JPH083147Y2 - Soundproof engine generator protector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a protection device for a soundproof engine generator,
In particular, the present invention relates to a soundproof engine generator protection device capable of preventing an abnormal temperature rise of a generator or the like when the opening / closing portion of the soundproof case is opened.

<Prior Art> Generally, a soundproof case of a soundproof type enshin generator is provided with an opening / closing part for, for example, checking or servicing an engine or checking or servicing electric circuit parts. These opening and closing parts are formed in a size that is considerably required for inspection work and maintenance work.

Further, in the soundproof engine generator, in order to cool the inside of the soundproof case, a cooling fan is provided in the soundproof case, and the air sucked from the outside is caused to flow along a predetermined path in the soundproof case to generate an engine, power generation. It is configured to cool the machine and the like and then discharge it to the outside. As a matter of course, the path of the cooling air inside the soundproof case is set on the assumption that the opening / closing section is closed.

<Problems to be solved by the invention> For this reason, for example, when the opening / closing part provided near the cooling fan is opened, the entire amount of air sucked by the cooling fan is sucked or discharged through the opening / closing part. Therefore, the flow of the cooling air is almost eliminated in the part farther from the opening / closing part in the soundproof case, and the temperature of the equipment arranged in that part may be abnormally increased.

For example, as shown in FIGS. 1 and 2, a radiator 3, a radiator fan 4, an engine 5, a generator 6, and a controller 7 are arranged in this order from one end to the other end of the soundproof case 2.
In order to check the engine 5 in the soundproof type engine generator 1 in which the opening / closing parts 8 and 10 are provided on the lateral side of the soundproof case 2, that is, on the lateral side of the engine 5 and the lateral side of the generator 6, Alternatively, when the engine 5 is operated by opening the door 9 that opens and closes the opening / closing part (engine inspection port) 8 on the side for maintenance, the radiator fan 4 sucks in from the soundproof case 2 (or inside the soundproof case 2). Almost all of the air that is blown out is sucked in (or blows through the opening / closing portion 8) from the opening / closing portion 8, and the generator 6 and the controller 7 are hardly exposed to the cooling air. Further, since the generator 6 is driven by the engine 5, there is a risk that the temperature will rise abnormally due to heat generated by power generation.

Also, when the control panel 11 that covers the opening / closing part (generator inspection port) 10 on the side of the generator 6 is opened for inspection or maintenance of the generator 6 or the controller 7, the opening / closing part is also opened.
10 functions as an inlet (or an outlet) for the cooling air, making it difficult for the cooling air to hit the generator 6 and the controller 7, and there is a risk that the generator 6 will have an abnormal temperature rise due to insufficient cooling.

The present invention has been made in consideration of the above circumstances, and protects a soundproof engine generator capable of preventing an abnormal temperature rise of the generator etc. when the opening / closing part of the soundproof case is opened. The purpose is to provide a device.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the soundproof type engine / generator protection device according to the present invention has a soundproof case (2) as shown in FIGS. 1 and 2, for example. Inside, a radiator (3), a radiator fan (4), an engine (5) and a generator (6) are arranged in this order from one end to the other end, and a soundproof case (2) is externally provided by the radiator fan (4).
In a soundproof type engine generator for cooling the generator (6), the engine (5) and the radiator (3) by flowing the cooling air sucked into the soundproof case (2) along a predetermined path, a soundproof case Opening / closing parts (8) and (10) are provided in the part of (2) facing the engine (5) and the part of facing the generator (6), and the opening / closing parts (8) and (10) are provided with respective opening / closing parts ( 8) ・ (10) lids (9) ・ (11) for opening / closing are arranged, and switches (12) ・ (13) that operate in conjunction with opening / closing operations of the lids (9) ・ (11) This switch (12) / (13) is a switch for switching the power generation / stop of the generator (6). When the lids (9) / (11) are opened, the switches (12) / (13) While stopping the power generation of the generator (6), closing the lids (9) and (11) switches (1
It is characterized in that 2) and (13) are configured to cause the generator (6) to generate electricity.

<Operation> In the soundproof engine generator as described above, when the lids (9) and (11) are closed, the radiator fan (4) sucks the sound into the soundproof case (2) from the outside, and the soundproof case ( The generator (6), the engine (5) and the like are sequentially cooled by the cooling air that flows through the inside of 2) along a predetermined path. For example, when the lid (9) is opened, the opening / closing part (8) The position is relative to the radiator fan (4) rather than the position of the cooling air intake port, which is located at a position deviated to the generator (6) side from the opening / closing part (8) because it is necessary to cool the generator (6). The radiator fan (4) sucks cooling air into the soundproof case (2) from the outside mainly through the opening / closing part (8) because the radiator fan (4) is located closer to the soundproof case (2).

