JPH08312482A - Engine drive type generating set - Google Patents

Abstract

PURPOSE: To suppress noises produced as an engine is operated without impairing ventilation in the inside of a main body case, and easy inspection and maintenance with none of the generating set made large in size. CONSTITUTION: The engine drive type generating set 11 is equipped with a main body case 12, a diesel engine 14 mounted in the inside of the main body case, and with a generator 19 which is mounted in the inside of the main body case 12, and driven by the diesel engine 14. A box 20 the lower end of which is opened, is disposed in the inside of the main body case 12. The various types of electric parts 21 are fitted on the inner wall surface 20b of the box 20, and a space 23 is thereby formed in the inside of the box 23. An air intake duct 15 for introducing air to the engine 14 is extended to the lower section of the box 20. A sound suppressor 27 is connected thereto at the halfway of the air intake duct 15, and the sound suppressor 27 is thereby disposed at the space 23 in the inside of the box 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven generator used at a construction site or the like, and more particularly to an engine-driven generator equipped with a muffler for reducing noise generated by the operation of the engine. It relates to a power generator.

[0002]

2. Description of the Related Art Conventionally, engine-driven power generators are often used in construction sites and the like where it is generally difficult to secure a power source. An engine and a generator driven by the engine are arranged in a main body case of this device. In addition, a box that collects and stores electric components such as engine control equipment is attached to the main body case.

In such a power generator, noise such as intake noise generated due to engine operation becomes a problem. Therefore,
For example, Japanese Utility Model Laid-Open No. 56-149061 discloses a technique in which a silencer is arranged in a main body case and an air inlet of an air cleaner is connected to the silencer. According to this technique, the intake noise of the engine is reduced by the silencer.

[0004]

In the above-mentioned prior art, a space for installing the silencer is required in the main body case. However, if a muffler is newly installed in the main body case, the space inside the originally narrow main body case is further narrowed,
Ventilation will not be adequate, and maintenance and inspection will be difficult. Although the above problem can be solved by enlarging the main body case by the space for installing the silencer, there is a problem that the entire power generation device becomes large.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to install a silencer as described above without requiring a special space for installing the silencer. An object of the present invention is to provide an engine-driven power generator that can solve various problems.

[0006]

To achieve the above object, a first invention according to claim 1 is arranged in a main body case, and in a box in which parts for power generation are attached,
A muffler is provided to reduce the noise generated by the operation of the engine.

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. ing.

According to a third aspect of the present invention, in addition to the structure of the second aspect, the silencer is fixed to the inner wall of the box by a fastening member. A fourth invention according to claim 4 is
In addition to the structure of the first aspect of the invention, a ventilation hole is formed in the ceiling of the box.

According to a fifth aspect of the present invention, in addition to the structure of the first aspect of the invention, parts to be mounted in the box are arranged along the wall surface.

[0010]

When the engine-driven power generator according to the first aspect of the invention is in operation, the generator is driven by the engine to generate power. A noise is generated by the operation of the engine, and this noise is reduced by the silencer.

The overall size of the power generator is determined by the body case. The size of the main body case is determined by the respective volumes of the engine, the generator, the box that houses components for power generation, the silencer, and the like. In the first aspect of the invention, the space inside the box is used as a conventional space for storing components and a space for installing the silencer. Therefore, the volume occupied by the silencer and the box in the case is smaller than that in the case where the silencer and the box are arranged at different locations.

[0012] Normally, during the intake stroke of the engine, an intake sound is generated along with the movement of the piston and propagates in the intake pipe. In the second invention, the intake noise is reduced by the silencer arranged in the box.

In the third aspect of the invention, since the relative movement of the muffler and the box is restricted by the fastening member, even if the vibration of the engine or the like is transmitted to the muffler through the intake pipe, the vibration is transmitted to the inner wall of the box. Hard to hit parts.

If the parts for power generation mounted on the box are electric parts, they may generate heat when energized.
In the fourth aspect of the invention, even if the parts generate heat, the heat does not stay in the box and is discharged from the ventilation hole. Therefore, the temperature rise of the parts is suppressed even though the inside of the box is narrowed due to the disposition of the silencer.

In the fifth aspect of the invention, the parts are arranged along the wall surface of the box in the box, so that 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.

The engine-driven power generator 11 is provided with a body case 12 having a substantially rectangular parallelepiped shape elongated in the front-rear direction (left and right in the drawing). A window 13 is provided on the rear surface 12a of the body case 12. A water-cooled diesel engine 14 is installed substantially in the center of the body case 12. The engine 14 includes a combustion chamber (not shown) and an intake pipe 15 for guiding air into the combustion chamber. Intake pipe 1
An air cleaner 16 for catching dust in the air is attached in the middle of 5.

