JP6855291B2 - Defoamer - Google Patents

Description

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

In the conventional defoaming device, the bubbles generated on the liquid surface of the liquid tank are sucked from the suction port by the rotation of the impeller, and the bubbles are centrifugally transferred to the outer peripheral side of the impeller and transferred to the outer peripheral side of the impeller. It collides with the inner wall of the casing and is destroyed and disappears. Then, the liquid generated by the disappearance of bubbles is discharged from the discharge port together with air and returned into the liquid tank (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2002-219306 (paragraph numbers 0017 to 0019, FIGS. 3, 4)

However, with such a conventional defoaming device, the defoaming ability of bubbles is not yet satisfactory, and the defoaming area of bubbles generated on the liquid surface of the liquid tank is small, so that sufficient defoaming ability can be obtained. , A device using a large impeller and a large electric motor that rotates this large impeller is required, and there is a problem that the device becomes large.

An object of the present invention is to provide a defoaming device capable of improving the suction ability of bubbles and increasing the defoaming area of bubbles generated on the liquid surface of a liquid tank without increasing the size of the device.

In order to achieve such a problem, the present invention has taken the following measures. That is,
An impeller with a plurality of impellers extending in the radial direction from the center, a casing containing the impeller inside, and an entrance and an entrance that open toward the center of the impeller on the front side of the casing facing the impeller. A suction port that is located lower in the vertical direction and sucks bubbles generated on the liquid surface of the liquid tank, a suction flow path that leads from the suction port through the inlet to the inside of the casing, and centrifugal force due to the centrifugal action of the impeller. The liquid tank together with air is filled with air due to the collision of the inner wall of the casing with the inner wall of the casing and the inner wall of the casing that collide with each other so that the bubbles transferred from the inlet to the outer circumference of the impeller are destroyed. It is equipped with a discharge port that discharges inward and an electric motor that rotates and drives the impeller from behind the casing. The inlet and suction port are arranged concentrically with different diameters and are formed concentrically with different opening areas. A large diameter has a large opening area, a small diameter has a small opening area, a plate-shaped member is attached to the casing on the front side of the impeller facing a plurality of blade pieces, and the plate-shaped member has an entrance. It is a defoaming device characterized in that a substantially circular second inlet is formed concentrically with and the second inlet has a diameter equal to or less than the diameter of the inlet.

In this case, before Symbol second inlet may be substantially the same diameter of the inlet and bore.

As described in detail above, the invention according to claim 1 has an inlet that opens toward the center of the impeller on the front side of the casing facing the impeller, and a liquid that is located below the inlet in the vertical direction. The suction port for sucking the bubbles generated on the liquid surface of the tank was formed with a different opening area, the suction port was formed with a large opening area, and the inlet was formed with a small opening area. Therefore, when the bubbles are sucked by the centrifugal action of the impeller, the defoaming area of the bubbles can be increased by the suction port having a large opening area, and the air volume for sucking the bubbles by the inlet having a small opening area can be increased. Since the number can be increased, the suction capacity of bubbles can be improved without increasing the size of the device, and the defoaming area of bubbles generated on the liquid surface of the liquid tank can be increased.

Further, in the invention according to claim 1 , the inlet and the suction port are arranged concentrically with different diameters in a substantially circular shape, the suction port is formed to have a large diameter, and the inlet is formed to have a small diameter. Therefore, the inlet and the suction port are substantially circular and can be easily formed.

Further, in the invention according to claim 1, a plate-shaped member is attached to the casing on the front side of the impeller so as to face a plurality of blade pieces, and the plate-shaped member is provided with a substantially circular second inlet concentric with the inlet. The second inlet was formed so that the diameter of the second inlet was equal to or less than the diameter of the inlet. Therefore, since the gap below the blade piece can be reduced by the plate-shaped member arranged to face the blade piece, it is possible to prevent the foam from falling downward when the foam is transferred to the outer peripheral side of the impeller, and the casing can be used. It collides with the inner wall portion and is satisfactorily destroyed, and the defoaming ability can be improved. Then, since the bubbles passing through the small-diameter inlet from the large-diameter suction port reach the impeller through the second inlet formed in the plate-shaped member, it is possible to suppress the reduction of the air volume for sucking the bubbles.

