JP3755723B2 - Control system for filtration equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a control system for a filtration apparatus in which a power source for a pump motor in the filtration apparatus is controlled by an inverter to reduce power consumption and improve filtration accuracy.
[0002]
[Prior art]
Generally, the inverter is not attached to the filtration apparatus of a bathtub or a pool. Further, the filtering device is planned in accordance with the peak of busy periods such as Saturday and Sunday, and a design capable of sufficiently filtering the dirt on the peak is required. In other words, the same circulating water volume and pump capacity are used uniformly during times other than the peak or on weekdays.
On the other hand, the selection method of the conventional filtration pump selects any pump of 2.2 kw, 3.7 kw, 5.5 kw, 7.5 kw, 11 kw, 18.5 kw or more about 1.5 kw or more, for example. As a result, the higher-grade model always has a large amount of power of 150 to 170%. Therefore, a method of selecting a pump that is as small as possible over a set value and reducing the flow rate with a valve is usually used. For example, if the actual required capacity is 7.5kw, which is slightly insufficient, there is no choice but to select 11kw, and there is a dilemma that there is no choice but to select a pump with high power consumption for each stage of advanced models. ing. Currently, this is an unavoidable choice due to the small number of pump motors.
Further, in order to save the power of the filtration pump, measures such as stopping at night are taken.
[0003]
[Problems to be solved by the invention]
In general, the reason why inverters are not used in filtration pumps is that sand filtration, which is the most common filtration method, has a function of washing filter media such as backwashing and washing, and the number of revolutions is uniform. Alternatively, if the flow rate is reduced, there is a functional problem that the filter medium is not sufficiently restored. Conventionally, it has not been familiar to simply use an inverter for such a filtration facility.
Moreover, it is well known that there is no concept of saving electricity in such a filtration pump in the industry in the first place, and it is known that a certain amount of electricity charges will be applied. On the contrary, there are many cases in which driving is performed before use the next day without sufficiently passing the filtration time.
[0004]
[Means for Solving the Problems]
The present invention uses an inverter for the filtration pump for the purpose of saving electric power, and uses a weekly or 24-hour timer to divide the peak time from the time zone and day of the week when the load is low, making the inverter adjustable in stages. Designed to be switched to conventional commercial operation at any time.
In addition, the filtration, backwashing, and washing signals are taken out from the filtration device so that a sufficient amount of pump water can be secured when necessary. This signal can be normally extracted from the connection terminal of the switching valve of the panel.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
The basic structure is that the program for changing the frequency of the motor power supply step by step with the inverter is controlled by the (1) operation indicator and (6) programmable controller in FIG. 1, and via the electromagnetic contactor (8). This system controls the number of rotations of the pump.
[0006]
In this device, two types of bath and pool that are used differently are set, and each inverter control is set to about 5 to 10 patterns. In general, it is divided into daytime and nighttime on Saturdays and Sundays, daytime and nighttime on weekdays, and the frequency value is controlled between 100% and about 15% by an inverter. The frequency and the number of revolutions are proportional, and the amount of power can be greatly reduced just by reducing the flow rate.
This is a device that has been considered by taking full advantage of the characteristics of this motor.
According to actual measurement data, when the flow rate is approximately 70%, the power amount ratio is 40%, and when the flow rate is 50%, the power amount ratio is 22%. Then, the flow rate is changed according to the time of day and the day of the week, and it is controlled finely to reduce power.
[0007]
At the time of backwashing or a washing process, it is set so that the pump can operate at 100% of the conventional value. In the manual method, the operation is returned to commercial use, and in the automatic method, a signal is taken out from a switching valve or a control panel and incorporated in the control. In other words, even during energy saving operation by the inverter, if backwashing is urgently performed, the system immediately returns to the original 100% operation. These are all programmed with the optimal menu at the time of shipment, and timers for daytime and nighttime can be set in weekday and weekend modes.
In addition, many large pumps are actually set, and the flow rate is usually reduced by restricting with a valve. The electric power in such a case is increased on the contrary by the load applied, and it is possible to reduce the overall power by suppressing the normal operation.
[0008]
