JP2008259959A - Centrifugal defoamer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugal defoamer further accurately separating various raw liquid into bubbles and liquid by eliminating retention of bubbles in a rotor. <P>SOLUTION: The centrifugal defoamer has the rotor 2 rotatably composed around a rotary shaft, and separates raw liquid into defoamed liquid and foamed liquid by applying a centrifugal force to the raw liquid in a defoaming chamber 2b in the rotor. The defoamer has: an upper hollow shaft 3 having a lower bubble take-in port 3a extendedly disposed to the outside from the inside of the defoaming chamber 2b near the rotary shaft A of the rotor and positioned inside the defoaming chamber 2b, and a foamed liquid passage 11 therein and passing the foamed liquid therethrough; and a restriction plate 7 provided in the defoaming chamber 2b to face a first end wall 5 of the rotor 2 across the lower bubble take-in port 3a, and restricting the movement of bubbles by radially extended face in the horizontal direction. A defoamed liquid discharge port 4a discharging the deformed liquid to the outside of the rotor 2 is formed near the rotary shaft A of a second end wall 2d facing the restriction plate 7 of the rotor 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a centrifugal defoamer that removes air bubbles scattered in a liquid by utilizing centrifugal force, and in particular, industrial fields such as chemical, pharmaceutical, papermaking, fiber, printing, electronic materials, oil products, and cosmetics. The present invention relates to a centrifugal defoamer that continuously removes air bubbles mixed in a liquid during the manufacturing process of products such as foods, resins, paints, adhesives, and sealing materials.

  Conventionally, as a method for removing bubbles mixed in a liquid, a chemical method using an antifoaming agent or the like in the liquid and a physical method shown below can be given. Examples of the physical defoaming method include a method of leaving the liquid until the bubble and the liquid are naturally separated under natural pressure or reduced pressure, a method using a pressure roll method, a rotating screen method, and a reduced pressure thin film method. It is disclosed.

  However, the chemical method may be unpreferable depending on the application because components in the liquid change by adding an antifoaming agent or the like to the liquid. In addition, the physical method has a problem that in any of the above methods, it is difficult to defoam a liquid having a high viscosity, and it takes a long time to defoam. In addition, for example, when processing under reduced pressure, volatile components such as fragrances and solvents tend to evaporate in the liquid, the liquid properties become unstable, and a high precision vacuum pump is required. There are problems such as necessity and high equipment costs.

  A centrifugal defoamer that solves such problems is disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-131600. FIG. 7 is a cross-sectional view showing the configuration of this conventional centrifugal defoamer. A conventional centrifugal defoamer 101 is composed of a bottomed cylindrical container, and is configured to be configured to be rotatable about a rotation axis A1 extending in the vertical direction and an inner surface central portion of a bottom wall 102d of the rotor 102. And a hollow shaft 103 which is fixed and is erected in the vertical direction.

  The hollow shaft 103 has a double tube structure including an inner cylinder 104 and an outer cylinder 105 that is shorter than the inner cylinder 104 and has a larger inner diameter. The outer cylinder 105 of the hollow shaft 103 is fixed to the inner cylinder 104 by an outer cylinder fixing member 106 provided at the lowermost end of the outer cylinder 105, and is provided only at an intermediate portion excluding both ends of the inner cylinder 104. The upper outer peripheral surface of the inner cylinder 104 of the hollow shaft 103 is rotatably supported by a stock solution casing 122 to which a stock solution is supplied. The upper end of the outer cylinder 105 of the hollow shaft 103 communicates with the stock solution casing 122. At the lower end portion of the outer cylinder 105 of the hollow shaft 103, a raw solution supplied from the raw liquid casing 122 through a raw solution passage 112 formed between the inner cylinder 104 and the outer cylinder 105 is supplied to the rotor 102. A supply port 105a is provided.

  A rotation shaft 107 is provided at the center of the outer surface of the bottom wall 102 d of the rotor 102. The rotor 102 rotates when the rotary shaft 107 is rotated by a motor or the like (not shown) to move the bubbles in the undiluted solution supplied into the rotor 102 to the rotation axis A1 side of the rotor 102, thereby removing bubbles that do not contain bubbles. The liquid is moved to the outer region in the rotor 102 and separated into foam liquid and defoamed liquid.

  The lower end of the inner cylinder 104 of the hollow shaft 103 is fixed to the center of the inner surface of the bottom wall 102 d of the rotor 102. In the vicinity of the lower end of the inner cylinder 104 of the hollow shaft 103, a foam liquid inlet 104 a that communicates with the foam liquid passage 111 located inside the inner cylinder 104 is provided. The upper end of the inner cylinder 104 of the hollow shaft 3 communicates with the foam liquid casing 121 for discharging the separated foam liquid supplied from the foam liquid intake port 104a through the foam liquid passage 111.

  The rotor 102 is provided with a lid portion 108 having an opening 108a through which the hollow shaft 103 passes and the periphery of the opening 108a, and the separated defoaming liquid is passed between the outer cylinder 105 and the rotor 102. And a cylinder part 108b that forms a defoaming liquid passage 133 for discharging. A restriction plate 109 is provided above the stock solution supply port 105a of the outer cylinder 105 of the hollow shaft 103 in order to restrict the bubbles remaining in the separated defoaming liquid from moving to the defoaming liquid passage 113 side. Radially projecting in a direction intersecting the cylinder 105 is provided. The upper end of the defoaming liquid passage 113 communicates with the inside of the defoaming liquid casing 123 that supports the outer peripheral surface of the outer cylinder 105 and discharges the defoaming liquid.

  Note that the foam liquid casing 121, the stock liquid casing 122, and the defoamed liquid casing 123 do not rotate. In order to smoothly rotate the rotor 102 and the hollow shaft 103, the inner cylinder 104 and the outer cylinder 104 of the hollow shaft 103 are arranged. Bearings 131 to 133 are provided in the vicinity of the upper ends of the cylinder 105 and the cylinder portion 108b, and seal members 134 to 138 such as O-rings are provided to prevent leakage of liquid between the casings.

The conventional centrifugal defoamer 101 is configured as described above, so that defoaming treatment can be performed even for a relatively high-viscosity stock solution by means such as providing a regulating plate 109 for separating bubbles and liquid. Is possible. In addition, the stock solution is supplied to the rotor 102 in the vertical direction, and the foam solution and the defoamed solution are discharged in the vertical direction, so that the solution was supplied without causing problems such as separation of the stock solution in the hollow shaft 103. Since separation is performed after the stock solution moves into the rotor 102, the separation efficiency is also high.
JP 2005-131600 A

  However, in the conventional centrifugal defoamer 101, the moving direction of the bubbles in the stock solution supplied into the rotor 102 through the stock solution supply port 105a is opposite to the flow direction of the stock solution. Therefore, as shown in FIG. 7, there is a problem that in the region X <b> 100 below the restriction plate 109, air bubbles stay in balance in the opposite directions, and the defoaming effect of the centrifugal defoamer 101 decreases.

