JPH0219161Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a priming device for starting a fire pump, which is used when starting a fire pump.

[Conventional technology]

Centrifugal pumps, which are often used as water cannon pumps for firefighting, require priming work to fill the casing with water when in use. Most type fire water pumps are equipped with a priming device for starting.

The priming device for starting a firefighting pump as described above uses a vacuum pump to evacuate and reduce the pressure inside the casing of a firefighting water pump, thereby sucking and introducing water into the casing to fill the casing.

FIG. 2 is an explanatory diagram illustrating a conventional priming device for starting a fire pump.

In Figure 2, 1 is the water discharge pump, 2 is the water suction pipe of the water discharge pump 1, 3 is the vacuum pump, and 4 is the water suction pipe 2.
an intake pipe connecting the intake port of the vacuum pump 3 and the intake port of the vacuum pump 3;
6 is an electromagnetic clutch that extracts the driving force from the water pump 1 and transmits it to the vacuum pump 3, and 6 is the vacuum pump 3.
7 is a lubricating oil tank to which the exhaust pipe 6 is connected, 8 is an oil feed pipe connecting the lubricating oil tank 7 and the vacuum pump 3, and 9 is an exhaust port provided at the top of the lubricating oil tank 7.

A steam/water separator 13 equipped with an automatic vacuum valve 10, a water sensor 11, and an electromagnetic drain valve 12 is connected to the intake pipe 4 of the vacuum pump 3 from the intake pipe 2 side.

In the above device, when the vacuum pump 3 is operated to start priming work, lubricating oil is sucked into the vacuum pump 3 from the lubricating oil tank 7 through the oil feed pipe 8, and the vacuum pump 3 is lubricated, airtight, and cooled. The air inside the water suction pipe 2 is sucked into the vacuum pump 3 through the suction pipe 4, and the inside of the water suction pipe 2 is evacuated and depressurized.

Water is supplied to the water suction pipe 2, which has been brought into a negative pressure state by the vacuum pump 3, into the water discharge pump 1, which draws water from a water source (not shown). Immediately before the water suction pipe 2 and water discharge pump 1 are filled with water, air and water flow into the suction pipe 4, but the air and water are separated by the air-water separator 13, and the vacuum pump 3, only air flows into it. Therefore, a mixture of air and lubricating oil is discharged from the exhaust pipe 6 of the vacuum pump 3, and is separated into lubricating oil and air by gravity separation or collision separation in the lubricating oil tank 7, and the air is exhausted from the lubricating oil tank 7. It is released into the atmosphere from the mouth 9,
The lubricating oil is temporarily stored in the lubricating tank 7 and then supplied to the vacuum pump 3 again.

At this time, when the water separated and remaining in the steam-water separator 13 reaches a predetermined water level or higher, the float switch built in the steam-water separator 13 operates to open the electromagnetic drain valve 12 and drain the water inside. Maintain the water level at the specified level.

Immediately before the priming work is completed, when water filling the water suction pipe 2 passes through the suction pipe 4 and reaches the water sensor 11,
The water sensor 11 disengages the electromagnetic clutch 5 to stop the vacuum pump 3 and complete the priming work.

[The problem that the idea aims to solve]

In the conventional priming device for starting a fire pump as described above, when the water separated in the steam-water separator 13 reaches a predetermined water level or higher, the float switch is activated to open the electromagnetic drain valve 12 and drain the water inside. Since the steam separator 13 is configured to discharge
A certain level of water always remains inside. If this remaining water freezes in winter, etc., the electromagnetic drain valve 12 may become inoperable, or even if the electromagnetic drain valve 12 operates, it may become impossible to drain water. In this case, the water and air introduced into the steam/water separator 13 are not separated by the steam/water separator 13, and the water passes through the vacuum pump 3 and mixes with the lubricating oil in the lubricating oil tank 7, causing lubrication of the lubricating oil. Airtightness and cooling performance were reduced.

[Means to solve the problem]

The present invention connects the suction side of a vacuum pump, which is driven by extracting power from the drive shaft of the water pump via a clutch, to the water suction pipe of the water pump, and installs a steam-water separator in the middle of the suction pipe. In the priming device for starting a fire pump, the drive shaft of the vacuum pump is connected to the drive shaft of the water discharge pump via a mechanical clutch, and the power transmission of the mechanical clutch is cut off when priming is completed. A switching mechanism for opening and closing the drain tank of the steam/water separator is connected to the hydraulic mechanism.

〔Example〕

FIG. 1 is a schematic configuration diagram illustrating an embodiment of a priming device for starting a fire pump according to the present invention.

In FIG. 1, 20 is a water pump, 21 is a vacuum pump, 22 is a mechanical clutch built into the water pump 20, and 23 is a hydraulic mechanism that automatically disconnects the mechanical clutch 22 when priming is completed. , 24 is the water suction pipe 2 of the water discharge pump 20
5 is an intake pipe connected to the intake port of the vacuum pump 21 via a water stop valve 26 and a steam/water separator 27; 28 is an oil tank that supplies lubricating oil to the vacuum pump 21;

The hydraulic mechanism 23 includes a water discharge pump 2
0 is detected by the displacement of a piston (not shown) that is pressed in one direction by a spring (not shown), and the displacement is detected by the machine via a piston rod 29 connected to the piston and a link mechanism 30. The mechanical clutch 2 is transmitted to the mechanical clutch 22.
Connect 2.

