JPS6221358Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a variable speed rotating disk water treatment device in a microbial sewage treatment device. Conventionally, rotating disk water treatment devices have been used for sewage treatment using microorganisms, but the set rotation speed of the disk in the rotating disk device constituting the rotating disk water treatment device is determined by the maximum possible contamination of the sewage. It is fixedly set according to the load amount. However, there are very few chances that the wastewater conditions (temperature, water volume, amount of organic matter load, etc.) will become worst, and power consumption is proportional to the 2.8th power of the rotation speed, so when the load is light, the rotating disk will rotate more than necessary. You're wasting electricity. Therefore, when the load is light, it is necessary to lower the rotation speed to an appropriate level to reduce power consumption and save energy. By making the rotating disk variable speed, the advantages of the energy-saving rotating disk water treatment device, which has been recognized in the past, can be further exploited. The rotation speed control method that makes the rotating disk variable speed includes:
In addition to the frequency conversion method, there are methods such as a motor pole number conversion method, and changing the driving side and driven side gear ratios. In view of these points, the present invention adopts a rotation speed control method using a frequency conversion method to continuously adjust the rotation speed and make the rotating disk variable speed. The purpose of this invention is to provide a variable speed rotary disk water treatment device that can further exploit the advantages of a disk water treatment device, and will be described below using examples. FIG. 1 shows an embodiment of a variable speed rotary disk water treatment device according to the present invention, in which 1 is a commercial frequency three-phase AC input, 2 is a frequency converter 3 and a sensor input converter 4. A control panel 5 that is incorporated and includes a control device for the raw water pump 15 (not shown)
is an adjustment tank into which raw water flows in through a raw water inflow pipe 6, and a water level sensor 7, a water temperature sensor 8, and an organic matter load sensor 9 installed in the raw water of this adjustment tank 5 convert the condition signal of the raw water into sensor input. Device 4
The signal is input to the frequency conversion device 3 via the frequency converter 3. In the frequency conversion device 3, a set frequency output 10 obtained by converting the frequency of the three-phase AC input 1 based on the condition signal of the sensor input conversion device 4 is sent to a rotating disk drive motor (induction motor) 11. supplying. 12 is a power transmission chain, 13 is a rotating disk, and the rotating disk 13 is a power transmission chain 12.
It is rotatably wound around the rotary disk drive motor 11 via. 14 is a rotating disk device, and the rotating disk 13 is disposed within this rotating disk device 14. 15 is a raw water pump, and water level sensor 7
When a constant water level is detected, a command to turn on the raw water pump 15 is issued from the control panel 2, and the raw water is pumped to the rotating disk device 14. 16 is a treated water outflow pipe. In the variable speed rotary disk water treatment device with such a configuration, raw water (sewage) flows into the adjustment tank 5 from the raw water inflow pipe 6 and stays there, and when a constant water level is detected by the water level sensor 7, sensor input conversion is performed. It is input to the frequency conversion device 3 via the device 4 . Further, a command to turn on the raw water pump 15 is issued from the control panel 2, and the raw water is pumped from the adjustment tank 5 to the rotating disk device 14. On the other hand, the rotating disk drive motor 11 is driven based on the set frequency output 10 of the frequency converter 3, and the rotating disk 13 is driven by the rotating disk drive motor 11.
A predetermined rotational speed is applied to the rotary disc 13 via the power transmission chain 12, and the raw water undergoes biological treatment by the rotation of the rotating disc 13, and the treated water is discharged from the treated water outlet pipe 16. The above is the processing flow using the rotating disk of the present invention, and the present invention also aims to save energy by making the speed of the rotating disk variable as follows. Figure 2 shows details of the main parts of the present invention, especially the first part.
An example of the rotation speed switching circuit of the variable speed rotating disk in the figure is shown. In FIG. 2, the same reference numerals are used for the same components as in FIG. 1 or those having the same functions. In FIG. 2, regarding the configuration of the sensor input conversion device 4, X _i and x _i (i=1, 2,
3 and 4) are the coil and contact of the auxiliary relay, VR _i (i = 1, 2, 3, 4), VR is a variable resistor, and if you want to set the initial rotation speed according to the conditions, Input settings, including fine adjustments, can be made by turning the appropriate one of the variable resistors VR _i and VR. SW is a changeover switch, and the speed can be changed by switching the changeover switch SW to either AUTO (automatic operation) or MANUAL (manual operation). Note that the frequency conversion circuit 3 may be of either a thyristor type or a power transistor type. Also, CS is a condition setting section outside the panel, and this condition setting section CS is a changeover switch SW _1.
- SW ₅ , and the changeover switch SW ₁ is switched to the corresponding contact depending on the presence or absence of raw water based on the sensor output of the water level sensor 7, that is, when raw water is present, it is switched to the fixed contact A side, and when there is no raw water, it is switched to the fixed contact B side. In addition, the changeover switch SW ₂ is set to the corresponding contact depending on the amount (high or low) of organic matter output from the organic matter load amount sensor 9, that is, when the amount of organic matter load is high (“high”), the switch SW 2 is set to the fixed contact a side when the amount of organic matter load is small (“high”). “Low”) Fixed contact b
Switch to the side. In addition, the changeover switches SW ₃ to _{SW 5} are interlocked, and these changeover switches SW ₃ to _{SW 5} change the corresponding contact depending on the level of water temperature determined by the output of the water temperature sensor 8, that is, when the water temperature is "low", the fixed contact a is
When the water temperature is high, the fixed contact switches to the b side. Reference numeral 11 denotes a rotary disk drive motor, and an induction motor (abbreviated as IM) is used. A plurality of these induction motors 11 can be controlled simultaneously based on the set frequency output of the frequency conversion circuit 3. The setting of the frequency f (setting of the number of rotations n) of the frequency conversion circuit 3 is to obtain the set number of rotations using the formula n=120f/p, where p is the number of poles. The example shown in FIG. 2 can be summarized as shown in the table below.

