JP5572435B2 - Water treatment system - Google Patents

Description

  The present invention relates to an electromagnetic pump that compresses and discharges air by using an attractive force and a repulsive force between a permanent magnet and an electromagnet, and a water treatment system using the electromagnetic pump.

The electromagnetic pump vibrates the vibrator using the attractive force / repulsive force of the permanent magnet fixed to the vibrator and the electromagnet facing the permanent magnet, and the elasticity of the rubber diaphragm connected to the vibrator. By deformation, the air in the casing is compressed and discharged. The basic performance of the electromagnetic pump includes the amount of air, power consumption, driving sound, etc. under a predetermined discharge pressure, and there are restrictions on each performance depending on the device connected to the electromagnetic pump. Moreover, the power supply to an electromagnet is generally connected directly to a commercial power supply, and the voltage supplied to the electromagnet and the frequency thereof are naturally the same as those of the commercial power supply.
On the other hand, as an output control method for an electromagnetic pump, a method for controlling the output of a pump by switching a commercial AC power supply is disclosed (see Patent Document 1). The effect is that the excitation frequency of the diaphragm can be adjusted, thereby reducing noise, and by detecting external conditions and inputting the signal as a pump control signal, power saving can be achieved. It is mentioned that it can be achieved.

JP-A-7-103147

  Conventionally, various studies have been made on the method of controlling an electromagnetic pump, such as intermittent driving and pump driving below the rated operation by output control. In either case, the reduction of the air amount, which is the basic performance of the electromagnetic pump It leads to. In addition, since the frequency of the alternating current that drives the electromagnet is the frequency of the commercial power supply, it resonates with the vibration transmitted from the vibrator, and the drive sound increases. For this reason, it may lead to complaints about noise from neighboring residents.

  Furthermore, there are problems such as noise levels differing between regions with different frequencies of commercial power sources, and differences in basic specifications such as air volume and power consumption. As a countermeasure, there is a method of separately mounting an electromagnet according to the frequency of each region on each electromagnetic pump, but this increases the number of products and increases the development cost.

These electromagnetic pumps may be combined with a water treatment system such as a septic tank. In this case, there are not a few problems that the performance of the water treatment system differs due to the difference in frequency of the commercial power source between regions and the occurrence of voltage fluctuations in the commercial power source.
More specifically, regarding the septic tank, a circulating air lift pump that circulates the treated water to the pretreatment apparatus is mounted in most of the septic tanks currently in circulation.
The drive source of the circulating air lift pump is the air discharged from the electromagnetic pump, and the air as the drive source is branched and supplied from the air pipe connecting the electromagnetic pump to the air diffuser pipe of the aerobic treatment tank in the septic tank. Is done.

Here, the amount of air required for driving the circulating air lift pump is small compared to the amount of air (aeration) required for aerobic treatment. For example, in a septic tank for a detached house, the amount of aeration for aerobic treatment The driving air amount of the circulating air lift pump is about several L / min for several tens L / min.
The treatment water circulation greatly affects the treatment performance of the septic tank. If the circulation amount is too much relative to the inflow amount to the septic tank, the pretreatment function will be broken. Setting is difficult due to shortage. For this reason, in order to install the circulating air lift pump in the septic tank, it is necessary to carefully design the pipe diameter, pipe length, immersion rate, etc., but the most important factor is the amount of air. The increase or decrease of the circulation rate is proportional to the increase or decrease of the air amount. Fine adjustment of the air amount is performed by installing a valve in the air pipe. However, since there is a limit to this adjustment, a stable supply of air amount is desired.

  However, when the amount of air discharged from a conventional electromagnetic pump is large from several L / min due to differences in the frequency of commercial power supply (50 Hz and 60 Hz) in each region, voltage drop of the current supplied from the commercial power supply, etc. There was a fluctuation of more than a dozen L / min, and this fluctuation had a great influence on the function of the above-mentioned circulating air lift pump, and consequently had a great influence on the treatment performance of the septic tank.

  It should be noted that this problem can be solved by preparing a septic tank corresponding to each region, for example, a septic tank for 50 Hz in the 50 Hz district and a septic tank for 60 Hz in the 60 Hz district. As a result, production efficiency is poor, inventory management is increased, and the profits of septic tank manufacturers are under pressure. Moreover, in the area where 50 Hz and 60 Hz are mixed, there is a possibility that septic tanks for 50 Hz area and 60 Hz area may be installed by mistake, and it is not realistic to prepare two types for 50 Hz area and 60 Hz area.

