JP3803914B2 - Soundproof power generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique for reducing noise generated from a power generation device. More specifically, the present invention relates to a vibration isolating structure for reducing noise on the intake side in a package type power generator.
[0002]
[Prior art]
The soundproof power generator is used to supply power at a construction site or the like, and the soundproof power generator is transported to the site and generates power.
Conventionally, what is shown in Unexamined-Japanese-Patent No. 2000-282885 is known as a soundproof technique of a soundproof type generator.
This is because an exhaust muffler, an engine cooling fan, an engine, a generator, and a fuel tank are provided in a soundproof case, an exhaust side space is formed on the front side of the cooling fan, and the exhaust muffler is stored on the rear side of the engine cooling fan. A wind-absorbing side space is configured, and the exhaust-side space is configured to be divided up and down by a sound absorbing material.
[0003]
[Problems to be solved by the invention]
However, in the technique disclosed in Japanese Patent Application Laid-Open No. 2000-28285, although a sound absorbing material is provided on the exhaust side, noise countermeasures due to vibrations of the intake chamber itself, which introduces air into the engine, in particular, are introduced. It is not clear. The noise on the intake side is caused by the pulsation of the engine due to the intake pressure intermittently changing according to the valve opening timing of each cylinder of the engine.
The intake chamber is originally intended to reduce the intake noise caused by the pulsation of the engine, but the intake chamber itself also causes vibrations due to the propagation of the pulsation of the engine.
Therefore, the reduction of the intake sound for sound propagation can be reduced by pasting the sound absorbing material, which has been dealt with in the past, but the vibration of the intake duct itself could not be suppressed. It also propagated to the upper partition wall, causing vibrations of the casing to which the upper partition wall and the upper partition wall are connected, and thus noise. In addition, when the resonance phenomenon occurred, the noise was further increased.
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0005]
Upper surface substantially center of the housing of the generator 1 in providing the exhaust outlet 30, above the engine 11 that is disposed in the housing of the generator 1, to place the air cleaner 16, above the air cleaner 16, an upper septum wall 18 The upper partition wall 18 is disposed in a horizontal direction between the engine 11 and the exhaust port 30, and noise generated from the engine 11 directly goes out of the power generator 1 from the exhaust port 30. In the soundproof type power generator configured not to be provided, an intake chamber 15 is disposed on the lower surface of the upper partition wall 18, and the intake chamber 15 introduces air through an intake pipe 34, and the intake chamber 15 and the air cleaner 16 are arranged. Are connected to each other through a pipe, and the air introduced into the air cleaner 16 is supplied to the intake port of the engine 11, and an elastic member is provided between the intake chamber 15 and the upper partition wall 18. The isolator 80 made of a material in which is interposed.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the invention will be described.
1 is a perspective view of the power generator, FIG. 2 is a side view showing the internal configuration of the power generator, FIG. 3 is a rear view showing the internal configuration of the power generator, FIG. 4 is a front view showing the configuration of the door, and FIG. 6 is a partially cutaway side view showing the configuration of the door, FIG. 6 is a view showing the assembly structure of the door, FIG. 7 is a top view of the conventional upper partition, FIG. 8 is a side view of the conventional upper partition, FIG. 9 is a front view of a conventional upper partition, FIG. 10 is a view showing a method for mounting and supporting an intake chamber according to the present invention, FIG. 11 is a view showing a first embodiment, and FIG. 12 is a view showing a second embodiment. FIG. 13 is a diagram showing a third embodiment.
[0007]
First, the overall configuration of the power generation device will be described with reference to FIGS. 1 to 3.
The power generation device 1 is provided with a frame 10 at the bottom, and the components of the power generation device 1 are provided on the lower frame 10.
A soundproof cover is mounted on the lower frame 10 to improve the soundproofing effect. In the power generation device 1, the lower frame 10 and the soundproof cover constitute a housing of the power generation device 1.
[0008]
The power generation device 1 is provided with a control panel 2 and a power outlet 3 on the side surface on the short side, and with open / close doors 4 and 5 on the side surface on the long side. The control panel 2 controls the power generator 1 and displays the operation state. And the electric power generated in the power generator 1 is taken out by connecting a wire to the power outlet 3.