In the engine 14, the air cleaner 16
Clear air from which dust has been separated by passing through the intake pipe 15 is introduced into the combustion chamber through the intake pipe 15, and the piston (not shown)
It is compressed by the reciprocating motion of. Fuel injected from a fuel injection valve (not shown) is mixed with compressed air and self-ignites and burns. The piston reciprocates due to the thermal energy accompanying the combustion, and the reciprocating motion is converted into 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 in the intake pipe 15.

At the front of the body case 12, the engine 1
A radiator 17 for cooling the cooling water which has passed through the inside of the tank 4 and has become high temperature is arranged. The engine 14 includes a fan 18 forcibly supplying the cooling air required for heat radiation from the radiator 17. A generator 19 is installed in the rear part of the main body case 12. The generator 19 is drivingly connected to the crankshaft of the engine 14 and operates in accordance with the rotation of the crankshaft to generate electric power.

A metal box 20 is arranged above the generator 19 in the rear portion of the main body case 12. The box 20 has a rectangular box shape with an open lower end,
The rear surface 20a is exposed at the window portion 13 of the main body case 12. A large number of electric components 21 such as a control device are attached to the inner wall surface 20b of the box 20. The cables 22 connected to the respective electric components 21 are bundled, hung down along the inner wall surface 20b, and led out from the lower end opening 20d of the box 20. By mounting the various electric components 21 on the inner wall surface 20b in this way, a space 23 is formed inside the box 20.

A switch 24 for starting / stopping the engine 14 and a meter 25 for indicating operating conditions such as engine speed, oil pressure, power generation frequency, etc. are mounted on the rear surface 20a of the box 20. The operator can operate the switch 24 and visually recognize the meter 25 from the outside of the main body case 12. Further, the ceiling portion 20c of the box 20 is provided with a large number of vent holes 26 for allowing the heat of the electric component 21 to escape.

In the intake pipe 15, an air cleaner 16
The upstream portion of the box 20 is composed of a hose made of rubber, synthetic resin, etc.
Is extended to just below the lower end opening 20d. Intake pipe 1
A resonance type silencer 27 is connected to 5. The muffler 27 applies the Helmholtz resonance principle, and includes a resonance box 28 having a predetermined volume, and a resonance tube 29 that connects the resonance box 28 and the intake pipe 15 to each other.
The silencer 27 reduces the predetermined frequency component (low frequency component in this case) of the intake sound of the engine 14 by the resonance action of the resonance tube 29 and the resonance box 28.

The resonance box 28, which occupies most of the silencer 27, is arranged in the space 23 in the box 20. The resonance box 28 is fixed to the box 20 using bolts 30 as fastening members. More specifically, a boss portion 31 is formed on the upper portion of the resonance box 28, and the bolt 3 inserted from above the box 20 into the ceiling portion 20c.
0 is screwed into the boss portion 31.

During operation of the engine-driven generator 11 having the above-described structure, the generator 19 is driven by the engine 14 to generate electricity. During the intake stroke of the engine 14, an intake noise is generated along with the movement of the piston and propagates in the intake pipe 15. However, this intake sound is reduced by the resonance action of the silencer 27 arranged in the box 20.

By the way, the overall size of the power generator 11 is determined by the 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 accommodating the electric components 21, the silencer 27, and the like. In this embodiment, the electric component 21 is attached to the inner wall surface 20 b of the box 20 to form a space 23 in the box 20. And
A silencer 27 is arranged in this space 23. That is, the space 23 inside the box 20 for housing the electric component 21 is used as a space for installing the silencer 27. Therefore, the volume occupied by both the silencer 27 and the box 20 in the main body case 12 is smaller than that in the case where the silencer 27 and the box 20 are arranged at different locations.

Therefore, even though the silencer 27 is installed in the main body case 12, the space in the case 12 is not narrowed, and the ventilation of the radiator 17 etc. is sufficiently accompanied by the installation of the silencer 27. Will not be done in
It can solve the conventional problems that maintenance and inspection become difficult. Since it is not necessary to enlarge the main body case 12 for installing the silencer 27, it is possible to avoid an increase in size of the entire power generation device 11.

Further, since the muffler 27 is fixed to the ceiling portion 20c of the box 20 by the bolt 30, even if the vibration of the engine 14 or the like is transmitted to the muffler 27 through the intake pipe 15, it is still transmitted to the box 20. Inner wall surface 20
b, the electric component 21, the cable 22 and the like are suppressed.

