JPS6330220Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a soundproof cooling structure for an engine-driven generator in which an engine and a generator driven by the engine are housed in a soundproof casing. The present invention relates to a soundproof cooling structure for an engine-driven generator that can efficiently cool the inside of the body.

"Prior Art" This type of soundproof engine-driven generator, which is mainly used in engine welding machines, houses the generator and the engine for driving it in a soundproof housing.
In order to prevent the temperature inside the soundproof case from rising, the suction power from the radiator fan driven by the engine and the cooling fan built into the generator are used to draw air from the intake port on one side of the soundproof case. Outside air is sucked in, passed through the housing, and then exhausted to the outside from the outlet on the other side, thereby performing cooling with the outside air.

``Problem to be solved by the invention'' In this conventional engine-driven generator, the generator is cooled by outside air taken in from the intake port on one side of the soundproof case, and the air whose temperature has risen due to the generator is cooled. It is discharged as it is into the soundproof case, and inside the soundproof case,
In particular, there was a drawback that the engine oil pan could not be cooled efficiently. In addition, if the air that has been heated by cooling the generator is circulated as it is inside the soundproof enclosure, the high temperature air will reduce the substantial amount of air required for the supplied fuel. This impairs the combustion efficiency of the engine, leading to a decrease in engine output, and the control devices and field controllers equipped with semiconductors for controlling the field winding of the generator are prone to failure, shortening their lifespan. The present invention has been made with the aim of solving these problems.

"Means for Solving the Problems" As a means for solving the problems described above, the present invention includes an engine, a generator driven by the engine, and a radiator of the engine that are housed in a soundproof casing. An engine equipped with a built-in fan of a generator and a radiator fan rotated by the engine for sucking outside air into the soundproof housing from an intake port on one side and exhausting hot air to the outside from an exhaust port on the other side of the soundproof housing. In the soundproof cooling structure of the drive generator, the generator is placed in the front part of the soundproof case, and the engine is placed in the center part.
A radiator that is cooled by a radiator fan is installed at the rear and an exhaust chamber that has an opening to receive hot air from the radiator and an opening to exhaust the air from the top to the outside. An intake port for taking in outside air is provided at the front bottom of the soundproof casing located below the opening, an intake duct is provided at the bottom of the soundproof casing behind the intake port, and the air introduction side of the intake duct is connected to the outside. It is formed in a bifurcated shape with a communicating part and a part communicating with an outlet for discharging cooling air of the generator, and the outlet of the intake duct is opened toward the lower part of the engine, and the upper part of the generator in the soundproof enclosure is formed. is characterized by a soundproof cooling structure for an engine-driven generator, which is equipped with an intake port that communicates between the outside and the inside of another soundproof enclosure, and a box to which control equipment such as the generator and output terminals are attached. It is something to do.

"Operation" According to the soundproof cooling structure for an engine-driven generator according to the present invention having the above-described structure, the outside air taken in through the intake port provided at the front bottom of the soundproof casing cools the inside of the generator, and cools the inside of the generator. The air exhausted from
After the air temperature is lowered by mixing with the outside air taken in separately from the intake duct installed at the rear bottom of the intake port, the lower part of the engine is cooled, and the air intake port of the box where the control equipment and output terminals are separately housed is cooled. Outside air is introduced into the soundproof case through the air, and cool air is efficiently supplied into the soundproof case.

"Embodiment" An embodiment of the soundproof cooling structure for an engine-driven generator according to the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view of a soundproof engine-driven generator applied to a welding machine, and FIG. 2 is a front view as viewed from arrow A in FIG. 1. In the figure, 1 is a soundproof case, wheels 2,
2 and is configured to be movable. Soundproof enclosure 1
Inside, there is an engine 3 in the center, a generator 4 driven by the engine 3 in the front, an air cleaner 5 for the engine 3, and an oil tank for supplying fuel to the engine 3, and further in the rear. A radiator 8 that is cooled by a radiator fan 7 is disposed at each side, and an exhaust chamber 11 is provided at the rearmost portion. 10
27 is a muffler having an exhaust pipe 9; 27 is an intake port provided at the front bottom portion of the soundproof housing 1 located below the opening 29 of the generator 4; and 28 is a built-in fan of the generator 4. Reference numeral 29 denotes the above-mentioned opening provided on the side edge of the tip end of the generator 4, and numeral 31 denotes a discharge port similarly formed by opening downward at the side edge of the rear end. Intake port 27
The more inhaled outside air flows into the generator 4 through the opening 29 of the generator due to the suction force of the built-in fan 28, cools the inside of the generator 4, and then is directed from the outlet 31 to the bifurcated air intake duct 32. be discharged. A protective net for removing dust is attached to the opening 29 and the discharge port 31 provided in the generator 4. Reference numeral 30 denotes an intake port provided at the rear bottom of the intake port 27, that is, on the side of the lower end of the intake duct 32. The discharge port 33 of the intake duct 32 is opened toward the lower part of the engine 3, that is, toward the oil pan. The inside of the generator 4 is cooled by the outside air sucked in from the intake port 27 at the front bottom of the soundproof housing 1, and the temperature of the air discharged toward the intake duct 32 has increased somewhat, but the temperature of the air that is discharged from the intake port 3
The temperature of the air is lowered by combining it with outside air that has been separately drawn in from 0, and the air is discharged from the discharge port 33 toward the oil pan at the bottom of the engine 3 by the suction force of the radiator fan 7. Although the oil pan has a high temperature (80 to 100° C.), it is efficiently cooled by the cooling air mixed by the intake duct 32 as described above. The exhaust chamber 11 is arranged behind the radiator 8. 10 is a muffler,
The lower part of the exhaust chamber 11 is separated by a partition wall and housed in a separate room.

