JPH05272356A - Air intake device for sound-proofing type generator - Google Patents

Abstract

PURPOSE:To minimize intake noise of a sound-proofing type generator, prevent decrease in engine output by sucking the outside air at a low temperature, and reduce the suction of dust and the like. CONSTITUTION:A lower noise absorbing room 3 which is provided with a certain clearance to an engine base 2, an upper noise absorbing room 4 which is formed on the lower noise absorbing room 3, and an upper noise absorbing duct 5 which is formed on the upper noise absorbing room 4 are sealed with a side cover 15 and a front cover 10, and suction holes 7, 9 are provided at a bloor board 8 and a floor board 6 respectively. Moreover a suction hole 16 which communicates with the upper noise absorbing duct 5 is provided at the side surface of the side cover 15, and the lower noise absorbing room 3 and an air cleaner 14 are connected by a flexible duct 13 to form a sealed air passage. It is thus possible to reduce intake noise and mixture of dust by sucking air from an air suction hole 16 which is located at a high position, separate and remove dust in the air passage, and suck only the air at a low temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof type generator which reduces the intake noise of the soundproof type generator, sucks the outside air having a low temperature to prevent the engine output from lowering, and reduces the intake of dust and the like. The present invention relates to an intake device.

[0002]

2. Description of the Related Art Soundproof type generators are often used at construction sites in urban areas. Therefore, from the viewpoint of noise pollution day and night, it is necessary to minimize the noise generated by the soundproof type generator. A noise generation source of the soundproof type generator is a suction noise of air sucked by an air cleaner.

As a conventional soundproof type generator, for example
In the 32836 publication, a plurality of outside air introduction holes are formed in the bottom wall body, and an outside air introduction hole near the intake port of the air cleaner is provided with a guide cylinder facing the intake port of the air cleaner. Separate the vibrating air cleaner and the non-vibrating guide cylinder to eliminate the adverse effects of vibration, and to avoid mixing with the heated air by cooling the equipment inside the soundproof room that is sucked in from other outside air introduction holes. Thus, an air cleaner intake device is disclosed in which the lowering of the engine output is suppressed by mainly supplying the outside air having a low temperature sucked from the guiding cylinder to the engine.

[0004]

However, the above-mentioned conventional air cleaner intake device has the following problems. That is, noise generated by the engine itself or noise due to vibration is considered as a normal noise generation source,
Although soundproofing measures have been taken for these noises, they are not taken against the noise of air suction that is generated when sucking into the air cleaner. For example, in this conventional example, since the guiding cylinder is provided so as to face the intake port of the air cleaner, the flow velocity of air sucked from the intake port of the released air cleaner, the suction inlet shape of the intake port, and the inside of the guiding cylinder. Due to hydrodynamic conditions such as the air flow velocity and the shape of the outlet of the guiding cylinder, a sound is generated when air is sucked from the intake port (hereinafter referred to as suction noise). This suction sound is generated as a muffled sound in a soundproof box housing a device such as an engine, and this muffled sound causes noise pollution.

Next, since the guiding cylinder is provided facing the intake port of the air cleaner, the outside air sucked from the guiding cylinder is mainly sucked from the intake port of the air cleaner, and the outside air having a low temperature is supplied to the engine. However, as long as the air cleaner intake port is open, the air in the soundproof box will be slightly sucked. Therefore, there is a problem that the density of the air supplied to the engine is reduced to that extent and the engine output is reduced.

Further, since the outside air is sucked from the outside air introduction hole formed in the bottom wall, a large amount of dust is likely to be contained in the sucked air, and the air cleaner is clogged early to improve the engine efficiency. There is a problem in that it causes a decrease in the service life and shortens the service life of the air cleaner.

The present invention provides an air intake device for a soundproof type generator, which reduces the intake noise of the soundproof type generator, sucks the outside air having a low temperature to prevent a decrease in engine output, and reduces the intake of dust and the like. To do.

[0008]

Means for Solving the Problems According to the present invention for solving the above-mentioned problems, a lower sound absorbing chamber is provided with a certain gap between the engine base and the upper sound absorbing chamber. Forming a chamber, and further forming an upper sound absorbing duct on the upper sound absorbing chamber, and as a partition floor between the lower sound absorbing chamber and the upper sound absorbing chamber and a partition floor between the upper sound absorbing chamber and the upper sound absorbing duct. Intake holes are provided respectively, the lower sound absorbing chamber, the upper sound absorbing chamber and the upper sound absorbing duct are hermetically sealed with a side cover and a front cover, and a suction hole communicating with the upper sound absorbing duct is provided on a side surface of the side cover or the front cover. The lower sound absorbing chamber and the air cleaner are connected by a flexible duct.