[0009]
The open / close doors 4 and 5 are configured to open symmetrically from the center to the left and right sides. Thereby, the opening amount in the side surface of the electric power generating apparatus 1 can be taken large, and maintainability can be improved.
[0010]
In addition, intake ports 6, 7, 19 and a fuel display window 8 are provided on the side surface of the power generator 1 on the long side. At the upper part of the power generation device 1, a locking portion 9 for suspending the power generation device 1 is provided.
A reinforcing member 61 is disposed in the locking portion 9 in the vertical direction. The reinforcing member 61 is connected to the lower frame 10 from the upper part of the power generator 1.
[0011]
An engine 11, a generator 12, a fuel tank 13, and a battery 14 are disposed in the power generator 1. A generator 12 is connected to the engine 11, and the generator 12 is driven by the output shaft of the engine 11.
A battery 14 is disposed on the side of the generator 12, and a fuel tank 13 is disposed above the generator 12.
[0012]
In FIG. 2, a partition wall 31 erected in the vertical direction is disposed on the left side of the generator 12, and the intake port 6 is disposed on the left side of the partition wall 31. A partition wall 32 that partitions the generator 12 and the fuel tank 13 from the upper and lower middle portions of the partition wall 31 is disposed in the horizontal direction.
A shielding plate 25 is disposed on the left side of the fuel tank 13 to reduce the noise of the engine 11 transmitted to the control box 26 side. The partition wall 32 also serves as a support for the fuel tank 13.
On the right side of the engine 11, a fan 21, a radiator 17, and mufflers 22 and 23 are disposed. A guide 24 is disposed above the muffler 22. The guide 24 guides the cooling air generated by the fan 21 to the air outlet 30 and is disposed at the upper corner of the power generator 1.
The guide 24 is configured in a T shape as shown in FIG. 2, and is arranged from the front side of the paper toward the back direction. In addition, a sound absorbing material 36 is affixed to the guide 24 to improve the silencing effect.
The air exhaust port 30 is provided substantially at the center of the upper surface of the power generation device 1. For this reason, in the electric power generating apparatus 1, it can exhaust from the position most distant from an outer peripheral part, and can reduce the influence which it has on the circumference | surroundings.
[0013]
An air cleaner 16 is disposed above the engine 11, and an upper partition wall 18 is disposed above the air cleaner 16. The upper partition wall 18 is disposed horizontally between the engine 11 and the exhaust port 30. As a result, noise generated from the engine 11 does not directly go out of the power generation apparatus 1 through the exhaust port 30. The air cleaner 16 is attached to the stay 35 shown in FIG. 3 via a vibration isolator.
An intake chamber (intake duct, resonator) 15 is disposed on the lower surface of the upper partition wall 18, and air is introduced into the intake chamber 15 through an intake pipe 34. The intake chamber 15 is connected to an air cleaner 16 through a pipe, and air is supplied from the intake chamber 15 to the air cleaner 16. The air introduced into the air cleaner 16 is supplied to the intake port of the engine 11.
In the power generator 1, the engine 11 and the generator 12 are attached to the lower frame 10 via a vibration isolator. The 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 disposed on the pedestal via vibration isolating materials 27 and 28. For this reason, the vibration transmitted to the cover of the power generator 1 is reduced and noise is suppressed.
[0014]
An intake port and an exhaust port are provided in the upper part of the engine 11, and a central part of the engine 11 is constituted by a cylinder block and a crankcase of the engine 11. The cylinder block accommodates the piston inside and has a cooling water path inside. The crankcase supports the crankshaft.
An oil pan 29 is provided below the engine 11. A drain 33 is connected to the oil pan 29, and the engine oil can be discharged from the outside of the lower frame 10.
