JPH07103183A - Standby pump operating method - Google Patents

Abstract

(57) [Abstract] [Purpose] During pumping cutoff operation, prevent water W from remaining in the discharge pipe 4 and discharge riser pipe 4A to avoid abnormal vibration and to save energy during pumping cutoff operation. Avoid adverse effects on the pump constituent members due to the temperature rise of the residual water W. [Structure] When the water level of the intake well 10 drops to the pumping cutoff water level SWL, the intake valve 6A is fully opened to switch to pumping cutoff operation, and immediately after that, a cutoff signal is output from the controller 7 to the clutch 15 and the clutch 15 is shut off for a predetermined time to stop the operation of the vertical shaft pump 9, and all the residual water W in the discharge pipe 4 and the discharge rising pipe 4A is dropped into the suction well 10 to perform the pumping cutoff operation by complete air operation. I am trying.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a standby operation pump, and more particularly to an operation method for avoiding various adverse effects after pumping off.

[0002]

2. Description of the Related Art Conventionally, for example, the pump equipment shown in FIG. 1 has been known as a pump equipment for performing a preceding standby operation. In this preceding standby operation pump facility, an impeller 2 fixed to a main shaft 1 is rotatably accommodated in an impeller chamber 3, a discharge pipe 4 is connected to the discharge side of the impeller chamber 3, and suction of the impeller chamber 3 is performed. The suction pipe 5 is connected to the side of the suction pipe 5, and the suction pipe 5 is connected to an intake system 6 formed of an atmosphere open intake pipe 6B having an intake valve 6A interposed therebetween, and a water level signal detected by a water level detection means 7 is input to a controller 8. Then, the vertical mixed flow pump 9 configured to output the opening / closing signal from the controller 8 to the intake valve 6A based on the input water level signal is installed in the intake well 10. On the other hand, the main shaft 1 of the vertical shaft mixed flow pump 9 extends through the discharge elbow 11 in a watertight and rotatably manner to the outside, and is connected to the output rotary shaft 13A of the speed reducer 13 via the coupling 12 to reduce the speed of the speed reducer. 1
The input rotary shaft 13B of No. 3 is connected to the output rotary shaft 16A of an engine (for example, a diesel engine) 16 via a coupling 14 and a clutch 15. That is, the output rotary shaft 16A of the engine 16 and the main shaft 1 of the vertical shaft pump 9 are connected to each other by the power transmission means 17 having the coupling 12, the reduction gear 13 and the coupling 14 provided with the clutch 15, and the power transmission means 17 is provided. It has a structure in which the clutch 15 is interposed.

A conventional operation example using the standby operation pump facility configured as described above will be described. When the water level of the suction well 10 (hereinafter, simply referred to as the water level) rises. A-. Until the water level exceeds the pumping cutoff water level SWL and reaches the pumping start water level RWL, the intake valve 6A is fully opened to perform the air operation. A-. Intake valve 6 when the pumping start water level RWL is reached
Fully close A and perform regular drainage operation (100
% Q) and continue normal drainage operation at a water level above the pumping start water level RWL. When the water level of suction well 1 drops. B-. From the area where the water level exceeds the pumping start water level RWL,
Regular drainage operation is continued until the pumping start water level RWL is reached and the pumping cutoff water level SWL is lowered. B-. When the water level drops to the pumping cutoff water level SWL, the intake valve 6A is fully opened to switch to the pumping cutoff operation, and the pumping cutoff operation is continued at a water level below the pumping cutoff water level SWL.

By the way, in the conventional operation method of the standby operation pump, when the normal drainage operation is switched to the pumping cutoff operation by the pumping cutoff in B-, the inside of the discharge pipe 4 connected to the discharge side of the impeller chamber 3 is changed. A state occurs in which the water W remaining in the above is stirred by the impeller 2. That is, in the pumping water cutoff operation, the stirring of the residual water W in the discharge pipe 4 and the discharge rising pipe 4A by the impeller 2 is continued. In particular, when the discharge rising pipe 4A is long (high), the amount of the residual water W increases, so that the load becomes considerably large and at the same time, the impeller 2
Since a large back pressure is applied to the pump, a vibration larger than that during normal drainage operation is generated, which has various adverse effects on the pump equipment, and increases fuel consumption and running cost. Further, there is a concern that stirring of the residual water W may cause an increase in water temperature, which may adversely affect the pump constituent members.

[0005]

The problem to be solved by the present invention is that, in the conventional operation method of the standby operation pump, even if the normal drainage operation is switched to the pump cutoff operation by the pump cutoff, the water in the discharge pipe and the discharge rising pipe is Is a point that causes a large vibration, hinders the reduction of fuel consumption or power consumption during the pumping cutoff operation, and raises the temperature of the remaining water.

[0006]

The present invention continues regular drainage operation from the region where the water level exceeds the pumping start water level to the pumping start water level until it drops to the pumping cutoff water level. Switch to pumping cutoff operation to cut off pumping when it drops, and continue pumping cutoff operation until the water level rises to the pumping start water In the standby pump operation method, by switching to pumping cutoff operation Immediately after shutting off the pumping, the power interrupting mechanism installed in the power transmission means that connects the output shaft of the prime mover and the pump main shaft is interrupted, and after a lapse of a predetermined time, the power interrupting mechanism is released to shut off the pumping. The operation is characterized by preventing water from remaining in the discharge pipe and discharge riser pipe during the pumping cutoff operation, avoiding abnormal vibrations, and reducing fuel consumption or consumption during pumping cutoff operation. With reduced power, and achieve the purpose of avoiding an adverse effect on pump components that were caused by the temperature rise of the residual water.