  In addition, since the hollow shaft 103 forming each passage is configured by a double tube structure of the inner tube 104 and the outer tube 105, the disassembly and assembly are complicated and the number of parts is larger than the single tube structure, Heavy weight. Furthermore, the tube diameter of the hollow shaft 103 is also increased. When the tube diameter of the hollow shaft 103 serving as the rotation shaft is large, the peripheral speed on the surface of the shaft is increased, which places a burden on the seal members 134 to 138. Moreover, if the tube diameter of the hollow shaft 103 is reduced to avoid this, the flow path area of the stock solution, the foam solution, or the defoaming solution is reduced, so that the internal pressure increases and the amount of defoaming treatment decreases. That is, in the conventional centrifugal defoamer 101 shown in FIG. 7, the trade-off is that if the defoaming amount is increased, the tube diameter of the hollow shaft 103 must be increased, and the burden on the seal members 134 to 138 is increased. Was in a relationship.

  Therefore, the technical problem to be solved by the present invention is to solve the problems of the centrifugal defoamer described above, and the defoaming effect is reduced by reducing the retention of bubbles in the rotor. It is in providing a centrifugal defoaming machine that can reduce the number of parts and reduce the number of parts to achieve weight reduction and increase in the amount of defoaming.

In order to solve the above technical problem, the present invention has a cylindrical box-shaped rotor configured to be rotatable about a rotation axis as a basic configuration, and is present in a defoaming treatment chamber in the rotor. And a defoaming treatment by applying centrifugal force to the stock solution containing bubbles, and a centrifugal defoamer that separates the defoamed liquid after the treatment into the foam liquid in which the bubbles are collected,
Arranged in the vicinity of the rotation axis of the rotor and extending from the defoaming chamber to the outside of the defoaming chamber through an opening formed in the vicinity of the rotation axis of the first end wall of the rotor. A hollow shaft in which a foam liquid passage through which the foam liquid passes is formed and a foam liquid intake port communicating with the defoaming chamber of the rotor is formed in a portion located in the defoaming chamber; ,
In the defoaming chamber, a surface is provided so as to face the first end wall of the rotor across the foam liquid inlet, and extends radially in a direction intersecting the hollow shaft. And a regulating plate that regulates the movement of bubbles by the surface,
A defoaming liquid discharge port for discharging the defoaming liquid to the outside of the rotor is formed in the vicinity of the rotation shaft of the second end wall facing the regulating plate of the rotor.
More specifically, a centrifugal defoamer having the following configuration is provided.

According to the first aspect of the present invention, it has a cylindrical box-shaped rotor configured to be rotatable around a rotation axis, and is present in a defoaming treatment chamber in the rotor and contains a bubble. A centrifugal defoamer that performs a defoaming process for collecting the bubbles in the vicinity of the rotation shaft by applying a centrifugal force by rotation, and separates the defoamed liquid after the treatment into the foamed liquid in which the bubbles are collected,
In the vicinity of the rotation axis of the rotor, it extends from the defoaming chamber to the outside of the defoaming chamber through an opening formed in the vicinity of the rotation shaft of the first end wall of the rotor. And a first liquid supply port that communicates with the defoaming chamber of the rotor is formed in a portion located in the defoaming chamber, with a stock solution supply port defined by an outer wall and the opening. A first hollow shaft having a foam liquid passage formed therein for allowing the foam liquid flowing from the first foam liquid intake port to flow to a portion located outside the defoaming treatment chamber;
In the defoaming treatment chamber, the foam liquid intake port is provided so as to face the first end wall of the rotor, in a direction intersecting the first hollow shaft and the first A regulating plate having a surface extending radially around the hollow shaft,
The defoaming chamber passes the defoaming liquid that has passed between the outer end of the restriction plate and the peripheral wall of the rotor in the vicinity of the rotation shaft of the second end wall facing the restriction plate of the rotor. A centrifugal defoamer is provided in which a defoaming liquid discharge port for discharging to the outside is formed.

  According to the second aspect of the present invention, the defoaming chamber is further disposed on the defoaming liquid outlet side of the regulating plate from the defoaming chamber of the rotor on the same rotational axis as the first hollow shaft. The defoaming liquid intake port is formed so as to extend through the second end wall to the outside, and is communicated with the defoaming treatment chamber in the vicinity of the end near the restriction plate. The centrifugal defoamer according to the first aspect, further comprising a second hollow shaft in which a defoaming liquid passage is formed, through which the defoaming liquid passes and communicates with the defoaming liquid discharge port. I will provide a.

According to the third aspect of the present invention, a cylinder portion is provided upright around the opening of the rotor, and the undiluted solution before defoaming treatment is formed by the outer wall of the first hollow shaft and the inner wall of the cylinder portion. A stock solution passage for guiding the stock solution to the stock solution supply port is defined,
The first aspect or the second aspect is characterized in that a second foam liquid intake port is provided on the outer wall of the first hollow shaft facing the cylinder portion to communicate the raw liquid passage and the foam liquid passage. A centrifugal deaerator according to the second aspect is provided.

According to the fourth aspect of the present invention, in the defoaming chamber, the first hollow shaft is provided between a portion adjacent to the stock solution supply port and the first foam solution intake port. A guide plate having a surface extending radially in a direction intersecting the first hollow shaft,
In the defoaming treatment chamber, a third foam liquid intake port that communicates the defoaming treatment chamber and the foam liquid passage is provided at a position between the guide plate and the stock solution supply port. A centrifugal defoamer according to the first aspect or the second aspect is provided.

  According to the fifth aspect of the present invention, the regulating plate has a surface on the defoamed liquid discharge port side from a central portion of the surface located on the rotation axis with respect to a direction orthogonal to the rotation axis. The centrifugal defoamer according to any one of the first aspect to the fourth aspect, wherein the centrifugal defoamer is inclined in a direction approaching the first end wall of the rotor as it goes toward an outer peripheral portion of the surface. .

  According to the present invention, the undiluted solution supplied into the rotor through the undiluted solution supply port moves to the regulating plate side through the undiluted solution supply port, and in the process, bubbles in the undiluted solution receive a centrifugal force due to the rotation of the rotor. Move to the rotating shaft side of the rotor. The restricting plate restricts the movement of the bubbles so that the bubbles moving toward the rotating shaft side of the rotor do not move toward the defoaming liquid discharge port side, and after the defoaming liquid moves to the outer region in the rotor, it is removed. The movement of the defoaming liquid is regulated so as to move to the foam liquid discharge port side. At this time, the undiluted solution moves (flows) in the direction from the undiluted solution supply port toward the regulating plate, and the centrifugal force due to the rotation of the rotor acts on the bubbles in the direction intersecting with the direction, so the direction of movement of the bubbles and the undiluted solution is opposite It is different without facing. Therefore, according to the present invention, it is possible to reduce the retention due to the balance between the movement direction of the bubbles and the stock solution.

