JPH0113833Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an engine-driven pump with a vacuum pump.

BACKGROUND OF THE INVENTION Engine-driven pumps, which are generally used as fire pumps, etc., are designed to prime water into the pump body by suctioning and discharging the air inside the pump chamber with a vacuum pump when the pump is started. In conventional pumps of this type, a belt is disposed between the engine crankshaft and the main shaft of the vacuum pump, and this belt is tensioned and loosened by a tension roller, allowing the belt to be moved from the engine to the vacuum pump. The power was being cut off and on. In this case, the tension roller is driven by a solenoid, but in conventional pumps, this solenoid is connected to the battery power supply, so if the battery discharges and the voltage drops below a predetermined voltage, the solenoid cannot be operated. I had to replace the battery. There is also a system in which the solenoid is connected to a commercial power source, but this has the disadvantage that the pump can only be used in a limited number of places. In addition, when the power source is a battery or commercial power source as described above, there is a drawback that it is necessary to turn on the power switch when starting the pump, making the starting operation troublesome.

Purpose of the invention The purpose of the present invention is to provide an engine-driven pump with a vacuum pump that can automatically start and stop the vacuum pump and automate the startup of the pump.

Composition of the Invention The present invention includes a pump body, an engine that drives the pump body, a first pulley attached to the crankshaft of the engine, and an air pump in the pump chamber of the pump body that is driven by the engine. a second pulley attached to the main shaft of the vacuum pump; a belt disposed astride the first pulley and the second pulley; and the vacuum pump. When the pressure in the tension roller that tensions or loosens the belt to drive and stop the belt, the solenoid that drives the tension roller, and the pump chamber of the pump body exceeds a predetermined pressure. and a vacuum pump stop switch for cutting off energization to the solenoid, and in the present invention, a magnet generator is attached to the engine to generate the magnet power. A generator coil for driving a solenoid is provided in the machine, and the solenoid is configured to automatically return to the state before energization when the energization to the solenoid is cut off, and the coil of the solenoid stops the vacuum pump. It is connected to the output end of the generator coil for driving the solenoid via a switch.

If configured as above, you can use it anywhere,
Further, the vacuum pump can be operated automatically and reliably at any time, and the startup of the pump can be automated.

Embodiments The present invention will be explained in detail below with reference to illustrated embodiments.

FIG. 1 is a schematic configuration diagram showing the entire pump of the present invention, and FIG. 2 is an explanatory diagram of the main parts of the present invention. In these figures, 1 is an engine that drives the pump of the present invention, and this engine is connected to a crankshaft 2.
The crankcase 3 is formed into two halves, a first half 3a and a second half 3b. A pump body 4 is attached to one half 3a of the crankcase 3, and an impeller (not shown) attached to one end of the crankshaft 2 is housed within the pump body 4. A suction cap 5 for attaching a hose is attached to the shaft core of the pump body 4. A starting rope hanging drum 6, a first pulley 7, and a pulley presser 8 are attached to the other end of the crankshaft 2. A bowl-shaped flywheel 9 is fixed to the pulley holder 8, and permanent magnets 10, 10 and magnetic pole pieces 11, 11 are fixed to the inner peripheral wall of the flywheel 9. A flywheel magnet rotor is constructed. Flywheel 9 of crankcase 9
A plate-shaped stator base plate 12 is attached to the side end, and an ignition coil 13 of an ignition device for igniting the engine and a generator coil 14 for driving a solenoid are fixed to this stator base plate 12. The magnetic pole portions of the iron core are arranged opposite to the magnetic pole pieces 11, 11 of the rotor with a predetermined gap interposed therebetween. The components of the flywheel 9 and the coil 14 constitute a flywheel magnet generator 15, and the magnet generator 15 is covered with a cover 16. A vacuum pump stop switch 19 is attached to the pump body 4. The vacuum pump stop switch 19 operates a diaphragm 18 to cut off energization to a solenoid, which will be described later, when the pressure in the pump chamber 17 exceeds a predetermined pressure.
One end of a tube 20 communicating with the pump chamber 17 is connected to the pump body 4, and the other end of the tube 20 is connected to a vacuum pump 21. In the middle of the pipe 20, there is a water stop valve 22 that prevents water from flowing from the pump chamber 17 to the vacuum pump 21, and a water stop valve 22 that prevents water from flowing from the vacuum pump 21 to the pump chamber 17.
A check valve 23 is provided to prevent backflow of outside air. A rotor of the vacuum pump 21 (not shown). A second pulley 25 is attached to the main shaft 24 to which is fixed, and a belt 26 is disposed astride the second pulley 25 and the first pulley. 27 is a tension roller that tensions or loosens the belt 26, and this tension roller 27 is attached to a solenoid 28 and is operated by a lever 29.
is supported at an intermediate position. When solenoid 28 is energized, lever 29 rotates counterclockwise from the position shown in broken lines in FIG. 2 to tension belt 26, and when the solenoid coil is deenergized, lever 29 automatically rotates. The belt 26 is to be loosened by returning to the position shown in broken lines in FIG.

