JPH0334244Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is applicable to paints, coating liquids, varnishes, nyamels, inks, adhesives, milk, edible liquids such as molasses, slurries, chemical liquids, liquid chemical products, and cooling water. Used to separate and remove air bubbles mixed in cleaning liquids, bleaching liquids, detergents, various waste liquids, sewage, fluids for air conditioning equipment, sponges, emulsions, latex, mineral oils such as lubricating oils and hydraulic oils, etc. In particular, the present invention relates to a bubble removal device that is effective in removing bubbles from a liquid with a large flow rate.

[Prior Art] When air bubbles are included in the various liquids mentioned above, these air bubbles can cause damage to equipment, erosion due to air ration and cavitation, noise,
It is necessary to separate and remove air bubbles from the liquid because they can cause product defects, such as non-coating on the coated surface due to air bubbles.

As shown in FIG. 3, a conventional bubble removing device has a cylindrical body a whose both ends are closed with lids b and c, and a flow for causing liquid discharged from a pump d to flow into the cylindrical body a. An inlet e is provided in the tangential direction, a liquid outlet f is provided at the center of the lid b at the other end of the cylindrical body a, and a gas outlet g is provided at the center of the lid c at one end of the cylindrical body a, The outlet f is connected to a liquid tank i or the like via an outlet pipe h, and the gas outlet g is connected to an air discharge pipe j with an on-off valve k.

In the above bubble removing device, when liquid containing air bubbles is supplied into the cylinder a by the pump d, the liquid flows at a predetermined flow rate from the inlet e opening in the tangential direction. A swirling flow follows the inner surface. This swirling flow is largest in the cylinder a near the inlet e due to the centrifugal force, and becomes smaller as it moves downstream to become an axial flow. The liquid flows out from the outlet f, and the centrifugal force Many air bubbles gather around the axis of the body. This is because the pressure generated at the axial center of the cylinder a has a pressure distribution where it is lowest near the inlet e, gradually increases downstream, reaches a maximum value, and then decreases, and this pressure distribution As a result, the bubbles gather at the axial center near the inlet e and form a gas column l at the axial center of the cylinder a. The collected bubbles are discharged to the outside from the gas outlet g.

The bubble removing device shown in FIG. 3 needs to be a cylinder with a small diameter in order to exhibit its performance, and as a result, it is forced to handle a small flow rate.

[Problem that the invention aims to solve] However, in recent years, there has been a need to remove air bubbles from the middle of piping that handles large flow rates of liquids, and this method, as shown in Figure 3, is used to remove air bubbles from pipes that handle large flow rates of liquids. In order to remove the air bubbles, it is necessary to increase the inflow velocity and inflow pressure of the liquid. This is because the discharge pressure of pump d for liquid supply should originally be extremely small.
This is contrary to the intention of transferring the liquid to the bubble removal device while avoiding dissolution of bubble gas into the liquid, bubble compression, cavitation and resulting erosion.

Furthermore, since the conventional bubble removing device shown in FIG. 3 cannot clean the inside of the cylinder a,
For example, when handling a liquid containing a viscous substance such as a coating liquid, there is a problem in that it is impossible to prevent troubles such as clogging of the cylinder a or the gas outlet g.

Therefore, the present invention aims to make it possible to efficiently remove bubbles from a large flow rate liquid without increasing the inflow pressure, and to facilitate cleaning.

[Means for Solving the Problems] The present invention consists of arranging a plurality of cylinders for collecting bubbles in the same direction, providing an inlet for liquid to flow in from the tangential direction at one end of each cylinder, and An inflow side casing to which liquid is supplied is provided around the outer periphery of the inflow side end of the cylindrical body, and a lower closing plate that is detachably attached to the inflow side casing and closes the inflow side end of each cylindrical body. In addition, the outflow side of each cylindrical body is formed by an outflow side casing and a closing plate detachably attached to the outflow side casing and connected to the downstream arrangement. A passageway is provided which opens into one outflow space formed by the cylinders and releases gas from the closed part on the inflow side of each of the cylindrical bodies. 0.05Kg for
The structure includes a resistor that provides a back pressure of f/cm ² or more.

[Operation] When liquid is allowed to flow in from the inlet opening tangentially at one end of each of the plurality of cylindrical bodies, microbubbles are gathered at the axial center of each cylindrical body due to the centrifugal force caused by the acceleration, and each of the above-mentioned By applying back pressure to the liquid outlet side of the cylindrical body, the collected bubbles are discharged from the cylindrical body through the gas outlet.