Further, according to the present invention, since the hollow shaft can be configured with a single tube structure, it is easy to disassemble and assemble as compared with the double tube structure, and the number of parts can be reduced to achieve weight reduction. Furthermore, the tube diameter of the hollow shaft can be increased to increase the defoaming amount.
Furthermore, by providing a second foam liquid inlet for communicating the raw liquid passage and the foam liquid passage on the outer wall of the first hollow shaft facing the cylinder portion of the rotor, the size of the bubbles in the raw liquid can be reduced. Large bubbles can be taken into the bubble liquid passage in advance, and the separation efficiency can be increased as compared with the conventional apparatus.

Further, in the defoaming treatment chamber, the first hollow shaft radially extends in a direction intersecting the first hollow shaft between the portion adjacent to the stock solution supply port and the first foam liquid intake port. By providing a guide plate having a surface that exists, the movement path for separating the stock solution can be made longer than that of the conventional device, so that the amount of air bubbles taken into the foam liquid passage before being separated from the stock solution can be reduced. Therefore, the separation efficiency can be increased as compared with the conventional apparatus.
Furthermore, in the defoaming treatment chamber, a guide plate is provided by providing a third foam liquid intake port that communicates the defoaming treatment chamber and the foam liquid passage at a position between the guide plate and the stock solution supply port. Between the guide plate and the stock solution supply port without receiving the centrifugal force due to the rotation of the rotor between the guide plate and the stock solution supply port and being moved to the outer region inside the rotor by the guide plate Thus, the bubbles that have moved to the rotating shaft side of the rotor can be taken into the foam liquid passage. Thereby, separation efficiency can be made higher than providing only a guide plate.

  Further, the surface of the regulating plate on the side of the defoaming liquid discharge port is moved from the center of the surface located on the rotation axis to the outer periphery of the surface with respect to the direction orthogonal to the rotation axis. By inclining in the direction approaching the first end wall, even if the bubble moves beyond the regulating plate to the defoaming liquid discharge port side, the bubble is restricted when the rotation of the rotor is slowed or stopped. It moves to the outer area | region in a rotor along the said inclination, without staying in the center part by the side of the defoaming liquid discharge port, and can move to the foam liquid discharge port side. Thereby, the separation efficiency can be increased as compared with the conventional apparatus.

<< First Embodiment >>
Hereinafter, the centrifugal deaerator 1 according to the first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a sectional view showing a configuration of a centrifugal defoamer 1 according to the first embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. The centrifugal defoamer 1 is a device for removing bubbles in the stock solution by separating a stock solution in which a large number of bubbles are dispersed into a defoamed solution and a foam solution. The centrifugal defoamer 1 is composed of a substantially cylindrical box-like container, and is configured to be rotatable around a rotation axis A extending in the vertical direction, and in the vicinity of the rotation axis of the rotor 2, the rotor 2. A cylindrical upper hollow shaft 3 and a lower hollow, which are examples of first and second hollow shafts arranged so as to extend in the vertical direction from the inside of the defoaming treatment chamber 2b to the outside of the defoaming treatment chamber 2b And a shaft 4.

  The rotor 2 receives power from a motor (not shown) or the like and rotates around the rotation axis A (for example, as indicated by an arrow 50), thereby removing a stock solution in which a large number of bubbles are dispersed in the defoaming treatment chamber 2b. And foam liquid. That is, the rotor 2 rotates to move the liquid portion having a large specific gravity per unit volume to the outer region of the rotor 2 and move the bubble portion having a small specific gravity per unit volume to the rotation axis A side of the rotor 2. .

  The inner surface 2a of the peripheral wall of the rotor 2 is a rough surface, and is configured to increase the friction with the stock solution existing in the rotor 2 so that the rotational force of the rotor 2 is easily transmitted to the stock solution. As shown in FIG. 2, the peripheral wall inner surface 2 a of the rotor 2 may be attached with a resistance plate 2 c so that the rotation of the rotor 2 can be easily transmitted to the stock solution. In this case, the number of resistance plates 2c is preferably about 2 to 10. The resistance plate 2c preferably has a width of 1 to 20 mm and a height of 0.1 to 0.5 times that of the rotor 2.

  The rotor 2 includes a lid portion 5 as an example of a first end wall having an opening 5a through which the upper hollow shaft 3 passes, and a cylindrical cylinder erected upward in FIG. 1 around the opening 5a. Part 5b. The rotor 2 has a sealed structure except for various passage portions described later.

  A stock solution supply port 12 a is formed between the inner peripheral portion of the lid portion 5 that forms the opening 5 a of the lid portion 5 and the outer wall of the upper hollow shaft 3 that faces it. That is, the stock solution supply port 12 a is defined by the opening 5 a of the lid 5 and the outer wall of the upper hollow shaft 3. Between the inner wall of the cylinder part 5b of the rotor 2 and the outer wall of the upper hollow shaft 3, a stock solution passage 12 for guiding the stock solution to the stock solution supply port 12a is formed. That is, the stock solution passage 12 is defined by the inner wall of the cylinder portion 5 b of the rotor 2 and the outer wall of the upper hollow shaft 3.

  The stock solution passage 12 communicates with the defoaming chamber 2 b of the rotor 2 and the stock solution casing 22. The stock solution casing 22 rotatably supports the upper outer peripheral surface of the upper hollow shaft 3 and also supports the cylinder portion 5b of the rotor 2 by its bottom plate 22a. The stock solution casing 22 receives the stock solution supplied into the rotor 2 as shown by an arrow 53 from a supply port (not shown) provided on the side wall away from the rotation axis A, and the stock solution passage 12 is shown by an arrow 54. Then, it is supplied into the rotor 2 through the stock solution supply port 12a.

On the other hand, in the stock solution casing 122 of the above-described conventional example, bubbles in the stock solution may stay in the recess formed on the upper wall surface in FIG. 7 to reduce the defoaming effect of the apparatus.
For this reason, the stock solution casing 22 is formed so that there is no unevenness on the wall surface so that bubbles in the stock solution do not stay in the stock solution casing 22 and reduce the defoaming effect of the centrifugal defoamer 1.

