JP6797368B2 - Operation control system and operation control method for horizontal axis mixed flow pump - Google Patents

Description

The present invention relates to an operation control system and an operation control method for a horizontal axis mixed flow pump in which the water in the pump is dropped after the operation of the pump is stopped and the water remaining in the casing is drained.

An example of a horizontally-axis mixed flow pump that has been conventionally used will be briefly described with reference to FIGS. 2 and 3. FIG. 2 is an overall structural view of a conventional horizontal axis mixed flow pump.
FIG. 3 is a cross-sectional view of a main part of a conventional horizontal axis mixed flow pump.
In FIG. 3, the horizontal axis mixed flow pump 1 drains the water from the suction water tank 2 to the discharge water tank 3, and is installed on the equipment installation floor 4 above the suction water tank 2 at the pump station. A speed reducer (not shown), an electric motor 5, and the like are installed on the equipment installation floor 4, and the horizontal axis mixed flow pump 1 is driven by the electric motor 5 via the speed reducer.
The suction water tank 2 is provided with a water level gauge 6 for measuring the water level.

The horizontal axis mixed flow pump 1 includes a pump casing 7 in which an impeller and a guide vane are arranged. A suction pipe 9 is connected to the suction side of the pump casing 7 via a suction elbow 8, and the suction pipe 9 opens below the water surface of the suction water tank 2.
A discharge pipe 11 is connected to the discharge side of the pump casing 7 via a discharge valve 10, and the discharge port of the discharge pipe 11 is open in the discharge water tank 3. A check valve 12 is provided at the discharge port of the discharge pipe 11.
The impeller is attached to a spindle rotatably supported by an underwater bearing arranged in the pump casing 7, and the spindle extends to the outside of the suction elbow 8 via a shaft sealing mechanism.

Further, an exhaust port 13 is bored in the upper part of the pump casing 7, and the exhaust port 13 communicates with the full water detector 14, and one end of the intake pipe 15 communicates with the full water detector 14. Therefore, the intake pipe 15 communicates with the pump casing 7 via the full water detector 14. The intake pipe 15 is branched into two, one branch is communicated with the vacuum pump 17 via the intake valve 16, and the other branch is released to the atmosphere via the vacuum break valve 18.

The discharge valve 10, the intake valve 16, the vacuum break valve 18, the electric motor 5, and the vacuum pump 17 are connected to the control device 19 and are controlled by signals received from the full water detector 14 and the water level gauge 6.
The control device 19 determines whether or not the water level in the suction water tank 2 has reached the start water level or the stop water level based on the measurement result of the water level gauge 6, and controls the start / stop of the horizontal axis mixed flow pump 1. ..

When starting the horizontal axis mixed flow pump 1, the intake valve 16 is first opened and the vacuum pump 17 is started.
As a result, the air in the pump casing 7 is exhausted, and the water in the suction water tank 2 is sucked into the pump casing 7.
When the sucked water reaches the upper part of the pump casing 7 and further reaches the full water detector 14, the full water detector 14 detects that the pump casing 7 is full.
After that, the intake valve 16 is closed, the electric motor 5 is started, and the discharge valve 10 is opened.
As a result, the impeller in the pump casing 7 rotates, and the water in the suction water tank 2 is continuously sucked into the pump casing 7 and discharged into the discharge water tank 3 through the discharge pipe 11 and the discharge port.

When stopping the horizontal axis mixed flow pump 1, first, the discharge valve 10 is closed and the breaker (not shown) is turned off to stop the electric motor 5. After that, by opening the vacuum break valve 18, intake is performed from the intake pipe 15, and the water in the pump casing 7 falls from the suction pipe 9. As a result, the horizontal axis mixed flow pump 1 is stopped. After that, the vacuum break valve 18 is closed.

Here, as shown in FIG. 3, the pump casing 7 of the horizontal axis mixed flow pump 1 is composed of an upper casing 7a and a lower casing 7b. Further, in order to accommodate the impeller in the pump casing 7, the upper casing 7a and the lower casing 7b are each curved and formed. Therefore, if air is flowed in from the vacuum break valve 18 of the intake pipe 15 communicating with the upper casing 7a to drop the water in the pump casing 7, the water remains in the lower casing 7b.
Therefore, a drain pipe 20 for draining the residual water is connected to the drain port 22 in the lower casing 7b.
The drain pipe 20 is provided with a casing drain valve 21, and after draining the water in the pump casing 7, the casing drain valve 21 of the drain pipe 20 is opened to drain the water remaining in the lower casing 7b.

In the conventional horizontal axis mixed flow pump, when the water remaining in the lower casing of the pump casing is drained after the water in the pump casing is dropped, the casing drain valve provided in the drain pipe is manually opened. Whenever the horizontal axis mixed flow pump is stopped, the operator must operate the casing drain valve, and if drainage is neglected, the residual water will rot and the pump casing and impeller will corrode, resulting in freezing in cold regions. The casing will be damaged. Further, if the casing drain valve is forgotten to be closed after drainage, intake air is taken from the drain pipe when the horizontal axis oblique flow pump is started, resulting in a start failure.
The present invention provides an operation control system and an operation control method for a horizontal axis mixed flow pump capable of automatically discharging water remaining in a pump casing without the hands of an operator.