[0009]

The present invention having the above-mentioned structure has the following functions. That is, a lower sound absorbing chamber formed with a certain gap between the engine base, an upper sound absorbing chamber formed on the lower sound absorbing chamber, and an upper sound absorbing duct formed on the upper sound absorbing chamber are provided with side covers and The front cover is hermetically sealed, and intake holes are provided on the partition floor between the lower sound absorbing chamber and the upper sound absorbing chamber and the partition floor between the upper sound absorbing chamber and the upper sound absorbing duct. Since a suction hole communicating with the sound absorbing duct is provided and the lower sound absorbing chamber and the air cleaner are connected by a flexible duct, the air sucked by the air cleaner flows in through the suction hole provided in the side cover or the front cover, and the upper sound absorbing duct, the floor. Intake hole opened on the surface,
It is sucked into the air cleaner via the upper sound absorbing chamber, the air intake hole in the floor, the lower sound absorbing chamber, and the flexible duct.

Since the air is sucked through the suction holes at the high position provided in the side cover or the front cover, the suction of dust is reduced, and the air velocity is slow while passing through the upper sound absorbing duct, and the floor surface is low. When passing through the intake hole opened in the floor, it is early, when passing through the upper sound absorbing chamber, it is slow, when passing through the intake hole opened in the floor, it is slow when passing through the lower sound absorbing chamber. The flow becomes turbulent and the dust contained in the air is removed, and this air flow path has an upper sound absorbing duct, an air intake hole opened on the floor surface, an upper sound absorbing chamber, an air intake hole opened on the floor, and a lower sound absorbing chamber. Also, since it is formed by a flexible duct, the suction noise is reduced by the air flowing along this air flow path, and even if some suction noise is generated, this suction noise is prevented from leaking to the outside. It becomes possible to.

Further, since the lower sound absorbing chamber and the air cleaner are connected by the flexible duct, the problem of vibration is solved, and only the outside air having a low temperature is sucked from the suction hole provided in the side cover or the front cover. In addition, since the opening of the flexible duct is in the lower sound absorbing chamber, it is possible to reduce the suction sound of the flexible duct in the lower sound absorbing chamber.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a lower sound absorbing chamber 3 is formed with a certain clearance provided between the engine base 2 supporting the engine 1 as a mount, and an upper sound absorbing chamber 4 is formed on the lower sound absorbing chamber 3. An upper sound absorbing duct 5 is formed on the upper sound absorbing chamber 4. Upper sound absorbing duct 5 and upper sound absorbing chamber 4
An air intake hole 7 is formed by notching a part of a floor plate 6 partitioning the above and an air intake hole 9 is formed by cutting out a part of a floor plate 8 partitioning the upper intake chamber 4 and the lower intake chamber 3. ing.

In this embodiment, the intake hole 7 has a front cover 10
The side close to is widely cut away, and the intake hole 9 is a side distant from the front cover 10 and is a small hole. Therefore, the flow of air is largely reversed at the intake holes 7 and the flow velocity is increased at the intake holes 9 to flow into the lower sound absorbing chamber 3. The sound absorbing material 11 is attached to the inner surfaces of the lower sound absorbing chamber 3, the upper sound absorbing chamber 4, and the upper sound absorbing duct 5. The lower sound absorbing chamber 3 and the air cleaner 14 are connected by a flexible duct 13 connected to the ceiling plate 12 of the lower sound absorbing chamber 3.

As shown in FIGS. 3 and 4, the lower sound absorbing chamber 3, the upper sound absorbing chamber 4 and the upper sound absorbing duct 5 are formed at the corners of the engine base 2, and the front cover 10 and the side covers 15 are used to absorb the lower sound absorbing properties. Two sides of the chamber 3, the upper sound absorbing chamber 4 and the upper sound absorbing duct 5 are hermetically sealed,
In this embodiment, a suction hole 16 is provided in the front cover 15 so as to communicate with the upper sound absorbing duct 5. Further, a sound absorbing material is attached to the inner surfaces of the front cover 10 and the side cover 15 to form a soundproof box for housing equipment such as the engine 1. FIG. 2 is an external view of this embodiment. The lower sound absorbing chamber 3, the upper sound absorbing chamber 4, and the upper sound absorbing duct 5 are housed in a soundproof box, and their appearance is no different from that of a normal soundproof type generator.

