JPS6131136Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soundproofing device for an engine-driven generator, and more particularly to a soundproofing device for an engine-driven generator equipped with a cooling air intake/exhaust mechanism.

In recent years, electrical equipment has become indispensable in construction work. For this reason, engine generators play an important role as a power source in places where there is no commercial power source. However, engines inevitably produce large driving noises, and for this reason, there has been a strong demand for engine generators used at construction sites in urban areas to be soundproof in consideration of the work environment or local environment. On the other hand, in order to prevent the engine generator from overheating during operation, it is necessary to take in cooling air from the outside to cool the generator, engine, and engine radiator. Therefore, conventional soundproofing devices for engine generators include surrounding the main body of the engine generator with a metal plate pasted with sound-absorbing material to form a casing, and at the same time, cooling air is supplied to the inside of the casing. The structure is such that an intake port and an exhaust port are provided to take in the air, and a duct is installed in each intake flow path and exhaust flow path in a labyrinth shape to prevent noise from leaking outside through the intake port and exhaust port. For example, a soundproofing device is known in which the bottom surface of the casing has a double structure, and a maze-like duct for intake is formed using the gap in the double structure.

However, in the above conventional technology, since the duct is provided at the bottom of the casing, the casing as a soundproofing device becomes elongated by the height of the duct, which increases the size of the entire device, making it difficult to operate the engine generator in a narrow space. This had the disadvantage that it became impossible to use it. Additionally, for engine-driven generators in which the output shaft of the engine and the rotor shaft of the generator are directly connected in a straight line, the width of the engine is usually larger than the width of the generator. Therefore, when surrounding the engine generator main body with a casing serving as a soundproofing device, a large space is inevitably formed between the outer periphery of the generator and the casing. Therefore, most of the cooling air taken into the housing from the outside flows away from the generator, and the generator cannot be effectively cooled. It was hot.

The present invention was devised in view of the shortcomings of the prior art, and has the ability to reduce the size of the entire device, making it easier to handle at work sites, and at the same time providing soundproofing effects that can effectively cool generators, etc. To provide excellent engine generator soundproofing equipment,
That purpose.

In the present invention, folded ducts for intake are provided on both sides of the generator in a soundproof casing, inscribed in the casing, and an intake port is provided at the inflow side end of the folded duct to communicate the folded duct with outside air. Along with drilling,
An internal discharge port is provided at the discharge end of the folded duct close to the air intake port of the generator, and
The above objective is achieved by extending a top plate in the width direction from the upper part of the internal discharge port to form an internal duct for cooling the outer periphery of the generator.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a partially cutaway perspective view showing an engine generator equipped with a soundproofing device according to the present invention. In the figure, 1 is an engine generator main body, and this engine generator main body 1 includes an engine 2 arranged so that its output shaft is in the longitudinal direction (RS direction in Fig. 1), and this engine 2. The generator 3 is rotatably driven by having a rotor shaft linearly directly connected to the output shaft of the generator 3. This engine generator body 1
is surrounded on all four sides by a casing 4 serving as a soundproofing device. This housing 4 is formed from a metal plate 6 to which a sound absorbing material 5 is adhered on the inner surface in order to enhance the soundproofing effect. The interior of the housing 4 is divided into two by a partition plate 7 extending vertically in front of the engine 2 into an exhaust chamber 8 on the front side of the partition plate 7 and an engine room 9 on the rear side. . A radiator 10 for cooling the engine is mounted on the engine room 9 side of the partition plate 7. On the other hand, the exhaust chamber 8 side of the partition plate 7 is equipped with a muffler 12 for muffling that is connected to the exhaust pipe 11 of the engine 2.
This muffler 12 is designed to be cooled by exhaust gas from a radiator 10, which will be described later.

An air purifier 13 for removing dust and the like from the combustion air is provided above the engine 2, and a radiator cooling fan 14 is provided in the front of the engine 2. The radiator cooling fan 14 is rotated by the engine 2 and supplies cooling air to the radiator 10. And the radiator 1
After the air that has cooled the 0 is blown toward the exhaust chamber 8, it is released into the outside air through exhaust ports 15 and 16 provided at the upper surface and the lower end of the front surface of the housing 4. (See arrows G and H in Figure 1).

On the other hand, the generator 3 has an air intake port 1 at the rear end.
7, and a fan 18 fixed to the rotor shaft is provided at the front part. Therefore, when the generator 3 directly connected to the engine 2 is rotated by the drive of the engine 2, the fan 18 is rotated.
As a result, cooling air flows into the generator 3 from the air intake port 17 (first
(See arrow C in the figure). Then, the air that has cooled the generator 3 through the inside of the generator 3 is blown outside from the fan 18, and together with the air that has cooled the outside of the generator 3 by the function of the internal duct 26, which will be described later, Due to the action of the radiator cooling fan 14, the air continues to flow along the outer periphery of the engine 2 to cool the engine 2 (see arrow E in FIG. 1).

In this way, air for cooling the engine 2, generator 3, engine radiator 10, etc. is supplied to the folded ducts 19, 19 as maze-shaped intake ducts, which will be described later.
It is adapted to be introduced into the engine room 9 via an internal duct 26.

