JP2000097040A - Engine-driven power generating set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To calm an engine-driven power generating set in structural terms and compatibly establish the enhancement of the cooling efficiency with suppression of noise while a stress laid on the layout of a radiator and/or fan. SOLUTION: An engine-driven power generating set is configured so that a generator 12, engine 11, radiator 15, and fan 16 are installed inside a body case 10 equipped with an inlet port 10a and an exhaust port 10b, wherein the fan 16 is located downstream of the radiator 15, and they are positioned in such a sequence along the passage for cooling wind as from upstream, the inlet port 10a, generator 12, radiator 15, engine 11, and exhaust port 10b. Also a counterflow preventing means is furnished for the cooling wind having passed the radiator 15, for example a bulkhead. This allows the enhancement of the cooling efficiency of the engine and generator and a decrease in the noise simultaneously, and noise reduction can be accomplished at a low cost through small size construction of a sound absorbing duct and cooling fan.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine-driven power generator, and more particularly to an engine-driven power generator suitable for reducing noise of a power generator driven by a water-cooled engine that can be installed outdoors.

[0002]

2. Description of the Related Art A conventional engine-driven power generator is provided with a cooling fan 16 in a main body case 10 for protecting equipment from rain or the like when installed outdoors, as in the conventional structure shown in a sectional view in FIG. The sucked cooling air 40 passes through the air inlet 10a from the duct air inlet 20a and passes through the main body internal space 100.
It is being introduced into. The cooling air 40 cools the generator 12 and the control device 13 provided with electronic components weak to high temperatures, then cools the water-cooled engine 11, and is finally installed in the exhaust port 10 b provided in the main body case 10. The radiator 15 for cooling the engine 11 was cooled and exhausted in this order.

Particularly, in the radiator 15, since the fins for heat exchange constituting the radiator 15 have a large air resistance, the radiator is installed in the exhaust port 10b of the main body case 10, and the cooling fan 16 sets the engine side of the radiator 15 to a high pressure.
Cooling air passes through the radiator 15.
The cooling air 45 heated to a high temperature by the radiator 15 is prevented from flowing back to the engine / generator side by the exhaust duct 30.
By separating the high-temperature cooling air from the main body internal space 100,
Released outside.

In the engine-driven power generator having such a structure, noises and vibrations when the engine 11 is driven, sounds of the cooling fan 16 and the like leak from the opening of the main body case, particularly, the intake port 10a and the exhaust port 10b. Or noise transmitted through the main body case 10 is a problem.

For this reason, conventionally, the intake duct 2
The sound transmission structure is reduced by using a sound absorbing structure at the exhaust duct 30, the exhaust duct 30, or the intake / exhaust port (see JP-A-8-240125). Furthermore, the size of the device is reduced and noise is reduced by improving the sound absorbing duct structure provided at the intake port (Japanese Patent Laid-Open No. 8-453).
No. 1, JP-A-9-203326, etc.). Furthermore, in order to ensure the cooling performance of the engine, in the case of an air-cooled engine, the engine room and the generator room are completely separated from each other by a partition wall to achieve the optimum cooling of each (see Japanese Patent Application Laid-Open No. Hei 5-312050). There is.

[0006]

An engine-driven power generator is often used in a factory, a store, or the like to supplement power even during a power outage or during a non-power outage. In factories and stores in densely populated houses, noise from the engine-driven power generator may be a problem in residential areas.Therefore, install it indoors or install soundproof walls around it when installing it outdoors. Measures that required a lot of expense were needed. For this reason, it has been required to reduce the noise of the engine-driven power generation device itself.

In the above-mentioned prior art, a radiator is installed near the opening of the main body case in order to prevent the high-temperature cooling air from flowing back inside the main body, and the high-temperature cooling air passing through the radiator is directly discharged to the outside air. In order to install a radiator, an exhaust port having substantially the same size as the radiator has been installed in the main body case.

[0008] The size of the radiator is determined by the calorific value of the engine. On the other hand, when the equipment inside the main body case has become smaller due to the computerization of the control device, the miniaturization of the high-power generator and the engine, etc., the main body case becomes smaller, and the area of the radiator, that is, the area of the exhaust port, The proportion of the cross-sectional area of the main body case increases. In the conventional structure,
In order to prevent the cooling air from circulating in the main body case and to surely cool the radiator, it was necessary to install a radiator near the opening of the main body case.