Further, in the invention according to claim 2 , the diameter of the second entrance is substantially the same as that of the entrance. Therefore, the bubbles passing through the small-diameter inlet from the large-diameter suction port reach the impeller through the second inlet having substantially the same diameter as the inlet, so that the reduction of the air volume for sucking the bubbles can be further suppressed. it can.

It is a vertical sectional view of the defoaming apparatus which showed one Embodiment of this invention. It is a bottom view which showed a part seen from the arrow A of FIG. It is a vertical sectional view of the defoaming apparatus which showed the reference example. It is a figure along the line BB of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIGS. 1 and 2, reference numeral 1 denotes a liquid tank for collecting and storing a liquid such as a coolant liquid. Reference numeral 2 denotes a defoaming device, in which the mounting plate 4 is placed and installed on the upper plate 3 of the liquid tank 1. In the defoaming device 2, the casing 6 is attached to the lower part of the mounting plate 4 by welding via a plurality of bosses 5. The casing 6 has a substantially cylindrical shape with the upper part closed and the lower part open, and the impeller 7 is housed inside. The impeller 7 has six blade pieces 7B attached to the front side of the circular disk 7A so as to extend radially from the center, and an input shaft 7C is attached to the center portion in the radial direction. The outer circumference of the impeller 7, that is, the outer end in the radial direction of each blade piece 7B is arranged to face the inner wall portion 6A of the casing 6. The input shaft 7C penetrates the casing 6 and the mounting plate 4 and projects behind the casing 6, and is coaxially attached to the output shaft 8A of the electric motor 8. The electric motor 8 is detachably attached to a mounting plate 9 attached to the upper portion of the mounting plate 4 by welding with a plurality of bolt members 10.

At the lower part of the casing 6, a disc-shaped substrate 12 having a gap between the plurality of collar members 11 is attached by the plurality of bolt members 13. The substrate 12 is formed to penetrate a substantially circular entrance 14 toward the center of the impeller 7 on the front side of the casing 6 facing the impeller 7. The inlet 14 is formed to have a small diameter with a small opening area. A cylindrical member 15 is attached to the upper surface of the substrate 12 by welding, and a substantially circular plate-shaped member 16 facing the blade piece 7B on the front side of the impeller 7 is attached to the upper end of the cylindrical member 15 by welding. The plate-shaped member 16 is concentric with the inlet 14 and forms a second inlet 17 having substantially the same diameter as the inlet 14. A substantially cylindrical tubular portion 18 is attached to the lower surface of the substrate 12 by welding, and bubbles C generated on the liquid surface T of the liquid tank 1 are sucked to the lower end of the tubular portion 18 to be concentric with the inlet 14 and substantially circular. Has a suction port 19 of. The suction port 19 is formed to have a large opening area and a large diameter. The inlet 14 and the suction port 19 are formed concentrically with different diameters having different opening areas. As an example, the suction port 19 preferably has an opening area of about 2.25 times and a diameter of about 1.5 times that of the inlet 14. The tubular portion 18 has a suction flow path 20 that leads from the suction port 19 to the inside of the casing 6 via the inlet 14 and the second inlet 17.

Reference numeral 21 denotes a discharge port, which is composed of a gap formed by a plurality of collars 11 between the lower portion of the casing 6 and the substrate 12, and the liquid due to the disappearance of bubbles due to the collision of bubbles with the inner wall 6A of the casing 6 is discharged together with air in the liquid tank 1. Discharge to.

Next, the operation of such a configuration will be described.
When the impeller 7 is rotationally driven by the electric motor 8, air is sucked from the suction port 19 into the casing 6 through the suction flow path 20 by the centrifugal action of the impeller 7, and is discharged from the discharge port 21. Then, the bubbles C generated on the liquid surface T are guided into the casing 6 through the suction flow path 20 and collide with the impeller 7. Part of the bubbles C is destroyed and disappears by this collision, and the droplets of the coolant liquid generated by this are subjected to centrifugal force by the centrifugal action of the impeller 7 together with the remaining bubbles C, and the outer periphery of the impeller 7 is received. It is moved to the side and collides with the inner wall portion 6A of the casing 6. In this impact, substantially all of the remaining bubbles C are destroyed and disappear. Then, the droplets of the coolant liquid generated by the disappearance of the bubbles C are discharged from the discharge port 21 together with the air and returned to the liquid tank 1.

