JPH0419390A - Automatic starting method for pump - Google Patents

Abstract

PURPOSE:To previously avoid an accident caused by delay of starting in a device wherein a pump is started when a level in a suction bath reaches a reference starting level by starting the pump at a pre-starting level lower than the reference starting level in case that a level rising speed in the suction bath is a specified value or higher. CONSTITUTION:In a device wherein inflowing water from livers or the like to a suction bath 5 is discharged by a discharge pump 1, a level varied by the inflowing water is continuously detected by a level detector 2 in the suction bath 5, an output signal thereof is input into a computation circuit 3, and the level variation, that is, accelerating rate of the inflow rate, is computed. When the accelerating rate exceeds a reference level rising speed, considering time from the starting of the pump to the full-speed operation, the pump 1 is automatically started through a pump control board 4 such that the starting is performed with a pre-starting level lower than a reference starting level. In case that the computed level rising speed is not higher than the reference level rising speed, the pump 1 is automatically started when the level reaches the reference starting level, similarly to a normal case.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for automatically starting a pump.

(Conventional technology and problems to be solved) Conventionally, when draining water in the water absorption tank using a pump, when the water level in the water absorption tank reaches the standard start-up water level, the pump is automatically started and the water is drained. It has become.

However, when the amount of water flowing into the water intake tank is abnormally large, such as during torrential rains, it is not enough to automatically start the pump when the standard start-up water level is reached, as described above, and the catchment area There was a risk of flooding in low-lying areas.

Therefore, the present invention solves the problems of the conventional method by limiting the automatic starting water level of the pump to only the standard starting water level as in the past, but changing it depending on the water level rising speed due to water flowing into the water suction tank. The purpose of the present invention is to provide a method for automatically starting a pump that can perform the following steps.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for automatically starting a pump that starts a pop when the water level in the water suction tank reaches a reference starting water level. When the rising speed is equal to or higher than a predetermined value, the pump is automatically started at a pre-start water level lower than the reference start-up water level.

(Example) Next, an example of the method for automatically starting a pump according to the present invention will be described with reference to the drawings.

In Fig. 1, 1 is a drainage pump, 2 is a water level detector, and 3
4 is a calculation circuit, 4 is a pump control panel, and 5 is a water suction tank.

The water level detector 2 continuously detects the water level that changes due to the inflow water flowing into the water absorption tank 5, inputs the output signal to the arithmetic circuit 3, and determines the water level based on the aging condition (time). Calculate the change (increase rate of inflow).

In this case, as shown in FIG. 2, if the standard start-up water level for automatically starting the pump 1 as in the past is i, and the standard water level rise rate in consideration of the drainage capacity of the pump 1 at this time is a, then The water level rise speed calculated by the calculation circuit 3 is
It is compared with the reference water level rising speed a that is input to the calculation circuit 3, and if the speed is lower than the reference water level rising speed as shown in Figure 2 b, the pump starts to operate at full speed. Taking into account the time, etc., a pump start signal is output to the pump control panel 4 to start the pump l at a pre-start water position lower than the standard start-up water level A, and the pump l is automatically started. On the other hand, if the calculated water level rise rate is less than or equal to the reference water level rise rate a, the pump 1 is automatically started when the water level reaches the reference start water level a, as in normal times.

In addition, if the water level rise speed is faster than the standard water level rise speed a, multiple speed ranges may be set and the advance start water level may be set corresponding to each speed range. If the rising speed is slower than that, the pump may be automatically started at the reference starting water level, and if it is faster, the pump may be automatically started at the pre-starting water level lower than the reference starting water level.

In the above embodiments, the pump is a chamber shaft pump, but the pump is not limited to this, and may be any other conventional type pump.

Further, the present invention can also be applied to a so-called advance standby type pump shown in FIG.

(Effects of the Invention) As is clear from the above description, according to the present invention, if the rate of rise in the water level of the water absorption tank due to inflow water is faster than the standard water level rise rate, before the water level reaches the standard starting water level, Since the pump starts automatically, it is possible to avoid the risk of flooding into low-lying areas of the catchment area due to delays in starting the pump.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of pump equipment to which the automatic pump starting method according to the present invention is applied, Fig. 2 is a graph showing the water level rise rate and pump starting time, and Figs. 3 and 4 are graphs of various pumps. It is a figure showing the relationship between a standard start-up water level and a precedent start-up water level. ■...Drainage pump, 2.Water level detector, 3.Arithmetic circuit, 5.Water suction tank, A...Reference starting water level, Port Preliminary starting water level, a...Reference water level rising speed.

Claims (1)

[Claims] (1) In an automatic pump start method that starts the pump when the water level in the water suction tank reaches the standard startup water level, if the water level rise rate in the water suction tank is higher than a predetermined value, advance activation is performed at a level lower than the standard startup water level. A method for automatically starting a pump characterized by automatically starting the pump depending on the water level.