  Inside the upper hollow shaft 3 is formed a foam liquid passage 11 through which the foam liquid in which bubbles are collected passes upward as shown by an arrow 52 in FIG. The thickness of the upper hollow shaft 3 can be set by operating conditions such as the properties of the stock solution, and the ratio of the inner radius R of the rotor 2 to the inner radius S of the upper hollow shaft 3 is 2: 1 to 20: 1. It is preferable to have such a thickness (see FIG. 2). If the upper hollow shaft 3 is thicker than the above range, the difference in centrifugal force necessary for air bubble separation does not occur so much that an effective defoaming effect cannot be obtained, and the effective volume of the rotor 2 decreases. Separation effect is reduced. Further, an excessive load is applied to the upper hollow shaft 3 and the bearings 31 and 32 provided in the vicinity of the upper end of the cylinder portion 5 b of the rotor 2.

On the outer wall portion of the upper hollow shaft 3 facing the cylinder portion 5 b of the rotor 2, that is, the outer wall portion of the upper hollow shaft 3 in contact with the stock solution passage 12, the foam liquid passage 11 and the stock solution passage 12 inside the upper hollow shaft 3 are provided. An upper foam liquid intake port 3b, which is an example of a second foam liquid intake port that communicates, is provided. Of the bubbles in the stock solution supplied into the rotor 2 through the stock solution passage 12 and the stock solution supply port 12a, the upper foam fluid intake port 3b has a size that is moved to the rotation axis A side of the stock solution passage 12 by the rotation of the rotor 2. Large bubbles (for example, 50 μm or more) are previously taken into the foam liquid passage 11 to improve the defoaming effect.
In addition, what is necessary is just to set suitably the magnitude | size and installation number of the top foam liquid inlet 3b according to operating conditions, such as the operating conditions and the property of the undiluted | stock solution to deaerate.

  In the vicinity of the lower end of the upper hollow shaft 3, a lower foam liquid take-up that is an example of a first foam liquid intake port that communicates the foam liquid passage 11 inside the upper hollow shaft 3 and the defoaming treatment chamber 2 b of the rotor 2. A slot 3a is formed. The upper end of the upper hollow shaft 3 communicates with a foam liquid casing 21 formed of a substantially bottomed cylindrical container whose lower part is fixed to the upper side of the stock solution casing 22. The foam liquid casing 21 receives the foam liquid fed through the lower foam liquid inlet 3 a and the foam liquid passage 11 as indicated by an arrow 52, and is indicated by an arrow 51 from a discharge port (not shown) provided in the foam liquid casing 21. So that it is discharged to the outside of the centrifugal deaerator 1.

On the other hand, the foamed liquid casing 121 of the conventional example has an inner diameter formed larger than the inner diameter of the upper hollow shaft 104, as shown in FIG. ) May cause bubbles in the foam liquid to stay and reduce the defoaming effect of the apparatus.
For this reason, the foam liquid casing 21 has an inner diameter of the foam liquid that moves in the direction indicated by the arrow 52 (upward in FIG. 1) through the foam liquid passage 11 inside the upper hollow shaft 3, so that the centrifugal defoaming occurs. In order not to reduce the defoaming effect of the machine 1, it is formed to have the same length as the inner diameter of the upper hollow shaft 3.
The foam liquid casing 21 is formed so that the inner diameter of the portion near the upper end of the upper hollow shaft 3 is substantially the same as the inner diameter of the upper hollow shaft 3, and the downstream side in the direction of movement of the foam liquid (upward direction in FIG. 1). It may be formed so that its inner diameter gradually increases as it goes to.
Further, the foam liquid casing 21 may be formed integrally with the stock liquid casing 22.

  The lower end of the upper hollow shaft 3 has a surface that blocks the foam liquid passage 11 and extends radially in a direction intersecting the upper hollow shaft 3 (for example, an orthogonal direction), and the movement of bubbles is regulated by the surface. For example, a substantially disc-shaped regulating plate 7 is fixed. The stock solution supplied into the defoaming treatment chamber 2b through the stock solution passage 12 and the stock solution supply port 12a is mainly defoamed and foamed liquid in the stock solution separation region X sandwiched between the regulating plate 7 and the lid 5. And separated.

  As shown in FIG. 2, the restriction plate 7 has a ratio of the inner radius R of the rotor 2 to the radius r1 of the restriction plate 7 from 10: 4, depending on the operation conditions such as the operation conditions and the properties of the stock solution to be defoamed. It can be appropriately modified so as to be in the range of 10: 9. In particular, when the radius r1 of the regulating plate 7 is smaller than the above range, the separation of the bubbles in the rotor 2 becomes incomplete, and the amount of bubbles mixed in the defoaming liquid increases, while when the size exceeds the above range, Although the separation effect is increased, the resistance for discharging the defoaming liquid is also increased, so that the amount of defoaming treatment per unit time is reduced or the pressure needs to be increased.

The surface 7b on the opposite side of the surface 7a that closes the liquid bubble passage 11 of the upper hollow shaft 3 of the restriction plate 7 follows the direction from the center of the surface 7b located on the rotation axis A toward the outer periphery, and approaches the lid 5 ( It is formed so as to incline (for example, protrude in a conical shape) in the upward direction in FIG. As a result, the bottom wall is an example of the second end wall of the restriction plate 7 and the rotor 2 by moving beyond the restriction plate 7 without being separated from the concentrate in the concentrate separation region X, that is, moving to the outer region of the rotor 2. A part of the bubbles in the stock solution moved to the defoaming liquid collection region Y sandwiched between 2d may not stay in the defoaming liquid collection region Y and return to the stock solution separation region X along the surface 7b. I can do it.
Near the center of the surface 7 b of the regulating plate 7, the lower hollow shaft 4 is fixed so as to extend in the vertical direction on the same rotational axis A as the upper hollow shaft 3. The lower hollow shaft 4 passes through the vicinity of the rotation axis A of the bottom wall 2d of the rotor 2, and a part of the outer peripheral surface of the lower hollow shaft 4d is the bottom wall 2d of the rotor 2 so that there is no liquid leakage in the defoaming chamber 2b. It is fixed to.

  Inside the lower hollow shaft 4, a defoamed liquid discharge port 4 b through which the defoamed liquid after the defoaming process passes and a defoamed liquid passage 13 are formed. In the vicinity of the upper end portion of the lower hollow shaft 4, a defoaming liquid intake 4 a that connects the defoaming liquid passage 13 and the defoaming treatment chamber 2 b of the rotor 2 is formed. A lower end of the lower hollow shaft 4 communicates with a defoaming liquid casing 23 formed of a substantially bottomed cylindrical container positioned below the rotor 2. The lower hollow shaft 4 is rotatably supported by the upper part 23a of the defoaming liquid casing 23 around the lower end portion thereof. The defoaming liquid casing 23 receives the defoaming liquid sent through the defoaming liquid intake port 4 a, the defoaming liquid discharge port 4 b and the defoaming liquid passage 13 as indicated by an arrow 55, and is provided in the defoaming liquid casing 23. As shown by an arrow 56, the discharge port (not shown) is discharged outside the centrifugal defoamer 1.

