Acoustics – Sound-modifying means – Housing or enclosure
Reexamination Certificate
2001-02-23
2002-12-10
Dang, Khanh (Department: 2837)
Acoustics
Sound-modifying means
Housing or enclosure
C181S204000, C180S069220, C123S1950HC
Reexamination Certificate
active
06491133
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a soundproof type engine driven work machine (hereinafter referred to as work machine), and more particularly relates to a construction of introducing the cooling air into a soundproof casing accommodating an engine driven work machine unit.
2. Prior Art
A work machine unit accommodated within a soundproof casing has been conventionally used to reduce uncomfortable noise. A soundproof type engine driven generator (hereinafter referred to as generator) is explained as a typical example of this kind of work machines.
As shown in
FIG. 1
, main part of the generator comprises a generator unit G″ as a work machine unit, an engine E″ of which rear end power axis is communicated to the generator unit G′, a muffler M″ connecting to the engine E″, an air-cooled type inter-cooler I″ acting as a charge cooler, and a radiator R″. An engine fan F″ is directly provided to the front end of said engine E″ and driven by said engine E. Directly opposite to said engine fan F″ the inter-cooler I″ and the radiator R″ are aligned in consecutive order from right to left in FIG.
1
. All abovementioned parts are accommodated in a soundproof casing K″ to reduce uncomfortable noise. There are provided an air intake aperture
31
a
″ on the rear side of said soundproof casing K and an air exhaust aperture
25
a
″ on the ceiling at front side.
While said generator being driven, the heat generated from the generator unit G″, the engine E″, the inter-cooler I″, the radiator R″ and the muffler M″ is cooled by the cooling air flowing through the soundproof casing K. The cooling air is introduced into the soundproof casing K through the air intake aperture
31
a
″ by rotating the engine fan F″. The cooling air passes through an air flow passage formed in the soundproof casing K consecutively as cooling the generator unit G″, the engine E″, the inter-cooler I″, the radiator R″ and the muffler M″ and is exhausted through the exhaust aperture
25
a.
However, it has been pointed out that the cooling air is warmed up because it goes through the intake aperture
31
a
″, the generator unit G″, the engine E″, the inter-cooler I″, the radiator R″ and the muffler M″ while passing through the soundproof casing K, the cooling air is warmed up by the heat of the air already cooled the aforementioned apparatuses. As the cooling air approaches the exhaust aperture
25
a
said cooling air to cool the inter-cooler I″, the radiator R″ and the muffler M″ is already warmed up. Thus, the cooling efficiency is much reduced.
In order to overcome such undesirable efficiency reduction it is naturally required to supply more additional cooling air into the soundproof casing K so that the cooling air may cool the inter-cooler I″, the radiator R″ and the muffler M″ sufficiently. In other word, it was required to enlarge the areas of the intake aperture
31
a
″ and the exhaust aperture
25
a
″ or expand the capacities of the radiator R″, the inter-cooler I″ and the engine fan F″.
In the meantime, the conventional generator in which the inter-cooler I″ and the radiator R″ are provided opposite to the engine fan F″ is pointed out that the combustion sound of the engine E″ or the machine sound (hereinafter referred to as engine sound) which is the main cause of the engine sound is leaked outside through the air intake aperture
31
a
″ or the air exhaust aperture
25
a
after passing through the core part of the radiator R″.
For this reason, if the area of the air intake aperture
31
a
″ or the air exhaust aperture
25
a
″ should be enlarged, the engine sound during the operation of the generator is accordingly much enlarged. Meanwhile, if the capacities of the inter-cooler I″ and the radiator R″ are enlarged, a more larger inter-cooler I″ and a more larger radiator R″ are required and thus the dimension of the core part is enlarged and the engine sound passing through the said core part becomes larger. The engine sound becomes larger more and more. This is a big problem of the engine sound.
In the meantime, to reduce the leakage of the noisy sound from the soundproof casing K″, it is required to reduce the areas of the aperture of the air intake aperture
31
a
″ and the air exhaust aperture
25
a
″. Further it is required to provide an element to shut the transmission of the noisy sound in the cooling air passages in the casing K or to provide some bending parts in the passages to obstruct the pressure is also required. However, against such construction, it is pointed out that the volume of the cooling air is reduced and cooling efficiency at each apparatus is reduced.
Accordingly, improving the cooling efficiency and reducing the noisy sound at each apparatus conflict with each other.
Furthermore, if the volumes of the inter-cooler I″, the radiator R″, the engine fan F, etc. are enlarged, the configuration dimension of the soundproof casing K which accommodates these apparatuses is accordingly enlarged. This will be in conflict with the concept that the size of the generator should be small.
SUMMARY OF THE INVENTION
The present invention has been made with the foregoing background in mind. The object of the present invention is to offer a soundproof type engine driven work machine to improve the cooling efficiency and reduce the noise.
In order to resolve the foregoing detects, the soundproof type engine driven work machine according to the present invention is provided with an engine with an engine fan, a work machine unit driven with said engine, a radiator connected to the engine, a charge cooler and the muffler. These apparatuses are accommodated in the soundproof casing. The soundproof casing is divided to an engine room, a muffler room and a radiator room in which said engine as well as said work machine unit being housed in the engine room, said muffler being housed in said muffler room and said radiator being housed in said radiator room. Said engine room is provided with the air intake aperture, said muffler room being provided with the air exhaust aperture, said radiator room being provided with the air intake aperture, respectively. Said radiator room and said muffler room are communicated each other. An electric fan is provided between said air intake aperture in the radiator room and said radiator. Further, an air flow duct is provided between said engine room and said muffler room. The engine fan is provided directly opposite to an inlet of the air flow duct. In the air flow duct there is provided said charge cooler. This is the main characteristic of the soundproof type engine driven work machine according to the present invention.
The charge cooler indicates an apparatus to cool the air for combustion the engine which has been supercharged by compression. It indicates an inter-cooler or an after cooler apparatuses.
The air intake aperture and the air exhaust aperture formed in each room introduces and exhausts the air through each aperture, respectively.
Accordingly, the soundproof casing is divided to the engine room, the muffler room and the radiator room. The engine room encloses the engine and the work machine unit, the muffler room encloses the muffler and the radiator room encloses the radiator, respectively. The radiator room is provided with the electric fan and the air flow duct is provided with the air-cooling apparatus. Thus, cooling efficiency for the apparatus in each room is greately improved.
In radiator room, a clear non-heated air introduced from outside through the air intake aperture by means of electric fan is used for cooling said electric fan and the cooling air only used for cooling the electric fan is used for cooling the radiator. Thus cooling efficie
Torii Susumu
Yamada Masao
Dang Khanh
Denyo Co. Ltd.
LandOfFree
Soundproof type engine driven work machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Soundproof type engine driven work machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Soundproof type engine driven work machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2949110