JPH0232836Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a soundproof engine work system in which an engine and work equipment such as a generator and a compressor that are operated using the engine as a power source are housed in a soundproof box. It's about machines.

Prior Art Engine working machines that integrate an engine and a generator, compressor, etc. driven by the engine are generally used at construction sites, etc.
In order to keep the operating noise as low as possible, in consideration of the working environment or the local community especially when driving at night in urban areas, many devices are used that have a soundproof structure in which the entire device is covered with a soundproof box.

In this type of soundproof engine working machine, in order to pursue quietness as mentioned above, openings such as intake ports and exhaust ports are made as small and as small as possible, but on the other hand, the opening area is small. Therefore, sufficient consideration must be given to cooling the inside of the soundproof box.

Problems that the invention aims to solve: When the temperature inside the soundproof box increases, the efficiency of the work equipment decreases (i.e., if the work equipment is a generator, the driven torque increases and the load on the engine increases. (increases), and the engine's intake air weight decreases, resulting in a decrease in output. Therefore, it is necessary to constantly supply low-temperature outside air to the engine in order to stabilize the output.

In response to this problem, we fixed the engine air purifier in a position where it can draw in outside air directly, avoiding the engine compartment of the soundproof box, while also preventing intake noise or vibration noise from leaking to the outside. The structure that prevents this is shown in Utility Model Publication No. 55-22184 and Utility Model Publication No. 52-
It is shown in Publication No. 52117.

However, in the structures shown in both publications, the arrangement of the air purifier with respect to the soundproof box body must be determined by taking into account the vibration differences between various parts caused by engine operation, which complicates the device structure. Otherwise, the assembly work becomes complicated.

Means and Effects for Solving the Problems The present invention relates to the improvement of a soundproof engine working machine, in which the working machine and the engine that drives the working machine are housed in a soundproof box, and the bottom of the soundproof box has a vibration-proof In the soundproof engine working machine, the cylinder of the engine is tilted laterally along a plane perpendicular to the rotational axis, and a carburetor and an air purifier are arranged near the top of the engine. , forming a plurality of outside air inlets at the bottom of the soundproof box;
A cylindrical air guide that opens from one of the plurality of outside air inlets to the vicinity of the intake port of the air cleaner is fixed to the bottom, and is connected to the air intake port of the air cleaner and the guide. This is characterized in that the opening of the air guide is spaced apart from and facing the opening of the air guide.

In this invention, as mentioned above, the work equipment and engine are housed in a soundproof box, and the air purifier at the top of the slanted cylinder head is placed at a relatively low height, while outside air is introduced at the bottom of the soundproof box. 1 in the mouth
Since the intake port of the air purifier is open toward the opening of the cylindrical air guide that communicates with the outside air inlet, multiple air can be introduced into the soundproof box. Of the outside air that is taken in through the mouth, most of the low-temperature outside air that is taken in through the outside air inlet to which the cylindrical air guide is fixed is almost mixed with the hot air that remains inside the soundproof box. The air is sufficiently supplied to the air purifier without any air pollution.

In addition, the intake port of the air purifier and the opening of the cylindrical air guide are placed apart, so the air purifier is installed inside the vibration system on the engine side, and the cylindrical air guide is placed in a soundproof box. Even though the air purifier is fixedly installed at the bottom of the air purifier, the suction power of the air purifier allows the air to be sucked in through the intake port without being adversely affected by the difference in the vibration systems of the two.

Furthermore, because of this separation, even when the engine is stopped and immediately after, outside air leaks from the separated area into the soundproof box due to natural convection, so this outside air inlet is used for cooling and ventilation. be able to.

Embodiment Hereinafter, an embodiment of the present invention shown in FIGS. 1 to 5 will be described.

FIG. 1 shows the external appearance of a soundproof engine working machine 10 as a perspective view. Inside the soundproof box body 12, an engine, a working machine (in this embodiment, a generator), and accompanying equipment are shown. Contains equipment to be used. A sound insulating material made of grouse wool or the like, for example, is attached to the inner surface of the soundproof box 12 so that the noise generated by the internal equipment does not leak to the outside.

