JPH04208640A - Device for removing dust from cooling air-in engine - Google Patents

Abstract

PURPOSE:To separate most dust from the open air taken into an engine room by a cooling fan and supply an air-cooled intake cooler with clean cooling-air having little dust by guiding the open air into an air guide, and whirling the open air by guide vanes. CONSTITUTION:In a dust removing device 1, an air guide 1a covers a cooling-air path leading from a forced cooling fan 2 to an air-cooled intake cooler 3. In the air guide 1a, an guide vanes 1b are disposed in a ring to have angles of inclination toward the flowing direction of cooling-air and to whirl the cooling- air. On the front end of the air guide 1a, the rear end of a shroud 4 is opened to guide the cooling-air to the intake cooler 3 and a dust discharge outlet 1c is formed in a gap between the outer face of the shroud 4 and the inner face of the air guide 1a. On the other hand, a shroud 6 is installed between the intake cooler 3 and the core of a radiator 5 to cover a cooling-air path leading from the core of the intake cooler 3 to the core of the radiator 5. This whirls the cooling-air to separate dust from the cooling-air by centrifugal force.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a dust removal device for engine cooling air.

[Prior Art] Vehicle-based construction machines, such as bulldozers, have an engine mounted on the front of the vehicle body, a push-out cooling fan in front of the engine, and an air-cooled fin-type heat exchanger (for dissipating heat from engine cooling water). (hereinafter referred to as a radiator) is installed. The outside air sucked in from the side or above the engine by the rotation of the push-out type cooling fan is blown onto the radiator through the push-out type cooling fan, exchanges heat with the cooling water flowing down inside the tube of the radiator core, and then flows toward the front of the vehicle. It is discharged.

Also, depending on the environmental conditions of the operating area, a suction type cooling fan may be used instead of the extrusion type cooling fan.

BACKGROUND ART In recent years, engines equipped with a supercharger and a charge air cooler have been increasingly used as engines become more powerful, lighter, and have less exhaust gas. The charge air cooler is a heat exchanger that cools the high-temperature air compressed by the supercharger before supplying it to the cylinders, but because it is required to have high cooling capacity and be lightweight, it uses tubes, An air-cooled supply air cooler is used, with both fins made of aluminum alloy and a larger heat dissipation area. The air-cooled supply air cooler is generally installed between the cooling fan and the radiator in the case of a push-out cooling fan, or in front of the radiator in the case of a suction-type cooling fan, to increase cooling efficiency. ing.

[Problem to be solved by the invention] Conventionally used oil coolers that cool radiators for construction machinery and hydraulic oil for driving work equipment, etc., generally have tubes and fins made of iron, and cannot be operated in areas with a certain amount of dust. However, the tubes and fins are less likely to wear out, and water or oil leakage from the tubes is less likely to occur. However, since the air-cooled supply air cooler is made of aluminum alloy, when cooling air containing a large amount of dust is blown onto it, the tubes and fins are worn away, causing holes in the tubes and deformation of the fins. Therefore, there is a problem in that the operating conditions must be limited.

In addition, cooling air containing a large amount of dust tends to clog the cores of air-cooled supply air coolers and radiators, reducing cooling capacity, so the cores must be cleaned frequently.

The present invention focuses on the above conventional problems and provides an engine cooling air dust removal device that can easily separate dust contained in cooling air that cools an air-cooled charge air cooler and a radiator. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, an engine cooling air dust removal device according to the present invention includes a supercharger and an air-cooled air supply that cools compressed air heated by the supercharger. In a water-cooled engine equipped with a cooler, a wind guide kite that passes cooling air to cool the air-cooled charge air cooler, a large number of guide vanes provided in the wind guide and arranged in an annular shape, and this guide The structure includes a dust exhaust port that discharges dust separated by the swirling motion of the cooling air passing through the blades.

[Operation] According to the above configuration, the cooling air that cools the air-cooled supply air cooler is guided into the air guiding guide, and the guiding blades give the cooling air a swirling motion. Therefore, the dust contained in the cooling air is Relatively large particles are separated by the centrifugal force of the swirling flow and are discharged from the dust outlet. Therefore, the cooling air flowing into the air-cooled charge air cooler becomes clean air with less dust, and wear and deformation of the air-cooled charge air cooler can be drastically reduced. Also, the air-cooled charge air cooler and radiator are less likely to become clogged.

[Example] Hereinafter, an example of the engine cooling air dust removal device according to the present invention will be described in detail with reference to the drawings.

