JP2646442B2 - Bubble generation method and liquid pump used in the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bubble generation method for filling a liquid tank with ultrafine bubbles and a liquid pump for mixing ultrafine bubbles in a discharge liquid.

[0002]

2. Description of the Related Art In breeding aquatic animals in a cage or a water tank, controlling the quality of water in a hydroponic cultivation tank, purifying sewage and waste liquid, and regenerating a system, air is increased by an air pump to increase the amount of dissolved oxygen in the liquid. Air is blown into the liquid or taken in while falling from a position higher than the liquid surface in the process of circulating the liquid. However, in such a method, since the bubbles are too large, for special applications requiring a large amount of fine bubbles, for example, in order to float cutting chips in waste liquid together with the bubbles and collect them collectively at the liquid level. When employed, the recovery rate was extremely poor, and the utility was poor. Conventionally, as bubble generation pumps for the purpose of generating fine bubbles, for example, Japanese Utility Model Application Laid-Open No. 52-33703 and Japanese Utility Model Application Laid-Open No. 55-6738.
No. 5, JP-A-49-53552, JP-A-48-55552
A technique disclosed in, for example, Japanese Patent Application Laid-Open No. 71401/1995 is known.

[0001]

In the conventional bubble generating pump, the tip of the air introduction pipe is opened in a flow passage near the suction port or in a ventilation chamber communicating with the pump chamber. This is suitable for sending a large amount of air into the pump chamber, since the air is sucked by the negative pressure generated by the flow of the liquid by arranging the tip of the air introduction pipe in the flow path. The air flowed through the pump chamber at a high speed along with the flow of the liquid, and the agitating action with the fluid was insufficient, making it impossible to fill the ideal ultrafine bubbles, and the air volume was too large. That would be a disaster and reduce the capacity of the liquid pump.

[0004]

As described above, the center of rotation of the impeller has a relatively slow whirlpool like a typhoon, so the aim was to find out how much air could be sucked in. Until now, there was no idea that the opening of the tip of the air introduction pipe would be closer to the center of rotation of the impeller. However, if the generation of the desired ultrafine bubbles was not realized, it was determined that another idea was necessary, so that the arrangement of the air introduction pipe was reviewed and the optimum arrangement of the pipe tip was established. The gist of the present invention is that, when a liquid is sucked from a suction port of the turbo-type pump in a circulation path in which a liquid in the liquid tank is sucked and returned to the liquid tank by a turbo-type pump, the pump enters the pump chamber from the suction port. Air is drawn in from the air introduction pipe with the protruding tip opening pointed toward the center of rotation of the impeller, causing extremely fine bubbles to be mixed into the circulating liquid. A bubble generation method characterized by filling ultra-fine bubbles with air, and a turbo-type pump that pumps liquid sucked from a suction port to a discharge port by an impeller rotating at high speed in a pump chamber. The liquid pump has a tip of the air introduction pipe which is opened to the outside and protrudes from the suction port into the pump chamber, and an opening of the tip is directed toward the rotation center of the impeller. The term "turbo pump" here includes centrifugal pumps, mixed flow pumps, and axial pump pumps, and does not include reciprocating pumps represented by plunger pumps and rotary pumps represented by gear pumps, which do not have impellers. Means

[0005]

[Function] Since air is introduced from a position close to the center of rotation of the impeller with low negative pressure, the air suction efficiency is somewhat sacrificed, but the air is sucked in gently, and thus fine adjustment is made in a range where the amount of mixing is small. It is easy to perform, and the performance of the pump itself is hardly reduced. Also, when the air is gently sucked, when it is strongly pushed in the centrifugal direction by the impeller, it suddenly changes into fine particles due to the rapid change in pressure. There is no reduction in the ability of

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which a bubble generating method according to the present invention and a liquid pump used for the method are implemented in a waste liquid regenerating tank will be described with reference to the drawings. 1 is a liquid storage tank,
In the liquid storage tank 1, used working fluid 2 flowing out from a machine tool or the like (not shown) is sequentially supplied together with cutting chips and the like so that a constant amount is always stored. The storage tank 1 is provided with a plurality of assembly pumps 3.3, which assemble the processing liquid 2 from the storage tank 1 and send out the processing liquid 2 to the filtration device, and re-supply it therefrom to the machine tool or the like. . The means for re-supply to the filtration device, the machine tool and the like are the same as those used in the existing waste liquid reprocessing system, and therefore the description thereof is omitted here.

[0007] Reference numeral 4 denotes a liquid pump.
This is a submerged horizontal type in which the motor housing portion 4a is put into the liquid and used. A pump chamber 4b connected to the motor housing portion 4a is provided with a motor 5 housed in the motor housing portion 4a. A high-speed rotating impeller 6 is provided.
In the pump chamber 4b, a water suction port 7 is opened coaxially with the impeller 6 on the opposite side of the motor housing section 4a, and a discharge port 8 is protruded from a side part of the pump chamber 4b. The liquid is discharged from the discharge port 8 at a high pressure. A flow straightening plate 9 is disposed in front of the opening of the water suction port 7 via a support leg 9a. Outside the liquid pump 5, the end of the straightening plate 9 penetrates and serves as an air inlet. Are protruded into the pump chamber 4b, and a pair of air introduction pipes 10.10 are provided with the front end opening directed toward the center of the impeller 6. Each of the air introduction pipes 10.10 is supported and fixed to the outer wall of the motor housing portion 4a, and the other end, which is an air introduction port, stands upright so as to protrude above the liquid level of the liquid storage tank 1 therefrom. It has become something. A flow control valve 11.11 for controlling the amount of air to be introduced is attached to the air inlet opening projecting above the liquid surface.

