JPH09209978A - Submersible pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve check efficiency at the time of product inspection or testing by providing a pump control device with product test functions based on program routines without depending on real operation. SOLUTION: A pump control part 3 is integrally assembled in a pump part. Contaminated water storedin a water storage tank is drained by a submersible pump 2 through a drain pipe to an aeration tank by periodically actuating the pump control device 3. As a method for this periodic actuation, three float switches are used. This pump control device 3 is provided with product test functions based on program routines without depending on real operation. For example, in a test program, it is determined if the three float switches are combined as designated by a microcomputer 17 or not at every specified time after power is charged. Levels of the float switches are determined in order, and when it coincides with a command value, real operation is not executed, but the test program routines are executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible pump used, for example, in wastewater treatment of wastewater, and more specifically,
The present invention relates to a submersible pump having a function of shortening the time required for product inspection, motor analysis, and measurement of performance characteristics.

[0002]

2. Description of the Related Art A conventional sewage treatment system is provided with a water tank for storing sewage and an underwater pump for draining sewage from the water tank, as described in Japanese Patent Laid-Open No. 6-280783, for controlling the pump. The pump control device is a 3 float switch (for high water level detection,
For detecting the medium water level and for detecting the low water level), the operation method is as follows: dirty water flows into the water tank, the water level rises, the low water level float switch turns on, and the water level further rises The pump motor starts when the switch is turned on. At that time, the pump motor is controlled at a constant rotation speed.

Then, when the water level is lowered and the medium water level float switch is turned off, the speed-up rotation control is performed.

Incidentally, the water level is further lowered and the head height is increased by the speed-up rotation control. To solve this problem, a certain amount of waste water is supplied to the next aeration tank by increasing the rotation speed of the pump. You can

In the case of a submersible pump, it usually takes one hour or more for the rotation speed of the motor to reach the maximum rotation speed.

The motor is stopped at the time when the water level is lowered and the medium water level float switch is turned off, and the water level is further lowered and the low water level float switch is turned off.

Further, the high water level float switch, when the inflow of sewage is large despite the rotation of the motor, conversely lowers the rotation speed of the motor to reduce the amount of drainage.

[0008]

Conventionally, when inspecting a product of a submersible pump or the like, the maximum rotation speed, which is the most severe condition of the rotation speed of the motor, is used. As mentioned above, it takes more than one hour for the motor to reach the maximum speed, which is the most severe condition, and the inspection efficiency is very poor.

In addition, a normal characteristic test of a motor (analysis by load test, vibration test, etc., and measurement of performance characteristics) is usually performed at the maximum rotation speed in many cases. It takes time.

An object of the present invention is to significantly reduce the time required for product inspection or motor analysis and performance characteristic measurement as compared with the conventional method, thus improving the checking efficiency during product inspection and testing. To provide a submersible pump.

[0011]

The above object is to provide a submersible pump in which a pump section and a pump control apparatus for controlling the pump section are integrally incorporated, and the pump control apparatus is provided with a product test by a program routine that does not depend on actual operation. It is achieved by adding a function.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a wastewater treatment system incorporating a submersible pump according to the present invention.

A commonly used sewage treatment system is a water storage tank indicated by reference numeral 1 in FIG. 1, an aeration tank, a sedimentation tank,
It consists of a disinfection tank, and the submersible pump 2 is located at the first stage of sewage treatment.

Reference numeral 3 is a pump control device which is integrated with the pump unit and controls the pump unit, and 11 is a flow rate sensor.

The work flow of the wastewater treatment system is as follows.

For example, miscellaneous wastewater (dirty water) 4 flowing from each household is temporarily stored in the water storage tank 1 through the dirty water pipe 6.

The sewage 4 stored in the water storage tank 1 is periodically operated by the pump control device 3 so that the submersible pump 2
Is sent as drainage 5 to the next aeration tank via the drainage pipe 7.

There is a float switch system as a method for periodically operating the pump control device 3, and for example, three float switches 8, 9 and 10 (for high water level detection, medium water level detection, low water level detection) are used. , Its operating method is that when the sewage 4 flows into the water tank, the water level 12 rises, the low water level float switch 8 turns on, the water level 12 further rises, and the medium water level float switch 9 turns on. Will start.

The timing for stopping the motor is the water level 1
This is the time point when 2 drops and the middle water level float switch 9 turns off, and further the water level 12 drops and the low water level float switch 8 turns off.

It should be noted that when the pump 2 is started, the flow rate sensor 11 attached to the end of the drainage pipe 7 periodically takes in the flow rate data at a constant sampling time and compares it with a preset command flow rate. The difference is calculated by the calculation unit, the result is converted into a capacity control amount, and a constant flow rate is sent to the next aeration tank.

FIG. 2 is a block diagram of a drainage control device drive unit including a motor.

The pump controller 3 includes a power supply connector 13
, Rectifier circuit 14, power conversion circuit 15, and protection circuit 1
6, a control microcomputer 17, a variable control circuit 18, and a flow rate measuring means 19.

The submersible pump 2 comprises a pump unit 2a and a motor unit 2b. The flow rate sensor 11 is included in the flow rate measuring means 19.

