JPH0486321A - Low noise engine cooling device - Google Patents

Abstract

PURPOSE:To contract length in the axial direction and reduce noise by constituting a guide vane cross section share of an approach section and a direction change section in a device where a stator having a plurality of guide wanes for changing air flow is arranged between a radiator and a fan. CONSTITUTION:A heat radiation mechanism of an industrial vehicle and the like is provided with a radiator 6 for radiating heat of engine cooling water flowing in a tube arranged inside thereof by means of air flow generated by a fan 2 driven by an engine 1. A stator 4 having a plurality of guide wanes 5 for changing air flow, which introduce air flow almost orthogonally to the radiator 6 to enhance cooling efficiency thereof is also provided. A cross section shape of the guide vane 5 is constituted of a straight line part approach section H parallel to a flow-in angle theta0 of air flow C generated by rotation of the fan 2 in the arrow S direction, and a direction change section R comprising a circular arc of a radius of 100-150mm. Accordingly, length L1 of the stator 4 is contracted to shorten length L2 of a cooling device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to an engine cooling system used in industrial vehicles, and particularly to a low-noise engine cooling system.

[Conventional technology]

The structure of a heat dissipation mechanism for engine cooling water in a conventional industrial vehicle driven by an engine is as shown in FIG.

That is, 1 is an engine, 2 is a fan driven and rotated by the engine, and 6 is engine cooling water that flows through the holes provided inside by the airflow generated by the rotation of the fan. This is a radiator that dissipates heat. Further, 3 is a shroud for efficiently transmitting the airflow generated by the fan 2 to the radiator 6, and 4e is a shroud that transmits the airflow C1 caused by the rotation of the fan 2 in the direction of the arrow S at almost right angles to the radiator 6. The stator is equipped with a plurality of guide vanes 5A for converting airflow to improve the cooling efficiency of the radiator. 7 is a belt mechanism that connects the engine and the rotating mechanism of the fufun.

FIG. 4 is a cross-sectional view of a guide vane and a fan, and the cross-sectional shape of the guide vane 5A is at an angle θ of the air flow caused by the fan 2 with respect to the direction perpendicular to the radiator 6. is formed into a circular arc in order to convert the inflow angle θ1 into the radiator, so that the direction of the airflow can be changed smoothly.

Moreover, IIIW of the guide vane 5A of the stator 4A is made large enough to shield the engine room B when viewed from the A side of the radiator, thereby reducing noise leaking to the outside from the radiator.

[Problem to be solved by the invention]

The velocity triangle of the airflow caused by the fan is the fourth
As shown in the figure, the peripheral speed U of the fan, the absolute speed CI of the air
, the relative velocity w1 of the air, and the average axial velocity C0 of the air. Therefore, the inlet angle θ of the air flow. is calculated using the following formula.

θo=jan−' CfU+ −Co−tan(90°
-β))/Co] Ul Peripheral speed Co of Nian Anne: Axial average speed of wind β Twisting angle θ of Nian Anne. A stator is provided between the radiator and the fan in order to change the direction of the air flow in the direction of θ to a direction approximately perpendicular to the radiator, that is, at an angle θ close to O. As mentioned above, the guide vanes of the stator form a circular arc. Moreover, since the width W is increased as shown in FIG. 4 for sound insulation, the length in the axial direction is 1.3 longer, and therefore the length L4 of the cooling device is also longer. This is inconvenient when mounted on a vehicle.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a low-noise engine cooling device with a short axial length.

[Means to solve the problem]

In order to achieve the above object, in the first aspect of the low-noise engine cooling device according to the present invention, a plurality of guides for air flow conversion are provided between the radiator for engine cooling water heat radiation and the fan for blowing air from the radiator. In an engine cooling system in which a stator having blades is disposed, the cross-sectional shape of the guide blade includes a run-up section consisting of a straight line parallel to the direction of the air flow supplied from the fan, and a radius of 100 mm or more, ], 50 m
The second invention is characterized in that a sound absorbing material is attached to the guide vane.

[Effect]

According to the above configuration, the cross-sectional shape of the guide vane is formed by the run-up section parallel to the direction of the airflow supplied from the fan and the direction change section made of an arc, so the airflow changes direction smoothly. will be done. Furthermore, since there is a run-up section, the width of the guide vanes can be increased, and shielding in the axial direction is also possible.Furthermore, by pasting a sound absorbing material on the guide vanes, the noise components of the airflow can be absorbed.

〔Example〕

Embodiments of the low-noise engine cooling device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view of the guide vanes 5 of the stator 4 and the fan 2, and the cross-sectional shape of the guide vanes 5 is determined by the inflow angle of the air flow C3 caused when the fan 2 rotates in the direction of arrow S. θ. The run-up section H is a straight line parallel to , and the radius is l O
It is constituted by a direction change section R consisting of a circular arc of 0 mm or more and 150 mm or less. 11 of the guide vanes 5 is equal to the conventional TIIW.

Next, to explain the operation, the airflow C1 generated by the fan 2 flows along the run-up section H, is direction-changed by the direction-changing section R, and the airflow inflow angle θ is changed. is θ
1 and flows into the radiator 6. In this case, since the radius of the arc portion is 100 degrees or more, the direction of the airflow is changed smoothly. Also, the radius of the arc part] 50 m
Since the length is less than m, the length Ll of the stator shown in FIG. 2 can be made smaller, and therefore the length L2 of the cooling device can also be made smaller.

Further, since the width of the guide vane 5 is W, it is sufficiently shielded from the A side of the radiator, thereby reducing noise leakage. moreover,
A sound absorbing material may be attached to both the front and back sides of the guide vane, thereby absorbing noise components of the airflow flowing through the duct formed by the Sikoroud and the guide vane, thereby reducing noise in the engine room.

〔Effect of the invention〕

As described in detail 17 above, in the present invention, the cross-sectional shape of the guide vanes of the stator is composed of a linear run-up section and an arcuate section with a radius of 150 mm or less, so the width of the guide vanes is the same as that of the conventional one. Nevertheless, the axial length can be reduced, and the length of the cooling device can also be reduced. Moreover, it is possible to sufficiently shield the radiator applicant, and furthermore, by pasting a sound absorbing material on the guide vanes, noise can be reduced, and a low-noise engine cooling device that is convenient for mounting on a vehicle can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the guide vane and fan of the engine cooling device of the present invention, FIG. 2 is an overall configuration diagram of the engine cooling device of the present invention, and FIG. 3 is an overall configuration diagram of a conventional engine cooling device.
FIG. 4 is a sectional view of a guide vane and a fan of a conventional engine cooling system. ■++Fist Effenjin 20+Huan

Claims (2)

[Claims] (1) In an engine cooling system in which a stator having a plurality of guide vanes for airflow conversion is disposed between a radiator for engine cooling water heat dissipation and a fan for blowing air to the radiator, the cross-sectional shape of the guide vanes is A low-noise engine cooling device comprising a run-up section consisting of a straight line parallel to the direction of air flow supplied from the fan, and a direction changing section consisting of a circular arc with a radius of 100 mm or more and 150 mm or less. . (2) The low-noise engine cooling device according to claim (1), wherein a sound absorbing material is attached to the guide vane.