[Table] Note that 17 is a power supply line for setting conditions. Furthermore, although not shown in FIG. 2, each operation display, setting frequency display, control circuit ON/OFF operation circuit, etc. are all designed to be easy to incorporate and operate. Based on this configuration, the signals from the water level sensor 7, water temperature sensor 8, and organic matter load amount sensor 9 are transmitted by switching the changeover switches SW ₁ to _{SW 5} of the condition setting section CS, and the contact signals, that is, the signals from the condition setting section The combined condition signals from the CS are provided to the sensor input conversion device 4. In the sensor input conversion device 4, the condition signal output from the condition setting section CS operates the corresponding auxiliary relay, and the frequency setting input is supplied to the frequency conversion circuit 3, thereby automatically outputting the setting frequency (rotation speed) to the motor 11. can be changed to For example, when the water level sensor 7 indicates that there is raw water, the organic matter load sensor 9 indicates that there are a lot of organic matter (high), and the water temperature sensor 8 indicates that the water temperature is low, the changeover switches SW ₁ to _{SW 5} are switched as shown in the figure, and the auxiliary Relay coil X ₄ is energized and its contacts x ₄ are closed. If the changeover switch SW is switched to the AUTO side (automatic operation side), the voltage signal detected by the variable resistor VR ₄ will be supplied to the frequency conversion circuit 3 as a frequency setting input, and with this input as a condition, the 3-phase AC input will be activated. The frequency is converted and a set frequency output is sent to the rotating disk drive motor 11. The rotational speed of the rotary disk drive motor 11 is then variable-speed controlled to an appropriate rotational speed. This automatically reduces wasteful power consumption. In this way, the water level sensor 7, water temperature sensor 8, and organic matter load sensor 9 input the raw water conditions into the sensor input conversion device 4, and the output of this sensor input conversion device 4 is input into the three-phase AC input by the frequency conversion circuit 3. is given to the frequency conversion circuit 3 as a condition signal when converting the frequency. The rotational speed of the rotary disk drive motor 11 can be controlled to a suitable rotational speed by the set frequency output of the frequency conversion circuit 3. By controlling the rotating disk 13 at variable speed depending on the raw water conditions, wastewater (raw water) can be treated at an appropriate rotation speed, and unnecessary power consumption can be automatically suppressed, resulting in energy savings. can. In addition, by combining the following conditions: the presence or absence of raw water as determined by the water level sensor 7, the amount of organic matter (high or low) as determined by the organic matter load amount sensor 9, and the level of water temperature as determined by the water temperature sensor 8, an energy-saving rotating circle that covers daily to annual fluctuations can be created. It becomes a board device. In this example, there are three types of sensor conditions (inputs in the condition setting section CS), and a fourth condition (inputs in the condition setting section CS).
(output), but there is no limitation to any number of items as long as there are other elements for rotational speed control. Therefore, it goes without saying that the number of auxiliary relays (X _i and x _i ) changes depending on the number of condition items. By using the present invention described above, the following various effects can be achieved. (1) By changing the frequency input to the motor (induction motor) that is the drive source of the rotating disk, the motor is made variable speed, and wastewater treatment is performed at an appropriate rotation speed. A large energy saving effect can be obtained compared to (2) The optimum rotation speed of the rotating disk can be easily initialized or reset according to the sewage conditions at the site. (3) In the variable speed rotating disk system, it is possible to control multiple rotating disk devices with one frequency converter, thereby achieving economies of scale. That is, by adopting the rotation speed control method using the frequency conversion method, it is possible to arbitrarily create rotation speed change conditions regardless of the number of raw water (sewage water) conditions.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of the variable speed rotating disk water treatment device according to the present invention, and Fig. 2 shows the main parts of the present invention, and the rotation speed of the variable speed rotating disk shown in Fig. 1. This is a circuit diagram showing an example of a switching circuit, in which 1 is a three-phase AC input, 3 is a frequency converter (frequency converter circuit), 4 is a sensor input converter, 5 is an adjustment tank, and 6 is raw water inflow. 7 is a water level sensor, 8 is a water temperature sensor, 9 is an organic matter load amount sensor, 10 is a set frequency output, 11 is a rotating disk drive motor, 12 is a power transmission chain, 13 is a rotating disk, 14 is a rotating disk 15 is a raw water pump, 16 is a treated water outflow pipe, and CS is a condition setting section.

Claims (1)

[Scope of utility model registration request] A group of water level, water temperature, and organic matter load sensors that detect each condition of the raw water in the tank, a condition setting section that sends out condition signals based on the outputs of these sensor groups, and a frequency setting section corresponding to the condition signal output of this condition setting section. A sensor input conversion device that sends out a setting signal, a frequency conversion device that sends out a setting frequency output based on the input condition signal of this sensor input conversion device, and a rotating disk drive motor whose speed is controlled based on the output of this frequency conversion device. A variable speed rotating disk water treatment device comprising: a rotating disk driven by the rotating disk drive motor; and a rotating disk device in which the rotating disk is placed in raw water. .