JPS5836815Y2 - Cooling structure for small soundproof internal combustion engine driven work equipment゜ - Google Patents

Description

[Detailed description of the invention] This invention is a soundproof box that connects work equipment such as a generator that is directly connected to a small air-cooled internal combustion engine, a welding machine, or a pump that is directly connected to a small air-cooled internal combustion engine that is equipped with a generator for lighting and charging. This invention relates to a cooling structure for a small, soundproof internal combustion engine-driven working machine housed in a small, soundproof internal combustion engine.

The well-known Tofu-ri internal combustion engine-driven small generators, welding generators, pumps, and other working machines are widely used because they are small and highly portable and can be easily used for field work.
Its uses are likely to expand further in the future.

On the other hand, one drawback is that they are noisy and can cause noise pollution when used for night lighting or night work, and for this reason, various soundproof structures have been proposed.

In other words, a small air-cooled internal combustion engine and working equipment such as a generator or welding machine that is directly connected to the engine are housed in a soundproof box with a soundproof structure. As the temperature rises, cooling air is introduced into the soundproof box to cool and ventilate the room in order to cool the internal combustion engine and working equipment.

However, since the entire device is small, it does not have enough ventilation passages and cannot completely ventilate the room.

In particular, the lubricating oil in the crankcase of an internal combustion engine is not completely cooled, causing the oil temperature to rise, which not only shortens the life of the oil, but also poses a risk of seizure of the piston due to a decrease in the viscosity of the oil.

The present invention eliminates these drawbacks and provides a cooling structure that prevents the temperature of lubricating oil in the crankcase of an internal combustion engine from rising 1 and effectively prevents noise leaking from the soundproof box.

In the present invention, the inside of a soundproof box is divided into a ventilation room and an exhaust air chamber by a partition plate, a small air-cooled internal combustion engine and a working machine driven by the internal combustion engine are housed in the ventilation room, and the internal combustion engine is housed in the ventilation room. An exhaust fan and an exhaust gas muffler for the internal combustion engine are provided, which are connected to the shaft end of the internal combustion engine, and an exhaust port for the exhaust fan and an exhaust port for the exhaust gas muffler are provided in a soundproof box. Or, in a small soundproof internal combustion engine driven work machine that is equipped with a charging generator or uses the work machine as a generator, a soundproof box is installed at a position almost directly below the crankcase of the internal combustion engine to supply cool air to the crankcase of the internal combustion engine. a first opening for supplying the soundproof box, an electric fan operated by the power generated by the generator by the rotation of the internal combustion engine is installed in the first opening, and the first opening is opened in the lateral direction of the soundproof box or The air cleaner and the carburetor of the internal combustion engine are connected to the outside of the soundproof box through at least two dedicated intake ducts extending in the longitudinal direction, and the air cleaner and the carburetor of the internal combustion engine are connected to the duct passage between the first opening and the outside air intake of the dedicated intake duct. It is characterized by having a second opening for supplying cold air.

As a result, there is no rise in the temperature of the lubricating oil, stable continuous operation is possible, and noise leaking from the soundproof box is effectively prevented.

The present invention will be explained below with reference to the embodiments shown in the drawings.

FIG. 1 is an external perspective view of an embodiment of the present invention, FIG. 2 is a front view showing the arrangement of internal equipment in FIG.

FIG. 3 is a plan view of the tn-Taya cross section of FIG. 2.

In these figures, 1 is a small air-cooled internal combustion engine, and 2 is a generator directly driven by the internal combustion engine 1.

3 is a battery used as a power source for starting the internal combustion engine, 4 is an air cleaner for the internal combustion engine, and 5 is an exhaust gas muffler connected to the internal combustion engine 1 through a pipe T.

The pipe T is used for exhaust gas and has a high temperature, and the pipe T is surrounded by a cover 47 to prevent the temperature of the air cleaner 4 and the vaporizer 49 which are adjacent to the pipe T from rising.

Reference numeral 6 denotes an exhaust fan connected to the shaft end of the internal combustion engine 1, and the internal combustion engine 1 and the exhaust fan 6 are separated by a partition plate 25.

The internal combustion engine 1 and the generator 2 are each fixed to a bottom plate 9 of a soundproof box 10 via vibration-proof rubber 8.