When using this in the structure as described above, the program is set so that it is backwashed immediately after the end of energy saving operation. This is because during the energy saving operation, the flow rate is reduced and the filtration speed is slowed down, so that the filtration accuracy is improved and dirt that cannot be usually removed is caught.
Therefore, backwashing before returning to normal high-speed operation takes advantage of another feature of the apparatus.
Originally, this device is ideally incorporated into a filtration device, but as a variation, it can be applied to any existing filtration device, so that it can be installed next to the current equipment.
[0009]
【The invention's effect】
The effects of the present invention are broadly divided into the following two points.
B) Energy saving of filtration pump, reduction of electricity charges b) Efficient filtration
B) The characteristic of the filtration device is that there are few types of pump motors. Under the present circumstances, there is no choice but to select an electric power that is always larger than the required amount. However, since the present invention can be used in accordance with the optimum circulation flow rate from the beginning, the running cost can be significantly reduced.
Decreasing the circulation flow rate in the filtration circulation system means that the pipe resistance is remarkably reduced. Under normal installation conditions where the lift is due to the pipe resistance rather than the height difference, the flow rate is reduced even if the power is reduced. It does not decrease so much. In addition, if the flow rate is approximately X times as a characteristic of the motor, the electric power becomes more than the square of X. Therefore, the synergistic effect is combined and the electric power is remarkably small.
In the measured value of the product of the present invention, the relationship between the flow rate and the power consumption is 77% for the flow rate of 90%, 57% for 80%, 40% for 70%, 29% for 60%, It was 22% at 50%, 20% at 40%, and 16% at 30%.
[0011]
B) As a characteristic of sand filtration, which is the most filtration method, it is known that the filtration accuracy increases as the flow rate of circulating water flowing through the filter medium, that is, the water flow velocity Lv value is small. 50 m / h for pools and 25-30 m / h. The deeper the target tank is, the higher the filtration accuracy is required. This is because even if the turbidity is the same, it appears cloudy when deep. The depth of the bath is 550 to 600 mm, and the pool is 1100 to 1200 mm. Originally required accuracy is different, but this difference is that the water line speed is different and the finest filter material has a particle size of 0.6mm for bath and 0.45mm to 0.5mm for pool It is just the same, others are exactly the same specifications.
In other words, if the filtration speed can be reduced at times other than the peak, the bath filtration device can approach the pool one as much as possible. The one-passing capture rate is also greatly improved.
Usually, the required filtration accuracy of the bath filtration device is 30-40 μm. At least 30 to 40 μm must be able to filter 90% or more. In comparison, the filtration accuracy required for the pool is 10 to 20 μm. By this invention apparatus, it is that the filtration apparatus for baths has the precision close to that for pools.
It should be noted that, of course, the conditions for the number of turns at the peak time, which means that the turn must be made early during the time when the dirt is severe, must be factored in. The number of bathers and the number of swimmers are extremely different between the peak of Saturday and Sunday and the daytime of weekdays. While satisfying this condition, it is possible to sufficiently save and improve the filtration accuracy.
[Brief description of the drawings]
FIG. 1 is a schematic view of an apparatus added to a filter apparatus main body in an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Operation indicator 2 Cooling fan 3 Inverter 4 DC reactor 5 Earth leakage breaker 6 Programmable controller 7 Magnetic contactor for commercial operation 8 Magnetic contactor for inverter operation 9 Terminal block

Claims (2)

A control device is provided in addition to the filtration device to supply driving power to the pump motor of the filtration device. The control device includes an inverter that converts a frequency of a commercial power source to the motor, and the inverter supplies the motor with the inverter. The commercial power supply is controlled every day of the week, at peak hours and at times when the load is low, and the frequency value of the power supply to the motor is changed between 100% and about 15% to perform the filtration operation, as well as backwashing and washing. A programmable controller that performs operation with a frequency value of the power supply to the motor at 100% is mounted, and it is possible to switch between inverter control operation by this programmable controller and manual operation that is performed by supplying commercial power to the motor, A control system for a filtration device , characterized in that a backwash operation is set immediately after the inverter control operation is completed . 2. The control system for a filtration device according to claim 1 , wherein the control device is configured to be settable for operation so that the control device can be added to another filtration device .

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