[0015]
In FIG. 3, partition plates 70 and 70 are disposed on the upper partition wall 18 along the exhaust path. The partition plates 70 and 70 are configured in parallel and are erected on the upper partition wall 18. The plurality of partition plates 70 are configured to direct the exhaust air from the corner portion of the power generation device 1 to the exhaust air outlet 30 and to mute the sound. A sound absorbing material is affixed to the partition plate 70 to reduce noise transmitted through the exhaust path.
The partition plate 70 is disposed in a direction along the exhaust air path (parallel to the exhaust air), but may be disposed obliquely with respect to the exhaust air. The leakage of engine noise can be reduced by increasing the projected area with respect to the flow direction of the exhaust air, and the exhaust resistance can be reduced by arranging the exhaust air along the direction of the exhaust air.
That is, it is possible to adjust the cooling air exhaust efficiency and noise reduction by the partition plate 70 disposed on the upper partition wall 18. Further, the silencing effect can be improved while suppressing the exhaust resistance.
[0016]
Next, the structure of the door 5 will be described with reference to FIGS.
The open / close door 5 is configured to be freely opened and closed on the side surface of the power generation device 1.
As shown in FIG. 4, an air inlet 7 is provided in front of the opening / closing door 5, and air is introduced into the power generator 1 through the air inlet 7. Hinges 41 and 41 are fixed to the side end portions of the opening and closing door 5, and are configured to be openable and closable around the hinges 41 and 41. Further, a handle portion 44 is provided on the side opposite to the side on which the hinge 41 is disposed, and the opening / closing door 5 is opened and closed by the handle portion 44.
The open / close door 5 is mainly composed of a front surface portion 42 and an intake duct 43. The front portion 42 constitutes the front of the open / close door 5 and is located on the outer surface of the power generator 1. As described above, the air inlet 7 is provided in the lower portion of the front portion 42 on the side where the hinge 41 is provided. An intake duct 43 is attached to the rear surface of the front portion 42.
[0017]
The intake duct 43 is fixed to the front surface portion 42 with a fastener such as a bolt. The rear surface of the intake duct 43 (the surface located inside the power generation device) is configured to be flat, and has a structure with little protrusion into the power generation device. A plate 49 is formed in the intake duct 43, and the plate 49 of the intake duct 43 and the front surface portion 42 are fixed by a fastener.
The intake duct 43 is configured to be removable from the front surface portion 42. The intake duct 43 is provided with an outside air outlet 45, and the air introduced from the air inlet 7 of the front surface portion 42 is introduced into the power generator 1 from the outside air outlet 45.
[0018]
Sound absorbing materials 46, 47, and 48 are disposed between the front portion 42 and the intake duct 43. The sound absorbing material 46 is disposed on the back surface of the front surface portion 42. In the sound absorbing material 46, a portion corresponding to the air inlet 7 is cut away, and the sound absorbing material 46 does not hinder the introduction of air from the air inlet 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, and the intake duct 43 is securely attached to the front surface portion 42. . A sound absorbing material 47 is disposed on the inner upper surface and the inner side surface of the intake duct 43, and a sound absorbing material 48 is disposed on the inner front surface of the intake duct 43. The portion of the sound absorbing material 48 on the outside air outlet 45 side is configured such that a portion overlapping the outside air outlet 45 is cut out.
[0019]
The intake duct 43 is fixed to the back surface of the front portion 42 and is integrally formed with the open / close door 5. Thereby, the freedom degree of the arrangement position of the inlet port 7 and the arrangement position of the outside air outlet 45 can be improved, and it can provide easily in the position with few noises in a generator. The position where the noise is low in the power generator 1 can be reduced by disposing the engine at a position where the engine noise is low, a position where the generator noise is low, a position where the generator cooling noise is low, and the like. .
Further, the intake duct 43 is fixed to the open / close door 5, whereby the rigidity of the open / close door 5 is improved and noise from the side portion of the power generator 1 can be reduced.
Further, the rear surface of the intake duct 43 is flat, and the number of parts and the number of attaching steps of the sound absorbing material to be attached to the inside of the intake duct 43 can be reduced.
