JP3620095B2 - Engine-driven power generator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an engine-driven power generator used at a construction site or the like, and more particularly to an engine-driven power generator equipped with a silencer for reducing sound generated as the engine operates.
[0002]
[Prior art]
Conventionally, engine-driven power generators are often used in construction sites where it is generally difficult to secure a power source. An engine and a generator driven by the engine are arranged in the main body case of the apparatus. In addition, a box that collects and stores electrical components such as engine control devices is attached to the main body case.
[0003]
In such a power generation device, there is a problem with sounds such as intake noise generated based on the operation of the engine. Thus, for example, Japanese Utility Model Publication No. 56-149061 discloses a technique in which a silencer is disposed in a main body case and an air inlet of an air cleaner is connected thereto. According to this technique, the intake sound of the engine is reduced by the silencer.
[0004]
[Problems to be solved by the invention]
In the prior art, an installation space for the silencer is required in the main body case. However, if a silencer is newly installed in the main body case, the space in the narrow main body case will be further narrowed, and ventilation will not be performed sufficiently, and maintenance and inspection will be difficult. If the main body case is enlarged by an amount corresponding to the installation space of the silencer, the above-mentioned problem can be solved, but there arises a problem that the entire power generation device is enlarged.
[0005]
The present invention has been made in view of the above-described circumstances, and its purpose is not to secure a special space for installing the silencer, and various problems associated with the installation of the silencer as described above. It is an object to provide an engine-driven power generation device that can eliminate the problem.
[0006]
[Means for Solving the Problems]
The first invention of claim 1 in order to achieve the object is disposed in the main body case, and in a box mounted electric unit product of the control apparatus, reduce the noise generated with the operation of the engine A silencer is provided for this purpose.
[0007]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the engine includes an intake pipe extending to the vicinity of the box, and the silencer is connected to the intake pipe.
[0008]
According to a third aspect of the present invention, in addition to the configuration of the second aspect, the silencer is fixed to the inner wall of the box by a fastening member.
According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, a vent hole is formed in the ceiling portion of the box.
[0009]
According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the invention, the electrical components attached in the box are arranged along the wall surface.
[0010]
[Action]
During operation of the engine-driven power generator according to the first aspect of the invention, the generator is driven by the engine to generate power. A sound is generated as the engine operates, and this sound is reduced by the silencer.
[0011]
The overall size of the power generator is determined by the main body case. The size of the main body case, the engine, the generator, the box electrical part article mounted control device, is determined by each of the volume of the silencer or the like. In the first aspect of the invention, the space in the box is used both for storing electrical parts as usual and for installing the silencer. For this reason, compared with the case where a silencer and a box are arrange | positioned in a different location, the volume which both occupy in a case becomes small.
[0012]
Usually, during the intake stroke of the engine, an intake noise is generated with the movement of the piston and propagates through the intake pipe. In the second invention, the intake sound is reduced by a silencer disposed in the box.
[0013]
In the third invention, since the relative movement between the silencer and the box is regulated by the fastening member, even if the vibration of the engine or the like is transmitted to the silencer via the intake pipe, this is the inner wall of the box, the electrical parts, etc. It is hard to hit.
[0014]
Electrical unit goods mounted control device in the box may be heated by energization. In the fourth invention, even if the electric component generates heat, the heat does not stay in the box and is released from the vent hole. For this reason, although the inside of a box becomes narrow by arrangement | positioning of a silencer, the temperature rise of the said electrical component is suppressed.
[0015]
In the fifth invention, by arranging the electrical components along the wall surface of the box in the box, a wide space for disposing the silencer is formed near the center of the box.
[0016]
【Example】
(First embodiment)
A first embodiment of the present invention will be described below with reference to FIG.
