JPH074864U - Soundproof engine - Google Patents

Abstract

(57) [Summary] [Structure] The soundproof engine was made as follows. The silencers 6 and 7 are connected to the outside air inlet 4 and the clean air outlet 5 of the air cleaner 3, and the outside air intake case 9 in the shape of a bowl is rotatably attached to the outside of the vertical wall 8 of the soundproof case 1, and its peripheral side wall. 15
The outside air intake 16 was opened. [Effect] The intake pulsation sound and the combustion explosion sound are attenuated by the silencers 6 and 7 and then emitted from the outside air intake 16 along the vertical wall 8 of the soundproof case 1. Therefore, the outside air intake 1
When 6 is directed to the floor surface 17 or wall surface of the installation location of the soundproof case 1 while avoiding the direction of human beings, the attenuated noise emitted from here collides with the floor surface 17 or wall surface of the installation location. As a result, a part of the sound absorbing case 1 is absorbed, and the remaining part is further attenuated by mutual interference of noises after the reflection, so that the surroundings of the soundproof case 1 are quieted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a soundproof engine, and more particularly to a soundproof engine that can secure the output performance of the engine and the like, and at the same time, can ensure quietness around the soundproof case.

[0002]

[Prior art]

 As a conventional soundproof engine, there is a soundproof case in which an engine and an air cleaner are housed. This type of soundproof engine has the advantage that the sound of combustion explosion and vibration generated from the engine can be isolated by the soundproof case.

By the way, in the conventional soundproof engine, the outside air intake port of the air cleaner usually faces the soundproof case.

[0004]

[Problems to be solved by the device]

 The above conventional technique has the following problems. Since the outside air intake of the air cleaner faces the soundproof case, the air in the soundproof case is sucked into the air cleaner. The temperature of the air inside the soundproof case is much higher than the outside temperature due to the heat released from the engine. For this reason, the intake air temperature becomes high, and in the case of a diesel engine, the efficiency of filling air in the combustion chamber is low, and high output may not be secured. Also, in the case of a gasoline engine, percolation in the carburetor and vapor lock in the fuel supply route are likely to occur.

In order to solve the above-mentioned problem, it is conceivable that an outside air introduction passage is led out from the outside air intake of the air cleaner and the passage inlet is opened by the vertical wall of the soundproof case. However, simply opening the aisle entrance in the vertical wall of the soundproof case may leave the aisle entrance facing toward the person depending on the installation condition of the soundproof case. In this case, the intake pulsation sound and the combustion explosion sound are emitted toward the human from the entrance of the passage, and the silence around the soundproof case cannot be secured.

An object of the present invention is to provide a soundproof engine that can secure the output performance of the engine and the like, and at the same time, can ensure quietness around the soundproof case.

[0007]

[Means for Solving the Problems]

 (First Invention) As shown in FIG. 1, the first invention is a soundproof engine in which the engine 2 and the air cleaner 3 are housed in the soundproof case 1, and is characterized as follows.

That is, a silencer 6, 7 is connected to at least one of the outside air inlet 4 and the clean air outlet 5 of the air cleaner 3, and a slump-shaped outside air intake case 9 is rotated outside the vertical wall 8 of the soundproof case 1. The outside air intake case 9 and the air cleaner 3 are connected to each other through an outside air introduction passage 10, and the passage inlet 11 of the outside air introduction passage 10 is opposed to the end wall 12 of the outside air intake case 9 so that the outside air intake passage 9 can be adjusted. An outside air intake 16 is formed in the peripheral side wall 15 of the case 9.

(Second Invention) As shown in FIG. 1, the second invention is the soundproof engine of the first invention, in which the vertical wall 8 of the soundproof case 1 to which the outside air intake case 9 is attached is the engine outlet. It is characterized in that it is an output extraction side vertical wall 14 having a force extraction hole 13 formed therein.

(Third Invention) As shown in FIG. 1, the third invention is that, in the soundproof engine of the first invention or the second invention, the silencers 6 and 7 are formed integrally with the air cleaner 3. Is characterized by.

[0011]

[Operation and Effect of the Invention] (First Invention) The first invention has the following operation and effect. Outside air is drawn into the air cleaner 3 from outside the soundproof case 1 through the outside air intake case 9 and the outside air introduction passage 10 in this order. Therefore, the intake air temperature is lower than in the case where the air in the soundproof case 1 is taken in, and in the case of a diesel engine, the efficiency of filling the air in the combustion chamber is high and a high output is secured. Also, in the case of a gasoline engine, percolation in the carburetor and vapor lock in the fuel supply route are less likely to occur.