The inner diameter of the lower part 23 b of the defoaming liquid casing 23 is the same as that of the foaming liquid casing 21, and the defoaming moves in the direction indicated by the arrow 55 (downward in FIG. 1) through the defoaming liquid passage 13 inside the lower hollow shaft 4. It is formed so as to have the same length as the inner diameter of the lower hollow shaft 4 so that liquid bubbles do not stay and the defoaming effect of the centrifugal defoamer 1 is not lowered.
In addition, the lower part 23b of the defoaming liquid casing 23 is formed so that the inner diameter in the vicinity of the lower end of the lower hollow shaft 4 is substantially the same as the inner diameter of the lower hollow shaft 4, and the downstream side in the moving direction of the defoaming liquid (see FIG. 1 may be formed such that its inner diameter gradually increases as it goes downward.

  Each of the casings 21, 22 (22 a), 23 (23 a, 23 b) has a structure that does not rotate, and smoothly rotates the rotor 2, the upper hollow shaft 3, the lower hollow shaft 4, and the regulating plate 7. To provide the bearings 31 to 33 near the upper hollow shaft 3 and the upper end of the cylinder portion 5b of the rotor 2 and near the lower end of the lower hollow shaft 4, respectively, and to prevent leakage of liquid between the casings, Seal members 34 to 37 such as O-rings are provided.

Next, the operation of the centrifugal defoamer 1 according to the first embodiment will be described.
First, the system which processes undiluted | stock solution using the centrifugal defoamer 1 concerning this 1st Embodiment is demonstrated using FIG.1 and FIG.3. FIG. 3 is a system configuration diagram of the centrifugal defoamer 1 according to the first embodiment of the present invention. In addition, each operation | movement of the system which processes undiluted | stock solution using the centrifugal defoamer 1 is a control part (not shown) comprised so that operation | movement of each apparatus may be controlled based on the operation program previously memorize | stored in the memory | storage part not shown. It is controlled by.

  The stock solution for performing the defoaming process is accumulated in the stock solution tank 40. The stock solution from the stock solution tank 40 is sent by the pump 41 through the pipe 42 to the stock solution casing 22 of the centrifugal defoamer 1 according to the first embodiment. As described above, the stock solution fed into the stock solution casing 22 is sent into the defoaming chamber 2b of the rotor 2 and separated into the foam solution and the defoamed solution. The foam liquid separated from the stock solution is discharged to the outside of the centrifugal defoamer 1, and a part thereof is returned to the raw material tank 40 through the pipe 43. The remaining part is discharged. On the other hand, the defoamed liquid separated from the stock solution is discharged outside the centrifugal defoamer 1 through the pipe 44. Each pipe 42, 43, 44 is provided with a valve (not shown) for adjusting the amount of feed that passes through the pipe, and the air existing in the pipe is removed from the pipe 42 by centrifugal separation. An air vent valve (not shown) is provided so as not to be fed into the foam machine 1.

When the pump 41 is driven in the above system, the stock solution is supplied from the raw material tank 40 to the centrifugal defoamer 1. The discharge pressure of the pump 41 at this time is preferably adjusted to approximately 0.05 megapascal or less, although it depends on the specifications of the centrifugal defoamer 1.
When the stock solution comes out from the air vent valves 60 and 61 of the centrifugal defoamer 1 by supplying the stock solution from the raw material tank 40 to the centrifugal defoamer 1, each valve is closed and the rotation of the rotor 2 is started at a predetermined rotational speed. Let The number of rotations of the rotor 2 can be appropriately adjusted according to operating conditions such as the raw material and the specifications of the centrifugal defoamer 1.

The undiluted solution fed into the undiluted solution casing 22 as shown by an arrow 53 in FIG. 1 from a supply port (not shown) provided in the undiluted solution casing 22 through the pipe 42 passes through the undiluted solution passage 12 as shown by an arrow 54 in FIG. It is sent to the stock solution separation region X of the defoaming treatment chamber 2 b in the rotor 2. At this time, among the bubbles in the stock solution passing through the stock solution passage 12, large bubbles moved to the rotation axis A side of the stock solution passage 12 by the rotation of the rotor 2 are removed from the upper foam liquid removal provided in the upper hollow shaft 3. It is taken into the foam liquid passage 11 inside the upper hollow shaft 3 through the inlet 3b.
As described above, the stock solution sent to the stock solution separation region X of the defoaming treatment chamber 2b in the rotor 2 is rotated by the rotor 2 configured to be rotatable around the rotation axis A extending in the vertical direction. It receives the action of the centrifugal effect accompanying the rotation of the rotor 2, that is, centrifugal force.

  The centrifugal effect associated with the rotation of the rotor 2 is proportional to the inner diameter and the rotation speed of the rotor 2. For example, in the case of an apparatus in which the inner radius R of the rotor 2 is 0.1 m and the volume of the rotor 2 is 1.8 L, the rotation speed is set to about 1500 to 2200 rpm for a stock solution having a viscosity of 200 to 500 Pascal / second. A sufficient defoaming effect can be obtained by setting the treatment amount to 0.4 to 1.0 L / min. In the case of a stock solution having a viscosity of about 500 Pascal / second, a sufficient defoaming effect can be obtained by setting the rotational speed to 3500 rpm and the processing amount to about 0.32 to 1.0 L / min.

  In general, it is preferable to increase the rotational speed of the rotor 2 when the feed rate of the stock solution is increased, and it is effective to increase the rotational speed of the rotor 2 by reducing the feed rate when the viscosity of the stock solution increases. is there. In particular, the amount of feed greatly affects the defoaming process. In general, the rotational speed of the rotor 2 is desirably 800 rpm or more, and it is preferable to reduce the feed rate of the stock solution as the viscosity becomes higher.

  In addition, when the rubber | gum is used for the sealing members 22-26 of the centrifugal defoaming machine 1, the liquid temperature sent to the centrifugal defoaming machine 1 from the raw material tank 40 shall be a liquid temperature which does not change quality. preferable.

  In the stock solution separation region X, the stock solution that has received centrifugal force due to the rotation of the rotor 2 moves a liquid portion having a large specific gravity per unit volume toward the inner surface 2a of the peripheral wall of the rotor 2, and a bubble portion having a small specific gravity per unit volume. Moves to the rotation axis A side of the rotor 2. At this time, the stock solution supplied to the stock solution separation region X through the stock solution supply port 12a moves in the direction from the stock solution supply port 12a toward the regulating plate 7 (downward in FIG. 1), so that the stock solution and bubbles move in the moving direction. Differences occur. Therefore, since the moving directions of the stock solution and the bubbles are not balanced, the bubbles do not stay in the stock solution separation region X. Further, since the restriction plate 7 is provided so as to extend radially, most or all of the bubbles in the stock solution pass through the restriction plate 7 to the defoamed liquid recovery region Y below the stock solution separation region X. I can't move. Moreover, even if it moves to the defoaming collection | recovery area | region Y beyond the restriction | limiting board 7, as the surface 7b of the restriction | limiting board 7 goes to the outer peripheral part from the center part of the surface 7b located on the rotating shaft A, the cover part 5 Is formed so as to incline in the direction approaching (upward in FIG. 1), the bubbles in the stock solution do not stay in the defoaming recovery region Y, and the stock solution is separated when the rotation of the rotor 2 is slowed or stopped. Move to region X. In this way, the stock solution is completely separated into a foam solution and a defoam solution.

