JPH10281098A - Cooling air introduction/exhaust device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce energy loss by changing a blast direction by making a device have a constitution that a deviation angle of a part of a wind direction changing plate is eliminated when a partial obstacle exists in a direction which is extended outward by the wind direction changing plate. SOLUTION: A fan is arranged at the rear end of a shroud by a mounting plate which is externally fitted into a fan motor. A wind direction changing plate has a boss 20 at the center, 9 sheets of fixed blades 21 are formed in the radiating direction from this boss 20 and a reinforcing ring 22 is mounted at the tip. The fixed blades 21 of this wind direction changing plate are provided with deviation angles. But, the center of a rotation P0 is determined for an origin in A, B, C of the fixed blades 21 on the side of an obstacle 12 and the A, B, C do not have deviation angles for a reference line (positional angle 0 deg.) of the angle of a straight line passing a point P1 of the root parts of the fixed blades 21 from this point P0 . Thus, an exhaust is affected by only mounting angles that the A, B, C of the fixed blades 21 have, a blast to only a partial obstacle 12 is eliminated, energy loss is reduced and blast efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan having a shroud which is used to enhance the air guiding effect of a fan for introducing cooling air to a radiator or a condenser arranged in front of an automobile engine. It relates to an improvement in exhaust air.

[0002]

2. Description of the Related Art In recent years, in automobiles, engine rooms have become smaller in order to maximize living space,
In addition, various accessories such as condensers for air conditioners, compressors, compressors for power steering, and ABS have been mounted. For this reason, the space between the fan and the engine and accessories behind it tends to be small. The condenser and the radiator have a fan for cooling the device as an essential function. The fan is rotated to create a flow of air to radiate heat. Generally, air is sucked from the front end of the vehicle, passes through a condenser and a radiator, and is exhausted from behind the fan into the engine room.

In order to improve the efficiency of the fan, a shroud is provided between the device to be cooled and the fan, and the exhaust air is rectified and immediately blows out, and is discharged toward the engine and other devices. . The extent to which the downstream end of the shroud covers the fan is referred to as the “fogging rate” of the shroud 10 with respect to the fan 6, and is represented by K = Y / X × 100 as shown in FIG. FIG. 12a, b
Is a comparison of the exhaust air from a fan with a high fogging rate and a fan with a low fogging rate. In the fan 6 with a high fogging rate, the turbulence of the air around the fan is small, and the fan 6 is covered with the shroud 10. There is little air wrap around the pressure surface. In addition, since the exhaust air from the fan 6 is prevented from spreading in the radial direction by the shroud 10, it tends to go straight backward. If the fogging rate is 60% to 70% or less (shown in FIG. 12B in the conventional example), the distance between the fan and the engine or other equipment is not affected as shown by the two-dot chain line in FIG. This is because the exhaust air of the fan diffuses in the radial direction of the fan (see FIG. 12B).

However, when the fogging rate is high (80% or more), as shown in FIG. 12A, the turbulence of the air at the outer peripheral portion of the fan is reduced, and advantages such as reduction of noise and improvement of fan efficiency are obtained. However, as shown in FIG. 10, the influence of the distance between the fan and the device such as the engine increases. This is because the exhaust air of the fan is less likely to expand in the radial direction than in the case where the fogging rate is low, and is more likely to be exhausted linearly rearward (see FIG. 12A). When the exhaust air collides with a device such as an engine (overall obstacle), energy loss occurs, and the exhaust efficiency decreases. In particular, according to the results of investigations on various fans, when the distance of the gap is about 200 mm or less, the drawback that the air volume is reduced as shown by the solid line in FIG.

The outer circumference of the blade 6b has a cylindrical ring 6
In the so-called ring fan 6 'connected by c, there are two types of fogging rates. First, the extent to which the ring 6c covers the blades 6b is referred to as the fogging rate of the ring 6c with respect to the blades 6b. FIG. 14 shows an example thereof,
Fogging ratio K2 of ring 6c to blade 6b = Y / X ×
It is represented by 100.

