Defoaming device

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]

[0001] The present invention relates to a defoamer that destroys and eliminates foam by sucking it up, and more particularly to a defoamer that can effectively eliminate foam that forms on the surface of liquid stored in a liquid tank. [Background technology]

[0002] In conventional foam breakers, bubbles that form on the liquid surface of a liquid tank are sucked in by the rotation of a rotor (impeller), and these bubbles are transferred to the outer periphery of the rotor by centrifugal action, where they are destroyed by shear stress from multiple foam breaker walls provided on the outer periphery of the rotor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-22992 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such conventional defoaming devices, the main body base is directly attached to the liquid tank that stores the liquid, and therefore if the liquid tank is small, there is not enough space to install it, which has been a problem.

[0005] An object of the present invention is to provide a defoaming device that can be installed even in a small liquid tank. [Means for solving the problem]

[0006] In order to achieve this object, the present invention takes the following measures: An impeller having a plurality of blades extending radially from the center, and a rotor housing the impeller therein. and attach the plate-shaped circuit board The casing and the front side of the casing facing the impeller open towards the center of the impeller. Form a through hole in the substrateThe system is comprised of an inlet, an inner wall of a casing on the outer periphery of the impeller against which bubbles that have been transferred from the inlet to the outer periphery of the impeller due to the centrifugal force of the impeller collide so as to be destroyed, a storage tank that stores liquid resulting from the bubbles colliding with the inner wall of the casing, and an electric motor that drives the impeller from behind the casing. Configure Main body and , the main body is a liquid tank Vertically above Spaced apart and a base plate of the casing. A cylindrical member having a suction channel formed therein and connect the suction flow path of the cylindrical member to the inlet, The cylindrical member is a defoaming device characterized in that the suction port opening at the tip of the suction flow path is positioned opposite to the bubbles that form on the liquid surface of the liquid tank.

[0007] In this case, a discharge flow path may be provided that connects the container tank and the liquid tank. ,before The cylindrical member may be attached to the casing at an angle to the vertical direction, and the length of the cylindrical member between the inlet and the suction port may be adjustable. [Effects of the Invention]

[0008] As described above in detail, the invention described in claim 1 comprises an impeller, Attaching a plate-shaped circuit board A casing; Forming a through hole in the substrate From the inlet, the inner wall, the storage tank, and the motor Configure Main body and, The main body is a liquid tank. Vertically above Spaced apart and a base plate of the casing. A cylindrical member having a suction channel formed therein and connect the suction flow path of the cylindrical member to the inlet, The suction port of the cylindrical member is positioned at the tip of the suction flow path so that it faces the bubbles that form on the liquid surface of the liquid tank. Therefore, there is no need to install a main body on the liquid tank, and the defoaming device can be installed even in a small liquid tank.

[0009] Furthermore, the invention described in claim 2 is provided with a discharge flow path connecting the storage vessel and the liquid tank, which allows the liquid resulting from the disappearance of bubbles to be efficiently returned to the liquid tank.

[0010] The invention described in claim 3 is , tubeThe shaped member is attached to the casing at a vertical incline, which allows the casing to be installed horizontally away from the vertical top of the liquid tank, making it possible to install the device even if there is an obstacle above the liquid tank, thereby increasing the degree of freedom in installation.

[0011] In addition, in the invention described in claim 4, the length between the inlet and the suction port of the cylindrical member is adjustable, which allows the suction port to be set at an optimal position depending on the liquid level in the liquid tank, making it applicable to a wide range of uses. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a vertical cross-sectional view of a defoaming device according to an embodiment of the present invention. [Figure 2] FIG. 10 is a vertical cross-sectional view of a defoaming device according to another embodiment. [Figure 3] FIG. 10 is a vertical cross-sectional view of a defoaming device according to still another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 1 denotes a liquid tank for collecting and storing liquid such as coolant, installed on the ground D. 2 denotes a defoamer, with its main body 3 located vertically (up and down on the page) above the liquid tank 1 at a distance. 4A and 4B denote two roughly U-shaped leg members for the defoamer 2, with the main body 3 fixed to the top plate 1A of the liquid tank 1. 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, and an electric motor 9. The impeller 5 has multiple blades 5B attached to the front side of a circular disk 5A so that they extend radially from the center, and an input shaft 5C attached to the radial center. The outer periphery of the impeller 5, i.e., the radially outer ends of each blade 5B, are positioned opposite the inner wall portion 6A of the casing 6. The input shaft 5C passes through the casing 6, protrudes to the rear thereof, and is attached to an output shaft (not shown) of the electric motor 9.

