JP2018012054A - Defoaming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defoaming device capable of gathering foam in a wide range and efficiently annihilating it.SOLUTION: A defoaming device 2 has an exhaust port 20 that exhausts with air a liquid resulting from foam annihilation via collision of foam B with an inner wall part 6A of a casing 6. The exhaust port 20 is disposed so as to be open on a liquid level T of a liquid tank 1 in order to blow air obliquely from radially outside a suction port 18 of a cylindrical part 17 toward the foam B produced on the liquid level T of the liquid tank 1. This enables air exhausted from the exhaust port 20 to gather the foam B produced on the liquid level T into the suction port 18 of the cylindrical part 17, so that foam B in a wide range can be gathered and efficiently annihilated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an antifoaming device that destroys and extinguishes bubbles by sucking bubbles, and more particularly to an antifoaming device that can satisfactorily erase bubbles generated on the liquid surface of a liquid stored in a liquid tank.

  In the conventional defoaming device, bubbles generated on the liquid surface of the liquid tank are sucked from the suction port by the rotation of the impeller and guided to the inlet, and the bubbles are transferred to the outer peripheral side of the impeller by centrifugal force. It collides with the inner wall of the casing on the outer peripheral side of the impeller, and is destroyed and disappeared. And the liquid which arises by destruction and extinction of foam is discharged | emitted from a discharge port with air, and is returned in a liquid tank (for example, refer patent document 1).

Japanese Patent No. 3604873

  However, in the defoaming device disclosed in Patent Document 1, it has been difficult to efficiently eliminate a wide range of bubbles.

  An object of the present invention is to provide a defoaming device capable of collecting a wide range of bubbles and efficiently annihilating them.

In order to achieve this problem, the present invention has taken the following measures. That is,
A casing containing the impeller inside, an inlet opening toward the center of the impeller on the front side facing the impeller of the casing, and a suction port for sucking bubbles generated on the liquid level of the liquid tank A cylindrical portion having a suction passage that leads to the inside of the casing through the inlet, and an impeller outer periphery that collides so as to destroy the foam that has been moved from the inlet to the outer peripheral side of the impeller by receiving centrifugal force due to the centrifugal action of the impeller An inner wall portion of the casing, a discharge port that discharges the liquid resulting from the disappearance of the foam together with air by the collision of the bubbles to the inner wall portion of the casing, and an electric motor that rotates the impeller from the back of the casing, An eraser characterized in that it is arranged on the liquid surface of the liquid tank so as to incline toward the bubbles formed on the liquid surface of the liquid tank from the outside in the radial direction of the suction port of the cylindrical portion so as to blow air. That is the foam device.

In this case, the discharge port may be formed in an annular shape by opening at the front end of a discharge flow path in which liquid caused by bubble disappearance flows along with air due to the collision of bubbles with the inner wall portion of the casing. Moreover, the said discharge port may arrange | position the position of the orthogonal | vertical direction substantially with the suction port of the said cylinder part.

  As described above in detail, in the invention described in claim 1, the discharge port for discharging the liquid caused by the disappearance of the bubbles together with the air by the collision of the bubbles to the inner wall portion of the casing is from the outside in the radial direction of the suction port of the cylindrical portion. An opening was placed on the liquid level of the liquid tank so as to blow air in a direction inclined toward the bubbles generated on the liquid level of the liquid tank. For this reason, since the air blown from the discharge port allows bubbles generated on the liquid surface to be gathered to the suction port of the cylindrical portion, a wide range of bubbles can be gathered together and efficiently eliminated.

  Further, in the invention described in claim 2, the discharge port is formed in an annular shape by opening at the tip of the discharge flow path in which the liquid caused by the disappearance of the foam together with the air is collided with the inner wall portion of the casing. For this reason, since air is blown from the outer circumference in the radial direction of the suction port of the cylinder part, bubbles generated on the liquid surface can be further gathered to the suction port of the cylinder part, and the bubbles disappear more efficiently. be able to.

  In the invention according to claim 3, the discharge port is arranged substantially at the same position in the vertical direction as the suction port of the cylindrical portion. For this reason, the discharge port can be opened in the vicinity of the liquid level of the liquid tank together with the suction port of the cylinder part, and air can be blown toward the bubbles generated on the liquid level and the bubbles from the suction port of the cylinder part can be opened. Suction can be made even better, and bubbles can be eliminated more efficiently.