Further, by disposing the electric component 21 along the wall surface of the box 20, it is possible to secure a wide space in the central portion of the box 20. For this reason, particularly in the important requirements (capacity, diameter, length) that determine the performance of the silencer, it becomes easy to mount the silencer 27 having a large diameter.

Electrical components 21 mounted on the box 20
May generate heat when energized. However, even if the electric component 21 generates heat in this way, the heat does not stay in the box 20 and is discharged from the vent hole 26. For this reason, even though the inside of the box 20 is narrowed by the arrangement of the silencer 27, it is possible to prevent the temperature rise of the electric components 21 and prevent their operation from becoming unstable. (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG.

In the present embodiment, a cylindrical partition member 32 whose upper and lower ends are open is arranged 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 electric component 21 and the cable 22 are arranged outside the partition member 32, and the resonance box 28 of the silencer 27 is housed in the partition member 32. Since other configurations are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

Therefore, according to this embodiment, as in the first embodiment, the air permeability in the main body case 12 and the ease of maintenance / inspection are not impaired, and the entire power generator 11 is not enlarged. The intake noise of the engine 14 can be reduced.

Further, the inside of the box 20 is a partition member 32.
It is divided into two spaces by. Partition member 32
During the assembling work of the power generation device 11, the box 2
When arranging the silencer 27 in 0, interference with the silencer 27 and the cable 22 etc. is prevented. Therefore, the silencer 27
Can be easily inserted into the box 20, and the assembling work can be performed easily. (Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, a cavity type (expansion type) silencer 33 is used in place of the resonance type. For more details,
In the intake pipe 15, a portion 1 upstream of the air cleaner 16
5a extends in the horizontal direction and penetrates the front wall 20e of the box 20. The upstream portion 15a changes its direction to a vertical direction inside the box 20. And the upstream portion 15a
The open end of is an air suction port 15b.

A box having an expansion chamber 33a is provided in the middle of the upstream portion 15a. This box constitutes the muffler 33, is arranged in the space 23 in the box 20, and is fastened and fixed to the ceiling portion 20 c by the bolt 30. In this type of silencer 33, the intake noise is
The volume change when propagating from 5 to the expansion chamber 33a or the volume change when propagating from the expansion chamber 33a to the suction port 15b is used to interfere the intake sounds with each other to reduce the predetermined frequency component. Since the configuration other than the above is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

Therefore, according to the present embodiment, although the principle of silencing is different from that of the resonance type silencer 27, in the same manner as in the first embodiment, the ventilation in the main body case 12 and the ease of maintenance and inspection are improved. The intake sound of the engine 14 can be reduced without damaging or increasing the size of the power generation device 11 as a whole.

Further, in this embodiment, since the upstream portion 15a of the intake pipe 15 is inserted into and supported by the box 20, the movement of the upstream portion 15a is restricted. Therefore, even if the vibration of the engine 14 is transmitted to the intake pipe 15 and the muffler 33, they are more reliably prevented from hitting the inner wall surface 20b of the box 20, the electric component 21, the cable 22 and the like and interfering with each other. (Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG.

This embodiment is largely 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 muffler 27 is arranged in the space 23 in the box 20 and is composed of a resonance box 28 fixed to the ceiling portion 20c by a bolt 30 and a resonance tube 29 hanging downward from the resonance box 28. . The resonance tube 29 communicates the inside and outside of the box 20. The muffler 27 reduces the sound (intake sound, exhaust sound, etc.) generated by the operation of the engine 14 and amplified in the space inside the main body case 12 by the resonance action. Since the configuration other than the above is the same as that of the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

Therefore, according to the present embodiment, the target of noise reduction is replaced by the sound in the main body case 12 from the intake sound, but like the first embodiment, the air permeability in the main body case 12 and the ease of maintenance and inspection are easy. The sound can be reduced without impairing the soundness and without enlarging the entire power generation device 11. (Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG.

In the present embodiment, a tubular member 34 whose upper and lower ends are opened is arranged in the space 23 inside the box 20, and the upper end of the tubular 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 tubular member 34. Fixing the tubular member 34 to the ceiling portion 20c,
And fixing the bottom plate 36 to the tubular member 34 by welding,
Means such as bolts can be used. A resonance box 37 is configured by a part of the ceiling portion 20c, the tubular member 34, and the bottom plate 36. A resonance pipe 38 having an open upper end branches from the intake pipe 15, and its upper end is inserted into the hole 35 of the bottom plate 36 without any gap. Further, the resonance box 37 and the resonance tube 38 constitute a silencer 39. Since other configurations are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

Therefore, according to this embodiment, the intake noise of the engine 14 can be reduced by a simpler structure in addition to the same operation and effect as those of the first embodiment. 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 effectively used correspondingly, and the silencer 39 can be formed with a small amount of material.

