JP2002332982A - Fire pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire pump capable of discharging water from a feed pump immediately after the evacuation by vacuum pumps. SOLUTION: In the fire pump, an engine drives the feed pump 2 as well as the vacuum pumps 4, and the feed pump 2 is primed by the vacuum pumps 4. Plural vacuum pumps 4 are connected to an evacuation hole 15 of the feed pump 2, and the plural vacuum pumps 4 are driven at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire pump which drives a water supply pump with an engine and also drives a vacuum pump to prime the water supply pump with the vacuum pump.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view showing a main part of a conventional fire pump. The fire pump includes a water supply pump 2 and a rotating shaft 1 which is a crankshaft of an engine (not shown).
And the rotor 5 of the vacuum pump 4 is also driven, and the vacuum pump 4 draws water from the water source 7 through the suction pipe 6 to the water supply pump 2. In the water supply pump 2, the rotor 3 rotates in the pump housing 8 to suck up water and discharge the water from the discharge port 9.
A water-fall prevention valve 10 is provided at the discharge port 9 to prevent water from falling when the engine is stopped. In the vacuum pump 4, the rotor 5 rotates in an eccentric arrangement within the pump housing 11, and the vanes 13 fitted in the slits 12 radially provided on the rotor 5 protrude in the centrifugal direction by centrifugal force, so that the pump housing 11 , So that air is projected from the discharge port 14 to evacuate. The water supply pump 2 and the vacuum pump 4 are connected to a vacuum evacuation hole 15 of the pump housing 8 of the water supply pump 2 and the vacuum pump 4.
Is connected to a suction port 16 by a hose 17 to perform evacuation.

[0003]

However, in a fire pump having such a configuration, since a single vacuum pump 4 is used to evacuate, there is a limit to the ability to reduce air accumulation in the water supply pump 2, and the fire pump has a limited capacity. There is a problem that it takes time to discharge water from the outlet 9.

[0004] It is an object of the present invention to provide a fire pump capable of discharging water from a water supply pump immediately after evacuation by a vacuum pump.

Another object of the present invention is to provide a fire pump capable of easily driving a plurality of vacuum pumps simultaneously.

[0006]

SUMMARY OF THE INVENTION The present invention is an improvement of a fire pump in which a water supply pump is driven by an engine and a vacuum pump is driven so that the vacuum pump primes the water supply pump.

The fire pump according to the present invention is characterized in that a plurality of vacuum pumps are connected to a vacuum drawing hole of a water supply pump, and these vacuum pumps are driven simultaneously by an engine.

As described above, when a plurality of vacuum pumps are connected to the evacuation holes of the feed water pump and these vacuum pumps are simultaneously driven by the engine, the ability to reduce the air pool in the feed water pump is improved as compared with the conventional case. Water can be quickly discharged from the water supply pump after the evacuation is performed by the vacuum pump.

In the fire fighting pump according to the present invention, the pulleys attached to the rotating shafts of the plurality of vacuum pumps are connected to each other so that the driven belt transmits the rotational force, and one of the pulleys is turned. The other pulley provided on the rotating shaft and the pulley attached to the rotating shaft of the engine are connected by a drive belt so as to be able to transmit and non-transmit torque, and a tension roller is provided inside the drive belt when desired. The tension roller is arranged so that it can be brought into contact with the inner surface of the drive belt, and the tension roller can contact the inner surface of the drive belt by operating the operation lever during priming and apply tension to transmit the rotational force. And

The pulleys attached to the respective rotating shafts of the respective vacuum pumps are connected to each other so as to transmit the rotating force by a driven belt, and another pulley provided on the rotating shaft for rotating one of these pulleys. And a pulley attached to the rotating shaft of the engine are connected by a drive belt so that transmission and non-transmission of torque can be performed, and a tension roller can be brought into contact with the inner surface of the drive belt when desired inside the drive belt. When the tension roller is arranged so that it can be contacted with the inner surface of the drive belt by the operation of the operation lever during priming to apply tension and transmit the rotational force, multiple vacuum pumps can be easily driven simultaneously when priming. be able to.

[0011]

1 and 2 show an example of an embodiment of a fire pump according to the present invention. FIG. 1 is a longitudinal sectional view showing the structure of a main part of a fire pump according to this embodiment. FIG. 2 is an explanatory view showing a configuration in which a plurality of vacuum pumps are simultaneously driven by an engine. In addition, the part corresponding to FIG.
The same reference numerals are given.

In the fire fighting pump of this embodiment, as shown in FIG.
The suction ports 16 of a plurality (two in this example) of vacuum pumps 4 are connected to hoses 17 respectively. This vacuum pump 4 is the same as that used conventionally (the discharge amount is the same)
I use multiple things.

As shown in FIG. 2, pulleys 19 attached to respective rotary shafts 18 of these vacuum pumps 4 are interconnected by a driven belt 20 so as to transmit a rotational force, and one of these pulleys 19 is turned. The other pulley (not shown) provided on the rotating shaft 18 and a pulley 21 attached to the rotating shaft 1 composed of the crankshaft of the engine are connected by a drive belt 22 so that torque can be transmitted and not transmitted. A tension roller 23 is arranged inside the drive belt 22 so that the tension roller 23 can be brought into contact with the inner surface of the drive belt 22 when desired. The inner surface of the driving belt 22 is brought into contact with the inner surface of the driving belt 22 to apply a tension to transmit the rotational force. In this case, the driving belt 2
Numeral 2 has a loop length longer than the length that can be bridged between the pulleys 19 and 21. The tension roller 23 is used as a clutch to transmit and non-transmit the rotational force. Other configurations are the same as those in FIG.