It is a longitudinal cross-sectional view of the defoaming apparatus which showed one Embodiment of this invention. It is sectional drawing along line AA of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a liquid tank that collects and stores a liquid such as a coolant liquid, and is provided with an inflow pipe through which a coolant liquid (not shown) flows and an outflow pipe through which the coolant liquid flows out. Reference numeral 2 denotes a defoaming device, on which a mounting plate 4 is mounted on an upper plate 3 of the liquid tank 1. In the defoaming device 2, a casing 6 is attached to the lower portion of the mounting plate 4 via a plurality of bosses 5 by welding. The casing 6 has a substantially cylindrical shape in which the upper part is closed and the lower part is opened, and an impeller 7 is accommodated therein. The impeller 7 has six blade pieces 7B attached to the front side of the circular disk 7A so as to extend in the radial direction, and an input shaft 7C attached to the center in the radial direction. The outer periphery of the impeller 7, that is, the radially outer end of each blade piece 7B is disposed opposite to the inner wall portion 6A of the casing 6. The input shaft 7 </ b> C passes through the casing 6 and the mounting plate 4 and protrudes behind it, and is coaxially attached to the output shaft 8 </ b> A of the electric motor 8. The electric motor 8 is detachably attached by a plurality of bolt members 10 to an attachment plate 9 attached to the upper portion of the mounting plate 4 by welding.

  A disc-shaped substrate 12 is attached to a lower portion of the casing 6 with a plurality of bolt members 13 with a plurality of collar members 11 having gaps. As shown in FIG. 2, the substrate 12 has four arc-shaped openings 14A, 14B, 14C, and 14D formed through the center. A substantially cylindrical inlet cylindrical portion 15 is attached to the upper surface of the substrate 12 by welding, and the inlet cylindrical portion 15 is directed to the upper end of the casing 12 on the front side facing the impeller 7 of the casing 6 toward the center of the impeller 7. An inlet 16 is formed. A substantially cylindrical tube portion 17 is attached to the lower surface of the substrate 12 by welding, and the tube portion 17 has a suction port 18 for sucking bubbles B generated on the liquid surface T of the liquid tank 1 at its lower end. The cylindrical portion 17 has a suction passage 19 that communicates with the inside of the casing 6 via the inlet 16 through the openings 14 to 14D.

  Reference numeral 20 denotes a discharge port for discharging the liquid caused by the disappearance of the bubbles together with the air when the bubbles collide with the inner wall 6 </ b> A of the casing 6. The discharge port 20 opens near the liquid surface T of the liquid tank 1 and is perpendicular to the suction port 18 of the cylindrical portion 17. The direction positions are made substantially equal, and the air is blown from the outside of the suction port 18 of the cylindrical portion 17 toward the bubbles B generated on the liquid surface T of the liquid tank 1 from the outside in the radial direction. In detail, the radially outer end of the casing 6 extends in the horizontal direction outward, bends downward in the vertical direction, and further bends inwardly in the radial direction to be discharged. The outer member 21 is formed. Further, the radially outer end of the substrate 12 extends in the horizontal direction outwardly, and is bent downward in the vertical direction from there, and is further bent inwardly in the radial direction to be bent and formed in the discharge inner member 22. Is forming. A gap between the discharge outer member 21 and the discharge inner member 22 is a discharge flow path 23. The discharge flow path 23 causes liquid caused by bubble disappearance to flow along with air when the bubbles collide with the inner wall portion 6 </ b> A of the casing 6, and the discharge port 20 is opened at the tip. The discharge port 20 is formed in an annular shape.

Next, the operation of this configuration will be described.
When the impeller 7 is rotationally driven by the electric motor 8, air is sucked from the suction port 18 through the openings 14 </ b> A to 14 </ b> D and the inlet 16 by the centrifugal action of the impeller 7, and is discharged from the discharge port 20. The bubbles B generated on the liquid surface T are sucked from the suction port 18 when reaching the vicinity of the suction port 18. The sucked bubble B is guided from the cylindrical portion 17 through the openings 14A to 14D and the inlet 16 into the casing 6 and collides with the impeller 7. Due to this collision, a part of the bubbles B is destroyed and disappears, and the coolant liquid droplets generated thereby, together with the remaining bubbles B, are subjected to centrifugal force by the impeller 7 and receive the centrifugal force toward the outer peripheral side of the impeller 7. And collide with the inner wall portion 6 </ b> A of the casing 6. In this collision, substantially all of the remaining bubbles B are destroyed and disappear.

  The coolant liquid droplets generated by the disappearance of the bubbles B flow along with the air through the discharge channel 23, are discharged from the discharge port 20, and are returned to the liquid tank 1. In this way, the bubbles B on the liquid surface T are sucked, destroyed, and disappeared, so that the accumulation of bubbles B can be suppressed.

  With this operation, the discharge port 20 that discharges the liquid resulting from the disappearance of the bubbles together with the air by the collision of the bubbles B to the inner wall portion 6 of the casing 6A is the liquid level of the liquid tank 1 from the outside in the radial direction of the suction port 18 of the cylindrical portion 17. The liquid tank 1 was opened on the liquid surface T so as to be inclined toward the bubbles B generated on the air T and blown air. For this reason, the bubbles B generated on the liquid surface T can be gathered and collected at the suction port 18 of the cylindrical portion 17 by the air blown from the discharge port 20, so that a wide range of bubbles B can be gathered together and efficiently disappeared. Can do.