The steam/water separator 27 has a built-in check valve 31 and a float valve 32, a drain stock 33 is connected to the lower part of the steam/water separator 27, and an air vent valve 34 is connected to the upper part.

Link mechanism 30 of the hydraulic mechanism 23
A drain stock 33 and an air vent valve 34 of the steam separator 27 are mechanically connected to an operating lever 35 of the vacuum pump 21 via rods 36 and 37.

An exhaust pipe 38 of the vacuum pump 21 is connected to the upper part of the oil tank 28, and an oil supply pipe 39 to the vacuum pump 21 is connected to the lower part.

In FIG. 1, 40 is an air discharge pipe of the oil tank 28, 41 is a drain tank of the oil tank 28, 42 is an oil level gauge, and 43 is an oil filler port.

The operating procedure of the device of the present invention will be explained below.

First, when the vacuum pump 21 is activated, the lubricating oil in the oil tank 28 is sucked into the vacuum pump 21 through the oil supply pipe 39, and after lubricating, airtight, and cooling the vacuum pump 21, it is passed from the exhaust pipe 38 to the oil tank. It is discharged on the 28th. On the other hand, the air in the water intake pipe 25 is transferred to the intake pipe 24, the water stop valve 26, the steam separator 27,
The air flows into the oil tank 28 through the vacuum pump 21 and the exhaust pipe 38, and is discharged into the atmosphere from the air exhaust pipe 40 of the oil tank 28. Therefore, water suction pipe 2
5 is reduced in pressure, and water is drawn into the water suction pipe 25 from a water source (not shown) by the negative pressure.

At this time, when water flows into the intake pipe 24 from the water intake pipe 25, water and air are completely separated by the air-water separator 27 provided in the intake pipe 24, and only air is sent to the vacuum pump 21. The water remains in the steam separator 27. Therefore, a mixture of air and lubricating oil is discharged from the exhaust pipe 38 of the vacuum pump 21, and is separated into lubricating oil and air by gravity separation or collision separation in the oil tank 28, and the air is discharged from the oil tank 28. The lubricating oil is discharged into the atmosphere from the pipe 40, is temporarily stored in the oil tank 28, and is sent to the vacuum pump 21 again.

When the water suction pipe 25 and the water discharge pump 20 are filled with water and the priming work is completed, the water discharge pump 20
The hydraulic mechanism 23 is actuated by the water pressurized by the pump and the mechanical clutch 22 is switched to the disengaged state, so the vacuum pump 21 is stopped and the check valve 31 is actuated to prevent air from flowing back into the water suction pipe 25. to prevent

At the same time as the vacuum pump 21 is stopped, the piston rod 29 of the hydraulic mechanism 23 is displaced.
Since this is transmitted to the link mechanism 30, the rod 36, the operating lever 35, and the air vent valve 34, the drain stock 33 and the air vent valve 34 are opened, and the water remaining in the steam/water separator 27 is completely drained.

Furthermore, when the water introduced into the water intake pipe 25 is pressure water from a fire hydrant or other fire engine, the pressure water flows into the intake pipe 24 through the water intake pipe 25, but is not connected to the intake pipe 24. Water stop valve 26
This prevents water from flowing into the intake pipe 24 after the water stop valve 26. By the way, a failure occurred in the water stop valve 26, and the pressure water leaked into the steam/water separator 27.
When the water level of the pressure water reaches a predetermined water level, the float valve 32 is activated to close the intake pipe 24 to the vacuum pump 21, thereby preventing water from flowing into the vacuum pump 21. .

[Effect of idea]

The device of this invention mechanically connects the mechanical clutch that transmits the driving force to the vacuum pump and the drain stock of the steam/water separator, so that the drain stock is always closed when the vacuum pump is operating, and the drain stock is always open when the vacuum pump is stopped. As a result, the water in the steam/water separator is
It can be discharged reliably and completely.

In addition, as mentioned above, the water in the steam separator is completely discharged, so unlike conventional equipment, the water in the steam separator freezes and becomes impossible to discharge, and the vacuum pump No water leakage occurs.

Therefore, the device of the present invention can reliably and completely drain the water in the steam/water separator in any location or climate, so no water gets mixed in with the lubricating oil of the vacuum pump, and the lubrication oil is maintained. Oil can be reused safely.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram illustrating an embodiment of a priming device for starting a fire pump according to the present invention, and Fig. 2 is a side view illustrating a conventional priming device for starting a fire pump. 20...Water pump, 21...Vacuum pump, 2
2...Mechanical clutch, 24...Intake pipe, 25...
...Intake pipe, 27...Steam water separator, 33...Drain kettle.

Claims (1)

[Scope of Claim for Utility Model Registration] The suction side of a vacuum pump, which is driven by extracting power from the drive shaft of the water pump via a clutch, and the water suction pipe of the water pump are connected by an intake pipe, In a priming device for starting a fire pump equipped with a steam/water separator, the drive shaft of the vacuum pump is connected to the drive shaft of the water discharge pump via a mechanical clutch, and the power transmission of the mechanical clutch is primed. A priming device for starting a fire pump, characterized in that a switching mechanism for opening and closing a drain tank of the steam/water separator is connected to a hydraulic mechanism that shuts off when the water separator is completed.