JP2001009206A - Multistage defoaming and degasing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defoaming and degasing device using dispersion disks and capable of enhancing the defoaming rate by enlarging the contact area of a treating liquid with a vacuum without making the device into large size as a whole. SOLUTION: In this device, the dispersion disks S (S1, S2) are supported to be rotated around a vertical rotating shaft 1 in a vacuum chamber C, the treating liquid supplied onto the disks S (S1, S2) rotating at high speed is dispersed by the action of centrifugal force and bubbles, or the like, in the liquid are defoamed and degased. The treating liquid is distributed and supplied to each of dispersion disks S (S1, S2) disposed to form multiple stages.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supplying a processing liquid onto a high-speed rotating dispersion plate provided in a vacuum chamber, and applying a centrifugal force to cause bubbles in the processing liquid and bubbles such as dissolved gas. The present invention relates to an apparatus for defoaming and degassing air.

[0002]

2. Description of the Related Art First, with reference to FIG. 10, a conventional defoaming / deaerator A 'having the above-described structure will be described. Inside the vacuum chamber C, a dispersion plate S is disposed horizontally, and the dispersion plate S has a vertical rotating shaft 1 driven by a motor M.
Is connected to the lower end. The dispersion board S has a configuration in which an annular screen plate 3 is attached to the outer peripheral edge of the disk body 2. A vacuum pump P ₁ is provided inside the vacuum chamber C.
Is maintained in a vacuum state or a state close to the vacuum state by the suction and exhaust action. Also, the top plate 4 of the vacuum chamber C
Through the processing solution supply pipe 5 inside the chamber C.
The processing liquid is continuously supplied to a portion near the center of the dispersion plate S by the supply pipe 5.

[0003] Then, in a state where the distributor S by a motor M is rotated at a high speed, continuous feed the processing liquid from the supply pipe 5 to the center of the disk body 2 of the distributor S by the pressure of the process liquid supply pump P ₂ Then, the processing liquid L that has dropped onto the disk body 2 is dispersed and thinned by the centrifugal force based on the high-speed rotation of the dispersion disk S, and the contact area (boundary area) with the vacuum is increased. Foam is promoted. The processing liquid L thinned by the dispersing action collides with the screen plate 3 of the dispersing disk S by centrifugal force, and then is scattered to the outside of the dispersing disk S through the mesh to be hit against the inner wall surface of the vacuum chamber C. As a result, the bubbles in the processing liquid L are destroyed, and are also defoamed by this action. Further, the processing liquid L struck against the inner wall surface of the vacuum chamber C is again thinned and defoamed while flowing down along the same, and is discharged from the discharge port 6 at the lower end of the vacuum chamber C. Note that in the vacuum chamber C and after defoaming, degassing treatment, the treated solution discharged from the discharge port 6 is transported by the treated fluid pump P ₃ to the next step.

As described above, in the defoaming / deaerator using the dispersing plate S, a plurality of actions are combined to remove bubbles in the processing liquid. The high value is due to the thinning of the processing liquid on the dispersion plate S based on the centrifugal force action. For this reason, when performing the defoaming treatment of the processing liquid at a constant flow rate, the larger the surface area of the dispersion plate S, the larger the contact area between the processing liquid and the vacuum, and the defoaming rate (this definition will be described later). Will be higher. In an apparatus having a single-stage dispersion plate, to increase the surface area of the dispersion plate,
There is no other choice but to increase the diameter of the dispersing plate. In this case, the apparatus is unnecessarily increased in size, and it has been attempted to increase the contact area between the processing liquid and the vacuum without increasing the size of the entire apparatus. Therefore, in order to increase the defoaming rate, the amount of processing per unit time must be reduced, and when the amount of processing per unit time is increased, there is a problem that the defoaming rate decreases.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a defoaming / degassing device having the above-described structure, in which the contact area between the processing liquid and the vacuum is increased without increasing the size of the entire device.

[0006]

In order to solve the above-mentioned problems, a means adopted in the present invention is as follows. A dispersing disk is supported in a vacuum chamber so as to be rotatable about a vertical rotation axis. In a device configured to disperse the processing liquid supplied on the plate by the action of centrifugal force and to defoam and deaerate bubbles in the liquid, the dispersing plates are arranged in multiple stages, and each dispersing plate is Distributing and supplying the processing liquid.