Secondly, there is a fogging rate for the ring fan 6 'by the shroud 10, and FIG. 13 shows an example thereof, which is represented by a fogging rate K1 = Y / X × 100.
Even these two fogging rates show the same tendency as the above-mentioned fogging rate for the shroud, and have the drawbacks indicated by 0004.

[0007]

As a countermeasure against this, the present applicant has disclosed a cooling air introducing / discharging device having a high fogging rate for a fan provided with a shroud, and having a wind direction changing plate when there is an obstacle behind the fan. It was proposed to provide an exhaust air in a direction to spread outward. As a result, the efficiency of the exhaust air has been improved, but there is a new partial obstacle in the direction changed by the wind direction changing plate, or a plurality of fans are provided. When provided, the exhaust air from adjacent wind direction change plates collide with each other, resulting in an energy loss and a decrease in exhaust efficiency.

More specifically, referring to FIGS. 9 and 10, the condenser 4 and the radiator 5 are provided side by side, and fans 6 and 6 having a plurality of shrouds 10 and 10 are arranged downstream thereof. The wind is introduced from the front of the vehicle, cools the heat exchangers 4 and 5, and the exhausted wind is guided by the wind direction change plate 13 provided on the downstream side of the fans 6 and 6 in the direction of spreading outward. And the rear engine 7
However, the exhaust air spread outwardly hits the battery 12 provided on the left side in the engine room 1, and energy loss occurs in a part of the exhaust air and the exhaust air efficiency is reduced. A new problem has arisen that causes a decrease in

Further, as shown in FIG.
In the case of having the above, the two wind direction change plates 13 and 13 are provided, so that the exhaust air collides with a portion adjacent to the two, energy loss occurs, and the exhaust efficiency is reduced.

Therefore, the present invention reduces the exhaust efficiency even if there is a partial obstruction before the exhaust air is spread outward by a wind direction changing plate provided behind the fan and is exhausted. The purpose is to prevent the problem. It is another object of the present invention to prevent a collision of exhaust air from adjacent parts when a plurality of fans are provided and a plurality of wind direction change plates are correspondingly provided.

[0011]

According to the present invention, there is provided a cooling air introducing / discharging apparatus which is located behind a heat exchanger disposed in front of an engine of an automobile and which introduces cooling air into the heat exchanger. In the cooling air introduction and discharge device having a shroud forming an air passage from the heat exchanger to a fan and having an obstacle behind the fan, a wind direction changing plate is provided behind the fan, and the wind direction changing plate is It has a large number of fixed blades in the radial direction, and this fixed blade has a predetermined mounting angle and a deviation angle in the fan rotation direction, but if there is a partial obstruction in the air discharge direction, the This is to eliminate the angle of deviation of the fixed blades that blow air to the obstacle (claim 1).

Thus, when there is a partial obstruction in the exhaust air direction, the displacement angle of the fixed blade is eliminated so that the fixed blade is prevented from hitting and the exhaust efficiency is improved.

The displacement angle of the fixed blade of the wind direction changing plate is not provided near a partial obstacle, but may be gradually provided in a direction away from the obstacle. ).

Further, the cooling air introducing / discharging device according to the present invention is provided with a plurality of fans behind the heat exchanger arranged at the front part of the engine of the automobile, for introducing cooling air to the heat exchanger. In a cooling air introduction / discharge device having a shroud forming an air passage from the heat exchanger to a fan and having an obstacle behind a fan, a plurality of wind direction change plates are provided behind the plurality of fans corresponding thereto, The wind direction change plate has a large number of fixed blades in a radial direction,
Although the fixed blades have a predetermined mounting angle and a deviation angle in the fan rotation direction, the deviation angle of the fixed blades adjacent to each other is eliminated.

[0015] With this arrangement, since there are a plurality of cooling air introduction fans, and there is no displacement angle of the fixed blade near the wind direction changing plate adjacent to each other, the exhaust air collides with the adjacent portion. And the exhaust efficiency can be improved.

The offset angle of the fixed blade of the wind direction changing plate is not provided at the nearest portion near the adjacent side, but may be provided gradually in the direction away from it. 4).

