JPH0868323A - Sound-proofing engine working machine - Google Patents

Abstract

PURPOSE: To form the whole of a device in a compact size by reducing a noise level to the possible minimum level in a working machine with an engine such as a power generator with an engine. CONSTITUTION: A part of a noise-proof case for constituting the outer circumference of a noise-proof type engine working machine is formed in a double wall structure so as to prevent leakage of noise of engine provided in the inside of the noise-proof type engine working machine. And also, the part of the double wall structure is constituted in an engine room (A), a radiator chamber (B), and an exhaust muffler chamber (F) so as to eliminate leakage of noise from respective chambers. A fan 1 for conditioning an inner room and an electrically or hydraulically driven fan G are driven independently without driving from an engine (E) so as to free its drive and constitute the whole of the sound-proof type engine working machine in a compact size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof construction of a soundproof engine working machine in which an engine and a generator are arranged inside a soundproof case.

[0002]

2. Description of the Related Art Conventionally, a technology related to a soundproof engine working machine has been known. For example, the actual Kosho 5
6-2077, Japanese Utility Model Laid-Open No. 1-1258818, Japanese Patent Laid-Open No. 64-56911, and Japanese Utility Model Laid-Open No. 1-25.
For example, Japanese Laid-Open Patent Application No. 3525 and Japanese Utility Model Laid-Open No. 61-120029.

[0003]

SUMMARY OF THE INVENTION In the conventional soundproof engine working machine, the present invention considers the arrangement of an internal engine, a radiator, an exhaust silencer, etc., to make a compact and compact structure, and further, a soundproof case. It is configured to reduce the noise emitted from the outside.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. In claim 1, the soundproof case C of the soundproof engine working machine is divided into an engine room A, a radiator room B, and an exhaust silencer room F, and the engine room A is provided with a fan 1 for indoor ventilation. An electric or hydraulically driven fan G is arranged in the chamber B.

According to a second aspect of the present invention, in the soundproof engine working machine, the exhaust silencer M is provided above the engine room A.
And the both side wall portions of the soundproof case C in the engine room A are double-walled.

According to the third aspect of the present invention, in the soundproof engine working machine, the radiator R is arranged inside the radiator chamber B, and the radiator R is obliquely arranged so that its upper side is inclined toward the engine E side.

According to a fourth aspect of the present invention, in the soundproof engine working machine, the cooling air in the radiator chamber B and the indoor ventilation fan 1 are merged on the upper surface of the soundproof case C and exhausted.

According to a fifth aspect of the present invention, in the soundproof engine working machine, a part of the cooling air introduced into the radiator chamber B is introduced into the engine room A.

According to a sixth aspect of the present invention, in the soundproof engine working machine, the cooling air is sucked from the cooling air intakes 18 on both sides of the soundproof case C by the rotation of the indoor ventilation fan 1.
The suction cooling air is configured to cool the engine supercharger N in the engine room A.

According to a seventh aspect of the present invention, in the soundproof engine working machine, the indoor ventilation fan 1 is provided above the soundproof case C at the boundary between the engine room A and the exhaust silencer room F to provide the indoor ventilation fan. 1 is inclined and the air in the engine room A is discharged to the exhaust silencer M inside the exhaust silencer chamber F.

According to the present invention, in the soundproof type engine working machine, the exhaust silencer chamber F is formed above the soundproof case C, and the exhaust silencer M is arranged in the exhaust silencer chamber F. The support stand of the exhaust silencer M also serves as an exhaust guide plate.

[0012]

Next, the operation will be described. According to claim 1, the interior of the soundproof case C of the soundproof engine working machine is divided into an engine room A, a radiator room B, and an exhaust silencer room F, and the engine room A is provided with an indoor ventilation fan 1. Since an electric or hydraulic drive fan G is arranged in the radiator chamber B,
Since the interior of the soundproof case C is completely divided, the vibration noise of the engine E is less likely to leak out of the soundproof case C. Further, by dividing each part into separate rooms, the arrangement intervals of the respective devices can be narrowed and arranged, and a soundproof engine working machine that is compact as a whole can be obtained.

According to the second aspect, the exhaust silencer M is arranged in the upper part of the engine room A, and both side wall portions of the soundproof case C in the engine room A are double walls. Since it is possible to arrange a double wall portion in each room, it is possible to make the entire circumference into a double wall together with the double walls of other portions around the engine E, and it is possible to reduce the noise level. done.

