JPS61250395A - Automatic running method of intake pump - Google Patents

Abstract

PURPOSE:To realize perfect execution of automatic running without requirement for neither man power nor a watchman by restarting the captioned pump instead of treating it as heavily impeded one, even when an inpediment occurs and the pump is stopped upon detection of no water conveyance, if times of operation is longer than the previously set time. CONSTITUTION:When plugged mesh of a strainer by a foreign matter or mixing of air into a suction pipe, due to impediments such as attachment of leaves to the strainer and the like, causes extreme reduction of the water conveyance quantity to put a contact 6 of no water conveyance detection in operation and further to put a main pump 10 in stoppage and a vacuum breaking valve 3 is opened, if the length of operation from the starting time is less than the length based upon allowable starting frequency of the main pump 10 driving motor, that is, the previously set regular length, the pump 10 is treated as heavily impeded one and stopped in order to remove the impediment. In case said length of operation exceeds said regular length, the pump is not treated as heavily impeded one but operation is continued through priming water by a vacuum pump 7 again and subsequently starting the pump 10. Thus, perfect automatic operation is realized without requirement for man power.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for automatically operating a water intake pump.

Conventional technology and its problems Figure 1 shows a typical system diagram of a water intake pump in which the water pump is located higher than the suction water intake surface, and Figure 31 is a sequence block diagram of the conventional automatic operation method. . In FIG. 1, 10 is a water intake pump, 12 is a suction pipe, 2 is a check valve, and 16 is a discharge pipe. WL is the suction water level;
1 is a strainer, 3 is a vacuum breaker valve, 4 is an electric intake valve,
6 is a non-water supply detector, 14 is a full water detector, 13 is a drive motor, and 15 is a side gutter.

Furthermore, 7 is a vacuum pump, 8 is a vacuum gauge, 5 is a tank, 9 is a level meter, and 11 is a switchboard. shows the case of starting, and FIG. 5(B) shows the case of stopping.

For starting, set the switch to interlock and turn it on 0 days or turn it on automatic. The vacuum pump is turned on, the vacuum breaker valve is closed, the electric intake valve is opened, the vacuum pump is started, and when full water is detected, the main pump is started, the electric intake valve is closed, and the vacuum pump is stopped.

If the flow rate of water becomes extremely low due to obstruction of the strainer 1 or pump impeller inlet with leaves or other foreign objects, the non-water supply contact 6 attached to the check valve 2
operates, issues a serious failure alarm, and the pump stops, water supply stops, and the vacuum breaker valve opens. Obstacles will then be removed manually.

However, when water is taken from rivers in particular, there are many foreign substances such as leaves, and problems tend to occur constantly. As with the conventional technology, there is a drawback that the system is constantly stopped due to a major failure, and each time it requires unnecessary effort and time to manually remove the failure or reset the major failure and restart the system.

Means for Solving the Problem In this invention, we focused on the fact that there is a high possibility that the obstruction will be removed by backflow when the pump stops, and we calculated the time from the main pump to stop by reading and predicting the sequence. If the time is longer than the previously set time (time based on the allowable starting frequency of the main pump drive motor), it is not considered a mold failure and the pump is started again by priming with the vacuum pump. The method was designed to do so.

Embodiment FIG. 2 is a sequence block diagram of the automatic operation method of the present invention, and FIG. 2 (4) is a sequence block diagram of the automatic operation method of the present invention.
indicates the case of stop.

In the method of this invention, there is no difference in starting and stopping the pump from the conventional method shown in FIG. When air enters the pipe, the amount of water being conveyed is extremely reduced, and the no-water-feeding detection contact 6 is activated, the main pump is stopped, and the vacuum breaker valve 3 is opened, check whether the operating time is longer than the specified time from the time of startup. If the time is less than the specified time, the pump will stop as a serious failure and remove the problem.

If the specified time is exceeded, do not treat it as a major failure, but start priming with the vacuum pump again, start the Shibombu, and continue operation. In other words, by detecting that no water is being fed, the pump is temporarily stopped, and the vacuum breaker valve is opened, causing the water in the pump body and piping upstream of the pump discharge check valve to rapidly flow backwards, resulting in backwashing of the pipes and the strainer 1. Since these blockages are often automatically cleared, the method of the present invention allows for complete automatic operation without the need for manpower or supervisors.

Effects The method of the present invention has such a configuration, and even when a failure occurs and the pump is stopped by detecting no water supply, the operating time remains the preset time based on the permissible starting frequency of the main pump motor since startup. Compared to this, if the pump lasts longer than that, it will restart without causing a serious failure, and in many cases the blockage will be automatically cleared by the backwashing effect caused by the backflow when the pump is stopped, so this method allows for safe continued operation. Most of the time, it does not require any manpower or supervisors, and is particularly effective in perfecting unmanned automatic operation of river water intake.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of the pump equipment, FIG. 2 is a flow diagram of the method of the present invention, and FIG. 3 is a sequence block diagram of the conventional method. Explanation of symbols 1...Strainer, 2...Check valve, 3...Vacuum breaker valve, 4...Electric intake valve, 5...Tank, 6...
・Non-water supply contact, 7... Vacuum pump, 8... Vacuum gauge,
9... Level meter, 10... Pump, 11... Switchboard, 12... Suction pipe, 13... Motor, 14...
Full water detector, 15...Gutter, 16...Discharge pipe agent Patent attorney (8107) Kiyoshi Takashi Sasaki (and 3 others)

Claims (1)

[Claims] In a water intake pump system where the water pump is installed above the water intake surface, the operation system uses a vacuum pump to prime water, detects when the water is full, and starts the pump.If an extreme drop in water volume occurs during operation, the pump will be displayed as having a serious failure. In the automatic operation method, if the water volume drops significantly after the pump is started and the time until the pump stops exceeds the specified set time, the pump is temporarily stopped and the inside of the pump body on the pump discharge side and the upstream side of the check valve is stopped. The water inside the pipe is caused to flow backwards, and the backflow effect eliminates the drop in water volume, and the system automatically primes water with the vacuum pump and restarts the pump to continue water supply without causing a major malfunction. Automatic operation method of water intake pump.