JP2000282885A - Sound isolation type engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heat of an exhaust muffler from excessively heating a fuel tank, without providing heat insulation means of a complex structure, between the exhaust muffler and the fuel tank. SOLUTION: This engine generator is provided with an exhaust muffler 2, radiator fan 4, engine 5, generator 6 and fuel tank 7 in a sound isolation case 1. The exhaust muffler 2 is arranged in the space 8 on the exhaust side on the front side of the radiator fan 4, and the fuel tank 7 is arranged on the lower side of the exhaust muffler 2. A fuel tank cooling air passage 23 is provided from the front side of the fuel tank 7 to the upper side. A fresh air intake port 21 at the start end section of the fuel tank cooling air passage 23 opens to the sound isolation case 1 at the front section of the bottom wall 17 of the fuel tank 2, to cause the terminal end of the fuel tank cooling air passage 23 to communicate with the space 22 on the air suction side on the rear side of the radiator fan 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof type engine generator provided with an engine generator in a soundproof case.

[0002]

2. Description of the Related Art In the above soundproof engine generator,
In some cases, the fuel tank is disposed at a lower position of the soundproof case and the fuel tank is set at a low position, thereby facilitating refueling of the fuel tank. That is, in the above soundproof engine generator,
The fuel tank is located in the space below the exhaust muffler.

[0003]

In such a soundproof engine generator, a heat insulating means is provided between the exhaust muffler and the fuel tank in order to insulate the fuel tank from the exhaust muffler. However, the heat insulating means becomes expensive due to its relatively complicated structure. In addition, the height of the fuel tank must be reduced by the space for disposing the heat insulating means. As a result, the capacity of the fuel tank is reduced.

An object of the present invention is to prevent the fuel tank from being overheated by the heat of the exhaust muffler without providing a complicated heat insulating means between the exhaust muffler and the fuel tank. Another object of the present invention is to make it more difficult for the fuel tank to be overheated and to improve the soundproofing performance. Still another object of the present invention is to make it difficult for the noise of the exhaust muffler to leak out of the soundproof case, and to increase the efficiency of discharging the cooling air.

[0005]

Means for Solving the Problems [Invention of claim 1] The invention of claim 1 is, for example, shown in FIG.
As shown in FIG. 3, the configuration is as follows. Exhaust muffler (2), engine cooling fan (4), engine (5), generator (6) and fuel tank in soundproof case (1)
(7), an exhaust muffler (2) is arranged in the exhaust side space (8) in front of the engine cooling fan (4), and a fuel tank (7) is arranged below the exhaust muffler (2). In the soundproof type engine generator, the fuel tank
A fuel tank cooling air passage (23) is provided from the front side to the upper side of (7), and the outside air inlet (2) at the start end of the fuel tank cooling air passage (23) is provided.
1) is opened to the soundproof case (1) at the front side of the fuel tank (2), and the terminal end of the fuel tank cooling air passage (23) is connected to the suction side space (22) behind the engine cooling fan (4). ).

[Invention of claim 2] The invention of claim 2 is the same as the above-mentioned invention of claim 1, but further configured as follows. By providing a sound-insulating plate (12) above the exhaust muffler (2) in the exhaust-side space (8) in the soundproof case (1), the above-described exhaust-side space (8) is provided by the sound insulating plate (12). The engine is configured so as to be vertically partitioned, a sound absorbing material (14) is provided on at least one of an upper surface and a lower surface of the sound insulating plate (12), and a vent (13) is provided on a front portion of the sound insulating plate (12). cooling fan
The cooling air sent to the lower space (8a) of the exhaust side space (8) by (4) passes through the ventilation port (13) and the upper space (8b) of the exhaust side space (8) in order. It is configured to pass through the soundproof case (1) and be discharged outside. In this configuration, the entire exhaust muffler (2) is provided in the lower space (8) of the exhaust side space (8).
The air exhaust muffler (2) may be located in the lower space (8a) of the exhaust air side space (8).