The soundproof box body 12 includes a bottom wall body 14 and a bottom wall body 14.
It is formed of a main wall 16 having a U-shaped cross section fixed with screws or the like along the side edge of the main wall 16, and an end wall 18 covering both ends of the main wall 16. A single outside air inlet 20, four outside air inlets 22, and a single outside air inlet 24 are formed, and the outside air inlet 2
0 and a pair of outside air inlets 22 from below, and a grooved member 28 that covers the other pair of outside air inlets 22 from below.
6, 28, each pair of moving wheels 3
0 is placed. Then, on the upper surface of the bottom wall body 14, extending upward from the peripheral edge of the outside air inlet 20,
A guide cylinder 21 is provided upright, reaching a position slightly lower than an intake port 44 of an air purifier 42 located near the top of the engine 40.

Further, the bottom wall body 14 has a pair of parallel raised walls 15 on its upper surface side, which function as strength members, and the engine 40 and the generator 80 are connected to the raised walls 15 via a cushioning rubber 32. Fixed.

Therefore, the engine 40 is arranged in an inclined position with its head lowered, as shown in FIG. A fuel tank 70 is installed on both side walls 1 above the engine 40.
It is placed on a partition wall 34 constructed and fixed between 7,
It is fixed with screws. Also, engine 4
0 is covered with a cover 48, and a cooling fan 50 is disposed inside the cover 48 and pivoted to the outer end of the crankshaft. The cover 48 is connected to a shroud 52 that covers the cylinder portion of the engine 40, and the shroud 52 extends toward the end wall body 18 side where the generator 80 is located, and has a muffler 62 therein.
The exhaust pipe duct 54 is secretly connected to the exhaust pipe duct 54 in which the exhaust pipe is housed. This exhaust pipe duct 54 has an end wall body 18
An exhaust window 19 is formed at the uppermost portion of the end wall body 18, which extends to a position close to the inner surface of the exhaust pipe duct 54 and is covered with an exhaust pipe duct 54. Thus, the exhaust gas from the engine 40 reaches the muffler 62 from the exhaust pipe 60, passes through the exhaust pipe 64 connected to the muffler 62, and is discharged to the outside from the exhaust window 19. The muffler 62 and the exhaust pipe 64 are not exposed inside the soundproof box body 12 and are completely surrounded by the shroud 52 and the exhaust pipe duct 54.

Further, a generator 80 directly connected to the output shaft of the engine 40 is disposed on the raised wall 15 along with the exhaust pipe duct 54, and the generator 80 has a built-in cooling fan 82. Due to this action, the exhaust air that has cooled the inside of the generator 80 is sent into the exhaust pipe duct 54 through the shroud 52. In addition, the cooling air passage formed in the shape of a duct as described above is constructed so that the positions are successively higher from the air intake side to the air exhaust side (see Fig. 4 and Fig. 5 above). .

The engine working machine 10 is configured as described above, and when the engine 40 is operated, the groove-shaped member 2
6. The outside air A that has entered the soundproof box body 12 through the outside air inlet 20 and the guide pipe 21 is immediately sucked into the air purifier 42 through the intake port 44, and the air purifier 42
Similarly, the fuel enters the combustion chamber of the engine through a carburetor 46 located near the top of the engine 40.
The exhaust of the engine 40 is then routed through the shroud 52.
and an exhaust pipe 6 surrounded by an exhaust pipe duct 54
0, the sound is discharged from the soundproof box body 12 through the exhaust window 19 via the muffler pipe 62 and the exhaust pipe 64 (see arrow B).

Further, due to the action of the cooling fan 50, the outside air that has entered the soundproof box body 12 through the outside air inlet 22 as shown by arrow C is sucked into the cover 48 through the intake port formed in the cover 48, and the engine 4
The shroud 52 surrounding the outer surface of the engine body and the exhaust pipe duct 54 connected thereto dispel the heat emitted by the engine body, the exhaust pipe 60, the muffler pipe 62, and the exhaust pipe 64, while soundproofing is carried out through the exhaust window 19. is discharged to the outside of the box body 12 (arrow D
reference).

Furthermore, the outside air E that enters the soundproof box body 12 through the outside air inlet 24 by the action of the cooling fan 82 and is sucked into the generator 80 flows into the exhaust pipe duct 54 while dispelling the heat generated by the generator 80. sent.