The intake pulsation sound and the combustion explosion sound are attenuated by the silencers 6 and 7, and also by mutual noises in the outside air introduction passage 10, and are attenuated from the passage inlet 11 of the outside air introduction passage 10. It is discharged into the outside air intake case 9. The attenuated noise emitted into the outside air intake case 9 collides with the end wall 12 thereof, then changes its direction, and is emitted from the outside air intake 16 along the vertical wall 8 of the soundproof case 1. For this reason, if the outside air intake 16 is directed toward the floor surface 17 or wall surface of the location where the soundproof case 1 is installed while avoiding the direction of humans, the attenuated noise emitted from this location causes the floor noise of the installation location. While colliding with the surface 17 and the wall surface, a part of the collision is absorbed, and the remaining part is further attenuated by mutual interference of the reflected noises, so that the surroundings of the soundproof case 1 are quieted.

(Second Invention) In addition to the effects of the first invention, the second invention has the following effects in which the above effects are further enhanced. The outside air intake 16 of the outside air intake case 9 is provided in a gap 20 formed between the vertical wall 19 of the working machine 18 such as a pump or a compressor which is interlocked by the engine 2 and the output take-out side vertical wall 14 of the soundproof case 1. Therefore, the attenuated noise emitted from the noise is further attenuated by the mutual interference of noises when passing through the gap 20. In this way, the vertical wall 14 on the output take-out side of the soundproof case 1 and the vertical wall 19 of the work machine 18 can be used as a muffler, so that the surroundings of the soundproof case 1 can be further quietened.

(Third Invention) In addition to the operational effects of the first invention or the operational effects of the second invention, the third invention has the following operational effects. Since the mufflers 6 and 7 are formed integrally with the air cleaner 3, a connecting hose for connecting them is not required, and the mufflers 6 and 7 and the air cleaner 3 are compactly integrated, so that they can be installed in a narrow soundproof case 1. Ventilation efficiency is improved.

[0015]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional side view of a soundproof engine according to an embodiment of the present invention. FIG. 2 is a vertical sectional side view of an air cleaner with a silencer used in the soundproof engine of FIG. FIG. 3 is a perspective view of an outside air intake case used in the soundproof engine of FIG.

The structure of the soundproof engine shown in FIG. 1 is as follows. The engine 2, the air cleaner 3, the radiator 21, the exhaust muffler (not shown), and the ventilation fan 22 are housed in the soundproof case 1. The soundproof case 1 has a rectangular box shape, and a urethane foam sound absorbing material 23 is adhered to the inner surface thereof. A diesel engine is used as the engine 2, and the engine 2 is vibration-proof supported on the bottom wall of the soundproof case 1 via a vibration-proof rubber 28.

A cooling fan 31 is provided in the front part of the engine 2, and a radiator 21 is arranged on the front side of the cooling fan 31. A cooling air inlet 24 is formed in a front vertical wall of the soundproof case 1 at a position facing the radiator 21, and a dustproof net 25 is stretched there. A cooling air introduction case 26 is detachably attached to the front side of the cooling air inlet 24. The cooling air introduction case 26 is formed in a U shape in plan view, and cooling air intake ports (not shown) are formed on both sides of the cooling air introduction case 26. A sound absorbing material 27 is also attached to the inner surface of the cooling air introduction case 26.

The exhaust muffler is arranged on the back side of the drawing with respect to the engine 2, and a ventilation fan 22 is arranged above the exhaust muffler. The ventilation fan 22 is housed in a fan case 29 having openings on both sides. A ventilation port 30 is opened above the fan case 29.

In this soundproof engine, when the engine 2 is operated, the cooling fan 31 is interlocked, and the intake air force sucks the outside air as the cooling air from the cooling air intake port of the cooling air introduction case 26. The cooling air bypasses the cooling air introduction case 26 and is sucked into the soundproof case 1 through the cooling air inlet 24 to cool the engine. The cooling exhaust air in the soundproof case 1 is sucked into the fan case 29 by the sucked wind force of the ventilation fan 22 and discharged from the ventilation port 30, whereby the soundproof case 1 is ventilated.

A flywheel 32 that doubles as an engine output take-out portion is provided at the rear of the engine 2. The flywheel 32 is accommodated in a flywheel case 33. The vertical wall 8 on the rear side of the soundproof case 1 is provided with an engine output take-out hole 13 at a position facing the flywheel 32. When the working machine 18 such as a pump is interlocked with the engine 2, the working machine 18 is installed on the rear side of the vertical wall 8 behind the soundproof case 1 which is the engine output side vertical wall 14, and the input of the working machine 18 is input. This is done by inserting the shaft 34 into the engine output take-out hole 13 and connecting it to the flywheel 32.

The structure of the air cleaner 3 is as follows. That is, as shown in FIG. 2, the cleaning air outlet 5 is provided on the ceiling wall 35 of the vertically long cylindrical cleaner case 36, and the stay 38 is vertically provided from the cleaning air outlet 5. A cylindrical filter element 37 is fitted on the stay 38. An element supporting plate 40 is detachably attached to the stay 38 via a wing bolt 39, and the filter element 37 is detachably attached to the cleaner case 36 by the element supporting plate 40. The outside air inlet 4 is provided on the peripheral wall 42 of the cleaner case 36. The lower end opening of the cleaner case 36 is closed by a bowl-shaped lid 41.

