JPS61247890A - Automatic priming apparatus for pump - Google Patents

Abstract

PURPOSE:To extract the steam reliably by automatically injecting the sealed water stored in an enclosed vertical water tank during operation of pump to the suction side of pump when restarting. CONSTITUTION:Upon stoppage of pump 1, the sea water in the pump 1 and the suction pipe 9 will drop to be intruded with water. Upon starting of pump 1, starting signals are fed to a priming motor valve 13 and a solenoid valve 14 thus to open the valve. The sea water in an enclosed vertical water tank 12 will pass through said valve 13, said pump 1 and a check valve 6 to be filled in the upper suction pipe system thus to discharge the air through the solenoid valve 14 to the atmosphere. Consequently, the steam can be extracted reliably at start.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pump automatic priming device.

[Conventional technology]

Conventionally, in seawater water pumps used in ships, as shown in the system diagram in FIG. Seawater suction pipe9. After the check valve 6 is pulled out, the water passes through the check valve 7 and is discharged to the water supply light.

Here, 4 is a priming pump that exhausts the cylinder/intake system when pump 1 is started, priming pump 4 is connected to pump 1 via clutch 5, and 11 is a starting command to motor 2 or engine 3. It is a control panel that gives you the following information.

However, in such a pump system,
Since the pump 1 is located above the low water line, the seawater in the seawater suction pipe 9 will fall to the high water line level while the pump is stopped, and will also fall due to leakage of the check valve 6, so the operation panel 11 cannot be started. Even if the pump 1 is started by a command and the priming pump 4 performs air extraction operation via the clutch 5, the pump 1
and the volume of the seawater suction pipe 9 is large.This together means that it not only takes a considerable amount of time until the pump starts suctioning seawater from the seawater suction pipe 9 after completing air extraction, but also that the air extraction conditions are not met. In bad cases, seawater suction becomes impossible.

[Problem that the invention seeks to solve]

The present invention was proposed in view of the above circumstances, and it is possible to ensure air extraction at startup even if the performance of the air extraction pump and check valve is slightly poor, and to shorten the air extraction time. The purpose of the present invention is to provide a high-performance pump automatic priming device that achieves high performance.

[Means for solving problems]

To this end, the present invention connects a vertical sealed water tank to the discharge pipe of the pump, and automatically transfers sealed water stored in the vertical sealed water tank to the suction side of the pump when the pump is restarted. It is characterized by priming by injecting water into the tank.

[For production]

With this configuration, even if the performance of the air bleed pump and check valve is slightly poor, a high-performance automatic pump priming device is obtained that ensures air bleed at startup and shortens the air bleed time. be able to.

〔Example〕

An embodiment in which the present invention is applied to a marine seawater pump will be described with reference to the drawings. FIG. 1 is a system diagram thereof.

In the above figure, the same symbols as those in FIG. 14 is a solenoid valve that releases the bled air in response to the operation of the priming motor-operated valve 13; 15 is a solenoid valve that discharges bled air when priming is completed, and the pressure in the water pipe system of the pump is This is a pressure transmitter that detects when the pressure rises and issues a signal to close the priming electric valve 13 and the electromagnetic valve 14.

In such a device, when the pump is operated, the vertical sealed water tank 12 is filled with seawater during water supply, but after the pump 1 has stopped and some time has elapsed, it may leak due to leakage from the check valve 6, etc. Seawater in the pump 1 and seawater suction pipe 9 falls,
Air enters this area.

When the pump 1 is started in this state, a starting signal is first sent to the priming electric valve 13 and the solenoid valve 14, opening these valves.

Then, since the seawater in the vertical sealed water tank 12 has a sufficient pressure head with respect to the pump suction side, it passes through the priming electric valve 13 and fills the suction pipe system above the pump 1 and check valve 6. At this time, the air in the area into which the seawater has flowed is discharged to the atmosphere through the electromagnetic valve 14, so that air extraction is reliably carried out.

In this way, when the bleed stroke is completed and the pump 1 starts supplying water and the pressure rises, the pressure transmitter 15 detects this and closes the priming electric valve 13 and the solenoid valve 14, and at the same time the priming pump 4 The clutch 5 that drives the pump is automatically disengaged due to the increase in pump discharge pressure, the priming pump 4 is stopped, and the pump 1 continues water supply operation.

According to such a device, the following effects can be achieved.

(1) Even in a pump installed on a water line, when the pump is started, air extraction can be completed in a short time and water supply operation can be started.

(2) In the conventional device shown in Fig. 2, it is possible to prevent the pump's discharge pipe, suction pipe system, and sealed water inside the pump from falling over time due to leakage from the check valves 6 and 7. However, in this device, the amount of water stored in the vertical sealed water tank 12 is large, so the amount of falling water can be sufficiently compensated for.
Further, since the vertical sealed water tank 12 is arranged vertically and has a sufficient water head, it is possible to apply back pressure to the check valve 7 to ensure a seal.

(3) Furthermore, since the non-automatically operated check valves conventionally employed in the reverse valves 6 and 7 can be employed as they are, the reliability of the opening and closing operations of the valves can be obtained in the same way as in the prior art.

Incidentally, it is difficult to guarantee the operating performance of automatically operated valves used in seawater systems, especially those with large diameters, so this type of automatic operation is not recommended for pump equipment used for important applications. It is safer to avoid using type valves.

〔Effect of the invention〕

In short, according to the present invention, a vertical sealed water tank is connected to the discharge pipe of the pump, and sealed water stored in the vertical sealed water tank during operation of the pump is automatically drawn into the pump when the pump is restarted. By priming by injecting water into the side, even if the performance of the air bleed pump and check valve is slightly poor, air is reliably bled at the time of startup. The present invention is extremely useful industrially because it provides a pump automatic priming device.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment in which the present invention is applied to a marine seawater pump, and FIG. 2 is a system diagram showing a known example. FIG. 2 is a system diagram showing a priming device for a marine seawater pump. 1... Pump, 2... Motor, 3... Engine, 4... Priming pump, 5... Clutch, 6
...Check valve, 7...Check valve, 8...Seawater suction box,
9...Seawater suction pipe, 10...Seawater suction source valve, 11.
...Operation panel, 12...Vertical sealed water tank, 13...Electric valve for priming, 14...Solenoid valve, 15...Pressure transmitter. Sub-Agent Patent Attorney Masa Tsukamoto Figure 1 Figure 2

Claims (1)

[Claims] A vertical sealed water tank is connected to the discharge pipe of the pump, and sealed water stored in the vertical sealed water tank during operation of the pump is automatically transferred to the suction side of the pump when the pump is restarted. An automatic pump priming device characterized by priming by injecting water into the pump.