JPH10337580A - Ozone water generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time required to stabilize the concentration of ozone water at a target value by controlling the concentration thereof. SOLUTION: The ozone water generating device 1 includes a mixing pump 9 to mix ozone gas with water, a flowmeter 11 for measuring ozone water disposed in an ozone water feed pipe 10, a flow rate regulating valve 12 to regulate the flow rate of ozone water flowing through the pipe 10 to a specified flow rate, a deaerator 14 disposed in a branch pipe 13 diverging from the pipe 10 to remove fine bubbles in the ozone water flowing through the pipe 10, and an ozone water concentration meter 15 to measure the concentration of ozone of ozone water delivered from the deaerator 14. A control device 16 controls the number of revolution of the pump 9 based on the concentration of ozone water sensed by the concentration meter 15 to control the concentration of ozone water generated at the pump 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone water generator, and more particularly to an ozone water generator configured to efficiently dissolve ozone gas in water.

[0002]

2. Description of the Related Art In a conventional ozone water generating apparatus, for example, an ejector for dissolving ozone gas in water using a flow rate of a water flow, a mixing pump or a tank driven by a motor for forcibly mixing water and ozone gas are used. Ozone gas generated by an ozone generator as an ozone gas generation means is dissolved in water using a stirrer or the like for stirring ozone gas into water.

[0003] In the conventional ozone water generating apparatus, the ozone water concentration is controlled to a preset target value by controlling the voltage of the ozone generator to change the amount of ozone gas generated.

[0004]

However, there is a problem that the range in which the concentration can be controlled is narrow because the amount of generated ozone gas does not change greatly even when the applied voltage of the ozone generator is changed as in the prior art. Further, the conventional device requires a certain amount of time to stabilize the amount of ozone gas generated after a voltage change due to the characteristics of the ozone generator, and thus has a problem that the time required for the ozone water concentration to stabilize is long.

[0005] Therefore, an object of the present invention is to provide an ozone water generating apparatus which solves the above-mentioned problem.

[0006]

In order to solve the above problems, the present invention has the following features. Claim 1
The present invention has an ozone gas generating means for generating ozone gas, a mixing pump for mixing ozone gas generated by the ozone gas generating means with water, and an ozone water concentration detecting means for detecting the concentration of mixed ozone water. The ozone water generating apparatus is characterized in that it has control means for controlling the number of revolutions of the mixing pump according to the ozone water concentration detection signal detected by the ozone water concentration detection means.

Therefore, according to the first aspect of the present invention, the ozone water concentration can be reduced in a short time by controlling the rotation speed of the mixing pump in accordance with the ozone water concentration detection signal detected by the ozone water concentration detection means. It can be adjusted to any concentration. According to a second aspect of the present invention, in the ozone water generating apparatus according to the first aspect, fine bubble removing means is provided upstream of the ozone water concentration detecting means.

According to the second aspect of the present invention, since the fine bubble removing means is provided upstream of the ozone water concentration detecting means, the ozone concentration detection by the ozone water concentration detecting means becomes more accurate, and the accuracy of the ozone water concentration adjustment is improved. Is higher.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an ozone water generating apparatus according to the present invention. Ozone water generator 1
In general, an oxygen generator 2 that generates high-concentration oxygen gas, an ozone gas generator 3 that generates ozone gas using high-concentration oxygen gas supplied from the oxygen generator 2 as a raw material, and an ozone gas supply pipe 4 An ozone gas supply valve 5 arranged to start or stop supply of ozone gas discharged from the ozone gas generator 3, a water measurement flow meter 7 for measuring a supply amount of water flowing through a water supply pipe 6, and a water supply pipe It has a water supply valve 8 for opening and closing the passage 6 and a mixing pump 9 for mixing the ozone gas supplied from the ozone gas supply line 4 with the water supplied from the water supply line 6 at a predetermined ratio.

The ozone water generating apparatus 1 has a flow meter 11 for measuring ozone water provided in an ozone water supply pipe 10 extending downstream of the mixing pump 9 and a flow rate flowing through the ozone water supply pipe 10. Flow control valve 12 for adjusting the pressure to a predetermined flow rate
A defoamer (fine bubble removing means) 14 disposed in a branch pipe 13 branched from the ozone water supply pipe 10 to remove fine bubbles in ozone water flowing through the ozone water supply pipe 10;
An ozone water concentration meter (ozone water concentration detecting means) 15 for measuring the ozone concentration of the ozone water discharged from the defoamer 14;

The high-concentration oxygen gas obtained by being separated and concentrated from the air by the oxygen generator 2 is supplied to an ozone gas generator 3, where
For example, it becomes ozone gas by a silent discharge method. And
The ozone gas generated by the ozone gas generator 3 is supplied to a mixing pump 9 as a gas-liquid mixer when the ozone gas supply valve 5 is opened.

