JPS5933853Y2 - Heat shielding device for air supply manifolds, etc. of turbocharged engines - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat shielding device for cooling the supply air manifold and air duct of a supercharged engine by covering the supply air manifold and air duct with a heat shielding cover that introduces cooling air. .

In a supercharged engine that uses a supercharger to increase combustion efficiency when supplying air to the intake valve of an internal combustion engine, the supercharger compresses the intake air, which generates heat at high temperatures. As the supply air passes through, the surface temperature of the air duct connecting the turbocharger and the intake manifold and the intake manifold reaches a high temperature of over 100°C, posing a risk of burns. In order to prevent direct contact with the air supply manifold or the air duct, a heat shield cover may be used to cover the high temperature part, but if the heat shield cover simply covers the high temperature part in this way, it will not be possible to prevent the air from coming into contact with the air duct or the air supply manifold. Not only is heat dissipation hindered, but heat is trapped between the heat shield cover and the air supply manifold, etc., and the heat shield cover itself becomes high in temperature, making it impossible to completely eliminate the problem of burns.

Therefore, the first purpose of the present invention is to provide a heat shield cover for the supply air manifold, etc. to cover the supply air manifold, etc., and to distribute cooling air through the air passage provided between the supply air manifold, etc. and the heat shield cover. The aim is to completely eliminate the risk of burns by cooling the heat shield cover.

In addition, as the air that leaves the turbocharger is at high temperature and high pressure as mentioned above, the compression efficiency of the turbocharger will not rise above a certain level, and therefore there is a limit to the amount of air that can be fed into the cylinder. Combustion efficiency cannot be improved beyond a certain level, but if the high-temperature supply air is cooled before entering the cylinder, it will shrink and become denser, reducing its pressure and improving the compression efficiency of the supercharger. Therefore, substantially more air flows into the cylinder and the output increases.

Furthermore, if the output is kept constant, the exhaust air temperature decreases due to the increase in the amount of air supply and cooling, which improves the durability of the engine.

Therefore, the second purpose of the present invention is to form an air passage surrounded by a heat shield cover around the supply air manifold, etc., and to guide cooling air into this, the temperature of the supply air inside the supply air manifold, etc. can be increased. The aim is to increase the engine's output by lowering the engine's engine output, and to improve the engine's durability.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an internal combustion engine 2 installed in an engine room 1. In the figure, an exhaust gas is rotated by exhaust gas sent out from an exhaust manifold 5 that collects exhaust gas discharged from a 31ri cylinder head 4 in one place. This is a supercharger that uses a turbine as a driving source, and an air duct for guiding the air supply to an air supply manifold 7 is provided at an air supply outlet 6 for sending air compressed by the supercharger 3 from the supercharger 3. 8 are connected.

The air duct 8 and the air supply manifold 7 are covered with a heat shield cover 9
An air passage 10 is interposed between the heat shield cover 9, the air duct 8, and the air supply manifold 7, and the air passage 10 is connected to a blower installed outside the engine room 1.
For example, it communicates with a communication passage 13 formed by a communication pipe 12 for guiding outside air taken in by a suction fan 11 to the air passage 10.

The installation state of the heat shield cover 9 will be explained.

The heat shield cover 9 of the air duct part is shown in the I-I cross section in Figure 1.
As shown in FIG. 2, which shows the installation state of the air duct 8, the heat shield cover 9 that covers the air duct 8 is composed of an upper heat shield cover 91 and a lower heat shield cover 92, which completely surround the air duct 8, as shown in FIG. , the mating surface 14 of the bolt 1
Alternatively, as shown in the same figure, the cover 9 may be made into a gutter-like U-shaped cross section, covering only the upper part of the air duct 8, and connecting the lower end 16 directly to the air duct with bolts 17. 8 may be coupled to the lower side surface 18 of 8.

As shown in Fig. 3, which is a view from arrow B in Fig. 1, the heat insulating cover 9 of the air supply manifold 7 is installed over the entire length of the air supply manifold 7, which is a long tube extending over multiple air pipes. The heat shield cover 9ij is integrally connected to the heat shield cover 9 that covers the air duct 8 connected to the center of the air supply manifold 7, and the heat shield cover 9 is shown as As shown in FIG. 4, which is a sectional view taken along the -
An air passage 10 provided between the heat shield cover 9 and the air supply manifold 7 communicates with the outside air at the neck 19 and lower end 20 of the air supply manifold T.

Further, if heat radiating fins 22 as shown in FIG. 5 are arranged in parallel on the outer surface 25 of the air supply manifold 7 and the air duct 8, a more efficient cooling effect of the air supply manifold and the like can be improved.

Note that the above-mentioned blower device 11 can be any type of blower such as a suction fan, blower, pump, etc. It may be of a type in which the air in the air passage 10 is led out to the outside of the engine room through the communication passage 13.

Next, to explain the flow of air in the case of a model that introduces outside air into the engine room, the air introduced into the engine room 1 by the action of the blower 11 passes through the communication passage 13 and enters the air passage 10. The flow branches into a flow toward the supercharger 3 and a flow toward the air supply manifold 7,
The flow from three directions of the supercharger passes through the air passage 10 provided around the air duct 8 and flows out from its end 23 into the engine room 1, and the flow from the direction of the air supply manifold 7 flows through the air passage 10 around the air duct 8. The air flows out into the engine room 1 from the neck 21 and lower end 20 of the air supply manifold 7 and both ends 24 of the heat shield cover 9 through the air passage 10 around the air supply manifold.

As described above, the present invention attaches a heat shield cover to the air supply manifold and air duct of a supercharged engine, and allows air to flow through the air passage provided between the heat shield cover and the air supply manifold and air duct. Since the air supply manifold, air duct, and heat shield cover are cooled, the risk of burns caused by touching the heat shield cover for the operator is eliminated, and the supply air is cooled before entering the air supply hole of each cylinder. Not only can the density of the air supply be improved and the effect of increasing output can be expected, but also the exhaust temperature is lowered due to the increase in the amount of air supply and cooling, which has the effect of improving the durability of the engine.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment including an internal combustion engine 2 installed in an engine room, FIG. 2 a s b is a sectional view taken along line I-I in FIG. 1, and FIG. FIG. 4 is a sectional view taken along the line ■-■ in FIG. 3, and FIG. 5 is a modified example of the air duct. 3...Supercharger, T...Air supply manifold, 8...Air duct, 9...Heat shield cover, 10...Air Passageway, 11...Blower device.

Claims (1)

[Scope of Claim for Utility Model Registration] (2) A heat shield cover 9 is attached to the air supply manifold T of the supercharged engine and the air duct 8 that connects the supercharger 3 and the supply air manifold 7; An air passage 10 is provided between the air supply manifold 7 and the air duct 8 to allow air to flow through the air passage 10, and the air supply manifold 7,
A heat shielding device for a supercharged engine, characterized in that it cools an air duct 8 and a heat shielding cover 9. 2. The heat shielding device according to claim 1, wherein the cooling air passage 10 is communicated with the blower 11. 3. The heat shielding device according to claim 1 or 2, wherein radiation fins 22 are provided on the outer surface 25 of one or both of the air supply manifold 7 and the air duct 8.