JP2023010094A - Defoaming device - Google Patents

Abstract

To provide a defoaming device which enables even a small liquid tank to be installed.SOLUTION: In a defoaming device, a body part 3 comprises: an impeller 5; a casing 6; an inlet 7; an inner wall portion 6A; a housing tank 8; and an electric motor 9. The body part 3 is arranged spaced apart from a liquid tank 1. Cylindrical members 19, 20 formed with suction passages 19A, 20A connected to the inlet 7 are attached to the casing 6. In the cylindrical member 20, a suction port 21 which is open at a tip of the suction passage 20A is disposed facing foam C occurring on a liquid surface T of the liquid tank 1.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an anti-foaming device that destroys and eliminates bubbles by sucking them, and more particularly to an anti-foaming device capable of satisfactorily eliminating 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 by the rotation of the rotor blade (impeller), and the bubbles are transferred to the outer circumference of the rotor blade by centrifugal action. It disappears due to the shear stress of multiple defoaming walls provided on the side. (See Patent Document 1, for example).

Japanese Patent Application Laid-Open No. 2010-22992

However, in such a conventional defoaming device, since the main body base is directly attached to the liquid tank that stores the liquid, there is a problem that if the liquid tank is small, the space for installation cannot be secured and cannot be installed. there was a point

An object of the present invention is to provide a defoaming device that can be installed even in a small liquid tank.

In order to achieve this task, the present invention takes the following means. Namely
An impeller having a plurality of blade pieces extending radially from the center, a casing housing the impeller inside, an inlet opening toward the center of the impeller on the front side of the casing facing the impeller, and the blades. The inner wall of the casing provided on the outer circumference of the impeller collides with the inner wall of the casing, which collides to break the bubbles transferred from the inlet to the outer peripheral side of the impeller under the centrifugal force of the centrifugal action of the wheel, and the bubbles when colliding with the inner wall of the casing. The main body is composed of a storage tank that stores liquid caused by disappearance and an electric motor that rotates an impeller from behind the casing. The defoaming device is characterized in that a cylindrical member is attached to a casing, and the cylindrical member has a suction port that opens at the tip of a suction channel and is arranged to face bubbles generated on the liquid surface of the liquid tank.

In this case, a discharge channel may be provided to connect between the storage tank and the liquid tank. Also, the main body may be vertically spaced above the liquid tank, and the cylindrical member may be attached to the casing with a vertical inclination. Further, the cylindrical member may be adjustable in length between the inlet and the suction port.

As described in detail above, the invention according to claim 1 comprises an impeller, a casing, an inlet, an inner wall portion, a storage tank, and an electric motor, and the main body is separated from the liquid tank. A cylindrical member having a suction channel connected to the inlet is attached to the casing, and the cylindrical member has a suction port that opens at the tip of the suction channel so as to face bubbles generated on the liquid surface of the liquid tank. bottom. For this reason, since it is not necessary to install the main body in the liquid tank, the defoaming device can be installed even in a small-sized liquid tank.

Further, according to the second aspect of the present invention, a discharge channel is provided to connect between the storage tank and the liquid tank. Therefore, the liquid caused by the disappearance of the bubbles can be returned to the liquid tank satisfactorily.

In the third aspect of the invention, the main body is arranged above the liquid tank with a space therebetween in the vertical direction, and the tubular member is attached to the casing while being inclined in the vertical direction. As a result, the casing can be installed by shifting it horizontally from above the liquid tank in the vertical direction, so that it can be installed even if there is an obstacle above the liquid tank, and the degree of freedom in installation can be increased.

Further, according to the fourth aspect of the invention, the cylindrical member is adjustable in length between the inlet and the suction port. Therefore, the suction port can be set at an optimum position according to the liquid level in the liquid tank, and can be applied to a wide range of uses.

1 is a longitudinal sectional view of a defoaming device showing an embodiment of the present invention; FIG. It is a longitudinal cross-sectional view of a defoaming device showing another embodiment. It is a longitudinal cross-sectional view of a defoaming device showing still another embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
In FIG. 1, 1 is a liquid tank which collects and stores a liquid such as a coolant liquid, and is installed on the ground D. As shown in FIG. Defoaming device 2 has main body 3 spaced apart from liquid tank 1 in the vertical direction (vertical direction on the paper surface). Reference numerals 4A and 4B denote leg members of the defoaming device 2, which are substantially U-shaped and have two leg members. The main body 3 comprises an impeller 5, a casing 6, an inlet 7, an inner wall portion 6A of the casing 6, a storage tank 8, an electric motor 9 and the like. The impeller 5 has a plurality of blades 5B attached to the front side of a circular disk 5A so as to extend radially from the center, and an input shaft 5C attached to the center in the radial direction. The outer periphery of the impeller 5, that is, the radially outer end of each blade 5B is arranged to face the inner wall portion 6A of the casing 6. As shown in FIG. The input shaft 5C penetrates the casing 6, protrudes behind it, and is attached to the output shaft (not shown) of the electric motor 9. As shown in FIG.

