JPH0111938Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a forced cooling device for an engine muffler.

[Technical background of the invention] Large engines used as drive sources for generators, compressors, hydraulic equipment, etc. for railway work or civil engineering work generate considerable exhaust noise. , the role played by the muffler is important. This muffler has a cylindrical body that is partitioned with a partition wall, and a small hole is made on the side, or a pipe without any holes is inserted through it, and the exhaust gas from the engine that flows into the body is expanded, resonated, and buffered. In addition to this, the exhaust noise is reduced and muffled.

Until now, most of the ways to install this muffler were to leave the muffler body alone and fix it to the outside of the engine. However, if the muffler is left exposed in this way, it will be subject to severe vibrations and strong shocks applied during mechanical work, as well as external influences such as stones and dust, which may cause deformation or damage to the muffler. In addition, the high-temperature combustion gas from the engine becomes exhaust gas and passes through the muffler, causing the muffler body to become extremely hot. If the muffler is exposed at this time, a person may come into contact with the muffler body and become extremely hot. It is a danger.

For the above reasons, a cover like the one shown in Figure 1 has been provided for the purpose of protecting the muffler and ensuring safety.

An engine 1 and a radiator 2 for cooling the engine are fixed in the engine room R, and an exhaust port 3 is provided above the engine room R to discharge the exhaust flow from the radiator 2 into the atmosphere.
A muffler 4 is fixed to the upper surface of the engine room R, and the exhaust side of the engine 1 and an intake pipe 4a provided at one end of the muffler 4 are connected, while an exhaust pipe 4b provided on the opposite side of the muffler 4 is open to the atmosphere. A muffler cover 5 is provided above the engine room R to cover the muffler 4. A through hole 6 for an exhaust pipe 4b from the muffler is opened in the muffler cover 5.

In this conventional type, engine exhaust gas G discharged when the engine 1 is driven is sucked into the intake pipe 4a, and is discharged into the atmosphere through the exhaust pipe 4b while being muffled by the muffler 4. Further, the exhaust flow A discharged from the engine fan passes through the radiator 2, and then is directly discharged to the outside of the engine room R through the exhaust port 3.

[Problems with the background technology] However, the conventional muffler has a muffler cover 5.
When the cover is attached, the muffler 4 is sealed, so no air flow occurs inside the cover. When the engine is running, extremely high-temperature engine exhaust passes through the muffler, which causes the muffler itself to become very hot, but if there is no airflow, the muffler cover will also become extremely hot, which will hinder the cooling of the muffler. This may actually lead to faster damage to the muffler. It is also possible to cover only a part of the muffler 4 with the muffler cover 5 and allow the muffler to come into contact with the atmosphere for natural cooling, but the muffler cover 5 cannot provide sufficient protection or ensure safety, and the muffler is simply Natural cooling also does not effectively cool the muffler.

[Purpose of the invention] The purpose of the invention is to eliminate the drawbacks of the conventional type as described above, to effectively cool the muffler by forcing air into the cover, and to reduce the amount of exhaust air from the exhaust pipe of the muffler. An object of the present invention is to provide a forced cooling device for a muffler that can perform the following functions well.

[Summary of the invention] The forced cooling system for the muffler of this invention guides the exhaust air from the radiator to both the muffler itself and the exhaust pipe extending from the muffler to the exhaust port in front of the radiator, thereby effectively cooling both. At the same time, by placing the tip of the extended exhaust pipe inside the radiator's exhaust port, negative pressure is created inside the tip of the exhaust pipe, reducing the exhaust resistance of the muffler. .

[Example of idea] An embodiment of the present invention will be explained with reference to FIG.

In this embodiment, an intake pipe 4a is provided on the exhaust side of the engine 1 fixed in the engine room R, and this intake pipe 4a is connected to the muffler 4. An exhaust pipe 4b is connected to the other end of the muffler 4.
The tip of b is installed inside the end of the exhaust port 3 for the air that cooled the radiator 2, so that the exhaust direction of the exhaust pipe 4b matches the exhaust direction of the exhaust flow from the radiator 2 from the exhaust port 3. It is being A muffler cover 5 is provided to cover the two intake and exhaust pipes 4a, 4b and the muffler 4. For example, the muffler cover 5 has a discharge side opening 5a at the rear of the upper part, and an intake side opening 5b at the front of the lower part. It is installed above the engine room R so that it partially overlaps with the mouth 3.

In the cooling device of this embodiment, the engine exhaust gas G discharged by the driving of the engine 1 passes through the intake pipe 4a, is muffled by the muffler 4, passes through the exhaust pipe 4b, and is discharged to the radiator side. Head towards exhaust port 3. On the other hand, the exhaust flow A that has passed through the radiator 2 for engine cooling is discharged to the outside from the exhaust port 3, but at this time the radiator 2
Due to the exhaust flow A flowing rapidly due to the fan, negative pressure acts on the tip of the exhaust pipe 4b that opens to the exhaust port 3, so that the exhaust gas G in the muffler 4 receives suction force and smoothly flows. This improves the efficiency of both the muffler and the engine.

On the other hand, since the suction side opening 5b provided in the muffler cover 5 is disposed at the outlet of the exhaust port 3, the air A from the radiator is transferred to the suction side opening 5b.
b, flows into the cover, cools the muffler, and then flows out from the discharge side opening 5a. Here, the exhaust flow A from the radiator has a much lower temperature than the engine exhaust gas G, so by forcing it through the cover using the power of the radiator fan, the muffler Cooled effectively.

[Effects of the invention] As described above, the present invention makes it possible to forcibly send the cooling exhaust flow into the cover by overlapping a part of the muffler cover with the exhaust port of the engine exhaust flow. The muffler can be efficiently cooled without overheating. What's more, the exhaust flow from the radiator, which was previously discharged into the atmosphere, can be used without waste, and there is no need for a dedicated cooling fan for the muffler.

In particular, in this invention, the exhaust pipe of the muffler is extended to the exhaust port in front of the radiator and the exhaust pipe itself is also cooled, so the cooling efficiency of the muffler is improved compared to a system that only cools the muffler. I can do it.

Furthermore, to reduce the exhaust resistance inside the exhaust pipe that occurs as a result of extending the exhaust pipe, the tip of the exhaust pipe is placed inside the exhaust port, so the exhaust gas from the muffler receives negative pressure and is rapidly sent outside. This reduces the exhaust resistance of the muffler and increases engine efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional muffler cover and its attached state, and FIG. 2 is a cross-sectional view showing an embodiment of the forced muffler cooling device of the present invention. 1...Engine, 2...Cooling radiator, 3
...Exhaust port, 4...Muffler, 4a...Intake pipe, 4b...Exhaust pipe, 5...Muffler cover, 5a...Exhaust side opening, 5b...Intake side opening, A...Exhaust flow, G...Exhaust gas.

Claims (1)

[Scope of Claim for Utility Model Registration] In an engine device in which air from inside the engine room is sent to a radiator by a fan, and exhaust from the radiator is exhausted from an exhaust port provided in front of the radiator, the air outside the engine room is A muffler cover is provided, and a muffler that muffles engine exhaust noise is housed within this muffler cover.The muffler cover also has an intake side opening and an exhaust side opening, and the intake side opening is located in front of the radiator. an exhaust port, and extend the exhaust pipe of the muffler from inside the muffler cover to inside the exhaust port in front of the radiator;
A forced cooling device for a muffler, characterized in that the tip of the exhaust pipe is arranged inside the end of the exhaust port so that the exhaust direction of the exhaust pipe matches the exhaust direction of the exhaust flow from the radiator. .