JP2003090223A - Sound-proof generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generator with a cooling air intake in a side plate of a generator casing for cooling an engine and the generator, offering compact construction for securing the capacity of muffler for sound deadening in a limited space, suppressing the exhaustion of white smoke, and reducing noises. SOLUTION: The generator 1 having the cooling air intake 6 provided in the side plate of the generator casing for cooling the engine 11 and the generator 12 and a cooling air exhaust port 30 provided above a radiator 17 on its cooling air supply side comprises one or more small mufflers to be connected to the engine 11, formed to be elliptical or oval in a side view.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing noise generated by a power generator. More specifically, the present invention relates to a noise reduction structure in a package type power generator.

[0002]

2. Description of the Related Art A soundproof type generator is used for supplying electric power at a construction site or the like. The soundproof type generator is transported to the site and generates electricity. Conventionally,
As a soundproof technology for a soundproof type generator, Japanese Patent Application Laid-Open No. 2000-282
The one shown in Japanese Patent No. 885 is known. In this structure, a shielding plate or the like having a sound absorbing material is arranged in the structure on the exhaust side.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the technique disclosed in Japanese Patent No. 885, it is difficult to make the entire length of the soundproof type generator compact, and it is difficult to improve the soundproof effect on the intake side.
As described above, the soundproof type generator is transported to the site and placed at the site. For this reason, when the total length is large, the efficiency may be reduced in terms of transportability and installability.

[0004]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, according to the first aspect of the present invention, the power generator is provided with a cooling air intake for cooling the engine and the generator on the side plate of the power generator housing, and a cooling air exhaust above the cooling air supply side of the radiator. In addition, one or more small mufflers connected to the engine are provided.

In the second aspect, the muffler is elliptical or oval in side view.

According to a third aspect of the present invention, the muffler is arranged in front of the radiator on the side where the cooling air is discharged, and the radiator side of the muffler is tilted downward and fixed.

According to a fourth aspect of the present invention, the muffler is disposed above the cooling air discharge side of the radiator, and the radiator side of the muffler is tilted upward and fixed.

According to a fifth aspect of the present invention, the muffler is arranged on the front side of the radiator on the cooling air discharge side and above the cooling air discharge side, and the muffler provided on the front side of the radiator on the cooling air discharge side is:
The radiator side of the muffler is tilted downward and fixed, and the muffler provided above the cooling air discharge side of the radiator is fixed by tilting the radiator side of the muffler upward. It is fixed by tilting the radiator side upward.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of the power generator, FIG. 2 is a side view showing the internal structure of the power generator, FIG. 3 is a rear view of the same, FIG. 4 is a front view of the structure of an opening / closing door, and FIG. FIG. 6, FIG. 6 is a view showing the assembly structure of the opening / closing door, FIG. 7 is a view of the upper partition wall seen from above, FIG. 8 is the same side view, FIG. 9 is the same front view, and FIG. 10 is arranged near the generator. It is a figure which shows the structure of the shielding plate. FIG. 11 is a rear view of the muffler, FIG.
2 is a plan view, FIG. 13 is a left side view, and FIG. 14 is a right side view.

First, the overall configuration of the power generator will be described with reference to FIGS. 1 to 3. A frame 10 is arranged in the lower part of the power generator 1, and the constituent elements of the power generator 1 are arranged on the lower frame 10. A soundproof cover is provided on the lower frame 10 to improve the soundproof effect. In the power generation device 1,
The lower frame 10 and the soundproof cover constitute a casing of the power generation device 1. The power generator 1 is provided with a control panel 2 and a power outlet 3 on the side surface on the short side, and opening / closing doors 4 and 5 on the side surface on the long side. The control panel 2 controls the power generation device 1 and displays the operating state. Then, the electric power generated in the power generator 1 is taken out by connecting a wire to the power supply outlet 3.

The open / close doors 4 and 5 are constructed to open symmetrically from the center to the left and right sides. As a result, the amount of opening on the side surface of the power generation device 1 can be increased, and maintainability can be improved. Further, intake ports 6 and 7 and a fuel display window 8 are provided on the side surface on the long side of the power generator 1. On the upper part of the power generation device 1, a locking portion 9 for hanging the power generation device 1 is provided. A reinforcing member 61 is disposed in the locking portion 9 in the vertical direction.

