JPH03225017A - Engine cooling device - Google Patents

Abstract

PURPOSE:To efficiently cool an engine by installing an air stream conversion mechanism, consisting of at least one guide blade or more having a prescribed curved shape, between a fan and a radiator. CONSTITUTION:As for an engine cooling device consisting of a radiator 5 for heat radiation of the cooling water of an engine 1 and a blowing fan 2 to the radiator 5, an air stream conversion mechanism 4 consisting of at least one guide blade is installed between the fan 2 and the radiator 5. The guide blade of the air stream converting mechanism 4 has a prescribed curved shape for converting the rotary air stream supplied from the fan 2 in the rectilinear direction for the whole surface of the radiator 5. Accordingly, the air stream in a cooling passage is formed uniformly in the parallel direction for the gap between a tube and a fin in all the area of the radiator 5. Accordingly, the engine cooling device having high efficiency can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine cooling device mainly used for industrial vehicles, and particularly to an engine cooling device with good cooling efficiency.

[Prior Art] 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, in the figure, 1 is an engine, 2 is a fan driven and rotated by the engine, and 5 is an air flow generated by the rotation of the fan, which causes engine cooling water to flow through a tube provided inside. This is a radiator that radiates heat.

Further, 3 is a shroud for efficiently transmitting the airflow generated by the fan 2 to the radiator 5, and 6 is a belt mechanism that connects the engine to an external rotating mechanism.

[Problems to be Solved by the Invention] -a. The radiator is composed of a tube through which engine cooling water flows and fins for dissipating the heat of the engine cooling water that is absorbing the heat of the engine flowing through the tube. It consists of many voids with a certain depth. Therefore, according to the conventional method described above, the engine cooling water flowing through the tube is cooled by the air flow flowing through the gap.

It is therefore desirable that the air flow into the radiator be uniformly perpendicular to the entire area of the radiator, ie parallel to the air gap.

However, according to the above-mentioned conventional method, there is a limit to how the airflow generated by the rotating fan can be made to flow parallel to the radiator gap due to the shape of the fan blades. For this reason, air flows obliquely into the deep gap of the radiator in a complicated flow, causing collision and reflection of the airflow, resulting in loss. Furthermore, due to the existence of a rotating shaft that constitutes the center of the fan and the difference in the rotational speed of the blades in the diametrical direction of the fan, the airflow is not uniform over the entire area of the radiator, and the The flow may flow in the opposite direction, which causes a decrease in the cooling efficiency of the radiator.

In addition, reducing engine noise in industrial machinery has become a major problem.

The present invention is based on the above 1. It is an object of the present invention to provide an engine cooling device that is efficient and can obtain a sound absorption effect by solving the following problems.

[Means for Solving the Problems] In order to achieve the above object, an engine cooling device based on the present invention includes an engine cooling water heat dissipation radiator;
In the engine cooling device comprising the radiator fan, at least one guide vane having a predetermined curved shape converts the rotating airflow supplied from the fan into an airflow flowing in a direction perpendicular to the entire surface of the radiator. An air flow conversion mechanism is provided between the fan and the radiator. Further, the predetermined shape of the guide vane is such that the side of the guide vane closer to the fan is parallel to the direction of air flow determined by the shape and twist of the fan blade, and the side of the guide vane closer to the radiator is perpendicular to the radiator, and in the middle thereof, the shapes of the guide vanes on both sides are smoothly connected, and the airflow around the guide vanes is inclined in the direction of guiding it to the center, and The external shape of the air flow conversion mechanism is that the side of the air flow conversion mechanism near the fan is circular to match the shape of the fan, and the radiator side is quadrilateral to match the shape of the radiator. In the section, a curved surface smoothly connects the circle and the quadrilateral. In addition, sound absorbing material was attached to both sides of the guide vane.