  Bubbles collected on the rotation axis A side in the stock solution separation region X are sent to the foam liquid casing 21 through the lower foam liquid intake port 3a and the foam liquid passage 11, and a discharge port (not shown) provided in the foam liquid casing 21. As a result, it is discharged to the outside of the centrifugal deaerator 1 as shown by an arrow 51 in FIG. On the other hand, the defoamed liquid that has moved to the outside region of the stock solution separation region X in the rotor 2 is pushed by the pressure of the stock solution that moves to the stock solution separation region X through the stock solution supply port 12a, and the regulating plate 7 and the rotor 2 moves to the defoaming liquid recovery area Y below the regulating plate 7 from the gap with the peripheral wall inner surface 2a, and degassed through the defoaming liquid intake 4a, the defoaming liquid outlet 4b and the defoaming liquid passage 13. It is fed into the foam liquid casing 23. And it is discharged | emitted outside the centrifugal defoamer 1 through the piping 44 from the discharge port not shown provided in the defoaming liquid casing 23.

  The centrifugal defoamer 1 according to the first embodiment is capable of defoaming a wide variety of stock solutions continuously from high viscosity to low viscosity by centrifugal separation operation in a complete sealed circuit under atmospheric pressure. Yes, especially suitable for defoaming of high viscosity liquid. Further, since the liquid is supplied and discharged in the vertical direction, degassing is easy and handling can be simplified. Further, since the hollow shafts 3 and 4 forming the passage have a single tube structure, they can be easily disassembled and assembled as compared with the double tube structure, and the number of parts can be reduced to realize a weight reduction. Furthermore, the tube diameter of the hollow shafts 3 and 4 can be increased to increase the defoaming amount.

  In addition, since the decompression device is unnecessary, the equipment cost can be reduced, the defoaming process can be efficiently performed with the equipment with a simple structure, and various liquids such as stock solutions containing volatile components such as solvents and fragrances. Processing is possible. Moreover, since it is an in-line continuous type, there are no various losses accompanying an operation stop, and a stock tank is unnecessary.

In addition, since the upper foam liquid inlet 3b is provided so as to connect the foam liquid passage 11 and the stock liquid path 12, large bubbles among the bubbles in the stock solution can be taken into the foam liquid passage 11 in advance. , Separation efficiency is higher than conventional.
Moreover, since the foam liquid casing 21, the stock solution casing 22, and the defoaming casing 23 are formed in a shape in which bubbles do not stay, it is possible to prevent the defoaming effect of the centrifugal defoamer 1 from being lowered.

  Furthermore, since the centrifugal separator uses a closed circuit, the scattering and collision of the liquid on the inner wall of the apparatus can be suppressed, so that bubbles are not regenerated and efficient defoaming can be performed in a short time. Further, since no shearing force is generated in the processing liquid, there is no adverse influence such as alteration on the processing liquid.

  Furthermore, because continuous processing is possible, the required amount can be processed when necessary, and the facility design that can effectively and flexibly respond to the required processing amount can be made, and the facility cost can be relatively reduced. Can do.

<< Second Embodiment >>
Hereinafter, a centrifugal defoamer 401 according to a second embodiment of the present invention will be described with reference to FIG.

  FIG. 4 is a cross-sectional view showing a configuration of a centrifugal deaerator 401 according to the second embodiment of the present invention. A centrifugal defoamer 401 according to the second embodiment of the present invention includes a medium foam liquid intake port 403c, which is an example of a third foam liquid intake port, instead of the upper foam liquid intake port 3b, and further guides. It differs from the centrifugal deaerator 1 of the first embodiment in that a plate 406 is provided. Since it is the same as that of the centrifugal defoamer 1 of 1st Embodiment in another point, the same referential mark is attached | subjected about the same component in an accompanying drawing, and the overlapping description is abbreviate | omitted.

In FIG. 4, the guide plate 406 is fixed to a position higher than the lower bubble liquid inlet 3 a of the upper hollow shaft 3 in the defoaming chamber 2 b of the rotor 2 and intersects the upper hollow shaft 3 (for example, an orthogonal direction). ) Having a radially extending surface, and the surface is formed so as to guide the stock solution to the outer region in the rotor 2, that is, the peripheral wall inner surface 2 a side of the rotor 2.
In addition, the guide plate 406 lengthens the path from the stock solution supply port 12a to the lower foam solution intake port 3a, and before the stock solution sent through the stock solution passage 12 is separated into the foam solution and the defoamed solution, It is provided so as not to move to the foam liquid passage 11 through the lower foam liquid intake port 3a.

As with the regulating plate 7, the guide plate 406 has an inner radius R of the rotor 2 and a radius r2 of the guide plate 406 according to the operating conditions such as the operating conditions and the properties of the stock solution to be defoamed, as shown in FIG. Can be appropriately modified so that the ratio is in the range of 10: 4 to 10: 9.
The radius r2 of the guide plate 406 is preferably smaller than the radius r1 of the regulating plate 7. With this configuration, bubbles in the stock solution pass between the outer peripheral portion of the guide plate 406 and the peripheral wall inner surface 2a of the rotor 2 and further move toward the lower foam liquid intake 3a side, and are regulated. It does not move beyond the plate 7 to the defoamed liquid recovery area Y.

  Further, as shown in FIG. 5, the guide plate 406 and the regulating plate 7 can be formed in a shape in which the outer peripheral portions 406a and 7c are inclined. Further, it may be conical. The inclination angles α and β are preferably approximately 30 to 150 degrees. In the second embodiment, since the bubbles in the stock solution are guided to flow along the lower surface of the guide plate 406 and the upper surface of the regulating plate 7, the guiding plate 406 and / or the regulating plate 7 are provided to be inclined. Thus, the contact area can be increased without increasing the radius r2 of the guide plate 406 and / or the radius r1 of the regulating plate 7, and the separation effect can be improved.