[Invention of claim 3] The invention of claim 3 is the same as the above-mentioned invention of claim 1, but further configured as follows, for example, as shown in FIG. Soundproof case
By providing a sound insulating plate (12) above the exhaust muffler (2) in the exhaust side space (8) in (1), the sound insulating plate (12) partitions the exhaust side space (8) up and down. By providing a sound absorbing material (14) on at least one of the upper surface and the lower surface of the sound insulating plate (12) and providing a vent (16) in the front wall (1a) of the soundproof case (1), The cooling fan (4) is used for the exhaust side space
(8) The cooling air sent to the lower space (8a) is
From the soundproof case (1). In this configuration, similarly to the second aspect of the present invention, the entire exhaust muffler (2) or a part (2a) of the exhaust muffler (2) includes the lower space (8a) of the exhaust-side space (8). ) Are included.

[0008]

[Operation and Effect of the Invention] [Claim 1] The invention of the above-mentioned claim 1 has the following operation and effect. That is, the outside air is introduced as cooling air from the outside air inlet (21) to the fuel tank cooling air passage (23) in the soundproof case (1) by the rotation of the engine cooling fan (4) by the operation of the engine. Then, the cooling air flows through the fuel tank cooling air passage (23) toward the air intake side space (22), so that the cold outside air [cooling air] immediately after being introduced from the outside of the soundproof case (1), The fuel flows from the front side to the upper side of the fuel tank 7 to cool the fuel tank 7 strongly.

That is, the fuel tank is cooled by the cooling air.
Since (7) can be cooled sufficiently, its fuel tank (7)
It is hard to be overheated by the heat of the exhaust muffler (2). Therefore, there is no need to provide a heat insulating means having a complicated structure between the exhaust muffler (2) and the fuel tank (7). Can be reduced. Moreover, the width between the exhaust muffler (2) and the fuel tank (7) may be as large as the fuel tank cooling air passage (23) can be provided, so that the height of the fuel tank (7) is increased accordingly. As a result, the capacity of the fuel tank (7) can be increased.

[Claim 2] The invention of claim 2 provides the following functions and effects in addition to the functions and effects of the invention of claim 1.
It works. The noise of the exhaust muffler (2) is reflected and absorbed by the sound insulating plate (12), and the noise is reflected in the soundproof case (1).
As a result, it is difficult to leak out, and as a result, the soundproof performance can be further improved.

In addition, from the engine cooling fan (4), the exhaust-side space (8) in front of the engine cooling fan (4).
The cooling air sent to the lower space (8a) flows to the front side along the sound insulating plate (12), and then flows into the ventilation port (13) at the front of the sound insulating plate (12), and The air is discharged to the outside of the soundproof case (1) through the upper space (8a) of the space (8) in order. In other words, the cooling air from the engine cooling fan (4) flows along the sound insulating plate (12) and is easily guided to the exhaust muffler (2) below the sound insulating plate (12). The exhaust muffler (2) can be sufficiently cooled. As a result, the temperature of the exhaust muffler (2) can be lowered, thereby making it more difficult for the fuel tank (7) to be overheated.

[Claim 3] The invention of claim 3 has the following functions and effects in addition to the functions and effects of the inventions of claims 1 and 2. As described above, the sound insulation performance can be further improved by the sound insulation plate (12). Moreover, the cooling air sent from the engine cooling fan (4) to the lower space (8a) of the exhaust side space (8) flows forward along the sound insulating plate (12), and the sound insulating plate (12) After sufficiently cooling the exhaust muffler (2) on the lower side of the soundproof case (1), the exhaust muffler (2) is discharged out of the soundproof case (1) from the vent (16) of the front wall (1a) of the soundproof case (1).

Then, the lower space (8)
Since the cooling air sent to a) may have an air volume enough to cool the exhaust muffler (2), the ventilation port (16) does not need to be too large. In other words, as long as the vent (16) does not need to be enlarged, the soundproof case
(1) The noise of the exhaust muffler (2) hardly leaks out, and the cooling air flows from the vent (16) as described above.
(1) The discharge efficiency of the cooling air is increased by the amount directly discharged to the outside.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a soundproof engine generator according to the present invention will be described below with reference to FIGS. 1 is a schematic longitudinal sectional view schematically showing the soundproof engine generator, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a longitudinal sectional view showing a sound insulating plate according to the soundproof engine generator. FIG.