In this embodiment, in order to secure the output performance of the engine and the like, and at the same time, to secure the quietness around the soundproof case, the following configuration is adopted. That is, the silencer 6 is connected to the outside air inlet 4 of the air cleaner 3, and the silencer 7 is connected to the purified air outlet 5. The structure of the muffler 6 connected to the outside air inlet 4 is as follows. An outer air introducing pipe 46, which is concentric with the peripheral wall 43, is inserted into a ceiling wall 44 of a cylindrical sound-absorbing case 45. Then, the communication pipe 47 is led out from the middle of the outside air introduction pipe 46 into the silencing case 45, whereby a silencing function by resonance is obtained. The muffling case 45 is fixed to the peripheral wall 42 of the cleaner case 36, and this peripheral wall 42 is also used as the bottom wall of the muffling case 45. The outside air outlet pipe 46 is connected to the outside air inlet 4.

The muffler 7 connected to the air purification outlet 5 has the same structure, and the muffler case 48 is fixed to the ceiling wall 35 of the cleaner case 36, and this ceiling wall 35 also serves as the bottom wall of the muffler case 48. The purified air outlet pipe 51 is connected to the purified air outlet 5.

Further, as shown in FIG. 1, a bell-shaped outside air intake case 9 is attached to the outside of the output extraction side vertical wall 14 of the soundproof case 1. As shown in FIG. 3, a horizontal bolt 49 is fixed to the output taking-out side vertical wall 14 of the soundproof case 1, and a wing nut 50 is screwed to the bolt 49. The bolt 49 is inserted through the end wall 12 of the outside air intake case 9, and the outside air intake case 9 is fixed to the vertical wall 14 on the output take-out side of the soundproof case 1 by the wing nut 50. The outside air intake case 9 can be rotated about the bolt 49 by loosening the butterfly nut 50.

Further, as shown in FIG. 1, the inside of the outside air intake case 9 and the air cleaner 3 are communicated with each other by an outside air introduction passage 10, and the passage inlet 11 of the outside air introduction passage 10 has a vertical wall on the output take-out side of the soundproof case 1. The passage inlet 11 faces the end wall 12 of the outside air intake case 9.

FIG. 4 is a vertical cross-sectional side view of a modified example of the air cleaner with a silencer shown in FIG. In FIG. 2, the muffler 6 is connected to the outside air inlet 4 of the air cleaner 3 and the muffler 7 is connected to the clean air outlet 5, but in FIG. 4, the clean air outlet 5 of the air cleaner 3 is connected. The silencer 7 is connected only to the outside air inlet 4, and the silencer is not connected to the outside air inlet 4. The bottom wall 52 of the silencer 7 is provided separately from the ceiling wall 35 of the air cleaner 3. The other structure is similar to that of FIG.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a soundproof engine according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view of an air cleaner with a silencer used in the soundproof engine of FIG.

3 is a perspective view of an outside air intake case used in the soundproof engine of FIG. 1. FIG.

FIG. 4 is a vertical cross-sectional side view of a modified example of the silencer-equipped air cleaner of FIG. 2.

[Explanation of symbols]

1 ... Soundproof case, 2 ... Engine, 3 ... Air cleaner, 4
… 3 outside air inlet, 5… 3 clean air outlet, 6.7… silencer,
8 ... Vertical wall, 9 ... Outside air intake case, 10 ... Outside air introduction passageway, 11 ... 10 passage inlet, 12 ... 9 end wall, 13
... Engine output take-out hole, 14 ... Output take-out side vertical wall, 15 ... 9 side wall, 16 ... Outside air intake port.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masao Okazaki, creator 64, Ishizukitamachi, Sakai City, Osaka Prefecture, Kubota Sakai Co., Ltd. (72) Manabu Miyazaki, 64, Ishizukitamachi, Sakai City, Osaka, Japan

Claims (3)

[Scope of utility model registration request] 1. A soundproof engine in which an engine (2) and an air cleaner (3) are housed in a soundproof case (1), wherein at least one of an outside air inlet (4) and a clean air outlet (5) of the air cleaner (3). Connect the silencer (6) and (7) to the soundproof case
Outside of the vertical wall (8) of (1)
(9) is rotatably mounted, the inside of the outside air intake case (9) and the air cleaner (3) are communicated with each other through the outside air introduction passage (10), and the passage inlet (11) of this outside air introduction passage (10) is connected. The outside air intake case (9) is opposed to the end wall (12), and the outside air intake port is formed on the peripheral side wall (15) of the outside air intake case (9).
A soundproof engine characterized by having (16). 2. The soundproof engine according to claim 1, wherein the vertical wall (8) of the soundproof case (1) having the outside air intake case (9) attached thereto has an engine output take-out hole (13).
A soundproof engine, characterized in that it is a vertical wall (14) on the output take-out side with an opening. 3. The soundproof engine according to claim 1 or 2, wherein the silencers (6) and (7) are air cleaners.
A soundproof engine characterized by being formed integrally with (3).