JP2001062203A - Defoamer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the defoaming effect while saving the space in a defoamer for reducing the pressure in a tank to defoam a liq. in the tank by providing a liq. feeder for dropping the liq. from a slit liq. supply port and a baffle for receiving the dropped liq. on its cylindrical circular side face and forming it into film. SOLUTION: A defoamer capable of being utilized even when the viscosity of a liq. 2 is widely varied is provided with a liq. feeder 3 for supplying the liq. 2 into a tank 1, the pressure in the tank 1 is reduced, and the liq. 2 is defoamed under the reduced pressure. The feeder 3 having the shape of an inverted T is furnished with a slit liq. supply port 6 at the lower tip of a liq. supply passage 5, and a semicircular-sectioned baffle 4 having a cylindrical circular side face 7 is provided under the port 6. Relating to the baffle 4, the liq. 2 dropped from the port 6 is received on the side face 7, formed into film and stored in the tank 1. Consequently, since the port 6 is shaped like a slit, the liq. 2 is extended into the film over the wide range of the side face 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defoaming device for defoaming an internal liquid by depressurizing the inside of the device.

[0002]

2. Description of the Related Art Conventionally, there has been known a device for defoaming a liquid in a tank by reducing the pressure inside a tank storing the liquid (Japanese Patent Laid-Open No. 63-269716). In the conventional apparatus, as shown in FIG. 6, a flat inclined plate 43 is provided below a liquid supply port 42 provided in an upper part of a tank 41, and a liquid 44 dropped from the liquid supply port 42 is Inclined plate 4
3 is stored in the tank 41 along the upper surface.

[0003]

In the conventional apparatus, in order to remove more air bubbles contained in the liquid, it is necessary to increase the space by increasing the number of the inclined plates. There is a need for a defoaming device that can enhance the defoaming effect even in a space.

In recent years, defoaming of various liquids has been used, and a defoaming apparatus that can be used even if the viscosity of the liquid is wide is desired.

[0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a defoaming apparatus which can improve the defoaming effect even in a small space.

Another object of the present invention is to provide a defoaming apparatus which can be used even when the viscosity of the liquid is wide.

[0007]

According to a first aspect of the present invention, there is provided a defoaming apparatus for defoaming a liquid inside a tank by depressurizing the inside of the tank, wherein a slit-shaped liquid supply port is provided in the tank. And a baffle plate below the slit-shaped liquid supply port for receiving the dropped liquid on a cylindrical arc-shaped side surface having a semicircular cross section to form a film. Features.

[0008] Since the bubbles contained in the liquid are extracted from the surface, if the surface area of the dropped liquid becomes large, the defoaming of the liquid can be performed quickly and efficiently. Due to the above, the liquid dropped from the slit-shaped liquid supply port spreads in a film shape on the cylindrical arc-shaped side surface, and its surface area increases. Since the liquid supply port of the defoaming device has a slit shape, the liquid can be spread in a film-like shape over a wide range of the cylindrical arc-shaped side surface. Therefore, the defoaming device can reduce the thickness of the liquid, increase the surface area of the liquid, and enhance the defoaming effect.

A defoaming device according to a second aspect of the present invention is a defoaming device for defoaming a liquid inside a tank by reducing the pressure inside the tank.
In the tank, there is provided a liquid supply device for dropping the liquid, and a baffle plate for receiving the dropped liquid to form a film, and the baffle plate is formed spirally along the inner wall of the tank. I do. As described above, the baffle plate is formed in a spiral shape along the inner wall of the tank, so that the liquid spreading over the baffle plate increases its surface area on the baffle plate. Can be transmitted. Therefore, in the defoaming device, the liquid is thinner than before and the surface area of the liquid can be increased, so that the defoaming effect can be enhanced.

A defoaming device according to claim 3 is a defoaming device for defoaming the liquid inside the vessel by reducing the pressure inside the tank.
It is characterized by comprising a liquid supply device for spraying a liquid on the inner wall of the tank above the liquid level of the tank, and means for rotating the inner wall of the tank in the horizontal direction around the center of the tank. As described above, the liquid that has spread on the inner wall of the tank and spreads like a film can be transmitted through the inner wall in a thin film state by increasing the surface area of the liquid because the inner wall is rotating. Therefore, the liquid is thinner, the surface area of the liquid can be increased, and the defoaming effect can be improved. Note that the expression that the center is used as an axis here means an axis that is a center of rotation, and does not necessarily indicate that an axis extending vertically at the center of the tank actually exists.