The soundproof case of the above soundproof engine generator.
(1) The exhaust muffler is arranged in order from the front side (left side in FIG. 1).
(2), a radiator (3), a radiator fan [engine cooling fan] (4), an engine (5), a generator (6), and a fuel tank (7) below the exhaust muffler (2). ) Is arranged. And a generator by the engine (5).
(6) is driven. The above fuel tank
(7) is to be refueled from the refueling port (7a) [FIG. 2]. Further, the control panel (11) is provided with key switches for starting / stopping the engine (5), etc., outlets for taking out the power generation output, instruments and the like. The exhaust muffler (2) is disposed in an exhaust-side space (8) in front of the radiator fan (3), and is a first muffler mainly for silencing low-frequency sounds.
Muffler (2a) and a second muffler that mainly silences high-frequency sounds
(2b).

The exhaust side space (8) is formed by partitioning the inside of the soundproof case (1) with a bottom partition (9) and a radiator-side partition (10). The radiator-side partition plate (10) is provided with an opening (10a) as shown in FIG. 2, and the radiator (3) faces the opening (10a). Also, a sound insulating plate is provided above the first muffler (2a).
A sound insulation plate (12) divides the air discharge side space (8) into two upper and lower spaces (8a) (8b). The first space is placed in the lower space (8a) of the exhaust-side space (8).
The muffler (2a) is placed in the space above the exhaust side space (8).
The second muffler (2b) is arranged in (8b).

The sound insulating plate (12) is bent at an intermediate portion in the front-rear direction, and its front portion is formed to be inclined upward. A vent (13) is provided at the front end of the sound insulating plate (12), and a sound absorbing material (14) made of glass fiber, a porous material, or the like is attached to the upper surface of the sound insulating plate (12). . And
By providing the sound insulating plate (12) in the exhaust-side space (8), noise generated from the first muffler (2a) and the like is reflected and absorbed by the sound insulating plate (12), and thereby the exhaust air is exhausted. The noise of the muffler (2) is prevented from leaking out of the soundproof case (1). In addition, a drain hole (15) is provided in the bent portion of the sound insulating plate (12).

The soundproof case (1) cools the inside of the soundproof case (1) by taking in outside air by the following configuration. That is, outside air inlets (18) and (19) for cooling the engine generator are provided at the rear part of the bottom wall (17) of the soundproof case (1) and at the rear part of the side wall of the soundproof case (1), respectively. . Further, at the front of the bottom wall (17) of the soundproof case (1), an outside air inlet (21) for cooling the fuel tank is opened. The outside air intake (21)
Is the front of the fuel tank (7) and the front wall (1a) of the soundproof case (1)
, The top of the fuel tank (7) and the bottom partition
The radiator fan (3) communicates with the rear suction space (22) through a space between the radiator fan (3) and the space (9). As a result, a fuel tank cooling air passage (23) is formed in the soundproof case (1) from the front side to the upper side of the fuel tank (7). Also,
An outside air outlet (25) is provided at the front of the upper wall of the soundproof case (1). The outside air outlet (25) allows the upper space (8b) of the exhaust side space (8) to be a soundproof case. (1) There is communication outside.

The rotation of the radiator fan (3) accompanying the operation of the engine (5) causes the outside air to flow from the outside air inlets (18) and (19) and the outside air inlet (21) into the soundproof case (1). Is introduced as cooling air. The cooling air introduced from the outside air inlets (18) and (19) flows along the engine (5) and the generator (6) and cools the engine (5) and the generator (6). , And flows to the above-mentioned suction side space (22). On the other hand, the cooling air introduced from the outside air intake (21) flows along the above-described fuel tank cooling air passage (23) to cool the fuel tank (7), and then cools the fuel tank (7). ).

The cooling air flowing to the suction side space (22) passes through the radiator (3) to cool the radiator (3), and then the space (8a) above and below the exhaust side space (8). ) (8b). The cooling air sent to the lower space (8a) of the exhaust side space (8) flows along the peripheral surface of the first muffler (2a) and cools the first muffler (2a). Thereafter, the air flows into the upper space (8b) of the exhaust-side space (8) through the ventilation port (13) of the sound insulating plate (12), and from the radiator (3), the upper space (8) of the exhaust-side space (8). After cooling the second muffler (2b) by joining with the cooling air sent directly to 8b), the air is discharged from the outside air outlet (25) to the outside of the soundproof case (1).