At the bottom of the housing 4 on the engine room 9 side, there is a bottom plate 20 having a U-shaped groove in the center and horizontally bent flange portions 20A, 20A at the upper end. It extends from the back surface 4A to the partition plate 7. The engine generator main body 1 is
It is placed on the collar portions 20A, 20A of the bottom plate 20 so as to straddle the concave portion of the bottom plate 20. In addition, a vibration-proofing rubber 50 is interposed between the engine generator main body 1 and the bottom plate 20, so that vibrations during operation of the engine generator main body 1 are not transmitted to the soundproof casing 4. It's becoming like that. Flange portions 20 of this bottom plate 20 on both sides of the generator 3
A and 20A are equipped with folded ducts 19 and 19 that are formed symmetrically. The folded ducts 19, 19 are inscribed in the rear end corner of the housing 4 and are arranged in the axial direction (front-back direction) of the generator 3. The folded ducts 19, 19 are connected to the housing member 2.
1, 21, the housing 4, and the bottom plate 20, and are shielded from the outside by the housing 4 and the bottom plate 20, and
The interior is inclined obliquely upward from the joint between the bottom plate 20 and the rear surface 4A of the casing 4, and further divides the inside of the casing members 21, 21 into two vertically in the longitudinal direction (horizontal direction). Folded plates 22, 22 are provided that extend to near the front walls of the housing members 21, 21. The upper side of this folding plate 22 forms the upstream (intake) side of the folding duct 19, and after folding at the tip of the folding plate 22, the lower side of the folding plate 22 forms the downstream (discharge) side. The intake flow path is shaped like a labyrinth. That is, the rear surface 4 of the casing 4 which is the rear end of the folded duct 19
A is provided with intake ports 23, 23, .
At the rear end of A, 21A, an air intake port 1 of the generator 3 is located at a position below the inclined portion 22A of the folding plate 22.
Approximately triangular internal discharge ports 24, 24 adjacent to 7
(one of which is not shown) is drilled. Therefore, the cooling air flowing in from the intake ports 23, 23, . After passing through the upper side of the folding plate 22B and folding downward into a U-shape at the tips of the folding plates 22, 22, passing through the lower side of the horizontal portions 22B and 22B, the inclined portion 2
The liquid is discharged from the internal discharge ports 24, 24 while descending along lines 2A, 22A (see arrow B in FIG. 1). And the internal duct 26
A part of the cooling air discharged into the generator 3 flows into the generator 3 through an air intake port 17 of the generator 3 (see arrow C in FIG. 1).

On the other hand, between the folded ducts 19, 19,
A housing member 21, which covers the upper part of the outer periphery of the generator 3,
A top plate 25 fixed to the upper end of 21 extends, and an internal duct 26 is formed below the top plate 25. Therefore, through this internal duct 26, a part of the cooling air taken into the engine room 9 from the internal discharge ports 24, 24 of the folded ducts 19, 19 flows along the outer periphery of the generator 3, The area around the generator 3 is cooled (see arrow D in FIG. 1). The cooling air that cooled the generator 3 from inside and outside is
As described above, due to the action of the radiator cooling fan 14, the air continues to flow along the outer periphery of the engine 2, cooling the area around the engine 2.

Turning duct 19, 1 configured as above
Similar to the case 4 described above, sound absorbing material 5 is attached to the inside and outside of the housing 9 and the internal duct 26 . Also,
At the top of the folded ducts 19, 19, attached devices such as a battery 27 for starting the engine are provided.

In the above embodiment, the case where the top plate 25 forming the internal duct covers the entire outer circumference of the generator 3 is shown, but the present invention is not limited to this in any way, and in order to save members. As shown in FIG. 2, the top plate 25A is about to pass near the upper end of the generator 3 (a vibration-proof rubber 28 is interposed between the top plate 25A and the generator 3), and the outer periphery of the generator 3 You may configure so that a part of it may be exposed from the internal duct 26A.

As described above, according to the present invention, the cooling air intake flow path is provided on both sides of the generator inside the soundproof casing, so the height of the casing is not increased, and the entire device is Since it can be miniaturized, it is extremely easy to install, move, etc. at a work site.
In addition, the folded duct allows the intake flow path to the engine room to be shaped like a labyrinth with a relatively simple configuration, and the internal duct makes it possible to effectively cool the generator, etc. Since the internal duct has the function of creating a labyrinth in the intake flow path as seen from the engine (noise source), it is possible to exhibit an excellent effect of further increasing the soundproofing effect.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an example of a soundproofing device for an engine-driven generator according to the present invention, and FIG.
This figure is a simplified front view showing another embodiment of the internal duct portion in FIG. 1. 1... Engine generator body, 3... Generator, 4
...Housing as a soundproofing device, 5...Sound absorbing material, 17
... Generator air intake, 19 ... Turning duct, 23 ... Intake port, 24 ... Internal discharge port, 25
...Top plate, 26...Internal duct.

Claims (1)

[Scope of utility model registration request] In a soundproofing device for an engine-driven generator, in which the main body of the engine-driven generator is surrounded by a metal plate or the like to which a sound-absorbing material is attached, the outside air is inscribed in the casing on both sides of the generator inside the casing. A folded duct for intake is provided, an intake port is provided at the end of the folded duct on the outside air inflow side for communicating the folded duct with the outside air, and the generator is connected to the discharge side of the folded duct. An internal discharge port is bored close to the air intake port of the generator, and a top plate is extended in the upper width direction of the upper part of the internal discharge port to form an internal duct for cooling the outer periphery of the generator. Soundproofing equipment for engine-driven generators.