The operation of this embodiment having the above-described structure will be described below. In FIG. 1, the air sucked by the air cleaner 14 has an intake hole 16 provided in the side cover 15.
Is sucked into the upper sound absorbing duct 5 and flows into the upper sound absorbing duct 5, while the air is largely reversed in the intake hole 7, the air velocity is increased in the intake hole 9 to flow into the lower sound absorbing chamber 3, and the air flows to the air cleaner 14 through the flexible duct 13. In the process of flowing from the suction hole 16 to the lower sound absorbing chamber 3, the flow of air has a low flow velocity in the upper sound absorbing duct 5, is fast when passing through the intake hole 7, and is slow in the upper sound absorbing chamber 4 when passing through the suction hole 9. fast,
Then, since it becomes slow in the lower sound absorbing chamber 3, the air flow becomes a turbulent flow, and the dust contained in the air is separated and removed by the upper sound absorbing duct 5, the upper sound absorbing chamber 4, and the lower sound absorbing chamber 3, and the side Since the suction hole 16 provided in the cover 15 is located at a high position, the mixing of dust into the air is reduced.

Further, as in the present embodiment, the air flow is largely reversed at the intake hole 7 and the flow velocity is increased at the intake hole 9 so that the air flows into the lower sound absorbing chamber 3, whereby the separation efficiency of dust in the air is increased. Can be further improved. On the other hand, since the flow velocity of the air flowing into the upper sound absorbing duct 5 from the suction hole 16 provided in the side cover 15 is softened by the upper sound absorbing duct 5, the flow velocity of the air passing through the suction hole 16 becomes slow and There is almost no generation of suction noise.
Further, between the suction hole 16 and the opening of the flexible duct 13, an air flow path is formed by the upper sound absorbing duct 5, the upper sound absorbing chamber 4, and the lower sound absorbing chamber 3, so that air flows along this air flow path. The generation of suction noise is reduced by the flow, and even if some suction noise is generated in the air flow path, the suction noise does not leak to the outside.

Further, since the air flow path from the suction hole 16 to the air cleaner 14 is sealed, there is no invasion of the high temperature air in the soundproof box into this air flow path, and the temperature sucked from the suction hole 16 It becomes possible to supply only the outside air having a low air pressure to the engine 1. In this embodiment, the suction hole 16 is provided in the side cover 15
However, the same effect can be obtained by providing the front cover 10 or both the front cover 10 and the side cover 15.

[0018]

As described above in detail, according to the present invention, the lower sound absorbing chamber formed with a certain gap between the engine base, the upper sound absorbing chamber formed on the lower sound absorbing chamber, and the further sound absorbing chamber. The upper sound-absorbing duct formed on the upper sound-absorbing chamber is sealed with a side cover and a front cover, and it is used as a partition between the lower sound-absorbing chamber and the upper sound-absorbing chamber and a partition between the upper sound-absorbing chamber and the upper sound-absorbing duct, respectively. In addition to the intake holes, the side cover or front cover has a side surface with an intake hole communicating with the upper sound absorbing duct, and the lower sound absorbing chamber and the air cleaner are connected by a flexible duct. The upper sound absorption duct, the air intake hole opened on the floor, the upper sound absorption chamber, the air intake hole opened on the floor, the lower sound absorption , It is possible to form an air flow path for guiding the air cleaner via the flexible duct.

As a result, the mixing of dust into the air flowing in the air flow path is reduced, the output of the engine is maintained for a long period of time, and the service life of the air cleaner can be greatly extended. Generation of suction noise is reduced by the air flowing along the air flow path.
Even if some suction sound is generated, it is possible to reduce the leakage of the suction sound to the outside.

Further, since the lower sound absorbing chamber and the air cleaner are connected by the flexible duct, the problem of vibration is solved, and only the outside air having a low temperature is sucked from the suction hole provided in the side cover or the front cover. As a result, it is possible to prevent the engine output from decreasing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the overall appearance of an embodiment of the present invention.

FIG. 3 is a front view of a soundproof type generator equipped with the embodiment of FIG.

FIG. 4 is a plan view showing a main part of FIG.

[Explanation of sign]

 2 Engine base 3 Lower sound absorbing chamber 4 Upper sound absorbing chamber 5 Upper sound absorbing duct 6 Floor plate 7 Air intake hole 8 Floor plate 9 Air intake hole 10 Front cover 13 Flexible duct 14 Air cleaner 15 Side cover 16 Air intake hole

Claims (1)

[Claims] 1. A lower sound absorbing chamber is provided with a fixed gap between the engine base, an upper sound absorbing chamber is formed on the lower sound absorbing chamber, and an upper sound absorbing duct is formed on the upper sound absorbing chamber. The lower sound absorbing chamber, the upper sound absorbing chamber, and the upper sound absorbing duct are provided with intake holes in the partition floor between the lower sound absorbing chamber and the upper sound absorbing chamber and the partition floor between the upper sound absorbing chamber and the upper sound absorbing duct. Is sealed with a side cover and a front cover, and a suction hole communicating with the upper sound absorbing duct is provided on the side surface of the side cover or the front cover.
An intake device for a soundproof type generator, wherein the lower sound absorbing chamber and the air cleaner are connected by a flexible duct.