Furthermore, the length of the intake path in the intake duct 43 can be increased, and the sound absorption effect can be improved. The opening / closing door 5 becomes a double partition, and the sound insulation effect is enhanced. Similarly, in the open / close door 4, noise can be reduced by introducing the air inlet 19 into the housing of the power generator 1 through a duct arranged on the inner surface of the open / close door 4.
[0020]
Next, the configuration of the upper partition wall 18 will be described with reference to FIGS. 2 and 7 to 9.
In FIG. 2, the upper partition wall 18 is disposed on the upper portion of the engine 11 from one side surface to the opposite side of the power generation device 1. The upper partition wall 18 is connected to the radiator mounting portion 65 and the reinforcing member 61. That is, the space between the ceiling plate constituting the upper part of the soundproof cover of the power generator 1 and the upper partition wall 18 is used as an exhaust duct.
Thereby, in the electric power generating apparatus 1, the exhaust path which utilized the inner surface of the soundproof cover can be comprised, and noise can be reduced, making the electric power generating apparatus 1 compact. Further, the engine room and the exhaust air flow path downstream from the radiator 17 can be reliably separated, and the cooling effect can be improved.
An intake chamber 15 is fixed to the lower surface of the upper partition wall 18 via a vibration isolation mechanism described later, and a guide 51 is disposed on the upper surface.
The guide portion of the guide 51 extends toward the air outlet 30, and the guide 51 is disposed in a direction perpendicular to the air exhaust path.
The guide 51 serves as a baffle plate for noise passing over the upper partition wall 18, and when the sound wave of noise hits the guide 51, the sound wave is dispersed and the silencing effect is improved.
Furthermore, a sound absorbing material is attached to the exhaust path side (exhaust path side) of the guide 51, and thereby a further silencing effect can be obtained.
Moreover, as an arrangement structure of the guide 51, it is also possible to make it horizontal in addition to the oblique direction with respect to the exhaust path as described above.
[0021]
The intake chamber 15 is provided with a lower pipe 54 and a side pipe 53 that communicate with the inside and outside of the intake chamber 15. In the intake chamber 15, a plurality of partition plates 52, 52,.
A lower pipe 54 is disposed on the bottom surface of the intake chamber 15. The lower pipe 54 is connected to the intake pipe 34, and 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 disposed on the side surface of the intake chamber 15. The air cleaner 16 is connected to the side pipe 53 via a pipe.
The lower pipe 54 and the side pipe 53 are configured to protrude into the intake chamber 15 by a certain amount. By adjusting the amount of protrusion into the intake chamber 15, the frequency characteristics of the intake chamber 15 can be adjusted, and the silencing effect can be improved.
[0022]
The partition plate 52 disposed in the intake chamber 15 is disposed so as to block a straight 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 and is configured to be connected to alternately facing inner surfaces.
As a result, the intake path in the intake chamber 15 is lengthened, a maze is formed, and the silencing effect can be improved.
[0023]
The radiator 17 is connected to the radiator mounting portion 65 at the upper portion and is connected to the radiator mounting portion 62 at the lower portion. A guide plate 63 is fixed to the upper portion of the radiator mounting portion 62.
The guide plate 63 is formed in a “<” shape when viewed from the side, and directs the 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 guide 24 disposed at the corner portion of the casing of the power generator 1.
The exhaust air passing over the upper partition wall 18 is directed to the exhaust air outlet 30 by the guide plate 64 disposed in the vicinity of the locking portion 9.
The guide plate 64 is disposed on the downstream side of the exhaust air in the upper partition 18 and is disposed obliquely with respect to the upper partition 18. Thereby, the silencing effect can be improved while reducing the exhaust resistance.
A seal member such as a weather strip is attached to the upper end of the guide plate 64 to prevent the noise of the engine 11 from leaking between the guide plate 64 and the soundproof cover and to allow rainwater and dust to enter. Is to prevent.
[0024]
Next, the support structure of the intake chamber 15 of the present invention will be described with reference to FIGS.