By this operation, the inlet 14 which opens toward the center of the impeller 7 on the front side of the casing 6 facing the impeller 7 and the inlet 14 which is located below the inlet 14 in the vertical direction are on the liquid level of the liquid tank 1. The suction port 19 for sucking the generated bubbles C was formed with a different opening area, the suction port 19 was formed with a large opening area, and the inlet 14 was formed with a small opening area. Therefore, when the bubbles C are sucked by the centrifugal action of the impeller 7, the defoaming area of the bubbles can be increased by the suction port 19 having a large opening area, and the bubbles are sucked by the inlet 14 having a small opening area. Since the amount of air to be sucked can be increased, the suction capacity of bubbles can be improved without increasing the size of the device, and the defoaming area of bubbles C generated on the liquid surface T of the liquid tank 1 can be increased.

Further, the inlet 14 and the suction port 19 are arranged concentrically with different diameters in a substantially circular shape, the suction port 19 is formed to have a large diameter, and the inlet 14 is formed to have a small diameter. Therefore, the inlet 14 and the suction port 19 are substantially circular and can be easily formed.

Further, a plate-shaped member 16 is arranged on the casing 6 on the front side of the impeller 7 so as to face the plurality of blade pieces 7B, and the plate-shaped member 16 is formed with a substantially circular second inlet 17 concentrically with the inlet 14. The diameter of the second inlet 17 was set to be substantially the same as or less than that of the inlet 14. Therefore, since the gap below the blade piece 7B can be reduced by the plate-shaped member 16 arranged to face the blade piece 7B, the bubble C falls downward when the bubble C is transferred to the outer peripheral side of the impeller 7. Can be suppressed, and the casing 6 can collide with the inner wall portion 6A and be satisfactorily destroyed to improve the defoaming ability. Then, the bubbles C that have passed through the small-diameter inlet 14 from the large-diameter suction port 19 reach the impeller 7 through the second inlet 17 formed in the plate-shaped member 16, so that the amount of air that sucks the bubbles C can be reduced. It can be suppressed.

Further, the diameter of the second inlet 17 is substantially the same as that of the inlet 14. Therefore, the bubbles C that have passed through the small-diameter inlet 14 from the large-diameter suction port 19 reach the impeller 7 through the second inlet 17 having substantially the same diameter as the inlet 14, so that the amount of air that sucks the bubbles C is reduced. Can be further suppressed.

3 and 4 show reference examples , the same parts as those in one embodiment are designated by the same reference numerals, description thereof will be omitted, and only different parts will be described.
The suction flow path 24 leading from the suction port 19 to the inside of the casing 6 via the inlet 22 and the second inlet 23 connects the suction port 19 and the inlet 22 with a flow path member 25. The suction port 19 has an opening formed at the lower end of the flow path member 25, and has a large diameter and a substantially circular shape with a large opening area. The inlet 22 has an opening formed at the upper end of the flow path member 25, has a small diameter and is formed to have a small opening area, and faces the front side of the impeller 7. The flow path member 25 is formed in a substantially trumpet shape of a curve in which a substrate 12 is inserted and an intermediate portion in the vertical direction is attached to the substrate 12 by welding, and the diameter is sequentially reduced from the suction port 19 toward the inlet 22. The inlet 22 and the suction port 19 are formed concentrically with different diameters having different opening areas. Similar to one embodiment, the suction port 19 preferably has an opening area of about 2.25 times and a diameter of about 1.5 times that of the inlet 22. The plate-shaped member 7D replaced with the plate-shaped member 16 of one embodiment is attached to the front side of the impeller 7 by covering six blade pieces 7B, and a second entrance 23 is formed in the central portion. The second entrance 23 is concentric with the entrance 22 and is formed to have substantially the same diameter as the entrance 22.