Next, a second embodiment of the soundproof engine generator according to the present invention will be described with reference to FIG.
FIG. 4 is a diagram corresponding to FIG. 3 showing a sound insulating plate according to the second embodiment. The second embodiment has substantially the same configuration as the first embodiment described above, except that a soundproof plate (12) is provided with a vent (13) instead of a soundproof plate (12). A vent (16) is provided on the front wall (1a) of the case (1), and the vent (16) communicates the lower space (8a) of the lower space (8) to the outside of the soundproof case (1). That's the point. In other words, the lower space of the exhaust side space (8) by the radiator fan (3).
The cooling air sent to (8a) does not flow to the upper space (8b) of the exhaust-side space (8), but the soundproof case from the vent (16).
(1) Directly discharged outside.

In the above description, the outside air intake (21) is opened in the bottom wall (17) of the soundproof case (1). However, the present invention is not limited to this. An outside air inlet (21) may be opened in 1a). In the above description, the exhaust muffler (2) includes the first muffler (2a) and the second muffler (2b).
However, the present invention is not limited to this. For example, one exhaust muffler (2) may be used to separate the first muffler (2
It may have the function of a) and the second muffler (2b). In this case, the exhaust muffler (2)
(8) It is arranged in the lower space (8a).

Further, in the above description, the sound absorbing material (14) is attached to the upper surface of the sound insulating plate (12). However, the present invention is not limited to this, and the sound absorbing material (14) is mounted on the lower surface of the sound insulating plate (12). Or a sound absorbing material (14) may be attached to both the upper and lower surfaces of the sound insulating plate (12).

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view schematically showing a first embodiment of a soundproof engine generator according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical sectional view showing a sound insulating plate according to the soundproof engine generator.

FIG. 4 is a view showing a second embodiment of the soundproof type engine generator according to the present invention, and is a view corresponding to FIG. 3 showing a sound insulating plate according to the second embodiment of the present invention.

[Explanation of symbols]

1 ... soundproof case, 1a ... front wall of soundproof case, 2 ... exhaust muffler, 4 ... radiator fan [engine cooling fan], 5 ...
Engine, 6 ... Generator, 7: Fuel tank, 8: Exhaust space, 8a: Lower space of exhaust space, 12: Sound insulation board, 13.16 ...
Vent hole, 14: sound absorbing material, 21: outside air intake, 22: air intake side space, 23: fuel tank cooling air passage

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F01P 11/10 F01P 11/10 L

Claims (3)

[Claims] An exhaust muffler (2), an engine cooling fan (4), an engine (5), a generator (6), and a fuel tank (7) are provided in a soundproof case (1), respectively. In the soundproof type engine generator in which the exhaust muffler (2) is arranged in the exhaust side space (8) in front of the fan (4) and the fuel tank (7) is arranged below the exhaust muffler (2). In the soundproof case (1), a fuel tank cooling air passage (23) is provided from the front side to the upper side of the fuel tank (7), and an outside air inlet at a start end of the fuel tank cooling air passage (23). (21) is opened to the soundproof case (1) at the front side of the fuel tank (2), and the end of the fuel tank cooling air passage (23) is sucked at the rear side of the engine cooling fan (4). A soundproof engine generator, which communicates with a wind side space (22). 2. The soundproof engine generator according to claim 1, wherein a sound insulating plate (12) is provided in the exhaust side space (8) in the soundproof case (1) and above the exhaust muffler (2). By providing
The sound insulating plate (12) is configured to partition the exhaust side space (8) up and down, and a sound absorbing material (14) is provided on at least one of an upper surface and a lower surface of the sound insulating plate (12). By providing a ventilation port (13) at the front of (12), the cooling air sent to the lower space (8a) of the exhaust-side space (8) by the engine cooling fan (4) is Characterized in that it is configured to be discharged through the mouth (13) and the upper space (8b) of the exhaust-side space (8) to the outside of the soundproof case (1) in sequence. . 3. The soundproof type engine generator according to claim 1, wherein a sound insulation plate (12) is provided in the exhaust side space (8) in the soundproof case (1) and above the exhaust muffler (2). By providing
The sound insulation plate (12) is configured to partition the exhaust side space (8) up and down, and a sound absorbing material (14) is provided on at least one of an upper surface and a lower surface of the sound insulation plate (12); By providing a vent (16) in the front wall (1a) of (1), the cooling air sent to the lower space (8a) of the exhaust-side space (8) by the engine cooling fan (4) is reduced. The soundproof type engine generator is configured to be discharged from the ventilation hole (16) to the outside of the soundproof case (1).