JPH02237631A - Bubble generation device - Google Patents

Abstract

PURPOSE:To eliminate wasteful gas by taking out the excess gas which is not dissolved in liquid to accumulate in a buffer part and joining it with new gas at the buffer part to return to a pressurizing pump. CONSTITUTION:The excess gas in a pressurized state is passed through the hole of a perforated plate and the clearance of the plate pushed with a spring in a gas discharge unit and entered into the buffer part through a discharge pipe. The pressure of new gas from an outside gas source 20 is reduced to the pressure almost equal to the inner pressure of the buffer part 12 by a pressure reducing valve 21, and the new gas is introduced to the buffer part 12 through a throttle valve 22 controlling the flow rate to a target value and a check valve 23. The buffer part is connected to the suction pipe 2 of a pump 3, and the gas is pressurized and mixed with the liquid to dissolve the gas into the liquid. Thus, the wasteful consumption of gas is eliminated, and the gas is usefully used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a bubble generator for supplying fine bubbles by dissolving gas in a liquid under pressure.

[Conventional technology]

FIG. 3 shows an example of a conventional bubble generator.

This is an outline of the device shown in Japanese Patent Application Laid-Open No. 61-271019, in which a liquid 9 sucked in from the suction pipe 2 and a gas 10 sucked in from the suction pipe 8 are sucked into the accumulator 4 by a pressurizing pump 3, and the gas 10 is transferred to the liquid 9. By dissolving the mixture under pressure and reducing the pressure with a nozzle 6, fine bubbles with a diameter of more than 10 microns are precipitated in the tank 1. Conventionally, in order to precipitate a large number of microbubbles, it was necessary to supply an amount several tens of times the amount of gas to be dissolved in order to promote dissolution. The undissolved gas is discharged from the accumulator 4 together with a small amount of liquid 9, and the gas bubbles are mixed into the discharge pipe 5, so that no large bubbles are discharged from the nozzle 6.

In this bubble generator, the above-mentioned undissolved surplus gas 1
Since a small amount of liquid is discharged from the accumulator 4 along with the liquid 9, there is a problem in that the liquid 9 must be returned to the tank 1 as shown in FIG. In addition, since the amount of dissolved gas is only a few tenths of the amount of gas supplied, it is wasteful to throw away excess gas, and if it is an expensive gas, it will be a big loss, and a recovery device will be required to recover it. There was a problem.

[Problem to be solved by the invention]

This explanation has been made in light of the problems mentioned above. The purpose is to provide a bubble generator that eliminates waste of gas to be dissolved under pressure and has simple piping.

[Means to solve the problem]

The gist of this explanation is about a bubble generator that precipitates fine bubbles by reducing the pressure of a liquid in which a gas is dissolved under pressure using a pressure pump and then reducing the pressure with a nozzle. Excess gas not dissolved in the liquid under pressure is taken out by an exhaust device 17 connected to the accumulator. This gas-liquid mixture is introduced into the buffer section 12. A check valve 23 is inserted into this buffer section from the outside.
This bubble generating device is characterized by adding new gas through the pump and returning it to the suction port side of the pressurizing pump.

[For production]

In the surplus gas feedback device configured as described above, the pressurized surplus gas in the accumulator is discharged by the discharge device, and the surplus gas is discharged at the buffer section at a pressure slightly higher than the atmospheric pressure.

The exhaust system has the structure shown in Figure 2, and excess gas under pressure is discharged from the buffer section through a hole in a perforated plate and a gap exhaust pipe that is pressed by a spring. The pressure of the derived gas is 0 to 0.3 kgf.
/cnf-G The strength of the disk spring is adjusted.

The amount of gas taken out and returned to the buffer section as surplus gas is 85 to 98% of the amount of air entering the pressurizing pump section. For this reason, it is necessary to supplement 15% to 2% of additional gas from the outside. This gas is introduced from an external gas source 20 into the buffer section 12 through a pressure reducing valve 21 that reduces the pressure to approximately the same as the internal pressure of the buffer section 12, and through a throttle valve 22 and check valve 23 that limit the flow rate to a target value. . This is connected to the suction pipe 2 of the pressurizing pump 3, and the liquid is mixed and pressurized to dissolve the gas. In this way, the excess gas 14 repeats the process of being fed into the pressure pump 3 while replenishing from the external gas source 20 the amount of gas lost by pressure dissolution in the pressure pump 3. This allows you to avoid wasting gas.
To use even a small amount of liquid discharged together with surplus gas 14 from an exhaust device without wasting it.

〔Example〕

below. An embodiment will be explained based on FIG. Pressure pump 3
The suction pipe 2 has an opening in the liquid tank 1 and sucks in the liquid 9.