The liquid pump 4 has a discharge port 8 arranged horizontally with the bottom surface in the tank, and the jetted processing liquid is fixed along the inner wall of the liquid storage tank 1 so as to form a vortex in the tank. ing. The liquid pump 4 is connected to the air introduction pipe 1 as described above.
Since the tip of 0.10 protrudes into the pump chamber and the opening of the tip faces the center of the impeller 6, the air introduced from the air introduction pipe 10.10 slowly flows into the working fluid sucked from the water suction port 7. And the air is pulverized by the impeller 6 in the pump chamber 4b, and at the same time, undergoes a rapid pressure change to be converted into micro bubbles.
Has a function of vigorously discharging 2.12... From the discharge port 8 together with the processing liquid into the liquid storage tank.

In the waste liquid regenerating tank configured as described above, a large amount of ultra-fine bubbles mixed in the processing liquid spouted from the liquid pump 4 is discharged into the liquid storage tank, thereby storing the liquid. The processing liquid in the tank 1 is stirred, and foreign matters such as cutting chips mixed in the processing liquid float.
In addition, the bubbles that have become saturated in the liquid gradually rise while embracing floating cuttings and the like, and form a bubble layer 13 below the liquid surface. In addition, the filling of the air bubbles activates the working fluid and prevents rot. Cutting chips and the like that have risen and are wrapped in a foam layer are in a state where they can be easily scooped together with air bubbles by a net or the like. For automatic collection in a factory or the like, suction by a vacuum device is effective.

[0010] The liquid pump can be used not only in a waste liquid regeneration treatment tank but also in a hydroponic cultivation tank or a fish cage, in which case one of a pair of air introduction pipes is used for air introduction and the other is sterilized. It can also be used to supply chemicals, fertilizers, and baits, and is expected to have a wide range of uses. Also, the air introduction pipe may be only one, or three or more.
As shown in the figure, the space between the tip of the air introduction pipe 10 and the center of rotation of the impeller 6 can be adjusted by, for example, being screwed to the current plate 9 so that an optimal bubble is formed according to each purpose. Wide versatility can be provided.

In the above-mentioned embodiment, the horizontal type of the submerged type is described. However, the direction of the discharge port may be bent at 90 degrees to be a vertical type, and as shown in FIG. It may be of a type that is disposed outside and is not submerged so that liquid is sucked through the suction pipe 14. The air introduction pipe is inserted from the peripheral wall of the suction pipe 14, and the tip is inserted into the pump chamber. It will protrude. In such a liquid pump, even if the operation is started with the flow control valve 11 fully opened from the beginning, a sufficient suction pressure for sucking up liquid cannot be secured. Only the working fluid is circulated according to a predetermined procedure, and when it is confirmed that the working fluid has been operated satisfactorily, the flow rate control valve 11 is opened little by little, so that fine bubbles are mixed into the ejected working fluid. The waste liquid regeneration treatment tank of the embodiment is configured to perform bubble generation and stirring with only one liquid pump, but in order to further increase the stirring force,
It is also possible to use a plurality of liquid pumps, or to provide a stirring pump separately from the liquid pump and use both pumps in combination,
Furthermore, if a liquid pump is added to the existing liquid storage tank without changing the conventional device, it becomes possible to efficiently collect cutting chips that could not be collected conventionally.

[0012]

According to the present invention, if the method of the present invention is carried out in a waste liquid regeneration treatment tank, cutting chips in the tank can be efficiently floated by ultra-fine bubbles and collectively collected. Also, if the liquid pump of the present invention is used, the amount of dissolved oxygen in the liquid can be controlled to be optimal for activation by the mixing of ultra-fine bubbles, whereby an outstanding self-purifying effect is exhibited,
In addition to waste liquid regeneration treatment, it can be used for hydroponics, fish cages, etc.
The liquid chamber can be stabilized by preventing rot of organic impurities.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a waste liquid treatment tank in which a bubble generation method according to the present invention is implemented.

FIG. 2 is an explanatory diagram of a liquid pump according to the present invention.

FIG. 3 is an explanatory diagram showing a structure of a liquid pump.

FIG. 4 is an explanatory view showing a modified example of the liquid pump.

FIG. 5 is an explanatory view showing a modified example of the liquid pump.

[Explanation of symbols]

1 ・ ・ Reservoir, 2 ・ ・ Processing fluid, 3 ・ ・ Pumping pump,
4 liquid pump, 4a motor storage section, 4b pump chamber, 5 motor, 6 impeller, 7 inlet port, 8
..Discharge port, 9 ... Rectifier plate, 9a ... Support leg, 10 ...
Air introduction pipe, 11 ... Flow control valve, 1
2 ... bubbles, 13 ... layers of foam, 14 ... suction pipes.

Claims (2)

(57) [Claims] When a liquid is sucked from a suction port of a turbo-type pump in a circulation path in which a liquid in a liquid tank is sucked and returned to the liquid tank by a turbo-type pump, a tip protruding into the pump chamber from the suction port. The air is sucked from the air introduction pipe with the opening directed to the center of rotation of the impeller, and the extremely fine bubbles are mixed into the circulating liquid. A method for generating bubbles, characterized by filling bubbles. 2. A turbo-type pump for sending liquid sucked from a suction port to a discharge port by an impeller rotating at a high speed in a pump chamber. A liquid pump that protrudes into the pump chamber and has its tip opening directed toward the center of rotation of the impeller.