JPH0347582A - Fluid treatment apparatus - Google Patents

Abstract

PURPOSE:To obtain a magnetic field having intensity generating the optimum treatment effect corresponding to a use state by providing a current control means comparing electromotive force detected by an electromotive force detection means with a reference value set in a variable manner and controlling an exciting current corresponding to the comparing result. CONSTITUTION:Magnetic fields are generated in a fluid passing space by magnetic field generating means L1, L2 and an exciting current is supplied to the magnetic field generating means L1, L2 by a current supply means 2. Subsequently, the electromotive force generated in the passing fluid by the generated magnetic fields is detected by an electromotive force detection means 3. The electromotive force detected by the electromotive force detection means 3 is compared with a reference value Va set in a variable manner by a comparator 4 and, corresponding to the comparing result, the exciting current to the magnetic field generating means L1, L2 is controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid treatment device using magnetic action.

[Conventional technology]

Conventionally, as this type of fluid treatment device, there is a magnetic water treatment device (Tokuko Sho Publication No. 57-32640, Special Publication No. 6
(See Publication No. 3-61080).

[Problem to be solved by the invention]

However, all conventional water treatment devices cannot vary the strength of their magnetic fields. For this reason, multiple types of water treatment equipment with different magnetic field strengths are available and used selectively, depending on usage conditions such as pipe diameter, flow rate, target water, and structure. However, depending on the site, it may not be applicable to the usage situation, and in such a case, a disadvantage arises in that the desired water treatment effect cannot be obtained.

[Means to solve the problem]

The present invention has been made to solve such problems, and the first invention is a magnetic field generating means for generating a magnetic field in a space through which a fluid passes, and a current supply for supplying exciting current to the magnetic field generating means. means and an electromotive force detection means for detecting an electromotive force generated in the passing fluid by the generated magnetic field, the electromotive force detected by the electromotive force detection means is compared with a variablely determined reference value, and the comparison result is The excitation current to the magnetic field generating means is controlled accordingly.

Further, the second invention provides a flow velocity detection means for detecting the flow velocity based on the electromotive force generated in the passing fluid by the generated magnetic field, and controls the excitation current to the magnetic field generation means according to the detected flow velocity. This is what I did.

Further, the third invention is the first invention or the second invention, in which limiter means is provided to ensure that the excitation current to the magnetic field generation means is equal to or higher than a predetermined value.

Moreover, the fourth invention utilizes a magnetic field generation section and an electromotive force detection section of an electromagnetic flowmeter as the magnetic field generation means and electromotive force detection means in the first invention.

Moreover, the fifth invention utilizes the magnetic field generation section and flow velocity detection section of an electromagnetic flowmeter as the magnetic field generation means and flow velocity detection means in the second invention.

(Operation) Therefore, in the first invention of the present application, the strength of the magnetic field acting on the passing fluid can be maintained constant according to the reference value, and by changing the reference value, the strength of the magnetic field can be varied. You will be able to do this.

Further, in the second invention of the present application, depending on the flow rate of the passing fluid,
The strength of the magnetic field acting on the passing fluid can be varied.

Further, in the third invention of the present application, in addition to the effects of the first invention described above and the effects of the second invention described above, the minimum strength of the magnetic field acting on the passing fluid is ensured.

Moreover, in the fourth aspect of the present application, in addition to the effects of the first aspect described above, it is possible to provide the magnetic field generating means and the electromotive force detecting means at low cost.

Furthermore, in addition to the effects of the second invention described above, the fifth invention of the present application makes it possible to provide the magnetic field generation means and flow velocity detection means at low cost.

〔Example〕

Hereinafter, the fluid treatment device according to the present invention will be explained in detail.

FIG. 1 is an instrumentation diagram of a water treatment apparatus showing an embodiment of the present invention (first invention). In the same figure, 1 is a water supply and drainage pipe, L
1 and L2 are excitation coils that are arranged in the outer pipe part of the water supply and drainage pipe 1 and generate a magnetic field in the internal space, that is, the space through which fluid (water) passes, and 2 is a rectangular waveform that changes in positive and negative directions with respect to the excitation coils L1 and L2. 3 is an electrode EPI, EP2 installed in the water supply and drainage pipe 1;
A differential amplifier 4 that detects the voltage difference occurring in the differential amplifier 3 compares the detection power of the differential amplifier 3 with a preset reference voltage value Va, and sends a control signal according to the difference to the current supply unit 2. It is a comparator. The current supply section 2 is configured to vary the effective value of the excitation current supplied to the excitation coils L1 and L2 in accordance with a control signal given by the comparator 4. Further, the reference voltage value Va set to the comparator 4 can be varied.