Further, an intake port 16 is connected to the intake pipe 2, and this is connected to the buffer section 12. Gas is introduced into this buffer section 12 from the outside by connecting an external gas source 20, a pressure reducing valve 21, and a throttle valve 22 via a check valve 23. The pressure reducing valve 21 is for reducing the pressure of the supplied gas from the external gas source to a pressure approximately equal to the pressure of the buffer section (approximately 0.3 kgf/cnf-G), and the throttle valve 22 is used to reduce the inflow flow rate of the supplied gas. The check valve 23 is used to prevent backflow even when the pressure in the buffer section becomes high.

An exhaust pipe 7 is connected to the buffer section 12 to introduce surplus gas 14 exhausted from an exhaust device 17 connected to the accumulator 4 . In this exhaust gas, there is also a small amount of liquid discharged together with the gas, which also passes through the suction pipe 16 and enters the suction pipe 2 together with the gas, and is returned to the pressurizing pump. The pressurized and dissolved liquid is sent from the accumulator 4 through the discharge pipe 5 to the nozzle 6, and is discharged from the nozzle into the liquid under reduced pressure to precipitate the dissolved gas and generate fine bubbles.

The exhaust system has the structure shown in Figure 2. Connected to the upper part of the accumulator 4, surplus gas enters through the suction port 36, and the piston 32 is installed perpendicularly to the disk 44 through the hole 43 of the perforated plate 35.
It is supported by and allows vertical movement. This is pressed against a perforated plate 35 by a spring 33. With this configuration, when the excess exhaust gas is pushed against the disc 44 and exhausted, the pressure is reduced to about 0.3 kgf/cuLG due to the resistance caused by the spring. Excess gas passes through the exhaust port 39 and the exhaust pipe 7 and is collected in the buffer section 12. This buffer section has a capacity to alleviate pulsations in the pressure of the gas discharged by the exhaust device.
Flow rate per second (average amount of excess gas discharged per second)
The capacity is preferably about three times or more. Note that external gas source 2
Since the 0 pressure is higher than atmospheric pressure, it has a pressure reducing valve and a throttle valve, but it is also possible to use only a pressure reducing valve and omit the throttle valve, or only a throttle valve and omit the pressure reducing valve. be.

Also, if the pressure in the buffer section is set high. It is necessary to have a throttle valve or orifice plate on the pump suction side to limit the suction amount.

In this example. Although the nozzle 6 is attached to the liquid tank 1 and the liquid is refluxed, it is also possible to attach it to another oak and separate it from the liquid supply tank.

〔Effect of the invention〕

In the present invention, as described above, excess gas and a small amount of liquid discharged from the exhaust device are collected in the buffer section, supplemented with additional gas from an external gas source, and returned to the pressurizing pump. The gas discharged from the accumulator can be used effectively, and the liquid discharged together with the excess gas can also be used effectively.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an outline of a bubble generator according to an embodiment of the present invention, and FIG. 2 is a sectional view of an exhaust device. Third
The figure is a schematic diagram showing a conventional example. The meanings of the symbols in the figure are as follows. Fig. 1 1 ・゛゜tank, 2 ・゛・suction pipe, 3゜・pressure pump. 4...Accumulator, 5...Discharge pipe, 6...Nozzle. 7. ・Discharge pipe, 8-...
・・Intake pipe, 9 ・・Liquid, 12 ・・・・・Buffer part, 13 ・・・・Intake pipe, 14 ・・・・・゛Excess gas, 16゜゛Suction port, 17゜・゜Exhaust device ,20...
... Gas source, 21 ... Pressure reducing valve, 22 ...
... Throttle valve, 23 - Check valve. Fig. 2 4...Accumulator, 7 ・゜゜Exhaust pipe, 31 case. 32...-゜゛'Piston, 33-゛ Spring, 34 ・0 ring, 35...゜Perforated plate 36...One suction port, 37... Piston guide, 38... One exhaust chamber. 39--Exhaust port, 40- Plate holder, 40... Hole, 44
゜ ゛Disk. Fig. 3 1... Tank, 2... Suction pipe, 3-
--- Pressure pump, 4 --- Accumulator, 5 --- Discharge pipe, 6 --- Nozzle, 7
-...1 discharge pipe, 8...intake pipe, 9...1 liquid 10...gas, 14...excess gas.

Claims (1)

[Claims] (1) In a bubble generator that precipitates fine bubbles by reducing the pressure of a liquid in which gas is dissolved under pressure using a pressure pump and a nozzle, excess gas that is not dissolved in the liquid under pressure is connected to an accumulator. A bubble generating device characterized in that air is taken out by an exhaust device and collected in a buffer section, and new gas is made to join the buffer section and returned to a pressurizing pump.