An engine 11, a generator 12, a fuel tank 13 and a battery 14 are arranged in the power generator 1. A generator 12 is connected to the engine 11,
The generator 12 is driven by the output shaft of the engine 11. A battery 14 is arranged beside the generator 12, and a fuel tank 13 is arranged above the generator 12. In FIG. 2, a partition wall 31 standing vertically is provided on the left side of the generator 12, and an intake port 6 is provided on the left side of the partition wall 31. A partition wall 32 that partitions the generator 12 and the fuel tank 13 is horizontally arranged on the partition wall 31. A shielding plate 25 is arranged on the left side of the fuel tank 13 to reduce the noise of the engine 11 transmitted to the control box 26 side.

A fan 21, a radiator 17, and mufflers 22 and 23 are arranged on the right side of the engine 11. A guide 24 is arranged above the muffler 22. The guide 24 exhausts the cooling air generated by the fan 21 to the exhaust port 30.
And is disposed at the upper corner of the power generation device 1. The guide 24 is formed in a T shape as shown in FIG. 2, and is arranged from the front side to the back side of the paper. The air exhaust port 30 is provided substantially in the center of the upper surface of the power generation device 1. Therefore, in the power generation device 1, the air can be discharged from the position farthest from the outer peripheral portion, and the influence on the surroundings can be reduced.

An air cleaner 16 is arranged above the engine 11, and an upper partition wall 1 is provided above the air cleaner 16.
8 are provided. The upper partition wall 18 is arranged between the engine 11 and the exhaust port 30. This allows
Noise generated by the engine 11 does not directly go out of the power generation device 1 through the exhaust port 30. Air Cleaner 1
6 is attached to the stay 35 shown in FIG.
An intake chamber 15 is arranged on the lower surface of the upper partition wall 18, and air is introduced into the intake chamber 15 via an intake pipe 34. The intake chamber 15 is connected to the air cleaner 16, and air is supplied to the air cleaner 16 via the intake chamber 15. The air introduced into the air cleaner 16 is supplied to the engine 11. In the power generation device 1, the engine 11
The generator 12 is attached to the lower frame 10 via a vibration isolator. Engine 1 on frame 10
1 and the generator 12 are provided with a pedestal, and the engine 1 is mounted on the pedestal through the vibration-proof materials 27 and 28.
1 and a generator 12 are arranged. Therefore, the vibration transmitted to the cover of the power generation device 1 is reduced and the noise is suppressed.

An intake port and an exhaust port are provided in the upper part of the engine 11, and a central portion of the engine 11 is composed of a cylinder block and a crankcase of the engine 11. The cylinder block accommodates a piston inside and has a cooling water path inside. The crankcase supports the crankshaft. Therefore, the rigidity of the cylinder block and the crankcase is high. An oil pan 29 is provided below the engine 11. A drain 33 is connected to the oil pan 29 so that engine oil can be discharged from the outside of the lower frame 10.

Next, the structure of the opening / closing door 5 will be described with reference to FIGS. The opening / closing door 5 is configured to be openable / closable on the side surface of the power generator 1. As shown in FIG. 4, an intake port 7 is provided on the front surface of the opening / closing door 5, and air is introduced into the power generation device 1 through the intake port 7. A hinge 41 is attached to the side end of the opening / closing door 5.
41 is fixed and is configured to be openable and closable around the hinges 41. Further, a grip portion 44 is provided on the side opposite to the side where the hinge 41 is provided,
The opening / closing door 5 is opened / closed by the grip portion 44. The opening / closing door 5 is mainly composed of a front surface portion 42 and an intake duct 43. The front surface portion 42 constitutes the front surface of the opening / closing door 5, and is located on the outer surface of the power generator 1. The intake port 7 is provided in the lower portion of the front surface portion 42 on the hinge 41 side as described above. The intake duct 43 is attached to the rear surface of the front portion 42.

The intake duct 43 is fixed to the front surface portion 42 by a fastener such as a bolt. Intake duct 43
The rear surface (the surface located inside the power generation device) is configured to be flat and has a configuration in which there is little overhang into the power generation device. A plate 49 is configured in the intake duct 43, and the plate 49 of the intake duct 43 and the front surface portion 42 are fixedly mounted by a fastener. The intake duct 43 is detachable from the front surface portion 42. The intake duct 43 is provided with an outside air outlet 45, and the air introduced from the intake port 7 of the front face portion 42 is introduced into the power generator 1 from the outside air outlet 45.