Therefore, the cooling air sucked from the opening / closing part (8) cools the radiator (3) on the downstream side but does not contribute to the cooling of the generator (6).

As a result, if the power generation operation of the generator is continued with the lid (9) open for a long time, the heat generated by the power generation causes the generator (6) to abnormally rise in temperature, which causes a failure.

On the other hand, when the lid (11) is opened, the radiator fan (4)
Sucks cooling air into the soundproof case (2) not only from the original cooling air intake port but also from the opening / closing part (10). Here, the opening / closing part (1
Since 0) is provided in the portion facing the generator (6), the cooling air flowing from here into the soundproof case (2) is
Instead of hitting the generator (6), head for the engine (5) as it is.

Therefore, when the lid body (11) is open, the cooling air volume of the generator (6) is insufficient. As a result, even when the power generation operation of the generator is continued with the lid (11) open for a long time, the same problem as described above occurs.

However, in the present invention, when the lids (9) and (11) are opened, the switches (12) and (13) interlocking with the opening and closing operations of the lids (9) and (11) are provided with the generator in any case. Since the power generation of (6) is automatically stopped, the generator (6) does not rise abnormally even if the cooling air volume is insufficient.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is an electric circuit diagram of a protection device for a soundproof engine generator according to an embodiment of the present invention, FIG. 2 is a side view of the soundproof engine generator, and FIG. 3 is a transverse plane thereof. FIG. 4 is a plan view of the engine speed control mechanism.

In the soundproof case 2 of this soundproof type engine generator 1,
A radiator 3, a radiator fan 4, an engine 5, a generator 6 and a controller 7 are arranged side by side from one end to the other end, and are arranged laterally of the soundproof case 2, that is, the engine 5.
Opening / closing sections 8 and 10 are provided on the side of the generator and the side of the generator 6, respectively.

The opening / closing part 8 on the side of the engine 5 has a door 9 whose upper edge is swingably supported above the soundproof case 2 via a hinge 14.
The opening / closing part 10 on the side of the generator 6 is opened / closed by a control panel 11 which is swingably supported on the rear part of the soundproof case 2 via a hinge 15.

Each switch operated by opening / closing the door 9 or the control panel 11 on the edge frame 8a / 10a of each opening / closing part 8/10.
12 and 13 are provided. These switches 12 and 13 are connected in series to the exciting circuit 6a of the generator 6 as shown in FIG.
The excitation circuit 6a is opened when the door 9 or the control panel 11 is opened, and the excitation circuit 6a is closed when the door 9 or the control panel 11 is closed.

Further, as shown in FIG. 3, the engine 5 is provided with a hydraulic pressure sensor 16 that outputs a hydraulic pressure decrease signal when the pressure of the lubricating oil circulated therein is equal to or lower than a predetermined value.
The cooling air inlet 6b (or the cooling air outlet 6c) of the generator 6 is provided with a temperature sensor 17 that outputs an abnormal temperature rising signal when the cooling air temperature exceeds a predetermined value, and as shown in FIG. In addition, an emergency stop unit 18 for stopping the engine 5 when the oil pressure decrease signal of the oil pressure sensor 16 or the abnormal temperature increase signal of the temperature sensor 17 is input is provided.

The emergency stop unit 18 does not operate from the start of the engine 5 until the generated current reaches the predetermined value, and after the generated current reaches the predetermined value, the hydraulic pressure decrease signal of the hydraulic sensor 16 or the abnormal temperature rise of the temperature sensor 17 occurs. When a signal is input, a stop operation command is output to the stop solenoid 21 of the engine stop control mechanism 20.

The stop solenoid 21 is energized when the engine 5 is operating normally, and as shown by the phantom line in FIG.
When the gear shift lever 23 is positioned at the operating position against the return spring 22 and a stop operation command is input, the energization is stopped, and as shown by the solid line in FIG. Is designed to be displaced to the stop position. The return spring 22 may be mounted on the speed change lever 23 as shown by the dotted line in FIG. 4 as in the conventional case, but here, it is connected to the output end 21a of the stop solenoid 21 via the push-pull link 24. It is attached to the intermediate lever 25 that is mounted. Due to this, the set length of the return spring 22 is changed for rotation adjustment, and the connecting contacts of the speed change lever 23 and the engine stop control mechanism 20 are twisted, and the stop solenoid
The load of 21 is prevented from changing, and the operation of the engine stop control mechanism 20 is prevented from varying. Further, as a result, both the output of the stop solenoid 21 and the elastic restoring force of the return spring 22 that oppose each other act on the intermediate lever 25, and the intermediate lever 25 shifts to the shift lever 23.
The resistance at the contact point of the engine stop control mechanism 20 up to is significantly reduced, the load applied to the stop solenoid 21 is reduced, and the capacity of the stop solenoid 21 is reduced.
The power consumption is saved.

