JP5371529B2 - Engine generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine generator in which an output is interrupted to protect the generator and a load and prevent electrical shock as well when a voltage change switch is wrongly operated after an engine is started. <P>SOLUTION: The engine generator includes a voltage setting switch 21 which selects a voltage that is output from a synchronous generator 11 driven by an engine through a circuit breaker. It includes a circuit breaker releasing means which interrupts an output to an output terminal by releasing a contact point 13 of the circuit breaker when the voltage setting switch is wrongly operated during power generation. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an engine generator, and more particularly to an engine generator that can switch an output voltage of a generator by a switch provided on an operation panel.

  In a portable engine generator in which a synchronous generator is driven by a diesel engine or the like, the output voltage is switched according to the installation location and purpose of use of the generator. If the output voltage is incorrect, the generator may be damaged or the load connected to the generator may be damaged. Check the output voltage before starting the engine and operating the generator. Are provided with a voltage change switch for changing the output voltage and a confirmation switch having a switching position corresponding to the changeable voltage so that the generator can be output only when the positions of both switches coincide (for example, patents) Reference 1), after starting the engine, a circuit is proposed that protects the generator and the load without changing the output voltage even if the voltage change switch is operated (for example, see Patent Document 2). .)

JP 2006-87268 A Japanese Patent Laid-Open No. 10-210797

  However, in the case described in Patent Document 1, if the voltage change switch is erroneously operated after the engine is started, the output voltage changes, which may cause damage to the load or the generator. However, if the voltage change switch is operated incorrectly after starting the engine, the output voltage will not change at that time, but if the engine is stopped and restarted after operating the voltage change switch incorrectly, Since the output voltage is different, the load and the generator may be similarly damaged. In addition, the configuration of the electric circuit is complicated, which may increase the cost.

  Accordingly, an object of the present invention is to provide an engine generator capable of protecting the generator and the load by interrupting the output when the voltage change switch is mistakenly operated after starting the engine, and preventing an electric shock accident.

  In order to achieve the above object, a first configuration of an engine generator according to the present invention is an engine generator including a voltage setting switch for switching and setting a voltage output from a synchronous generator driven by an engine via a circuit breaker. The voltage setting switch includes a voltage setting position for selecting and setting any one of a plurality of output voltages, and an intermediate position away from the voltage setting position, and the voltage setting switch includes the intermediate position. And a circuit breaker opening means for opening the circuit breaker when the normally open contact is on.

  According to a second configuration of the engine generator of the present invention, in the engine generator having a voltage setting switch for switching and setting a voltage output from the synchronous generator driven by the engine via the circuit breaker, the voltage setting is performed. The switch includes a voltage setting position for selecting and setting any one of a plurality of output voltages, and an intermediate position separated from the voltage setting position, and when the voltage setting switch is in the voltage installation position It is characterized by comprising a normally closed contact that is turned off and a circuit breaker opening means that opens the circuit breaker when the normally closed contact is turned on.

  Furthermore, a third configuration of the engine generator of the present invention is the engine generator including a voltage setting switch that switches and sets a voltage output from the synchronous generator driven by the engine via the circuit breaker. The switch includes a voltage setting position for selecting and setting any one of a plurality of output voltages, and an intermediate position separated from the voltage setting position, and when the voltage setting switch is set to the voltage installation position. A normally open contact that is ON, a normally closed contact that is OFF when the normally open contact is ON, and a breaker opening means that opens the breaker when the normally closed contact is ON. The circuit breaker opening means is provided with a power generation detection normally open contact for turning on the synchronous generator during power generation so that the circuit breaker opening means can be operated. Features It is.

  According to the engine generator of the present invention, when the voltage setting switch is mistakenly operated during power generation, the circuit breaker opening means is activated to open (trip) the circuit breaker and interrupt the output to the load. An output voltage different from the setting can be prevented from being supplied to the load, and the load and the generator can be protected.

It is an electric circuit diagram of the voltage setting switch which shows the 1st form example of the engine generator of this invention. It is a front view of a voltage setting switch. It is an electric circuit diagram of the circuit breaker opening means. It is explanatory drawing which shows the connection state of an armature coil when an output voltage is a high voltage. It is explanatory drawing which shows the connection state of an armature coil when an output voltage is a low voltage. It is an electric circuit diagram of the voltage setting switch which shows the 2nd example of an engine generator of this invention. FIG. It is an electric circuit diagram of the circuit breaker opening means. It is an electric circuit diagram of the circuit breaker opening means which shows the 3rd example of an engine generator of the present invention. It is an electric circuit diagram of the circuit breaker opening means which shows the 4th example of an engine generator of the present invention.