[0014] The electric motor 9 is detachably mounted on a mounting plate 10 with multiple bolt members 11. A casing 6 is attached to the bottom of the mounting plate 10 via multiple bosses 12 by welding. The casing 6 is approximately cylindrical, closed at the top and open at the bottom, and houses the impeller 5 inside. A disk-shaped base plate 14, the storage tank 8, and leg members 4A and 4B are attached to the bottom of the casing 6 with multiple collar members 13 and gaps between them, and multiple bolt members 15 are used. The inlet 7 is approximately circular and extends through the radial center of the base plate 14 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 top surface of the base plate 14 by welding, and a substantially circular plate-like member 17 is attached to its upper end by welding, facing the blade piece 5B on the front side of the impeller 5. A second inlet 18 is formed in the plate-like member 17, concentric with the inlet 7 and having approximately the same diameter as the inlet 7.

[0015] A first cylindrical member 19, which is substantially cylindrical, is attached to the underside of the substrate 14 by welding, and a second cylindrical member 20, made of a flexible material, is fitted tightly around the first cylindrical member 19 by elastic force. Each cylindrical member 19, 20 extends through the top plate 1A of the liquid tank 1 and into the interior 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. A suction port 21 is opened at the tip of the second suction channel 20A, and the suction port 21 is positioned opposite bubbles C that form on the liquid surface T of the liquid tank 1. The vertical fitting dimension of the second cylindrical member 20 to the first cylindrical member 19 can be adjusted freely, and the length between the inlet 7 and the suction port 21 can be adjusted by increasing or decreasing the fitting dimension. The suction port 21 is generally circular and concentric with the inlet 7 , and is formed with a diameter slightly larger than that of the inlet 7 by the thickness of the first cylindrical member 19 .

[0016] The storage tank 8 contains liquid that is produced when bubbles collide with the inner wall 6A of the casing 6 and then disappear. This liquid flows into the storage tank 8 through gaps formed by multiple collars 13 between the lower part of the casing 6 and the base plate 14. A substantially cylindrical first discharge flow path member 22 is attached by welding to the underside of the storage tank 8, and a second discharge flow path member 23 made of a flexible material is fitted tightly around the first discharge flow path member 22 by elastic force. The second discharge flow path member 23 passes through the top plate 1A of the liquid tank 1 and extends into the interior of the liquid tank 1, with its tip immersed in the liquid stored in the liquid tank 1. A first discharge flow path 22A is formed in the first discharge flow path member 22, and a second discharge flow path 23A is formed in the second discharge flow path member 23. The storage tank 8 and the liquid tank 1 are connected by the discharge flow paths 22A and 23A. The second discharge flow path member 23 is configured so that the vertical fitting dimension that fits externally to the first discharge flow path member 22 can be increased or decreased freely, and the length dimension between the storage tank 8 and the tip of the second discharge flow path member 23 can be adjusted by increasing or decreasing the fitting dimension.

[0017] Next, the operation of this configuration will be described. When the impeller 5 is driven to rotate by the electric motor 9, the centrifugal action of the impeller 5 causes air to be sucked into the casing 6 from the suction port 21 through the suction flow paths 20A, 19A, the inlet 7, and the second inlet 18, and this air is then discharged into the storage tank 8 through the gap between the bottom of the casing 6 and the substrate 14, and is released to the atmosphere.

[0018] The bubbles C formed on the liquid surface T are then guided into the casing 6 via the suction flow paths 20A, 19A, the inlet 7, and the second inlet 18, and collide with the impeller 5. Some of the bubbles C are destroyed and disappear upon this collision, and the resulting droplets, along with the remaining bubbles C, are subjected to centrifugal force by the centrifugal action of the impeller 5 and are transported to the outer periphery of the impeller 5, where they collide with the inner wall portion 6A of the casing 6. Substantially all of the remaining bubbles C are destroyed and disappear upon this collision. The liquid produced upon the disappearance of the bubbles C then flows through the gap between the lower part of the casing 6 and the substrate 14, and is stored in the storage tank 8. The liquid stored in the storage tank 8 then flows through the discharge flow paths 22A, 23A and is returned to the liquid tank 1.

