JPH0777191A - Precedent stand-by operating method for pump - Google Patents

Abstract

PURPOSE:To provide a method for carrying out the precedent stand-by operation of a pump by only full-power draining operation without aerial operation and steam agitating operation. CONSTITUTION:A clutch 11 is attached to a power transmission path between the output shaft 2 of a pump driving prime mover 1 and a pump shaft 5, and the prime mover is continuously operated irrespective of the suction or discharge water level of the pump, and when the suction or discharge water level attains a set up value, the clutch 11 is engaged or disengaged to rotate or stop a pump impeller 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of pre-standby operation of a pump.

[0002]

2. Description of the Related Art In recent years, for example, in pump equipment for draining rainwater, in order to cope with rainfall intensity and sudden water discharge,
Regardless of the presence or absence of water in the pump water absorption tank, the so-called precedent standby operation method of operating the pump in advance,
It is well known in Japanese Utility Model Publication No. 63-150097. By the way, in the one described in the above publication, an air suction pipe is provided on the impeller suction side of the pump casing, and when the water absorption surface fluctuates, air is sucked from the air suction pipe into the impeller by the water surface level. Therefore, the pump performs "in-air operation" and "air-water stirring operation" in addition to "full drainage operation" depending on the water level.

[0003]

As described above, the conventional
Since the preceding standby operation method of the pump performs the in-air operation and the water-water agitation operation, it imposes severe operation on the pump and cannot be said to be a preferable operation method. Further, in the one disclosed in the above publication, an air suction pipe is required, and further,
In the case where the submersible bearing device of the pump itself is self-lubricated by the discharge water of the pump itself, the bearing seizes and burns out during air operation, so separate water injection equipment from another external water source is required. And Furthermore, in the steam-water stirring operation, a large impact force is repeatedly applied to the impeller and the shaft, so that there are many problems that the thick-walled impeller and the shaft have to have a large diameter. Therefore, it is an object of the present invention to provide a method of preceding standby operation of a pump, which can solve the above-mentioned conventional drawbacks by a simple means.

[0004]

In order to achieve the above-mentioned object, the present invention provides a method of preliminarily standby operation of a pump, in which a clutch is mounted in a power transmission path between an output shaft of a pump drive motor and a pump shaft. , The engine is continuously operated regardless of the suction water level or the discharge water level of the pump, and when the suction water level or the discharge water level reaches a set value, the clutch is turned on or off to rotate or stop the pump impeller. It was done like this.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method of the preceding standby operation of the pump of the present invention will be explained with reference to FIG. In the figure, 1 is a pump driving prime mover such as a diesel engine or a motor, 4 is a pump arranged in a water absorption tank 3, and an output shaft 2 of the prime mover 1 is an input shaft of a gear reducer 7 via a clutch 11 described below. 8
The output shaft 9 of the gear reducer 7 is connected to the pump shaft 5 of the pump 4. In addition, 6 is an impeller, 1
Reference numeral 0 is a water level detector of the water absorption tank 3.

[0006] In the conventional case, the clutch 11 employs a fluid discharge type fluid coupling for absorbing torsional vibration and starting the prime mover at a light load. By supplying or discharging the hydraulic oil in the tank 13 to or from the clutch 11, transmission / reception of power between the output shaft 2 of the prime mover 1 and the input shaft 8 of the gear reducer 7 is turned on / off. .

According to the present invention, in the pump equipment configured as described above, only the prime mover 1 is driven with the clutch 11 kept in the off state before water flows into the water absorption tank 3 from the outside. Then, when the water level in the water absorption tank 3 gradually rises and reaches a predetermined high water level H, the water level detector 10 operates, the oil supply pump 12 operates and the clutch 11 turns on, and at the same time, the pump shaft 5 And the impeller 6 starts rotating, and the full drainage is performed.

On the other hand, as described above, when the water level in the water absorption tank 3 is lowered as a result of full drainage to reach a predetermined low water level L which does not suck air from the bell mouth 4a, the water level detector 10 detects this. Then, the oil supply pump 12 is stopped, the clutch 11 is turned off, the rotation of the impeller 6 is stopped, and the drainage by the pump 4 is interrupted. In addition, the prime mover 1 continues rotating as it is to prepare for the next drainage process.

In the above-described embodiment, the case where the charge / discharge oil type fluid coupling is used as the clutch 11 has been described. However, as shown in FIG. 2, a hydraulic friction clutch may be used. In this hydraulic friction clutch, the pump shaft 5 sometimes starts rotating impulsively.
The air vessel Av is attached to the cushion 4 to reduce the shock, and the pump 4 and the gear reducer 7 are installed.
You may prevent the impact on.

The clutch 11 may be provided at any place between the prime mover 1 and the pump shaft 5 other than the above-mentioned place. In addition to starting and stopping the pump 4 in association with the water level of the water absorption tank 3, as described above, when the water level of the discharge water tank becomes higher than the high water level H, the clutch 11 is turned off and the low water level L is set. Then it can be turned on and applied to irrigation pumping.

[0011]

As is apparent from the above description, according to the present invention, when the pump shaft starts to rotate, the pump always performs full drainage operation, so that there is no aerial operation.
Therefore, water can be injected into the submersible bearing device by the discharge water of the pump itself, and no external water injection equipment is required. In addition, since the pump is always operated under normal load conditions, it is not necessary to make the impeller or pump shaft particularly thick or have a large diameter, nor is it necessary to use an air suction pipe, which is better than conventional products. It is inexpensive and can solve the conventional problems for performing the preceding standby operation. It should be noted that conventional pump equipment that has been installed in the past that uses a hydraulic friction clutch or a charge / discharge oil type fluid coupling makes it possible to easily perform preceding standby operation simply by modifying the sequence circuit. It also has advantages.

[Brief description of drawings]

FIG. 1 is an explanatory view showing pump equipment for carrying out the present invention.

FIG. 2 is an explanatory view showing another embodiment of the clutch of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Prime mover, 3 ... Water absorption tank, 4 ... Pump, 5 ... Pump shaft, 6 ... Impeller, 7 ... Gear reducer, 10 ... Water level detector, 11 ... Clutch, 12 ... Refueling pump, 13 ... Oil tank.

Claims (1)

[Claims] 1. A clutch is mounted in a power transmission system path between an output shaft of a pump driving prime mover and a pump shaft, and the prime mover is continuously operated regardless of a suction water level or a discharge water level of the pump to obtain a suction water level or a discharge level. A method of preceding standby operation of a pump, characterized in that when the water level reaches a set value, the clutch is turned on or off to rotate or stop the pump impeller.