According to the third aspect, since the radiator R is arranged inside the radiator chamber B, and the radiator R is arranged obliquely so that the upper side thereof is inclined toward the engine E side, the radiator is directed vertically toward the rear wall. As in the case of the arrangement, the space for diverting the discharge air upward is not required, and the length of the soundproof case C in the longitudinal direction can be shortened. Further, it is possible to reduce the cooling air loss of the discharge air discharged from the electric or hydraulically driven fan G.

According to the fourth aspect, the cooling air in the radiator chamber B and the indoor ventilation fan 1 are merged on the upper surface of the soundproof case C and exhausted, so that the upper exhaust port 7 of the indoor ventilation fan 1 is exhausted. , The electric or hydraulically driven fan G can also be used as an exhaust port, and it is not necessary to separately provide an upper exhaust port. Further, since the temperature of the cooling air of the indoor ventilation fan 1 and the electric or hydraulically driven fan G is low even after cooling the engine E and the radiator R, the cooling air is efficiently applied to the exhaust silencer M by applying the cooling air to the exhaust silencer M. The exhaust silencer M can be cooled.

According to the fifth aspect, a part of the cooling air introduced into the radiator room B is introduced into the engine room A, so that the radiator room B also serves as a muffling room. The leakage of noise from the radiator room B
At, you can mute again. Also,
By introducing the cooling air from the radiator room B into the engine room A, the cooling air can be effectively used.

According to the sixth aspect, the rotation of the indoor ventilation fan 1 sucks the cooling air from the cooling air inlets 18 on both sides of the soundproof case C, and the sucked cooling air is the engine room A.
Since the engine supercharger N in the inside is configured to be cooled, the engine supercharger N itself can be stored inside the soundproof case C and cooled by the suction air of the indoor ventilation fan 1. Since it is not necessary to dispose only the engine supercharger N outside the soundproof case C and provide a separate cooling mechanism as in the conventional case, noise of the engine supercharger N is prevented from leaking to the outside.

According to claim 7, the indoor ventilation fan 1
Is provided in the upper part of the soundproof case C at the boundary between the engine room A and the exhaust silencer chamber F, the indoor ventilation fan 1 is tilted, and the exhaust silencer M inside the exhaust silencer chamber F is
Since it is configured to discharge the air in the engine room A, even the large indoor ventilation fan 1 can be lowered in height by arranging it diagonally, so that the overall height of the soundproof case C can be reduced. I was able to lower it. Further, since the exhaust silencer M can be cooled by the air discharged from the indoor ventilation fan 1, the cooling efficiency of the exhaust silencer M can be improved.

According to the eighth aspect, the exhaust silencer chamber F is formed in the upper part of the soundproof case C, and inside the exhaust silencer chamber F,
Since the exhaust silencer M is disposed and the support of the exhaust silencer M also serves as the exhaust air guide 2, the cooling air from the indoor ventilation fan 1 is electrically connected to the exhaust air guide 2 at the portion of the exhaust air guide 2. Both of the cooling winds from the hydraulically driven fan G can be turned upward, and the cooling winds can be smoothly discharged without colliding with each other. Further, since the exhaust guide 2 also serves as a mounting table for the exhaust silencer M, it is not necessary to separately provide a mounting table for the exhaust silencer M.

[0020]

EXAMPLES Next, examples will be described. 1 is an overhead view of a soundproof engine working machine of the present invention, FIG. 2 is a side sectional view of the same soundproof engine working machine of the present invention, FIG. 3 is a plan sectional view of the same soundproof engine working machine, and FIG. 4 is the same. FIG. 5 is a front sectional view of the soundproof engine working machine, FIG. 6 is a rear sectional view of the same radiator R, and FIG. 7 is an upper lid 6 of the soundproof case C. And a perspective view with the exhaust silencer M removed, FIG. 8 is an exploded view showing a mounting mechanism of the battery 20, and FIG. 9 is divided into an engine room A, a radiator room B, and an exhaust silencer room F. FIG. 10 is a side view showing a configuration, and FIG. 10 is a side view showing a configuration in which the indoor ventilation fan 1 is obliquely arranged.