In recent years, many septic tanks having a flow rate adjusting function have been produced. For this flow rate adjustment, a flow rate adjustment air lift pump is often used, and there is a concern similar to the above-described circulation air lift pump.
In addition to these septic tanks, the variety of systems connected to electromagnetic pumps is increasing year by year, but even if there is a slight difference in the amount of air required, an assortment of products with different electromagnet specifications is required each time. Therefore, it is difficult to standardize electromagnetic pumps.
Furthermore, the demand for energy saving performance for the realization of a low-carbon recycling society is increasing year by year, and it is desirable to reduce the power consumption of electromagnetic pumps as well as securing the air volume and reducing the driving noise described above. It is where

  The present invention has been proposed in view of such a conventional situation, and even when used in an area where the driving sound is small and the frequency of the commercial power source is different, the same performance can be obtained. An object of the present invention is to provide an electromagnetic pump that is not easily affected even when the voltage of a commercial power supply is lowered, and a water treatment system using the same.

The present invention has the following configuration in order to solve the above problems.
(1) A pump chamber having a diaphragm, a vibrator attached to the diaphragm, a permanent magnet fixed to the vibrator, and an electromagnet facing the permanent magnet, and supplying an alternating current to the electromagnet An electromagnetic pump that compresses and discharges air in the pump chamber by oscillating the vibrator by the attractive force and repulsive force between the magnetic force lines generated by the magnetic field and the magnetic force lines of the permanent magnet, thereby deforming the diaphragm. The frequency of the alternating current supplied to the electromagnet is different from the frequency of the alternating current supplied from the commercial power source, and the driving sound is smaller than when the alternating current from the commercial power source is directly supplied to the electromagnet. An electromagnetic pump characterized by being set to a frequency of
(2) An alternating current supplied to the electromagnet having a plurality of voltage patterns with different duty ratios as an option for a voltage pattern of alternating current supplied to the electromagnet, and arbitrarily selecting one voltage pattern from these voltage patterns The electromagnetic pump according to (1), wherein the electromagnetic pump can be set as a voltage pattern.
(3) As a voltage pattern option of the alternating current supplied to the electromagnet, a plurality of voltage patterns having different duty ratios are provided, and one of these voltage patterns is selected according to the voltage value of the alternating current supplied from the commercial power source. The electromagnetic pump according to (1) or (2), wherein the voltage pattern is selected and set as a voltage pattern of an alternating current supplied to the electromagnet.

(4) A water treatment system comprising the electromagnetic pump according to any one of (1) to (3), wherein the electromagnetic pump is connected to a water treatment tank.
(5) The electromagnetic pump according to (2), wherein the electromagnetic pump has a plurality of different duty cycles depending on the capacity of the water treatment tank as an option of a voltage pattern of an alternating current supplied to the electromagnet. (4), having a voltage pattern, wherein one voltage pattern can be arbitrarily selected from these voltage patterns and can be set as a voltage pattern of an alternating current supplied to the electromagnet. Water treatment system.
Further, in the water treatment system according to the above (1), (2), (4), (5), a pump chamber having a diaphragm, a vibrator attached to the diaphragm, and a fixed to the vibrator A permanent magnet, and an electromagnet facing the permanent magnet, wherein the vibrator is vibrated by an attractive force and a repulsive force between a magnetic force line generated by supplying an alternating current to the electromagnet and a magnetic force line of the permanent magnet. A water treatment system comprising an electromagnetic pump that deforms a diaphragm and thereby compresses and discharges air in the pump chamber, wherein the electromagnetic pump is connected to a water treatment tank and supplied to the electromagnet Is different from the frequency of the alternating current supplied from the commercial power source, and the driving sound is higher than when the alternating current from the commercial power source is directly supplied to the electromagnet. The voltage pattern is configured to be set to a frequency that becomes low and has a plurality of voltage patterns with different duty ratios according to various capacities of the water treatment tank as options for the voltage pattern of the alternating current supplied to the electromagnet, and these voltage patterns One voltage pattern can be arbitrarily selected and set as a voltage pattern of an alternating current supplied to the electromagnet.

The electromagnetic pump according to the present invention converts the alternating current supplied from the commercial power source into a frequency that reduces the driving sound and supplies it to the electromagnet, so that the driving sound can be greatly reduced. For this reason, it is not necessary to drive by reducing the output according to the region and time zone, and stable operation can be obtained without worrying about noise.
Further, it is possible to set a frequency with good energy efficiency in accordance with the specifications of the electromagnetic pump. Thereby, it can contribute also to the energy saving of the apparatus to which this electromagnetic pump is applied, without sacrificing the amount of air.

  In addition, as a choice of voltage patterns to be applied to the electromagnet, it has a plurality of voltage patterns with different duty cycles, and converts the alternating current supplied from the commercial power source into the selected voltage pattern (pulse width modulation) to the electromagnet In the case of the supply configuration, the air discharge amount can be variously changed depending on the voltage pattern as an option and the selection method. Thereby, the air discharge amount can be switched according to the application, and can be applied to various systems with one electromagnetic pump.

