction of rotation.

2. The defoaming machine according to claim 1, characterized in that the discharge section of the foam channel is located higher above the water surface than the inlet section.

3. The defoaming machine according to claim 1 or 2, characterized in that the discharge section is provided with a guide piece for causing the defoamed liquid to fall downward.

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