  Further, the discharge port 20 is formed in an annular shape by opening at the tip of the discharge flow path 23 through which the liquid caused by the disappearance of the bubbles along with the collision of the bubbles B with the inner wall portion 6A of the casing 6 flows. For this reason, since air is blown from the outer circumference in the radial direction of the suction port 18 of the cylindrical part 17, the bubbles B generated on the liquid surface 1 can be further gathered to the suction port 18 of the cylindrical part 17, B can be eliminated more efficiently.

  In addition, the discharge port 20 is arranged at substantially the same position in the vertical direction as the suction port 18 of the cylindrical portion 17. For this reason, the discharge port 20 can be opened in the vicinity of the liquid level T of the liquid tank 1 together with the suction port 18 of the cylindrical part 17, and the air blowing and the cylindrical part toward the bubbles B generated on the liquid level T The suction of the bubbles B from the 17 suction ports 18 can be made even better, and the bubbles B can be more efficiently extinguished.

  In one embodiment, the discharge outer member 21 and the discharge inner member 22 forming the discharge flow path 23 having the discharge port 20 at the tip are formed integrally by extending the casing 6 and the substrate 12, respectively. Of course, the discharge outer member 21 and the discharge inner member 22 may be formed separately from the casing 6 and the substrate 12 and attached detachably.

1: Liquid tank 6: Casing 6A: Inner wall portion 7: Impeller 8: Electric motor 16: Inlet 17: Tube portion 18: Suction port 20: Discharge port T: Liquid surface B: Bubble

In order to achieve this problem, the present invention has taken the following measures. That is,
A casing containing the impeller inside, an inlet opening toward the center of the impeller on the front side facing the impeller of the casing, a suction port for sucking bubbles generated on the liquid level of the liquid tank, and suction Yes to the impeller outer circumference of collision so that the suction passage channel communicating with the casing through the inlet from the mouth, bubbles migrated to the outer peripheral side of the impeller the inlet receives a centrifugal force due to the centrifugal action of the impeller is destroyed and an inner wall portion of the casing has, provided with a discharge port for discharging a liquid by bubbles disappear together with the air collision of bubbles to the inner wall portion of the casing, an electric motor for rotating the impeller from behind the casing, outlet, intake An antifoaming device, wherein the defoaming device is arranged to open on the liquid surface of the liquid tank so as to incline toward the bubbles generated on the liquid surface of the liquid tank from the outside in the radial direction of the suction port so as to blow air. That is it.

In this case, the discharge port may be formed in an annular shape by opening at the front end of a discharge flow path in which liquid caused by bubble disappearance flows along with air due to the collision of bubbles with the inner wall portion of the casing. Furthermore, the outlet may be disposed in front Ki吸引口the vertical position substantially equally.

As described in detail above, the invention according to claim 1, outlet liquid by bubble extinction in the collision of bubbles to the inner wall portion of the casing to discharge together with the air, the liquid tank from radially outward of the intake引口An opening was placed on the liquid surface of the liquid tank so as to incline toward the bubbles generated on the liquid surface and blow air. Therefore, the air blown from the outlet, because the bubbles generated on the liquid surface can be put together in intake引口can be eliminated efficiently gathered extensive foam.

Further, in the invention described in claim 2, the discharge port is formed in an annular shape by opening at the tip of the discharge flow path in which the liquid caused by the disappearance of the foam together with the air is collided with the inner wall portion of the casing. Therefore, because blowing of air from the entire circumference radially outward of the intake引口, bubbles occur on the liquid surface can further be put together in intake引口can be extinguished more efficiently foam.

The invention according to claim 3, the outlet was positioned approximately equally the position of the intake引口perpendicular direction. Thus, the outlet can be opened in the vicinity of the liquid surface of the liquid tank together with intake引口, a suction foam from the air and intake引口air towards bubbles occur on the liquid surface and more It can be made better, and the bubbles can be eliminated more efficiently.

Claims (3)

  A casing containing the impeller inside, an inlet opening toward the center of the impeller on the front side facing the impeller of the casing, and a suction port for sucking bubbles generated on the liquid level of the liquid tank A cylindrical portion having a suction passage that leads to the inside of the casing through the inlet, and an impeller outer periphery that collides so as to destroy the foam that has been moved from the inlet to the outer peripheral side of the impeller by receiving centrifugal force due to the centrifugal action of the impeller An inner wall portion of the casing, a discharge port that discharges the liquid resulting from the disappearance of the foam together with air by the collision of the bubbles to the inner wall portion of the casing, and an electric motor that rotates the impeller from the back of the casing, An eraser characterized in that it is arranged on the liquid surface of the liquid tank so as to incline toward the bubbles formed on the liquid surface of the liquid tank from the outside in the radial direction of the suction port of the cylindrical portion so as to blow air. Foam equipment.   2. The discharge port according to claim 1, wherein the discharge port is formed in an annular shape by opening at a distal end of a discharge flow channel that causes liquid caused by bubble disappearance to flow together with air when the bubble collides with an inner wall portion of the casing. Defoaming device. The defoaming device according to claim 2, wherein the discharge port is disposed substantially at the same position in the vertical direction as the suction port of the cylindrical portion.

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