The fuel tank 11 is fixed by a bracket 13 so as to be pressed against the canopy 12 of the soundproof box 10, and the fuel filler cap 14 is fixed.
is attached so that it can be removed from the outside of the canopy 12.

As shown in Fig. 1, the side plate 15 on the side of the generator 2, which is a working machine, is provided with outside air intakes 16° and 17 on both sides of the lower part, and the central part is slanted to accommodate a starting switch, a meter, or a power source for work. An operation panel 18 having an outlet and the like is formed, and an outside air intake 19 for directly cooling the fuel tank 11 is provided at the upper end of the side plate 15.

The canopy 12 of the soundproof box 10 is provided with an inspection door 20 and hanging fittings 21, and the front plate 22 is also provided with an internal inspection opening/closing door 23 and a battery storage fixing field 24.

Several elongated holes 48 for heat radiation of the battery 3 are opened in the storage fixation field 24.

The exhaust air coming out of the exhaust fan 6 in the exhaust room 26 partitioned by the partition plate 25 in the soundproof box 10 takes away the heat from the exhaust gas muffler 5 in the same room 26 and passes through the exhaust duct 27. , the air is exhausted from the air outlet 30 (see FIG. 4) of the side plate 29.

Exhaust gas from the internal combustion engine 1 passes through the exhaust pipe 7, connects with the exhaust gas muffler 5, passes through the exhaust duct 28, and then reaches the exhaust port 3.
1 (see Figure 4).

Four small wheels 32 are installed on the bottom plate 9 of the soundproof box 10,
Make it movable.

FIG. 4 is an external perspective view of the embodiment of the present invention (FIG. 1) seen from the bottom plate 9, and FIG.
FIG. 6 is a partial perspective view showing the arrangement, and FIG. 6 is a perspective view showing the arrangement of the equipment ducts of the ventilation and exhaust system as seen from the exhaust port 30 side.

As shown in FIG. 4, the duct extending in the horizontal direction of the soundproof box provided in the center of the bottom plate 9 is a dedicated second intake duct 33 that directly introduces outside air to directly cool the crankcase 36 of the internal combustion engine 1. As can be seen, outside air is introduced from the outside air intake port 17 through the dedicated first intake duct 37 extending in the vertical direction of the soundproof box and the opening 38 in the bottom plate 9.

An electric fan 35 operated by the power generated by the generator 20 is fixedly arranged in the opening 39 of the bottom plate 9 located in the center of the second dedicated intake duct 33, and cooled outside air is directly supplied to the crankcase 3.
Spray on the bottom surface of 6 and let it cool directly.

Further, the end surface of the bottom plate 9 of the second dedicated suction duct 33 on the opening 38 side is made blind, and the opposite end surface is opened as an outside air intake port 40, and between the outside air intake port 40 and the bottom plate opening 39 for the electric fan 35. An opening 41 is provided in the bottom plate 9 of the engine at a position just below the air cleaner 4 and the carburetor 49, and the intake air for combustion of the internal combustion engine is drawn directly from the outside air through the openings 40 and 41. Direct cooling of the vaporizer is also performed.

A short duct arranged parallel to the second dedicated intake duct 33 is a duct 34 for discharging ventilation cooling air from the generator 2.

As shown in FIG. 6, an opening 42 communicating with the exhaust duct 34 is provided, a generator exhaust duct 43 is placed above the opening 42, and a built-in fan (not shown) of the generator 2 is used to
Exhaust port 4 of duct 34 for discharging ventilation cooling air inside generator 2
Let it drain from 4.

Next, the flow of cooling air due to the operation of the internal combustion engine will be explained.

When the internal combustion engine 1 is started and rotated, the generator 2 rotates, and the exhaust fan 6 and the generator built-in fan (not shown) also rotate to suck and exhaust indoor ventilation cooling air.

The electric fan 35 is also rotated by the power generated by the generator, and the dedicated suction duct 37.3 is supplied from the outside air intake ports 17 and 40.
Cool air is blown onto the lower surface of the crankcase 36 through the crank case 36.

On the other hand, the outside air taken in through the outside air intake port 40 is supplied to the air cleaner 4 through the opening 41, and part of it also cools the vaporizer 49 located at the rear of the air cleaner.