In this manner, in this embodiment, the air purifier 42 is provided near the top of the engine 40 with its head tilted low, and the guide cylinder 21 is extended from the outside air introduction port 20 side with respect to the intake port 44. Therefore, low-temperature outside air is always supplied to the engine 40, and stable engine output can be obtained.

In addition, the intake noise generated from the air purifier 42 is
Most of it is attenuated inside the soundproof box body 12, and a part of it goes outside through the guide pipe 21 facing the intake port 44, but since the groove-shaped member 26 is attached to the lower surface of the outside air introduction port 20, Leakage to the outside is sufficiently reduced.

Furthermore, the air purifier 42 and the guide cylinder 21 are not connected, and the air purifier 42 is connected to the carburetor 46.
Since the guide cylinder 21 is fixed to the engine 40 and the guide cylinder 21 is fixed to the bottom wall body 14, there is no need to pay attention to the positioning between the two during assembly, and assembly is easy and work efficiency is improved. The support structure of the air cleaner 42 is simple, and there is no need to consider the vibration difference between the air cleaner 42 and the air cleaner 42, and the manufacturing cost can be reduced.

In this way, in the present invention, of the outside air that is taken into the soundproof box from the plurality of outside air intake ports, most of the low-temperature outside air that is taken in from the outside air intake port to which the cylindrical air guide is fixed is Since the air is supplied to the air purifier in a state that hardly mixes with the hot air staying in the soundproof box, the intake air weight of the engine increases, the output is improved and stabilized, and The intake port of the air purifier and the opening of the cylindrical air guide are placed apart, so the air purifier is installed within the vibration system on the engine side, and the cylindrical air guide is installed in the vibration system of the engine side. Despite being fixed to the bottom, the air is sucked in through the intake port by the suction power of the air purifier without being adversely affected by the difference in the vibration system between the two.
Furthermore, because they are spaced apart like this, even when the engine is stopped and immediately after, outside air leaks from the separated area into the soundproof box due to natural convection, so this outside air inlet is used for cooling and ventilation. Furthermore, since the air purifier and the guide tube are individually fixed to the engine side and inside the soundproof box, there is no need to pay close attention to the relationship between the two during assembly, which improves work efficiency. improves.

[Brief explanation of the drawing]

Fig. 1 is an external view of a soundproof engine working machine according to an embodiment of the present invention, Fig. 2 is a perspective view showing the bottom wall thereof, and Fig. 3 is a partially cutaway view of the working machine from the end side. FIG. 4 is a partially cutaway side view of the working machine, and FIG. 5 is a partially cutaway plan view of the working machine. 10...Engine working machine, 12...Soundproof box body,
14... Bottom wall body, 15... Raised wall, 16... Main wall body, 17... Side wall, 18... End wall body, 19... Exhaust window, 20... Outside air inlet, 21... Guide pipe ,2
2...Outside air inlet, 24...Outside air inlet, 26...
... Channel shaped material, 28... Channel shaped material, 30... Moving wheels, 32... Buffer rubber, 34... Partition wall, 40...
Engine, 42...Air purifier, 44...Intake port, 46...Carburetor, 48...Cover, 50...
Cooling fan, 52... Shroud, 54... Exhaust pipe duct, 60... Exhaust pipe, 62... Silencer,
64...exhaust pipe, 70...fuel tank, 80...
Generator, 82...cooling fan.

Claims (1)

[Scope of utility model registration request] In a soundproof engine working machine in which a working machine and an engine that drives the working machine are housed in a soundproof box and are vibration-proofly supported at the bottom of the soundproof box, the cylinder of the engine is arranged in a plane orthogonal to the rotation axis. A carburetor and an air purifier are arranged near the top of the engine, and a plurality of outside air inlets are formed at the bottom of the soundproof box body, and a plurality of outside air inlets are formed at the bottom of the soundproof box. A cylindrical air guiding guide that opens from one of the outside air inlets to the vicinity of the intake port of the air cleaner is fixed to the bottom, and an opening between the air intake port of the air cleaner and the air guiding guide. A soundproof engine working machine characterized by openings that face each other while being separated from each other.