[0017]
The engine-driven power generator 11 includes a substantially rectangular parallelepiped main body case 12 that is elongated in the front-rear direction (left and right in the drawing). A window portion 13 is provided on the rear surface 12 a of the main body case 12. A water-cooled diesel engine 14 is installed almost at the center in the main body case 12. The engine 14 includes a combustion chamber (not shown) and an intake pipe 15 for guiding air to the combustion chamber. An air cleaner 16 for capturing dust in the air is attached in the middle of the intake pipe 15.
[0018]
In the engine 14, the clear air from which dust is separated by passing through the air cleaner 16 is guided to the combustion chamber through the intake pipe 15, and is compressed by the reciprocating motion of a piston (not shown). Fuel injected from a fuel injection valve (not shown) is mixed with compressed air, self-ignited and burned. The piston is reciprocated by the thermal energy accompanying combustion, and the reciprocating motion is converted into a rotational motion and transmitted to the crankshaft. During the intake stroke of the engine 14, an intake noise is generated along with the movement of the piston and propagates through the intake pipe 15.
[0019]
A radiator 17 for cooling the cooling water that has passed through the engine 14 and has reached a high temperature is disposed in the front portion of the main body case 12. The engine 14 includes a fan 18 that forcibly supplies cooling air necessary for heat radiation from the radiator 17. A generator 19 is installed at the rear of the main body case 12. The generator 19 is drivingly connected to the crankshaft of the engine 14, and operates to generate electric power as the crankshaft rotates.
[0020]
A metal box 20 is disposed above the generator 19 in the rear part of the main body case 12. The box 20 has a square box shape with the lower end opened, and the rear surface 20 a is exposed at the window portion 13 of the main body case 12. A large number of electrical components 21 such as control devices are attached to the inner wall surface 20 b of the box 20. The cables 22 connected to the respective electric components 21 are bundled, suspended along the inner wall surface 20b, and led out from the lower end opening 20d of the box 20. Thus, the various electric components 21 are attached to the inner wall surface 20 b, thereby forming a space 23 inside the box 20.
[0021]
On the rear surface 20a of the box 20, a switch 24 for starting / stopping the engine 14 and a meter 25 indicating an operation state such as engine speed, hydraulic pressure, power generation frequency and the like are attached. An operator can operate the switch 24 from the outside of the main body case 12 or visually check the meter 25. The ceiling 20c of the box 20 is provided with a large number of ventilation holes 26 for releasing the heat of the electrical component 21.
[0022]
A portion of the intake pipe 15 upstream of the air cleaner 16 is constituted by a hose made of rubber, synthetic resin or the like, and extends along the generator 19 to a position directly below the lower end opening 20d of the box 20. A resonance silencer 27 is connected to the intake pipe 15. The silencer 27 is an application of the Helmholtz resonance principle, and includes a resonance box 28 having a predetermined volume and a resonance pipe 29 that allows the resonance box 28 and the intake pipe 15 to communicate with each other. The silencer 27 reduces a predetermined frequency component (in this case, a low frequency component) of the intake sound of the engine 14 by the resonance action of the resonance tube 29 and the resonance box 28.
[0023]
A resonance box 28 occupying most of the silencer 27 is disposed in the space 23 in the box 20. The resonance box 28 is fixed to the box 20 using a bolt 30 as a fastening member. More specifically, a boss portion 31 is formed on the upper portion of the resonance box 28, and a bolt 30 inserted from above the box 20 into the ceiling portion 20 c is screwed into the boss portion 31.
[0024]
During operation of the engine-driven power generator 11 configured as described above, the generator 19 is driven by the engine 14 to generate power. During the intake stroke of the engine 14, an intake noise is generated along with the movement of the piston and propagates through the intake pipe 15. However, this intake sound is reduced by the resonance effect of the silencer 27 disposed in the box 20.