The control microcomputer 17 has a control signal output means 20, an arithmetic processing means 21, and a time measuring means 22.
And a time storage means 23.

Next, the operation will be described.

The commercial AC power input from the power connector 13 is converted into a DC power by the rectifier circuit 14.

The high DC voltage is supplied to the motor unit 2b via the power conversion circuit 15.

On the other hand, the DC low voltage that has passed through the protection circuit 16 is supplied to the control microcomputer 17.

Then, the motor unit 2b rotationally drives the pump unit 2a, and the submersible pump 2 is operated to drain the dirty water. At this time, the encoder and the F sensor are used as feedback signals from the flow rate sensor information and the motor unit 2b.
Using G (tacho generator), the control microcomputer 17 calculates a predetermined rotation speed for controlling the motor unit 2b.

Then, the control signal output means 20 outputs a control signal corresponding to the rotational speed to the variable control circuit 18, and the motor rotational speed of the motor unit 2b is controlled in this manner.

The variable control of the rotation speed shown in this embodiment is executed by the power conversion circuit 15, the control microcomputer 17 and the variable control circuit 18, and is generally called a PWM control system.

Next, each step processing of the flow shown in FIG. 3 will be described.

When the power is turned on, in step 1, initial processing of the microcomputer is performed.

Next, in step 2, the level of the float switch is read, and in step 3, it is determined whether or not the value is 7, which is a combination of predetermined patterns. Here, if it is 7, the process goes to step 4, and if it is not 7, it goes to the main routine which is a normal actual operation.

In step 4, the level after the delay processing of 1 second is read, and if it is 5 in step 5, the process goes to step 6 and if it is not 5, the normal main routine is entered.

In step 6, the level after the delay processing of 1 second is read, and if it is 3 in step 7, the process goes to step 8 and if it is other than 3, it enters the normal main routine.

In step 8, the level after delay processing for 1 second is read, and if it is 1 in step 9, go to step 10 and 1
If not, the normal main routine is entered.

In step 10, the level after delay processing for 1 second is read, and if it is 0 in step 11, step 12
If the value is other than 0, a normal main routine is entered.

The product test program routine is entered only when step 12 is reached. That is, the power is turned on, the level of the float switch is read every one second, and the test program routine is entered only when the level values at that time all match the command value.

Next, each step processing of the flow chart of the test program of FIG. 4 will be described.

At step 1, initial processing of the microcomputer is performed.

Next, in step 2, the level of the float switch is read, and in step 3, it is determined whether or not the value is 1. Here, if it is 1, the process returns to step 4, and if it is not 1, the process returns to step 2 again.

At step 4, the level of the float switch is read, and at step 5, it is determined whether the value is 3. If it is 3, the process returns to step 6, and if it is not 3, the process returns to step 4.

In step 6, the motor starting process is performed, and the motor is rotated at the initially set rotation speed. Then, the level of the float switch is read, and in step 7, it is determined whether the value is 1. If it is 1, the motor is set to the maximum rotation speed (step 8), if it is 7 (step 11), the motor is set to the minimum rotation speed (step 12), otherwise it returns to step 7. In step 9, it is determined whether or not the value is 0. If it is 0, the motor is stopped (step 10), and the process returns to step 2. If it is not 0, the process returns to step 7.

The method of canceling the test program is to turn off the power once.

As described above, according to the present embodiment, the input determination of the test program is performed by setting the level of the existing float switch (for high water level detection, medium water level detection, low water level detection) at every sampling time of 1 second. judge.

[0048]

According to the present invention, the time required for product inspection of a submersible pump, analysis of a motor, or measurement of performance characteristics can be significantly shortened as compared with the conventional method. Check efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a wastewater treatment system incorporating a submersible pump according to the present invention.

FIG. 2 is a block diagram of a drainage control device drive unit including a motor.

FIG. 3 is a diagram showing a flowchart of a test program input unit.

FIG. 4 is a diagram showing a flow chart of a test program.

[Explanation of symbols]

1 ... Water tank, 2 ... Submersible pump, 3 ... Pump control device, 4
… Domestic miscellaneous wastewater (sewage), 5… Wastewater, 6… Sewage pipe, 7…
Water pipe, 8 ... Low water level float switch, 9 ... Medium water level float switch, 10 ... High water level float switch, 11 ...
Flow rate sensor, 12 ... Water level.

Claims (4)

[Claims] 1. A submersible pump in which a pump section and a pump control apparatus for controlling the pump section are integrally incorporated, wherein the pump control apparatus is provided with a product test function by a program routine that does not depend on actual operation. Submersible pump. 2. In a submersible pump in which a pump unit and a pump control device for controlling the pump unit are integrally incorporated, it is determined whether or not a combination state of a float switch designated by a microcomputer is set at regular time intervals after power-on, and all The submersible pump is characterized in that if it matches, the product test program is started without actually operating. 3. A submersible pump in which a pump section and a pump control device for controlling the pump section are integrally incorporated, and the float switch has two functions of water level determination and product test program input determination. Submersible pump characterized by. 4. A wastewater treatment unit incorporating the submersible pump according to any one of claims 1 to 3.