An intake pipe provided with an intake valve is communicated to the upper part of the pump casing in which the impeller is arranged via a full water detector, and a drain pipe provided with a casing drain valve is communicated to the lower part of the pump casing through the pump casing discharge side. In the operation control system of the horizontal axis mixed flow pump provided with a discharge valve, when the water level gauge of the suction water tank detects the starting water level of the horizontal axis mixed flow pump, the casing drain valve and the discharge valve are closed, the intake valve is opened and the intake is taken. After operating the vacuum pump connected to the pipe and the full water detector detects full water, close the intake valve, open the discharge valve and start the horizontal axis mixed flow pump, and the water level gauge of the suction water tank is the horizontal axis mixed flow pump. when detecting stop level, after closing the discharge valve stop abscissa mixed flow pump and opening the casing drain valve, as well as drain water in the pump casing from the suction pipe with suction from the drain pipe, a pump By providing a control device that controls the water remaining in the lower part of the casing to fall from the drain pipe, the water can be dropped from the pump casing without the need for a vacuum break valve, and the casing drain valve provided in the drain pipe is automatically installed. Since it opens and closes, the burden on the operator can be reduced and accidents due to human errors can be prevented.

An intake pipe provided with an intake valve is communicated with the upper part of the pump casing in which the impeller is arranged, a drain pipe provided with a casing drain valve is communicated with the lower part of the pump casing, and a discharge valve is provided on the discharge side of the pump casing to provide a casing drain. In the operation control method of the horizontal axis mixed flow pump that automatically opens and closes the valve, when starting the horizontal axis mixed flow pump, the casing drain valve and the discharge valve are closed, the intake valve is opened, and the vacuum pump connected to the intake pipe is operated. When the horizontal axis mixed flow pump is filled with water, the intake valve is closed, the discharge valve is opened to start the horizontal axis mixed flow pump, and the horizontal axis mixed flow pump is stopped, the discharge valve is closed and the horizontal axis diagonal flow is oblique. After stopping the flow pump, the casing drain valve is opened to take in air from the drain pipe and drain the water in the pump casing from the suction pipe , and then drain the water remaining in the lower part of the pump casing from the drain pipe. Successful time of re-driving the horizontal axis mixed flow pump After the water from the casing drain valve closes automatically, to reduce the burden on the operator can be prevented an accident caused by human error.

In the present invention, the casing drain valve can be automatically opened and closed by the control device, and by opening and closing when the pump is started and stopped, the vacuum break valve which has been conventionally required becomes unnecessary. Since the casing drain valve opens and closes automatically when the pump starts and stops, the burden on the operator is reduced, human error such as forgetting to close the casing drain valve is eliminated, and the maintenance and reliability of the pump can be improved. it can.
In addition, since the drain pipe is opened below the equipment installation floor, the intake noise is blocked by the equipment installation floor to prevent it from echoing in the pump station.

It is an overall structural view of the horizontal axis mixed flow pump which concerns on this invention. It is an overall structure view of the conventional horizontal axis mixed flow pump. It is sectional drawing of the main part of the conventional horizontal axis mixed flow pump.

FIG. 1 is an overall structural view of a horizontal axis mixed flow pump according to the present invention.
The description of the same configuration as that of the prior art will be omitted by appropriately assigning the same reference numerals.
An exhaust port 13 is bored in the upper casing 7a of the pump casing 7, the exhaust port 13 communicates with the full water detector 14, and one end of the intake pipe 15 communicates with the full water detector 14. The intake pipe 15 communicates with the vacuum pump 17 via the intake valve 16.

Since the pump casing 7 accommodates the impeller, the lower casing 7b is formed in a curved shape. Then, a drain port 22 is bored in the lower casing 7b, and the drain port 22 is communicated with the drain pipe 20. The drain pipe 20 extends from the lower casing 7b below the equipment installation floor 4 into the suction water tank 2 and is opened via the casing drain valve 21. Further, the drain pipe 20 is opened at a position higher than the stop water level of the horizontal axis mixed flow pump 1.
The casing drain valve 21 can be operated by the control device 19 by using an electric valve.

When the full water detector 14 and the water level gauge 6 detect the water level, detection signals are sent to the control device 19, respectively, to operate the discharge valve 10, the intake valve 16, the casing drain valve 21, the electric motor 5, and the vacuum pump 17.
The control device 19 determines whether or not the water levels in the suction water tank 2 and the pump casing 7 have reached the start and stop water levels based on the measurement results of the water level gauge 6 and the full water detector 14, and the horizontal axis oblique flow. The pump 1 is started and stopped.