Sound absorbing materials 46, 47 and 48 are arranged between the front surface portion 42 and the intake duct 43. The sound absorbing material 46 is arranged on the back surface of the front surface portion 42. In the sound absorbing material 46, the portion corresponding to the intake port 7 is cut out, and the sound absorbing material 46 does not hinder the introduction of air from the intake port 7. Further, the sound absorbing material 46 has a configuration in which a portion corresponding to a bolt mounting portion for attaching the intake duct 43 to the front surface portion 42 is cut out so that the intake duct 43 can be reliably attached to the front surface portion 42. . The sound absorbing material 47 is disposed on the inner upper surface and the inner side surface of the intake duct 43, and the adsorbent 48 is disposed on the inner front surface of the intake duct 43. Adsorbent 48
The outside air outlet 45 side portion has a configuration in which a portion overlapping the outside air outlet 45 is cut out.

The intake duct 43 is fixed to the rear surface of the front surface portion 42 and is integrally formed with the opening / closing door 5. As a result, the degree of freedom of the arrangement position of the intake port 7 and the arrangement position of the outside air outlet 45 can be improved, and the intake port 7 and the outside air outlet 45 can be easily provided at a position where noise is low in the power generator. The noise-reducing position in the power generation device 1 can be reduced by arranging it in a position where engine noise is low, a position where generator noise is low, a cooling wind noise of the generator is low, or the like. . Further, since the intake duct 43 is fixedly installed on the opening / closing door 5, the rigidity of the opening / closing door 5 is improved, and noise from the side portion of the power generation device 1 can be reduced. Further, since the rear surface of the intake duct 43 is flat, it is possible to reduce the number of parts of the sound absorbing material to be attached to the inside of the intake duct 43 and the number of attaching steps. Furthermore, the length of the intake path in the intake duct 43 can be increased, and the sound absorbing effect can be improved. The opening / closing door 5 serves as a double partition wall to enhance the sound insulation effect.

Next, referring to FIGS. 7 to 9, the upper partition wall 1
The configuration of No. 8 will be described. The upper partition 18 is the power generator 1
It is arranged in the upper part of the engine 11 from one side surface to the opposite side. The upper partition 18 is connected to the radiator mounting portion 65 and the reinforcing member 61. Thus, in the power generator 1, an exhaust path using the inner surface of the soundproof cover can be configured, and the noise can be reduced while making the power generator 1 compact. Furthermore, the engine room and the exhaust path on the downstream side of the radiator 17 can be reliably separated, and the cooling effect can be improved. The intake chamber 15 is connected to the lower surface of the upper partition wall 18, and the guide 51 is disposed on the upper surface.

The guide portion of the guide 51 extends toward the exhaust port 30, and the guide 51 is arranged in a direction perpendicular to the exhaust path. The upper partition wall 18 has a configuration in which the side on which the intake chamber 15 is disposed is lowered by one step, and the guide 51 is disposed on the upper surface of the portion that is lowered by one step. The guide 51 serves as a baffle plate against the noise passing over the upper partition wall 18. When the sound wave of the noise hits the guide 51, the sound wave is dispersed and the sound deadening effect is improved. Furthermore, a sound absorbing material is attached to the exhaust path side (exhaust path side) of the guide 51, whereby a further sound deadening effect can be obtained. Further, the guide 51 may be arranged horizontally as well as in the oblique direction with respect to the exhaust path as described above.

The intake chamber 15 has a lower pipe 54 and side pipes 53 for communicating the inside and outside of the intake chamber 15.
Is provided. A plurality of partition plates 52, 52 ... Are arranged in the intake chamber 15. A lower pipe 54 is arranged on the bottom surface of the intake chamber 15. The intake pipe 34 is connected to the lower pipe 54, and the air in the power generator 1 is introduced into the intake chamber 15 via the intake pipe 34 and the lower pipe 54. A side pipe 53 is arranged on the side surface of the intake chamber 15. Side pipe 5
An air cleaner 16 is connected to 3. The lower pipe 54 and the side pipe 53 are connected to the intake chamber 1
It has a configuration in which a certain amount is projected into the inside of 5. By adjusting the amount of protrusion into the intake chamber 15, the frequency characteristic of the intake chamber 15 can be adjusted, and the sound deadening effect can be improved.

