JPH0229225Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to soundproof engine working machines, which allows the soundproof case to be made smaller and prevents heat radiation from the muffler from affecting other parts both during operation and immediately after stopping. Provide what you want.

To explain in more detail the field of application of the technology that is the premise of the present invention, for example, as shown in FIG. and radiator 3
are arranged in order from the windward side to the leeward side of the ventilation flow by the ventilation fan 4, and a muffler 5 for the engine E is provided in the soundproof case 1.

<Prior art> The conventional soundproof engine working machine
As shown in Publication No. 123916, a muffler housing chamber that also serves as a ventilation exhaust chamber is formed above the highest part of the engine E by a partition wall, and the muffler is housed in the muffler housing chamber, and exhaust ports are provided on both sides of the muffler housing chamber. Dawn,
The muffler was placed on the most downstream side of the ventilation air, so to speak, and the partition wall was used to block the heat radiated from the muffler from reaching the engine generator.

<Problems to be solved by the invention> However, according to the above-mentioned conventional structure, the muffler is located further above the highest part of the engine, which increases the bulk of the entire engine working machine and, in turn, increases the size of the soundproof case itself. It was hard to avoid that.

Furthermore, there was a great possibility that muffler noise would leak directly through the exhaust port.

<Means for solving the problems> The present invention is intended to solve the above problems.
This was proposed with the aim of reducing the size of the soundproof case and improving its soundproofing performance.
This will be explained below using FIGS. 4 to 4.

That is, the muffler 5 is disposed in the corner space A above the side of the engine E in the soundproof case 1 in the front-rear direction, the muffler 5 is covered with a heat insulating material 6, and the upper side surface 7 of the muffler 5 is covered with a heat insulating material 6.
and one lateral side 8 is covered by the top wall part 10 and one lateral side wall part 11 of the soundproof case 1, and the other lateral side 12 and both front and rear sides 14, 15 of the muffler 5 are partitioned by a partition wall 16, and the lateral outside of the muffler 5 is covered. Soundproof case 1
A muffler cooling air intake 17 is provided in one side wall portion 11, and an air guide plate 18 that guides the muffler cooling air taken in from the muffler cooling air intake 17 to the front end side 14 of the muffler 5 is used as the muffler cooling air intake 17. It is provided between the muffler 5 and the muffler 5.

<Function> Therefore, the function of the present invention brought about by the above configuration will be explained. Since the muffler 5 is disposed in the corner space A above the side of the engine E in the front-rear direction,
It can be placed above the engine E, making use of a so-called dead space, and can be set at a height that allows it to wrap around the top end of the engine.

Furthermore, unlike the conventional example, the muffler and the engine working machine are not separated by a partition plate, but by covering the muffler 5 with the heat insulating material 6, heat radiation from the muffler can be suppressed.

Moreover, in addition to the muffler 5, the side surface 12 and both front and rear surfaces 14, 15 are partitioned by a partition wall 16, and the wind guide plate 1
8 is provided between the muffler cooling air intake 17 and the muffler 5, first, the muffler 5 is cooled by the outside air flowing in from the intake 17, and this cooling air flows from the rear to the front of the muffler 5 ( In other words, due to the suction of the ventilation fan 4 of the radiator, the cooling air passes from the rear of the muffler to the front, and the partition plate 16
The heat radiated from the muffler and the cooling air can be mixed smoothly, further improving cooling efficiency.

That is, firstly, the heat radiation from the muffler is reduced by the heat insulating material, and secondly, the muffler is further cooled by the outside air cooling air.

Therefore, while the engine is running, operating the ventilation fan 4 can block the thermal influence of the muffler on the engine work equipment as described above, and even after the engine has stopped, the heat radiated around the muffler is cooled because its density is small. Since it is discharged to the outside through the air intake port 17, it will not have any adverse effect on the engine working machine.

In addition, since the air guide plate 18 is interposed between the muffler 5 and the muffler cooling air intake 17, the noise from the muffler is blocked by the air guide plate 18, and noise leakage to the outside of the soundproof case is significantly suppressed. can.

<Effects of the invention> Therefore, according to the invention, the muffler 5 can be accommodated in the dead space of the engine E to suppress the height of the entire engine working machine, thereby making it possible to downsize and simplify the soundproof case. I can do it.

In addition, since the muffler is covered with a heat insulating material and outside air is introduced to cool the muffler, overheating can be reliably prevented by suppressing the effect of heat dissipation from the muffler on other parts, whether the engine is running or immediately after the engine has stopped. I can do it.

Furthermore, by interposing the baffle plate, it is possible to prevent the noise of the muffler from leaking outside the soundproof case and improve the soundproofing performance.

Moreover, since the air guide plate also serves as a sound insulating plate,
The structure inside the soundproof case can be simplified and implemented at low cost.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 is a cutaway perspective view of the main parts of the soundproof case around the muffler, Figure 2 is a cross-sectional plan view of the main parts of the soundproof engine working machine, Figure 3 is its longitudinal rear view, and Figure 4 is the same engine around the radiator. This is a longitudinal sectional front view of the working machine, and the soundproof engine generator F has an engine E and a generator 2 interlocked in the front and back direction, and the engine generator F is surrounded by a pair of side wall plates from front and rear, left and right, and from above and below. Then, cover it with a so-called box-shaped soundproof case 1.