[0019] With this operation, the impeller 5, casing 6, inlet 7, inner wall portion 6A, storage tank 8, and motor 9 constitute the main body 3, which is positioned apart from the liquid tank 1, and cylindrical members 19 and 20, which form suction flow paths 19A and 20A connected to the inlet 7, are attached to the casing 6, and the suction ports 21 opening at the ends of the suction flow paths 19A and 20A of the cylindrical members 19 and 20 are positioned opposite the bubbles C generated on the liquid surface T of the liquid tank 1. Therefore, the main body 3 does not need to be installed in the liquid tank 1, and the defoaming device 2 can be installed even in a small liquid tank 1.

[0020] Furthermore, discharge flow paths 22A and 23A are provided to connect the container 8 and the liquid tank 1. This allows the liquid resulting from the disappearance of bubbles to be efficiently returned to the liquid tank 1.

[0021] Furthermore, the length between the inlet 7 and the suction port 21 of the cylindrical members 19 and 20 can be adjusted. This allows the suction port 21 to be set to an optimal position depending on the liquid level T in the liquid tank 1, making it suitable for a wide range of uses.

[0022] FIG. 2 shows another embodiment of the present invention, in which the same parts as those in the first embodiment are given the same reference numerals and their explanations are omitted, and only the different parts will be explained. First cylindrical member 24 is attached by welding to the underside of substrate 14 at an incline in the vertical direction. Second cylindrical member 25 is made of a flexible material and is fitted tightly around first cylindrical member 24 by elastic force. First suction flow path 24A formed in first cylindrical member 24 and second suction flow path 25A formed in second cylindrical member 25 are inclined in the vertical direction, just like first cylindrical member 24 and second cylindrical member 25. Suction port 26 opening at the tip of second suction flow path 20A is inclined with respect to liquid level T of liquid tank 1 and is positioned opposite bubble C.

[0023] The two leg members 27A, 27B that secure the main body 3 have different shapes. One leg member 27A is generally L-shaped and is attached to the casing 6 via a collar member 13 with bolt members 15, with its tip grounded and fixed to the ground D. The other leg member 27B is also generally L-shaped and has a shorter length than the first leg member 27A. It is attached to the casing 6 via a collar member 13 with bolt members 15, with its tip fixed to the top plate 1A of the liquid tank 1.

[0024] In operation, when the impeller 5 is driven to rotate by the electric motor 9, the centrifugal action of the impeller 5 draws air from the suction port 26 through the suction channels 25A and 24A into the casing 6, where it is discharged into the storage tank 8 and released to the atmosphere. Then, bubbles C formed on the liquid surface T are guided into the casing 6 via the suction channels 25A and 24A, the inlet 7, and the second inlet 18, and collide with the impeller 5. Some of the bubbles C are destroyed and disappear upon this collision. The resulting droplets, along with the remaining bubbles C, are subjected to centrifugal force by the centrifugal action of the impeller 5 and are transported to the outer periphery of the impeller 5, where they collide with the inner wall portion 6A of the casing 6. Substantially all of the remaining bubbles C are destroyed and disappear upon this collision. The liquid resulting from the disappearance of the bubbles C is then stored in the storage tank 8. The liquid stored in the storage tank 8 then flows through the discharge channels 22A and 23A and is returned to the liquid tank 1.

[0025] With this operation, cylindrical members 24, 25, which form suction flow paths 24A, 25A connected to inlet 7, are attached to casing 6, and cylindrical members 24, 25 are arranged so that suction ports 26 opening at the ends of suction flow paths 24A, 25A face bubbles C generated on liquid surface T of liquid tank 1. Therefore, substantially as in the first embodiment, there is no need to install main body 3 in liquid tank 1, and therefore defoaming device 2 can be installed even in a small liquid tank 1.

[0026] Furthermore, similarly to the first embodiment, discharge flow paths 22A and 23A are provided to connect the container 8 and the liquid tank 1, so that the liquid resulting from the disappearance of bubbles can be efficiently returned to the liquid tank 1.

[0027] Furthermore, the length between the inlet 7 and the suction port 26 of the cylindrical members 24 and 25 can be adjusted. Therefore, similar to the first embodiment, the suction port 26 can be set to an optimum position depending on the liquid level T of the liquid tank 1, making it applicable to a wide range of uses.