According to a fourth aspect of the present invention, there is provided the defoaming apparatus according to the third aspect, further comprising means for changing a horizontal rotation speed of the inner wall of the tank based on the viscosity of the liquid blown out from the liquid supply device. It is characterized by the following. As described above, the rotation speed can be changed so that the liquid having a high viscosity has a low speed and the liquid having a low viscosity has a higher speed.

A defoaming device according to claim 5 is a defoaming device for defoaming the liquid inside the vessel by reducing the pressure inside the tank.
A liquid supply device for spraying a liquid to the inner wall of the tank above the liquid level of the tank, and means for rotating the liquid supply device in a horizontal direction to move a portion of the inner wall to which the liquid is sprayed are provided. And As described above, the liquid blown out from the liquid supply device hits the inner wall of the tank and spreads in a film form, and the location of the inner wall to which the liquid is blown changes one after another. Can be transmitted through the inner wall. Therefore, the liquid is thinner,
The surface area of the liquid can be increased, and the defoaming effect can be improved.

According to a sixth aspect of the present invention, there is provided the defoaming apparatus according to the fifth aspect, further comprising means for changing the rotation speed of the liquid supply device based on the viscosity of the liquid blown out from the liquid supply port. I do. As described above, the rotation speed can be changed so that the liquid having a high viscosity has a low speed and the liquid having a low viscosity has a higher speed.

[0014]

FIG. 1 is a schematic sectional view showing an example of an embodiment corresponding to the first aspect of the present invention. As shown in FIG. 1, the defoaming apparatus includes a tank 1 and a liquid supply device 3 for supplying a liquid 2 (for example, a resin composition) into the tank 1. The inside of the tank 1 is set to a reduced pressure state, and the liquid 2 is defoamed under the reduced pressure. In the defoaming device, the liquid supply device 3 is provided as shown in FIG.
As shown in the figure, a slit-shaped liquid supply port 6 is provided at the lower end of the liquid supply path 5 in an inverted T shape. As shown in FIG. 1, the defoaming device includes a baffle plate 4 that receives the dropped liquid 2 on a cylindrical arc-shaped side surface 7 having a semicircular cross section below the slit-shaped liquid supply port 6. Have been. The liquid 2 that has fallen from the slit-shaped liquid supply port 6 spreads in a film shape on the cylindrical arc-shaped side surface 7 so that its surface area increases. Since the bubbles contained in the liquid 2 are extracted from the surface, if the surface area of the dropped liquid 2 becomes large, the defoaming of the liquid 2 can be performed quickly and efficiently. The baffle plate 4 receives the liquid 2 on the cylindrical arc-shaped side surface 7, and the liquid 2 is transmitted as a thin film on the cylindrical arc-shaped side surface 7 of the baffle plate 4 and stored in the tank 1. In the defoaming device, since the liquid supply port 6 has a slit shape, the liquid 2 can be spread in a film shape over a wide range of the cylindrical arc-shaped side surface 7. Therefore, the defoaming device is provided with the liquid 2
Is thinner and the surface area of the liquid 2 can be increased,
The defoaming effect can be improved even in a small space.

Hereinafter, only the points different from the defoaming device according to claim 1 will be described. FIG. 3 is a schematic sectional view showing an example of an embodiment according to the second aspect of the present invention. The defoaming device includes a baffle plate 12 formed in a spiral shape along an inner wall 11 of the tank 1 below a liquid supply device 13 provided at an upper portion of the tank 1. The liquid 2 that has dropped from the liquid supply device 11 is stored in the tank 1 while traveling along the baffle plate 12. Since the baffle plate 12 is formed in a spiral shape along the inner wall 11 of the tank 1, the liquid 2 spreading over the baffle plate 12 increases its surface area on the baffle plate 12 so that the spiral baffle 12 The plate 12 is transmitted as a thin film. Further, since the baffle plate 12 has a spiral shape, the space does not increase despite the continuous long distance. In the defoaming device, since the baffle plate 12 is formed in a spiral shape along the inner wall 11 of the tank 1, the liquid 2 can be thinner, the surface area of the liquid 2 can be increased, and the defoaming effect can be obtained even in a small space. Can be raised.

FIG. 4 is a schematic sectional view showing an example of an embodiment corresponding to the third and fourth aspects of the present invention. The defoaming device comprises a liquid supply device 21 for spraying a liquid onto an inner wall 11 of the tank 1 above a liquid surface of the tank 1, and means for rotating the inner wall 11 of the tank 1 in a horizontal direction about the center of the tank 1 as an axis. It is provided with.