FIG. 11 is a drawing showing the arrangement of the fuel tank T,
FIG. 12 is a side view showing a configuration in which an exhaust air guide 13 is provided at a confluence portion of discharge air of the electric or hydraulically driven fan G and the indoor ventilation fan 1, and FIG. 13 is an indoor ventilation system for the exhaust silencer M of the center frame 10. FIG. 14 is a side view showing the configuration in which the fan 1 is arranged, FIG. 14 is a side view showing the configuration in which a cooling air guide plate 14 is provided in the exhaust silencer M of the engine room A and the radiator room B, and FIG. FIG. 16 is a plan view, FIG. 16 is a side view showing a configuration in which an electric or hydraulic drive fan G and a radiator R are obliquely arranged, FIG. 17 is a side view showing a configuration in which an auxiliary air outlet 15 is provided, and FIG. 18 is an exhaust silencer M. It is a side view which shows the structure in which a support base also serves as the exhaust guide 2.

This will be described with reference to FIGS. 1 and 7. The surroundings of the soundproof engine working machine are covered with a soundproof case C,
The noise from the engine E arranged inside is configured not to leak outside. On the front and rear side walls of the soundproof case C, double side plates 9 with double doors are fitted as opening / closing lids. In addition, on the upper part of the soundproof case C, the exhaust silencer M
Is formed, and the upper cover 6 covers the opening. An upper air outlet 7 is formed in the upper lid 6. As shown in FIG. 7, an exhaust silencer M is arranged inside the exhaust silencer chamber F, and a fan fixing for fixing the indoor ventilation fan 1 is provided at a boundary portion between the exhaust silencer chamber F and the engine room A. A plate 8 is provided.

As shown in FIG. 1, cooling air intakes are opened in each part of the soundproof case C. The cooling air intake 16 and the cooling air intake 18 suck the cooling air into the engine room A by the rotation of the indoor ventilation fan 1. Further, the cooling air intake 17 has an electric or hydraulically driven fan G in the radiator chamber B.
The cooling air is taken in by the rotation of.

2 to 7, the overall construction of the soundproof engine working machine of the present invention will be described. Soundproof case C
Inside, the engine E and the generator D integrally formed are arranged below. A radiator R is arranged on the opposite side of the generator D of the engine E, and the radiator R is driven by an electric or hydraulically driven fan G. An electric control panel K is arranged above the generator D, and a fuel tank T is further arranged. Further, the indoor ventilation fan 1 is arranged at a position above the engine E. Further, two exhaust silencers M are arranged above the engine E and the radiator R. The exhaust passages of the two exhaust silencers M are connected in series, and when they are arranged, they are arranged in parallel as shown in FIG.

As shown in FIG. 2, inside the soundproof case C, an engine room A in which an engine E and a generator D are arranged, a radiator room B in which an electric or hydraulic drive fan G and a radiator R are arranged, and exhaust muffling. It is configured in the exhaust silencer chamber F in which the container M is arranged. An indoor ventilation fan 1 is arranged in an exhaust silencer M between the engine room A and the exhaust silencer room F. Since the indoor ventilation fan 1 is driven by an electric motor, it is not necessary to transmit power to the engine E. Further, a partition plate 4 is provided between the engine room A and the radiator room B, and inside the radiator room B, an electric or hydraulically driven fan G and a radiator R are arranged. The partition plate 4 is provided with an opening so that the cooling air in the engine room A can be discharged into the radiator chamber B. A partition plate 3 is provided between the exhaust silencer chamber F and the engine room A.

As shown in FIGS. 4 and 5, the engine room A
Double side plates 9 are provided on the front and rear side walls of the
From engine room A, which is a particularly noisy area,
It prevents the leakage of noise. As shown in FIG. 6, the engine E
The exhaust gas from the exhaust gas passes through two exhaust silencers M connected in series and is discharged to the exhaust pipe 5, and the end of the exhaust pipe 5 is a portion of the upper exhaust port 7 provided in the upper lid 6. It is open to. The exhaust silencer M is composed of vertically thin elliptical pipes so that it can be arranged in a narrow space above the soundproof case C. Both the exhaust air from the indoor ventilation fan 1 and the exhaust air discharged from the radiator chamber B by the electric or hydraulic drive fan G flow into the exhaust silencer chamber F in which the exhaust silencer M is arranged, The wind guide 2 is configured so that the exhaust air from both is discharged toward the upper exhaust port 7 provided in the upper lid 6.