  The middle foam liquid inlet 403 c is formed in the defoaming chamber 2 b and higher than the guide plate 406 of the upper hollow shaft 3. The undiluted solution sent from the undiluted solution casing 22 through the undiluted solution passage 12 passes through the undiluted solution guide region X1 sandwiched between the lid 5 and the guide plate 406, and is separated into the undiluted solution sandwiched between the guide plate 406 and the regulating plate 7. It is supplied into the rotor 2 at a pressure that can move to the region X1. However, since the centrifugal force due to the rotation of the rotor 2 is also applied in the stock solution guide region X1, some bubbles in the stock solution cannot move to the stock solution separation region X2, but move to the rotation axis A side in the stock solution guide region X1. . The middle foam liquid inlet 403 c is formed to take in some of the bubbles into the foam liquid passage 11.

Next, the operation of the centrifugal deaerator 401 according to the second embodiment will be described.
Since the system which processes stock solution using the centrifugal defoamer 401 concerning this 2nd Embodiment is the same as the system which processes stock solution using the centrifugal defoamer 1 concerning 1st Embodiment shown in FIG. The overlapping description is omitted. Moreover, about the point which is the same as the operation | movement of the centrifugal deaerator 1 concerning this 1st Embodiment about the operation | movement of the centrifugal deaerator 401 concerning this 2nd Embodiment, the detailed description which overlaps is abbreviate | omitted.

  In the system for processing the stock solution using the centrifugal defoamer 401, when the pump 41 is driven, the stock solution is supplied from the raw material tank 40 to the centrifugal defoamer 401. When the stock solution comes out from the air vent valves 60 and 61 of the centrifugal defoamer 401 by supplying the stock solution from the raw material tank 40 to the centrifugal defoamer 401, each valve is closed and the rotation of the rotor 2 is started at a predetermined rotational speed. Let

The undiluted solution fed into the undiluted solution casing 22 as shown by an arrow 53 in FIG. 4 from a supply port (not shown) provided in the undiluted solution casing 22 through the pipe 42 passes through the undiluted solution passage 12 as shown by an arrow 54 in FIG. It is sent down to the defoaming treatment chamber 2 b in the rotor 2 and receives a centrifugal force due to the rotation of the rotor 2.
The stock solution sent to the defoaming treatment chamber 2b in the rotor 2 is first guided by the guide plate 406 and passes through the stock solution guide region X1. At this time, some bubbles in the stock solution that could not move to the stock solution separation region X2 due to the centrifugal force due to the rotation of the rotor 2 are collected on the rotation axis A side in the stock solution guide region X1, and the medium foam solution intake port 403c. Then, it is sent to the foamed liquid casing 21 through the foamed liquid passage 11 and is discharged to the outside of the centrifugal defoamer 401 as shown by an arrow 51 in FIG. 4 from a discharge port (not shown) provided in the foamed liquid casing 21.

  On the other hand, the undiluted solution guide region X1 moves to the outside region in the rotor 2 and the undiluted solution sent to the undiluted solution separation region X2 from between the peripheral wall inner surface 2a of the rotor 2 and the outer periphery 406a of the guide plate 406 Under the centrifugal force caused by the rotation, the liquid portion having a large specific gravity per unit volume moves to the peripheral wall inner surface 2 a side of the rotor 2, and the bubble portion having a small specific gravity per unit volume moves to the rotation axis A side of the rotor 2. At this time, the stock solution supplied from the stock solution guide region X1 to the stock solution separation region X2 through the stock solution supply port 12a moves in the direction from the guide plate 406 toward the regulating plate 7 (downward in FIG. 4). There is a difference in the direction of movement. Therefore, since the moving directions of the stock solution and the bubbles are not balanced, the bubbles do not stay in the stock solution separation region X2. Further, since the restriction plate 7 is provided so as to extend radially, most or all of the bubbles in the stock solution pass through the restriction plate 7 to the defoamed liquid recovery region Y below the stock solution separation region X2. I can't move. Moreover, even if it moves to the defoaming collection | recovery area | region Y beyond the restriction | limiting board 7, as the surface 7b of the restriction | limiting board 7 goes to the outer peripheral part from the center part of the surface 7b located on the rotating shaft A, the cover part 5 Is formed so as to incline in a direction approaching (upward in FIG. 4), bubbles in the stock solution do not stay in the defoaming recovery region Y, and the stock solution is separated when the rotation of the rotor 2 is slowed or stopped. Move to region X2. In this way, the stock solution is completely separated into the foam solution and the defoamed solution in the stock solution separation region X2.

  Bubbles collected on the rotating shaft A side in the stock solution separation region X2 are sent to the foam liquid casing 21 through the lower foam liquid intake port 3a and the foam liquid passage 11, and a discharge port (not shown) provided in the foam liquid casing 21. As a result, it is discharged to the outside of the centrifugal defoamer 401 as shown by an arrow 51 in FIG. On the other hand, the defoamed liquid that has moved to the outer region in the rotor 2 within the stock solution separation region X2 is pushed by the pressure of the stock solution that has moved from the stock solution separation region X1, and the regulating plate 7 and the inner surface 2a of the peripheral wall of the rotor 2 To the defoamed liquid recovery area Y on the lower side of the regulation plate 7 and sent to the defoamed liquid casing 23 through the defoamed liquid intake 4a, the defoamed liquid outlet 4b and the defoamed liquid passage 13. It is. Then, it is discharged to the outside of the centrifugal defoamer 401 through a pipe 44 from a discharge port (not shown) provided in the defoaming liquid casing 23.

The centrifugal defoamer 401 according to the second embodiment can obtain the same effects as the centrifugal defoamer 1 according to the first embodiment of the present invention by being configured and operating as described above.
In addition, the guide plate 406 lengthens the moving path for separating the stock solution, and the bubbles that could not move the stock solution guide region X1 to the inner surface 2a side of the peripheral wall of the rotor 2 can be discharged by the medium foam solution intake port 403c. Therefore, the separation efficiency is higher than conventional.

  As described above, according to the centrifugal defoamers 1 and 401 according to the first and second aspects of the present invention, it is possible to perform the defoaming process with high accuracy even for a highly viscous liquid that is not easily defoamed. Further, since the treatment is performed under atmospheric pressure and no shear force is applied to the stock solution, there is no adverse effect such as alteration on the treatment solution. In addition, the separation efficiency can be improved by eliminating the place where bubbles stay. Furthermore, since the hollow shaft has a single tube structure, it is easier to disassemble and assemble than the double tube structure, and the weight can be reduced by reducing the number of parts. Furthermore, the tube diameter of the hollow shaft can be increased to increase the defoaming amount.

The present invention is not limited to the above-described various embodiments, and can be implemented in various other modes. For example, in the second embodiment, the upper hollow shaft 3, the lower hollow shaft 4, the guide plate 406, and the regulating plate 7 are configured as separate members, but may be integrally formed.
Further, like the centrifugal deaerator 401 a shown in FIG. 6, the lower hollow shaft 4 and the rotor 2 may be configured integrally, or the upper end of the lower hollow shaft 4 may not be connected to the regulation plate 7.