The liquid supply device 21 has a supply pipe 24 penetrating the center of the upper surface 23 of the tank 1, and has a liquid supply port 25 at the end of the supply pipe 24 toward the inner wall 11 of the tank 1. . Further, a seal 22 is attached at a location where the supply pipe 24 passes through the upper surface 23 of the tank 1 so as to maintain the reduced pressure of the tank 1 and not to hinder the rotation of the tank 1. The liquid supply port 25 is configured so that the blown liquid 2 hits the inner wall 11 above the liquid level of the tank 1. The liquid 2 hitting the inner wall 11 spreads in a film form and increases its surface area. The defoaming device rotates the inner wall 11 of the tank 1 in a horizontal direction, and includes a rotating shaft 27 that supports the tank 1 at the center of the bottom 26 of the tank 1. This rotating shaft 27
Is connected to a pulley provided on the rotating shaft 27 by a belt 28.
Is attached, and when the belt 28 is moved by the driving device 30, the tank 1 is rotated. The liquid 2 that has spread on the inner wall 11 of the tank 1 and spreads in the form of a film travels on the inner wall 11 in a thin film state because the surface of the liquid 2 is increased because the tank 1 rotates. Therefore, the defoaming device can make the liquid 2 thinner and increase the surface area of the liquid 2, so that the defoaming effect can be improved even in a small space.

Further, in the defoaming device, the inner wall 11 is formed on the basis of the viscosity of the liquid 2 to be sprayed so that the liquid has a low viscosity and the liquid has a low viscosity, and the liquid has a low speed. It is desirable to vary the speed of rotation. When the horizontal rotation speed of the inner wall 11 of the tank 1 is changed based on the viscosity of the liquid blown out from the liquid supply device 21, the defoaming effect can be improved in a better state corresponding to the viscosity of a wide range of liquids. it can. The rotation speed may be set by measuring the viscosity of the target liquid 2 in advance.

FIG. 5 is a schematic sectional view showing an example of an embodiment corresponding to the fifth and sixth aspects of the present invention. The defoaming device includes a liquid supply unit 31 that sprays the liquid 2 on the inner wall 11 of the tank 1 above the liquid level of the tank 1, and an inner wall on which the liquid 2 is blown by rotating the liquid supply unit 31 in the horizontal direction. It is provided with means for moving eleven places.

The liquid supply device 31 has a supply pipe 34 penetrating through the center of the upper surface 33 of the tank 1, and has a liquid supply port 32 at the tip of the supply pipe 34 toward the inner wall 11 of the tank 1. .
The defoaming device is provided with a belt 35 on a pulley 39 provided on a supply pipe 34 near the upper surface 33 of the tank 1 outside the tank 1.
Is attached. This belt 35 is a driving device 40
, The supply pipe 34 rotates. When the supply pipe 34 rotates, the liquid supply device 31 rotates in the horizontal direction, and the rotation of the liquid supply device 31 causes the liquid supply port 32 at the end facing the inner wall 11 to move along the inner wall 11, The location of the inner wall 11 to which the liquid 2 is sprayed changes one after another. A seal 36 is attached at a location where the supply pipe 34 passes through the upper surface 33 of the tank 1 so as to maintain the reduced pressure of the tank 1 and not to hinder the rotation of the supply pipe 34. A supply distribution pipe 38 for supplying the liquid 2 from a tank or the like at another location to the supply pipe 34 and the supply pipe 3
A seal 37 is attached to the connection point 4 so as not to hinder the rotation of the supply pipe 34. Liquid supply port 3
The liquid 2 blown out from the tank 2 hits the inner wall 11 of the tank 1 and spreads in a film form, and the position of the inner wall 11 to which the liquid 2 is blown changes one after another.
It travels along the inner wall 11 in a thin film state. Therefore, the defoaming device can make the liquid 2 thinner and increase the surface area of the liquid 2, so that the defoaming effect can be improved even in a small space.

Further, in the defoaming apparatus, the supply pipe 34 is set so that, based on the viscosity of the liquid 2 to be sprayed, the speed becomes lower for a liquid having a high viscosity and the speed becomes higher for a liquid having a low viscosity. It is desirable to change the rotation speed of the rotation. If the horizontal rotation speed of the liquid supply device 31 is changed based on the viscosity of the liquid 2 blown out from the liquid supply port 32, the defoaming effect can be improved in a better state in accordance with the viscosity of a wide range of liquids. it can. The rotation speed may be set by measuring the viscosity of the target liquid 2 in advance.