[0025]
By the way, the overall size of the power generator 11 is determined by the main body case 12. The size of the main body case 12 is determined by the respective volumes of the engine 14, the generator 19, the box 20 that houses the electrical components 21, the silencer 27, and the like. In this embodiment, the electrical component 21 is attached to the inner wall surface 20 b of the box 20, so that a space 23 is formed in the box 20. A silencer 27 is disposed in the space 23. That is, a space 23 inside the box 20 for storing the electrical component 21 is used as an installation space for the silencer 27. For this reason, compared with the case where the silencer 27 and the box 20 are arrange | positioned in a different location, the volume which both 27 and 20 occupy in the main body case 12 becomes small.
[0026]
Therefore, although the silencer 27 is installed in the main body case 12, the space in the case 12 is not reduced, and the radiator 17 and the like are sufficiently ventilated with the installation of the silencer 27. It can solve the conventional problems that are lost or that makes maintenance and inspection difficult. Since it is not necessary to enlarge the main body case 12 for the installation of the silencer 27, it is possible to avoid an increase in the size of the entire power generation apparatus 11.
[0027]
Further, since the silencer 27 is fixed to the ceiling portion 20c of the box 20 by the bolt 30, even if vibration of the engine 14 or the like is transmitted to the silencer 27 via the intake pipe 15, this is the inner wall surface of the box 20. 20b, the electric component 21, the cable 22, etc. are suppressed.
[0028]
In addition, by disposing the electrical component 21 along the wall surface of the box 20, a wide space can be secured in the central portion of the box 20. For this reason, it is easy to mount the silencer 27 having a large diameter, particularly in the important requirements (capacity, diameter, length) that determine the performance of the silencer.
[0029]
The electrical component 21 attached to the box 20 may generate heat when energized. However, even if the electrical component 21 generates heat in this way, the heat does not stay in the box 20 and is released from the vent hole 26. For this reason, although the inside of the box 20 becomes narrow by arrangement | positioning of the silencer 27, the temperature rise of the electrical component 21 is suppressed and it can prevent that those operation | movement becomes unstable.
(Second embodiment)
Next, a second embodiment embodying the present invention will be described with reference to FIG.
[0030]
In the present embodiment, a cylindrical partition member 32 having open upper and lower ends is disposed in the box 20. The upper end of the partition member 32 is fixed to the ceiling portion 20c of the box 20 by means such as welding. The electrical component 21 and the cable 22 are disposed outside the partition member 32, and the resonance box 28 of the silencer 27 is accommodated in the partition member 32. Since the other configuration is the same as that of the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted.
[0031]
Therefore, according to the present embodiment, as in the first embodiment, the engine 14 is not damaged without impairing the air permeability in the main body case 12 and the ease of maintenance and inspection, and without enlarging the entire power generation device 11. Inhalation noise can be reduced.
[0032]
Further, the inside of the box 20 is partitioned into two spaces by a partition member 32. The partition member 32 prevents interference between the silencer 27 and the cable 22 and the like when the silencer 27 is disposed in the box 20 during the assembly work of the power generation apparatus 11. For this reason, the silencer 27 can be easily inserted into the box 20 and the assembly work can be easily performed.
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.
[0033]
In this embodiment, a cavity type (expanding type) silencer 33 is used instead of the resonance type. More specifically, the upstream portion 15 a of the intake pipe 15 from the air cleaner 16 extends in the horizontal direction and penetrates the front wall 20 e of the box 20. The upstream portion 15 a changes its direction in the box 20 to the vertical direction. The open end of the upstream portion 15a serves as an air inlet 15b.
[0034]
A box having an expansion chamber 33a is provided in the middle of the upstream portion 15a. This box constitutes the silencer 33, is arranged in the space 23 in the box 20, and is fastened and fixed to the ceiling portion 20 c by bolts 30. This type of silencer 33 utilizes the volume change when the intake sound is propagated from the intake pipe 15 to the expansion chamber 33a or the volume change when the intake sound is propagated from the expansion chamber 33a to the suction port 15b. The predetermined frequency component is reduced by interference. Since the configuration other than the above is the same as that of the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted.