Therefore, the exhaust silencer M is the indoor ventilation fan 1
The air is cooled by the exhaust air from both the electric fan and the hydraulically driven fan G. Then, the exhaust air after cooling the exhaust silencer M is guided upward by the exhaust guide 2 and is discharged to the atmosphere from the upper exhaust port 7. In order that the exhaust silencer M can be easily taken out from the exhaust silencer chamber F, the upper lid 6 that covers the opening provided in the upper portion of the soundproof case C is configured to be detached with one touch. The soundproof case C
By installing a large opening in the two exhaust muffler M
Is easy to assemble.

The soundproof engine working machine of the present invention is
The entire surface of the soundproof case C is closed by a substantially double wall. That is, on the upper surface of the soundproof case C, the fuel tank T and the exhaust silencer chamber F form a double wall. Further, the rear surface is constituted by a radiator chamber B into a double chamber. Further, the front side is constituted by a double wall by an electric control panel K. Further, by arranging the soundproof wall 11 upright under the fuel tank T as shown in FIG. 11, a double wall can be formed below the electric control panel K. The front and rear side walls of the soundproof case C are closed by four double side plates 9. The bottom is closed by a bottom double wall U. This makes it possible to form a double wall around the engine E, which is the loudest, so that the noise level can be reduced.

Further, as shown in FIG. 4, the battery 20 is arranged laterally of the generator D at a position where a window provided in the double side plate 9 is opened. The battery 20 has a double side plate 9
It is necessary to insert it in a narrow space with the window of the part open, and it is difficult to insert and remove. Therefore, as shown in FIG. 8, the battery mounting table 21 has a structure in which the front end is rotatable up and down about the pivot shaft 24. Then, the tip of the battery mounting table 21 is configured to be locked by a locking pin 23 that is movable back and forth in a long hole opened in the fixed mounting table 22. And the battery mounting table 21
When the front end of the battery mounting table 21 is rotated upward with the battery 20 mounted thereon, and the locking pin 23 is moved below the battery mounting table 21, the front end of the battery mounting table 21 moves. The stop hook portion 25 is configured to engage with the locking pin 23 to prevent further downward rotation of the battery mounting table 21.

Therefore, when removing the battery, the battery mounting table 2
By raising the front end of the portion 1 and pulling the locking pin 23 toward you, the battery mounting table 21 is inclined downward, and in this state, the battery 20 can be taken out downward. At this time, the locking pin 23 functions as a roller under the battery 20,
It is easy to take out.

As shown in FIGS. 2 and 4, the engine E
The engine supercharger N is arranged in the circuit of the exhaust pipe at the upper part of. The indoor ventilation fan 1 is arranged above the engine supercharger N, and is configured to cool the engine supercharger N with cooling air that has cooled the periphery of the engine E.

Further, in the present invention, the radiator chamber B
The radiator R and the electric or hydraulically driven fan G disposed inside the engine are configured such that the upper side is inclined toward the engine E side. Conventionally, the radiator R and the electric or hydraulic drive fan G are arranged vertically, but when they are vertically arranged as in the conventional case, the discharge is surely performed between the radiator R and the rear wall. Although a space is required for the wind to change its direction upward, this space can be eliminated by inclining the upper part of the radiator R toward the engine E as in the present invention. Therefore, the lower end of the radiator R is
The length of the soundproof case C can be shortened because the soundproof case C can be brought into contact with the rear wall of the soundproof case C.

Further, in the present invention, the indoor ventilation fan 1 is also configured to be driven by an electric motor, and further, the radiator R which is conventionally driven by the engine E is used.
The electric or hydraulically driven fan G is also configured to be driven by an electric motor. In this way, by adopting the structure of being driven by the electric motor, there are no restrictions on the mounting positions of the indoor ventilation fan 1 and the electric or hydraulically driven fan G, and the radiator R can be easily inclined.

As shown in FIG. 2, an exhaust guide 2 is arranged on the upper surface of a partition plate 3 which constitutes the exhaust silencer chamber F, and the exhaust guide 2 also serves as a mounting table for the exhaust silencer M. There is. Further, the cooling air from the indoor ventilation fan 1 and the cooling air from the electric or hydraulically driven fan G are configured to be merged in the exhaust silencer chamber F, and the cooling wind after the merging is the upper exhaust gas. An exhaust guide 2 is provided to guide the cooling air upward so that the air can be easily discharged from the air outlet 7.