The water supplied from the water pipe to the water supply line 6 is supplied to a mixing pump 9 via a flow meter 7 and a water supply valve 8, where the water is mixed with ozone gas and mixed with ozone water. Become. Then, the ozone water discharged from the mixing pump 9 removes fine bubbles generated by the mixing pump 9 in the process of passing through the defoamer 14, and then the ozone water concentration is detected by the ozone water concentration meter 15. Therefore, in the ozone water concentration meter 15, since the air bubbles which obstruct the measurement of the ozone water concentration, particularly the fine air bubbles, are removed by the defoamer 14, the concentration of the ozone water discharged from the mixing pump 9 can be accurately measured. It can measure well. The bubbles removed at this time are detoxified in an ozone decomposition tank (not shown) or the like, and then released into the atmosphere.

When the flow rate of the ozone water supply pipe 10 is reduced by the flow rate control valve 12 below the discharge rate from the mixing pump 9, the pressure between the mixing pump 9 and the flow rate control valve 12 can be maintained in a pressurized state. . Therefore, the flow control valve 12
The pressure between the mixing pump 9 and the flow control valve 12 can be changed by controlling the rotation speed of the mixing pump 9 with the throttle opening kept at a predetermined value.

The ozone water supply line 10 and the branch line 1
The ozone water that has passed through 3 is fed to the downstream side and used, for example, for washing fresh food. A control device 16 controls the concentration of ozone water, and controls the number of revolutions of the mixing pump 9 based on the concentration of ozone water detected by the ozone water concentration meter 15 to adjust the concentration of ozone water generated by the mixing pump 9. I do. The target ozone water concentration value is set in the control device 16 in advance to an arbitrary value, and the mixing pump 9 is controlled so that the ozone water concentration value detected by the ozone water concentration meter 15 becomes the target ozone water concentration value. A control program for controlling the number of revolutions has been input.

FIG. 2 is a sectional view showing the inside of the mixing pump 9. The mixing pump 9 has a circular stirring chamber 18 provided inside a casing 17, and a stirring device 19 rotatably provided inside the stirring chamber 18. The stirrer 19 includes a drive shaft 2 of a drive motor (not shown).
0 and is driven to rotate in the direction A (counterclockwise).

Further, the stirrer 19 is provided with a plurality of blades 21 (21 _{1 to} 21 _n ) projecting radially from the outer periphery at predetermined intervals. Therefore, the fan-shaped space defined by the inner periphery of the stirring chamber 18 and the space between the blades 21 becomes the gas-liquid mixing chamber 22. The gas-liquid mixing chamber 22 moves in the circumferential direction while the agitator 19 rotates. The casing 17 has a water supply passage 23 communicating with an inlet 18 a of the stirring chamber 18 formed in a circular shape, and an ozone gas supply passage 24 joining the water supply passage 23, and a discharge communicating with an outlet 18 b of the stirring chamber 18. It has a passage 25. The water supply passage 23 communicates with the water supply pipe 6, and the ozone gas supply passage 24 communicates with the ozone gas supply pipe 4. Also, the discharge passage 25
Is connected to an ozone water supply pipeline 10.

Accordingly, while the stirrer 19 rotates in the direction A, the water from the water supply passage 23 and the ozone gas supply passage 2
4 is supplied to the inlet 18 a of the stirring chamber 18. Therefore, the stirrer 19 rotates and the blades 21 (2
When the gas-liquid mixing chamber 22 formed between 11 _{1 to} 21 _n ) reaches a position communicating with the inlet 18 a of the stirring chamber 18, the water from the water supply passage 23 and the ozone gas from the ozone gas supply passage 24 are simultaneously formed. It is introduced into the gas-liquid mixing chamber 22.

When the ozone gas and water are mixed while the gas-liquid mixing chamber 22 moves from the inlet 18a to the outlet 18b of the stirring chamber 18, and the gas-liquid mixing chamber 22 reaches a position communicating with the outlet 18b, The mixed ozone water is discharged from the outlet 18b to the discharge passage 25. As described above, in the mixing pump 9, as the rotation speed of the stirrer 19 increases, the gas-liquid mixing chamber 22 moves at a higher speed and the discharge amount increases.

