JPS637427Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an auxiliary power supply device for an engine-driven welding machine, and in particular, an inverter device is connected to the output terminal of the auxiliary power supply to obtain commercial power, and a charging circuit for a storage battery is connected to the output terminal. The present invention relates to an auxiliary power supply device that enables continuous operation of medium-capacity battery welding devices and battery inverter devices and can be used for various purposes.

Conventionally, when performing welding work outdoors, in addition to the welding work, it has been necessary to use a grinder to finish the bead surface after welding, power tools for drilling holes, and a commercial frequency auxiliary power source for lighting during night work. Conventionally, in order to obtain the auxiliary power source, an alternating current generator for the auxiliary power source was directly connected to the welding generator, or a belt drive was used. Another method used was a winding type in which a winding for an auxiliary power source was wound around a welding generator.

However, according to the above method, since the auxiliary power generator must obtain a commercial frequency, the number of poles and rotation speed of the generator is 50Hz, and in the case of two poles,
In the case of 3000 rpm 4 poles, the structure is limited to 1500 rpm. Therefore, the rotational speed of the main welding machine is determined by the auxiliary power generator and rotates at a relatively high speed, which becomes a source of noise.

On the other hand, in recent years, due to noise and exhaust gas pollution problems, devices using batteries as a power source have been used in densely populated areas, nighttime work, and construction sites such as tunnel construction. However, in battery welding equipment and battery inverter equipment that use a battery as a power source, for example, in order to carry out large current welding work for a long time, it is impossible to work continuously unless the battery is constantly charged. In addition, even when working with a small current for a short time, if the battery is not charged at the end of the day's work, it will be impossible to use the next day, and furthermore, it may become impossible to recharge the battery. Due to these circumstances, when a commercial power source was not available at the work site, the only option was to take the battery back to the factory after the work was completed, charge it, and then transport it to the site the next day. Furthermore, when the distance between the welding work and the work site of the power tool is far, it is necessary to extend the cable longer than the machine body, which poses various problems, especially in the case of tunnel construction and the like.

In addition to the auxiliary power output, some machines are equipped with a terminal dedicated to battery charging, but the output voltage is only a small capacity terminal of 12V or 24V, so it is not suitable for charging devices that consume large currents such as battery welders. It could not be used as a power source, and an engine generator dedicated to battery charging had to be installed in addition to the welding machine.

This invention was made to solve the above problems, and by connecting an inverter device to the output voltage of the auxiliary generator as a direct current, low voltage, power source,
It makes it possible to take out an auxiliary AC output of a commercial frequency, and also makes it possible to charge a storage battery with the auxiliary output terminal, and to use it as a charging power source for a battery welder, and to enable parallel use of an engine welder and a battery welder, Another object of the present invention is to provide an auxiliary power supply device for an all-purpose engine welding machine that can be used inside a tunnel by being separated from the main body of the engine welding machine, since the auxiliary power supply is a separate type.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the mutual relationship between a stator and a rotor in a welding inductor type generator with AC auxiliary output (Utility Application No. 53-37368) proposed by the applicant. FIG. 2 is an electrical connection diagram of an embodiment according to the present invention. In the figure, 2 is a stator core of an inductor type generator, and 7 is an inductor with salient poles formed thereon. The stator core 2 is wound with a groove 3 in which the field winding 1 of the welding generator is wound at a predetermined interval, and a welding armature winding 6a is wound with a predetermined number of turns, and the excitation armature winding is also wound with a predetermined number of turns. The armature 10 of the auxiliary generator is wound around the bottom of the recess 8a of the inductor 7, and a slip ring is provided on the rotating shaft of the inductor 7 to take out the output of the auxiliary generator. 1
2 is provided. In FIG. 2, 52 represents an excitation circuit, 6C represents a current transformer for compensating the excitation power source, and 51 represents a rectifier circuit for outputting welding current. Therefore, when the field winding 1 is initially excited by a battery (not shown), the field magnetic flux becomes residual magnetic flux and is held in the stator core. Therefore, as the inductor 7 rotates, the field magnetic flux changes depending on the magnitude of the magnetic resistance due to the recess 8a, resulting in a fluctuating magnetic flux, and this change is picked up by the excitation armature winding 6b, resulting in an induced electromotive force. is generated, an excitation current is supplied to the field winding 1 through the rectifier Re ₂ , and the field magnetic flux generated thereby generates an induced electromotive force as a large fluctuating magnetic flux. Generates electricity as an inductor generator through self-excitation. On the other hand, the armature winding 10 of the auxiliary generator provided in the lower part 9 of the recess 8a of the inductor 7 is connected to the field winding 1.
By cutting the magnetic flux generated by the motor, a rotating electromotive force is generated and power is supplied to the auxiliary output.

In the embodiment of the present invention, in the already proposed inductor type generator, the number of turns of the armature 10 of the auxiliary generator is provided with the output terminal 16 of the rectifier circuit 14 via the slip ring 12, and the output The voltage at the terminal is wound so that the voltage necessary for charging the storage battery can be taken out, and the output terminal 16 has a
The input terminal of a separately installed SCR inverter 15 is switchably connected as a separately installed auxiliary power supply device that can obtain commercial frequency power.

Note that 15 is an example of a known SCR inverter, and RE ₁ and RE ₂ are rectifiers CR ₁ and CR ₂
is a control rectifier, C is a commutation capacitor, L is a reactor, T is a transformer, E is a DC power supply, and W is a load.