Furthermore, by removing the lower blocking plate from the inflow side casing, the inflow side space and the inside of each cylindrical body can be easily cleaned, and by removing the blocking plate from the outflow side casing, the inside of the outflow side space can be easily cleaned. I can do it.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a plurality (four in the drawing) of cylinders 2 for collecting bubbles are arranged side by side in the same direction, and one end of each cylinder 2 ( (lower end), one or more inlets 8 (two in the illustrated example) for allowing liquid to flow in from the tangential direction.
An inflow side casing 20 is provided on the outer periphery of the end on the inflow port 8 side of each of the cylindrical bodies 2, and the inflow side casing 20 is supplied with liquid from an inflow side piping 7, which will be described later.
One inflow side space 5 formed by a lower closing plate 4 which is detachably attached to the inlet casing 20 and which closes the inlet 8 side end of each cylindrical body 2 is provided. An inflow side pipe 7 for inflowing the liquid pumped by the liquid supply pump 6 is connected to the part, and the other end (upper end) of each cylindrical body 2 is connected to the outflow side casing 3 and the outflow side pipe 7. It opens into one outflow side space 9 formed by a closing plate 15 that is detachably attached to the side casing 3 and on which the downstream piping 17 is freshened, and passes through the inflow side piping 7 to the inflow side space. The liquid that has flowed into each cylindrical body 5 is supplied from the inlet 8 into each cylindrical body 2 to form a swirling flow and flow out from the upper end opening of each cylindrical body 2 to the outflow side space 9.

An air release side casing 21 is removably attached to the lower surface side of the lower blocking plate 4 to form an air release side space 10, and the axis of the air release side space 10 and each of the cylindrical bodies 2 is The air bubbles collected at the axial center by the swirling flow generated in each cylindrical body 2 are communicated with each other through gas vents 11 provided in the lower closing plate 4, and the air bubbles are transferred from each gas vent 11 to the air discharge side space. 10. A gas release port 12 is provided in the lower part of the air release side space 10, and the gas release port 12 is provided with a gas release port 12.
, a gas release pipe 1 having a gas release valve 14 in the middle
Connect 3. Furthermore, an orifice 16 may be incorporated into the blocking plate 15 attached to the outlet casing 3, the cross-sectional area of the downstream pipe 17 connected to the blocking plate 15 may be reduced, or an outlet throttle valve 18 may be installed in the pipe 17. A back pressure of 0.05 Kgf/cm ² or more is set so that the air bubbles separated in each cylindrical body 2 pass through the gas vent 11 and are discharged to the air discharge side space 10 by squeezing the air bubbles. I am trying to get it.

Note that the liquid moves from a swirling flow to an axial flow inside the cylinder 2 and moves downstream, but the pressure distribution that occurs at the axial center of each cylinder 2 due to this changes at the inlet 8.
The pressure distribution is lowest near the area, and gradually increases toward the downstream (upper part of the figure), reaches the highest value, and then decreases. Due to this pressure distribution, the air bubbles gather at the center of the axis near the inlet 8, and the air bubbles move toward the axis of the cylinder. A gas column is formed in the core. 19 is a pressure gauge.

Now, when a large amount of liquid discharged from the pump 6 flows into the inflow side space 5 from the inflow side piping 7, the liquid flows from there into the cylindrical body 2 through the inlet port 8 of each cylindrical body 2. The liquid flowing into each cylindrical body 2 collects bubbles at the axial center due to the centrifugal force caused by the swirling. In this case, the pressure distribution at the axial center of the cylindrical body 2 is lowest near the inlet 8, as described above, gradually increases toward the downstream, reaches a maximum value, and then decreases. , the bubbles are concentrated near the center axis of rotation and between the vicinity of the inlet 8 and the highest pressure position. The liquid from which bubbles have been separated in the cylindrical body 2 flows out from the downstream side (upper end side) of the cylindrical body 2 through a resistor such as an orifice 16, a small-diameter pipe 17, and an outflow-side throttle valve 18.