The fan also includes a ring fan provided with a ring on the outer periphery. When a ring fan is used, the fogging rate for the fan is determined by one or both of the ring and the shroud.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, there are shown a sectional view of an engine room 1 of an automobile and a view seen from a wind direction changing plate 13 side. The engine room 1 of the automobile is an air intake 2 having an open front, and a radiator 5 for cooling engine cooling water is further provided behind the air intake 2. Two fans 6 and 6 are provided behind the shroud, and shrouds 10 and 10 are provided between the radiator 5 and the fan 6 to improve the efficiency of the fans 6 and 6. Air passage 1 at 10,10
1 and 11 are formed.

The fan 6 is an axial fan, for example, which is driven to rotate by a motor or the like to generate an air flow in a direction parallel to the rotation axis. Therefore, when the fan 6 is rotated, cooling air is introduced from the air inlet 2, cools the heat exchangers 4, 5, and passes through the air passage 11 to a device such as the engine 7 in the engine room 1. Toward the target obstacle) as shown by the arrow. A wind direction change plate 13 described below is provided behind the fans 6, 6, whereby the discharged wind is changed so that the discharging direction is spread outward, and the discharged wind is smoothly discharged. In addition, the fan 6
A ring fan provided with a ring on the outer periphery may be used. In FIG. 1, reference numeral 12 denotes a battery.

In FIG. 3, a fan 6 is a fan motor 6
The shroud 10 is disposed at the rear end of the shroud 10 by a mounting plate 18 which is fitted to the outside. The wind direction change plates 13 have a boss 20 at the center, and nine fixed blades 21 are provided from the boss 20.
Are formed in the radial direction, and a reinforcing ring 22 is attached to the tip. The fixed blades 21 of the wind direction change plates 13 and 13 have a “deviation angle”. This shift angle is shown in FIG.
With reference to, the rotation coordinates with the rotation center PO as the origin, the reference line of the angle of the straight line passing from the PO to the point P1 of the root portion of the fixed blade 21 (position angle 0 °), and the fan rotation direction as the positive direction When the system is defined, the angle between the straight line passing through the point P2 at the tip of the fixed blade 21 and the reference line is expressed as a shift angle β.

In this example, the fixed blade 2 of the wind direction changing plate 13 is
1 is displaced in the fan rotation direction side from a portion on the inner diameter side which is adjacent over the entire length. The exhaust air movement by the fan is shown by a solid line in FIG. In addition, since FIG. 6 is a diagram viewed from the rotation direction, axial components are not represented. Exhaust air immediately after passing through the fan has a high fogging rate and therefore has a small component in the radial direction, and mainly consists of components in the axial direction and the rotational direction.

Thereafter, the exhaust air colliding with the fixed blade 21 is
It will flow along the fixed blade 21. Here, since the fixed blade 21 is displaced in the fan rotation direction side from the portion on the inner diameter side adjacent thereto, the exhaust air that has collided with the fixed blade is directed in the radially expanding direction along the fixed blade 21. That is, a velocity component in the radial direction is added. In FIG. 5, the solid line shows the movement of air flowing along the fixed blades 21 immediately after the fan, and the two-dot chain line shows the overall flow of exhaust air after being changed by the fixed blades.

Although the fixed blade 21 is more shifted in the rotational direction than the inner diameter portion adjacent to the fixed blade 21 as much as possible over its entire length, a greater effect can be obtained. If it is about 40% or more, the effect is surely obtained, and if it exceeds 70%, a remarkable effect is obtained. As a result of measuring the fan airflow under the same conditions as the other conditions by changing the deviation angle β variously, the airflow becomes maximum when the deviation angle is in the range of 10 degrees to 60 degrees.

The fixed blade 21 has a mounting angle. That is, the mounting angle has an angle γ (shown in FIG. 5) formed by the fixed blades 21 with respect to the fan traveling direction centered on the fan rotation axis. With the point Pt at the end of the fixed blade 21 as the origin, a reference (0 degree) parallel to the fan traveling direction is set, and the forward direction is toward the downstream side of the exhaust air of the fan. The mounting angle γ is preferably in the range of 30 degrees to 70 degrees, and the fan exhaust air collides with the fixed blade and flows smoothly along the fixed blade, so that the exhaust air is surely spread in the radial direction. . As a result of the experiment by the inventors, the air volume becomes maximum in the range of the mounting angle of 30 to 70 degrees.