With the above configuration, in this embodiment, the welding work is performed using the welding current from the output terminals 53, 53' of the rectifier circuit 51, and at the same time, the welding current is applied to the output terminal 16 of the rectifier circuit 14 via the slip ring 12. DC voltage can be extracted. Therefore, for example, a 200A class small engine-driven welding machine is usually equipped with an auxiliary power source with a capacity of about 1KVA, and by using the device of the present invention, it can be used for multiple purposes as shown in Figure 3. It is something.

(a) From output terminals 53, 53' as a welding power source
Welding work of about 200A is possible, and at the same time, the output terminal 16 of the rectifier circuit can be connected via the slip ring 12.
By connecting the input of the SCR inverter 15 to the load of the inverter, e.g.
Power tools and lighting equipment with a capacity of AC100V, 50Hz, and 1KVA can be connected.

(b) From output terminals 53, 53' as a welding power source
At the same time as welding 200A, output terminal 1
6 for charging the storage battery of the battery welder, the storage battery can always receive 20A.
It is possible to supply a charging current of about
It can perform continuous welding of about 130A at the same time as an engine-driven welder and as a battery welder.

(c) From output terminals 53' and 53' as a welding power source
At the same time as welding 200A, output terminal 1
By connecting 6 for charging the storage battery of the battery inverter, if a charging current of about 20A is supplied to the storage battery, the battery inverter of about 3KVA can be operated, and the load terminal of the inverter can be used as an auxiliary power source to generate AC100V, 50Hz capacity.
Can be used for power tools etc. with power up to 3KVA.

(d) By extracting the welding current from the output terminal as a welding power source and at the same time connecting a storage battery to the output terminal 16 of the auxiliary power source, it can be used as a charging current for the storage battery.

(e) Charge the storage battery while welding during the day in the conditions described in (d) above, and use the storage battery as a power source to power the engine during night work where noise is a problem or when working in tunnels where exhaust gas is a problem. Independently of the drive welder, a battery inverter or a battery welder can be used.

In the above embodiment, (a) the RPM of the engine-driven welding machine can be freely selected regardless of the commercial frequency, which is a necessary condition for an auxiliary power source. In other words, by adopting this embodiment, the engine RPM can be set to a low speed and the generator can be made into a high-speed, high-frequency generator by increasing the gear speed, thereby reducing engine noise, which is a noise source, and is advantageous in terms of noise pollution countermeasures, and the main body of the device can be made small and lightweight.

(b) At the same time as welding work, the auxiliary power terminal can be connected to charge a storage battery or to the input of a separately installed inverter to power lighting or power tools.

(c) By connecting the storage battery charging control device of the battery welder to the output terminal of the auxiliary power source, it can also be used as a battery welder, and it is also possible to use two welding machines at the same time.

(d) If it is necessary to use lighting or power tools in a tunnel, for example, away from the engine welding machine, the separately installed inverter and storage battery according to this embodiment can be combined and transported into the tunnel. This brings about important practical effects such as being able to meet the above-mentioned demands.

Although the embodiment of the present invention has been described with respect to an inductor type generator for welding, it can be used not only for inductor type generators but also for all types of generators.

As described above, according to the auxiliary power supply device for an engine-driven generator according to the present invention, in an engine-driven welding machine equipped with an auxiliary power generator with a DC low voltage output, direct current is supplied to the auxiliary power generator. In addition to welding using the main output of the engine-driven welding machine, it is also possible to drive tools that require auxiliary AC power from the auxiliary power generator via the inverter. When obtaining AC auxiliary power, the inverter simply receives the DC auxiliary power from the auxiliary power generator of the engine-driven welding machine, and converts it into auxiliary AC output at a certain frequency within the inverter, so it can be used to obtain the desired auxiliary power as usual. There is no need to increase the rotation speed of the engine-driven welding machine itself in order to obtain the frequency of the AC output, and as a result, an increase in noise can be prevented, and the inverter is installed separately from the engine-driven welding machine. Therefore, it is possible to disconnect the inverter from the engine-driven welding machine and connect other components such as a battery, which is extremely convenient.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the mutual relationship between a stator and a rotor in a welding inductor generator with AC auxiliary output that the applicant has already proposed, and Fig. 2 is an electrical connection of an embodiment of the present invention. It is a diagram. FIG. 3 is an explanatory diagram showing an outline of an embodiment of the present invention. 1... Field winding, 2... Stator core, 3... Field winding storage groove, 5... Armature storage groove of welding generator, 6a... Armature winding of welding generator line, 6b
...Armature winding for excitation, 7...Rotor core, 8...
... salient pole of inductor, 9 ... groove for storing armature for auxiliary power supply, 10 ... armature for auxiliary power supply, 12 ... slip ring, 13 ... storage battery, 14 ... rectifier circuit,
15...SCR inverter, 16...changeover switch.

Claims (1)

[Scope of utility model registration request] In addition to having an armature winding for an auxiliary power source that outputs AC low voltage on the rotor side, we also have a welding armature winding for a welding generator whose rotation speed changes due to load fluctuations, and a welding armature winding that is compensated by the detected load current. The engine-driven inductor type welding machine is equipped with a field winding and an armature winding dedicated to excitation on the stator side, and the slip ring and rectifier circuit of the armature winding of the generator for auxiliary power supply are provided. An engine drive comprising: a storage battery that is charged at an output terminal via an output terminal; and a separately installed SCR inverter connected to a terminal of the charged storage battery or an output terminal of the auxiliary power generator. Auxiliary power supply for welding machines.