JP2739184B2 - Cooling system for soundproof engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof engine having an engine housed in a soundproof case, and more particularly to a water-cooled engine having a radiator.

2. Description of the Related Art In a soundproof engine in which a water-cooled engine is covered with a soundproof case, a radiator is also housed in the soundproof case. In this case, conventionally, cooling air for a radiator or intake air of an engine is taken in from one opening formed in the soundproof case, and after cooling a work machine (for example, a generator) and an engine in the soundproof case, the radiator is cooled. The air is exhausted by a fan (for example,
62-29448).

Problems to be Solved by the Invention As described above, in the conventional case in which the water-cooled engine is housed in the soundproof case, the radiator is also housed in the soundproof case, but it is very difficult to cool the radiator. In addition, a large amount of air is required, and therefore, the opening area for the intake must be increased. Therefore, there is a disadvantage that the amount of noise leakage from the opening increases and the noise reduction effect is not sufficient. Was. Further, conventionally, since the radiator, the engine, and the like are arranged in one case without boundaries, the cooling air for cooling the radiator is supplied by the one heated by the heat radiation from the engine. As a result, the cooling efficiency of the radiator is reduced, so that the radiator must have a large capacity, and there is an inconvenience that the size of the entire radiator including the fan is increased and noise is increased. In addition, the intake air of the engine also draws in warmed air due to the heat radiation of the engine, so that the output of the engine is disadvantageously reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and to realize a soundproof type engine having a good heat balance in a soundproof case and capable of reducing engine noise.

Means for Solving the Problems In order to solve the above problems, the invention of claim 1 of the present application provides an engine room for housing an engine and a working machine in a soundproof case, a radiator chamber for housing a radiator and a fuel tank, and And a muffler chamber having a cooling air discharge port.In the radiator chamber, a fuel tank, a radiator fan, and a radiator are provided from an opening for taking in cooling air to the radiator chamber toward an outlet to the muffler chamber. The exhaust air cooling the working machine, the exhaust air cooling the engine, and the exhaust air from the radiator chamber are guided to the muffler chamber independently of each other by dedicated fans, respectively.

Similarly, the invention according to claim 2 of the present application provides an engine and a generator in a soundproof case, a cooling wind for the engine, a cooling wind for the generator, and a radiator separate from the engine room also in the soundproof case. Each inlet passage of the cooling air of the radiator housed in the room is formed independently of each other, and an intake chamber for taking in the intake air of the engine from the outside is arranged on the side of the generator, and an air cleaner arranged in the intake chamber and the radiator room And an air cleaner and an engine are further connected by a connecting pipe.

In the invention of FIG. 1 of the above-mentioned application, the radiator is housed in a radiator room partitioned from an engine room or the like, and cooling exhaust air from an engine room or a generator is partitioned from the radiator room. Since it is guided into the muffler chamber, even if the cooling air intake for the radiator is enlarged, noise of the engine and the generator does not leak from the large opening, and the noise can be reduced. In addition, since the cooling air of the radiator is directly supplied at a low temperature which is not heated by the heat radiation of the engine and the generator, the cooling efficiency is improved, and as a result, the radiator has a smaller capacity than the conventional one. Things.
Further, since the cooling exhaust air that has cooled the generator is guided into the muffler room independently of the engine room, the heat balance is improved.

In the second invention of this application, the cooling air of the engine room, the intake air of the engine, and the cooling air of the radiator are independently taken in, respectively. Since the intake of the engine can be made smaller, the amount of noise leakage to the outside can be further reduced. Further, since the intake air that is not heated by the heat radiation of the engine or the like is sucked, the output of the engine can be improved.

2 to 6 showing an embodiment of the present invention. First, an engine (1) and a generator (2) directly connected to the engine (1) are connected to a gantry (3). ) Set up on top and these are box-shaped soundproof cases (4)
Covered by The interior of the soundproof case (4) is vertically divided by a horizontal partition wall (5), and the engine (1) and the generator (2) are placed in an engine room (6) below the partition wall (5). Are located. Further, the upper side of the partition wall (5) is divided into a muffler chamber (7) and a radiator chamber (8) by a vertical partition wall (9) in the front-rear direction which is the same direction as the crankshaft. In the radiator chamber (8), a radiator (11) having a radiator fan (10) is arranged in contact with a partition wall (9) with the muffler chamber (7), and is opposed to the partition wall (9). A fuel tank (12) is arranged on the side. An electrical component unit (13) is provided below the fuel tank (12). The electrical component unit (13) is equipped with an electronic controller, a relay, and timers for controlling the engine (1), and meters for the generator (2), such as a voltmeter, an ammeter, and a voltage regulator. I have. These switches are arranged so as to be exposed outside the soundproof case (4). Further, an air cleaner (14) is arranged in the radiator chamber (8) beside the radiator (11), and the intake air of the air cleaner (14) is supplied to the generator (2) in the engine room (6). ) Is guided through an intake communication pipe (16) from an intake chamber (15) disposed on the side of the engine chamber (15), and furthermore, from an air cleaner (14) through an intake outlet pipe (17), the engine in an engine room (6). (1) side.

