JPH11333207A - Gas discharging in swirling flow type bubble removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of gas removal by opening a gas outlet, which is constituted so as to be openable/closable, from an inner cylinder to the outside when bubbles gather and grow around the inner cylinder. SOLUTION: This method is constituted so that a cylindrical body 1 to transport a liquid is formed, a pipe 5 for supplying the liquid is eccentrically connected with the side of the cylindrical body 1, an inner cylinder 2 is formed with a gas liquid separation membrane 7 which permeates only a gas on the shaft center part of the cylindrical body 1, and a gas permeated through the inner cylinder 2 is discharged to the outside of the cylindrical body 1. In this case, a gas outlet 10 is constituted so as to be openable/closable, and is opened when bubbles gather and grow around the inner cylinder 2. Thereby, the bubbles grow and form a bubble mass A to accelerate the absorption of the gas to the gas liquid separation membrane 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas discharging method for a swirling type bubble removing apparatus for removing gas contained in a liquid as bubbles, and more particularly to a gas discharging method for a swirling type bubble removing apparatus for improving gas removing efficiency. It is about the method.

[0002]

2. Description of the Related Art In the case where piping for transferring a liquid such as cooling water is laid in equipment such as space equipment or the like, when gas is generated or enters the liquid, bubbles are formed. Bubbles can clog the pump and hinder the operation of the pump. In a normal gravitational space, gas can be collected by providing a gas reservoir in a pipe, but in a non-gravitational space, bubbles are dispersed,
It cannot be collected easily.

[0003] Therefore, the present applicant first generates a swirling flow in a cylinder for transferring a liquid, moves bubbles having a specific gravity lower than that of the liquid to the axis by centrifugal force, and provides the bubbles at the axis. A swirling flow type bubble removing device as shown in FIG. 3 for discharging gas through an inner cylinder formed of a gas-liquid separation membrane has been proposed (Japanese Patent Application No. 5-81).
No. 70).

A gas-liquid separation membrane made of Teflon or the like is air-philic and water-repellent, and can transmit only gas but not liquid. If the pressure in the cylinder is higher than in the inner cylinder, the gas that has passed through the gas-liquid separation membrane will flow out into the inner cylinder. Gas removal is achieved by discharging gas from the inner cylinder.

[0005]

By the way, in the above-mentioned swirling flow type bubble removing apparatus, even if bubbles gather around the inner cylinder (that is, near the surface of the gas-liquid separation membrane), the bubbles are small. In some cases, the gas cannot adhere to the surface of the gas-liquid separation membrane due to surface tension and is not absorbed by the gas-liquid separation membrane. As shown in FIG. 4, air bubbles having a diameter of 1 mm or less are not absorbed by the gas-liquid separation membrane even when they come into contact with the surface of the gas-liquid separation membrane. When such small bubbles remain, the efficiency of gas removal from the liquid decreases.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a gas discharge method of a swirling flow type bubble removing device which enhances gas removing efficiency.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a cylinder for transferring a liquid is formed, and a liquid supply pipe is eccentrically connected to a side portion of the cylinder. A swirl-flow type bubble eliminator in which an inner cylinder is formed of a gas-liquid separation membrane that allows only gas to permeate the axis of the cylinder, and the gas permeating the inner cylinder is discharged to the outside of the cylinder. In the gas discharging method of the apparatus, a gas outlet from the inner cylinder to the outside is configured to be openable and closable, and the gas outlet is opened when bubbles gathered around the inner cylinder grow.

[0008] At least a part of the cylinder may be made transparent so that the periphery of the inner cylinder can be seen through.

A valve may be connected to the gas outlet, and the valve may be operated to open the gas outlet.

[0010]

An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

As shown in FIG. 1, the swirling type air bubble removing device is inserted and installed in a pipe for transferring a liquid such as cooling water to equipment such as space equipment. The swirling flow type bubble removing device includes a cylinder 1 and an inner cylinder 2 provided at an axial center of the cylinder 1. The cylindrical body 1 includes a substantially cylindrical side part 1a and closed both ends 1b and 1c, and can transfer the liquid in the axial direction. A ring-shaped member 3 is fitted on the upstream end side of the side portion 1a of the cylindrical body 1, and the cylindrical body 1
A liquid inlet 4 communicating with the inside is formed toward the tangential direction of the outer periphery of the cylindrical body, and a pipe 5 is connected to the liquid inlet 4. Therefore, this pipe 5 is connected eccentrically to the cylinder 1. On the other hand, the liquid outlet 6 is formed in the downstream end 1 b of the cylindrical body in the axial direction, and the liquid outlet 6 is connected to the pipe 5. With this configuration, the side 1 of the cylinder 1
The liquid flowing eccentrically from the position a is transported in the axial direction as a swirling flow.

The inner cylinder 2 extends in the axial direction from the upstream end 1c of the cylindrical body 1 toward the downstream end 1b by an appropriate length. The surface of the inner cylinder 2 is made of a gas-liquid separation membrane 7, and a skeletal member (see FIG. 2) for supporting the gas-liquid separation membrane 7 and keeping the inner cylinder in a cylindrical shape is provided inside the inner cylinder 2. I have. The skeletal member 8 has a plurality of rectangular plates 9 arranged such that the short sides are along the diameter of the inner cylinder 2 and the long sides are along the center and outer periphery of the inner cylinder 2. At the upstream end of the cylinder 1 is a gas outlet 1 directed in the axial direction.
0 is formed, and a part of the skeleton member 8 is
Has been inserted. The gas-liquid separation membrane 7 is tightly joined around the gas outlet 10 to seal the liquid.