[0007]

According to the present invention, the normal drainage operation is continued from the region where the water level exceeds the pumping start water level to the pumping start water level until it drops to the pumping cutoff water level. Immediately after shutting off pumping by opening the valve to switch to pumping shutoff operation, the power disconnect mechanism is shut off for a specified period of time to stop pump operation, so the discharge pipe and discharge riser pipe remain without stopping the prime mover. All water can be dropped.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, an intermittent signal is input from a controller 8 to a power disconnecting mechanism, that is, a clutch (for example, an electromagnetic clutch) 15 provided in a power transmitting means 17, based on a water level signal detected by the water level detecting means 7. It is like this. Although the clutch 15 is provided between the engine 16 and the coupling 14 in the embodiment, the clutch 15 may be provided between the prime mover (for example, the engine) and the pump 9, and the clutch can be provided by using a fluid coupling. It goes without saying that it may be configured so as to exert the action of.

The operation of the present invention by the stand-by pump equipment thus constructed will be described. When the water level of the suction well 10 rises. A-. Until the water level exceeds the pumping cutoff water level SWL and reaches the pumping start water level RWL, the intake valve 6A is fully opened to perform the air operation. A-. Intake valve 6 when the pumping start water level RWL is reached
Fully close A and perform regular drainage operation (100
% Q) and continue normal drainage operation at a water level above the pumping start water level RWL. When the water level of suction well 1 drops. B-. From the area where the water level exceeds the pumping start water level RWL,
Regular drainage operation is continued until the pumping start water level RWL is reached and the pumping cutoff water level SWL is lowered. B-. When the water level drops to the pumping cutoff water level SWL, the intake valve 6A is fully opened to switch to the pumping cutoff operation. Immediately thereafter, the controller 8 outputs a disconnection signal to the clutch 15 to disconnect the clutch 15 and stop the operation of the vertical shaft pump 9. As a result, all the residual water W in the discharge pipe 4 is absorbed by the water absorption well 1.
Drop to 0.

When a predetermined time has elapsed after the clutch 15 was disengaged, specifically, the discharge pipe 4 and the discharge rising pipe 4
When all the residual water W in A falls into the water intake well 10, the controller 8 outputs a connection signal to the clutch 15 to connect the clutch 15. As a result, the vertical mixed flow pump 9 can enter the standby state in a complete air operation. That is, the pumping cutoff operation can be performed by a complete air operation. Therefore, the vibration during the pumping cutoff operation is significantly reduced, and it is possible to avoid the disadvantage that various adverse effects are exerted on the pump equipment. Further, even if the discharge rising pipe 4A is high, the stirring load of the water W is not applied to the impeller 2 at all. Therefore, the load of the engine 16 can be reduced to reduce the fuel consumption during the pumping cutoff operation. it can. Of course, the water temperature does not rise.

In the above embodiment, the vertical mixed flow pump 9 is used.
Although the preceding standby operation using is described, the present invention is applicable to the preceding standby operation using other pumps, and is not limited to the engine drive type described in the above embodiment, and the motor It can also be applied to a drive pump.
Further, in the above embodiment, the engine 16 and the coupling 1
4, the clutch 15 may be provided between the prime mover (for example, the engine) and the pump 9. The clutch 15 may be provided by using a fluid coupling. Needless to say.

[0012]

As described above, according to the present invention,
No water will remain in the discharge pipe and the discharge rising pipe after the pumping is cut off. Therefore, since the pumping-off operation can be performed by the complete air operation, the vibration during the pumping-off operation can be significantly reduced, and various inconveniences on the pump equipment can be avoided. Moreover, since the stirring load of water is not applied to the impeller at all, it is possible to reduce the load on the prime mover to reduce the fuel consumption or power consumption during the pumping interruption operation, and also to avoid the adverse effect of the temperature rise of the residual water. You can definitely avoid it.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a pump applied to the present invention.

[Explanation of symbols]

 1 Spindle 9 Vertical shaft mixed flow pump (pump) 15 Clutch (power disconnect mechanism) 16 Engine (motor) 17 Power transmission means SWL Pumping cutoff water level RWL Pumping start water level W water

Claims (1)

[Claims] 1. The regular drainage operation is continued from the region where the water level exceeds the pumping start water level to the pumping start water level until it drops to the pumping cutoff water level, and the pumping is cut off when the water level drops to the pumping cutoff water level. In a standby operation pump operating method that switches to pumping cutoff operation and continues pumping cutoff operation until the water level rises to the pumping start water, immediately after the pumping operation is cut off by switching to pumping cutoff operation. The standby is characterized in that the power interrupting mechanism provided in the power transmitting means that connects the output shaft of the pump and the pump main shaft is shut off, and after a lapse of a predetermined time, the power interrupting mechanism is released to perform a pumping cutoff operation. How to operate the pump