As described above, the intake pressure of the engine intake changes intermittently according to the valve opening timing of each cylinder, so that the pressure fluctuation is transmitted to the intake chamber 15. Although it is possible to attach the intake chamber 15 to the engine, many attachment members such as stays are required, and a large attachment space is required to attach the intake chamber having a volume for obtaining a sufficient silencing effect. Maintenance becomes difficult. On the other hand, when the intake chamber is fixed to the upper partition wall 18 or the partition wall, this vibration propagates to the upper partition wall, and the upper partition wall and the casing to which the upper partition wall is connected also vibrate, which causes noise. An air cleaner connected between the intake chamber and the intake port of the engine is usually attached to the engine via a vibration isolator. In addition, the intake pipe connecting the air cleaner and the engine intake port or the air cleaner and the intake chamber is made of an elastic material to prevent vibration transmitted directly, but against vibration caused by changes in intake pressure. Has not been addressed.
[0025]
Therefore, the present invention intends to provide the intake chamber with an anti-vibration mechanism against the pressure change of the intake air. In this embodiment, the intake chamber 15 is attached to the lower surface of the upper partition wall 18 above the engine near the air cleaner. Is also possible.
Since the upper partition 18 forms a duct on the exhaust side, there is an advantage that maintenance, assembly, and the like can be easily performed. Edges 15a and 15a for fixing are protruded laterally on the upper surface of the intake chamber 15, and mounting holes 15b, 15b... Are opened in the edges 15a and 15a. The mounting holes 18a, 18a,... Are also opened on the upper partition wall 18 side so as to correspond to the mounting holes 15b, 15b,.
[0026]
First, a first embodiment of the image stabilization configuration will be described with reference to FIGS.
In order to attach the intake chamber 15 to the lower surface of the upper partition wall 18, a vibration isolator 80 made of an elastic material such as rubber or synthetic rubber is positioned on the attachment holes 15 b and 15 b. A vibration isolator 80 is interposed between the upper partition wall 18. Then, the bolt 81 is disposed through the mounting hole 18a, the vibration isolator 80 and the mounting hole 15b, and is fastened and fixed with nuts 82, 82. The nuts 82, 82,... Are screwed to a bolt as two double nuts to prevent loosening. The vibration isolator 80 is elastically deformed by fastening of the bolt 81 and is brought into close contact with the upper partition wall 18 and the upper plate 15a, thereby exhibiting a vibration isolating effect. Although the present invention seems to increase the manufacturing cost due to an increase in the number of parts, in the conventional method, when noise is generated due to resonance or the like, measures such as increasing the plate thickness or adding reinforcing ribs have been taken. In the present invention, these treatments are not necessary, and the total cost can be reduced.
[0027]
Next, a second embodiment will be described with reference to FIG.
The vibration isolator 84 is formed in a cylindrical shape by an elastic material such as rubber or synthetic rubber, an annular groove 84a is formed in the middle of the upper and lower sides of the cylindrical outer periphery, and a through hole 84b is opened at the central axial position. ing. The groove 84a of the vibration isolator 84 is fitted into the mounting hole 15b of the intake chamber 15, the collar 85 is fitted into the through hole 84b, and the bolt 81 is attached from below to the spring washer 86, flat washer 90, collar 85, flat washer. 90, the spring washer 86 is inserted and screwed and fixed by the nut 82, and the vibration isolator 84 and the mounting hole 18a of the upper partition wall 18 are externally fitted to the collar 85.
The anti-vibration body 84 has a length of the collar 85 so as to have a specified compression allowance for sufficient elasticity, and supports the intake chamber 15 to the casing in a compressed state by tightening the bolt 81. The fastening force is managed and maintained by the collar 85. With this configuration, even if the intake chamber 15 vibrates, the vibration isolator 84 can be elastically deformed so that vibration is not transmitted to the upper partition wall 18. Since the bolts are fastened to the collar 85 that is not deformed, it is not necessary to use a plurality of nuts to prevent loosening as shown in FIGS.
[0028]
Next, a third embodiment will be described with reference to FIG.
