JPS638821Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a soundproof engine generator in which a generator and an engine for driving the generator are housed inside a soundproof case, and more specifically, to the structure of a cooling air intake provided in the soundproof case.

This soundproof engine generator must satisfy two contradictory demands: to improve the sound insulation effect and the internal cooling effect.
The cooling air intake structure and cooling air path configuration were complicated.

For this reason, as shown in FIGS. 1 to 4, cooling air intake slits 20 are arranged in parallel in multiple stages on the vertical wall of the soundproof case 1, and air guide ducts 21 are provided on the inner surface of the vertical wall. By arranging it in an upwardly expanding shape, the structure of the cooling air intake is simplified, and at the same time,
We thought of something that would provide sound insulation and cooling effects.

However, in the above structure, all the opening areas of the cooling air intake slits 20 are configured to be the same.
It was not possible to obtain sufficient sound insulation and cooling effects.

The purpose of this invention is to provide a cooling air intake structure that has a simple configuration, has a relatively high sound insulation effect, and can reduce ventilation resistance. A number of slits with eaves are arranged in parallel in upper and lower stages, and the opening area becomes larger as the lower slits are placed. Inside these slits, there is a wind guide duct with an upwardly expanding shape that also serves as a sound insulator. It is distinctive in that it has been established.

Next, an embodiment of this invention will be described based on FIGS. 1, 2, and 5.

This soundproof engine generator is used as a portable power source for electric welding, lighting, etc. at construction sites, and has a generator 2 and a radiator inside a box-shaped soundproof case 1 with wheels. A diesel engine 4 with a fuel tank 5 attached to the engine 4 is directly connected in front and rear in series, and a fuel tank 5 attached to the engine 4,
A battery 6, a muffler 7, an air cleaner (not shown), etc. are also installed inside.

The soundproof case 1 has a ceiling section 1A and a rear wall section 1B having a hollow double wall structure, and a ceiling section 1A and a rear wall section 1B.
is divided into a front half 1Aa and a rear half 1Ab by a partition wall 8, and the front end of the first half 1Aa and
The upper front end of the soundproof chamber 9 housing the generator 2 and the engine 4 is communicated through a vent 10, and the rear half portion 1Ab and the rear wall portion 1B are communicated with each other.
Further, a radiator 3 is provided on the rear wall portion 1B.

Then, the left and right sides of the first half 1Aa of the ceiling part 1A, and the left and right side walls 1C, 1C of the soundproof case 1.
Cooling air intakes 11, 12, and 13 are provided near the lower front end of the radiator fan 14 and the front end face of the bottom wall of the hollow double-wall structure, respectively, and the air intakes from the radiator fan 14 and the cooling fan 15 inside the generator 2 are provided. As a result, outside air is taken in from the cooling air intakes 11, 12, and 13 into the soundproof room 9, cools the generator 2 and engine 4, and is then pushed out through the radiator 3 to the rear wall 1B, and then to the ceiling. Exhaust port 1 of rear half part 1Ab
It is designed to be ejected from the aircraft from 6 onwards.

In addition, the reference numeral 17 in the figure is an inspection cover provided on the left and right side walls 1C, and the reference numeral 18 is a control box provided on the front wall 1D.

Among the cooling air intakes 11, 12, and 13, the cooling air intake 12 in the left and right side walls 1C, which directly communicates with the soundproof room 9, is configured as follows.

In other words, as shown in FIG. 5, this cooling air intake 12 is formed by cutting out the side wall 1C outward, and horizontally elongated slits 20 having an eaves section 19 that slopes outward are arranged in parallel in multiple stages above and below. In addition, the opening area is configured such that the lower the slit, the larger the opening area, and the inner surface of the side wall 1C has a flat opening that guides the outside air taken in from these 20 groups of slits upward. A wind duct 21 is attached. The duct 21 is configured in an upwardly expanding shape so that the opening area becomes larger toward the top. It is provided to match the lower edge of 20.

When the cooling air intake 12 is configured as described above,
Since the lower slit 20 has a larger opening area,
Even on the lower back end side of the air guiding duct 21, which has a small opening area, the ventilation resistance when outside air is taken in is small, and the upper slit 20, which has a small opening area, has a large effect of sucking air from inside the soundproof case 1. the outside air is sufficiently taken in, and each slit 20
Since the opening area of the wind guiding duct 21 is larger in the upper part where the air volume increases due to the joining of outside air introduced from the outside, the ventilation resistance when outside air is taken in can be reduced as a whole.

Therefore, the outside air can be sucked in smoothly and uniformly through the multiple slits 20 in the upper and lower sides, and can also be guided to the soundproof room 9 by passing through the air guide duct 21 smoothly and with small ventilation resistance.

In addition, since the upper edge of the air guide duct 21 is located higher than the upper edge of the slit 20 group, the noise inside the soundproof case 1 is largely blocked by the air guide duct 21 until it reaches the slit 20 group, and leakage to the outside is prevented. Since the upper slits 20 have smaller opening areas, the noise inside the soundproof case 1 can be more effectively blocked.

Moreover, the moisture contained in the inflowing outside air is allowed to adhere to the air guide duct 21, and the moisture contained in the incoming outside air is transferred to the lowest slit 2 as water droplets.
It will be discharged downward from 0.

In summary, the cooling air intake structure of the soundproof engine generator according to the present invention consists of cooling air intake slits arranged in parallel in multiple stages above and below so that the opening area of the slits becomes larger as the lower tiers are placed. The air guide ducts arranged inside these slit groups are configured in an upwardly expanding shape with the opening area increasing upward, and the upper edge of the air guide duct is positioned higher than the upper edge of the slit group. Therefore, the outside air, which is introduced upward into the soundproof case along the downwardly sloping eaves, is guided into the soundproof case smoothly and with small ventilation resistance using the slit group and the air guide duct. Moreover, leakage of noise inside the soundproof case to the outside can be sufficiently shielded.

In other words, it is a relatively simple configuration that combines a group of eaves-equipped slits whose opening area increases toward the bottom, and a wind guide duct whose opening area expands upward toward the top. Therefore, we were able to obtain a cooling air intake that has a high sound insulation effect, has low ventilation resistance, and can smoothly introduce outside air.

[Brief explanation of the drawing]

Figures 1 to 4 show a conventional example, Figure 1 is a longitudinal cross-sectional side view showing the overall configuration of a soundproof engine generator, Figure 2 is a cross-sectional plan view thereof, and Figure 3 is a cooling air intake structure. 4 is a sectional view taken along the line AA in FIG. 3, and FIG. 5 is a longitudinal sectional front view showing the cooling air intake structure according to this invention. 1...Soundproof case, 19...Eave section, 20...Slit, 21...Wind guide duct.

Claims (1)

[Claims for Utility Model Registration] 1. On the vertical wall of the soundproof case 1, an eave part 1 that slopes downward from the outside.
Cooling air intake slits 20 having 9 slits 20 are arranged in parallel in multiple stages above and below, and the opening area of the slits 20 is arranged such that the lower the slits are, the larger the opening area becomes. A series of wind guide ducts 21 that guide the air upward.
In addition, the air guide duct 21 is configured in an upwardly expanding shape so that its opening area increases upward, and the upper edge of the air guide duct 21 is positioned higher than the upper edge of the slits 20 groups. A cooling air intake structure for a soundproof engine generator featuring: 2. The cooling air intake structure for a soundproof engine generator according to claim 1, wherein the lower end of the air guide duct 21 is aligned with the lower edge of the lowest slit 20.