The electric motor 9 is detachably attached to a mounting plate 10 with a plurality of bolt members 11 . The mounting plate 10 has a casing 6 welded to its lower portion through a plurality of bosses 12 . The casing 6 has a substantially cylindrical shape with a closed upper portion and an open lower portion, and accommodates the impeller 5 therein. A disc-shaped substrate 14, a storage tank 8, and leg members 4A and 4B are attached to the lower portion of the casing 6 with a plurality of bolt members 15 with a plurality of collar members 13 having a gap therebetween. The inlet 7 has a substantially circular shape and is formed through the substrate 14 at the radial center thereof toward the center of the impeller 5 on the front side of the casing 6 facing the impeller 5 . A cylindrical member 16 is attached to the upper surface of the substrate 14 by welding, and a substantially circular plate-like member 17 is attached to the upper end thereof by welding so as to face the blade 5B on the front side of the impeller 5 . The plate member 17 is formed with a second inlet 18 that is concentric with the inlet 7 and has substantially the same diameter as the inlet 7 .

A substantially cylindrical first tubular member 19 is attached to the lower surface of the substrate 14 by welding, and a second tubular member 20 made of a flexible material is attached to the first tubular member 19 by elastic force. It is fitted on the outside. Each of the tubular members 19 and 20 extends inside the liquid tank 1 through the top plate 1A of the liquid tank 1 . A first suction channel 19A connected to the inlet 7 is formed in the first cylindrical member 19, and a second suction channel 20A connected to the first suction channel 19A is formed in the second cylindrical member 20. there is A suction port 21 is opened at the tip of the second suction channel 20</b>A, and the suction port 21 is arranged to face bubbles C generated on the liquid surface T of the liquid tank 1 . The second cylindrical member 20 is provided with a vertical fitting dimension for external fitting to the first cylindrical member 19 so as to be freely increased or decreased, and the length dimension between the inlet 7 and the suction port 21 is adjusted by increasing or decreasing the fitting dimension. making it possible. The suction port 21 has a substantially circular shape concentric with the inlet 7 and is slightly larger in diameter than the inlet 7 by the thickness of the first cylindrical member 19 .

The storage tank 8 stores the liquid generated by the collision of the bubbles against the inner wall 6</b>A of the casing 6 and the disappearance of the bubbles. This liquid flows out into the reservoir 8 through the gap formed by the collars 13 between the lower part of the casing 6 and the substrate 14 . A substantially cylindrical first discharge channel member 22 is attached to the lower surface of the storage tank 8 by welding. It is closely attached and fitted on the outside. The second discharge channel member 23 extends through the top plate 1A of the liquid tank 1 and extends inside the liquid tank 1, and the tip of the second discharge channel member 23 is immersed in the liquid stored in the liquid tank 1. As shown in FIG. A first discharge channel 22A is formed in the first discharge channel member 22, and a second discharge channel 23A is formed in the second discharge channel member 23. It connects with the liquid tank 1. The second discharge channel member 23 is provided with a vertical fitting dimension to be externally fitted to the first discharge channel member 22 so that it can be increased or decreased. The length dimension between is adjustable.

Next, the operation of such a configuration will be explained.
When the impeller 5 is rotationally driven by the electric motor 9, the centrifugal action of the impeller 5 draws air into the casing 6 from the suction port 21 through the suction channels 20A and 19A, the inlet 7, and the second inlet 18. The air is discharged from the gap between the lower part of the casing 6 and the substrate 14 into the storage tank 8 and released to the atmosphere.

The bubbles C generated on the liquid surface T are guided into the casing 6 via the suction channels 20A, 19A, the inlet 7, and the second inlet 18, and collide with the impeller 5. As shown in FIG. Some of the bubbles C are destroyed by this collision and disappear, and the droplets generated thereby are subjected to centrifugal force by the centrifugal action of the impeller 5 together with the remaining bubbles C, and flow toward the outer periphery of the impeller 5. It is transferred and hits the inner wall portion 6A of the casing 6. As shown in FIG. By this collision, substantially all of the remaining bubbles C are destroyed and disappear. Liquid generated by disappearance of the bubbles C flows through the gap between the lower portion of the casing 6 and the substrate 14 and is stored in the storage tank 8 . The liquid stored in the storage tank 8 is returned to the liquid tank 1 through the discharge channels 22A and 23A.