In the muffler room (7), a first muffler (19) horizontally arranged along the bottom surface of the muffler room (7) and a second muffler (20) also vertically arranged are arranged. , A first muffler (19) is connected via an exhaust pipe (21)
It is connected to the engine (1) in the engine room (6). The exhaust air of the first muffler (19) is guided to a second muffler (20), and further from the second muffler (20),
The discharge pipe (22) is directly discharged to the outside just above the soundproof case (4). Further, the muffler chamber (7) has a slit-shaped discharge port (23) on its upper wall.
Are formed in large numbers. On the side wall of the radiator chamber (8) opposite to the muffler chamber (7), an opening (24) for taking in cooling air is formed, and the outside of the opening (24) is covered by an introduction duct (25). At the same time, the cooling air taken in from the intake (26) below the introduction duct (25) is guided from the opening (24) into the radiator chamber (8). The cooling exhaust air that has cooled the radiator (11) and the like in the radiator chamber (8) is discharged into the muffler chamber (7) by the radiator fan (10), and further from the muffler chamber (7) to the slit. It is discharged to the outside through the discharge port (23).

In this case, as shown in FIG. 1, from the opening (24) toward the outlet to the muffler chamber (7), the fuel tank (12),
The radiator fan (10) and the radiator (11) are arranged in this order, and the cooling air taken in from the opening (24) first cools the fuel tank (12) and then is supplied to the radiator (10). It has become so.

The gantry (3) on which the engine (1) and the generator (2) are installed has a frame member (28) surrounding the periphery of the gantry is formed of a groove-shaped member having an opening facing outward. Openings (29) and (29) in the flange as shown in FIG.
Are formed so that cooling air can be taken into the soundproof case (4). These openings (2
The upper part of 9) (29) is surrounded by two introduction chambers (31) and (32) partitioned in the left-right direction in FIG. One inlet chamber (31) is connected to the inlet side of a first inlet duct (33) for cooling air for a generator, and the outlet side of the inlet duct (33) is connected to the engine (1) of the generator (2). And a second introduction duct (34) provided so as to surround an end opposite to the part directly connected to the second introduction duct (34). A dedicated cooling fan (35) for the generator (2) is arranged in a fan case (36) at a boundary between the generator (2) and the engine (1). As shown in FIG. 2, an outlet formed in the outer peripheral portion of the fan case (36) is provided with a dedicated exhaust duct (37) so as to be independent of the engine room (6) and the radiator room (8). It is led into the room (7). That is, one introduction chamber (31) from the opening (29).
The cooling air that has entered into the generator (2) is sucked into the generator (2) through the first and second introduction ducts (33) and (34) by the generator cooling fan (35). After cooling 2), it is discharged from the discharge duct (37) into the muffler chamber (7), and further discharged from the muffler chamber (7) to the outside through the slit-shaped discharge port (23).

Further, one end of an intake inlet pipe (40) is connected in the middle of the first introduction duct (33), and the other end of the inlet pipe (40) is connected to the intake chamber (15). At the same time, the intake communication pipe (16), the air cleaner (14) and the intake outlet pipe (1) are removed from the intake chamber (15).
Through 7), it is sucked into the intake port of the engine (1).

As shown in FIG. 5, a third inlet duct (41) for the engine room is connected to the other inlet chamber (32), and the lower outlet portion of the inlet duct (41) is soundproof. It is connected to a third introduction duct (42) formed along the bottom surface of the case (4). This introduction duct (42)
The exit (43) opens into the engine room (6),
Cooling air is taken into the engine room (6). Further, an oil pan (44) of the engine (1) protrudes from the upper wall surface of the second introduction duct (42) in the middle thereof, so that the cooling through the fourth introduction duct (42) is performed. After cooling the oil pan (44) by wind, the oil pan (44) enters the engine room (6) to cool and ventilate the engine room (6). As shown in FIG. 6, the engine room (6) is led into the muffler room (7) by a discharge duct (45) formed at the boundary with the radiator room (8). A dedicated ventilation fan (46) provided at the entrance of the system (45), forcibly exhausting the cooling air in the engine room (6) into the muffler room (7), and from the muffler room (7), The air is discharged to the outside through the discharge port (23). The dedicated ventilation fan (46) is driven by an electric motor powered by the generator (2). The radiator fan (10) in the radiator room (8) is driven by an electric motor powered by a battery (47) arranged in the engine room (6).