[0035]
Therefore, according to the present embodiment, although the principle of silencing is different from that of the resonance-type silencer 27, the air permeability in the main body case 12 and the ease of maintenance / inspection are impaired as in the first embodiment. The intake noise of the engine 14 can be reduced without enlarging the entire power generation device 11.
[0036]
Further, in this embodiment, the upstream portion 15a of the intake pipe 15 is inserted and supported by the box 20, so that the movement of the upstream portion 15a is restricted. For this reason, even if the vibration of the engine 14 is transmitted to the intake pipe 15 and the silencer 33, they are more reliably prevented from colliding with each other by hitting the inner wall surface 20 b of the box 20, the electrical component 21, the cable 22, and the like.
(Fourth embodiment)
Next, a fourth embodiment embodying the present invention will be described with reference to FIG.
[0037]
This embodiment is greatly different from the first embodiment in that the resonance silencer 27 is not connected to the intake pipe 15 of the engine 14. That is, the silencer 27 includes a resonance box 28 that is disposed in the space 23 in the box 20 and is fixed to the ceiling portion 20c by a bolt 30, and a resonance tube 29 that hangs downward from the resonance box 28. . The resonance tube 29 communicates the inside and outside of the box 20. The silencer 27 reduces the sound (intake sound, exhaust sound, etc.) generated in response to the operation of the engine 14 and amplified in the space inside the main body case 12 by resonance. Since the configuration other than the above is the same as that of the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted.
[0038]
Therefore, according to the present embodiment, although the object of mute replaces the sound in the main body case 12 from the intake sound, the air permeability in the main body case 12 and the ease of maintenance and inspection are impaired as in the first embodiment. Or the sound can be reduced without enlarging the entire power generation device 11.
(5th Example)
Next, a fifth embodiment of the present invention will be described with reference to FIG.
[0039]
In the present embodiment, a cylindrical member 34 whose upper and lower ends are open is disposed in the space 23 in the box 20, and the upper end of the cylindrical member 34 is fixed to the ceiling portion 20c. A bottom plate 36 having a hole 35 is fixed to the lower end of the cylindrical member 34. For fixing the cylindrical member 34 to the ceiling portion 20c and fixing the bottom plate 36 to the cylindrical member 34, means such as welding and bolts can be used. A resonance box 37 is constituted by a part of the ceiling portion 20c, the cylindrical member 34, and the bottom plate 36. A resonance pipe 38 having an open upper end is branched from the intake pipe 15, and the upper end portion is inserted into the hole 35 of the bottom plate 36 without a gap. The resonance box 37 and the resonance tube 38 constitute a silencer 39. Since the other configuration is the same as that of the first embodiment, the same members are denoted by the same reference numerals and description thereof is omitted.
[0040]
Therefore, according to the present embodiment, in addition to the same operations and effects as the first embodiment, the intake noise of the engine 14 can be reduced with a simpler structure. That is, since the ceiling portion 20c of the box 20 also serves as a part of the resonance box 37, the space 23 in the box 20 can be used effectively, and the silencer 39 can be formed with a small amount of material.
[0041]
Further, the silencer 39 can be formed by manufacturing the box 20 and the resonance box 37 as one assembly and then inserting the resonance tube 38 through the hole 35 of the bottom plate 36. For this reason, as compared with the case where the silencer 27 is provided on the intake pipe 15 side in advance and the silencer 27 is accommodated in the box 20 and fastened (first embodiment), the assembly work can be performed easily.
[0042]
The present invention can be embodied in another embodiment shown below.
(1) The fixing positions of the silencers 27 and 33 with respect to the box 20 are not particularly limited as long as they are the inner walls of the box 20. For example, the silencers 27 and 33 may be fixed to the side wall instead of the ceiling portion 20c.
[0043]
(2) The shape of the resonance box 28 in the silencer 27 and the shape of the expansion chamber 33a in the silencer 33 may be changed as appropriate.
Although the embodiments of the present invention have been described above, technical ideas other than the claims that can be grasped from the embodiments will be described below together with their effects.
