JP3038507B2 - Engine soundproof case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof case for covering an engine or an engine and a working machine such as a generator or a welding machine.

[0002]

2. Description of the Related Art In a soundproof type engine in which an engine is disposed in a soundproof case to reduce engine noise, the soundproof case is partitioned by an intermediate wall to form an exhaust duct, and cooling is performed through the exhaust duct. Exhaust air is discharged to the outside. Usually, an exhaust muffler is arranged in the exhaust duct to cool the muffler by the exhaust air, and by providing such a duct between the exhaust outlet of the exhaust air and the engine room, engine noise is reduced. Is prevented from being transmitted to the outside as much as possible. For example, Japanese Utility Model Publication No. 63-47616 discloses that
A box-shaped duct partitioned by such an intermediate wall is provided in the upper part of the soundproof case, an exhaust muffler is arranged in this duct, and the engine cooling exhaust air is introduced into this duct, and then the side wall of the soundproof case is Which is configured to be discharged from a discharge port formed in the above-mentioned publication. On the other hand, Shokai 6
Japanese Patent Application Laid-Open No. 2-203939 discloses a case in which a box-shaped duct independent of a soundproof case is installed in a case, and a pre-muffler and a main muffler are arranged in an L-shape in the duct. ing.

[0003]

However, each of the above-mentioned conventional exhaust ducts is only formed in a simple box shape, and the duct length is short for the volume of the duct, so that the effect of reducing noise is reduced. It has the disadvantage of being small. Also,
Increasing the volume of the duct increases the sound absorbing effect as the surface area increases, but this has the disadvantage that the entire duct becomes large and the entire case cannot be made compact. In particular, in the latter case where the pre-muffler and the main muffler are arranged in the same duct, there is a disadvantage that an unnecessary space is generated in the duct and the duct becomes very large.

That is, an object of the present invention is to provide a structure of a soundproof case in which such a discharge duct is provided, which has a large noise reduction effect and can be made compact as a whole. .

[0005]

In order to solve the above-mentioned problems, the invention of the present application is to form an exhaust duct divided by an intermediate wall in a box-shaped sound-insulating case that covers an engine, and the inside of the sound-insulating case. In a soundproof case where the cooling exhaust air is exhausted through the exhaust duct, the exhaust duct
Side wall surface facing the engine body and work machine
The length spans between them, and partitions the inside of the exhaust duct up and down
Horizontal walls and vertical walls that partition horizontally
The exhaust duct from the horizontal part and the vertical part
It is characterized by having an inverted L-shape .

Further, the second invention of this application is the first invention.
The present invention is characterized in that auxiliary equipment such as a battery or a reactor of a welding machine is arranged in a space inside the soundproof case surrounded by the bending of the exhaust duct.

[0007]

According to the above construction, since the exhaust duct is bent in an inverted L-shape, the length and surface area of the duct are larger than the volume and the noise reduction effect is increased. In addition, by arranging the pre-muffler and the main muffler in an L-shape along the bend in the duct, the two mufflers can be arranged without generating unnecessary space. Furthermore, since the auxiliary equipment is arranged in the space surrounded by the bending, the space around the engine body can be effectively used, and the whole can be compactly stored.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 to 4 showing an embodiment of the present invention, reference numeral 1 denotes a box-shaped soundproof case, and the soundproof case is formed by an intermediate wall 2 arranged in the soundproof case 1 in a vertical direction. The interior of the case 1 is divided into an engine room 3 and an exhaust duct 4 on the left and right. In the one engine room 3 partitioned on the left and right, an engine body 5 and a generator 6 as a working machine driven by the engine body 5 are installed side by side in the crankshaft direction. The exhaust duct 4 is used to
The sides facing each other in the direction in which the engine body 5 and the generator 6 are arranged
The length spans between the walls 8 and 16. Similarly, a fuel tank 7 is arranged above the generator 6 in the engine room 3. On one side wall 8 in the front-rear direction of the soundproof case 1 which is on the side of the generator 6 in the crankshaft direction, a cooling air intake 9 is opened so as to face the generator 6. A U-shaped baffle plate 10 is fixed so as to protrude from the side wall 8 so as to protrude from the side wall 8 so as to surround the lower side and the left and right outer sides of the cooling air intake 9 and further cover the baffle plate 10 and the intake 9. Thus, an air duct 11 having an open lower end is attached. The cooling air flowing upward from the inlet 12 at the lower end of the air duct 11 rises along the left and right sides of the baffle plate 10 and then rises.
An inverted U-shaped cooling air intake passage is formed so as to flow downward from the upper open portion and flow into the intake port 9 side, so that noise in the engine room 3 is not discharged to the outside as much as possible. It has a simple structure. A mounting plate 13 is provided below the cooling air intake 9 so as to straddle the engine room 3 and the baffle plate 10, and the reactor 14 of the welding machine 7 is mounted on the mounting plate 13. It is mounted so as to protrude outward from the engine room 3.

On the side wall 16 of the soundproof case 1 on the side opposite to the cooling air intake 9, the intake intake duct 1 faces the cylinder head 17 of the engine body 5.
8 are attached. 19 is the cylinder head 1
7, an air cleaner 20 at the end of the intake pipe 19 is arranged to be connected to the intake intake duct 18.

