JP2749880B2 - Device for removing gas from liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for removing a gas contained in a liquid from a liquid even in a microgravity environment such as for space use related equipment. Related to the device.

[Conventional technology]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a method of separating air bubbles from a liquid by using the effect of gravity and separating gas in the liquid is generally used for ground equipment.

That is, the fluid containing the air bubbles K
By introducing the gas into the inside 21 and lowering the average flow velocity to achieve a condition in which the buoyancy 22 is dominant as a force applied to the bubble K, the bubble K is raised, and conversely, the separated liquid J is moved downward.
Move to 23 to perform bubble separation.

As a result, the bubble K and the liquid are separated, and the liquid J from which the bubble has been separated is taken out from the lower outlet portion 25 in the direction shown by the arrow, and the gas in the bubble K that has risen is taken out from the upper outlet portion 26. The gas contained in the liquid can be separated from the liquid with a simple structure.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional separation device, due to the separation action by gravity, that is, due to the difference in specific gravity between the liquid and the bubble,
Since the gas in the liquid is separated by using the buoyancy generated in the bubbles, the action of gravity cannot be used in a microgravity environment such as outer space. Can not.

For this reason, the present invention is an apparatus that can efficiently remove gas contained in a liquid without using gravity and can separate gas in a liquid even in space where there is almost no effect of gravity. It is intended to provide.

[Means for solving the problem]

The device for removing gas in a liquid of the present invention separates air bubbles contained in the liquid flowing in the flow path from the liquid by interfacial tension, causes the liquid to adhere, and, by the dynamic pressure of the liquid,
The adhering air bubbles are pushed out to the downstream side of the flow path to be accumulated, and the perforated plate arranged in the flow path and the accumulated air bubbles are sucked, and only the gas of the gas-liquid mixture is selectively selected. And a gas discharge device that allows only the gas of the accumulated bubbles to pass through the flow path by allowing the gas to pass through the gas selective permeable membrane.

(Operation)

In the present invention, the bubbles contained in the liquid come into contact with the perforated plate provided in the flow path through which the fluid flows, and the adhesive force (interfacial tension) thereof
The bubbles selectively adhere to the perforated plate.

On the other hand, the liquid passes through the perforated plate to separate bubbles and liquid. By discharging only the gas component of the bubbles separated in this way from the flow path, in the present invention, the gas and the liquid are separated irrespective of the action of gravity, and the gas is separated even in a zero gravity or microgravity environment. And liquid can be separated.

In addition, the perforated plate is separated from the liquid, and the attached bubbles are pushed out by the dynamic pressure of the liquid toward the downstream side of the flow path so that the bubbles adhered to the perforated plate flow to the downstream side of the flow path. Since it is formed so as to be integrated and arranged in the flow path, bubbles separated from the liquid form a bubble mass on the flow path inner wall portion connected to the most downstream side of the perforated plate. .

Further, a gas selective permeable membrane which selectively permeates only the gas in the bubble mass of the gas-liquid mixture and forms a part of the gas discharge device is provided on the inner wall of the flow channel where the bubble mass is formed. By applying a suction force to the gas selective permeable membrane by the gas discharge device, only the gas in the bubble mass can be easily suctioned from the inside of the flow path by the gas discharge device, and the gas is separated. Only the gas among the bubbles can be discharged out of the flow path.

In most parts other than the part where the bubble mass is formed on the perforated plate, the liquid and the bubble are separated, and depending on the gas discharge device, only the gas is separated from the bubble mass and discharged to the outside of the flow path. Therefore, the liquid is sent downstream in the flow path with the gas removed.

Embodiment An embodiment of the present invention is shown in FIG.

The container 1 forming a flow path through which the fluid 2 containing the air bubbles K flows is formed in a cylindrical body having a circular cross section, and the central portion bulges to form a large diameter portion 1b, and the liquid 2 is formed at the upper and lower ends. Entrance 1a
And an outlet 1c.

In the large diameter portion 1b of the container 1, a mesh 3 as a conical perforated plate having a vertex 3a on the upstream side of the flow of the liquid 2 and extending obliquely to the downstream side is disposed. Rim 3b
Is attached to the inner wall on the downstream side of the large-diameter portion 1b of the container 1, and the mesh 3 is disposed so as to cross the large-diameter portion of the container 1 which is a liquid flow path.

The large-diameter portion 1b of the container 1 is in contact with the lower edge 3b of the mesh 3 and has a plurality of or circumferentially continuous holes 1d upstream thereof.
Is provided, and has a gas outlet 9a on the side connected to a decompression source such as a vacuum pump or an ejector, and a gas discharge device including an annular gas absorption duct 9 arranged so as to surround the hole 1d. It is attached to the outside of the large diameter portion 1b of the container 1.

Further, the plurality of holes 1d can selectively transmit only a gas of a gas mixture such as Gore-Tex, which is a gas selective permeable membrane 10 constituting a part of a gas discharge device.
Is installed.

The size of the opening of the mesh 3 is set such that bubbles in the liquid 2 adhere to the mesh 3 due to surface tension without passing even by the dynamic pressure of the liquid 2 and only the liquid can pass through the mesh 3. I have.

