JPS5813754B2 - Automatic control method for drainage pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a method for automatically controlling two drainage pumps installed underwater to automatically drain water.

In conventional drainage pump equipment, two automatic start/stop submersible pumps of the same type are installed underwater, one of which is used all the time and the other is used as a backup. If an accident may occur where the impeller of the backup pump locks up, or if the regular pump suffers an accident such as blockage of the impeller due to foreign matter being sucked in, drain water until the backup pump is activated. There was a drawback that it could not be done.

A technique is also known in which two pumps are operated alternately, but this complicates the control device and also complicates water level detection.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic control method for a drainage pump that allows two pumps to be operated alternately using a simple control device.

According to the present invention, in a drainage pump method in which two pumps are installed to automatically perform drainage, the first drainage pump is automatically started at the upper limit water level B, and the first drainage pump is automatically started at the upper limit water level B.
The second drain pump detects a water level D lower than the upper limit water level B of the first drain pump as the upper limit water level, and automatically stops after T time delay after detecting the water level D. By configuring the system to start at a water level C lower than the lower limit water level A of the first drainage pump and automatically stop at a water level C lower than the lower limit water level A of the first drainage pump, two pumps can be used at all times to prevent impeller lock accidents. Even if one pump fails, other pumps can reliably carry out drainage without interrupting drainage.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pump device implementing the present invention, and 1 indicates a first
2 is a drainage pump that starts at water level B and stops at water level A, and is an automatic start/stop type submersible pump with a built-in automatic operation relay, which is conventionally known. 2 is a second drainage pump that detects the upper limit water level at water level D. For example, an automatic start/stop type submersible pump with a built-in timer and automatic operation relay that starts after a fixed time T delay after detecting the upper limit water level D and stops at the water level C (however,
B water level>D water level>C water level).

In detail, 11.21 is the bomb body in which the pump and electric motor are integrated, 12.22 is the suction port, and 13.23
Discharge pipe, 14.24 is power cable, 15a, 15b,
25a and 25b are floats (in addition,
Other suitable liquid level detectors may be used in place of the float.

), 16.26 is an adjustment rod that moves the float up and down.

Next, embodiments of the present invention will be described.

In Figure 2, when the water level rises and reaches water level B, the first
The pump 1 starts, and therefore the drainage work begins.

Therefore, when the water level decreases, the first pump 1 stops at the A water level, but in the meantime, the second pump 2 starts after a T time delay from the detection of the D water level and automatically drains water to the C water level.

This kind of operation is repeated during normal operation.

Now, for example, if the first pump 1 breaks down and the first pump 1 stops at point Z in FIG. 2, making it impossible to drain water,
Since the second pump 2 has already detected the D water level, it starts at the E water level after a certain time T delay and drains water up to the C water level.

E-C until the first pump 1 is repaired and put into operation again.
The second pump 2 automatically drains the water at a water level between.

Also, when the second pump 2 is abnormal, the first pump 1 is switched to B-A.
Automatically drains between water levels.

For example, if the amount of water flowing into the tank due to heavy rain is extremely large and exceeds the displacement of one pump, the first pump 1 will start at water level B, but the water level in the tank will continue to rise.

Even in such a case, the second pump 2 starts operating after T time from the detection of water level D, and the abnormal water increase is appropriately dealt with.

As described above, according to the present invention, the second pump 2 starts after a fixed time delay after detecting the water level D, which is lower than the B position at which the first pump starts. If the setting is set around the time required for the first pump to drain water to level A after it starts draining, the first pump will start and then stop, then the second pump will start and stop. do.

Therefore, the first and second pumps are always operated alternately, and rusting of the second pump can be prevented.

Of course, depending on a change in the amount of inflowing water, the second pump may be activated while the first pump is activated, but substantially alternate operation is performed.

Furthermore, even if one of the pumps were to fail, the water level would rise to the relatively high water level E, but this would not affect the drainage work in any way.

Furthermore, by carrying out the present invention, both the first pump and the second pump only need to have two liquid level detectors, and the control circuit only needs to be provided with tires. Can be operated in series.

In other words, in the conventional technology, it is necessary to provide a special control circuit for alternate operation and a liquid level detector in a special position, but according to the present invention, it is only necessary to provide a timer.
The control circuit can be simplified and reliability is improved.

Moreover, according to the present invention, even if one of the first or second pumps causes an unexpected accident such as blockage in the impeller due to suction of foreign matter, the first pump and the second pump can independently drain water. Since the system runs in parallel, there is no need to interrupt drainage as in the case of conventional methods.

Furthermore, when a large amount of rainwater that cannot be drained by a single pump flows into the tank, the drainage pump method according to the present invention
Since two pumps discharge water at the same time, it is possible to appropriately deal with abnormal water increases during heavy rains.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram of a pump implementing the drainage bomb method according to the present invention, and FIG. 2 is a diagram showing the relationship between water level fluctuations and pump operating conditions. 1...First pump, 2...Second pump, 11, 21
... Pump body, 12, 22 ... Suction port, 13, 23 ...
...Discharge pipe, 14.24...Power cable, 15a, 15
b, 25a, 25b...Float, 16, 26...Adjustment rod that moves the float up and down.

Claims (1)

[Claims] 1 In an automatic control method for a drainage pump that automatically drains water using two pumps, the first drainage pump automatically starts at the upper limit water level B and automatically stops at the lower limit water level A. However, another second drainage pump detects a water level D lower than the upper limit water level B of the first pump as the upper limit water level, and after detecting the water level D, automatically starts after a certain time delay, An automatic control method for a drainage pump, characterized in that the drainage pump is automatically stopped at a water level C lower than the lower limit water level A of the first pump.