In this case, the front half 20 of the upper side wall plate is hinged to the rear half so that it can be opened and closed, and the air cleaner 21, muffler 5, etc. described below can be easily maintained and inspected by opening the front half.

A ventilation fan 4 and a radiator 3 are arranged in front of the engine E, and the periphery of the radiator 3 is covered with four partition walls 22 to separate the front of the radiator 3 from the engine room 23 (see Fig. 4). .

The partition wall 22 is made of closed-cell elastic foam, specifically urethane rubber, etc., and prevents the hot air blown from the radiator 3 from flowing back into the engine compartment 23 and reduces noise in the engine compartment 23. This partition wall 22 is configured to insulate the sound.

On the other hand, an air cleaner 21 is fixed to the upper left of the engine E, and a cylindrical muffler 5 is disposed in the upper right corner space A in a longitudinal direction via two support arms 24. A heat insulating material 6 made of foamed resin or the like is wrapped around the side cylinder part of the muffler 5.
to sufficiently suppress heat radiation from the muffler.

Further, the upper side 7 and one lateral side 8 of the muffler 5, that is, the right side, are covered with the upper wall part 10 and one lateral side wall part 11 of the soundproof case 1. (forms part of the upper half side plate 20), its rear side 15 is connected to the generator chamber 25 in order to prevent the generator 2 from dielectric breakdown due to water leakage.
is closed off by a waterproof partition wall 16 that separates it from the engine compartment 23.

An L-shaped partition wall 16 is provided along the side surface 12 of the muffler 5, that is, the left side surface and the front side surface 14.
are arranged to shield both sides 12 and 14 from the engine E (however, there is no partition wall 16 on the lower side of the muffler 5), and then the upper and right parts of the muffler 5 are covered with a soundproof case 1. Part of the front, rear, and left parts of the partition wall and waterproof partition wall 16
Each is surrounded by

On the other hand, a plurality of muffler cooling air intakes 17 in the form of punched openings are formed in the right side wall portion 11 of the soundproof case 1 on the right side outer side of the muffler 5, and the space between the cooling air intakes 17 and the muffler 5 is closed and closed. A baffle plate 18 is provided in the front-rear direction.

The baffle plate 18 is formed in an inclined shape so as to approach the muffler 5 as it goes upward, and its front 18a is in contact with the front surface 27 of the L-shaped partition wall 16, and its rear 18b is in contact with the waterproof partition wall 16. After getting close to
A bypass gap 28 is provided so that ventilation air can bypass.

In this case, as mentioned above, the lower part of the muffler 5 is open toward the engine E, so during engine operation, the muffler cooling air is directed toward the front of the engine E, which has been reduced in pressure by the ventilation fan 4. flows from the intake port 17 toward the waterproof partition wall 16, then turns around in the detour gap 28, flows from the rear to the front along the muffler 5, cools the muffler 5, and then flows to the lower front of the muffler 5. The air is sucked out through the ventilation fan 4 to the front of the radiator 3.

Furthermore, when the engine is stopped, the rotation of the ventilation fan 4 also stops, but the hot air around the muffler 5 is light and therefore does not descend below the engine E.
8 and is naturally discharged to the outside of the soundproof case 1 from the muffler cooling air intake 17.

Therefore, even if some heat is radiated from the muffler 5 through the heat insulating material 6, the thermal influence of the muffler 5 can be reliably prevented from reaching other parts around it, regardless of whether the engine is running or immediately after it has stopped.

It goes without saying that the present invention can be applied not only to engine generators, but also to engine welders, engine compressors, engine pumps, etc.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention.
The figure is a cutaway perspective view of the main parts of the soundproof case around the muffler, Figure 2 is a cross-sectional plan view of the main parts of the soundproof engine working machine, Figure 3 is a vertical cross-sectional rear view of the same engine working machine, and Figure 4 is the same engine working machine around the radiator. FIG. 1...Soundproof case, 2...Work equipment, 3...Radiator, 4...Ventilation fan, 5...Muffler, 7...
...Top side of 5, 8...one lateral side of 5, 10...1
Upper wall portion, 11... One side wall portion of 1, 12...
...Other side surfaces of 5, 14...Front side of 5, 15...
5 rear side, 16...partition wall, 17...muffler cooling air intake, 18...air guide port, E...engine,
A... Corner space above and beside E.

Claims (1)

[Scope of utility model registration request] In a soundproof case 1 formed to allow ventilation, a working machine 2, an engine E that drives it, and a radiator 3 are arranged in order from the windward side to the leeward side of the ventilation flow by the ventilation fan 4, and the work machine 2 is soundproofed. In a soundproof engine working machine including a muffler 5 for the engine E in the case 1, the engine E in the soundproof case 1
The muffler 5 is arranged in the horizontal upper corner space A in the front-rear direction, the muffler 5 is covered with a heat insulating material 6, and the muffler 5 is
Covering the upper side surface 7 and one side surface 8 with the upper wall portion 10 and one side wall portion 11 of the soundproof case 1,
In addition to the muffler 5, the side surface 12 and both front and rear sides 14,1
5 is partitioned by a partition wall 16, and a muffler cooling air intake 17 is formed in one side wall portion 11 of the soundproof case 1 on the outside side of the muffler 5, and the muffler cooling air taken in from the muffler cooling air intake 17 is transferred to the front end of the muffler 5. This soundproof engine working machine is characterized in that a wind guide plate 18 for guiding to the side 14 is provided between the muffler cooling air intake 17 and the muffler 5.