FIG. 3 shows an electric circuit that energizes the coil of the solenoid 28. In this example, an intermediate tap 31 is provided on the solenoid drive generating coil 14 of the flywheel magnet generator 15, and the intermediate tap is grounded. A relay 34 is connected between one end of the coil 14 and ground via a diode 32 and a resistor 33. A solenoid 28 is connected between the other end of the coil 14 and ground via a series circuit consisting of a contact 35 of a relay 34, a vacuum pump stop switch 19, and a manual switch 30. In this circuit, when the engine is started and the magnet generator 15 generates voltage, the relay 34 is excited from the generator coil through the diode 32 and resistor 33, but in this case, when the rotation speed of the engine 1 reaches a predetermined value The contact 35 of the relay 34 is closed at the same time.

In the above embodiment, the manual switch 30 is kept closed when the pump is to be started automatically. In this state, engine 1 is started,
When the rotation speed reaches a predetermined value, the contact 35 closes and current is supplied to the solenoid 28 through the vacuum pump stop switch 19 and the manual switch 30. This causes the lever 29 to rotate counterclockwise in FIG. 2, driving the tension roller 27, tensioning the belt 26, and driving the vacuum pump 21 with the output of the engine 1. vacuum pump 21
When the pump main body 4 is driven, the pump chamber 17 of the pump body 4 is evacuated, and water is primed into the pump chamber 17. When water is drawn into the pump chamber 17, the water is discharged from the pump body 4 to the outside. At this time, the pressure in the pump chamber 17 reaches a predetermined value, so the vacuum pump stop switch 19 opens, and the current to the solenoid 28 is immediately cut off. Therefore, the solenoid 28 returns to its state before energization, and the lever 29 rotates clockwise in FIG. 2 to retract the tension roller 27, loosen the belt 26, and stop driving the vacuum pump 21.

FIG. 4 shows another example of the configuration of the electric circuit that supplies current to the solenoid 28. In this example, one end of the solenoid drive generating coil 14 of the flywheel magnet generator 15 is grounded, and the other end of the solenoid driving coil 14 of the flywheel magnet generator 15 is grounded. Diode 32 between end and ground, current control resistor 3
3. Solenoid 28, vacuum pump stop switch 1
9 and a manual switch 30 are connected in series. In this circuit, the resistance value of the resistor 33 is set so that when the rotational speed of the engine 1 reaches a predetermined value, a predetermined current flows through the coil 14 of the solenoid 28 to drive the solenoid. In the circuit shown in FIG. 4, when the engine 1 is started, the solenoid 2 is connected from the magnet generator 15 through the diode 32 and resistor 33.
8 is energized, and when the rotational speed of the engine 1 reaches a predetermined value, the solenoid 28 is activated and the lever 29 is activated.
Rotate. As a result, the tension roller 27
is driven. The tension roller is the belt 26
make you nervous. Therefore, the vacuum pump 21 is driven to prime the pump chamber 17 with water. The following operations are similar to the embodiment shown in FIG.

In the above embodiment, the vacuum pump 21 may be driven and stopped manually by opening the manual switch 30 to cut off the current to the solenoid 28.

Effects of the invention As described above, according to the invention, a magnet generator is attached to the engine, and a solenoid is electrically connected to the magnet generator to drive the tension roller that applies tension to the belt that drives the vacuum pump. As a result, there is no need to replace the battery as in the case of conventionally driving the solenoid with battery power, and there are also restrictions on where it can be used, unlike in the case of driving the solenoid with commercial power. There is an advantage that there is no Further, there is an advantage that the vacuum pump can be operated automatically and reliably, and the startup of the pump can be automated.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention;
The figure is an explanatory diagram showing the main parts of Fig. 1, Fig. 3 is a circuit diagram showing an example of an electric circuit that energizes the solenoid, and Fig. 4 is a circuit diagram showing another example of the electric circuit that energizes the solenoid. be. 1...Engine, 2...Crankshaft, 4
... Pump body, 7 ... First pulley, 14 ...
Generator coil for solenoid drive, 15...Magnet generator, 17...Pump chamber, 19...Vacuum pump stop switch, 21...Vacuum pump, 24...Main shaft of vacuum pump, 25...Second pulley, 26 ...Belt, 27...Tension roller, 28...Solenoid.

Claims (1)

[Scope of utility model registration request] a pump body, an engine that drives the pump body, a first pulley attached to the crankshaft of the engine, and a vacuum for sucking and exhausting air in a pump chamber of the pump body driven by the engine. A pump, a second pulley attached to the main shaft of the vacuum pump, a belt disposed across the first pulley and the second pulley, and driving and stopping the vacuum pump. Therefore, a tension roller that tensions or loosens the belt, a solenoid that drives the tension roller, and a solenoid that energizes when the pressure in the pump chamber of the pump body exceeds a predetermined pressure. In an engine-driven vacuum pump equipped with a vacuum pump stop switch for turning off the vacuum pump, a magnet generator is attached to the engine, a generator coil for driving a solenoid is provided in the magnet generator, and the solenoid is connected to the solenoid. The coil of the solenoid is configured to automatically return to the state before energization when the energization is cut off, and the coil of the solenoid is connected to the output end of the generator coil for driving the solenoid via the vacuum pump stop switch. An engine-driven pump with a vacuum pump.