The vibration isolator 87 is formed in a cylindrical shape by an elastic material such as rubber or synthetic rubber, and plates 88 having bolts 89 standing on the upper and lower surfaces of the vibration isolator 87 are fixed to each other. Is inserted into the mounting hole 18a and tightened and fixed by the nut 82 via the flat washer 90 and the spring washer 86. The lower bolt 89 is inserted into the mounting hole 15 b and is fastened and fixed by a nut 82 via a flat washer 90 and a spring washer 86. The material of the vibration isolator 87 may be a material capable of attenuating the frequency to be anti-vibrated (for example, a viscoelastic foam made of a specific viscous rubber mixture in which both open cells and closed cells are mixed). As a result, the anti-vibration effect is further enhanced. Further, by configuring the vibration isolator 87 so that the spring constant can be changed according to the anti-vibration frequency, the anti-vibration frequency can be adjusted for each engine for anti-vibration.
[0029]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
[0030]
An air exhaust port 30 is provided in the approximate center of the upper surface of the housing of the power generator 1, an air cleaner 16 is disposed above the engine 11 disposed in the housing of the power generator 1, and an upper partition wall 18 is disposed above the air cleaner 16. The upper partition wall 18 is disposed horizontally between the engine 11 and the exhaust port 30, and noise generated from the engine 11 does not directly go out of the power generator 1 from the exhaust port 30. In the soundproof type power generator configured as described above, the intake chamber 15 is disposed on the lower surface of the upper partition wall 18, and the intake chamber 15 introduces air through the intake pipe 34, and the intake chamber 15 and the air cleaner 16 are connected to each other. It is connected via a pipe, and the air introduced into the air cleaner 16 is supplied to the intake port of the engine 11, and an elastic member is provided between the intake chamber 15 and the upper partition wall 18. Because the isolator 80 made of material interposed, or thickening the plate thickness, without providing a reinforcing rib or the like, that vibration caused by the pulsation of the intake side of the engine is prevented from propagating to the housing The resonance can be prevented and the soundproofing effect can be enhanced at a low cost.
[0031]
In addition, since the intake chamber 15 and the upper partition wall 18 are fixed via the vibration isolator 80, the soundproofing effect is further enhanced. In addition, vibration isolation can be achieved with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a perspective view of a power generation device.
FIG. 2 is a side view showing an internal configuration of the power generation device.
FIG. 3 is a rear view showing the internal configuration of the power generation device.
FIG. 4 is a front view showing a configuration of an opening / closing door.
FIG. 5 is a partially cutaway side view showing the configuration of the door.
FIG. 6 is a view showing an assembly configuration of an opening / closing door.
FIG. 7 is a top view of a conventional upper partition.
FIG. 8 is a side view of a conventional upper partition wall.
FIG. 9 is a front view of a conventional upper partition wall.
FIG. 10 is a view showing a method for mounting and supporting an intake chamber according to the present invention.
FIG. 11 is a diagram showing a first embodiment.
FIG. 12 is a diagram showing a second embodiment.
FIG. 13 is a diagram showing a third embodiment.
[Explanation of symbols]
11 Engine 15 Intake chamber 15a Upper plate 15b Mounting hole 16 Air cleaner 18 Upper partition wall 18a Mounting hole 80/84/87 Vibration isolator 81 Bolt 82 Nut 85 Color 86 Spring washer 90 Flat washer

Claims (1)

An air exhaust port 30 is provided in the approximate center of the upper surface of the housing of the power generation device 1, an air cleaner 16 is disposed above the engine 11 disposed in the housing of the power generation device 1, and an upper partition wall 18 is disposed above the air cleaner 16. The upper partition wall 18 is disposed horizontally between the engine 11 and the exhaust port 30, and noise generated from the engine 11 does not directly go out of the power generator 1 from the exhaust port 30. In the soundproof type power generator configured as described above, the intake chamber 15 is disposed on the lower surface of the upper partition wall 18, and the intake chamber 15 introduces air through the intake pipe 34, and the intake chamber 15 and the air cleaner 16 are connected to each other. It is connected via a pipe, and the air introduced into the air cleaner 16 is supplied to the intake port of the engine 11, and an elastic member is provided between the intake chamber 15 and the upper partition wall 18. Soundproof power generator, characterized in that the isolator 80 made of material interposed.

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