JPH07332088A - Internal combustion engine radiator cooling fan cover - Google Patents

Abstract

PURPOSE:To effectively cool an engine by means of the wind generated along with the rotation of a rotary fan by providing a plurality of stream fairing vanes to deflect a cover which covers the rotary fan for cooling a radiator so that the wind which flows in the peripheral direction of the rotary fan is deflected in the axial direction o the rotary fan. CONSTITUTION:The fan 2 attached to the output shaft 6 of an engine 1 sucks air through a radiator 5 toward the engine 1, cooling the engine 1. A shroud 4 is provided between the radiator 4 and the fan 2 from the radiator 5, but in this case, the shroud 4 is provided with the first cylindrical member 8 which extends toward the output shaft 6. This cylindrical member 8 is provided with a plurality of stream fairing vanes 7 radially extending toward the output shaft 6 downstream of the fan 2, and a second cylindrical member 11 extending toward the output shaft 6 is provided at the internal end section of each fairing vane 7. Each fairing vane 7 has a wind deflecting surface 71 opposing to the rotary direction of the fan, and a net 3 is attached to this fairing vane 7 downstream of the vane 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for covering a rotary fan for improving the efficiency of heat exchange between a radiator for cooling a refrigerant used in an internal combustion engine and the atmosphere.

[0002]

2. Description of the Related Art Conventionally, such a cover is made of a wire mesh to prevent human contact with the rotating fan.

[0003]

SUMMARY OF THE INVENTION The present invention not only prevents human contact with the rotary fan, but also efficiently cools the combustion chamber of the internal combustion engine with the wind generated by the rotation of the rotary fan. The object is to provide a radiator cooling fan cover that can be used.

[0004]

According to the present invention, the cover for covering the rotary fan for cooling the radiator spreads in both the direction not orthogonal to the rotation axis of the fan and the radial direction of the fan, and Circumferential direction of the fan caused by rotation (direction substantially orthogonal to the fan rotation axis)
A plurality of flow straightening vanes with a wind deflecting surface for deflecting the rotating airflow flowing therethrough towards the direction of the fan's axis of rotation.

Generally, it is preferable that the flow straightening vanes extend substantially radially from the vicinity of the rotation axis of the fan toward the outer circumference of the fan. Between the plural straightening vanes extending radially,
A space for passing air flowing in a direction substantially orthogonal to the rotation axis of the fan is formed. It is preferable that the space be expanded outward in the radial direction of the fan to facilitate passage of wind from the outer periphery of the fan, which has a high moving speed. Further, the thickness of the flow straightening vanes is smaller than the width of the wind deflecting surface in the direction of the fan rotation axis. Therefore, the flow straightening vanes are strongly deflected by the flow straightening vanes in the direction of the fan rotation axis. The flow of wind is almost undisturbed.

It is preferable that the radially outer portion and / or the radially inner portion of the straightening vanes are connected by a tubular member. It is preferable that the tubular member surrounds the radial outer periphery of the rotary fan and deflects and guides the wind generated by the rotary fan outward of the radius toward the wind deflecting surface.

[0007]

According to the present invention, the plurality of flow straightening vanes of the cover covering the rotary fan spread in both directions not orthogonal to the rotation axis of the fan and the radial direction of the fan, and are generated as the fan rotates. Since there is a wind deflection surface that deflects the wind flowing in the circumferential direction of the fan (direction substantially orthogonal to the rotation axis of the fan) toward the direction of the rotation axis of the fan,
Most of the wind generated by the rotation of the rotary fan is directed toward the combustion chamber of the internal combustion engine, which is arranged on the downstream side of the wind with respect to the radiator and the rotary fan, and promotes air cooling of the internal combustion engine. It is possible to prevent a person from approaching the rotating fan from the engine side.

If the radially outer portion and / or the radially inner portion of the flow straightening vanes are connected by a tubular member extending substantially parallel to the axis of rotation, the support rigidity of the flow straightening vane is improved. At the same time, it is effective to deflect the wind in the radial direction of the fan toward the flow straightening vanes.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a fan 2 is attached to an output shaft 6 extending from an engine 1, and the fan 2 rotates. The fan 2 draws air toward the engine 1 through the radiator 5, promotes heat exchange between engine cooling water and air in the radiator 5, and cools the engine 1 by air. A shroud 4 that prevents a person from entering between the fan 5 and the radiator 5 is provided from the radiator 5, and the shroud 4 supports a first cylindrical member 8 that extends substantially in the direction of the output shaft 6. First tubular member 8
May be accompanied by an opening, but it is important not to largely prevent the air flowing in the first tubular member 8 from being guided toward the engine 1. From the first tubular member 8, the fan 2
A plurality of flow straightening vanes 7 extending toward the output shaft 6 are provided on the downstream side of the. A second tubular member 11 extending substantially in the direction of the output shaft 6 is provided on the radially inner portion of the flow straightening vanes 7. The flow straightening vanes 7 are provided with wind deflecting surfaces 71 that face each other in the traveling direction of the fan. The second tubular member 11 may be provided with an opening, but it is important that the air flowing on the outer periphery of the second tubular member 11 is not significantly hindered from being guided toward the engine 1. The net 3 is attached to the downstream side of the flow straightening vanes 7. The net 3 surely prevents a person from coming into contact with the fan 2 therethrough, and does not prevent the passage of air,
A large number of openings are formed with sufficient size so that the air flow direction is not deflected as much as possible. The net 3, the flow straightening vanes 7, the first tubular member 8 and the second tubular member 11 form a cover that covers the fan 2.

As shown in FIG. 2, the twist angles of the fan 2 and the flow straightening blades 7 are opposite to each other, and the vortex flow generated by the rotating fan 2 and rotating about the output shaft 6 advances toward the engine. Converts to a straight flow in which the flow is suppressed. That is, the rotational energy of the vortex is converted into straight energy.

As shown in FIG. 3, the output shaft 6 of the straightening vane 7 is
The dimension W in the direction of the
Is larger than the finger length L so as not to contact the passage surface 10 at the downstream end of the fan 2.

[Brief description of drawings]

FIG. 1 is a schematic partial cross-sectional view showing a cover according to the present invention.

FIG. 2 is a schematic perspective view showing the cover according to the present invention with the net half removed.

FIG. 3 is a schematic partial cross-sectional view showing a positional relationship between a cover and a fan according to the present invention.

[Explanation of symbols]

 1 Engine 2 Fan 3 Net 5 Radiator 6 Output Shaft 7 Rectifier Blade 8 First Cylindrical Member 11 Second Cylindrical Member

Claims (4)

[Claims] 1. A cover for covering a rotary fan for cooling an internal combustion engine radiator, which spreads in both a direction not orthogonal to a rotation axis of the fan and a radial direction of the fan, and is generated as the fan rotates. A cover having a plurality of flow straightening vanes with a wind deflecting surface that deflects wind flowing in a circumferential direction of the fan toward a direction of a rotation axis of the fan. 2. The cover according to claim 1, wherein the flow straightening vanes are connected by a tubular member. 3. The cover according to claim 1, wherein the thickness of the flow straightening vanes is smaller than the dimension of the wind deflecting surface in the direction of the fan rotation axis. 4. The cover according to claim 1, wherein a space is formed between the flow straightening vanes, and the space expands radially outward of the fan.