By such operation, the body portion 3 is composed of the impeller 5, the casing 6, the inlet 7, the inner wall portion 6A, the storage tank 8, and the electric motor 9, and the body portion 3 is arranged apart from the liquid tank 1. Then, cylindrical members 19 and 20 having suction flow paths 19A and 20A connected to the inlet 7 are attached to the casing 6, and the cylindrical members 19 and 20 have suction ports 21 opening at the ends of the suction flow paths 19A and 20A. It was arranged to face the bubbles C generated on the liquid surface T of the liquid tank 1 . Therefore, since the body portion 3 does not need to be installed in the liquid tank 1, the defoaming device 2 can be installed even in a small-sized liquid tank 1. - 特許庁

In addition, discharge flow paths 22A and 23A connecting between the storage tank 8 and the liquid tank 1 are provided. Therefore, the liquid caused by the disappearance of the bubbles can be returned to the liquid tank 1 satisfactorily.

In addition, the length between the inlet 7 and the suction port 21 of the tubular members 19 and 20 is adjustable. Therefore, the suction port 21 can be set at an optimum position according to the liquid surface T of the liquid tank 1, and can be applied to a wide range of applications.

FIG. 2 shows another embodiment of the present invention, the same parts as in the first embodiment are denoted by the same reference numerals, the description thereof is omitted, and only the different parts are described.
The first tubular member 24 is attached to the lower surface of the substrate 14 by welding while being inclined in the vertical direction. The second tubular member 25 is made of a flexible material, and is fitted onto the first tubular member 24 by elastic force. The first suction flow path 24A formed in the first tubular member 24 and the second suction flow path 25A formed in the second tubular member 25 are perpendicular to each other like the first tubular member 24 and the second tubular member 25. sloping in the direction A suction port 26 that opens at the tip of the second suction channel 20A is inclined with respect to the liquid surface T of the liquid tank 1 and arranged to face the foam C. As shown in FIG.

The two leg members 27A and 27B that fix the main body 3 have different shapes. One leg member 27A is substantially L-shaped, is attached to the casing 6 via the collar member 13 by the bolt member 15, and is grounded and fixed to the ground D at its tip. The other leg member 27B is substantially L-shaped with a length dimension shorter than that of the one leg member 27A. Fixed.

When the impeller 5 is driven to rotate by the electric motor 9, air is sucked into the casing 6 from the suction port 26 through the suction passages 25A and 24A due to the centrifugal action of the impeller 5, and discharged into the storage tank 8. Open to the atmosphere. The bubbles C generated on the liquid surface T are guided into the casing 6 through the suction channels 25A, 24A, the inlet 7, and the second inlet 18, and collide with the impeller 5. As shown in FIG. Some of the bubbles C are destroyed by this collision and disappear, and the droplets generated thereby are subjected to centrifugal force by the centrifugal action of the impeller 5 together with the remaining bubbles C, and flow toward the outer periphery of the impeller 5. It is transferred and hits the inner wall portion 6A of the casing 6. As shown in FIG. By this collision, substantially all of the remaining bubbles C are destroyed and disappear. Liquid generated by disappearance of the bubbles C is stored in the storage tank 8 . The liquid stored in the storage tank 8 is returned to the liquid tank 1 through the discharge channels 22A and 23A.

By this operation, the cylindrical members 24 and 25 formed with the suction flow paths 24A and 25A connected to the inlet 7 are attached to the casing 6, and the cylindrical members 24 and 25 are suction ports opening at the ends of the suction flow paths 24A and 25A. 26 was arranged to face the bubbles C generated on the liquid surface T of the liquid tank 1 . For this reason, substantially the same as in the first embodiment, the liquid tank 1 does not need to be provided with the main body 3, so the defoaming device 2 can be provided even in a small-sized liquid tank 1. FIG.

Further, in substantially the same manner as in the first embodiment, the discharge channels 22A and 23A connecting the storage tank 8 and the liquid tank 1 are provided, so that the liquid caused by the disappearance of the bubbles can be returned to the liquid tank 1 satisfactorily. .

Further, the cylindrical members 24 and 25 are made adjustable in length between the inlet 7 and the suction port 26 . Therefore, the suction port 26 can be set at an optimum position according to the liquid surface T of the liquid tank 1, substantially similar to the one embodiment, and can be applied to a wide range of applications.

