JPH0218680Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a cooling device for cooling the engine and muffler in a motor generator using cooling exhaust air from the generator.

[Technical background of the invention] A motor generator consists of a motor and a generator.
The power from the motor drives the generator. When a motor generator is in operation, it is affected by natural convection and radiation from the engine, which is the heat source, so the entire device heats up and reaches a high temperature. Therefore, a need arises for cooling the motor generator and its muffler. The main cooling methods are liquid cooling and air cooling, but liquid cooling can be dangerous or cause problems if it leaks, so air cooling is preferred because it is highly safe. Often used, in the case of large and low,
A forced air cooling system using a fan attached to the output shaft of the generator or engine is used.

FIG. 1 shows an example of a conventional forced air cooling type motor generator. The motor generator 1 includes a motor 2 and a generator 3, each of which is fixed to a frame 4. The engine 2 and the generator 3 have cooling fans 5a and 5b fixed to their output shafts. Further, a fuel tank 6 for combustion is attached to the frame above the engine 2, and a muffler 7 is provided at an arbitrary position to muffle exhaust noise generated when the engine 2 is in operation. The engine 2 and this muffler 7 are connected by an exhaust pipe 8.

In the conventional motor generator cooling system shown in FIG.
5b rotates, and the cooling air g sucked thereby cools the motor 2 and the generator 3, respectively. After cooling, the cooling air G of engine 2 is directly
Cooling air g of the generator is supplied through exhaust ports 9a, 9b, 9c.
more emitted into the atmosphere. Further, the exhaust noise generated when the engine is operating is muffled using the muffler 7.

[Problems with the Background Art] In the conventional cooling system as described above, the engine 2 and the generator 3 are cooled separately, so the power consumed to cool the engine 2, which gets hotter, is reduced. This has the disadvantage that the power loss of the engine 2 increases. In particular, although the cooling air of the generator 3 is much lower in temperature than the cooling exhaust air from the engine 2, it is also undesirable from the point of view of cooling efficiency to discharge this directly into the atmosphere. Furthermore, although a muffler is indispensable for the engine 2, conventional cooling devices have only been used to cool the engine body and the generator, and the muffler has only been naturally cooled by the atmosphere. As a result, the cooling effect of the muffler becomes insufficient, leading to problems such as heating of the muffler and reduction in its durability.

[Purpose of the invention] The purpose of the invention is to eliminate the drawbacks of the conventional type described above and to provide a cooling device for a motor generator that can effectively cool the generator body and muffler using the exhaust gas of the generator. It is in.

[Summary of the invention] The engine generator cooling device of the invention is provided with exhaust ports on the muffler side and the engine side of a generator having a cooling fan, respectively, and these exhaust ports are arranged to face the muffler body and the engine body. At the same time, by covering the muffler with a muffler cover, the cooling exhaust from the generator discharged from the exhaust port on the muffler side is blown directly onto the muffler body, actively cooling the muffler body, and at the same time, this cooling exhaust is By flowing into the muffler cover and guiding it around the entire muffler periphery, it is possible to forcefully cool the muffler, and the engine body is also cooled using the cooling exhaust from the exhaust port on the engine side.

[Embodiment of the invention] Hereinafter, an embodiment of the invention will be described based on FIG. 2. Note that the same members as those in the conventional cooling device are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the engine 2 and the generator 3 are arranged close to each other on the left and right sides of the frame 4, and have cooling fans 5a and 5b, respectively. Above the generator 3, a muffler 7 extending from the engine 2 is disposed close to the muffler 7, and is fixed to, for example, the generator main body by a mounting base 11. Muffler-side exhaust ports 10a and 10b are provided on the top surface and upper side surface of the generator 3, and the exhaust port 10a in particular is opened to face the muffler 7. Further, a motor-side exhaust port 10c is provided on the lower side surface of the generator 3, and is opened to face the motor 2. Furthermore, a muffler cover 12 is provided to cover the main body of the muffler 7. This muffler cover 12 is attached so as to be separated from the generator 3 by a partition wall 13 provided on the frame 4, and an exhaust pipe 8 provided on the muffler 7 passes through the side surface of this cover. There is. This muffler cover 12 is provided with an intake port 14a facing the muffler side exhaust ports 10a, 10b of the generator 3, and an exhaust port 14c opened to the atmosphere on the opposite side.