[0007] The dispersing plates are arranged in multiple stages on the same vertical rotation shaft, and the processing liquid distributed and supplied to each dispersing plate is thinned and defoamed independently in each dispersing plate.
For this reason, when the supply amount of the processing liquid is constant, the contact area between the thinned processing liquid and the vacuum is almost equal to the number of stages of the multi-stage dispersion plate, as compared with the case of the single-stage dispersion plate. Due to the expansion, defoaming is promoted (defoaming rate of the treated liquid is increased).
On the other hand, when obtaining a treated liquid with a constant defoaming rate, the supply amount of the processing liquid can be increased by almost the number of stages of the multi-stage dispersion plate, compared to the case of a single-stage dispersion plate, The efficiency of the defoaming treatment is significantly increased.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to embodiments.
Will be described in more detail. FIG. 1 shows a first embodiment of the present invention.
Degassing and degassing equipment A₁FIG. 2 is a front sectional view of FIG.
X of 1₁-X ₁It is a line sectional view. In addition, conventional defoaming and deaeration
The same parts as those of the air device A 'are denoted by the same reference numerals, and in this embodiment
Only the parts specific to the state will be described. 1 and 2
And the first and second dispersion boards S₁, S_TwoIs in the vertical direction
The first and second distribution boards S are arranged at regular intervals.
₁, S_TwoAre connected at two opposing locations of the disk 2.
They are integrally connected by a unit 7.

Further, the lower end of the vertical rotating shaft 1 is integrally connected to the center of the disk 2 of the first dispersing disk S ₁ disposed below, and the second dispersing disk S ₂ disposed above. Disc 2
Is provided with a circular center hole 8. In addition, a hollow donut-shaped distribution container 9 for temporarily storing and distributing the processing liquid L is integrally connected to the supply pipe 5 for the processing liquid L inserted into the vacuum chamber C. vessel 9 is disposed directly above the second distributor S _2, vertical shaft 1 is inserted into the central hole 11. The distribution container 9 is fixed to the casing (not shown) of the motor M or the top plate 4 of the vacuum chamber C. On the lower surface of the distribution container 9, a pair of first distribution and supply pipes 12 and a pair of second distribution and supply pipes 13 are also provided with their own central holes 11.
Are symmetrically disposed with respect to each other and extend downward. Lower ends of the pair of first dispensing pipe 12 is reached in the center of the first distributor S _1, the lower end portions of the pair of second dispensing pipe 13, the center of the second distributor S ₂ holes 8
Has reached the part facing.

For this reason, when the vertical rotation shaft 1 is rotated at a high speed by the motor M, the first and second dispersion disks S ₁ , S _1
2 rotates together. In this state, when the processing liquid is supplied through the supply pipe 5 by the action of the processing liquid supply pump P ₂ , the processing liquid is once stored in the distribution container 9, and then is stored in the first and second distribution supply pipes. 12 and 13 respectively, and are distributed and supplied to the first and second dispersion boards S ₁ and S ₂ . Each of the processing liquids distributed and supplied onto the first and second dispersing plates S ₁ and S ₂ is independently subjected to a dispersing action by centrifugal force to be thinned, and then collides with the screen plate 3. Then, it is scattered outside through the mesh and hit against the inner wall surface of the vacuum chamber C, and flows down along the inner wall surface.

That is, in the defoaming / degassing apparatus A ₁ of the present embodiment, the first and second dispersing plates S ₁ and S _{2 of} upper and lower two stages are used.
The processing solution is distributed and supplied to each of them, and each of them is independently thinned, so that the contact area between the thinned processing solution on each of the dispersion plates S ₁ and S ₂ and the vacuum is a single-stage dispersion plate. Compared to
It is almost doubled. Therefore, when the processing liquid flow rates are the same, the two-stage dispersion plate has a higher defoaming rate of the processing liquid than the single-stage dispersion plate. In particular, in the present embodiment, each distributor S _1, S _2, at two locations symmetrically with respect to its center of rotation, for the treatment liquid is supplied uniformly, each distributor S _1, S ₂ above In this case, the processing liquid is easily thinned uniformly, and the defoaming rate of the processing liquid is somewhat increased by this processing liquid supply method.