The gas outlet 10 is configured to be openable and closable outside the cylinder 1. Specifically, as shown in FIG.
A valve 11 is connected to the gas outlet 10.
, The gas outlet 10 can be opened / closed. The outlet of the valve 11 is opened to the atmosphere (atmosphere in space equipment) or connected to a negative pressure air pipe.

In the swirling flow type bubble removing apparatus shown in FIG. 1, the side portion 1a of the cylindrical body is partially or entirely made of a transparent material such as resin such as acrylic or glass. This allows the inner cylinder 2 and its surroundings to be seen through from the outside of the cylinder 1. Therefore, for example, an optical device such as a monitoring camera, a light amount sensor, and an optical wavelength sensor can be installed outside the cylinder to observe or detect the growth state of bubbles.

The operation of the swirling type bubble removing apparatus will be described below.

Water eccentrically flowing in from the side portion 1a of the cylindrical body forms a swirling flow in the cylindrical body 1. The water flowing into the liquid inlet 4 from the pipe 5 may include air in the form of bubbles. The air bubbles collect around the axial center, that is, around the inner cylinder due to the centrifugal force acting on the swirling flow (see FIG. 3).

A plurality of bubbles B form a bubble group, and the individual bubbles B in the bubble group are successively fused to form a large bubble B. At the same time, there are many small bubbles B that do not fuse.
When these bubbles B touch the surface of the inner cylinder 2 made of the gas-liquid separation film 7, the air of the bubbles B passes through the gas-liquid separation film 7 and moves into the inner cylinder 2. That is, the bubbles B in the water are absorbed by the gas-liquid separation membrane 7. However, as described above, when the bubbles B are small, they may not be absorbed. When such small bubbles B remain, the efficiency of air removal is reduced. Therefore, in the present invention, the discharge of air is stopped until the bubble B grows. For example, the operator operates the valve 11 to close the gas outlet 10. This eliminates the discharge of air from the inner cylinder 2 to the outside, so that the pressure of the water in the cylinder 1 and the pressure of the air in the inner cylinder 2 are balanced, and the bubbles B pass through the gas-liquid separation membrane 7. Disappears. Therefore, as time passes, the number of bubbles B gathering around the inner cylinder 2 increases, so that the chances of a plurality of bubbles B being fused with each other increase, and the fused bubbles B further increase. By growing the bubbles B in this manner, a bubble mass A covering the periphery of the inner cylinder 2 is formed as shown in FIG.

The operator observes the periphery of the inner cylinder 2 from the transparent portion of the cylinder 1 and operates the valve 11 to open the gas outlet 10 when the formation of the bubble lump A (the growth of the bubble B) is confirmed. At this time, since the pressure of the air in the inner cylinder 2 is higher than the atmospheric pressure (the pressure of the atmosphere in the space equipment) or the negative pressure of the air pipe, the air in the inner cylinder 2 is discharged to the outside through the gas outlet 10. Will be. When the pressure of the air in the inner cylinder 2 decreases in this way, the pressure of the water in the cylinder 1 causes the bubble mass A
Is transmitted through the gas-liquid separation membrane 7. At this time, since the air does not exist in the form of the small bubbles B, such small bubbles B do not remain. Therefore, the air of the bubble lump A covering the periphery of the inner cylinder 2 is quickly absorbed by the gas-liquid separation membrane 7 and discharged to the outside via the gas outlet 10.

According to the method of the present invention, the gas outlet 10 is closed until the bubble B grows, and the gas outlet 10 is opened after the bubble B grows to absorb air in a batch process. Removal is not performed until B grows, but since the absorption rate during batch processing is very high, the gas outlet 1
The removal efficiency is higher than in the conventional method in which 0 is opened. This has been confirmed experimentally.

Although the operator confirms the growth of the bubble B and operates the valve 11, it is also possible to perform the operation unattended. For example, the presence of the bubble mass A may be detected by an optical device, and the valve 11 may be opened. When the cylindrical body 1 cannot be made transparent or when it is desired to omit the optical device, an appropriate opening / closing control time is set in advance by measuring the growth time of the bubble B, and the valve 11 is set in accordance with the setting.
The opening / closing operation may be time-controlled.

[0021]

The present invention exhibits the following excellent effects.

(1) Since the gas outlet is opened after the growth of bubbles, small bubbles do not remain, and as a result, gas removal efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a swirling flow type bubble removing apparatus showing an embodiment of the present invention.

FIG. 2 is a structural view of an inner cylinder of the swirling flow type bubble removing device of FIG.

FIG. 3 is a side sectional view of a conventional swirling type bubble removing device.

FIG. 4 is an enlarged view of the surface of a gas-liquid separation membrane and bubbles.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical body 2 Inner cylinder 4 Liquid inlet 5 Piping 6 Liquid outlet 7 Gas-liquid separation membrane 10 Gas outlet 11 Valve

Claims (3)

[Claims] 1. A cylinder for transferring a liquid is formed, and a liquid supply pipe is eccentrically connected to a side of the cylinder, and
A swirling air bubble removing device in which an inner cylinder is formed of a gas-liquid separation membrane that allows only gas to permeate the axis of the cylinder, and the gas permeating the inner cylinder is discharged to the outside of the cylinder. Wherein the gas outlet from the inner cylinder to the outside is configured to be openable and closable, and the gas outlet is opened when bubbles gathered around the inner cylinder grow. A gas discharge method of a swirling type bubble removing device. 2. The gas discharging method for a swirling type bubble removing apparatus according to claim 1, wherein at least a part of said cylindrical body is made transparent so that the periphery of said inner cylinder can be seen through. 3. The gas discharge of a swirling type bubble removing apparatus according to claim 1, wherein a valve is connected to the gas outlet, and the valve is operated to open the gas outlet. Method.