Further, the exhaust pipe 5 is constructed so that, after exiting from the exhaust silencer M, it once constitutes a U-shaped pipe downward, then bends upward again and discharges from the upper exhaust port 7. A rainwater drainage hole that has penetrated into the exhaust pipe 5 is provided at the lower end of the U-shaped pipe portion.

[0036]

Since the present invention is configured as described above, it has the following effects. The soundproof case C of the soundproof type engine working machine is divided into an engine room A, a radiator room B and an exhaust silencer room F, and an indoor ventilation fan 1 is provided in the engine room A as set forth in claim 1. Since the electric or hydraulic drive fan G is arranged in the room B,
Since the interior of the soundproof case C is completely divided, the vibration noise of the engine E is less likely to leak out of the soundproof case C. Further, by dividing each part into separate rooms, the arrangement intervals of the respective devices can be reduced and arranged, and a compact soundproof engine working machine can be obtained as a whole.

Since the exhaust silencer M is arranged in the upper part of the engine room A and the both side wall portions of the soundproof case C in the engine room A are double walls, each is surrounded by the engine E. Since the double wall part can be arranged in the room, it is possible to make the entire circumference into a double wall together with the double walls of other parts around the engine E, and it is possible to reduce the noise level. It was.

According to the third aspect of the invention, the radiator R is arranged inside the radiator chamber B, and the radiator R is arranged obliquely so that the upper side is inclined to the engine E side. Therefore, the radiator is arranged vertically toward the rear wall. As in the case of the above, the space for changing the direction of the discharge air upward is not required, and the length of the soundproof case C in the longitudinal direction can be shortened. Further, it is possible to reduce the cooling air loss of the air discharged from the electric or hydraulically driven fan G.

Since the cooling air in the radiator chamber B and the indoor ventilation fan 1 are merged on the upper surface of the soundproof case C and exhausted, the upper exhaust port 7 of the indoor ventilation fan 1 is Since it can be used also as the air exhaust port of the electric or hydraulically driven fan G, it is not necessary to separately provide an upper air exhaust port. Further, the temperatures of the cooling air of the indoor ventilation fan 1 and the electric or hydraulically driven fan G are
Since it is low even after cooling the radiator M and the radiator R, the exhaust muffler M can be efficiently cooled by applying the cooling air to the exhaust muffler M.

Since a part of the cooling air introduced into the radiator room B is introduced into the engine room A as described in claim 5, the radiator room B also serves as a muffling room. The leakage of noise can be silenced again in the radiator chamber B. Further, by introducing the cooling air of the radiator chamber B into the engine room A, the cooling air can be effectively used.

According to the sixth aspect of the present invention, the rotation of the indoor ventilation fan 1 sucks cooling air from the cooling air intakes 18 on both sides of the soundproof case C, and the sucked cooling air is supercharged in the engine room A. Since the engine N is configured to be cooled, the engine supercharger N itself can be housed inside the soundproof case C and cooled by the suction air of the indoor ventilation fan 1. Since it is not necessary to dispose only the supercharger N outside the soundproof case C and to separately provide a cooling mechanism, the noise of the engine supercharger N does not leak to the outside.

According to the seventh aspect, the indoor ventilation fan 1 is
It is provided on the boundary between the engine room A and the exhaust silencer room F above the soundproof case C, the indoor ventilation fan 1 is inclined, and the exhaust silencer M inside the exhaust silencer room F is connected to the engine room A. Since it is configured to discharge the air, even the large indoor ventilation fan 1 can be lowered in height by arranging it obliquely. Therefore, the soundproof case C
It was possible to reduce the overall height of the. Further, since the exhaust silencer M can be cooled by the air discharged from the indoor ventilation fan 1, the cooling efficiency of the exhaust silencer M can be improved.

According to the eighth aspect, an exhaust silencer chamber F is formed in the upper part of the soundproof case C, the exhaust silencer M is arranged inside the exhaust silencer chamber F, and the exhaust silencer M is supported. Since the table also serves as the exhaust air guide 2, both the cooling air from the indoor ventilation fan 1 and the cooling air from the electric or hydraulically driven fan G are turned upward in the portion of the exhaust air guide 2. Therefore, both cooling winds do not collide with each other and are smoothly discharged. Further, since the exhaust guide 2 also serves as a mounting table for the exhaust silencer M, it is not necessary to separately provide a mounting table for the exhaust silencer M.