[0044]
(A) In the power generator according to claim 1, the silencer is an engine-driven type comprising a resonance box having a predetermined volume and a resonance tube projecting from the resonance box and opening into a space in the main body case. Power generation device. By adopting such a configuration, it is possible to reduce the sound generated with the operation of the engine and amplified in the space inside the main body case by the resonance action of the silencer.
[0045]
(B) The power generation apparatus according to claim 2, wherein the silencer includes a resonance box having a predetermined volume and a resonance pipe communicating between the resonance box and the intake pipe. By adopting such a configuration, it is possible to reduce the intake sound that is generated along with the operation of the engine and propagates in the intake pipe by the resonance action of the silencer.
[0046]
(C) The power generator according to claim 2, wherein the silencer is provided in the middle of the intake pipe and is arranged in the box and is configured by a box having an expansion chamber. By adopting such a configuration, it is possible to reduce the intake noise that is generated along with the operation of the engine and propagates through the intake pipe due to the volume change in the expansion chamber.
[0047]
(D) The power generation apparatus according to claim 1, the engine-driven power generator disposed a partition member between the electric part products and silencer control equipment in the box. With such a configuration, the silencer can be arranged in the box without interfering with the electric parts when the power generation apparatus is assembled, and the assembling work is facilitated.
[0048]
【The invention's effect】
As described above in detail, according to the first invention, the space in the box is used both for storing electrical parts and for installing a silencer as in the conventional case. For this reason, it is possible to reduce the sound generated by the operation of the engine without impairing the air permeability in the main body case and the ease of maintenance and inspection or enlarging the entire power generation device.
[0049]
According to the second invention, in addition to the effect of the first invention, it is possible to effectively reduce the intake noise that is generated in accordance with the operation of the engine and propagates through the intake pipe.
According to the third invention, in addition to the effects of the second invention, even if the vibration of the engine or the like is transmitted to the silencer via the intake pipe, it can be suppressed from colliding with the inner wall of the box, electric parts, etc. .
[0050]
According to the fourth invention, in addition to the effects of the first invention, even if the electrical part article exotherm control devices, it is possible to release its heat from the vent to the box outside. For this reason, although the inside of a box becomes narrow by arrangement | positioning of a silencer, the temperature rise of an electrical component can be suppressed.
[0051]
According to the fifth aspect, in addition to the effect of the first aspect, a wide space for disposing the silencer can be secured near the center in the box.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an engine-driven power generator according to a first embodiment.
FIG. 2 is a cross-sectional view showing an internal structure of a box according to a second embodiment.
FIG. 3 is a cross-sectional view showing an internal structure of a box according to a third embodiment.
FIG. 4 is a cross-sectional view showing the internal structure of a box according to a fourth embodiment.
FIG. 5 is a cross-sectional view showing an internal structure of a box according to a fifth embodiment.
[Explanation of symbols]
11 ... engine-driven power generation apparatus, 12 ... main body case 14 ... diesel engine, 15 ... intake pipe, 19 ... generator, 20 ... box, 20b ... inner wall surface, 20c ... ceiling, 21 ... electrical components of the control device , 26 ... vent holes, 27, 33, 39 ... silencers, 30 ... bolts as fastening members.

Claims (5)

A body case,
An engine disposed in the body case;
In an engine-driven power generator provided with a generator disposed in the main body case and driven by the engine,
Wherein disposed within the body case, and the electric part article mounting within the box of the control equipment, silencers engine-driven power generation apparatus disposed to reduce the noise generated with the operation of the engine. The engine-driven power generator according to claim 1, wherein the engine includes an intake pipe extending to the vicinity of the box, and the silencer is connected to the intake pipe. The engine-driven power generator according to claim 2, wherein the silencer is fixed to an inner wall of the box by a fastening member. The engine-driven power generator according to claim 1, wherein a ventilation hole is formed in a ceiling portion of the box. The engine-driven power generator according to claim 1, wherein the electric component mounted in the box is disposed along a wall surface.

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