The following table shows the noise reduction values of the soundproof type engine prototyped based on the above embodiment. In general, the present invention further reduces the noise reduction by about 6 dB (A) compared to the conventional soundproof structure. Was obtained. In the table, the operation panel refers to a surface of the electrical component unit (13) on a side where the operation switches are exposed.

Effects of the Invention According to the first invention of this application, as described above, since noise of an engine, a generator, and the like does not leak directly from the opening of the radiator chamber, it is necessary to take in the cooling air. Even when the cooling efficiency is increased by increasing the opening, noise can be reduced. In addition, since the radiator is supplied with low-temperature cooling air that is not heated by the heat radiation of the engine and the generator, the cooling efficiency increases, and the radiator capacity can be reduced accordingly, making the whole compact. In addition, the size of the radiator fan is reduced, so that noise can be further reduced. Further, since the cooling exhaust air of the generator and the radiator is discharged to the muffler room side independently of the engine room, for example, the engine room is not heated by the exhaust air cooling the generator, and the engine room is not heated. The cooling air that cooled the inside,
Since the generator and the radiator are discharged to the muffler chamber side separately, the heat balance is also improved. In addition, since the fuel tank is arranged together with the radiator in the radiator chamber, and the fuel tank is arranged on the opening side which is the intake of the cooling air to the radiator chamber, the cooling air constantly taken into the radiator chamber is provided. This fuel tank can also be cooled.

Further, according to the second invention of this application, since the intake air of the engine, the cooling air of the engine and the cooling air of the radiator are individually taken in, it is only necessary to take in a necessary amount of cooling air corresponding to each. There is no need to form a large opening that lowers the temperature of the entire cooling air in accordance with the equipment that requires the lowest cooling air, and the area of the entire opening can be reduced, reducing noise leakage to the outside. In addition to this, low-temperature air not heated by other devices is directly supplied to the intake air of the engine, so that the output of the engine can be improved. In addition, the air intake chamber is located on the side of the generator and cooled by cooling air with the generator, and the air cleaner is located in the radiator chamber and cooled by the cooling air in the radiator chamber. The function of the intercooler can be produced, and there is an effect that the output of the engine can be improved by improving the intake efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic diagram conceptually showing the structure of the present invention, and FIG.
FIG. 3 is a longitudinal sectional view of a soundproof engine showing an embodiment of the present invention. FIG. 3 is a sectional view taken along line AA of FIG. 2, FIG. 4 is a sectional view taken along line BB of FIG. FIG. 6 is a sectional view taken along the line CC of FIG. 3, and FIG. 6 is a sectional view taken along the line DD of FIG. (1) ... engine, (2) ... generator, (4) ... soundproof case, (6) ... engine room, (7) ... muffler room, (8) ... radiator room, (10) Radiator fan, (11) Radiator, (12) Fuel tank, (14) Air cleaner, (15) Intake chamber, (16) Connection pipe, (17) Connection pipe ,(twenty three)……
Cooling air outlet, (24) ... opening, (35) ... cooling fan for generator, (46) ... ventilation fan for engine room

Claims (2)

(57) [Claims] The interior of the soundproof case is divided into an engine room that houses an engine and a working machine, a radiator room that houses a radiator and a fuel tank, and a muffler room that has a cooling air outlet, and in the radiator room, A fuel tank, a radiator fan, and a radiator are arranged in this order from an opening for taking cooling air into the radiator chamber to an outlet to the muffler chamber, and exhaust air that cools the working machine and exhaust air that cools an engine. A cooling fan for the soundproof engine, wherein exhaust air from the radiator chamber is guided to the muffler chamber independently of each other by dedicated fans. 2. An engine and a generator are housed in a soundproof case, and a cooling wind of the engine, a cooling wind of the generator, and a radiator housed in a radiator room separate from the engine room in the soundproof case. The cooling air inflow passages are formed independently of each other, and the intake chamber that takes in the intake air of the engine from the outside is arranged on the side of the generator, and this intake chamber and the air cleaner arranged in the radiator chamber are connected by a connecting pipe. A cooling device for the soundproof engine, wherein the air cleaner and the engine are connected by a connecting pipe.