Further, the body portion 3 is arranged above the liquid tank 1 with a space therebetween in the vertical direction, and the cylindrical members 24 and 25 are attached to the casing 6 so as to be inclined in the vertical direction. For this reason, the casing 3 can be installed by shifting it horizontally from above the liquid tank 1 in the vertical direction, so that it can be installed even if there is an obstacle above the liquid tank 1, increasing the degree of freedom in installation. can.

FIG. 3 shows still another embodiment of the present invention, the same reference numerals are assigned to the same parts as in the first embodiment, and the explanation is omitted, and only the different parts will be explained.
Two leg members 28A and 28B are integrally formed on the lower surface of the storage tank 8 so as to protrude downward from symmetrical positions in the radial direction. Each of the leg members 28A and 28B has the same shape and is substantially L-shaped, and the tip thereof is fixed to the top plate 1A of the liquid tank 1. As shown in FIG.

The operation is substantially the same as in one embodiment, and the air sucked into the casing 6 from the suction port 21 by the centrifugal action of the impeller 5 is discharged from the gap between the lower part of the casing 6 and the substrate 14 into the storage tank 8. It is open to the atmosphere. The bubbles C generated on the liquid surface T are guided into the casing 6 and collide with the impeller 5, and some of them are destroyed and disappear. Due to the centrifugal force of the impeller 5 , the resulting liquid droplets, together with the remaining bubbles C, are transferred to the outer peripheral side of the impeller 5 and collide with the inner wall portion 6A of the casing 6 . By this collision, substantially all of the remaining bubbles C are destroyed and disappeared, and the liquid generated by the disappearance of the bubbles C is stored in the storage tank 8 . The liquid stored in the storage tank 8 is returned to the liquid tank 1 through the discharge channels 22A and 23A.

With this operation, it is possible to install the defoaming device 2 even in a small liquid tank 1 because the main body 3 does not need to be installed in the liquid tank 1 in substantially the same manner as in the first embodiment. Further, since the discharge passages 22A and 23A connecting the storage tank 8 and the liquid tank 1 are provided, the liquid caused by the disappearance of the bubbles can be returned to the liquid tank 1 satisfactorily. Further, since the cylindrical members 19 and 20 are adjustable in length between the inlet 7 and the suction port 21, the suction port 21 can be set at an optimum position according to the liquid level T of the liquid tank 1. , can be applied to a wide range of applications.

Further, the leg members 28A and 28B are integrally formed with the storage tank 8. As shown in FIG. Therefore, it is possible to eliminate the need to assemble the storage tank 8 and the leg members 28A and 28B, thereby simplifying the assembling.

In each of the above-described embodiments, two leg members 4A, 4B, 27A, 27B, 28A, and 28B are provided, but the present invention is not limited to this, and one leg member or three or more leg members may be provided. Of course.

1: Liquid tank 2: Antifoaming device 3: Body part 5: Impeller 6: Casing 6A: Inner wall part 7: Inlet 8: Storage tank 9: Electric motor 19, 24: First tubular member (tubular member)
19A, 24A: First suction channel (suction channel)
20, 25: Second tubular member (tubular member)
20A, 25A: Second suction channel (suction channel)
21, 26: suction port T: liquid surface C: foam

Claims (4)

An impeller having a plurality of blade pieces extending radially from the center, a casing housing the impeller inside, an inlet opening toward the center of the impeller on the front side of the casing facing the impeller, and the blades. The inner wall of the casing provided on the outer circumference of the impeller collides with the inner wall of the casing, which collides to break the bubbles transferred from the inlet to the outer peripheral side of the impeller under the centrifugal force of the centrifugal action of the wheel, and the bubbles when colliding with the inner wall of the casing. The main body is composed of a storage tank that stores liquid caused by disappearance and an electric motor that rotates an impeller from behind the casing. A defoaming device, comprising: a cylindrical member mounted on a casing, wherein the cylindrical member has a suction port that opens at the tip of a suction flow path and is disposed so as to face bubbles generated on the liquid surface of a liquid tank. 2. The defoaming device according to claim 1, further comprising a discharge channel connecting said storage tank and said liquid tank. 3. The apparatus according to claim 1, wherein said main body is vertically spaced above the liquid tank, and said cylindrical member is attached to said casing at an angle in the vertical direction. Defoaming device as described. The defoaming device according to any one of claims 1 to 3, wherein the cylindrical member is adjustable in length between the inlet and the suction port.

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