  Also, the voltage pattern (duty cycle) applied to the electromagnet is determined according to the voltage value of the commercial power supply, and the alternating current supplied from the commercial power supply is converted into the determined voltage pattern (pulse width modulation) If the commercial power supply has a voltage fluctuation, the duty cycle is changed accordingly, and the fluctuation in the discharge air volume due to the voltage fluctuation is offset and the predetermined discharge air volume is maintained. can do. This not only stabilizes the performance of the electromagnetic pump, but also improves the quality of the entire system to which the electromagnetic pump is connected.

In addition, according to the present invention, the water treatment system is connected to the septic tank as described above, so that the noise level is reduced, and the air volume is increased and the power consumption is reduced due to the recent downsizing. It can cope with difficult tasks. Furthermore, since a plurality of air volumes can be set with the same electromagnetic pump, it is possible to integrate pumps that have been different for each conventional tank. In addition, one electromagnetic pump can be used for multiple applications such as aeration and backwashing, and it is easy not only to change the air volume for each application, but also to easily finely adjust the air volume. The quality controllability is excellent.
In addition, there is no need to consider performance differences due to differences in commercial power supply frequency during development, leading to a significant reduction in development costs.

It is a schematic diagram which shows the electromagnetic pump of 1st Embodiment of this invention. It is a block diagram which shows the structure of the drive current control means with which the electromagnetic pump shown in FIG. 1 is provided. It is a figure which shows the relationship between the drive frequency and drive sound of an electromagnetic pump. It is a figure which shows an example of the voltage pattern applied to an electromagnet. It is a block diagram which shows the structure of the drive current control means with which the electromagnetic pump of 2nd Embodiment is provided. It is a figure which shows the other example of the voltage pattern applied to an electromagnet. It is a block diagram which shows the structure of the drive current control means with which the electromagnetic pump of 3rd Embodiment is provided. It is a figure which shows the further another example of the voltage pattern applied to an electromagnet. It is a schematic diagram which shows an example of the water treatment system to which the electromagnetic pump of this invention was applied. It is a figure which shows the relationship between the discharge pressure and discharge air volume of the electromagnetic pump of this invention, and the operating range and required air volume range of the water treatment system shown in FIG. It is a figure which shows the relationship between the discharge pressure and discharge air volume of the conventional electromagnetic pump, and the operation range and required air volume range of the water treatment system shown in FIG. It is a figure which shows the relationship between the discharge pressure of the electromagnetic pump of this invention, and power consumption value, and the operating range and power consumption value setting range of the water treatment system shown in FIG. It is a figure which shows the relationship between the discharge pressure and power consumption value of the conventional electromagnetic pump, and the operation range and power consumption value setting range of the water treatment system shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<First Embodiment>
First, a first embodiment of the electromagnetic pump of the present invention will be described.
FIG. 1 is a schematic diagram showing a first embodiment of an electromagnetic pump according to the present invention, FIG. 2 is a block diagram showing drive current control means provided in the electromagnetic pump shown in FIG. 1, and FIG. The figure which shows the relationship between a drive frequency and a drive sound, FIG. 4 is a figure which shows an example of the voltage pattern applied to an electromagnet.
The electromagnetic pump 1 shown in FIG. 1 is provided with a pump drive unit 40, a pair of pump chambers 41 and 41 that are provided on both sides of the pump drive unit 40, and sucks and discharges air, and an AC current supplied from a commercial power source. Drive current control means (printed wiring board) 22 for converting the frequency into a set frequency (set frequency) is provided.

  Each pump chamber 41, 41 is attached to a casing 43, which will be described later. In each side wall of each pump chamber 41, 41, a suction port 5 for sucking outside air, a suction valve 6 for opening and closing the suction port 5, a discharge port 7 for discharging air in the pump chamber 41, A discharge valve 8 for opening and closing the discharge port 7 is provided. In addition, a disc-shaped diaphragm 4 is provided inside each pump chamber 41, 41 so as to face each side wall. In each pump chamber 41, 41, an air accommodating space 11 in which air is accommodated is defined by each side wall and each peripheral wall and each diaphragm 4, 4. Each of the diaphragms 4 and 4 is made of a rubber material, and is elastically deformed so that its substantially central portion alternately protrudes inward or outward of the pump chamber 41 by an operation of a pump drive unit 40 described later. As a result, the air in each pump chamber 41, 41 is compressed and expanded, the air in the pump chamber 41 is discharged from the discharge port 7 during compression, and the outside air is sucked into the pump chamber 41 from the suction port 5 during expansion. Is done.

  The pump drive unit 40 is disposed up and down with the vibrator 3 whose both ends are connected to the center of each diaphragm 4, 4, the permanent magnet 10 fixed to the vibrator 3, and the vibrator 3. A pair of electromagnets 9 and 9 is provided, and the magnetic poles of the electromagnets 9 and 9 on the vibrator 3 side and the magnetic poles of the permanent magnet 10 face each other. Each part constituting the pump drive unit 40 is accommodated in the casing 43 except for both ends of the vibrator 3.