The partition plate 52 arranged in the intake chamber 15 is arranged so as to block the straight line path connecting the outlet side of the lower pipe 54 and the side pipe 53. The partition plate 52 is connected to one inner surface of the intake chamber 15,
The structure is such that the inner surfaces are alternately connected to each other. As a result, the intake path in the intake chamber 15 can be lengthened, a maze can be formed, and the sound absorbing effect can be improved.

The radiator 17 is connected at its upper portion to the radiator mounting portion 65, and is connected at its lower portion to the radiator mounting portion 62. And the radiator mounting portion 62
A guide plate 63 is fixed to the upper part of the. Guide plate 6
Reference numeral 3 is configured in a V shape when viewed from the side, and directs exhaust air discharged through the radiator upward. The exhaust air directed upward by the guide plate 63 is directed toward the upper partition wall 18 by the guides 24 arranged at the corners of the housing of the power generator 1. The exhausted air that has passed over the upper partition wall 18 is directed to the exhausted air outlet 30 by the guide plate 64 arranged near the locking portion 9. The guide plate 64 is arranged downstream of the exhaust air in the upper partition wall 18, and is arranged obliquely with respect to the upper partition wall 18. As a result, the muffling effect can be improved while reducing the exhaust air resistance. A seal member such as a weather strip is attached to the upper end of the guide plate 64.
The noise of the engine 11 is prevented from leaking from between the soundproof cover and the soundproof cover, and rainwater and dust are prevented from entering.

Next, the construction of the shielding plates 55 and 56 arranged near the generator 12 will be described with reference to FIG. The shield plate 56 is perpendicular to the axial direction of the generator 12,
The shield plate 55 is disposed above the upper portion, and is similarly disposed below the lower portion of the generator 12.
The lower portion of the shielding plate 56 is cut out in an arc shape, and the cutout portion is arranged along the upper portion of the generator 12. In addition, the upper portion of the shielding plate 55 is also the generator 12
Is cut along the lower portion of the generator 12 and is arranged along the lower portion of the generator 12. Shield plate 56/55
Is disposed on the radial surface of the generator 12 so as to close the projection surface inside the housing of the power generator 1. As a result, it is difficult for noise generated by the engine to propagate to the generator 12 side, and noise can be reduced. The shielding plate 56
A gap is provided between the lower end of the cooling plate and the upper end of the shielding plate 55, and the cooling air passes through the gap. A gap is also provided between the lower end of the shield plate 56 and the generator 12, and between the upper end of the shield plate 55 and the generator 12.
The cooling air flows along the outer peripheral surface of No. 2.

Next, the arrangement of the mufflers 22 and 23 will be described with reference to FIGS. 11 to 14. Muffler 2
2 and 23 are configured in the shape of an elliptic cylinder, and are arranged with the elliptical surface facing left and right. Muffler 22.2
The muffler 2 is located below the muffler 3
Reference numeral 3 denotes a body that is inclined in the front-rear direction. The muffler 23 is fixed with the engine 11 side lowered. A pipe 85 is connected to the muffler 23, and a pipe 85 and a pipe 84 are connected to the muffler 23. The pipe 85 is connected to the exhaust port of the engine 11 so that the exhaust gas of the engine 11 is pipe 8
It is introduced into the muffler 23 via 5. The pipe 84 connects the muffler 22 and the muffler 23. The exhaust gas discharged from the muffler 23 is pipe 8
It is introduced into the muffler 22 through 4. The exhaust gas introduced into the muffler 22 is discharged through the pipe 86.

The mufflers 22 and 23 are connected by a stay 81 and a plate 83. The stay 81 and the plate 83 are fixed to the elliptical surfaces of the mufflers 22 and 23, and the muffler 23 is fixed to the stay 82.
The mufflers 22 and 23 are fixed to the casing of the power generator 1 by stays 81 and 82.