Further, the box 20 and the resonance box 37 are manufactured as one assembly, and then the hole 3 of the bottom plate 36 is formed.
The silencer 39 can be formed by inserting the resonance tube 38 into the filter 5. Therefore, as compared with the case where the silencer 27 is provided in advance on the intake pipe 15 side and the silencer 27 is housed in the box 20 and fastened (first embodiment), the assembling work can be performed easily.

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 wall of the box 20. For example, instead of the ceiling portion 20c, the muffler 2 is provided on the side wall.
You may fix 7,33.

(2) The shape of the resonance box 28 in the muffler 27 and the shape of the expansion chamber 33a in the muffler 33 may be changed appropriately. Although the respective embodiments of the present invention have been described above, technical ideas other than the claims that can be understood from the respective embodiments will be described below together with their effects.

(A) In the power generator according to the first aspect, the silencer comprises a resonance box having a predetermined volume and a resonance tube projecting from the resonance box and opening into a space inside the main body case. Engine driven power generator. With such a configuration, the sound generated with the operation of the engine and amplified in the space inside the main body case can be reduced by the resonance action of the silencer.

(B) The power generator according to claim 2, wherein the silencer comprises a resonance box having a predetermined volume, and a resonance tube communicating between the resonance box and the intake pipe. With this configuration,
The intake sound that is generated as the engine operates and propagates in the intake pipe can be reduced by the resonance action of the silencer.

(C) In the power generator according to claim 2, the silencer is an engine drive type which is provided in the middle of the intake pipe and is constituted by a box having an expansion chamber arranged in the box. Power generator. With such a configuration, the intake sound that is generated with the operation of the engine and propagates in the intake pipe can be reduced by the volume change in the expansion chamber.

(D) The engine-driven power generator according to claim 1, wherein a partition member is provided between the silencer and the power generating component in the box. With such a configuration, when the power generator is assembled, the silencer can be arranged in the box without interfering with the parts, and the assembling work becomes easy.

[0048]

As described above in detail, according to the first aspect of the invention, the space inside the box is used as a conventional space for storing parts and a space for installing the silencer. For this reason, the breathability in the main body case and the ease of maintenance and inspection may be impaired,
It is possible to reduce the noise generated by the operation of the engine without increasing the size of the entire power generation device.

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 with the operation of the engine and propagates in the intake pipe. According to the third invention, in addition to the effect of the second invention, even if the vibration of the engine or the like is transmitted to the silencer via the intake pipe, it is possible to suppress the interference with the inner wall of the box, the parts and the like.

According to the fourth invention, in addition to the effect of the first invention, even if the component for power generation generates heat, the heat can be released from the ventilation hole to the outside of the box. Therefore, the temperature rise of the parts can be suppressed even though the inside of the box is narrowed due to the disposition of the silencer.

According to the fifth invention, in addition to the effect of the first invention, a wide space for disposing the silencer can be secured near the center of the box.

[Brief description of drawings]

FIG. 1 is a sectional view of an engine-driven power generator according to a first embodiment.

FIG. 2 is a sectional view showing the internal structure of the box in the second embodiment.

FIG. 3 is a sectional view showing the internal structure of the box in the third embodiment.

FIG. 4 is a sectional view showing the internal structure of a box in a fourth embodiment.

FIG. 5 is a sectional view showing an internal structure of a box in a fifth embodiment.

[Explanation of symbols]

11 ... Engine driven power generator, 12 ... Main body case, 1
4 ... Diesel engine, 15 ... Intake pipe, 19 ... Generator, 20 ... Box, 20b ... Inner wall surface, 20c ... Ceiling part, 21 ... Electric parts as parts for power generation, 26 ...
Vents, 27, 33, 39 ... Silencer, 30 ... Bolts as fastening members.

Claims (5)

[Claims] 1. An engine-driven power generator including a main body case, an engine arranged in the main body case, and a generator arranged in the main body case and driven by the engine. An engine-driven power generator in which a silencer for reducing noise generated due to the operation of the engine is disposed in a box that is disposed in the main body case and has a component for power generation attached thereto. 2. 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. 3. The engine-driven power generator according to claim 2, wherein the silencer is fixed to the inner wall of the box by a fastening member. 4. The engine driven power generator according to claim 1, wherein a ventilation hole is formed in a ceiling portion of the box. 5. The engine-driven power generator according to claim 1, wherein components mounted in the box are arranged along a wall surface.