JP2003161299A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep blowing efficiency high regardless of an increase and decrease in blowing quantity. <P>SOLUTION: A stationary blade 132 is provided on the back flow side of the rotary blade 11 of an axial fan, and a movable flap 134 is rotatably connected to the rear end side of the stationary blade 132. When the stationary blade 132 and the movable flap 134 are regarded as one blade, the stopper 133e of the stationary blade 132 and movable flap 134 is adjusted so as to maximize the angle of attack α in a low-speed state of the one blade. Accordingly, since the movably flap 134 is rotated as a weathercock so as to minimize air pressure acting on the movable flap 134, on air flow can be efficiently shaped in the low-speed state, and air resistance can be minimized in a high- speed state. The blowing efficiency can be thus kept high regardless of an increase and decrease in blowing quantity. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial fan (JI
S B 0132 (see No. 1012), which relates to a blower in which a stationary blade that rectifies a swirling component of air blown out from an axial fan is provided on the downstream side, and is applied to a blower that blows cooling air to a vehicle radiator. It is valid.

[0002]

2. Description of the Related Art As is well known, an axial flow fan rotates a plurality of radially extending rotor blades to allow air to pass through in the axial direction.
The air flowing in the axial direction contains not only the axial component but also the component in the rotational direction of the axial fan. Is known to improve.

Therefore, in a blower that blows cooling air to a vehicle radiator, the cross-sectional shape of a mounting stay of a motor that drives an axial fan is made to have a blade shape to achieve a rectifying effect to improve the blowing efficiency. There is.

However, the angle of attack of a mounting stay having an airfoil cross section is usually optimum in a state where the vehicle speed is approximately 0 km / h and the amount of cooling air supplied to the radiator is only the amount of air blown by the blower. Therefore, when the cooling air flow increases during high-speed traveling, the mounting stay having this airfoil cross section becomes an air resistance, and the cooling air flow supplied to the radiator does not rise according to the speed. On the contrary, there is a risk that the efficiency of blowing air to the radiator will decrease.

In view of the above points, the present invention has an object to maintain a high blowing efficiency regardless of the increase or decrease of the blowing amount.

[0006]

In order to achieve the above-mentioned object, the present invention has a plurality of rotor blades (111) extending in the radial direction and rotates by rotating in accordance with the invention described in claim 1. Axial fan (110) through which air passes axially
And a drive source (12) for rotating the axial fan (110).
0) and a plurality of units provided on the downstream side of the axial fan (110) and having a predetermined angle of attack with respect to the air flow blown out from the axial fan (110) and stationary with respect to the drive source (120). A stationary flap (132), and at least one of a leading edge side and a trailing edge side of the stationary blade (132) is provided with a movable flap (134) whose angle of attack changes according to an air flow. Is characterized by.

As a result, the wind pressure acting on the movable flap (134) is minimized, that is, the axial fan (1
10) Since the movable flap (134) can be operated so as to follow the air flow on the wake side, it is possible to maintain the high blowing efficiency regardless of the increase or decrease of the blowing amount.

According to the second aspect of the invention, the movable flap (134) is rotatably provided on the trailing edge side of the stationary blade (132) via the hinge portion (133), and acts on the movable flap (134). The movable flap (1
34) is configured to rotate about the hinge portion (133), the movable flap (134) automatically rotates like a weathercock, so that the ventilation efficiency is automatically increased regardless of the increase or decrease of the air flow rate. Can be kept high.

In the invention described in claim 3, the stationary blade (13
The angle of attack of 2) is characterized in that the loss that occurs when the air volume is less than or equal to a predetermined amount is smaller than the loss that occurs when the air volume exceeds the predetermined amount.

As a result, it is possible to suppress the increase in air resistance when the air volume is large while increasing the air blowing efficiency when the air volume is small. Therefore, it is possible to reliably maintain the high air efficiency regardless of the increase or decrease of the air volume. be able to.

According to the fourth aspect of the present invention, the stopper means (133e) for restricting the rotation of the movable flap (134) so that the angle of attack of the movable flap (134) becomes equal to or more than the predetermined angle when the air volume is less than the predetermined amount. ) Is provided.

As a result, when the air volume is small, the swirling component of the air flow on the downstream side of the axial fan (110) can be efficiently rectified, so that the air volume can be reliably increased and the air volume can be increased. It is possible to suppress an increase in air resistance when the number increases.

Incidentally, the reference numerals in the parentheses of the above-mentioned means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In this embodiment, the blower according to the present invention is applied to a blower for blowing cooling air to a vehicle radiator, and FIG. 1 is a blower 100 according to the present embodiment.
It is the schematic diagram which looked at from the wake side.

The blower 100 comprises an axial fan 110, an electric motor 120 that rotationally drives the axial fan 110, a shroud 130, and the like.

Here, the axial fan 110 is a fan having a plurality of rotary blades 111 extending in the radial direction, and through which air passes through in the axial direction, the shroud 1
The reference numeral 30 supports the electric motor 120 and the axial fan 110, covers the gap between the radiator (not shown) and the axial fan 110, and the airflow induced by the axial fan 110 bypasses the radiator. It is a resin molded product that prevents it from flowing.

In this embodiment, the axial fan 110 is used.
Is arranged on the downstream side of the radiator in the air flow, and the electric motor 120 and the axial fan 110 are connected to the shroud 1.
It is fixed to the radiator via 30.

Further, the shroud 130 is integrally formed with a plurality of mounting stays 131 which are located on the downstream side of the axial fan 110 and to which the electric motor 120 is mounted. The mounting stays 131 are shown in FIG. As shown, the cross-sectional shape is formed into a wing shape.