FIG. 3 and FIG. 4 show two-stage dispersion boards S ₁ ,
Defoaming and deaerator A of the second embodiment of the present invention equipped with S _2
2 is shown. The defoaming-deaerator A _2, only the configuration of the dispensing container 14 of the treatment liquid L is provided separately from the supply pipe 5 is different from the defoaming-deaerator A _1. That is,
Dispensing container 14 is disposed at a position shifted from the center of the second distributor S _2, the motor M of the casing (not shown) or be fixed to the top plate 4 of the vacuum chamber C, and a lower surface, each of the first and second distributor S _1, S each of the first and second dispensing pipe 15, 16 for supplying ₂ to the treatment liquid
Are provided respectively. First distribution supply pipe 15
The processing liquid is supplied to a portion close to the center of the first dispersion plate S ₁ , and the processing liquid is supplied from the second distribution supply pipe 16 to a portion of the second dispersion plate S ₂ facing the center hole 8. .

In the defoaming / deaerator A ₂ , the processing liquid is once supplied and stored in the distribution container 14 through the supply pipe 5 by the operation of the processing liquid supply pump P ₂ , and the first and second processing liquids are supplied. Is distributed and supplied to each of the dispersing boards S ₁ and S ₂ ,
It is thinned.

Next, defoaming and deaeration according to a third embodiment of the present invention.
Device A_ThreeWill be described. This defoaming / deaerator A
_ThreeIs the defoaming / deaerator A₁Of two-stage disperser into three stages
It was done. FIG. 5 shows a defoaming / deaerator A._ThreeFrontal view of
FIG. 6 is a plan view of each dispersion board S. ₁~ S_ThreeAnd distribution container 2
FIG. 3 is a perspective view of a state in which the device 3 and 3 are separated. 1st to 3rd minute
Scatter S₁~ S_ThreeAre arranged one above the other at a predetermined interval.
A pair of links at two opposite locations of each disk 2
They are integrally connected via a connection 21.

Further, a first dispersion plate S ₁ arranged at the lowermost stage
At the center of the disk body 2, the lower end of the vertical shaft 1 is integrally connected to, the central part of the second distributor S ₂ arranged in the middle, a circular center hole 8 is provided, further At the center of the third distributor S ₃ disposed at the top, a large central hole 22 of the inner diameter is provided than the center hole 8. A hollow donut-shaped distribution container 23 for temporarily storing the processing liquid L is integrally connected to a distal end of the supply pipe 5 for the processing liquid L inserted into the vacuum chamber C. Dispensing container 23 in a state where the vertical shaft 1 to the center hole 24 provided at the center thereof is inserted, and is fixedly disposed directly above the center of the third distributor S _3.

On the lower surface of the distribution container 23, first to third distribution supply pipes 25, 26, 27 are respectively provided to extend downward at a symmetrical position with respect to the center of the distribution container 23. ing. The lower end portion of the first dispensing pipe 25 is reached first central distributor S ₁ the lowermost, the lower end portion of the second dispensing pipe 26, the central hole in the second distributor S ₂ of the intermediate 8 and a third distribution supply pipe 27
The lower end portion, a center hole 2 in the third distributor S ₃ of the uppermost
The part facing 2 is reached. In addition, a pair of first distribution and supply pipes 25 is inserted through the center hole 8 of the second distribution board S ₂ , and a pair of first distribution and supply pipes 25 is inserted into the center hole 22 of the third dispersion board S _3. And the second distribution / supply pipe 26 are respectively inserted therethrough.

Therefore, each of the first to third dispersion boards S _{1 to} S ₃
Are rotating together, the processing liquid supplied to the supply pipe 5 by the action of the processing liquid supply pump P ₂ is transferred from each distribution supply pipe 25, 26, 27 of the distribution container 23 to each dispersion board. When distributed to S _{1 to} S ₃ , each dispersion board S ₁
Each of the processing liquids distributed to and supplied to ＳS ₃ is formed into a thin film on the upper surface of each of the dispersion boards S _{1 to} S ₃ and defoamed.
Thus, in the defoaming-deaerator A ₃ of the third embodiment, the contact area between the thinned treatment liquid and the vacuum on the distributor S ₁ to S ₃ is the distributor of the single-stage In comparison, it is almost three times. For this reason, when the processing liquid flow rates are the same, the three-stage dispersion plate has a higher defoaming rate of the processing liquid than the two-stage dispersion plate.