  In the second embodiment, the guide plate 406 and the restriction plate 7 are attached to the upper hollow shaft 3, but may be attached to the peripheral wall inner surface 2 a of the rotor 2. In this case, the guide plate 406 is appropriately provided with an opening so that the stock solution in the outer region in the rotor 2 can move from the stock solution guide region X1 to the stock solution separation region X2, and the regulating plate 7 is separated in the stock solution separation region X2. An appropriate opening may be provided so that the defoamed liquid can move from the stock solution separation area X2 to the defoamed liquid collection area Y along the peripheral wall inner surface 2a of the rotor 2.

Moreover, in the said 1st and 2nd embodiment, although the centrifugal defoamer 1,401 was arrange | positioned so that the foam liquid casing 21 might be located upward and the defoaming liquid casing 23 was located below, Is not limited. For example, the centrifugal defoamers 1 and 401 may be tilted by 90 degrees from the state shown in the drawing, and the passages 11 to 13 may be arranged so as to be longer in the horizontal direction than in the vertical direction. Further, the centrifugal defoamers 1 and 401 may be rotated 180 degrees from the state shown in the drawing so that the vertical relations of the casings 21 to 23 and the rotor 2 are reversed.
In the first and second embodiments, in order to facilitate the assembly of the apparatus, in the drawing, the rotor 2 is constituted by two members, a bottomed cylindrical container portion and the lid portion 5. Although shown, it is not limited to this. For example, the bottom wall 2d may be a separate member. In this case, the lid 5 and the peripheral wall may be integrally formed.

  It is to be noted that, by appropriately combining arbitrary embodiments of the various embodiments described above, the effects possessed by them can be produced.

  The centrifugal defoamer according to the present invention eliminates the retention of bubbles in the rotor, and has an effect of separating various stock solutions into bubbles and liquids with high accuracy, in particular, chemical, pharmaceutical, papermaking, fiber, printing Centrifugal defoaming for continuous removal of bubbles mixed in liquids in industrial fields such as electronic materials and oil products, and in the manufacturing process of products such as cosmetics, foods, resins, paints, adhesives and sealants It is useful as a machine.

Sectional drawing which shows the structure of the centrifugal defoamer concerning 1st Embodiment of this invention. The elements on larger scale of the centrifugal deaerator concerning a 1st embodiment of the present invention. The system block diagram of the centrifugal defoamer concerning 1st Embodiment of this invention. Sectional drawing which shows the structure of the centrifugal defoamer concerning 2nd Embodiment of this invention. The partial enlarged view of the modification of the centrifugal defoamer concerning 2nd Embodiment of this invention. Sectional drawing which shows the structure of the modification of the centrifugal deaerator of this invention Sectional drawing which shows the structure of the conventional centrifugal deaerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,401 Centrifugal defoamer 2 Rotor 2a Circumferential wall inner surface 2b Defoaming treatment chamber 2c Resistance plate 2d Bottom wall 3 Upper hollow shaft 3a Lower foam liquid intake 3b Upper foam liquid intake 4 Lower hollow shaft 4a Defoamed liquid Intake port 4b Defoaming liquid outlet 5 Lid 5a Opening 5b Cylinder 7 Restricting plate 11 Foam liquid passage 12 Raw liquid path 12a Raw liquid supply port 13 Defoaming liquid path 21 Foam liquid casing 22 Raw liquid casing 23 Defoaming liquid casings 31 to 31 33 Bearing 34 to 37 Seal member 40 Stock solution tank 41 Pump 42 to 44 Piping 60, 61 Air vent valve 406 Guide plate

Claims (5)

A cylindrical box-shaped rotor configured to be rotatable about a rotation axis, and the bubbles are obtained by applying centrifugal force to the stock solution present in the defoaming treatment chamber in the rotor and containing bubbles. Is a centrifugal defoamer that performs a defoaming process that collects in the vicinity of the rotating shaft and separates the defoamed liquid after the process into the foamed liquid in which the bubbles are collected,
In the vicinity of the rotation axis of the rotor, it extends from the defoaming chamber to the outside of the defoaming chamber through an opening formed in the vicinity of the rotation shaft of the first end wall of the rotor. And a first liquid supply port that communicates with the defoaming chamber of the rotor is formed in a portion located in the defoaming chamber, with a stock solution supply port defined by an outer wall and the opening. A first hollow shaft having a foam liquid passage formed therein for allowing the foam liquid flowing from the first foam liquid intake port to flow to a portion located outside the defoaming treatment chamber;
In the defoaming treatment chamber, the first foam liquid intake port is provided so as to face the first end wall of the rotor, in a direction intersecting the first hollow shaft, and A regulating plate having a surface extending radially around the first hollow shaft,
The defoaming chamber passes the defoaming liquid that has passed between the outer end of the restriction plate and the peripheral wall of the rotor in the vicinity of the rotation shaft of the second end wall facing the restriction plate of the rotor. A centrifugal defoamer characterized in that a defoaming liquid discharge port for discharging to the outside is formed.   Further, on the defoaming liquid discharge port side of the restriction plate, the second end wall extends from the defoaming chamber of the rotor to the outside of the defoaming chamber on the same rotational axis as the first hollow shaft. The defoaming liquid intake port communicating with the defoaming treatment chamber is formed in the vicinity of the end portion on the side close to the regulating plate, and the defoaming liquid passes inside. The centrifugal defoamer according to claim 1, further comprising a second hollow shaft in which a defoaming liquid passage communicating with the defoaming liquid discharge port is formed. A cylinder portion is erected around the opening of the rotor, and a stock solution passage that guides the stock solution before defoaming to the stock solution supply port by the outer wall of the first hollow shaft and the inner wall of the cylinder portion. Is defined,
2. The second foam liquid intake port is provided on the outer wall of the first hollow shaft facing the cylinder portion, and the second liquid liquid intake port communicates the raw liquid passage and the foam liquid passage. The centrifugal defoamer according to claim 2. Furthermore, in the defoaming treatment chamber, the first hollow shaft is provided between a portion adjacent to the stock solution supply port and the first foam liquid intake port, and intersects the first hollow shaft. A guide plate having a surface extending in a direction and radially about the first hollow shaft;
In the defoaming treatment chamber, a third foam liquid intake port that communicates the defoaming treatment chamber and the foam liquid passage is provided at a position between the guide plate and the stock solution supply port. The centrifugal defoamer according to claim 1 or 2, characterized in that.   The regulating plate has a surface on the defoaming liquid discharge port side that extends from the center of the surface located on the rotation axis toward the outer periphery of the surface with respect to the direction orthogonal to the rotation axis. The centrifugal defoamer according to any one of claims 1 to 4, wherein the centrifugal defoamer is inclined in a direction approaching the first end wall of the rotor.

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