As shown in FIG. 2, the air cleaner 26 of the engine 5 is arranged on the side of the radiator 3 in the soundproof case 2 facing the opening / closing part 8 to facilitate maintenance, and is connected to the air cleaner 26. The fresh air introduction pipe 27 is guided to the bottom of the soundproof case 2 along the upper edge of the opening / closing part 8 and the column 28 between the opening / closing parts 8 and 10, and is slanted at the bottom of the soundproof case 2. It opens downward. As a result, the cool air at the bottom of the soundproof case 2 can be introduced into the air cleaner 26, and the fresh air introduction pipe 27 does not interfere with the inspection and maintenance of each device in the soundproof case 2 from both opening / closing sections 8 and 10. Further, the intake air can be attenuated by lengthening the fresh air introduction pipe 27.

Now, in this soundproof type engine generator protection device, when the lid 9 or the control panel 11 is opened,
Since the exciting circuit 6a of the generator 6 is opened, the power generation operation of the generator 6 is stopped, so that the heat generation of the generator 6 is stopped.
As a result, the temperature of the generator 6 is prevented from rising abnormally.

In addition, since the stop of the power generation operation of the generator 6 is executed regardless of the operation of the engine 5 as described above, no trouble occurs in the inspection and maintenance of the engine 5, and
There is also no risk of electric shock during inspection and maintenance.

Further, when the temperature sensor 17 is arranged at the cooling air inlet or outlet of the generator 6 and the engine 5 is configured to be stopped when the temperature sensor 17 detects a high temperature equal to or higher than a predetermined temperature, the engine 5 is temporarily stopped. Even if the temperature of the engine 5 is lower than a predetermined value, the restart of the engine 5 is impossible due to the response delay of the temperature sensor 17 unless the fixed time required for normal startup has passed after the engine was stopped. But
Here, since the emergency stop unit 18 is configured not to operate for a certain period of time from the start of starting the engine 5, it is possible to immediately restart the engine 5 even after the engine 5 has been stopped once. Can be better. After the restart, when the temperature sensor 17 still detects a high temperature after the elapse of a certain time required for normal startup, the emergency stop unit 18 operates and the engine 5 is stopped.

<Effect of the Invention> According to the present invention described above, the lid for opening and closing the opening / closing portion of the soundproof case is opened, and when there is a possibility that the cooling air volume of the generator is insufficient, the lid opening / closing operation is linked. Since the switch that operates in this way automatically stops the power generation of the generator, for example, even if the lid is opened for inspection and maintenance while the engine is operating, the generator will not abnormally heat up. Therefore, the generator can be effectively protected from such an abnormal temperature rise.

Further, since the power generation stop of the generator is executed regardless of the operation of the engine, the inspection can be performed and the maintenance can be performed while the engine is operating. Therefore, there is an advantage that inspection and maintenance can be performed in actual use.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a soundproof engine generator protector according to an embodiment of the present invention, FIG. 2 is a side view of the soundproof engine generator, FIG. 3 is a cross-sectional plan view thereof, and FIG. The figure is a plan view of the engine speed control mechanism. 1 ... Soundproof engine generator, 2 ... Soundproof case, 6 ...
… Generator, 6a… Excitation circuit, 8… Opening / closing part, 9… Door,
10 …… opening / closing part, 11 …… control panel, 12 …… switch, 13 …… switch.

Claims (1)

[Scope of utility model registration request] 1. A radiator fan (4) in which a radiator (3), a radiator fan (4), an engine (5) and a generator (6) are arranged in this order from one end to the other end in a soundproof case (2). Soundproof case from outside by (2)
In a soundproof type engine generator for cooling the generator (6), the engine (5) and the radiator (3) by flowing the cooling air sucked into the soundproof case (2) along a predetermined path, the soundproof case The opening / closing parts (8) and (8) are respectively provided in the part facing the engine (5) and the part facing the generator (6) in (2).
(10) is provided, and lids (9) and (11) for opening and closing the opening and closing parts (8) and (10) are arranged in the opening and closing parts (8) and (10), and the lids (9) and ( The switches (12) and (13) that operate in tandem with the opening and closing operation of 11) are arranged, and these switches (12) and (13) are switches that switch between power generation and power generation stoppage of the generator (6). Body (9) ・ (11)
When the switches (12) and (13) are opened, the power generation of the generator (6) is stopped, while when the lids (9) and (11) are closed, the switches (12) and (13) are switched to the generator (6). An engine generator protection device, characterized in that it is configured to generate electric power.