JPH06299984A - Method for generating bubble and liquid pump used with this method - Google Patents

Abstract

PURPOSE:To collect the cutting dusts contained in the machining liquid by filling ultrafine bubbles and activate the machining liquid in the machining liquid. CONSTITUTION:A liquid pump 4 which mixes the air sucked from the part which is extremely close to the center of rotation of a vane-wheel into the machining liquid 2 which is sucked from a liquid tank 1 and ejects the liquid together with the large amount of ultrafine bubbles 12 into the liquid tank 1 is connected to the liquid tank 1 where the machining liquid 2 is stored. The ultrafine bubbles 12 are filled in the machining liquid in the liquid tank 1, and at the same time, the current is given and the cutting dusts are floated thereby.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bubble generating method for filling a liquid tank with extremely fine bubbles, and a liquid pump for mixing extremely fine bubbles into a discharge liquid.

[0002]

2. Description of the Related Art Conventionally, in the breeding of aquatic animals in cages, aquariums, etc., water quality control in hydroponics tanks, purification of sewage and waste liquid, and regeneration systems, in order to increase the amount of oxygen dissolved in the liquid, an air pump is used. Air is blown into the liquid, or is dropped from a position higher than the liquid surface to take in the air during the liquid circulation process. However, if such a method is used for special applications that require a large amount of fine air bubbles, such as when cutting waste in waste liquid is floated together with the air bubbles and collectively collected on the liquid surface, the recovery rate Is extremely bad,
It was poor in practicality. Therefore, the applicant has proposed a liquid pump that sucks air together with the liquid and mixes air bubbles in the discharged liquid, and succeeded in achieving a temporary result in the special application.

[0003]

A conventional bubble generating pump is equipped with a function of connecting an air introducing pipe to a wall surface of a suction pipe, introducing air from the middle of the suction pipe, and adjusting an introduced amount of air. However, no matter how the amount of air introduced is adjusted, it is not possible to fill the liquid tank with ideal bubbles, and the performance of the liquid pump is reduced.

[0004]

According to the semi-invention, it is possible to secure the bubble form suitable for the purpose of use while suppressing the deterioration of the performance as a liquid pump to a minimum. When the liquid is sucked from the suction port of the turbo pump in the circulation path that sucks the liquid and returns it to the liquid tank, the air supplied from the air introduction pipe whose opening is as close as possible to the center of rotation of the impeller Inhale together to mix ultra-fine bubbles in the discharged liquid,
In a turbo pump that discharges liquid sucked from the suction port to the discharge port by a bubble generation method that is characterized by filling the liquid tank with extremely fine bubbles, and an impeller that rotates at high speed in the pump chamber, an air inlet port At the suction port side of the pump chamber,
The liquid pump is arranged so as to be as close as possible to the center of rotation of the impeller. The turbo-type pump includes centrifugal type, mixed flow type, and axial flow type, and does not include reciprocating type typified by a plunger pump and rotary type typified by a gear pump that does not have an impeller. Means

[0005]

[Operation] Since air is introduced from a position near the center of rotation of the impeller with the least negative pressure, the air is gently sucked in, so it is easy to make fine adjustments in the range with a small amount of mixing, and the capacity of the pump itself deteriorates. Also few. Further, since the gently sucked air is strongly pushed out in the centrifugal direction by the impeller, it is made into fine particles by the abrupt pressure change and is mixed into the liquid as extremely fine bubbles.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which a method for generating bubbles according to the present invention and a liquid pump used for the method are carried out in a waste liquid regeneration treatment tank will be described with reference to the drawings. 1 is a liquid storage tank,
The used machining fluid 2 that has flowed out from a machine tool or the like (not shown) is successively supplied together with cutting chips and the like into the liquid storage tank 1 so that a constant amount is always stored. Further, the liquid storage tank 1 is equipped with a plurality of pumping pumps 3.3, ... which pump up the processing liquid 2 from the liquid storage tank 1 and send it out to a filtering device and re-supply it to the machine tool or the like. . The re-supplying means for the filtering device, the machine tool, etc. is the same as that used in the existing waste liquid reprocessing system, and therefore its explanation is omitted here.

Reference numeral 4 is a liquid pump, and this liquid pump 4 is
It is a submersible horizontal type that is used by immersing it in the liquid together with the motor housing portion 4a. In the pump chamber 4b connected to the motor housing portion 4a, the motor 5 housed in the motor housing portion 4a is used. An impeller 6 that rotates at high speed is installed.
Further, in the pump chamber 4b, on the opposite side of the motor housing portion 4a, an intake port 7 is opened coaxially with the impeller 6, and a discharge port 8 is projectingly provided on the side part to suck in from the intake port 7. The liquid is discharged from the discharge port 8 at high pressure. A straightening vane 9 is disposed on the front surface of the opening of the suction port 7 via a support leg 9a, and the liquid pump 5 is provided with a tip which is an air inlet through the center of the straightening vane 9. Is provided with a pair of air introduction pipes 10.10 that are close to the center of the impeller 6 in the pump chamber. 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, is connected to the liquid storage tank
It stands upright so as to project above the liquid surface. Then, at the air introduction port protruding above the liquid surface, a flow rate control valve 11.1 for controlling the amount of introduced air.
1 is attached.