[Brief description of drawings]

FIG. 1 is an overhead view of a soundproof engine working machine according to the present invention.

FIG. 2 is a side sectional view of the soundproof engine work machine of the present invention.

FIG. 3 is a plan sectional view of the soundproof engine working machine.

FIG. 4 is a plan sectional view showing a state in which a double side plate 9 is similarly arranged on the side surface.

FIG. 5 is a front view of a soundproof engine working machine.

FIG. 6 is a rear sectional view of a radiator R portion of the same.

FIG. 7 is a perspective view showing a state in which an upper cover 6 of the soundproof case C and an exhaust silencer M are removed.

FIG. 8 is an exploded view showing a mounting mechanism of the battery 20.

FIG. 9 is a side view showing a configuration in which an engine room A, a radiator room B, and an exhaust silencer room F are partitioned.

FIG. 10 is a side view showing a configuration in which the indoor ventilation fan 1 is obliquely arranged.

FIG. 11 is a view showing the arrangement of a fuel tank T.

FIG. 12 is a side view showing a configuration in which an exhaust air guide 13 is provided at a confluence portion of discharge air of the electric or hydraulically driven fan G and the indoor ventilation fan 1.

FIG. 13 is a side view showing a configuration in which the indoor ventilation fan 1 is arranged in the exhaust silencer M of the center frame 10.

FIG. 14 is a side view showing a configuration in which a cooling air guide plate 14 is provided in the exhaust silencer M of the engine room A and the radiator room B.

FIG. 15 is a plan view of FIG.

FIG. 16 is a side view showing a configuration in which an electric or hydraulic drive fan G and a radiator R are obliquely arranged.

FIG. 17 is a side view showing a configuration in which an auxiliary air outlet 15 is provided.

FIG. 18 is a side view showing a configuration in which the support base of the exhaust silencer M also serves as the exhaust guide 2.

[Explanation of symbols]

 A engine room B radiator room C soundproof case D generator E engine F exhaust silencer room G electric or hydraulic drive fan U bottom double wall 1 indoor ventilation fan 2 exhaust guide

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location F02B 77/13 SN (72) Inventor Nobuyuki Abe 1-32 Chayacho, Kita-ku, Osaka-shi, Osaka Yanmar Diesel Co., Ltd.

Claims (8)

[Claims] 1. A soundproof case C of a soundproof engine working machine is divided into an engine room A, a radiator room B, and an exhaust silencer room F, and an indoor ventilation fan 1 is provided in the engine room A to provide a radiator room. A soundproof engine working machine having an electric or hydraulically driven fan G disposed at B. 2. The soundproof engine working machine according to claim 1, wherein an exhaust silencer M is arranged above the engine room A, and both side wall portions of the soundproof case C in the engine room A are double walls. A soundproof engine working machine characterized by that. 3. The soundproof engine working machine according to claim 1, wherein a radiator R is arranged inside a radiator chamber B, and the radiator R is obliquely arranged so that its upper side is inclined toward the engine E side. Soundproof engine working machine. 4. The soundproof engine working machine according to claim 1, wherein the cooling air in the radiator chamber B and the indoor ventilation fan 1
A soundproof type engine working machine, characterized in that and are combined and discharged on the upper surface of the soundproof case C. 5. The soundproof engine working machine according to claim 1, wherein a part of the cooling air introduced into the radiator chamber B is
A soundproof engine working machine, which is installed in the engine room A. 6. The soundproof engine working machine according to claim 1, wherein the indoor ventilation fan 1 is rotated to suck cooling air from the cooling air intakes 18 on both sides of the soundproof case C, and the sucked cooling air is A soundproof engine working machine, which is configured to cool the engine supercharger N in the engine room A. 7. The soundproof engine working machine according to claim 1, wherein the indoor ventilation fan 1 is provided above the soundproof case C at the boundary between the engine room A and the exhaust silencer room F for indoor ventilation. A soundproof engine working machine characterized in that the fan 1 is inclined and the exhaust silencer M inside the exhaust silencer chamber F is configured to discharge the air in the engine room A. 8. The soundproof engine working machine according to claim 1, wherein an exhaust silencer chamber F is formed in an upper portion of the soundproof case C, and the exhaust silencer M is arranged inside the exhaust silencer chamber F. A soundproof engine working machine, wherein the support stand of the exhaust silencer M also serves as the exhaust guide 2.