[Operation] According to the above means, the rotational flow of air generated by the fan,
Since the cooling air flow is converted into a uniform parallel flow with respect to the voids of the radiator over the entire area of the radiator, the cooling air flow is distributed over the entire area of the radiator against the voids formed between the tubes and fins of the radiator. Therefore, it was possible to obtain an efficient engine cooling system.

Furthermore, since sound absorbing material was attached to both sides of the guide vane, the guide vane and the shroud formed a sound absorbing duct, and the noise in the engine room could be absorbed.

[Example] Hereinafter, details of the engine cooling device according to the present invention will be explained with reference to the drawings.

FIG. 1 is a configuration diagram of an engine and a cooling system, and the second
The figure shows an explanatory diagram of the operation of the engine cooling device based on the present invention.

In No. 11J, 1 is an engine, and 2 is a fan driven and rotated by the engine. Since the fan is composed of a plurality of blades formed in a plurality of twisted shapes, when it rotates, it generates an air flow with component forces in the axial direction and rotational direction, determined by the tTI structure of the blades. ing. Moreover, the direction of the airflow is disturbed in the center of the fan 2 due to the structure in which the rotating shaft and blades are housed, and the airflow is weak.

The airflow passes through the shroud 3 and enters an airflow conversion mechanism 4 based on the present invention, which is constituted by at least one guide vane, and the flow direction is modified depending on the shape of the guide vane. In other words, an airflow with component forces in the -excitation direction and rotational direction is an airflow only in the direction perpendicular to the radiator, and even in the vicinity of the extension of the moving part of the fan, it can be combined with the surrounding airflow. It is converted into a parallel flow of approximately the same strength and input to the radiator 5.

The radiator 5 is composed of a plurality of tubes 7 through which engine cooling water flows and a plurality of fins connecting the tubes 7. The air flow formed into a uniform parallel flow uniformly flows into the gap formed by the plurality of tubes 7 and the plurality of fins 9
Therefore, the engine cooling water, whose temperature has increased by 1 due to the engine heat flowing through the tube of the radiator, is radiated and cooled by the air flow.

Further, 6 indicates a heald mechanism that connects the engine and an external rotating mechanism.

Next, an example of the shape of the guide vanes constituting the airflow converting mechanism 4 will be described with reference to FIG. 2.

This is a cross-sectional view of a part of the structural diagram shown in the first IN, viewed from above, and 21 shows the cross-section of one blade of the fan.
41 is the airflow converter f'! 4 shows a cross section of one of the at least one guide vane possessed by No. 4. Further, 5 is a cross section of the radiator.

Further, arrow A indicates the direction of rotation of the fan blades 21, and arrow opening indicates the direction of air flow caused by the rotation of the fan blades 21.

Further, the arrow C indicates the direction of the air flow flowing into the guide vane 1 which constitutes the air flow converter fI4, and the direction of the air flow C is the same direction as the air flow port shown earlier. .

The air flow changes its direction of flow into the direction of arrow 2 by guide vanes 11 and enters the radiator 5 at right angles.

This explanatory diagram shows a partial cross section, and the air flow openings located around the periphery of the blades 21 of the fan are not shown in the diagram, and the air flow openings are provided in the direction of the rotation axis of the fan by the guide vanes 41. The shape of the guide vane is formed so that it flows evenly,
Guide vanes 41 near the rotation axis of the fan are formed so as to convert airflow flowing in from the periphery into an airflow in a direction perpendicular to the radiator.

Further, the outer shape of the fan side end of the airflow converting mechanism is circular to match the shape of the fan, the outer shape of the radiator side end is quadrilateral to match the radiator shape, and the middle outer shape is: The shapes of both ends are smoothly connected, and the curved surface matches the shape of the guide vane for smooth air flow direction change as described above.

Further, the curved surface of the guide vane, together with the curved surface of the external shape of the airflow conversion mechanism, is formed so that the aforementioned smooth direction conversion of the airflow can be performed.

Next, an example of an embodiment of the guide vane 41 will be described with reference to FIG.