  First, a portable engine generator that generates power by driving a synchronous generator with an engine divides the armature coil of the synchronous generator into two parts, and connects the two divided armature coils in series to generate a high voltage. The armature coils divided into two are connected in parallel to output a low voltage.

  That is, as shown in FIGS. 4 and 5, the synchronous generator 11 includes the U-phase, V-phase, and W-phase three-phase armature coils 12 that are connected to the neutral coil O on the outer side. The output voltage can be switched between a high voltage and a low voltage by dividing the coil 12b into two and connecting them in series or in parallel.

  As shown in FIG. 4, by connecting the contacts at positions indicated by circles 1 in the figure, the outer end U2 of the inner coil 12a in the U phase and the inner end X1 of the outer coil 12b are connected, and in the V phase. The outer end V2 of the inner coil 12a and the inner end Y1 of the outer coil 12b are connected, the outer end W2 of the inner coil 12a and the inner end Z1 of the outer coil 12b in the W phase are connected, and the inner and outer coils are connected in series. It will be in the state. As a result, a high voltage (for example, 400V or 440V) is generated at the outer ends U1, V1, and W1 of the outer coils 12b, and a high-voltage three-phase is generated at the output terminal (not shown) through each contact 13 of the circuit breaker. AC is output. At the time of this high voltage output, since a potential difference is generated between U1 and U2 in the U phase, the high voltage operation lamp 14a is lit, and X1 and U2 are short-circuited and no potential difference is generated, so the low voltage operation lamp 14b is It goes out.

  On the other hand, as shown in FIG. 5, by connecting the contacts at the positions indicated by circles 2 in the figure, the outer end U2 of the inner coil 12a and the outer end U1 of the outer coil 12b in the U phase are connected, and V The outer end V2 of the inner coil 12a in the phase and the outer end V1 of the outer coil 12b are connected, the outer end W2 of the inner coil 12a and the outer end W1 of the outer coil 12b in the W phase are connected, and each outer coil The inner ends X1, Y1 and Z1 of 12b are respectively connected to the neutral point, and the respective inner and outer coils are connected in parallel. As a result, the outer terminals U1, V1, W1 of the outer coils 12b or the outer terminals U2, V2, W2 of the inner coils 12a connected to the outer coils 12b through the contact points 13 of the circuit breaker are used as output terminals. A three-phase alternating current with a low voltage (for example, 200 V or 220 V) is output. At the time of this low voltage output, since a potential difference is generated between X1 and U2 in the U phase, the low voltage operation lamp 14b is turned on, and U1 and U2 are short-circuited and no potential difference is generated, so the high voltage operation lamp 14a is It goes out.

  Switching between the high voltage output shown in FIG. 4 and the low voltage output shown in FIG. 5 is performed by a voltage setting switch 21 including a cam switch having a plurality of terminal portions 21a and 21b and contact portions 21c as shown in FIG. Done. As shown in FIG. 2, the voltage setting switch 21 rotates a switching lever 22 provided on an operation panel or the like to either the high voltage setting position 22a of the circle 1 or the low voltage setting position 22b of the circle 2. When the switching is performed, the contact portion 21c is operated to be in a high voltage output state in which the inner coil 12a and the outer coil 12b are connected in series as described above, or in a low voltage output state in which both the coils 12a and 12b are connected in parallel.

  Further, the voltage setting switch 21 switches the output voltage from the high voltage to the low voltage or vice versa by rotating the switching lever 22 from the high voltage setting position 22a to the low voltage setting position 22b or vice versa. At this time, between the high voltage setting position 22a and the low voltage setting position 22b, a non-operation area 22c in which all the contact portions 21c are turned off is provided. For this reason, in the range of the angle α between the high voltage setting position 22a and the low voltage setting position 22b, the contact portion 21c is inoperative and all the coils 12a and 12b are disconnected. . The switching lever 22 is provided with urging means for urging the switching lever 22 to the high voltage setting position 22a and the low voltage setting position 22b, except when the switching lever 22 is being rotated. These are biased and held in either of the setting positions 22a and 22b.

  In the circuit breaker opening means 20 shown in the first embodiment, the contact portion 21c of the voltage setting switch 21 is connected to the control circuit 23 from the battery, and the switching lever 22 is in the non-operation area 22c. A normally open contact (S) 24 that is turned on is provided, and this normally open contact 24 and a trip coil (TC) 25 that opens each contact 13 of the circuit breaker are connected in series, and the normally open contact 24 is closed. When it is turned ON, the trip coil 25 is operated to open each contact 13 of the circuit breaker, and the output to the output terminal is interrupted.