Fig. 1 is an explanatory diagram of a dust removal device for an engine equipped with a supercharger and an air-cooled charge air cooler equipped with a push-out cooling pad; Fig. 2
The figure is an explanatory diagram when the engine shown in FIG. 1 is mounted on a bulldozer. This dust removal device 1 encloses a cooling air passage from a push-out type cooling fan 2 to an air-cooled supply air cooler 3 with an air guiding guide 1a, and has a cooling air passage inside the air guiding guide F' la with respect to the cooling air flow direction. Guide vanes 1b having an inclination angle and swirling the cooling air are arranged in an annular shape. Also said wind guide'! The rear end of a shroud 4 that guides cooling air to the air-cooled supply air cooler 3 is opened at the front end of a, and the gap between the outer periphery of this shroud 4 and the inner periphery of the air guide guide F' 1 a is used for dust exhaust. It forms an outlet 1c. A shroud 6 is provided between the air-cooled charge air cooler 3 and the radiator 5,
It encloses the cooling air passage from the core of the air-cooled supply air cooler 3 to the core of the radiator 5.

The outside air sucked into the engine room 7 is pushed into the wind guide FIa by the push-out cooling fan 2, becomes a swirling airflow by passing through the guide vanes 1b, and moves forward in a spiral inside the wind guide F'la. do. At this time, the dust contained in the inhaled outside air has a higher specific gravity than air, so
The dust gathers near the inner wall of the wind guide kite 1a due to centrifugal force and is discharged from the dust outlet 1c. The cooling air from which most of the dust, including relatively large particles, has been removed flows into the core of the air-cooled charge air cooler 3 from the shroud 4 that opens in the guide guide F'la, and as it passes through the shroud 4, Cools the air-cooled supply air cooler 3. The cooling air that has passed through the air-cooled charge air cooler 3 flows into the core of the radiator 5 through the shroud 6, cools the radiator 5, and is then pushed out toward the front of the vehicle body.

Figure 3 is an explanatory diagram of a dust removal device for an engine equipped with a supercharger equipped with a suction type cooling fan and an air-cooled charge air cooler.
A dust removal device 1, an air-cooled air cooler 3, a radiator 5, and a suction type cooling fan 8 are arranged in order from the front to the rear of the vehicle body. A guide vane ib is provided at the inside front part of the air guide guide 1a of the dust removal device 1, and the dust contained in the outside air taken in from the front of the vehicle body is separated as in the case of a push-out cooling fan, and the dust is removed from the dust outlet IC. It is discharged.

The above embodiment has been explained by taking as an example a bulldozer that has an engine mounted on the front of the vehicle body, but is not limited to this. The present invention can also be applied to wheel-type excavation and loading machines, etc., or various vehicles other than construction machines.

[Effects of the Invention] As explained above, in the present invention, the outside air taken into the engine room is guided by the cooling fan into the wind guiding kite, and the guiding blades give the outside air a swirling motion. Most of the contained dust can be easily separated, and clean cooling air with less dust can be supplied to the air-cooled supply air cooler. Therefore, wear and deformation of the core of the air-cooled charge air cooler can be drastically reduced, and the durability of the air-cooled charge air cooler can be greatly improved.

Furthermore, the amount of dust that accumulates on the cores of the air-cooled charge air cooler and radiator is reduced, making it possible to extend core cleaning intervals and shorten maintenance time.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a cooling air dust removal device for an engine equipped with a supercharger and an air-cooled charge air cooler according to an embodiment of the invention, and Fig. 2 shows the dust removal device shown in Fig. 1. FIG. 3 is an explanatory diagram of a case where the apparatus is installed on a bulldozer, and FIG. 3 is an explanatory diagram of a dust removal device for cooling air for an engine equipped with a supercharger equipped with a suction type cooling fan and an air-cooled charge air cooler. 1...Dust remover 1a...Guiding guide lb...Guiding vane IC...Dust discharge port 3...Air-cooled supply air cooling Applicant Komatsu Ltd. Representative (patent attorney) Yoshihiko Hashizume

Claims (1)

[Claims] In a water-cooled engine equipped with a supercharger and an air-cooled charge air cooler that cools compressed air heated by the supercharger,
A wind guide guide through which cooling air cools the air-cooled supply air cooler, a large number of guide vanes arranged in an annular manner inside the wind guide, and a swirling movement of the cooling air passing through these guide vanes separate the air-cooled supply air cooler. A dust removal device for cooling air for an engine, characterized in that it is equipped with a dust exhaust port for discharging dust that has been removed.