JPS5922260Y2 - Soundproofing equipment for small power machines - Google Patents

Description

[Detailed description of the invention] The present invention is a soundproofing device in which a small power machine such as an engine-driven welding machine or a generator is surrounded by a soundproofing wall. The present invention relates to a soundproofing device that can shorten warm-up operation time and prevent paper locks, especially in the summer.

Conventionally, various techniques have been devised for this type of soundproofing device, but the applicant has also proposed
No. 083 and Utility Model Application No. 168084/1984 have already been proposed.

In other words, in a soundproofing device in which a power machine driven by an engine is surrounded by a soundproofing wall, an intake port is provided at the front of the soundproofing case, and a two-stage upper and lower case is provided with an opening/closing door that interlocks with each other at the rear of the engine. A sound deadening duct is installed, and after cooling the inside of the generator and engine by cooling the engine and the cooling fan equipped with the engine and the generator, the exhaust air pressure is used to open and close the door of the lower sound deadening duct. Hot air is discharged from the inside of the lower silencing duct to the outside, and the opening/closing door of the upper silencing duct is closed.

Furthermore, when the engine is stopped, the opening/closing door of the upper silencing duct is opened to ventilate the inside of the soundproof case through the upper silencing duct, thereby effectively performing a cooling action immediately after the engine is stopped.

However, there is a demand in the market for a device that can shorten warm-up operation time, prevent paper lock in the summer, provide better soundproofing and cooling efficiency than the previous devices, and can cool the stored muffler well. has been done.

The present invention was developed to meet the above-mentioned needs, and is a soundproof case for a small power machine in which the engine and the generator driven by the engine are surrounded by a soundproof wall.
An intake port is provided on the bottom surface of the soundproof case, and an exhaust duct is provided at the rear of the engine so as to be able to communicate with the inside of the soundproof case and the inside of the engine case, and the exhaust duct is provided with a cooling fan of the engine to cool each of the intake ports. The exhaust air introduced through the generator and engine should be
An automatic opening/closing door is provided which rotates only when the wind pressure exceeds a predetermined value, and the automatic opening/closing door is provided so as to be openable and closable so as to send a part of the introduced exhaust air into the soundproof case only during warm-up operation, and To provide a soundproofing device for a small power machine, characterized in that a muffler is connected to an exhaust duct so as to be cooled by a part of the exhaust air.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a soundproofing device for a small power machine according to the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a soundproof case with a sound absorbing material 2 pasted on its inner surface, and a generator 4 and an engine 5 for driving the generator 4 are installed with vibration isolating rubber 3, 3 interposed inside and the bottom surface 1a floating. ing.

An appropriate number of air intake ports 6 are provided on the bottom surface 1a of the soundproof case 1.
In this case, the intake port 6 is provided at a position corresponding to the intake ports 8 and 9 of the generator 4 and the engine 5. has the suction port 8 at
A cooling fan 10 is directly connected to the rear of the generator to cool the inside of the generator, and then the air is discharged from an exhaust port 11 into the soundproof case.

Further, an engine cooling fan 12 is directly connected to the rear of the engine 5 that drives the generator 4, and when the engine fan 12 rotates as the engine 5 is driven, a suction port 9 provided in the cylinder head 5a at the front of the engine A so-called Perth engine is used which allows ventilation to flow inside the engine case, and the hot air that cools the inside of the engine is discharged to the outside through an exhaust duct 15.

That is, the engine cooling fan 12 is surrounded by a fan case 13, and its exhaust port 14 is connected to an exhaust duct 15 so as to be able to communicate with each other.

This exhaust duct 15 is a soundproof case 1 located above the rear of the engine.
The duct is provided so as to be able to communicate with the outside via an exhaust port 16 attached therein, and with the inside of the soundproof case 1 via a vent hole 17 drilled in one side wall of the duct.

On the inner surface of one side wall of the ventilation duct 15, a curved portion of an automatic opening/closing door 18, which is curved into a substantially V-shape, is rotatably supported. Accordingly, one door piece 18a is formed into a rectangular shape that matches the shape of the ventilation hole 17 so that the ventilation hole 17 can be closed, and the other door piece 18a is formed into a rectangular shape that matches the shape of the ventilation hole 17.
8 b has a lid part 18 that can cover a part of the exhaust port 14.
C extends from the upper end, and has mounting pieces 18d, 18d hanging from both ends of the curved portion.

And this mounting piece 18d. 18d is pivotally supported by a bracket 19 attached to the inner surface of the wall of the exhaust duct 15.

Sound absorbing material 2 is attached to the inner and outer surfaces of the exhaust duct 15 and the surface of the door piece 18 a on the side of the vent 17 to maintain a soundproofing effect and to keep the vent 17 airtight.

On the other hand, a ventilation cylinder 20 is provided on one side of the rear part of the engine 5, and the ventilation cylinder 20 is formed in a double structure, with an outer part connected to the exhaust duct 15 via a flexible pipe 23, and an inner part connected to the exhaust duct 15. It has a double structure with a muffler 21 formed on the top.

This muffler 21 is connected to the engine 5 through an exhaust pipe 22 and an exhaust port 24 of the muffler 21 and a vent pipe 20.
The exhaust port 25 faces a transparent port 26 formed in the soundproof case 1.

Note that 27 is a baffle plate for sound insulation.

In the soundproofing device having the above configuration, first, when the engine 5 starts driving, a warm-up operation is performed at low speed for several minutes. At this time, the rotation of the cooling fan 10 provided in the generator
After introducing outside air into the soundproof case 1 from... and cooling the inside of the generator through the suction port 8,
The air is discharged from the air into the soundproof case 1, and further introduced into the engine case through the suction port 9 by the rotation of the engine cooling fan 12.