  An alternating current (driving current) is supplied to the electromagnets 9 and 9 from the driving current control means 22 to be described later. When a drive current is supplied to each electromagnet 9, lines of magnetic force are generated around each electromagnet 9, 9 by alternately changing the direction in a cycle corresponding to the frequency of the drive current. The vibrator 3 reciprocates left and right by the attractive force / repulsive force between the magnetic lines and the magnetic lines of the permanent magnet 10, and the central portions of the diaphragms 4 and 4 alternately protrude inward or outward in directions opposite to each other.

  The drive current control means 22 is connected to the commercial power supply 20 and the electromagnet 9, converts the alternating current supplied from the commercial power supply 20 into a frequency (set frequency) set by the operator, and supplies the electromagnet 9. As shown in FIG. 2, the drive current control unit 22 includes a frequency setting unit 24, a frequency adjustment unit 25, and a frequency conversion unit 28.

The frequency setting unit 24 includes a microcomputer 23, and controls the operation of the frequency conversion unit 28 based on frequency data (set frequency) written in the storage unit (ROM).
Here, in the present invention, this set frequency is a frequency at which the driving sound is smaller when the electromagnet is driven at that frequency than when the electromagnet is driven at the frequency of the commercial power source. Specifically, the set frequency can be obtained as an optimum value from experimental data as follows.

FIG. 3 shows the relationship between the drive frequency and the drive sound when the power consumption and the discharge pressure are constant in the electromagnetic pump 1 shown in FIGS.
As is clear from the relationship shown in FIG. 3, it can be seen that driving noise can be reduced when driving at a lower frequency than when driving at a frequency of commercial power, that is, 50 Hz or 60 Hz. Accordingly, the set frequency is set to less than 50 Hz when the frequency of the commercial power supply is 50 Hz, and set to less than 60 Hz when the frequency of the commercial power supply is 60 Hz, for example, set to 43 Hz (cycle: 23.3 msec). Is preferred.
In the ROM of the frequency setting unit 24, a suitable frequency that has been obtained in advance through experiments or the like may be written, and a frequency adjustment unit 25 that is manually adjusted by the operator as in the present embodiment. The frequency data adjusted by the frequency adjusting unit 25 may be written to the ROM as needed.

Specifically, the frequency adjustment unit 25 includes a plus button 26a and a minus button 26b that are pressed by an operator to adjust the frequency, and a display unit 27 that displays the adjusted frequency. The frequency data adjusted by the frequency adjusting unit 25 is input to the frequency setting unit 24 and written in the ROM.
The frequency conversion unit 28 is connected to the commercial power source 20 and the electromagnet 9, and converts the alternating current supplied from the commercial power source 20 into a set frequency set in the frequency setting unit 24 under the control of the frequency setting unit 24. The electromagnet 9 can be supplied.

Next, the operation of the electromagnetic pump 1 will be described.
In this embodiment, the voltage AC100V is supplied to the electromagnetic pump, but the voltage value is not particularly limited. The frequency of the commercial power supply 20 is 50 Hz or 60 Hz in Japan, and varies depending on the power supply situation in each region.
FIG. 4 is a voltage waveform diagram (voltage pattern) applied to the electromagnet 9 in the present embodiment, and the set frequency is 43 Hz. Note that the voltage pattern and the power supply frequency are not limited to this, and may be set as appropriate in consideration of the specifications of the electromagnet, other performance, and the like.

First, the power cord 21 derived from the drive current control means 22 is connected to the commercial power source 20.
Next, the operator operates the buttons 26a and 26b of the frequency adjusting unit 25 to adjust the set frequency. The set frequency adjusted by the frequency adjusting unit 25 is input to the frequency setting unit 24 and written in the ROM.
Next, the operation of each part is turned ON. As a result, an alternating current is supplied from the commercial power supply 20 to the drive current control means 22.
The alternating current supplied to the drive current control means 22 is converted into a set frequency (43 Hz) by the operation of each part constituting the drive current control means 22 and supplied to the electromagnet 9. Around the electromagnet 9 supplied with an alternating current, magnetic lines of force are generated by alternately changing the direction, and the vibrator 3 reciprocates left and right due to the attractive and repulsive forces between the magnetic lines and the magnetic lines of the permanent magnet. The center portions of the diaphragms 4 and 4 alternately protrude inward or outward in directions opposite to each other. As a result, the air in each pump chamber 41, 41 is compressed / expanded, the air in the pump chamber 41 is discharged from the discharge port 7 during compression, and the outside air is sucked into the pump chamber 41 from the suction port 5 during expansion. Is done.