The intermediate wall 2 is not a plate that simply divides the soundproof case 1 into right and left parts, but is formed by cutting out the lower right corner of the engine body 5 in FIG. A vertical wall 23 and a horizontal ceiling wall 24 are connected across the end of the notch and the side wall 22 of the soundproof case 1, which is the outer wall of the exhaust duct 4.
Thus, by notched the exhaust duct 4 to a square, and Rutotomoni horizontal portion such as the exhaust duct 4 is upper corners
A battery 26 is installed via a mounting base 27 in an engine room enlarged portion 25 recessed by the above-mentioned notch while having a substantially inverted L-shape formed of a vertical portion connected to the battery. As shown in FIG. 4, the mounting base 27 has an L-shaped cross section that straddles the side wall 22 and the bottom wall 28 at the lower end corner in the left-right direction of the soundproof case 1. 28 compartmented space is formed between the engine room 3 between, in this space, and an auxiliary inlet 29 of the cooling air to the bottom wall 28, on the other hand, in the front and rear side of the battery 26, the mounting base 27 Outlets 30 are respectively formed in the upper wall portions of
Cooling air is taken in from the auxiliary inlet 29, and a pair of outlets 3
A duct 31 for taking in auxiliary cooling air from 0 and 30 to the periphery of the battery 26 is formed.

In the exhaust duct 4, a pre-muffler 33 is disposed in the front and rear horizontal direction above the ceiling wall 24 above the battery 26, and extends from the upper wall 34 to the bottom wall 28 of the soundproof case 1. Main muffler 3 in a large space
5 and its main muffler 3
5 is connected to an outlet on the side of the prim muffler 33 by a connecting pipe 36. The exhaust pipe 37 connected to the outlet at the lower end of the main muffler 35 is bent in a key shape and rises upward, and extends upward through a side of the main muffler 35 opposite to the side of the pre-muffler 33. After being issued,
It projects above the upper wall 34 of the soundproof case 34.
On the other hand, after the exhaust inlet pipe 38 connected to the inlet side of the prim muffler 33 is bent in a key shape and extended toward the main muffler 35 along the lower side of the prim muffler 33,
Further, it is bent into an L shape, penetrates the intermediate wall 2, and is connected to a cylinder head 17 of the engine body 5 in the engine room 3.

On the other hand, a scroll-shaped discharge duct 39 surrounding the cooling fan of the engine body 5 on the side opposite to the generator 6 is provided on the ceiling wall 24 of the enlarged portion 25 on the side of the battery 26 of the enlarged portion 25. Contact 4 formed
0 from the scroll-shaped duct 39 to the exhaust duct 4.
I try to introduce it inside. The exhaust air flowing into the exhaust duct 4 first flows around the pre-muffler 33 to cool the pre-muffler 33, and is bent in an L-shape to cool the main muffler 35. 4
Outlets 41 formed in the side wall 22 of the soundproof case surrounding the
It is designed to be released to the outside. The pre-muffler 33 and the main muffler 35 have an elliptical cross section whose width is reduced with respect to the partitioning direction of the intermediate wall, so that the width of the soundproof case 1 in this direction can be made as small as possible. The pre-muffler 33 is used to remove harsh low noise that cannot be cut by the main muffler 35.

In this embodiment, the battery 26 is disposed in the enlarged portion 25, which is a space surrounded by the L-shaped bend of the exhaust duct 4, but is provided in other auxiliary equipment such as the cooling air intake 9. The reactor 14 may be arranged in place of the battery 26.

[0014]

According to the present invention, the exhaust duct provided in the soundproof case is arranged in the direction in which the engine body and the working machine are arranged.
The length of the duct and the surface area are larger than the volume, and the noise reduction effect is also increased because the duct is bent in an inverted L-shape with a length extending between the facing case side walls . In addition, by arranging the pre-muffler and the main muffler in an L-shape along the bend in this duct, the two mufflers can be arranged without generating unnecessary space, and despite the large noise reduction effect, A compact soundproof case can be obtained as a whole. On the other hand, in the second invention of this application, since accessories such as a battery are arranged in the space surrounded by the bending of the duct, the dead space formed by the formation of the discharge duct can be effectively reduced. As a result, a more compact soundproof case can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view in an engine room, showing a soundproof case in a longitudinal section.

FIG. 2 is a plan view of the inside of an engine room, also showing the soundproof case in a cross-section.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an overall perspective view of an arrangement structure of an engine body, a generator, and the like.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Soundproof case 2 Intermediate wall 3 Engine room 4 Exhaust duct 5 Engine main body 6 Generator 8 Soundproof case side wall 14 Reactor 16 Soundproof case side wall 25 Engine room expansion part 26 Battery 33 Prim muffler 35 Main muffler

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-216021 (JP, A) JP-A-2-92038 (JP, U) JP-A-1-125817 (JP, U) JP-A-1 160131 (JP, U) Japanese Utility Model 1-124047 (JP, U) Japanese Utility Model 3-8627 (JP, U) Japanese Utility Model 4-8724 (JP, U) (58) Fields surveyed (Int. ⁷ , DB name) F02B 77/13 F02B 63/04

Claims (2)

(57) [Claims] 1. A soundproof case in which an exhaust duct divided by an intermediate wall is formed in a box type soundproof case covering an engine, and cooling exhaust air in the soundproof case is discharged through the exhaust duct. The exhaust duct is engineered in a soundproof case.
Between the side walls facing each other in the direction in which the
And the horizontal direction that separates the inside of the exhaust duct up and down
Vertical walls separating the wall and the horizontal
And the inverted L-shape consisting of a horizontal part and a vertical part
The engine's soundproof case. 2. A soundproof case for an engine according to claim 1, wherein an auxiliary device such as a battery or a reactor of a welding machine is disposed in a space inside the soundproof case surrounded by the bending of the exhaust duct.