In this case, outside air is also introduced into the engine case from the intake port 6 located corresponding to the intake port 9, and the generator 4 and the engine 5 are
This improves the cooling efficiency of the inside of the soundproof case, generator, and engine.

Cooling air in the engine 5 is not discharged into the soundproof case 1 but passes through the fan case 13 and is introduced into the exhaust duct 15 from the exhaust port 14. However, during warm-up operation, the automatic opening/closing door 18 is Its center of gravity Ma as shown in figure a
Since it is far from the fulcrum of the door, it does not have enough wind pressure to rotate the door, and after being introduced into the exhaust duct 15 through the side of the lid 18C, it is released from the exhaust port 16 to the outside. It is discharged.

Further, since the automatic opening/closing door 18 does not rotate, the ventilation 7 is in an open state, and therefore, a portion of the hot air that has cooled the inside of the engine 5 as described above is introduced into the soundproof case 1 through the ventilation port 17. .

During rated operation, that is, high-speed rotation, the hot air that cools the generator 4 and engine 5 as described above has more force than required, so the automatic opening/closing door 18 is closed as shown in FIG.
The air is rotated to close the ventilation port 17, so that the air is discharged to the outside from the ventilation port 16 via the ventilation duct 15.

During such operation, a part of the air in the exhaust duct 15 is introduced into the ventilation cylinder 20 through the flexible pipe 23, and after cooling the muffler 21, is discharged to the outside from the respective exhaust ports together with the exhaust gas from the engine 5. Ru.

When the engine 5 is stopped, the automatic opening/closing door 18 moves back, so the vent 17 is opened, and the outside and the inside of the soundproof case 1 are communicated via the exhaust duct 15, so that the hot air inside the soundproof case 1 is is discharged to the outside from the ventilation port 16 via the ventilation port 17 and the ventilation duct 15, and at the same time, the air intake port 6...
It is also emitted from...

Furthermore, when the automatic opening/closing door 18 shifts from high-speed operation to low-speed operation, as shown in FIG. 6C, the center of gravity MC of the door is close to the fulcrum, so it maintains its balance even with a small amount of wind pressure, and the door does not open. Also, when the machine is stopped, there is no wind pressure, so the door opens.

As described above, according to the soundproofing device for a small power machine according to the present invention, since the intake port is provided only on the bottom of the soundproof case and the exhaust port is provided in one place at the rear of the engine, it not only has a soundproofing effect, but also has a soundproofing effect on the generator and the engine. In addition, the exhaust duct is equipped with an automatic opening/closing door that rotates when the exhaust air pressure exceeds a certain level, and the opening/closing operation of the automatic opening/closing door makes it possible to soundproof a portion of the exhaust air only during warm-up operation. Since the flow is reversed into the case, it is possible to promote the temperature rise inside the soundproof case, shorten the warm-up operation time especially in cold weather, prevent paper lock, and perform good operation.

Additionally, during rated operation, the automatic opening/closing door is lifted upwards, allowing hot air from the engine to be released directly to the outside without being forced into the soundproof case.

Furthermore, since a portion of the exhaust air in the exhaust duct is sent into the double-structured muffler room, the muffler can be efficiently cooled, and the structure suppresses the heat generated by the muffler as much as possible.

Moreover, immediately after the operation is stopped, the outside and the inside of the soundproof case are communicated through the exhaust duct, so the hot air inside the soundproof case is exhausted outside at once, so-called ventilation effect, which prevents the temperature from rising abnormally. Can be effectively prevented.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the soundproofing device for a small power machine according to the present invention, Fig. 2 is a cross-sectional view thereof, Fig. 3 is a longitudinal cross-sectional view showing the exhaust duct thereof, and Fig. 4 is a perspective view of the automatic opening/closing door, Figure 5 is a vertical cross-sectional view of the exhaust duct showing the installation state of the muffler, and Figure 6 a, l), and c are the illustrations of the exhaust duct installed in various modes of the power machine. It is a figure showing the opening and closing state of the automatic opening and closing door. 1...Soundproof case, 1a...Bottom of soundproof case, 4...Small power machine, 5...
・Engine, 6...Intake port, 10.12...
...Cooling fan, 15...Exhaust duct, 18
...Automatic opening/closing door, 20...Vent cylinder, 2
1...Muffler.

Claims (2)

[Scope of utility model registration request] (1) In a soundproof case for a small power machine in which an engine and a generator driven by the engine are surrounded by a soundproof wall, an intake port is provided on the bottom of the soundproof case, and an air inlet is provided inside the soundproof case and inside the engine case at the rear of the engine. is provided with an exhaust duct so as to be able to communicate with the outside, and the exhaust duct is provided with an exhaust air duct which is used by the cooling fan of the engine to collect the exhaust air introduced from the intake port through the inside of the generator and the engine to be cooled respectively. An automatic opening/closing door is provided that rotates only during wind pressure, and the automatic opening/closing door is provided so as to be openable and closable so as to send a part of the introduced exhaust air into the soundproof case only during warm-up operation, and the exhaust duct is connected to the exhaust duct. A soundproofing device for a small power machine, which is characterized by having a muffler connected so that part of the exhaust air can be used to cool the machine. (2) The muffler is formed on the inner side of a ventilation pipe having a double structure of inside and outside, and the outside part of the ventilation pipe is connected to the exhaust duct. A soundproofing device for a small power machine according to item 1.