Next, the operation of such a fire pump will be described. When an engine (not shown) is driven, the rotation of the rotary shaft 1 causes the rotor 3 of the water supply pump 2 to start rotating.
In this state, when the operation lever 24 is manually pulled in the direction of the arrow in FIG.
5, the tension roller 23 is pulled in the same direction, and tension is applied to the drive belt 22. As a result, one pulley 19 is rotated via the drive belt 22 and the other pulley 19 is simultaneously rotated by the driven belt 20, so that
The vacuum pumps 4 are simultaneously operated. For this reason, the inside of the water supply pump 2 is simultaneously evacuated by the two vacuum pumps 4 to perform priming.

When a plurality of the vacuum pumps 4 are connected to the evacuation holes 15 of the water supply pump 2 and these vacuum pumps 4 are simultaneously driven by the engine as described above, the ability to reduce air pockets in the water supply pump 2 is improved as compared with the prior art. Water can be quickly discharged from the water supply pump 2 after the vacuum pump 4 has evacuated.

Further, pulleys 19 attached to rotating shafts 18 of a plurality of vacuum pumps 4 are connected to each other so as to transmit a rotating force by a driven belt 20, and are connected to a rotating shaft 18 which rotates one of these pulleys 19. The other pulley (not shown) provided and the pulley 21 attached to the rotary shaft 1 of the engine are connected by a drive belt 22 so that the transmission and non-transmission of the rotational force can be performed.
A tension roller 23 is disposed inside the drive belt 22 so that the tension roller 23 can be brought into contact with the inner surface of the drive belt 22 when desired, and the tension roller 23 contacts the inner surface of the drive belt 22 by operating the operation lever 24 at the time of priming. When the tension is applied to transmit the rotational force, the plurality of vacuum pumps 4 can be easily driven simultaneously at the time of priming.

In the above example, the water supply pump 2 is evacuated by two vacuum pumps 4. However, the present invention is not limited to this, and the water supply pump 2 is evacuated by three or more vacuum pumps 4. You can also.

As another structure for obtaining the same performance as that of the present invention, it is conceivable to increase the outer diameter by using a single vacuum pump 4. The circumferential speed of the vane 13 supported by the rotor 5 in the rotor 11 is increased, and problems such as wear and breakage of the vane 13 tend to occur, which is not preferable.

It is also conceivable to increase the size of the vacuum pump 4 by increasing the length in the axial direction by using a single vacuum pump 4. However, in this case, it is difficult to maintain the accuracy in the axial direction, and It is difficult to secure a good clearance between the motor and the stator, which is not preferable.

[0020]

In the fire fighting pump according to the present invention, a plurality of vacuum pumps are connected to the evacuation holes of the water supply pump, and these vacuum pumps are simultaneously driven by the engine. Better than before,
Water can be quickly discharged from the water supply pump after the evacuation is performed by each vacuum pump. Therefore,
Fire fighting activities can be performed quickly, and good results can be obtained even in firefighting competitions since the time from start to water discharge is short. Further, according to the present invention, since the water absorption time using the vacuum pump can be shortened, the burden such as wear of the vacuum pump can be reduced. Also, if multiple vacuum pumps are used, even if one fails,
Water can be absorbed by another vacuum pump, and fire extinguishing activities can be performed without any trouble. Further, when performance equivalent to that of the related art is sufficient, the rotation speed of the vacuum pump can be reduced to half that of the related art, and the burden such as wear of the vacuum pump can be reduced.

In the fire pump according to the present invention, the pulleys attached to the respective rotating shafts of the respective vacuum pumps are connected to each other so as to transmit the rotating force by a driven belt, and are connected to the rotating shaft that rotates one of these pulleys. The other pulley (not shown) provided and the pulley attached to the rotating shaft of the engine are connected by a drive belt so that transmission and non-transmission of rotational force can be performed. A tension roller is provided inside the drive belt when desired. The tension roller is placed in such a way that it can contact the inner surface of the drive belt. The pump can be easily driven simultaneously at the time of priming.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a main configuration of an example of an embodiment of a fire pump according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration in which a plurality of vacuum pumps are simultaneously driven by an engine in the present invention.

FIG. 3 is a longitudinal sectional view showing a configuration of a main part of a conventional fire pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary shaft 2 Water supply pump 3 Rotor 4 Vacuum pump 5 Rotor 6 Suction pipe 7 Water source 8 Pump housing 9 Discharge port 10 Water-drop prevention valve 11 Pump housing 12 Slit 13 Vane 14 Discharge port 15 Vacuum hole 16 Suction port 17 Hose 18 Rotating shaft 19 Pulley 20 Follower belt 21 Pulley 22 Drive belt 23 Tension roller 24 Operation lever 25 Connecting arm

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akiko Asami 3-4-9 Shozuzawa, Itabashi-ku, Tokyo To Hats Inc.

Claims (2)

[Claims] 1. A fire pump that drives a water supply pump with an engine and also drives a vacuum pump to prime the water supply pump with the vacuum pump. A plurality of the vacuum pumps are connected to a vacuum drawing hole of the water supply pump. The fire pump is characterized in that these vacuum pumps are driven simultaneously. 2. A pulley attached to each rotary shaft of a plurality of vacuum pumps is connected to each other so as to transmit a rotational force by a driven belt, and is provided on the rotary shaft for rotating one of these pulleys. The other pulley and the pulley attached to the rotation shaft of the engine are connected by a drive belt so as to be able to transmit and non-transmit torque, and a tension roller is provided inside the drive belt when desired. The tension roller is disposed so as to be able to contact the inner surface, and the tension roller is configured to be able to contact the inner surface of the drive belt by operating a control lever at the time of priming and transmit a rotational force by applying tension. The fire pump according to claim 1.