Since the mufflers 22 and 23 have a structure in which two common mufflers are arranged and connected by piping, the mufflers 22 and 23 have the same parts and the manufacturing cost can be reduced. By connecting the muffler 22 and the muffler 23 in series, it is possible to arrange the muffler having a high sound deadening effect even in a small space while improving the sound deadening effect. By arranging the mufflers 22 and 23 on the upper and lower sides, the exhaust noise of the engine can be reduced while the power generation device 1 is made compact.
By arranging a plurality of mufflers in parallel with each other, it is difficult to disturb the airflow generated in the vicinity of the muffler, the capacity of the muffler can be increased in a space-saving manner, and a muffler having a large sound deadening effect can be configured.

Next, another embodiment of the present invention will be described with reference to the drawings. FIG. 15 is a perspective view of a power generator having another structure, FIG. 16 is a side view showing an internal structure of the power generator having another structure, FIG. 17 is a plan view of the same, and FIG. 18 is a first embodiment of the other structure. FIG. 19 is a side view showing the arrangement of mufflers, FIG. 19 is a side view showing the arrangement of mufflers of the second embodiment in another arrangement, and FIG. 20 is a side view showing the arrangement of mufflers of the third embodiment in another arrangement. Is.

First, the overall structure of the power generator will be described with reference to FIGS. A frame 10 is arranged in the lower part of the power generator 1, and the constituent elements of the power generator 1 are arranged on the lower frame 10. A soundproof cover is provided on the lower frame 10 to improve the soundproof effect. In the power generator 1, the lower frame 10 and the soundproof cover constitute a casing of the power generator 1. The power generator 1 is provided with a control panel 2 on one side surface on the short side and is provided with opening / closing doors 4.5 on one side surface on the long side. The control panel 2 controls the power generation device 1 and displays the operating state. Further, the generated power is taken out, and the power generated in the power generation device 1 is taken out by connecting a wire to the power supply outlet 3. The power outlet 3 is located below the opening / closing door 4.

The open / close doors 4 and 5 are constructed to open symmetrically from the center to the left and right sides. This makes it possible to increase the amount of opening on one side surface of the power generation device 1 and improve maintainability. In addition, intake ports 6 and 7 are provided on one side surface on the long side of the power generator 1. The intake ports 6 and 7 are the lower part of the power generator 1, and the lower frame 1
It is provided above 0. On the upper part of the power generation device 1, a locking portion 9 for hanging the power generation device 1 is provided.

An engine 11, a generator 12, a fuel tank 13 and a battery 14 are arranged in the power generator 1. A generator 12 is connected to the engine 11,
The generator 12 is driven by the output shaft of the engine 11. The engine 11 is arranged substantially in the center of the housing, a generator 12 is arranged on one side, a fuel tank 13 is arranged on the other side, and a battery 14 is arranged above the generator 12.

In FIG. 16, a partition wall 31 is provided vertically on the side surface of the housing of the generator 12, and an intake port 6 is provided further on the side surface of the housing than the partition wall 31. ing. The control box 26 is controlled by the partition wall 31.
It is configured to reduce heat and noise transmitted to the.

A fan 21, a radiator 17, and mufflers 22 and 23 are arranged on the fuel tank 13 side of the engine 11. A guide 24 is provided above the mufflers 22 and 23.
Is provided. The guide 24 guides the cooling air generated by the fan 21 to the side of the exhaust port 30, and is arranged at the upper corner of the power generator 1. The air exhaust port 30 is provided substantially in the center of the upper surface of the power generation device 1. Therefore, in the power generation device 1, the air can be discharged from the position farthest from the outer peripheral portion, and the influence on the surroundings can be reduced.

An air cleaner 16 is arranged above the generator 12, and an intake chamber 15 is arranged above the air cleaner 16. The intake chamber 15 is fixed to the back surface of the ceiling of the housing. Intake pipes 34 and 36 are connected to the intake chamber 15.
Air is introduced into the intake chamber 15 via the intake pipe 34. The air that has passed through the intake chamber 15 is introduced into the air cleaner 16 through the intake pipe 36. Then, the air introduced into the air cleaner 16 is transferred to the engine 11
Will be supplied to. In the power generator 1, the engine 11 and the generator 12 are attached to the lower frame 10 via a vibration isolator. The lower frame 10 is provided with a pedestal for mounting the engine 11 and the generator 12, and the engine 11 and the generator 12 are arranged on this pedestal via the vibration-proof materials 27 and 28. Therefore, the vibration transmitted to the lower frame 10 is reduced, and the noise generated from the cover of the power generator 1 is suppressed.