In the present embodiment configured as described above, the liquid 2 containing the bubbles K is introduced into the container 1 from the upper inlet 1a as shown by the arrow.

When the liquid 2 passes through the mesh 3 in the container 1 as shown by an arrow 4, bubbles K contained in the liquid 2 adhere to the mesh 3 due to surface tension and do not pass through the mesh 3. 2 is separated into a bubble K and a liquid J, and the liquid J from which the bubble K has been separated flows as shown by an arrow 8 and is discharged from the lower outlet 1c.

On the other hand, since the mesh 3 has a conical shape, and its vertex 3a is on the upstream side of the flow of the liquid 2 and its side surface is inclined to the downstream side, the air bubbles K collected by the mesh 3 are separated by the flowing liquid. Due to the dynamic pressure of 2, as shown by arrow 6, the mesh 3 is pushed downstream and outward along the side surface, and
It flows to the downstream side so as to be extruded toward the inner peripheral side of the large diameter portion 1b of the container 1, and the upstream side mesh 3 of the lower edge 3b of the mesh 3 and the gas selective permeable membrane 10 provided in the large diameter portion 1b. A bubble lump 7 is formed between them.

As described above, this bubble lump 7 selectively permeates only the gas in the gas mixture and passes through the gas selective permeable membrane 10 which constitutes a part of the gas discharge device. The gas is taken out to the gas absorption duct 9 constituting the device, and only the gas in the liquid 2 is discharged from the gas outlet 9a as shown by the arrow 11.

In this way, the mesh 3
Although the bubbles are pushed downstream and outward along the side surface of, and the bubbles accumulate, the generation of the large-volume bubble mass 7 is suppressed, so that the mesh 3 for separating the bubbles K and the liquid 2 from the liquid 2 Is sufficiently secured.

As described above, in the present embodiment, the separation between the gas and the liquid 2 is performed not by gravity, but by adhesion of the bubbles K to the mesh 3 by surface tension of the bubbles K. The gas can be separated from the liquid 2.

Further, the bubbles K collected by the mesh 3 are pushed downstream along the side surface of the mesh 3 inclined to the downstream side by the dynamic pressure of the liquid 2 to form a bubble lump 7 at the lower edge 3a of the mesh 3. By discharging only the gas permeated through the gas selective permeable membrane 10 of the gas discharging device through the gas absorbing duct 9, the bubble mass 7 does not become a large volume and the bubbles are removed from the liquid 2. The area of the mesh 3 to be separated is secured, and the device can be operated continuously.

In the above embodiment, the mesh 3 is used as the perforated plate. However, another gas discharge device having an opening for passing only the liquid 2 without passing the gas in the liquid 2 may be used. A perforated plate can also be used.

Also, the shape of the perforated plate such as the mesh 3 is not limited to a conical shape, and the collected bubbles can be guided to the downstream side and extruded toward the inner peripheral side of the large diameter portion 1b of the container 1. Any shape may be used, for example, a hemispherical shape, a flat shape inclined to the downstream side, or the like.

The diameter of the opening of the perforated plate such as the mesh 3 varies depending on the diameter of the generated bubbles, but may be any diameter as long as it is smaller than the minimum diameter of the bubbles contained in the liquid 2, and the size is not particularly limited. .

Further, the present embodiment is suitable for zero gravity and microgravity environment because gas can be separated and removed from liquid without using gravity, but it can be used in normal gravity environment. Not to mention.

〔The invention's effect〕

As described above, the present invention provides a space in which gravitational force does not act or gravity is small by adhering air bubbles to a perforated plate and separating air bubbles from a liquid passing through the perforated plate by an adhesive force due to surface tension of the air bubbles. However, bubbles contained in the liquid can be separated and removed from the liquid.

Also, the bubbles separated from the liquid by the perforated plate are pushed down on the perforated plate inclined to the downstream side toward the inner peripheral side of the flow channel by the dynamic pressure of the liquid toward the downstream side, and the pores for separating the bubbles are formed. The area of the plate is ensured, efficient separation of bubbles is performed, and the bubble mass formed on the downstream side is removed by the gas discharge device provided on the inner circumference and the outer circumference side of the flow path in which the bubble mass is formed. The device can be operated continuously by removing lumps of gas.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air bubble removing device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional air bubble removing device for ground use. 1 ... container, 2 ... liquid, 3 ... mesh, 4 ... liquid flow direction, 5 ... bubble flow direction, 7 ...
Bubbles, 8: Flow direction of liquid, 9: Duct for gas absorption, 10: Gas selective permeable membrane, 11: Flow direction of gas phase.

Claims (1)

(57) [Claims] 1. The method according to claim 1, wherein bubbles contained in the liquid flowing through the flow path are
Separated from the liquid by the interfacial tension and adhered, and the dynamic pressure of the liquid causes the adhered bubbles to be pushed out to the downstream side of the flow path to be collected and disposed in the flow path. The perforated plate and the collected air bubbles are sucked, and the gas selectively permeable membrane that selectively permeates only the gas of the gas-liquid mixture is transmitted therethrough. A device for removing gas in a liquid, comprising: a device for discharging gas.