[0028] Furthermore, the main body 3 is positioned vertically above the liquid tank 1 at a distance, and the cylindrical members 24, 25 are attached to the casing 6 at an incline in the vertical direction. This allows the casing 3 to be installed by shifting it horizontally from vertically above the liquid tank 1, which makes it possible to install the liquid tank 1 even if there is an obstacle above it, thereby increasing the degree of freedom in installation.

[0029] FIG. 3 shows yet another embodiment of the present invention. The same parts as those in the first embodiment are given the same reference numerals and their explanations are omitted, and only the different parts will be explained. Two leg members 28A, 28B are integrally formed on the underside of the storage tank 8, protruding downward from radially symmetrical positions. Each leg member 28A, 28B is formed in the same approximately L-shape, and its tip is fixed to the top plate 1A of the liquid tank 1.

[0030] In operation, substantially similar to the first embodiment, air is sucked into the casing 6 through the suction port 21 by the centrifugal action of the impeller 5, and is discharged into the storage tank 8 through the gap between the bottom of the casing 6 and the base plate 14, where it is released to the atmosphere. Bubbles C formed on the liquid surface T are guided into the casing 6 and collide with the impeller 5, where some of them are broken and disappear. The resulting liquid droplets, along with the remaining bubbles C, are subjected to centrifugal force by the centrifugal action of the impeller 5 and move toward the outer periphery of the impeller 5, where they collide with the inner wall portion 6A of the casing 6. By this collision, substantially all of the remaining bubbles C are broken and disappear, and the liquid resulting from the disappearance of the bubbles C is stored in the storage tank 8. The liquid stored in the storage tank 8 then flows through the discharge flow paths 22A and 23A and is returned to the liquid tank 1.

[0031] With this operation, similarly to the first embodiment, it is not necessary to install the main body 3 in the liquid tank 1, and therefore the defoaming device 2 can be installed even in a small liquid tank 1. Furthermore, since discharge flow paths 22A, 23A are provided to connect the storage tank 8 and the liquid tank 1, the liquid resulting from the disappearance of bubbles can be efficiently returned to the liquid tank 1. Furthermore, since the length between the inlet 7 and the suction port 21 of the cylindrical members 19, 20 is adjustable, the suction port 21 can be set to an optimal position depending on the liquid level T in the liquid tank 1, and this allows for application to a wide range of uses.

[0032] Furthermore, the leg members 28A and 28B are formed integrally with the storage tub 8. This eliminates the need to assemble the storage tub 8 and the leg members 28A and 28B, thereby simplifying the assembly process.

[0033] In 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 it is of course possible to provide one leg member or three or more leg members. [Explanation of symbols]

[0034] 1: Liquid tank 2:Defoaming device 3: Main body 5: Impeller 6: Casing 6A:Inner wall part 7:Entrance 8: Containment tank 9: Electric motor 19, 24: First cylindrical member (cylindrical member) 19A, 24A: 1st suction flow path (suction flow path) 20, 25: Second cylindrical member (cylindrical member) 20A, 25A: Second suction flow path (suction flow path) 21, 26: Suction port T:Liquid level C: Foam

Claims

1. a main body comprising an impeller having a plurality of blades extending radially from a center, a casing accommodating the impeller therein and having a plate-like base plate attached thereto, an inlet formed through the base plate on the front side of the casing facing the impeller so as to open toward the center of the impeller, an inner wall portion of the casing on the outer periphery of the impeller against which bubbles migrate from the inlet to the outer periphery of the impeller due to centrifugal force caused by the centrifugal action of the impeller and collide to be destroyed, a storage tank for storing liquid resulting from the bubbles colliding with the inner wall portion of the casing, and an electric motor for driving the impeller from behind the casing, and leg members for fixing the main body to a liquid tank so as to be spaced apart vertically above the liquid tank, wherein a cylindrical member having a suction flow path attached to the base plate of the casing, the suction flow path of the cylindrical member being connected to the inlet, and the cylindrical member having a suction port opening at a tip of the suction flow path, positioned to face bubbles formed on the liquid surface of the liquid tank.

2. 2. The foam eliminating device according to claim 1, further comprising a discharge passage connecting the storage tank and the liquid tank.

3. A defoaming device as described in either claim 1 or 2, characterized in that the tubular member is attached to the casing at a vertical incline.

4. 4. The foam defoaming device according to claim 1, wherein the length of the cylindrical member between the inlet and the suction port is adjustable.

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