When the water level gauge 6 in the suction water tank 2 detects that the water level has risen above a predetermined water level, the control device 19 controls to start the horizontal axis mixed flow pump 1.
When starting the horizontal axis mixed flow pump 1, first, the discharge valve 10 is closed, the casing drain valve 21 is closed, and the intake valve 16 is opened. Then, by starting the vacuum pump 17, the air in the pump casing 7 is exhausted, and the water in the suction water tank 2 is sucked into the pump casing 7. When the sucked water reaches the upper part of the pump casing 7 and further reaches the full water detector 14, the full water detector 14 detects that the pump casing 7 is full.

When the pump casing 7 is full, the intake valve 16 is closed and the electric motor 5 is started to rotate the impeller arranged in the pump casing 7. Then, by opening the discharge valve 10, the water in the suction water tank 2 is continuously sucked into the pump casing 7 and discharged into the discharge water tank 3 through the discharge pipe 11 and the discharge port.

When the water level gauge 6 detects that the water level in the suction water tank 2 has dropped below a predetermined water level due to the operation of the horizontal axis mixed flow pump 1, the control device 19 controls to stop the horizontal axis mixed flow pump 1.
When stopping the horizontal axis mixed flow pump 1, first, the discharge valve 10 is closed and the breaker (not shown) is turned off to stop the electric motor 5.

After that, when the casing drain valve 21 is opened, the air is taken in from the drain pipe 20 and the water in the pump casing 7 falls from the suction pipe 9 into the suction water tank 2. When the water level drops in the pump casing 7 due to falling water, water remains in the curved lower casing 7b of the pump casing 7.
The water remaining in the lower casing 7b falls from the drain pipe 20 into the suction water tank 2, and the water is completely drained from the inside of the pump casing 7. When water falls from the drain pipe 20, air is taken in from the drain pipe 20 at the same time.

When the water level of the suction water tank 2 rises again, the control for operating the horizontal axis mixed flow pump 1 is performed, and the casing drain valve 21 is closed.

As described above, the casing drain valve 21 provided in the drain pipe 20 communicating with the lower casing 7b is automatically opened and closed by the control device 19 in accordance with the operation of the horizontal axis mixed flow pump 1, so that the curved lower casing No water remains in 7b, and it is not necessary for the operator to operate the casing drain valve 21 every time the horizontal axis mixed flow pump 1 is started or stopped.

1 Horizontal axis mixed flow pump 2 Suction water tank 6 Water level gauge 7 Pump casing 10 Discharge valve 14 Full water detector 15 Intake pipe 16 Intake valve 17 Vacuum pump 19 Control device 20 Drain pipe 21 Casing drain valve

Claims (2)

An intake pipe (15) provided with an intake valve (16) is communicated with the upper part of the pump casing (7) in which the impeller is arranged via a full water detector (14).
A drain pipe (20) provided with a casing drain valve (21) is communicated with the lower part of the pump casing (7).
In the operation control system of the horizontal axis mixed flow pump provided with the discharge valve (10) on the discharge side of the pump casing (7).
When the water level gauge (6) of the suction water tank (2) detects the horizontal axis mixed flow pump (1) starting water level,
Close the casing drain valve (21) and discharge valve (10),
The intake valve (16) was opened and the vacuum pump (17) connected to the intake pipe (15) was operated.
After the full water detector (14) detects full water, the intake valve (16) is closed, the discharge valve (10) is opened, and the horizontal axis mixed flow pump (1) is started.
When the water level gauge (6) of the suction water tank (2) detects the horizontal axis mixed flow pump (1) stop water level,
After closing the discharge valve (10) and stopping the horizontal axis mixed flow pump (1), the casing drain valve (21) is opened to take in air from the drain pipe (20) and from the suction pipe (9) to the pump casing ( 9). The horizontal axis oblique flow pump is provided with a control device (19) for draining the water in the pump casing (7) and for controlling the water remaining in the lower part of the pump casing (7) to fall from the drain pipe (20) . Operation control system. A drain pipe (15) having an intake valve (16) on the upper part of the pump casing (7) on which the impeller is arranged communicates with the drain pipe (15) having a casing drain valve (21) on the lower part of the pump casing (7). 20) In the operation control method of the horizontal axis mixed flow pump in which a discharge valve (10) is provided on the discharge side of the pump casing (7) and the casing drain valve (21) is automatically opened and closed.
When starting the horizontal axis mixed flow pump (1)
Close the casing drain valve (21) and discharge valve (10),
After opening the intake valve (16) and operating the vacuum pump (17) connected to the intake pipe (15) to fill the horizontal axis mixed flow pump (1) with water,
The intake valve (16) is closed, the discharge valve (10) is opened, and the horizontal axis mixed flow pump (1) is started.
When stopping the horizontal axis mixed flow pump (1)
After closing the discharge valve (10) and stopping the horizontal axis mixed flow pump (1), the casing drain valve (21) is opened to take in air from the drain pipe (20) and from the suction pipe (9) to the pump casing ( 9). A method for controlling the operation of a horizontal axis mixed flow pump, which comprises draining the water in 7) and then dropping the water remaining in the lower part of the pump casing (7) from the drain pipe (20) .

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