In the water treatment device configured in this way, when an excitation current is supplied from the electrolyte supply unit 2 to the excitation coils L1 and L2, a magnetic field is generated in the internal space of the water supply and drainage pipe l, and this generated magnetic field passes through. The desired treatment effect (water treatment, rust prevention, scale prevention, etc. treatment) can be obtained by acting on the fluid. At this time, an electromotive force is generated by the magnetic field acting on the passing fluid, and the electromotive force generated in the passing fluid is detected by the differential amplifier 3 as a voltage difference generated between the electrodes EPI and EP2. A detection power of 3 is applied to the comparator 4. The comparator 4 compares the detected power of the differential amplifier 3 with a set reference voltage value Va, and sends a control signal to the current supply section 2 according to the difference. The current supply section 2 varies the effective value of the excitation current supplied to the excitation coils L1 and L2 in accordance with the supplied control signal. As a result, the strength of the magnetic field acting on the passing fluid is maintained constant according to the set reference voltage value Va.

Here, if the set reference voltage value Va is changed, the strength of the magnetic field acting on the passing fluid changes according to the changed set reference voltage value Va, and the strength of the changed magnetic field is maintained constant. Become. That is, the reference voltage value V to the comparator 4
By varying a and setting it to an appropriate value, the diameter of the pipe and the flow rate can be determined.

It is now possible to obtain a magnetic field with a strength that produces the optimal treatment effect depending on the usage situation, such as the target water and structure, eliminating the need to have multiple types of water treatment equipment with different magnetic field strengths. Therefore, it becomes easy to manage and can be provided at low cost.

FIG. 2 is a more specific circuit configuration diagram of the water treatment device described above, and its operation is controlled using a processor CPU. That is, in this example circuit,
The processor CPU controls the switching mode of the changeover switch SWI on and off via the input/output circuit I10, and changes the excitation current to the excitation coils L1 and L2 in positive and negative directions to form a rectangular waveform. Further, the electromotive force generated in the passing fluid is detected by the differential amplifier OP as a voltage difference generated between the electrodes EPI and EP2, and then converted into a digital signal by the analog/digital converter ADC, and then sent to the input/output circuit I.
10 to the processor CPU. A value corresponding to the set reference voltage value Va is variably given to the processor CPU via an input device (not shown) such as a keyboard, and this value and the analog/digital converter A
By comparing the value given through the input/output circuit I10 via DC and giving a control signal corresponding to the difference to the amplifier OAI, the passing current value of the transistor Q is changed, and the excitation current is supplied to the excitation coils L1 and L2. Vary the effective value of Thereby, the strength of the magnetic field acting on the passing fluid is maintained constant according to the value corresponding to the set reference voltage value Va given via the input device.

FIG. 3 is a block diagram of a water treatment apparatus showing an embodiment of the present invention (second invention). In this figure, the same reference numerals as in FIG. 1 indicate the same or equivalent components, and the explanation thereof will be omitted. In this embodiment, the flow velocity of the passing fluid is detected by the flow velocity detector 5 based on the detection force of the differential amplifier 3, and a signal corresponding to the detected flow velocity is given to the current supply section 2 as a control signal. I take it as a thing. That is, based on the control signal given by the flow velocity detector 5, the effective value of the excitation current supplied to the excitation coils L1 and L2 is varied, and thereby the strength of the magnetic field acting on the passing fluid is varied according to the flow velocity of the passing fluid. The magnetic field is automatically tuned to the strength that produces the optimal processing effect according to the flow velocity.

In each of the embodiments described above, if a limiter is provided to ensure that the excitation current is at least a predetermined value, the minimum strength of the generated magnetic field can be ensured.

In addition, in the embodiment represented by FIG. 1 described above, the excitation coils Ll and L2 that generate a magnetic field and the differential amplifier 3 that detects the electromotive force generated in the passing fluid as a voltage difference are connected to the magnetic field of the existing electromagnetic flowmeter. It is possible to use a generator and an electromotive force detector.

The same applies to the embodiment represented by FIG. 3 described above, in which the excitation coil Ll generates a magnetic field.