The influence of the exhaust air from the fan and the entire obstacle such as the engine is shown in FIG. FIG. 10 is a graph in which the inventors arranged a resistor as an obstacle to the fan, which acts as an obstacle to the exhaust of the fan, behind the fan, and changed the distance from the fan to the resistor to investigate the fan air volume. Things. In a conventional fan with a low fogging rate indicated by a two-dot chain line, the influence of the distance of the gap with the resistor is small, but the energy loss due to the turbulence of the air with the outer periphery of the fan is large, so that the total air volume is small.

On the other hand, in the conventional fan having a high fogging rate, as shown by a solid line in FIG. 10, the air flow is large when the distance of the gap is large, but the influence of the distance of the gap is small when the distance of the gap is about 200 mm or less. And the air volume decreases significantly, and at a certain distance, the air volume is lower than that of a conventional fan having a low fog ratio. On the other hand, in the present invention indicated by the solid line, the air volume is large as a whole and the influence of the distance of the gap is small, so that the conventional fan having a low fogging rate is not reversed.

As described above, the paragraph numbers 0020, 0025, 00
Up to 26, the basic configuration and operation of the wind direction changing plate 13 have been described, but a portion according to the present invention will be described with reference to FIGS.

FIG. 6 is an enlarged view of the wind direction change plate 13 on the left side of the wind direction change plate 13 provided at the rear of the fan 6 of the cooling air introduction / discharge device shown in FIGS. A partial obstacle 12 such as a battery is provided on the left side of the wind direction changing plate 13 in the drawing, and the exhausted air from the wind direction changing plate 13 collides with the fixed blade 2 on the obstacle 12 side.
1, a, b, and c have a rotation center PO as an origin, and this PO
Does not have a shift angle with respect to the reference line (position angle 0 degree) of the angle of the straight line passing through the point P1 of the root portion of the fixed blade.

Therefore, the exhaust air is blown by the fixed blades 21
Partial obstacle 1 affected only by the mounting angles of b and c
There is no more air blowing to only 2 and energy loss can be reduced. Therefore, the blowing efficiency can be improved. In FIG. 6, although the fixed blades 21 do not all have the shift angles of A, B, and C, the shift angle of B is set to 0, and the shift angles of A and C are slightly shifted. You may do it.

FIG. 7 is an enlarged view of wind direction change plates 13 and 13 provided behind the fans 6 and 6 of the cooling air introduction / discharge device shown in FIGS. 1 and 2, respectively.
In the adjacent portion of 13, if there is a deviation angle, the exhaust air collides, so the right fixed blade 21 on the adjacent portion, d, e, f, and the left fixed blade 21, j, c,
For the fixed blade 21, the fixed blades 21
The origin is the rotation center PO, and the reference line (position angle 0) of the angle of a straight line passing from this PO to the point of the root portion of the fixed blade
Degree) does not have a deviation angle.

Therefore, the exhaust air is discharged from the fixed blades 21
Only the mounting angles of E, F, G, J, and R are affected, and the collision of adjacent blowers can be avoided or gradual, and energy loss can be reduced. Therefore, the blowing effect can be improved. In FIG. 7, the fixed blades 21 do not have the shift angles of D, E, F, and G, J, and R, but the shift angles of E, H are set to 0, and D, F, and A slight deviation angle may be added to the points (4) and (5).

[0033]

As described above, according to the present invention, since the exhaust air is exhausted in the direction of expanding outward by the air direction changing plate provided at the rear of the fan, the exhaust air passage becomes narrow like a recent automobile. Even if an entire obstacle such as an engine is placed close behind the fan, the benefits of a fan with a high fogging rate can be fully enjoyed, and as a result a large air volume can be obtained. If there is a new partial obstacle in the expanded direction, energy loss can be reduced as much as possible by changing the blowing direction by eliminating the deviation angle of a part of the wind direction changing plate. 1 and 2). In the case where a fan is arranged adjacently and a wind direction changing plate is also arranged adjacently, a part of fixed blades of the wind direction changing plate in the adjacent portion is eliminated so as to eliminate the exhaust angle. It is possible to eliminate energy interference by eliminating interference between comrades, and to improve the blowing efficiency.
And 4).