  That is, when the switching lever 22 of the voltage setting switch 21 is set to one setting position, for example, the low voltage setting position 22b, and the output voltage is set to a low voltage, the normally open contact 24 is turned OFF and the trip coil 25 is non-activated. Each contact 13 of the circuit breaker is closed in order to be in an operating state, and the low voltage output from the synchronous generator is output to the load through each contact 13. If the switching lever 22 is erroneously operated in this state, the normally open contact 24 is turned on when the switching lever 22 moves away from the low voltage setting position 22b to the non-operation region 22c located in the middle of both setting positions. The trip coil 25 is energized to operate so as to open each contact 13 of the circuit breaker, and interrupts the low voltage output to the output terminal.

  As a result, it is possible to prevent the load operating at a low voltage from being supplied with a high voltage and to prevent the load from being damaged, and it is also possible to prevent the load and the generator from being damaged by an abnormal current at the time of voltage switching. Furthermore, since the output to the output terminal is interrupted, there is no electric shock even if the output terminal is touched. Even if the switching lever 22 rotates to either of the setting positions 22a and 22b after the circuit breaker is released, the output to the output terminal is interrupted because the circuit breaker needs to be turned on again to resume the output. Will continue. In addition, since the load stops due to the interruption of the power supply, it can be recognized that an erroneous operation has been performed.

  6 and 7 show a second embodiment of the present invention. In the following description, the same components as those shown in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.

  In the circuit breaker opening means 30 shown in this embodiment, when the switching lever 22 is rotated to the contact portion 21c to switch to either the high voltage setting position 22a of the circle 1 or the low voltage setting position 22b of the circle 2. Are provided with normally closed contacts (A, B) 31, 32 which are turned off, and these normally closed contacts 31, 32 and trip coil (TC) 25 are connected in series to a control circuit 23 from the battery.

  Therefore, when the switching lever 22 of the voltage setting switch 21 is set to one setting position, for example, the low voltage setting position 22b and the output voltage is set to a low voltage, the normally closed contact 31 on the high voltage side is ON. However, since the normally closed contact 32 on the low voltage side is turned OFF, the trip coil 25 is inactivated, and each contact 13 of the circuit breaker is closed, and the low voltage output from the synchronous generator passes through each contact 13. Output to the load. If the voltage setting switch 21 switching lever 22 is erroneously operated in this state, the normally closed contact 32 is turned ON when the switching lever 22 moves from the low voltage setting position 22b to the non-operation region 22c, and the high voltage side Since the normally closed contact 31 continues to be in the ON state, the trip coil 25 connected in series to the both normally closed contacts 31 and 32 is energized, and operates to open each contact 13 of the circuit breaker. Suspends low-voltage output to the output terminal.

  FIG. 8 shows a third embodiment of the present invention. In the circuit breaker opening means 40 shown in this embodiment, as shown in FIGS. 4 and 5, a portion of the high voltage operation lamp 14a and a low voltage operation lamp 14b are shown. Are provided with two normally open contacts (L1, L2) 41, 42 which are simultaneously energized (ON) when the high voltage operation lamp 14a or the low voltage operation lamp 14b is energized. With the normally open contacts 41 and 42 connected in parallel, the relay (RY1) 43 is connected in series with the control circuit 23, and the normally closed relay contact (RY1) 44 operated by the relay 43 and the trip coil ( TC) 25 and the control circuit 23 from the battery are connected in series.

  In this embodiment, when the inner coil 12a and the outer coil 12b of the synchronous generator 11 are connected in series or in parallel, and the high voltage operation lamp 14a or the low voltage operation lamp 14b is energized, the normally open contacts 41, 42 are used. Since either one of the relays 43 is ON, the relay 43 is energized, the normally closed relay contact 44 is turned OFF by the operation of the relay 43, the trip coil 25 is inactivated, and each contact 13 of the circuit breaker is The output from the synchronous generator is closed and output to the load through each contact 13.

  If the switching lever 22 of the voltage setting switch 21 is erroneously operated in this state, when the switching lever 22 moves from the high voltage setting position 22a or the low voltage setting position 22b to the non-operation area 22c, the contact portion 21c is not operated. As a result, the series connection or the parallel connection between the inner coil 12a and the outer coil 12b is cut off, and the high voltage operation lamp 14a and the low voltage operation lamp 14b are de-energized. At the same time, both the normally open contacts 41 and 42 are turned off. As a result, the relay 43 is deenergized, the normally closed relay contact 44 is turned on, the trip coil 25 is activated, and each contact 13 of the circuit breaker is opened to interrupt low voltage output to the output terminal. To do.