Due to the large centrifugal force caused by the rotation as described above, the inlet 8 side of the axial center of the cylindrical body 2 becomes negative pressure when there is no fluid load after the outflow side of the cylindrical body 2, and the lower blockage plate 4 Even if an attempt is made to release the aggregated air bubbles by providing a gas vent 11, the air bubbles cannot be released. Although the pressure at the center of the axis near the inlet 8 of the cylinder 2 varies depending on conditions such as the liquid inflow speed and the inner diameter of the cylinder, if the back pressure after the liquid outflow side is zero, the air bubbles will collect. This is because it cannot be discharged. For this reason, a resistor such as an orifice 16, a throttle valve 18, and a pipe 17 with a small cross-sectional area is connected after the outlet opening of the cylindrical body 2, and a back pressure of 0.05 Kgf/cm ² or more is applied.
Air bubbles are discharged from the gas outlet 11 to the air discharge side space 10. The above back pressure is independent of various conditions such as fluid viscosity, bubble diameter, cylinder size, etc.
Experience has shown that it should be 0.05 Kgf/cm ² or more. As means for checking the back pressure, there is a pressure gauge 19 on the inflow side.

The bubbles discharged into the air discharge side space 10 are discharged from the gas discharge port 12 via the discharge pipe 13.

Furthermore, since most of the outer circumferential portion of each cylindrical body 2 is exposed, it is possible to reduce contamination of the outer circumferential portion of each cylindrical body 2 with liquid, and also to prevent the closing plate 15, the air discharge side casing 21, and the lower closing plate 4 can be removed, the outflow side space 9, the air discharge side space 10, the inflow side space 5, and the inside of each cylindrical body 2 can be easily cleaned, which is extremely advantageous in terms of maintenance. .

In each of the above embodiments, each cylindrical body 2 is shown as a straight tube with the same diameter, but it may be tapered so that the diameter on the downstream side becomes larger. Further, resistors may be individually incorporated on the downstream side of a large number of cylindrical bodies. Furthermore, the individual cylindrical bodies do not necessarily have to have the same diameter.

[Effects of the invention] As described above, according to the bubble removing device of the present invention, an inlet is provided at each end of each cylinder for collecting bubbles to allow liquid to flow in from a tangential direction. providing one inflow side space surrounding the inflow side end of the cylindrical body, connecting an inflow side piping to the inflow side space, and opening the outflow side of each cylindrical body into one outflow side space; The liquid that entered the inlet side space flows into each cylinder from the inlet and becomes a swirling flow.
At this time, the centrifugal force causes the bubbles to concentrate at the axis of the swirling flow, and 0.05Kg is applied to the liquid outlet side.
By applying a back pressure of f/cm ² or more, the collected bubbles are pulled out from the center of the inlet shaft and released to the outside, so even a large flow of liquid is no different from a small flow of liquid. It is possible to efficiently remove air bubbles from the liquid without increasing the inflow pressure, and the collected air bubbles can be reliably released to the outside, resulting in a high-quality product without air bubbles.
It can produce excellent effects such as

Furthermore, according to the bubble removal device of the present invention, the lower closing plate is detachably attached to the inlet side casing and the outlet side casing is detachably attached, so that the inlet side space and the outlet side space are separated. The space and the inside of each cylindrical body can be easily cleaned, which is extremely advantageous in terms of maintenance, and troubles caused by adhesion of viscous substances contained in the liquid can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the device of the present invention, Fig. 2 is a sectional view taken from the direction of Fig. 1, and Fig. 3 is a sectional view showing an embodiment of the device of the present invention.
The figure is a schematic diagram of a conventional device. 2 is a cylindrical body, 5 is an inflow side space, 8 is an inflow port,
9 is an outflow side space, 10 is an air discharge side space, 11 is a gas outlet, 16 is an orifice, and 18 is an outflow side throttle valve.

Claims (1)

[Scope of utility model registration request] A plurality of cylindrical bodies for collecting bubbles are arranged side by side in the same direction, and an inlet is provided at one end of each cylinder to allow liquid to flow in from a tangential direction. One inflow side space formed by the supplied inflow side casing and a lower closing plate that is detachably attached to the inflow side casing and closes the inlet side end of each cylindrical body, and , the outflow side of each cylindrical body is opened to one outflow side space formed by an outflow side casing and a closing plate that is detachably attached to the outflow side casing and to which the downstream piping is connected. , provide a passage for releasing gas in the closed part on the inlet side of each of the cylinders, and apply a back pressure of 0.05 Kgf/cm ² or more to the flow rate on the downstream side of the liquid outlet space when the liquid passes through. A bubble removing device characterized by being provided with a resistor.