FIG. 3 shows one guide vane constituting the airflow converting mechanism 4. As shown in FIG. In Figure 3, Figure 1 is a view of the air flow converter ti4 viewed diagonally from the windward fan side, and Figure (B) is a view of the air flow converter 4 viewed from the leeward radiator side. This is a diagram viewed diagonally. Figure (C) is a diagram of the front of the center of the airflow converter $14 viewed from the radiator side, which is the leeward side.

In each figure, numeral 41 shows only one of the at least one guide vane constituting the airflow conversion mechanism that changes the direction of the airflow, and numeral 42 fixes the guide vane. It is a fixed axis. Further, a indicates the fan side of the fixed shaft 42, and b indicates the radiator side of the fixed shaft 42.

In figure (C), arrows indicate the direction of airflow.

In addition, the dashed-dotted line indicates the connection of a curved surface with a uniform slope between the adjacent dashed-dotted line, and the curved surface shown in the figure allows the airflow flowing from the fan in the direction of the arrow to reach the radiator. On the other hand, as shown in FIG. 2, it is supplied as a uniform perpendicular air stream.

The shape shown in FIG. 3 is an example of the guide vane according to the present invention, and the guide vane smoothly guides the airflow in accordance with the number of vanes constituting the fan, their shape, and the state of twisting. By forming it into an appropriate shape that allows the direction to be changed, the desired purpose can be achieved.

Also, when it is necessary to reduce engine noise,
By pasting sound-absorbing materials on both the front and back sides of the guide vane, the noise components of the airflow guided through the duct formed by the shroud and the guide vane are absorbed, thereby achieving the intended purpose. .

[Effects of the Invention] As explained above, according to the present invention, the rotating flow of air generated by the fan is converted into a uniform parallel flow with respect to the air gap of the radiator over the entire area of the radiator. Therefore, the cooling air flow uniformly flows in a direction parallel to the gap formed between the tube and fin of the radiator over the entire area of the radiator, and therefore, an efficient engine cooling system can be obtained. You can get excellent results.

In addition, since sound-absorbing material is pasted on both sides of the guide vane, the guide vane and shroud form a sound-absorbing duct, which absorbs noise within the engine room and prevents the noise from leaking to the outside. You can get excellent results.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an engine cooling system to which the present invention is applied. Fig. 2 shows the behavior of an engine cooling system to which the present invention is applied (% explanatory diagram), Fig. 3 is a guide vane shape diagram of an embodiment to which the present invention is applied, and Fig. 4 is a configuration diagram of a conventional engine cooling system. 1... Engine, 2... Fan, 3... Shroud. 4... Air flow conversion. Mechanism, 5...Radiator, 6...Belt mechanism, 41...Guide vane, 42...... Fixed axis.

Claims (4)

[Claims] (1) In an engine cooling system consisting of a radiator for heat dissipation of engine cooling water and a fan for blowing air to the radiator, a predetermined curve that converts the rotating airflow supplied from the fan into an airflow flowing perpendicular to the entire surface of the radiator. An engine cooling device characterized in that an airflow converting mechanism comprising at least one guide vane having a shape is provided between the fan and the radiator. (2) The predetermined shape of the guide vane is such that the side of the guide vane closer to the fan is parallel to the direction of airflow determined by the shape and twist of the fan blade, and the side of the guide vane closer to the radiator The sides are perpendicular to the radiator, and the intermediate part smoothly connects the shapes of the guide vanes on both sides and directs the airflow around the guide vanes.
The engine cooling device according to claim 1, further comprising a slope in a direction leading to the center. (3) The external shape of the air flow conversion mechanism is that the side of the air flow conversion mechanism near the fan is circular to match the shape of the fan, and the radiator side is quadrilateral to match the shape of the radiator. Claim (1) characterized in that the intermediate portion has a curved surface that smoothly connects the circle and the quadrilateral.
1), the engine cooling device described in (2). (4) The engine cooling device according to claim (1), wherein the guide vane is made of a sound absorbing material.