In the cooling device of this embodiment having the above-described configuration, when the motor generator 1 is started, the fans 5a and 5b of the motor 2 and the generator 3 rotate to suck cooling air from the atmosphere. Engine 2 fan 5
The cooling air G sucked by a cools the engine 2 and is then discharged directly into the atmosphere. on the other hand,
The cooling air g sucked by the fan 5b of the generator 3 cools the generator 3, and then passes through its exhaust port 10a,
Head to 10b and 10c. Then, the cooling exhaust discharged from the exhaust ports 10a and 10b on the muffler side
g ₁ and g ₂ are from the intake port 14a to the muffler cover 12
flows into the interior, is guided around the main body of the muffler 7,
After forced cooling of muffler 7, muffler cover 1
It is discharged into the atmosphere from the exhaust port 14b of No. 2. In this case, in particular, the cooling exhaust gas _g1 from the exhaust port 10a provided at the top of the generator 3 is actively blown directly onto the main body of the muffler 7, so that a high cooling effect can be obtained. Further, the cooling exhaust gas g ₃ of the generator discharged from the exhaust port 10c on the engine side cools the bottom of the engine 2, and then is discharged directly into the atmosphere. That is, in the cooling device of the present invention, forced cooling of the muffler 7 is possible by directly blowing only relatively low-temperature generator cooling air onto the main body of the muffler 7 and flowing into the muffler cover 12. I have to. In addition, in this embodiment, the muffler 7 is the generator 3.
Partition wall 13 provided in the frame but above the
However, it is cut off so that the heat from the muffler 7 side is not transmitted to the generator 3.

The present invention is not limited to the above-mentioned embodiment, but a duct is provided in each exhaust part of the generator 3 to form two exhaust ports, and the cooling exhaust is sent to the muffler side and the engine side through the duct. It may be made to flow separately.

[Effects of the invention] As described above, according to the invention, the cooling air of the generator, which has hitherto been directly discharged into the atmosphere, can be fully utilized for cooling the engine and muffler. In particular, by using a combination of cooling methods that used to be used separately for the engine, generator, and muffler, the burden of cooling the engine can be reduced and the wasted power spent on cooling can be reduced, making the engine generator more efficient. This makes it possible to reduce the size and weight. In addition, by using a generator fan to create air flow in the muffler section, which was conventionally cooled naturally, the muffler body is forcedly cooled, improving the cooling efficiency of the muffler and preventing it from overheating. This has the advantage of increasing the durability of the muffler and reducing noise.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of a conventional cooling device;
The figure is a partial sectional view showing an embodiment of the motor generator cooling device of the present invention. 1...Motor generator, 2...Motor, 3...Generator, 4...Frame, 5a, 5b...Fan, 6
... Fuel tank, 7 ... Muffler, 8 ... Exhaust pipe, 10a, 10b ... Exhaust port on the muffler side,
10c...Exhaust port on engine side, 11...Mounting stand, 12...Muffler cover, 13...Bulkhead, 1
4a...Intake port, 14b...Exhaust port, G, g...
Cooling air, g ₁ , g ₂ ... Cooling air discharged from the exhaust port on the muffler side, g ₃ ... Cooling air discharged from the exhaust port on the engine side.

Claims (1)

[Scope of Claim for Utility Model Registration] A motor generator that includes a generator, a motor that drives the generator, a muffler that muffles exhaust noise generated during engine operation, and a cooling fan that cools the generator. In the cooling device, a muffler cover is provided to cover the muffler, and exhaust ports on the muffler side and the engine side are provided on the exhaust side of the generator, and the exhaust port on the muffler side is opened facing the muffler body to be cooled. 1. A cooling device for a motor/generator, characterized in that the exhaust port on the engine side is opened facing the engine main body to be cooled.