Above the generator 4, which is one side of the soundproof housing 1, an operation panel box 13 and output terminal boxes 14, 14', which are the boxes made of recessed parts, are provided. The operation panel box 13 includes a field controller 15 located inside the soundproof housing 1, and a knob 16 is attached to the outer panel surface. An air intake port 17 that communicates with the inside of the soundproof housing 1 is formed in the upper part of the inside of the operation panel box 13, and the outside air taken in through the air intake port 17 is
The field controller 1 is activated by the attraction force of the radiator fan 7.
5 flows into the soundproof casing 1 while being cooled. On the other hand, the output terminal boxes 14 and 14', which are concave portions provided below the operation panel box 13, have output terminals 19 on their bottom surfaces, that is, on the downwardly inclined terminal mounting surfaces. Wiring 20 from the welding wire 20 and a welding cable 21 that supplies power to the welding rod and the welding base material are connected. Note that the output terminal box 14 is for DC,
4' is sectioned for alternating current. Output terminal box 14,
An intake port 22 communicating with the inside of the soundproof housing 1 is bored in the upper part of the inside of the box 14', and a door body 18 for preventing rainwater from flowing in covers the output terminal boxes 14, 14' on the front side.
is attached so that it can be opened and closed freely. The door body 18 has a gap 26 between it and the bottom surface of the output terminal boxes 14, 14' to which the welding cable 21 is drawn and closed. Since the air flows into the soundproof case 1 through the opening 22, even if the output terminal boxes 14, 14' are closed by the door 18, outside air can be sucked into the soundproof case 1 through the intake port 22. It has a unique structure. Reference numeral 23 denotes the generator 4 which is suspended facing the intake port 22 at the upper inner part of the output terminal box 14, 14'.
A control device including a semiconductor for controlling the field winding of the substrate 24 to which the control device 23 is attached.
is supported by stays 25, 25. The outside air flowing in through the air intake port 22 from the gap 26 of the door body 18 surrounds the board 24 and directly cools it, so that the control equipment 23 is controlled by the airflow near the engine 3 inside the soundproof case 1, whose temperature has increased. It is designed not to heat up. Output terminal box 14, 14'
is formed as a concave portion inside the soundproof housing 1 and is covered by a door body 18 that blocks the inflow of rainwater. Since the bottom of the output terminal boxes 14, 14', that is, the mounting surface of the output terminal 19, is sloped downward, the output terminal box 14,1
It is possible to prevent rainwater from entering 4', that is, the output terminal 19 and the intake port 22 at the upper part of the interior. The outside air sucked in from the gap 26 below the door body 18 covering the output terminal boxes 14, 14' is passed through the radiator fan 7.
The control equipment 23 is cooled by the suction force of
Air is taken into the suction port 5' of the air cleaner 5 through an intake cylinder 35 attached to the periphery of the engine 3, and is discharged to the outside through the muffler and the exhaust pipe 9 from the engine 3.