The liquid pump 4 has a discharge port 8 arranged horizontally with the bottom surface in the tank, and the jetted machining liquid flows along the inner wall of the liquid storage tank 1 and is fixed so as to form a vortex in the tank. ing. The liquid pump 4 is provided with the air introduction pipe 1 as described above.
Since the tip of 0.10 is close to the center of the impeller 6 in the pump chamber, the working liquid sucked from the suction port 7 is mixed with the air introduced from the air introduction pipe 10.10, and the inside of the pump chamber 4b is mixed. At that time, the air is made into fine dust by the impeller 6 and converted into extremely fine bubbles.
2.12 ... Has a function of being vigorously discharged from the discharge port 8 into the liquid storage tank together with the processing liquid.

In the waste liquid regenerating treatment tank constructed as described above, a large amount of extremely fine bubbles mixed in the processing liquid ejected from the liquid pump 4 are discharged into the liquid storage tank, so that the liquid storage liquid is stored. The machining fluid in the tank 1 is agitated and foreign matter such as cutting chips mixed in the machining fluid floats.
Further, the air bubbles saturated in the liquid embrace the floating cutting chips and the like and gradually rise to form a foam layer 13 below the liquid surface. In addition, the filling of air bubbles activates the working fluid, so that spoilage does not occur. The cutting debris that floats and is wrapped in a layer of bubbles is in a state of being easily scooped together with bubbles by a net, etc. For automatic recovery in factories, suction with a vacuum device is effective.

The liquid pump can be used in a hydroponic cultivation tank and a cage as well as a waste liquid regeneration processing tank. In that case, one of a pair of air introduction pipes is used for air introduction and the other is sterilized. It can also be used for supplying agents, fertilizers, and baits, and can be expected to have a wide range of uses. Further, the air introducing pipe may be provided with only one pipe or with three or more pipes.
As shown in FIG. 5, for example, it is attached to the straightening plate 9 so as to be screw-feedable so that the distance between the tip of the air introducing pipe 10 and the rotation center of the impeller 6 can be adjusted, and optimum bubbles are formed according to each purpose. It can also have wide versatility.

In the above-mentioned embodiment, the submerged horizontal type has been described, but it is also possible to bend the direction of the discharge port 90 degrees to make a vertical type, and as shown in FIG. It does not matter if it is a type that is provided outside and sucks the liquid through the suction pipe 14 so as not to be submerged, and the air introduction pipe is inserted from the peripheral wall of the suction pipe 14. In such a liquid pump, even if the operation is started with the flow rate control valve 11 fully opened from the beginning, it is not possible to secure a sufficient suction pressure to suck up the liquid, so that the flow rate control valve 11 is first closed. Only the working fluid is circulated according to a predetermined procedure, and when it is confirmed that the working fluid has been operated smoothly, the flow rate control valve 11 is gradually opened to adjust so that fine bubbles are mixed in the jetted working fluid. In the waste liquid reclamation treatment tank of the embodiment, it is configured to perform bubble generation and stirring with only one liquid pump, but in order to further enhance the stirring power, a plurality of liquid pumps may be used,
A pump for stirring can be installed separately from the liquid pump and both pumps can be used together. Furthermore, if a conventional device is added to the existing storage tank and a liquid pump is added, cutting that could not be collected in the past can be done. The waste can be collected efficiently.

[0012]

When the method of the present invention is carried out in the waste liquid regeneration treatment tank, the cutting waste in the tank can be floated together with the bubbles with extremely high efficiency and collected together. Further, when the liquid pump of the present invention is used, the amount of oxygen dissolved in the liquid can be optimally controlled for activation, and thereby an excellent self-cleaning effect is exhibited. It can be used for cultivation and cages, etc., and can prevent deterioration of organic impurities and stabilize the liquid quality.

[Brief description of drawings]

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

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 diagram showing a modified example of a liquid pump.

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

[Explanation of symbols]

1 ... Reservoir, 2 ... Machining fluid, 3 ... Pumping pump,
4 ・ ・ Liquid pump, 4a ・ ・ Motor storage part, 4b ・ ・ Pump chamber, 5 ・ ・ Motor, 6 ・ ・ Imwheel, 7 ・ ・ Suction port, 8
..Discharge ports, 9 ... Current plate, 9a ... Support legs, 10 ...
Air introduction pipe, 11 ... Flow rate control valve, 1
2 ... Bubbles, 13 ... Bubble layer, 14 ... Intake pipe.

Claims (2)

[Claims] 1. When a liquid is sucked from a suction port of the turbo pump in a circulation path for sucking the liquid in the liquid tank and returning it to the liquid tank by the turbo pump, the opening can be moved to the center of rotation of the impeller. The air supplied from the closest air inlet pipe is also sucked in to mix the microscopic bubbles in the circulating liquid, and ejected from the discharge port into the liquid tank to generate ultrafine bubbles in the liquid in the liquid tank. A method for generating bubbles, characterized by filling the same. 2. A turbo-type pump that discharges liquid sucked from an inlet to an outlet by means of an impeller that rotates at a high speed in the pump chamber, wherein an outlet of an air inlet pipe whose air inlet is open to the atmosphere is provided in the pump chamber. On the suction side of
A liquid pump that is arranged so that it is as close as possible to the center of rotation of the impeller.