Therefore, when the stirrer 19 is rotated at a high speed in a state where the opening degree of the flow control valve 12 disposed downstream of the mixing pump 9 is narrowed, the ozone introduced into the gas-liquid mixing chamber 22 The ozone gas bubbles in the water are compressed while being mixed and diffused into small bubbles. Further, the mixing pump 19 has been described by way of example as a configuration in which the stirrer 19 having the plurality of blades 20 is rotated as in the above-described embodiment. However, the configuration of the mixing pump 19 is not limited to this. Of course, such a device may be used as a mixing pump.

FIG. 3 is a view showing the structure of the defoamer 14.
The defoamer 14 communicates with an ozone water inlet 26 to which the branch pipe 13 is connected, a gas-liquid separation chamber 27 for removing excess ozone gas contained in the ozone water, and an upper part of the gas-liquid separation chamber 27. An ozone gas exhaust port 28, a filter 29 having fine small holes made of, for example, stainless steel, glass fiber, and tetrafluoroethylene resin, and an ozone water discharge port 30 for discharging ozone water passing through the filter 29 are provided.

The filter 29 prevents air bubbles contained in the ozone water from passing therethrough and separates the air bubbles from the ozone water. Therefore, the ozone water in which the ozone gas is dissolved passes through the filter 29.
Is discharged from the ozone water discharge port 30 and supplied to the ozone water concentration meter 15. Therefore, the ozone water concentration meter 15
Detects the concentration of ozone water from which excess ozone gas bubbles have been removed by the filter 29 of the defoamer 14.

The ozone gas bubbles that have not passed through the filter 29 move upward from the gas-liquid separation chamber 27 and are exhausted from the ozone gas exhaust port 28. The ozone gas exhausted from the ozone gas exhaust port 28 is exhausted as it is to the atmosphere, or is collected in an ozone gas treatment tank (not shown), returned to oxygen, and released to the atmosphere.

Here, the density control processing executed by the control device 16 will be described with reference to FIG. Control device 1
6 starts the ozone water generator 1 in SP1, and then returns to S
At P2, the target ozone water concentration a is set. In the next SP3, the ozone water concentration b measured by the ozone water concentration meter 15 is read, and it is determined whether or not the target ozone water concentration a set in SP4 is equal to the measured ozone water concentration b.

In SP4, when a = b, the ozone water concentration b discharged from the defoamer 14 is the same as the target ozone water concentration a, so that the process proceeds to SP8 without controlling the mixing pump 9. I do. Then, when the ozone water generation device 1 is stopped in SP8, the concentration control process ends,
To continue the ozone water generation, return to the above SP3, and
The processing after 3 is executed.

In the above SP4, when the ozone water concentration b does not coincide with the target ozone water concentration a, (a ≠
b) The process proceeds to SP5, where the target ozone water concentration a and the ozone water concentration b are compared. In this SP5, the target ozone water concentration a
When the ozone water concentration b is lower (a> b), SP6
The control is performed such that the rotation of the mixing pump 9 is increased by a predetermined constant rate (for example, 5% in this embodiment).

That is, by increasing the rotation speed of the stirrer 19 incorporated in the mixing pump 9 by 5%, the stirring is performed vigorously and the flow rate is regulated by the flow control valve 12, so that the mixing pump 9 Between the discharge side and the flow control valve 12 is in a pressurized state. Therefore, the amount of ozone dissolved in the ozone water mixed by the mixing pump 9 increases, and the ozone water concentration b increases accordingly.

Then, returning to SP4, the ozone water concentration meter 1
Steps SP4 to SP6 are repeated until the ozone water concentration b measured in step 5 matches the target ozone water concentration a. Also,
When the ozone water concentration b is higher than the target ozone concentration a in SP5 (a <b), the process proceeds to SP7, and the rotation of the mixing pump 9 is set to a predetermined constant rate (for example, 5% in this embodiment). ) Control to lower only.

That is, by reducing the rotation speed of the stirrer 19 incorporated in the mixing pump 9 by 5%, the pressure on the discharge side of the mixing pump 9 decreases. Therefore, the amount of ozone dissolved in the ozone water mixed by the mixing pump 9 decreases, and the ozone water concentration b decreases accordingly. After that, returning to SP4, the ozone water concentration meter 15
Is the target ozone water concentration a
The processing of SP4, SP5, and SP7 is repeated until the values match.

When the ozone water concentration b coincides with the target ozone water concentration a, the rotational speed of the mixing pump 9 is kept fixed at that position. Thereafter, the process proceeds to SP8, and it is determined whether or not the ozone water generation device 1 is stopped. If there is no stop signal in SP8, the process returns to SP3 and executes the processing after SP3. As described above, while the ozone water generation device 1 is operating, the ozone water concentration value measured by the ozone water concentration meter 15 is monitored and the rotation of the mixing pump 9 is controlled, so that the ozone water is discharged from the mixing pump 9. The ozone water concentration is maintained at a preset target ozone water concentration a. In the ozone water generator 1,
Since the rotation of the mixing pump 9 is controlled while keeping the ozone gas generation amount at the maximum generation amount while keeping the voltage value of the ozone gas generation device 3 constant, the time until the ozone water concentration stabilizes is short. 3, the ozone water concentration b can be adjusted to the target ozone water concentration a in a shorter time than in the conventional method of changing the voltage value.