Further, when the cooling air is heated by the radiator, electronic devices such as a generator and a control device which are weak to high temperature cannot be cooled. Therefore, it is necessary to cool these electronic devices before cooling the radiator. For this reason, the radiator must be provided at the exhaust port of the main body case, and an exhaust port having substantially the same size as the radiator is installed in the main body case to discharge the cooling air. For this reason, the cross-sectional area of the exhaust duct becomes large, and in order to achieve a specified noise level, there is a problem that the exhaust duct is particularly large and the cost of the entire apparatus is high.

Also, for maintenance of the apparatus,
When the operation is performed with the door of the main body case opened, air does not flow from the original intake port due to the flow of air from the door. For this reason, the flow of the cooling air from the generator or the control device requiring a low temperature toward the engine is not guaranteed, and the air heated by the engine flows toward the control device or the power generation device,
The device could malfunction. In addition, the cooling efficiency of the radiator has been reduced because the radiator is cooled by cooling air whose temperature has increased in the engine.

For this reason, it is difficult to reduce the cross-sectional area of the exhaust port in order to reduce the leakage noise of the cooling fan and the engine noise from the exhaust port near the exhaust port. Therefore, there is more noise leaking from the exhaust port than the intake port, and it is necessary to install a larger sound absorbing duct and more sound absorbing materials.In order to achieve the specified noise level, especially the exhaust duct However, there is a problem in that the size of the apparatus becomes large and the entire apparatus becomes expensive.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of such a point. An engine drive power generator is designed to reduce noise from a structural point of view, thereby improving the cooling efficiency and reducing noise. It is to provide a power generation device.

[0013]

The present invention achieves the above object as follows. The engine-driven power generator according to claim 1, wherein a generator, an engine, a radiator, and a cooling fan are installed in a main body case having an inlet and an outlet for cooling air, wherein the radiator is It is provided between the engine and the generator. Therefore, since the generator and the radiator are arranged on the upstream side of the engine, they can be cooled by low-temperature air without being heated by the heat of the engine, and the cooling efficiency is improved.

According to a second aspect of the present invention, there is provided an engine-driven power generator in which a generator, an engine, a radiator, and a cooling fan are installed in a main body case having an inlet and an outlet for cooling air. , Characterized in that an intake port, a generator, a radiator, an engine, and an exhaust port are arranged in this order from the upstream side along the flow path of the cooling air in the main body case. Therefore, the cooling efficiency of the generator and the radiator is improved, and the opening area of the intake port and the exhaust port is not restricted by the radiator, so that the degree of freedom in design is improved.

According to a third aspect of the present invention, there is provided an engine-driven power generator in which a generator, an engine, a radiator, and a cooling fan are provided in a main body case having an inlet and an outlet for cooling air. In the main body case, a generator room having the intake port and the generator, an engine room having the engine, the cooling fan, and the exhaust port are partitioned by a partition, and the radiator is provided in the partition. It is characterized by having been done.
Therefore, the main noise sources of the engine-driven power generator are the engine and the fan. By separating the engine room and the engine room by the partition, the internal noise of the generator room should be lower than that of the engine room. Thus, noise radiated from the intake port provided in the generator room can be reduced.

According to a fourth aspect of the present invention, in the engine-driven power generator according to the first, second, or third aspect, the cooling fan is disposed downstream of the radiator. And for that reason,
Since the radiator can be cooled without the cooling air being disturbed by the fan, it is possible to reduce pressure loss and fluid noise generated in the radiator. In addition, the noise of the fan itself can be reduced by reducing the size of the fan and reducing the rotation speed by reducing the pressure loss. According to a fifth aspect of the present invention, in the engine-driven power generator according to the first, second or third aspect, a cross-sectional area of the exhaust port is smaller than a cross-sectional area of the intake port. It is characterized by. Therefore, the noise radiated from the exhaust port can be reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an engine-driven power generator according to a first embodiment of the present invention and a silencing structure thereof. The engine-driven generator includes a rectangular parallelepiped main body case 10 that is elongated in the front-back (left-right direction in the drawing) direction. The main body case 10 is provided with a main body intake port 10a and a main body exhaust port 10b as openings. The partition 19 in the main body case 10 separates the engine chamber 101 including the exhaust port 10b and the engine 11 and the generator chamber 102 including the intake port 10a and the generator 12, and the engine 11 and the generator 12 Via a shaft 18.

The control device 13 such as a generator panel is provided with a switch for starting and stopping the engine 11, a meter indicating an operating state such as an engine speed and a power generation frequency, and various electric components. The engine 11
A muffler 14 for reducing exhaust noise caused by the combustion of the fuel cell is mounted.