Further, the structure of the dispersion plate itself is not limited to the structure in which the annular screen plate 3 is provided only on the outer peripheral edge of the disk body 2 as in the above embodiment. FIG.
Has a structure in which a plurality of annular screen plates 3a, 3b, 3c having different sizes are provided on a disk body 2, and is used for a processing liquid having a high viscosity and difficult to remove bubbles. And the screen plates 3a, 3b, 3c
Because there are many chances of collision with the air, the defoaming effect is enhanced. Further, the dispersing disk S "shown in FIG. 8 has a pair of disks 2a and 2b arranged one above the other, and the disks 2a and 2b
A plurality of annular inclined walls 31a and 31b having different sizes are provided on the opposing surface (inner surface) of the pair b.
The processing liquid supplied during 2b collides with the inclined walls 31a and 31b by the action of the centrifugal force, and then is defoamed while climbing over and scattered outward. This dispersion board S "
Is suitable for a slurry liquid or a processing liquid containing fibrous materials because it has no screen plate and thus does not clog. The dispersing plate used in the multistage defoaming / deaerator according to the present invention may be any structure including the above-mentioned structure as long as the processing liquid can be thinned and defoamed by the action of centrifugal force. There may be.

Examples of the liquid that can be defoamed by the defoaming / deaerator according to the present invention include water-based architectural paints, urethane resin liquids, chemical liquids such as mud, beverages such as concentrated juices, mayonnaise, and ketchup. Food supplements.

The results of the performance comparison test of each defoaming / deaerator using the multi-stage disperser and the single-stage disperser are shown below. Here, when the defoaming rate is (K) and the air volume in the liquid before and after the treatment is (v ₁ ) and (v ₂ ), respectively, “K =
[1− (v ₂ / v ₁ )] × 100 ”holds.

In the performance comparison test, [true specific gravity:
ρ], [specific gravity before defoaming: ρ ₁ ], [specific gravity after defoaming: ρ ₂ ],
[Liquid volume: V], [air volume before defoaming: v ₁ ],
When [volume of air contained after defoaming: v ₂ ], ρV = ρ ₁ ×
(V + v ₁ ) and [v ₁ = V × (ρ−ρ ₁ ) /
ρ]. Also, ρV = ρ ₂ × (V + v ₂ ), and [v ₂ = V × (ρ−ρ ₂ ) / ρ]. As a result, the change (v ₂ / v ₁ ) in the air volume contained in the liquid before and after the treatment is [ρ ₁ (ρ−ρ ₂ ) / ρ ₂ (ρ−ρ
₁ )], and substituting this value into the above-described formula for the defoaming rate, the defoaming rate is calculated.

Here, when a building paint (acrylate ester) having a liquid temperature of 21 ° and a viscosity of 15,000 cp is used as a treatment liquid and the dispersion plate is rotated at 2300 rpm in a vacuum chamber having a degree of vacuum of 40 Torr, Each defoaming rate with respect to the flow rate of the processing liquid in the single-stage disperser and the two-stage disperser was determined. Tables 1 and 2 show the experimental results of the single-stage dispersion plate and the two-stage dispersion plate, respectively. FIG. The state of change of the foam ratio is shown. Based on the experimental results, the two-stage dispersion plate has a larger contact area between the thinned processing solution and vacuum than the single-stage dispersion plate, so the defoaming rate is independent of the processing solution flow rate. It was found that when the flow rate of the treatment liquid increased, the degree of the defoaming rate increased.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