An air intake port 27 on one side of the soundproof case 1, that is, the front bottom of the soundproof case 1, and an air intake port 3 on the rear bottom of the air intake port 27.
0 and the air intake port 1 at the upper part of the inner part of the operation panel box 13
7 and the output terminal boxes 14, 14' through the gaps 26 of the door bodies 18, and the outside air sucked in from the intake ports 22, respectively, becomes a plurality of air currents by the suction force of the radiator fan 7, and cools the inside of the soundproof housing 1. Each airflow reaches the radiator 8 and is introduced into the exhaust chamber 11 from the rear opening of the radiator 8. The exhaust chamber 11 is open at the top and has a muffler 1 in the center.
0 exhaust pipe 9 is installed upright. Exhaust gas from the muffler 10 is exhausted to the outside through the exhaust pipe 9. On the other hand, the hot air in the exhaust chamber 11 is exhausted to the outside through the upper opening. At this time, a part of the exhaust gas into the exhaust chamber 11 comes into contact with the inner surface of the rear wall of the soundproof housing 1 and descends, flows into the interior of the muffler housing chamber through a hole drilled in the upper surface of the housing chamber of the muffler 10, and flows into the muffler housing chamber. 10
While being cooled, it is discharged to the outside through an armored window 12 provided on the rear wall of the storage chamber. Since the high-temperature muffler 10 is isolated from the rest of the soundproof case 1 and housed in a separate room, the radiant heat from the muffler 10 is transferred to the soundproof case 1.
It cannot be transmitted internally. Note that 36 is a sound absorbing material attached to the front and rear of the housing 1.

[Effect of idea]

As mentioned above, the present invention includes a
An intake port 27 is provided for sucking outside air to cool the generator 4 in the soundproof housing, and a rear bottom portion of the intake port is provided for separately sucking outside air to be mixed with the air discharged from the generator. An intake duct is provided, and the mixed air is supplied as cooling air for the engine, especially the lower part of the engine.In other words, even if the temperature of the air that cools the generator and is discharged is slightly increased, it is separately supplied in the intake duct. The temperature decreases when mixed with the intake air, and in order to cool the engine with the lowered temperature air, it is necessary not only to prevent the generator from overheating, but also to effectively cool the inside of the engine and other parts. It will be done. In addition, the intake of outside air is performed not only through the intake port 27 at the front bottom of the housing 1 and the intake port 30 at the rear bottom of the housing 1, but also from the intake port provided in the box to which the control equipment is attached. Since cold air is efficiently supplied into the soundproof housing 1, there is no abnormal temperature rise in the engine, etc., the combustion efficiency of the engine is particularly good, and there is no decrease in engine output as in the conventional case. Furthermore, since control equipment such as semiconductors and field controllers are directly cooled by the outside air, they can have a long life.

As described above, in the soundproof cooling structure of the engine-driven generator according to the present invention, the soundproof casing has a sealed structure, and cold air near the ground surface can be sucked in from the intake port at the bottom of the soundproof casing. The interior of the soundproof housing can be efficiently cooled, noise is absorbed by the ground, and noise pollution can be prevented, smooth operation is possible, and the soundproof cooling structure has excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of a soundproof cooling structure for an engine-driven generator according to the present invention, and FIG. 1 is a side sectional view;
FIG. 2 is a front view as viewed from arrow A in FIG. 1. 1... Soundproof case, 3... Engine, 4... Generator, 5... Air cleaner, 6... Oil tank, 7...
...Radiator fan, 8...Radiator, 9...
Exhaust pipe, 10...muffler, 11...exhaust chamber, 1
3...Operation panel box, 14, 14'...Output terminal box, 15...Field controller, 23...Control equipment, 2
6... Gap, 17, 22, 27... Intake port, 28
...Built-in fan, 29...Opening, 30...Intake port, 31...Exhaust port, 32...Intake duct, 33
...Discharge port.

Claims (1)

[Scope of utility model registration request] The engine, the generator driven by the engine, and the radiator of the engine are housed in a soundproof case, and outside air is drawn into the soundproof case from an intake port on one side of the soundproof case, and the other side of the soundproof case is In a soundproof cooling structure for an engine-driven generator, the generator is equipped with a built-in fan and a radiator fan rotated by the engine for discharging hot air to the outside from the exhaust port of the generator. The engine is placed at the rear, the radiator is cooled by a radiator fan at the rear, and at the rear there is an exhaust chamber with an opening that receives hot air from the radiator and an opening that exhausts the air from the top to the outside to cool the generator. An intake port for taking in outside air is provided at the front bottom of the soundproof housing located below the air intake opening.
An intake duct is provided at the bottom of the soundproof casing behind the intake port, and an air intake side of the intake duct is formed into a bifurcated shape with a part communicating with the outside and a part communicating with an outlet for discharging cooling air of the generator. and the discharge port of the intake duct is opened toward the bottom of the engine, and above the generator in the soundproof housing is provided with an intake port that communicates between the outside and the inside of the other soundproof housing, and the generator A soundproof cooling structure for an engine-driven generator, characterized by comprising a box to which control equipment and output terminals such as the above are attached.