The open / close doors 4 and 5 are configured to be openable / closable on one side of the power generator 1 on the long side. Figure 1
As shown in FIG. 5, an intake port 7 is provided on the front surface of the opening / closing door 5, and air is introduced into the power generation device 1 through the intake port 7. A hinge is fixedly installed at the side end of the opening / closing doors 4 and 5, and is configured to be openable / closable around the hinge. It is possible to fix a duct on the back surface of the opening / closing door 5, introduce outside air into the duct from the intake port 7, and supply air into the housing through the duct. As the duct, it is possible to use a box-shaped duct in which a sound absorbing material is attached to the inner surface. Then, in the duct attached to the opening / closing door 5, an opening for discharging air is provided at a position apart from the intake port 7 provided in the opening / closing door 5. This makes it possible to reduce the noise leaking from the intake port 7. That is, the intake passage can be made long while maintaining a large cross-sectional area of the intake passage, and the sound absorption effect can be improved while reducing the intake resistance.

Next, the structure of the upper partition 18 will be described. The upper partition wall 18 is disposed above the engine 11 between the side surfaces on the long side of the power generator 1. The upper partition 18 is connected to the radiator mounting portion 65. The radiator mounting portion 65 is connected to the upper portion of the radiator 17, and the shield plate 71 is provided on the lower portion of the radiator 17.
Are connected. The shield plate 71 is arranged horizontally in the housing. The mufflers 22 and 23 are arranged above the shielding plate 71, and the fuel tank 13 is arranged below the muffler.

The upper partition wall 18, the radiator mounting portion 65, the shielding plate 71, and the guide 24 make it possible to construct an exhaust path in the power generator 1 utilizing the inner surface of the soundproof cover. For this reason, it is possible to lengthen the exhaust path while reducing the size of the power generation device 1 and reduce noise. Furthermore, the engine room and the exhaust path on the downstream side of the radiator 17 can be reliably separated, and the cooling effect can be improved.

Next, the first embodiment of the arrangement of the muffler will be described with reference to FIG. Muffler 22 ・ 23
Is elliptical or oval in side view,
The elliptical surface or the oval surface is arranged so as to face the long side of the power generation device 1. The mufflers 22 and 23 are arranged side by side in parallel in a vertical connection in the housing, and the muffler 22 is arranged above the muffler 23. The mufflers 22 and 23 are arranged in front of the radiator 17 on the cooling air discharge side, and are fixed in a state where the radiator 17 side is tilted low in a side view.

A pipe 85 is connected to one of the left and right sides of the muffler 23, and the pipe 85 has a radiator mounting portion 65.
Is connected to the exhaust manifold of the engine 11. On the other side of the muffler 23, a pipe 84
Are connected, and a pipe 84 and a pipe 86 are connected to the muffler 22. The pipe 84 is the muffler 2
2 and the muffler 23 are connected, and the pipe 86 discharges the exhaust gas to the outside of the housing. The exhaust gas of the engine 11 is introduced into the muffler 23 by the pipe 85 and is supplied to the muffler 22 via the pipe 84. Then, the exhaust gas passing through the muffler 22 is discharged from the pipe 86. In addition, the mufflers 22 and 23 are
The shielding plate 71 is fixed by a fixing member 87 placed on the shielding plate 71, and the shielding plate 71 is fixed to the lower frame 10 via a vibration isolating member so that vibrations due to the mufflers 22 and 23 are not transmitted to the housing. The noise from vibration of the housing is prevented. Although the number of mufflers is two in this embodiment, the number of mufflers is not limited to this and may be one or three or more.

With such a structure, the cooling air generated from the engine 11 side toward the radiator 17 by the fan 21 passes above the shielding plate 71 via the radiator and passes through the muffler 22 as shown by the arrow in FIG. Guided by 23, the cooling air is directed upward and reaches the upper portion of the power generation device 1.
Then, the cooling air is directed toward the air exhaust port 30 side by the guide 24 and is exhausted from the air exhaust port 30 to the outside of the housing along the upper partition wall 18. In this way, the inside of the casing of the power generator 1 is partitioned by the upper partition wall 18, the radiator mounting portion 65, and the shield plate 71, and the engine 11 and the generator 12 are arranged on one side.
The muffler 22/23 is arranged on the other side, and the side on which the engine 11 and the generator 12 are arranged is the upstream side of the cooling air, so that the cooling efficiency in the power generator 1 is improved and the noise is reduced. You can Further, by fixing the mufflers 22 and 23 arranged on the cooling air discharge side of the radiator 17 in a state where the radiator 17 side is lowered, the flow of the cooling air is not obstructed by the mufflers 22 and 23, and the radiator 17
The cooling air from the air flows smoothly to the exhaust port 30, heat balance performance can be improved, and the flow of the cooling air does not become a turbulent flow, and the sound generated by the turbulent flow can be prevented. .