According to the present invention, a dispersion plate is supported in a vacuum chamber so as to be rotatable about a vertical rotation axis, and the processing liquid supplied onto the dispersion plate during high-speed rotation is dispersed by the action of centrifugal force. In the apparatus configured to defoam and deaerate bubbles in the liquid, the dispersing plates are arranged in multiple stages, and the processing liquid is distributed and supplied to each dispersing plate. The processing liquid distributed and supplied is thinned and defoamed independently in each dispersing plate. For this reason, when the supply amount of the processing liquid is constant, compared with the case of the single-stage dispersion plate,
Since the contact area between the thinned processing solution and vacuum is increased by almost the number of stages of the multi-stage dispersion plate, defoaming is promoted,
The defoaming rate of the treated liquid increases. On the other hand, when a treated liquid having a constant defoaming rate is obtained, compared with a single-stage dispersion plate,
Since the supply amount of the processing liquid can be increased by approximately the number of stages of the multi-stage dispersion plate, the efficiency of the defoaming treatment is significantly improved.

As described above, according to the present invention, the contact area between the processing solution and the vacuum can be increased without increasing the size of the entire defoaming / deaerator, and the defoaming rate of the processing solution can be increased. Or the flow rate of the processing solution itself can be increased.

[Brief description of the drawings]

1 is a front sectional view of a defoaming-degassing device A ₁ of the first embodiment of the present invention.

FIG. 2 is a sectional view taken along line X ₁ -X ₁ of FIG. 1;

FIG. 3 is a front sectional view of a defoaming / deaerator A2 according to a _second embodiment of the present invention.

FIG. 4 is a sectional view taken along line X ₂ -X _{2 in} FIG. 3;

FIG. 5 is a front sectional view of a defoaming / deaerator A3 according to a _third embodiment of the present invention.

6 is a perspective view of a separated state with each distributor S ₁ to S ₃ of the defoaming-deaerator A ₃ and dispensing container 23.

FIG. 7 is a sectional view of a dispersion board S ′.

FIG. 8 is a sectional view of a dispersion board S ″.

FIG. 9 is a graph showing a relationship between a processing liquid flow rate and a defoaming rate in a single-stage dispersion plate and a two-stage dispersion plate.

FIG. 10 is a front sectional view of a conventional defoaming / deaerator A ′.

[Explanation of symbols]

C: Vacuum chamber S _1: first distributor S _2: second distributor S _3: third distributor L: treatment liquid 1: the vertical shaft 8, 22: distributor of the central hole 9,14,23: distribution Containers 12,13,15,16,25,26,27: Distribution supply pipe

Continued on the front page (72) Inventor Hisayasu Tachikawa No. 1-336, Noritake Shinmachi, Nishi-ku, Nagoya City, Aichi Prefecture Inside Noritake Company Limited (72) Inventor Makoto Kida 3-1-1, Noritake Shinmachi, Nishi-ku, Nagoya City, Aichi Prefecture Noritake Co., Ltd. (72) Inventor Shoichi Shimomura 3-36, Noritakeshinmachi, Nishi-ku, Nagoya-shi, Aichi F-term in Noritake Co., Ltd. 4D011 AA06 AA16 AB01 AB02 AB05 AC02 AD01 BA07 BA12

Claims (4)

[Claims] A dispersion plate is supported in a vacuum chamber so as to be rotatable about a vertical axis, and a processing liquid supplied onto the dispersion plate during high-speed rotation is dispersed by the action of centrifugal force. An apparatus having a structure for defoaming and degassing air bubbles, wherein the dispersing plates are arranged in multiple stages, and a processing liquid is distributed and supplied to each dispersing plate. 2. A distribution supply pipe for distributing and supplying a processing liquid to each of the dispersing plates, wherein each of the distributing and supplying tubes is inserted through a center hole provided in a central portion of the dispersing plate except for a lowermost dispersing plate. Item 2. A multi-stage defoaming / deaerator according to Item 1. 3. A distribution supply pipe for supplying a processing liquid to each dispersing plate is branched from a sealed distribution container arranged in a vacuum chamber for temporarily storing the processing liquid, and the processing liquid is The multi-stage defoaming / deaerator according to claim 1 or 2, which is supplied in a discharge state by a pump pressure. 4. The multistage defoaming device according to claim 1, wherein the processing liquid is uniformly supplied to each of the dispersing plates from two positions symmetrical with respect to the center of rotation. -Degassing device.