In the electromagnetic pump 1 as described above, a frequency from which the resonance point with the electromagnet 9 and the casing 43 is removed is set as the drive frequency, thereby reducing the vibration sound transmitted from the vibrator 3 and the vibrator 3. be able to.
Moreover, since the alternating current supplied from the commercial power source 20 is converted into a set frequency and supplied to the electromagnet 9, similar characteristics can be obtained even in regions where the commercial power source 20 has different frequencies. Table 1 shows experimental data specifically showing this effect.
Table 1 shows the characteristics of the electromagnetic pump of this embodiment (set frequency 43 Hz) and the electromagnetic pump in which the electromagnet is directly driven by a commercial power source (50 Hz or 60 Hz).

As described above, when the electromagnet 9 is directly driven by a commercial power source (frequency: 50 Hz or 60 Hz), a difference occurs in driving sound and air amount. On the other hand, in the configuration of the present embodiment in which the alternating current from the commercial power supply 20 is converted into a set frequency by the frequency conversion unit and supplied to the electromagnet, a constant frequency (this implementation is performed) regardless of the frequency of the commercial power supply. Since the electromagnet can be driven at 43 Hz in the form, the noise amount and the air amount can be made constant irrespective of the commercial frequency. For this reason, it is not necessary to prepare a plurality of specifications (number of coil turns, coil wire diameter) of the electromagnet 9 for each region where the frequency of the commercial power supply is different, and high practicality can be obtained. In addition, the driving sound can be suppressed to be lower than that in the case of direct driving at any commercial frequency.
Furthermore, regarding the power consumption, it is possible to set a suitable driving frequency that reduces the power consumption in accordance with the specifications of the electromagnet 9, so that an effect of contributing to energy saving can be obtained.

Second Embodiment
Next, a second embodiment of the electromagnetic pump of the present invention will be described.
FIG. 5 is a block diagram showing drive current control means provided in the electromagnetic pump of the second embodiment, and FIG. 6 is a diagram showing another example of a voltage pattern applied to the electromagnet.
Hereinafter, the electromagnetic pump according to the second embodiment will be described. The description will focus on differences from the first embodiment, and the description of those components will be omitted for the same components.

In the structure of this embodiment, the voltage pattern applied to the electromagnet has a plurality of voltage patterns with different duty cycles, and the drive current control means uses the frequency of the alternating current supplied from the commercial power supply as the set frequency. The electromagnetic pump according to the first embodiment except that the AC pump is configured to convert the voltage pattern of the alternating current supplied from the commercial power source into a voltage pattern selected by the operator (pulse width modulation). This is the same as the structure.
Here, the duty cycle is the ratio of the pulse width to the pulse period.
In addition, here, a case where the pattern A and the pattern B shown in FIG. 6 are used as the voltage pattern applied to the electromagnet will be described as an example.

As shown in FIG. 5, the drive current control means 22 includes a frequency setting unit 24 and a frequency adjustment unit 25, air amount changeover switches 31 a and 31 b, a pattern detection unit 30 and a pulse width setting unit 29, and a frequency conversion unit 28. It has.
The configurations of the frequency setting unit 24 and the frequency adjustment unit 25 are the same as those in the first embodiment.
The air amount change-over switches 31a and 31b are operated by the operator according to the selected voltage pattern. When the pattern A is selected, the switch 31a is turned on, the switch 31b is turned off, and the pattern B is selected. In this case, the switch 31a is turned off and the switch 31b is turned on.

The pattern detection unit 30 detects the ON / OFF state of each switch 31a, 31b, and recognizes the voltage pattern selected by the operator based on this. The voltage pattern recognized by the pattern detection unit is input to the pulse width setting unit 29.
The pulse width setting unit 29 determines the duty cycle from the voltage pattern input from the pattern detection unit 30, and controls the operation of the frequency conversion unit 28 based on this. That is, when the input voltage pattern is pattern A, the duty cycle of the output voltage pattern is 60%, and when it is pattern B, the duty cycle of the output voltage pattern is 60%. The operation of the frequency conversion unit 28 is controlled so as to be 70%.

  The frequency conversion unit 28 is connected to the commercial power supply 20 and the electromagnet 9, and the alternating current supplied from the commercial power supply 20 is set in the frequency setting unit 24 under the control of the frequency setting unit 24 and the pulse width setting unit 29. The duty cycle determined by the set frequency and pulse width setting unit 29 is converted and supplied to the electromagnet 9.

Also in the second embodiment, the same operation and effect as the first embodiment can be obtained.
In the electromagnetic pump according to the second embodiment, in particular, the frequency of the alternating current supplied from the commercial power supply 20 is converted into a set frequency, and the operator selects the voltage pattern of the alternating current supplied from the commercial power supply 20. By converting the voltage pattern (duty cycle) into the electromagnet 9 and supplying it to the electromagnet 9, the following effects can be obtained. Table 2 shows the relationship between the selected voltage pattern and the amount of air discharged by the pump unit.