Ventilation on the generator 2 side is from the outside air intake 16 to the suction duct 46.
A part of it is sucked into the ventilation chamber 45 of the soundproof box 10, and a part of it is sucked into the generator from the end face of the generator 2 and cooled, and is discharged to the discharge port 44 through the discharge duct 43 opening 42 and the discharge duct 34. .

The remaining cooling air taken in from the outside air intake port 16 is used as fuel tank cooling air taken in through the outside air intake port 19 or the electric fan 35.
The crank part of the internal combustion engine is cooled and passed along with the cooling air that directly cools the crankcase 36 and the carburetor cooling air sucked through the opening 41, and the air is discharged into the exhaust chamber 26 by the exhaust fan 6. After cooling the muffler 5 by making many twists and turns in the air exhaust chamber 26 as shown by the arrows in FIG.

On the other hand, the exhaust gas is further absorbed by the exhaust duct 28 than the muffler 5 and is discharged from the exhaust port 31.

In this embodiment, the working machine was explained as a generator, but even if the working machine is a welding machine, the effect can be achieved with the same cooling structure, and it is natural that it is included in the present invention, and it is If the working machine is something other than a generator, such as a pump, a generator for illumination or charging is attached to the internal combustion engine, and it is naturally included in the present invention as a soundproof working machine.

As described above, according to the present invention, outside air can be forcibly blown onto the crankcase using an electric fan provided separately from the exhaust fan for ventilation inside the soundproof box.1. The noise inside the soundproof box leaks from the opening where the old electric fan was opened, and the noise is generated from the electric fan.

Noise is effectively muffled by branching into a dedicated intake duct that extends horizontally or vertically in the soundproof box, and the air cleaner and carburetor of the internal combustion engine are connected to other openings in the dedicated intake duct before the crankcase is cooled. Outside air is supplied, and the temperature of the lubricating oil in the internal combustion engine of the small, soundproof internal combustion engine-driven work machine is completely prevented from rising, and the electric fan for cooling the crankcase automatically operates in conjunction with the start and stop of the work machine. Therefore, the operation is extremely simple, and at the same time, each device in the room is completely cooled, and at the same time, it is possible to provide a stable soundproof working machine with little noise.

[Brief explanation of drawings]

1 is an external perspective view of an embodiment of the present invention, FIG. 2 is a front view of the internal equipment shown in FIG. - ■ A plan view of the section taken in the direction of the arrows, Fig. 4 is a perspective view of the embodiment of the present invention seen from the rear bottom plate side of Fig. 1, and Fig. 5 shows the arrangement of the suction duct as seen from the operation panel of Fig. 1. FIG. 6 is a perspective view showing the arrangement of equipment and ducts of the ventilation and exhaust system as seen from the ventilation port side. 1... Internal combustion engine, 2... Generator (work equipment), 5... Exhaust gas silencer, 6...
・Exhaust fan, 10... Soundproof box, 16, 1γ, 19
, 40...Outside air intake, 26...Exhaust chamber, 2T...Exhaust duct, 28...Exhaust duct, 30...・Exhaust port, 31...
Exhaust port, 33.3γ... Dedicated intake duct, 34
...Exhaust duct, 35...Electric fan, 36...Crank case.

Claims (1)

[Scope of utility model registration request] The inside of the soundproof box is divided into a ventilation room and an exhaust room by a partition plate, and the ventilation room accommodates a small air-cooled internal combustion engine and a working machine driven by the internal combustion engine. An exhaust fan and a muffler for the exhaust gas of the internal combustion engine are provided to be combined, an exhaust port of the exhaust fan and an exhaust port of the muffler for the exhaust gas are provided in a soundproof box, and the internal combustion engine is connected to power generation for lighting or charging. or a small soundproof internal combustion engine driven working machine that uses the working machine as a generator, cool air is supplied to the crankcase of the internal combustion engine in a soundproof box located almost directly below the crankcase of the internal combustion engine. A first opening for supplying the noise is provided, and an electric fan that is operated by the power generated by the generator by rotation of the internal combustion engine is installed in the first opening, and the first opening is opened in the horizontal or vertical direction of the soundproof box. at least two extending in the direction
A second intake duct that communicates with the outside of the soundproof box through two dedicated intake ducts, and supplies cold air to the air cleaner and carburetor of the internal combustion engine through a duct passage between the first opening and the outside air intake port of the dedicated intake duct. A cooling structure for a small soundproof internal combustion engine-driven working machine, characterized by having two openings.