Therefore, even when the target ozone water concentration a is changed to an arbitrary value, the ozone water concentration b is changed to the target ozone water concentration a.
And the ozone water concentration can be finely and finely adjusted to an arbitrary concentration. FIG. 5 is a graph for comparing the control range of the present invention for controlling the rotation of the mixing pump 9 with the conventional control range for controlling the voltage value of the ozone generator.

In FIG. 5, the range surrounded by the ABCD line is the control range of the present invention, and the range is A'-B'-C'-.
The range surrounded by the line D 'is the conventional control range. Also,
The horizontal axis shown in FIG. 5 shows the ozone water discharge amount, and the vertical axis shows the ozone water concentration. The control range ABCD for controlling the rotation of the mixing pump 9 as in this embodiment.
And a control range A′-B′-C′-D ′ for controlling the voltage value of the ozone generator as in the prior art, the control range A
It can be seen that -BCD can be controlled in a wider range than the control range A'-B'-C'-D '.

In particular, even when the discharge amount of ozone water is changed, the control range ABCD has a higher upper limit of the ozone water concentration than the control range A'-B'-C'-D ', and the lower limit. Is lower. That is, in FIG. 5, the control range A '
The diagonal lines (hatched) shown above and below -B'-C'-D 'are extended portions in which the concentration can be controlled by controlling the rotation of the mixing pump 9.

Therefore, even if the ozone gas generator 3 has the same capacity as the conventional one, the voltage of the ozone gas generator 3 is kept constant and the ozone gas generation amount is maintained at the maximum generation amount. By performing the rotation control, the upper limit and the lower limit of the control range of the ozone water concentration can be respectively extended, and the ozone water generation capability of the ozone water generation device 1 can be further increased.

In the above embodiment, the ozone water concentration meter 15
Is provided in the branch pipe 13 branched from the ozone water supply pipe 10, but the invention is not limited to this, and the ozone water concentration meter 15 may be provided in the ozone water supply pipe 10.

[0035]

As described above, according to the first aspect of the present invention,
Since the rotation speed of the mixing pump is controlled in accordance with the concentration detection signal of the ozone water detected by the ozone concentration detection means, the bubbles of the ozone gas corresponding to the rotation speed of the mixing pump can be compressed and dissolved in water. The ozone water concentration can be adjusted to the target ozone water concentration in a shorter time than the method of adjusting the ozone water concentration by changing the voltage value of the ozone gas generator, and the ozone water concentration can be adjusted to an arbitrary concentration. Fine adjustments can be made.

According to the second aspect of the present invention, since the fine air bubble removing means is provided upstream of the ozone concentration detecting means, the ozone concentration detecting means can more accurately detect the ozone concentration and the ozone water concentration adjusting precision can be improved. Has been enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an ozone water generating apparatus according to the present invention.

FIG. 2 is a sectional view showing the inside of a mixing pump.

FIG. 3 is a diagram showing a configuration of a defoamer.

FIG. 4 is a flowchart illustrating a density control process performed by a control device.

FIG. 5 is a graph for comparing a control range of the present invention for controlling the rotation of the mixing pump with a conventional control range for controlling the voltage value of the ozone generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ozone water generator 2 Oxygen generator 3 Ozone gas generator 4 Ozone gas supply pipe 5 Ozone gas supply valve 6 Water supply pipe 7 Water measurement flow meter 9 Mixing pump 10 Ozone water supply pipe 11 Ozone water measurement flow meter 12 Flow control valve 13 Branch line 14 Defoamer 15 Ozone water concentration meter 16 Controller 17 Casing 18 Stirring chamber 19 Stirrer 29 Filter

Claims (2)

[Claims] 1. An ozone gas generating means for generating ozone gas, a mixing pump for mixing ozone gas generated by the ozone gas generating means with water, and an ozone water concentration detecting means for detecting the concentration of mixed ozone water. An ozone water generation apparatus, comprising: control means for controlling the number of revolutions of the mixing pump according to the ozone water concentration detection signal detected by the ozone water concentration detection means. 2. The ozone water generation apparatus according to claim 1, further comprising a fine bubble removing means provided upstream of said ozone water concentration detection means.