When the impeller 7 is rotationally driven by the electric motor 8, air is sucked from the suction port 19 into the casing 6 through the suction flow path 24 by the centrifugal action of the impeller 7, and is discharged from the discharge port 21. Then, the bubbles C generated on the liquid surface T are guided into the casing 6 through the suction flow path 24 and collide with the impeller 7. Part of the bubbles C is destroyed and disappears by this collision, and the droplets of the coolant liquid generated by this are subjected to centrifugal force by the centrifugal action of the impeller 7 together with the remaining bubbles C, and the outer periphery of the impeller 7 It is moved to the side and collides with the inner wall portion 6A of the casing 6. In this impact, substantially all of the remaining bubbles C are destroyed and disappear. Then, the droplets of the coolant liquid generated by the disappearance of the bubbles C are discharged from the discharge port 21 together with the air and returned to the liquid tank 1.

By this operation, when the bubbles C are sucked by the centrifugal action of the impeller 7, the defoaming area of the bubbles can be increased by the suction port 19 having a large opening area, and the opening can be increased, as in substantially the same as in one embodiment. Since the air volume for sucking bubbles can be increased by the inlet 22 having a reduced area, the suction capacity of bubbles can be improved without increasing the size of the device, and the defoaming area of bubbles C generated on the liquid level T of the liquid tank 1 can be reduced. It can be made larger. Further, the inlet 22 and the suction port 19 are substantially circular and can be easily formed.

Further, a plate-shaped member 7D was attached to the impeller 7 by covering six blade pieces 7B on the front side thereof, and a second inlet 23 was formed on the plate-shaped member 7D. Therefore, the plate-like member 7D attached to the impeller 7 so as to cover the blade piece 7B can close the lower part of the blade piece 7B, so that when the bubble C is transferred to the outer peripheral side of the impeller 7, the bubble C moves downward. It is possible to suppress the fall, collide with the inner wall portion 6A of the casing 6 and satisfactorily destroy it, and the defoaming ability can be improved. Then, the bubbles passing through the small-diameter inlet 22 from the large-diameter suction port 19 reach the impeller 7 through the second inlet 23 formed in the plate-shaped member 7D, so that the reduction in the air volume for sucking the bubbles C is suppressed. can do.

Further, the diameter of the second inlet 23 is substantially the same as that of the inlet 22. Therefore, the bubbles passing through the small-diameter inlet 22 from the large-diameter suction port 19 reach the impeller 7 through the second inlet 23 having substantially the same diameter as the inlet 22, so that the air volume for sucking the bubbles C can be reduced. It can be further suppressed.

Further, the suction flow path 24 is connected between the suction port 19 and the inlet 22 by a substantially trumpet-shaped flow path member 25 having a curve that gradually reduces the diameter from the suction port 19 toward the inlet 22. Therefore, the air volume for sucking the bubbles C from the large-diameter suction port 19 through the small-diameter inlet 22 by the centrifugal action of the impeller 7 is further increased by the spiral action generated from the suction port 19 toward the inlet 22. can do.

1: Liquid tank 2: Defoaming device 6: Casing 6A: Inner wall part 7: Impeller 7B: Blade piece 8: Electric motor 16, 7D: Plate-shaped member 17, 23: Second inlet 14, 22: Inlet 19: Suction port 20, 24: Suction flow path 21: Discharge port 25: Flow path member T: Liquid level C: Bubble

Claims (2)

An impeller with a plurality of impellers extending in the radial direction from the center, a casing containing the impeller inside, and an entrance and an entrance that open toward the center of the impeller on the front side of the casing facing the impeller. A suction port that is located lower in the vertical direction and sucks bubbles generated on the liquid surface of the liquid tank, a suction flow path that leads from the suction port through the inlet to the inside of the casing, and centrifugal force due to the centrifugal action of the impeller. The liquid tank together with air is filled with air due to the collision of the inner wall of the casing with the inner wall of the casing and the inner wall of the casing that collide with each other so that the bubbles transferred from the inlet to the outer circumference of the impeller are destroyed. It is equipped with a discharge port that discharges inward and an electric motor that rotates and drives the impeller from behind the casing. The inlet and suction port are arranged concentrically with different diameters and are formed concentrically with different opening areas. A large diameter has a large opening area, a small diameter has a small opening area, a plate-shaped member is attached to the casing on the front side of the impeller facing a plurality of blade pieces, and the plate-shaped member has an entrance. A defoaming device characterized in that a substantially circular second inlet is formed concentrically with the above, and the diameter of the second inlet is equal to or less than the diameter of the inlet.
The defoaming device according to claim 1 , wherein the second inlet has a diameter substantially the same as that of the inlet.

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