[Brief description of the drawings]

FIG. 1 is a plan view of an engine room in which a cooling air introduction / discharge device of the present invention is installed.

FIG. 2 is a view as viewed from a wind direction changing plate side of the above.

FIG. 3 is a cross-sectional view in which the wind direction change plate is specifically attached to a shroud.

FIG. 4 is a view showing a part of a wind direction plate and explaining a “deviation angle β” in a fixed blade.

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4A of the fixed blade provided on the wind direction changing plate, and the “mounting angle γ” is described.

FIG. 6 is an explanatory view of a wind direction changing plate in a case where a partial obstacle is present near the wind direction changing plate in the embodiment of the present invention.

FIG. 7 is an enlarged view from the wind direction changing plate side in an embodiment of the present invention, in which two wind direction changing plates are provided, and fixed blades at adjacent portions do not have a shift angle. is there.

FIG. 8 is an example in which the wind direction changing plate of the invention proposed by the applicant is provided, and is an example in which two wind direction changing plates are provided and viewed from the wind direction changing plate side.

FIG. 9 is a plan view of an engine room in which the wind direction changing plate of the invention previously proposed by the applicant is provided.

FIG. 10 is a characteristic diagram illustrating a relationship between a fan, an apparatus such as an engine (a whole obstacle), a distance, and an air volume.

FIG. 11 is a diagram illustrating a fog ratio in a relationship between a rear end of a shroud and a fan.

FIG. 12 shows the relationship between the fogging ratio and the exhaust direction in the relationship between the fan and the shroud.
The case where the fogging rate is low is shown.

FIG. 13 is a diagram illustrating a fogging rate of a shroud with respect to a ring fan.

FIG. 14 is a diagram illustrating a fogging rate of a ring with respect to a blade in a ring fan.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine room 2 Inlet 4 Condenser 5 Radiator 6 Fan 6 'Fan 6b Blade 7 Complete obstacle such as engine 10 Shroud 12 Partial obstacle 13 Wind direction change plate 21 Fixed blade

Claims (5)

[Claims] 1. A fan, which is provided behind a heat exchanger disposed in front of an engine of an automobile and introduces cooling air into the heat exchanger, and forms an air passage from the heat exchanger to the fan. A cooling air introduction / exhaust device having a shroud having a high fogging rate with respect to a fan and having obstacles behind the fan, wherein a wind direction changing plate is provided behind the fan, and the wind direction changing plate has a large number of radial directions. These fixed blades have a predetermined mounting angle and a deviation angle in the fan rotation direction, but if there is a partial obstacle in the air discharge direction, the air blows to the partial obstacle. A cooling air introduction / discharge device characterized in that the angle of displacement of the fixed blades which leads to (1) is eliminated. 2. The fixed blade according to claim 1, wherein the displacement angle of the fixed blade is not provided near a partial obstacle, but is gradually provided in a direction away from the obstacle. Cooling air introduction and discharge device. 3. A plurality of fans for introducing cooling air to the heat exchanger behind a heat exchanger disposed at a front portion of an engine of a vehicle, and an air passage extending from the heat exchanger to the fan. In the cooling air introduction / exhaust device having a shroud to be formed and having a high fogging ratio with respect to the fan of the shroud, and having an obstacle behind the fan, a plurality of wind direction change plates are provided behind the plurality of fans corresponding thereto, The wind direction changing plate has a large number of fixed blades in a radial direction, and the fixed blades have a predetermined mounting angle and a deviation angle in a fan rotation direction, but are characterized by eliminating a deviation angle of the fixed blades adjacent to each other. And cooling air introduction and discharge device. 4. The cooling system according to claim 3, wherein the fixed blade has a displacement angle which is not provided at the closest one in the vicinity of the adjacent side, but has a displacement angle gradually in a direction away from the fixed blade. Air introduction and discharge device. 5. The fan also includes a ring fan provided with a ring on an outer periphery, and when a ring fan is used, a fogging rate for the fan is determined by one or both of the ring and the shroud. 4. The cooling air introduction / discharge device according to 1 or 3.