Next, a second embodiment of the arrangement of the muffler will be described with reference to FIG. Similar to the first embodiment, the muffler 22 is formed in an elliptical shape or an oval shape in a side view, and is arranged with the elliptical surface or the oval surface facing the long side of the power generation device 1. The muffler 22 is arranged above the cooling air discharge side of the radiator and is fixedly installed with the engine side raised. A pipe 85 from the exhaust manifold of the engine 11 is connected to one of the left and right sides of the muffler 22, and a pipe 86 for discharging the exhaust gas to the outside of the housing is connected to the other side.
The muffler 22 is fixed by a fixing member 87 mounted on the shielding plate 71, as in the first embodiment. The muffler 22 can also be attached to the housing via a vibration isolator or the like. By doing this, the muffler 22
The vibration due to vibration is prevented from being transmitted to the housing, and noise due to the vibration of the housing is prevented.

With such a configuration, the cooling air generated from the engine 11 side toward the radiator 17 by the fan 21 passes above the shield plate 71 through the radiator 17 and goes upward as shown by the arrow in FIG. The cooling air directed toward the air is directed to the exhaust air outlet 30 side by the muffler 22, and the upper partition wall 1
8 is discharged from the air outlet 30 to the outside of the housing. Thus, by fixing the muffler 22 arranged above the cooling air discharge side of the radiator 17 in a state where the radiator 17 side is raised, the flow of the cooling air is not blocked by the muffler 22 and the cooling from the radiator 17 is prevented. The wind is smoothly exhausted 3
It is possible to improve the heat balance performance, and the flow of the cooling air does not become a turbulent flow, and it is possible to prevent the sound generated by the turbulent flow.

Next, a third embodiment of the arrangement of the muffler will be described with reference to FIG. Similar to the first embodiment, the mufflers 22 and 23 are formed in an elliptical shape or an oval shape in a side view, and are arranged so that the elliptical or oval surface faces the long side of the power generation device 1. The mufflers 22 and 23 are arranged on the front surface of the radiator on the cooling air discharge side and above the cooling air discharge side. The muffler 22 arranged in front of the cooling air discharge side of the radiator 17 is fixed with the engine side raised, and the muffler 23 arranged above the cooling air discharge side of the radiator 17 is lowered in the engine side. It is fixed at. Other configurations are similar to those of the first embodiment. Although the number of mufflers is two in this embodiment, the number is not limited as long as it is two or more.

With such a configuration, the cooling air generated from the engine 11 side toward the radiator 17 by the fan 21 passes above the shield plate 71 via the radiator as shown by the arrow in FIG. 20, and passes through the muffler 23. Thus, the cooling air is directed upward and reaches the upper portion of the power generation device 1. Then, the cooling air directed upward is directed by the muffler 22 to the side of the exhaust port 30 and is exhausted from the exhaust port 30 to the outside of the housing along the upper partition wall 18. Thus, the muffler 23 arranged on the front side of the radiator 17 on the cooling air discharge side is fixed in a state where the radiator 17 side is lowered, and the muffler 22 arranged on the upper side of the cooling air discharge side is raised on the radiator 17 side. By fixing in such a state that the cooling air flow is not obstructed by the mufflers 22 and 23, the cooling air from the radiator 17 flows smoothly to the exhaust port 30, and the heat balance performance can be improved. There is no turbulence in the flow of wind,
It is possible to prevent the sound generated by the turbulent flow.

[0047]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as described in claim 1, power generation in which a cooling air intake for cooling an engine, a generator and the like is provided on a side plate of a power generator casing, and a cooling air exhaust is provided above a cooling air supply side of a radiator. Since the device is provided with one or more small mufflers connected to the engine, it is possible to easily increase the capacity of the silencer while suppressing the size of the soundproof case itself which is the casing of the power generator. .