The flow velocity detector 5, which detects the flow velocity based on the electromotive force generated in L2 and the passing fluid, can utilize a magnetic field generation section and a flow velocity detection section of an existing electromagnetic flowmeter. By using the various parts of existing electromagnetic flowmeters in this way,
It becomes possible to promote cost reduction as a water treatment device.

In addition, in the applicant's research, 30% of existing electromagnetic flowmeters
There is a type with a large current of A, and if this electromagnetic flow meter is used, it is possible to obtain a magnetic field of 4000 G (Gauss) with a diameter of 100 mm.

Furthermore, in each of the above-mentioned embodiments, the magnetic field was applied only in the perpendicular direction to the passing fluid.
By arranging the excitation coils L3 and L4 as shown in the figure, the magnetic field may also be applied to the passing fluid in the horizontal direction. It is thought that by applying the magnetic fields in directions perpendicular to each other in this way, the magnetic surface area on the passing fluid increases and the water treatment effect is improved. In this case, the excitation currents supplied to the excitation coils L1 and L2 and the excitation coils L3 and L4 are individually controlled.

Further, in each of the embodiments described above, water is used as the passing fluid, but the present invention is not limited to water and can be applied to various fluids.

〔Effect of the invention〕

As is clear from the above explanation, according to the fluid treatment device according to the present invention, in the first invention, the strength of the magnetic field acting on the passing fluid can be maintained constant according to the reference value, and the strength of the magnetic field acting on the passing fluid can be maintained constant according to the reference value. The strength of the magnetic field can be varied by changing the strength of the magnetic field, making it possible to obtain a magnetic field with a strength that produces the optimal processing effect depending on the usage situation, making it possible to create multiple types with different magnetic field strengths. There is no need to stock up on water treatment equipment, which makes management easier and can be provided at a lower cost.

In addition, in the second invention, since the strength of the magnetic field acting on the passing fluid is varied according to the flow rate of the passing fluid, it is possible to obtain a magnetic field with a strength that produces an optimal processing effect according to the flow rate. Therefore, the same effect as the first invention can be obtained.

Further, in the third invention, in addition to the effects of the first invention described above and the effects of the second invention described above, the minimum strength of the magnetic field acting on the passing fluid is ensured.

Furthermore, in addition to the effects of the first invention described above, the fourth invention makes it possible to provide the magnetic field generating means and the electromotive force detecting means at low cost.

Further, in the fifth invention, in addition to the effects of the second invention described above, it is possible to provide the magnetic field generating means and the flow velocity detecting means at low cost.

[Brief explanation of drawings]

FIG. 1 is an instrumentation diagram of a water treatment device showing one embodiment of the present invention (first invention), FIG. 2 is a more specific circuit configuration diagram of this water treatment device, and FIG. FIG. 4 is a schematic configuration diagram of a water treatment apparatus in which a magnetic field is applied also in the horizontal direction to a passing fluid. 1... Water supply and drainage pipe, Ll, L2... Excitation coil, 2.
...Current supply unit, 3...Differential amplifier, 4...Comparator, 5...Flow velocity detector. Figure 1 Figure 2 523-

Claims (5)

[Claims] (1) A magnetic field generating means for generating a magnetic field in a space through which a fluid passes, a current supply means for supplying an exciting current to the magnetic field generating means, and an electromotive force detecting means for detecting an electromotive force generated in the passing fluid by the generated magnetic field. and current control means for comparing the electromotive force detected by the electromotive force detection means with a variably determined reference value and controlling the excitation current according to the comparison result. (2) A magnetic field generating means for generating a magnetic field in a space through which the fluid passes, a current supply means for supplying an exciting current to the magnetic field generating means, and detecting the flow velocity based on the electromotive force generated in the passing fluid by the generated magnetic field. A fluid processing device comprising a flow velocity detection means and a current control means for controlling the excitation current according to the flow velocity detected by the flow velocity detection means. (3) A fluid treatment device according to claim 1 or 2, further comprising a limiter means for ensuring that the excitation current supplied by the current supply means is equal to or higher than a predetermined value. (4) A fluid processing device according to claim 1, characterized in that the magnetic field generating section and the electromotive force detecting section of an electromagnetic flowmeter are used as the magnetic field generating means and the electromotive force detecting means. (5) The fluid processing device according to claim 2, wherein the magnetic field generating unit and flow rate detecting unit of an electromagnetic flowmeter are used as the magnetic field generating unit and the flow rate detecting unit.