A radiator 15 is installed in the partition wall 19 for cooling the cooling water which has passed through the water-cooled engine 11 and has become high in temperature. Further, cooling air required for heat radiation from the radiator 15 is supplied to the engine 11 by the main body case 1.
The fan 16 is installed in the engine 1
1 and the fan 16 are connected by a fan belt 17. Note that the fan 16 may be directly driven by a motor or the like instead of the fan belt 17. Further, the engine 11
And the generator 12 may be connected via a speed reducer or a speed increaser.

The fan 16 allows the duct inlet 20a
The air 40 drawn from the main body enters the generator room 102 through the main body intake port 10a, cools the generator 12, the generator panel 13 and the like, enters the engine room 101 via the radiator 15, and enters the engine 11 and the silencer 14 Is cooled and then discharged from the main body exhaust port 10b. Since the generator room 102 is on the upstream side of the airflow from the engine room 101, the generator room 102
Is not heated by the heat of the engine, and the generator 12 and the generator panel 13 can be cooled with low-temperature air and can be cooled with a small amount of cooling air as compared with the case without the partition wall 19. It leads to efficiency improvement. Also, the radiator 15 can be cooled by the cool air before cooling the engine 11, so that the cooling efficiency is improved.

Further, by providing the exhaust port 10b of the main body case and the radiator 15 in the main body case at the upper part of the housing, a high-speed air flow 46 in the engine room 101 is provided.
However, the high-temperature air 47 generated in the upper part of the engine 11 in the engine room and heated by the engine 11 and rising is quickly discharged from the exhaust port 10b, so that heat can be prevented from being trapped in the engine room 101.

The main noise sources of the engine drive generator are:
Since the engine 11 and the fan 16 are separated by the partition wall 19, the internal noise of the generator room 102 can be reduced more than the internal noise of the engine room 101, and the intake port 10a provided in the generator room 102 Noise radiated from the vehicle can be reduced.

The noise from the exhaust port 10b provided in the engine room 101 with high internal noise is generated by the generator room 102
Is higher than the noise from the opening 10a. According to the present invention, in the conventional structure of the engine-driven power generator shown in FIG.
5 is installed at the center of the main body case 10,
The size and shape of the exhaust port 10b can be set freely. Therefore, the noise radiated from the exhaust port 10b of the main body case can be reduced by making the opening area of the exhaust port 10b smaller than that of the intake port 10a.

According to the present invention, the exhaust port 10b and the intake port 10
Since the ratio of the noise radiated from the openings a can be controlled by the ratio of the opening areas, the intake duct for further reducing the noise radiated from the openings 10a and 10b by making the noise levels from the openings 10a and 10b substantially coincide with each other. The structure of the exhaust duct 30 and the exhaust duct 20 can be shared, and the cost of the entire apparatus can be reduced. Further, since there is no obstacle such as a radiator in the exhaust port 10b, the silencer 14 is
And the exhaust duct 140 is connected to the exhaust port 10.
By providing the b, noise from the muffler 14 main body can be reduced, and it is not necessary to provide an opening for the muffler 14, and exhaust gas can be discharged together with the cooling air 45.

Further, as schematically shown by arrows before and after the fan 16 in FIG.
When the fan 16 is provided close to the upstream side of 5,
Since the cooling air 42 is disturbed by the rotation of the fan 16 and the disturbed cooling air 43 directly hits the radiator 15, the pressure loss in the radiator increases, and the fluid noise secondary to the radiator due to the turbulence of the air also increases. Was.

However, when the radiator 15 is provided on the upstream side of the fan as in the present embodiment, the cooling air 41 can cool the radiator without being disturbed by the fan. Noise can be reduced. In addition, by reducing the pressure loss, the fan 16
It is also possible to reduce the noise of the fan 16 itself by reducing the size and reducing the number of revolutions. Furthermore, since the fan, which is one of the noise sources, can be kept away from the exhaust port 10b of the main body case 10, the exhaust port 10b
Radiation noise from the vehicle is reduced.

Further, by subjecting the inside of the engine room 101 or the generator room 102 to sound absorption processing, the respective internal noises can be further reduced. In particular, by performing sound absorption processing on the surface of the partition wall 19, it is possible to suppress acoustic resonance in a mode in which noise near the partition wall increases inside the main body case. A noise reduction effect is obtained.

Further, even when the engine-driven power generator is operated in an open-to-atmosphere state in which parts other than the intake port 10a and the exhaust port 10b of the main body case 10 are opened for repair and maintenance, the engine 11 is kept open by the partition wall 19. Since the surrounding high-temperature air does not flow back to the control device 13 or the generator 12, long-time operation is possible even in the open-to-atmosphere state.