  As described above, when the duty cycle of the voltage pattern applied to the electromagnet 9 is increased or decreased, the vibration of the vibrator 3 is changed, and as a result, the amount of air discharged from the pump unit 41 is increased or decreased. That is, the discharge air amount can be controlled by changing the voltage pattern applied to the electromagnet 9. As a result, it is possible to compensate for a decrease in the amount of discharge air due to a voltage drop of the commercial power supply 20, and to obtain an effect of obtaining an optimum discharge air amount according to the application.

  In the present embodiment, the air amount changeover switches 31a and 31b are provided on the printed wiring board of the drive current control means 22 to switch the on-time (voltage pattern). However, the voltage pattern changeover means is limited to this. Instead of this, the pattern may be switched by remote operation such as using an infrared signal from a remote controller or the like. ]

<Third Embodiment>
Next, a third embodiment of the electromagnetic pump of the present invention will be described.
FIG. 7 is a block diagram showing drive current control means provided in the electromagnetic pump of the third embodiment, and FIG. 8 is a diagram showing still another example of a voltage pattern applied to the electromagnet.
Hereinafter, although the electromagnetic pump concerning 3rd Embodiment is demonstrated, it demonstrates centering around difference with the said 1st Embodiment, and the description is abbreviate | omitted about the same matter.

  This embodiment has a plurality of voltage patterns with different duty cycles as options of voltage patterns to be applied to the electromagnet, and the drive current control means converts the frequency of the alternating current supplied from the commercial power source to the set frequency. Aside from being configured to determine the voltage pattern according to the voltage value of the commercial power source and convert the voltage pattern of the alternating current supplied from the commercial power source to the determined voltage pattern (pulse width modulation), The same as in the first embodiment.

As shown in FIG. 7, the drive current control unit 22 includes a frequency setting unit 24 and a frequency adjustment unit 25, a zero-cross detection circuit 33, a voltage detection unit 34 and a pulse width setting unit 29, and a frequency conversion unit 28. Yes.
The configurations of the frequency setting unit 24 and the frequency adjustment unit 25 are the same as those in the first embodiment.
The zero cross detection circuit 33 is connected to the commercial power supply 20, reads the voltage waveform of the commercial power supply 20, and outputs the voltage waveform to the voltage detection unit 34.

The voltage detection unit 34 detects the voltage value of the commercial power source 20 based on the voltage pattern input from the zero cross detection circuit 33 and outputs this voltage data to the pulse width setting unit 29. In the present embodiment, the voltage detection unit 34 is configured to detect a voltage range of AC85 to 110V while the normal voltage of the commercial power supply 20 is AC100V.
The pulse width setting unit 29 determines the duty cycle based on the correspondence relationship between the preset voltage data and the duty cycle and the voltage data input from the voltage detection unit 34, and based on this, the frequency conversion unit 28. To control the operation.

  The frequency conversion unit 28 is connected to the commercial power source 20 and the electromagnet 9, and the alternating current supplied from the commercial power source 20 is set in the frequency setting unit 25 under the control of the frequency setting unit 24 and the pulse width setting unit 29. The duty cycle determined by the set frequency and pulse width setting unit 29 is converted and supplied to the electromagnet 9.

Also in the third embodiment, the same operation and effect as in the first embodiment can be obtained.
In the electromagnetic pump 1 according to the third embodiment, in particular, the frequency of the alternating current supplied from the commercial power source 20 is converted into a set frequency, and the voltage pattern (duty cycle) according to the voltage value of the commercial power source 20. Is automatically determined, and the duty cycle of the alternating current supplied from the commercial power supply 20 is converted into the determined duty cycle and supplied to the electromagnet 9, whereby the voltage of the commercial power supply 20 is determined. When the air pressure fluctuates, the duty cycle changes accordingly, and an effect that a substantially constant air discharge amount can be obtained is obtained. This effect will be described based on a specific example.
Table 3 shows an example of the relationship between the voltage of the commercial power source 20, the duty cycle of the alternating current supplied to the electromagnet, and the discharge air amount.

In the electromagnetic pump 1 having such characteristics, for example, in the pulse width setting unit 29, as a correspondence relationship between the voltage data and the duty cycle, AC100V−duty cycle 60%, AC95% −duty cycle 70% are set. Set.
In this case, when the commercial power supply 20 is the normal voltage AC100V, the alternating current supplied from the commercial power supply 20 is converted into a voltage pattern (duty cycle: 60%) as shown by the chain line in FIG. ) And supplied to the electromagnet 9. At this time, the discharge air amount is 80 L / min.
On the other hand, if the voltage of the commercial power supply 20 is lowered to 95 V due to power circumstances, the peak value is also lowered due to the influence. Therefore, if the duty cycle remains 60%, the amount of air discharged from the pump unit 41 is reduced. (73 L / min). On the other hand, in the present embodiment, since the pulse width setting unit 29 sets the duty cycle to 70% based on the detected voltage, the alternating current supplied from the commercial power source 20 is indicated by a solid line in FIG. It is converted into a voltage pattern as shown and supplied to the electromagnet. As a result, the discharge air amount is increased as compared with the case of the duty cycle of 60%, and a discharge air amount (80 L / min) equivalent to that in the case of AC 100 V is obtained.
In the present embodiment, in addition to the above settings, the pulse width setting unit 29 may be set so that the duty cycle decreases when the voltage of the commercial power supply 20 becomes higher than normal. Good.