Since the muffler has an elliptical shape or an oval shape in a side view as described in claim 2, it is difficult to obstruct the flow of the cooling air and the flow resistance of the cooling air can be reduced. Furthermore, even in a limited space, a plurality of mufflers can be arranged and the capacity can be increased.

As described in claim 3, since the muffler is arranged in front of the cooling air discharge side of the radiator and fixed by tilting the radiator side of the muffler downward, the flow of the cooling air is not obstructed by the muffler and the radiator is prevented. The cooling air from the air smoothly flows to the cooling air outlet, and the heat balance performance can be improved. Moreover, the flow of the cooling air does not become a turbulent flow, and the sound generated by the turbulent flow can be prevented.

As described in claim 4, since the muffler is arranged above the cooling air discharge side of the radiator, and the radiator side of the muffler is inclined and fixed upward, the flow of cooling air is not obstructed by the muffler. The cooling air from the radiator smoothly flows to the cooling air outlet, and the heat balance performance can be improved. Moreover, the flow of the cooling air does not become a turbulent flow, and the sound generated by the turbulent flow can be prevented.

According to a fifth aspect of the present invention, the muffler is provided in front of the cooling air discharge side of the radiator and above the cooling air discharge side, and the muffler provided in front of the cooling air discharge side of the radiator is
The radiator side of the muffler is inclined and fixed downward, and the muffler provided above the cooling air discharge side of the radiator is fixed by inclining the radiator side of the muffler upward, so that the flow of cooling air is not obstructed by the muffler. The cooling air from the radiator smoothly flows to the cooling air outlet, and the heat balance performance can be improved. Moreover, the flow of the cooling air does not become a turbulent flow, and the sound generated by the turbulent flow can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of a power generator.

FIG. 2 is a side view showing the internal configuration of the power generator.

FIG. 3 is a rear view of the same.

FIG. 4 is a front view showing a configuration of an opening / closing door.

FIG. 5 is a partially cutaway side view of the same.

FIG. 6 is a view showing an assembly configuration of an opening / closing door.

FIG. 7 is a view of the upper partition seen from above.

FIG. 8 is a side view of the same.

FIG. 9 is a front view of the same.

FIG. 10 is a diagram showing a configuration of a shield plate arranged near the generator.

FIG. 11 is a rear view of the muffler.

FIG. 12 is a plan view of the same.

FIG. 13 is a left side view of the same.

FIG. 14 is a right side view of the same.

FIG. 15 is a perspective view of a power generator having another configuration.

FIG. 16 is a side view showing an internal configuration of a power generator having another configuration.

FIG. 17 is a plan view of the same.

FIG. 18 is a side view showing an arrangement configuration of the muffler of the first embodiment in another configuration.

FIG. 19 is a side view showing the arrangement configuration of the muffler of the second embodiment in another configuration.

FIG. 20 is a side view showing the arrangement of the muffler of the third embodiment in another configuration.

[Explanation of symbols]

1 generator 5 open / close door 11 engine 12 generator 15 Intake chamber 17 Radiator 18 Upper partition 22.23 muffler 24 guides 30 Cooling air outlet (air outlet)

Claims (5)

[Claims] 1. A power generator which has a cooling air intake for cooling an engine, a generator and the like on a side plate of a power generator casing, and a cooling air exhaust above a cooling air supply side of a radiator. A soundproof power generation device, characterized in that at least one small muffler is connected to the. 2. The soundproof power generator according to claim 1, wherein the muffler has an elliptical shape or an oval shape in a side view. 3. The soundproof power generator according to claim 2, wherein the muffler is disposed in front of the radiator on the cooling air discharge side, and the radiator side of the muffler is fixed by inclining downward. 4. The soundproof power generator according to claim 2, wherein the muffler is arranged above a cooling air discharge side of a radiator, and the radiator side of the muffler is inclined and fixed upward. 5. The muffler, wherein the muffler is disposed on the front side of the cooling air discharge side of the radiator and above the cooling air discharge side of the radiator, and the muffler provided on the front side of the cooling air discharge side of the radiator is such that the radiator side of the muffler is inclined downward. The soundproof power generator according to claim 2, wherein the muffler that is fixed and is provided above the cooling air discharge side of the radiator is fixed by inclining the radiator side of the muffler upward.