FIG. 2 is a diagram showing an engine-driven power generator according to a second embodiment of the present invention and a silencing structure thereof. Here, a radiator 15, an engine 11, and a generator 12 are installed on a base 51 in the main body case 10, and the radiator 15 is provided between the engine 11 and the generator 12. The base 51 is supported by the main body case 10 via the vibration-proof rubber 50.

According to the present embodiment, since the cooling air 41 passing through the radiator 15 can directly cool the main body of the engine 11, the cooling efficiency of the engine 11 can be improved. Therefore, since the size of the engine 11 and the generator 12 can be reduced, the conventional partition wall 19 shown in FIG. 1 is unnecessary or the area can be reduced, so that the size of the main body case 10 can be reduced.

By providing the engine fan 16 alone at the exhaust port 10b, the differential pressure between the air in the engine room 101 and the generator room 102 is used, and the radiator cooling efficiency is improved by using the entire area of the radiator 15. It is possible. That is, as shown in FIG. 3, in the case of the conventional structure in which a fan is installed near the radiator, a reverse flow of air occurs due to uneven pressure difference between the air before and after the radiator.
As in the embodiment shown in FIG. 2, the backflow of air can be prevented by installing the fan 16 alone in the exhaust port 10b.

Further, it is possible to prevent the secondary noise from being generated from the radiator due to the disturbance generated by the fan. Further, by providing the flow path 160 for guiding the cooling air around the fan, the backflow of the flow around the fan 16 can be effectively prevented. By improving the cooling efficiency and preventing the backflow of the flow, the size of the fan 16 and the cross section of the exhaust port 10b can be reduced, so that the noise generated from the main body can be reduced.

Further, the cooling fins constituting the radiator 15 are inclined to set the cooling fins substantially in parallel with the flow direction 41 of the air to the radiator, and installed so that the flow passing through the radiator can directly cool the engine 11. By doing so, the cooling efficiency of the engine 11 by the cooling air can be further improved, and the pressure loss of the radiator can be reduced. Furthermore, by making the uppermost end 31 of the wall surface constituting the duct exhaust port 30a higher than the exhaust duct 140 of the muffler, it has the effect of a soundproof wall that reduces the diffusion of noise radiated from the exhaust duct. Is also possible.

[0034]

As described above, according to the present invention, a low-cost engine-driven power generator capable of achieving both improved cooling efficiency and low noise can be provided by reducing the noise of the engine-driven power generator from a structural point of view. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of an engine-driven power generator according to the present invention.

FIG. 2 is a cross-sectional view of a main part showing another embodiment of the engine-driven power generation device of the present invention.

FIG. 3 is a cross-sectional view of a partial structure of a conventional engine-driven power generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Main body case 10a Intake port 10b Exhaust port 11 Engine 12 Generator 13 Control device (Generator panel) 14 Silencer 15 Radiator 16 Cooling fan 17 Fan belt 18 Shaft 19 Partition wall 20 Intake duct 30 Exhaust duct 30a Duct exhaust port 31 Exhaust port Uppermost end 40, 41, 42, 43, 45 Cooling air 46 High-speed air flow 47 High-temperature air 50 Vibration-proof rubber 51 Base 100 Internal space 101 Engine room 102 Generator room 140 Exhaust duct 160 Cooling air guide flow path

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Watanabe ▲ Shin ▼ ▲ Toku ▼ 502 Kandate-cho, Tsuchiura-city, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. No.2 in Hitachi Engineering Services Co., Ltd.

Claims (5)

[Claims] 1. An engine-driven power generator in which a generator, an engine, a radiator, and a cooling fan are installed in a main body case having a cooling air intake port and an exhaust port, wherein the radiator includes the engine, the generator, An engine-driven power generator, which is provided between the two. 2. An engine-driven power generator in which a generator, an engine, a radiator, and a cooling fan are installed in a main body case having a cooling air intake port and an exhaust port, and a cooling air flow path in the main body case. , An intake port, a generator, a radiator, an engine, and an exhaust port are arranged in this order from the upstream side. 3. An engine-driven power generator in which a generator, an engine, a radiator, and a cooling fan are provided in a main body case having a cooling air intake port and an exhaust port, wherein the main body case includes the intake port and the cooling port. An engine room having a generator, and an engine room having the engine, the cooling fan, and the exhaust port are partitioned by a partition, and the radiator is provided in the partition. . 4. The engine-driven power generator according to claim 1, wherein the cooling fan is disposed downstream of the radiator. 5. The engine-driven power generator according to claim 1, wherein a cross-sectional area of the exhaust port is smaller than a cross-sectional area of the intake port.