<Configuration of septic tank>
Next, the purification layer to which the electromagnetic pump of the present invention is applied will be described.
FIG. 12 shows one of the embodiments in which the electromagnetic pump of the present invention and a septic tank which is a typical example of a water treatment tank are combined.

  The septic tank 100 includes an anaerobic treatment tank first chamber 110, an anaerobic treatment tank second chamber 120, an aerobic treatment tank 130, a sedimentation tank 140, and a disinfection tank 150. The anaerobic treatment tank second chamber 120 has a flow rate adjusting air lift pump 121. And a circulating air lift pump 132 is installed in the settling tank 140. The electromagnetic pump 1 and the septic tank 100 are connected by air piping. In the septic tank 1, the air pipe is branched into three, one connected to the air diffuser 131 of the aerobic treatment tank 130, one connected to the flow adjustment air lift pump 121, and the other connected to the circulating air lift pump 132.

  The sewage flowing into the septic tank 100 is subjected to solid-liquid separation and anaerobic treatment in the anaerobic treatment tank first chamber 110 and the anaerobic treatment tank second chamber 120, and is transferred to the aerobic treatment tank 130 by the flow rate adjusting air lift pump 121. The upper part of the anaerobic treatment tank first chamber 110 and the anaerobic treatment tank second chamber 120 is a flow rate adjustment region, and the water level fluctuates from a high water level (HWL) to a low water level (LWL). The treated water subjected to the aerobic treatment in the aerobic treatment tank 130 is separated into solid and liquid again in the precipitation tank 140, and the supernatant water is sent to the disinfection tank 150 and sterilized, and then flows out of the septic tank 100.

Further, the nitrogen component nitrified in the aerobic treatment tank 130 is sent from the settling tank 140 to the anaerobic treatment tank first chamber 110 by the circulation air lift pump 132, and is removed by denitrification reaction.
The amount of air required for each device varies depending on various conditions. For example, if the loss of 4 L / min of the air piping connecting the electromagnetic pump 1 and the septic tank 100 is excluded, the intermediate water level (intermediate between HWL and LWL) Thus, the air diffuser 131 is 34 L / min, the flow rate adjusting air lift pump 121 is 7 L / min, and the circulating air lift pump 132 is 5 L / min.

  Valves for adjusting the amount of air are respectively installed in the air pipes branched into the flow rate adjusting air lift pump 121 and the circulation air lift pump 132. However, since the air volume passing through the valve is about several L / min, the air volume is too small and adjustment is difficult. Therefore, a “throttle” called an orifice (not shown) is installed in front of the valve to reduce the air volume in advance and reduce the burden on the valve. Specifically, an orifice of φ2.0 is installed for each pipe inner diameter φ13.

  In the case of a low water level (LWL), the immersion rate of the flow rate adjusting air lift pump 121 is reduced, the pumping efficiency is deteriorated and the water supply amount is reduced, but the actual water depth of the air discharge pipe (not shown) is shallow, so the amount of air Increases to 11 L / min. At that time, the air quantity to the other was 31 L / min for the air diffuser 131 and 4 L / min for the circulating air lift pump 121.

In the case of a high water level (HWL), the immersion rate of the flow rate adjusting air lift pump 121 is increased, the pumping efficiency is improved and the water supply amount is increased, but the actual water depth of the air discharge pipe is increased, so the air amount is reduced, 6L / min. The amount of air to other devices at that time was 35 L / min for the air diffuser 131 and 5 L / min for the circulating air lift pump 121.
In this embodiment, the air amount of the circulating air lift pump 121 was stable at 4 to 5 L / min even when the water level fluctuated.

  In the conventional electromagnetic pump, the air discharge amount may vary by more than a dozen L / min depending on the frequency of the commercial power supply (50 Hz and 60 Hz), and the air distribution to each of the air lift pumps 121 and 132 and the air diffuser 131 is performed. There are cases in which the expected range is greatly deviated. On the other hand, in the electromagnetic pump 1 of the present invention, an alternating current of 43 Hz is supplied to the electromagnet regardless of the frequency of the commercial power source. For this reason, the stable air discharge of discharge amount 50L / min vicinity is realizable, and the septic tank can also show the stable performance.