  FIG. 9 shows a fourth embodiment of the present invention. In the circuit breaker opening means 50 shown in this embodiment, the synchronous generator 11 generates power in the electric circuit of the circuit breaker opening means shown in the third embodiment. A normally open contact for power generation detection (84G) 51 that is turned ON when the power is on is provided. As shown in FIGS. 4 and 5, the power generation detection normally-open contact 51 is provided between terminals where a potential difference occurs during power generation by the synchronous generator 11, in this embodiment, the U-phase and V-phase inner coils 12 a. It is formed to be opened and closed by a voltage detection relay (84G) 52 provided between the outer ends U2 and V2.

  That is, when the switching lever 22 of the voltage setting switch 21 is at the high voltage setting position 22a or the low voltage setting position 22b and the synchronous generator 11 is generating power, a voltage difference is generated between U2 and V2, thereby causing a voltage detection relay 52. , And the power generation detection normally-open contact 51 is closed to be in an ON state. Thus, similarly to the third embodiment, when the switching lever 22 of the voltage setting switch 21 is erroneously operated, the normally closed relay contact 44 is turned on as described above, the trip coil 25 is activated, and the circuit breaker is turned on. Each contact 13 is opened.

  On the other hand, in the third embodiment, the normally closed relay contact 44 is kept ON while the synchronous generator 11 is stopped, and the trip coil 25 is in an operating state. Even if each contact 13 of the circuit breaker is to be closed, each contact 13 is released by the trip coil 25. However, in the fourth embodiment, the normally-open contact 51 for detecting power generation is OFF while the synchronous generator 11 is stopped. Since the trip coil 25 is maintained in an inoperative state, each contact 13 of the circuit breaker can be closed while the synchronous generator 11 is stopped.

  As shown in each of the above embodiments, when the voltage setting switch 21 is erroneously operated, the circuit breaker is opened (tripped) to cut off the power supply to the output terminal, and the power supply to the load is interrupted. As well as protecting the generator and the generator, it is also possible to prevent electric shock. Moreover, since it can implement only by adding a simple contact and a relay to the conventional electric circuit, the raise of manufacturing cost can also be suppressed.

  DESCRIPTION OF SYMBOLS 11 ... Synchronous generator, 12 ... Armature coil, 12a ... Inner coil, 12b ... Outer coil, 13 ... Contact of circuit breaker, 14a ... High voltage operation lamp, 14b ... Low voltage operation lamp, 20 ... Circuit breaker opening means, 21 ... Voltage setting switch, 21a, 21b ... Terminal part, 21c ... Contact part, 22 ... Switching lever, 22a ... High voltage setting position, 22b ... Low voltage setting position, 22c ... Non-operation area, 23 ... Control circuit, 24 ... Normally open contact, 25 ... Trip coil, 30 ... Circuit breaker opening means, 31, 32 ... Normally closed contact, 40 ... Circuit breaker opening means, 41, 42 ... Normally open contact, 43 ... Relay, 44 ... Normally closed relay contact, 50 ... Circuit breaker opening means, 51 ... Normally open contact for power generation detection, 52 ... Relay for voltage detection

Claims (4)

  In an engine generator having a voltage setting switch that switches a voltage output from a synchronous generator driven by an engine via a circuit breaker, the voltage setting switch selects one of a plurality of output voltages. A normally open contact that is ON when the voltage setting switch is in the intermediate position, and a normally open contact that is ON. An engine generator comprising: a circuit breaker opening means for opening the circuit breaker.   In an engine generator having a voltage setting switch that switches a voltage output from a synchronous generator driven by an engine via a circuit breaker, the voltage setting switch selects one of a plurality of output voltages. A normally closed contact that is OFF when the voltage setting switch is in the voltage installation position, and a normally closed contact that is ON. An engine generator characterized by comprising breaker opening means for opening the breaker sometimes.   In an engine generator having a voltage setting switch that switches a voltage output from a synchronous generator driven by an engine via a circuit breaker, the voltage setting switch selects one of a plurality of output voltages. A normally open contact that is turned on when the voltage setting switch is set to the voltage installation position, and the normally open contact is turned on. An engine generator comprising: a normally closed contact that is turned OFF when the contact is closed; and a breaker opening means that opens the breaker when the normally closed contact is ON.   4. The circuit breaker opening means includes a power generation detection normally-open contact for turning on the synchronous generator during power generation and making the circuit breaker opening means operable. Engine generator.

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