[0022]

According to the first aspect of the present invention, the liquid supply port has a slit shape, and the liquid can be stretched into a film over a wide range of a cylindrical arc-shaped side surface having a semicircular cross section. Since the liquid can be made thinner and the surface area of the liquid can be increased, the defoaming effect can be improved even in a small space.

In the defoaming device according to the second aspect, the liquid spreading over the baffle plate is increased in surface area on the baffle plate, and the spiral baffle plate is transmitted as a thin film.
Since the baffle is helical, it does not increase the space despite the continuous long distance, so the liquid can be made thinner, the surface area of the liquid can be increased, and the defoaming effect can be improved even in a small space. it can.

In the defoaming device according to the third aspect, the liquid that has spread on the inner wall of the tank and spreads in the form of a film travels on the inner wall in a thin film state because the surface area of the liquid is increased because the tank 1 rotates. The liquid can be made thinner, the surface area of the liquid can be increased, and the defoaming effect can be improved even in a small space.

Furthermore, in the defoaming device according to the fourth aspect, in addition to the above-described effects, the rotational speed of the inner wall of the tank in the horizontal direction is changed based on the viscosity of the liquid blown out from the liquid supply device. The rotation speed can be changed so that the liquid with high viscosity becomes low speed and the liquid with low viscosity becomes high speed, so that the defoaming effect can be improved in accordance with the viscosity of a wide range of liquids. be able to.

In the defoaming device according to the fifth aspect, the liquid blown out from the liquid supply device hits the inner wall of the tank and spreads in a film form, and the position of the inner wall to which the liquid is blown changes one after another. Since it can be made larger and can be transmitted on the inner wall in a thin film state, the liquid can be made thinner, the surface area of the liquid can be increased, and the defoaming effect can be improved even in a space-saving state.

Furthermore, in the defoaming device according to the sixth aspect, in addition to the above-described effects, the rotational speed of the liquid supply device is changed based on the viscosity of the liquid blown out from the liquid supply port.
The rotation speed can be changed so that high-viscosity liquids have a low speed and low-viscosity liquids have a higher speed, so that the defoaming effect can be improved in accordance with the viscosity of a wide range of liquids. I can give it.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an embodiment of the invention according to claim 1 of the present invention.

FIG. 2 is a schematic sectional view showing the liquid supply device of FIG. 1;

FIG. 3 is a schematic sectional view showing an example of an embodiment of the present invention according to claim 2 of the present invention.

FIG. 4 is a schematic sectional view showing an example of an embodiment of the invention according to claims 3 and 4 of the present invention.

FIG. 5 is a schematic sectional view showing an example of an embodiment of the invention according to claims 5 and 6 of the present invention.

FIG. 6 is a schematic cross-sectional view showing an example of the prior art.

[Description of Signs] 1 tank 2 liquid 3,13,21,31 liquid supply device 4,12 baffle plate 5 liquid supply path 6,25,32 liquid supply port 11 inner wall 24,34 supply pipe

Claims (6)

[Claims] 1. A defoaming device for defoaming a liquid inside a tank by depressurizing the inside of the tank, a liquid supply device for dropping a liquid from a slit-shaped liquid supply port into the tank, A defoaming device characterized by comprising a baffle plate below the liquid supply port for receiving the dropped liquid on a cylindrical arc-shaped side surface having a semicircular cross section to form a film. 2. A defoaming apparatus for defoaming a liquid inside a tank by depressurizing the inside of the tank, a liquid supply device for dropping the liquid into the tank, and a baffle plate for receiving the dropped liquid to form a film. Wherein the baffle plate is spirally formed along the inner wall of the tank. 3. A defoaming apparatus for defoaming a liquid inside a tank by depressurizing the inside of the tank, comprising: a liquid supply device for spraying a liquid onto an inner wall of the tank above a liquid level of the tank; A defoaming device comprising means for rotating the tank in a horizontal direction about the center of the tank. 4. The defoaming apparatus according to claim 3, further comprising means for changing a horizontal rotation speed of an inner wall of the tank based on a viscosity of a liquid blown out from a liquid supply device. . 5. A defoaming apparatus for defoaming a liquid inside a tank by depressurizing the inside of the tank, comprising: a liquid supply device for spraying a liquid on an inner wall of the tank above a liquid level of the tank; A defoaming device comprising means for rotating in a horizontal direction to move a portion of an inner wall against which a liquid is blown. 6. The defoaming device according to claim 5, further comprising means for changing the rotation speed of the liquid supply device based on the viscosity of the liquid blown out from the liquid supply port.