In the conventional electromagnetic pump, the air discharge amount may be reduced by several L / min due to voltage fluctuation of the commercial power source. However, when the electromagnetic air pump of the present invention is configured to constantly monitor the voltage of the commercial power supply and correct the voltage applied to the electromagnet by pulse width modulation (configuration of the third embodiment), the discharge amount is 50 L / Stable air discharge in the vicinity of the minute can be realized, so that the septic tank can also provide stable performance.
In this embodiment, the flow adjustment air lift pump 121 is installed, but the same applies to the case where the flow adjustment air lift pump 121 is not installed.

  The required capacity of the septic tank 100 varies depending on the amount of treated water and the quality of the treated water, and naturally the air discharge amount required for the electromagnetic pump varies accordingly. Moreover, in the general household septic tank, the capacity of the septic tank main body differs depending on the 5-person tank, the 7-person tank, etc., and the minimum air amount required for the electromagnetic pump differs accordingly. When the electromagnetic pump of the present invention is connected, it is possible to freely increase or decrease the air discharge amount by adopting a configuration that switches the duty cycle (configuration of the second embodiment). Table 4 shows an example of the capacity of the septic tank (human tank), the corresponding duty cycle (duty cycle set in the pulse setting unit), and the air discharge amount in that case.

10 and 11 show the relationship between the discharge pressure and the discharge air volume when the electromagnetic pump is connected to the septic tank, FIG. 10 shows the case of the electromagnetic pump of the present invention, and FIG. 11 shows the case of the conventional electromagnetic pump. It is. When the conventional electromagnetic pump is connected to the septic tank, the discharge air volume with respect to the discharge pressure differs depending on the frequency of the commercial power supply (50 Hz and 60 Hz), whereas the electromagnetic pump of the present invention is connected to the septic tank. Can obtain a constant discharge air volume with respect to the discharge pressure regardless of the frequency of the commercial power source. In addition, operation within the original required air volume range is possible, and the water quality is stabilized.
12 and 13 show the relationship between the discharge pressure and the power consumption when the electromagnetic pump is connected to a septic tank. FIG. 12 shows the electromagnetic pump of the present invention, and FIG. 13 shows the conventional electromagnetic pump. Is the case. Since the electromagnetic pump of the present invention can be appropriately set to an efficient driving frequency, power consumption can be greatly reduced as compared with the conventional one.
The electromagnetic pump and the water treatment system of the present invention have been described above, but in each embodiment, each part constituting the electromagnetic pump and the water treatment system, specific numerical values are examples, and depart from the scope of the present invention. It can change suitably in the range which does not.

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic pump, 2 ... Power cord, 3 ... Vibrator, 4 ... Diaphragm, 5 ... Suction port, 6 ... Suction valve, 7 ... Discharge port, 8 ... Discharge valve, 9 ... Electromagnet, 10 ... Permanent magnet, 11 DESCRIPTION OF SYMBOLS ... Air accommodation space, 20 ... Commercial power supply, 22 ... Drive current control means, 23 ... Microcomputer, 24 ... Frequency setting part, 25 ... Frequency adjustment part, 26a ... Plus button, 26b ... Minus button, 27 ... Display part, 28 DESCRIPTION OF SYMBOLS ... Frequency conversion part, 29 ... Pulse width setting part, 30 ... Pattern detection part, 31a 31b ... Air quantity changeover switch, 33 ... Zero cross detection circuit, 34 ... Voltage detection part, 40 ... Pump drive part, 41 ... Pump chamber, 43 ... casing, 100 ... septic tank, 110 ... anaerobic treatment tank first chamber, 120 ... anaerobic treatment tank second chamber, 121 ... flow adjustment air lift pump, 130 ... aerobic treatment tank, 131 ... air diffuser, 132 ... Ring air lift pump, 140 ... sedimentation tank, 150 ... disinfecting bath

Claims (1)

A pump chamber having a diaphragm, a vibrator attached to the diaphragm, a permanent magnet fixed to the vibrator, and an electromagnet facing the permanent magnet, and generated by supplying an alternating current to the electromagnet A water treatment system including an electromagnetic pump that deforms the diaphragm by vibrating the vibrator by an attractive force and a repulsive force between a magnetic field line and a magnetic field line of the permanent magnet, thereby compressing and discharging the air in the pump chamber Because
The electromagnetic pump is connected to a water treatment tank,
The frequency of the alternating current supplied to the electromagnet is different from the frequency of the alternating current supplied from a commercial power supply, and the driving sound is smaller than when the alternating current from the commercial power supply is directly supplied to the electromagnet. Configured to set the frequency ,
As a choice of voltage pattern of alternating current supplied to the electromagnet, it has a plurality of voltage patterns with different duty ratios according to various capacities of the water treatment tank, and arbitrarily selects one voltage pattern from these voltage patterns, It is comprised so that it can set as a voltage pattern of the alternating current supplied to the said electromagnet, The water treatment system characterized by the above-mentioned.

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