Specifically, the electric motor 1 has a predetermined angle of attack with respect to the air flow blown from the axial fan 110.
20, a stationary wing 132 stationary relative to 20, and a hinge 133
The mounting stay 131 is configured by a movable flap 134 that is rotatably connected to the trailing edge side of the stationary blade 132 via the electric motor 12 mainly by the stationary blade 132.
While supporting 0, the air blown out from the axial fan 110 together with the movable flap 133 is rectified.

As is well known, the angle of attack of the blade means the angle formed by the chord connecting the leading edge and the trailing edge of the blade and the air flowing toward the blade.

Here, as shown in FIG. 3, the hinge portion 133 is provided with a shaft portion 133a having a circular cross section at the trailing edge of the stationary blade 132, and on the outer peripheral surface of the shaft portion 133a at the front end side of the movable flap 134. Groove 133 that slides against
b and the arc-shaped protrusion 133c are provided, the shaft 13
By fitting 3a between the groove 133b and the arcuate protrusion 133c, the movable flap 134 is fixed to the stationary blade 132.
It is designed to be movable with respect to.

The shaft portion 133a of the stationary blade 132 is
A guide hole 133d into which the arcuate projection 133c is slidably inserted is formed on the side.

The vehicle speed of the hinge 133 is approximately 0 k.
In the state where the air flow rate of the cooling air supplied to the radiator is only about m / h, and the air flow rate of the cooling air supplied to the radiator is only the air flow rate by the axial flow fan 110, that is, the air flow rate to the radiator is a predetermined amount V or less, Collision and movable flap 13
Movable flap 1 so that the angle of attack of 4 becomes a predetermined angle or more
A stopper 133e for restricting the rotation of 34 is integrally formed with the movable flap 134.

In the present embodiment, the angle of attack of the stationary blades 132 is greater than the loss that occurs when the air volume is less than the predetermined amount V, compared to the loss that occurs when the air volume exceeds the predetermined amount V. The air flow is set so as to be small, that is, in a state in which the amount of cooling air supplied to the radiator is only the amount of air blown by the axial fan 110.

Further, when the stopper 133e collides with the stationary blade 132 and the rotation of the movable flap 134 is restricted, that is, the amount of cooling air supplied to the radiator is only the amount of air blown by the axial fan 110. In this state, when the stationary blade 132 and the movable flap 134 are regarded as one blade, the angle of attack of the blade regarded as one blade, that is, the front end of the stationary blade 132 and the movable flap 124.
The stopper 133e is set so that the angle formed by the line connecting the rear end and the air flow is optimum.

Next, the characteristic operation of this embodiment and its effect will be described.

FIG. 4 is an explanatory view showing the operation of the movable flap 134. The vehicle speed is slowed down to about 0 km / h, and the cooling air supplied to the radiator is at a low speed only by the air flow by the axial fan 110. In the state, the axial fan 110
The swirling component of the air flow on the wake side of the axial fan 110 becomes large, and the air flow on the wake side of the axial fan 110 is largely inclined with respect to the fan axis.

On the other hand, in a high speed state in which the vehicle speed is high and a large amount of traveling air flows into the radiator, the swirling component in the air flow on the wake side of the axial fan 110 is smaller than that in the low speed state, so that the axial fan 110. The air flow on the wake side gradually becomes parallel to the fan axis as the vehicle speed increases.

At this time, since the movable flap 134 is rotatable around the hinge portion 133, the movable flap 134 has a wind pressure acting on the movable flap 134 like a weathercock within the range regulated by the stopper 133e. Is minimized, that is, the axial fan 110
It automatically rotates along the air flow on the wake side.

The angle of attack of the stationary blades 132 is set so that the air flow is optimum in the low speed state.
In addition, when the stopper 133e collides with the stationary blade 132 and the rotation of the movable flap 134 is restricted, that is, in the low speed state, the stationary blade 132 and the movable flap 134 are set to 1
Since the stopper 133e is set so that the angle of attack α (> 0) of the blade regarded as one piece is optimum when it is regarded as one piece of blade, the efficiency of blowing air to the radiator should be increased. You can

On the other hand, in the high speed state, the attack angle α of the blade regarded as one becomes negative and the stationary blade 132 resists the air flow, but the movable flap 134 acts on the movable flap 134. Since the air pressure rotates so that the wind pressure is minimized, the air resistance in the high speed state can be reduced as compared with the case where the movable flap 134 is fixed in the low speed position.

Since a sufficient amount of cooling air can be obtained in the high speed state, the air resistance of the stationary blades 132 in the high speed state has no practical problem.

Therefore, the blower 10 according to the present embodiment
At 0, the ventilation efficiency can be maintained high regardless of the increase or decrease in the ventilation amount, so that the radiator can be maintained at a high cooling capacity.

(Other Embodiments) In the above-described embodiment, the movable flap 134 is automatically rotated by receiving the wind pressure, but the present invention is not limited to this, and the flap of an aircraft is not limited thereto. As described above, the movable flap 134 may be actively operated by the actuator.

Further, in the above embodiment, the stationary blade 132
Although the movable flap 134 is provided on the trailing edge side, the present invention is not limited to this, and the movable flap 134 may be provided on the leading edge side of the stationary blade 132.

[Brief description of drawings]

FIG. 1 is a front view of a blower according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view showing a structure of a hinge portion according to the embodiment of the present invention.

FIG. 4 is an operation explanatory view of the movable flap according to the embodiment of the present invention.

[Explanation of symbols]

111 ... Rotary blades, 132 ... Stationary blades, 133 ... Hinges,
134 ... Movable flap.

Claims (4)

[Claims] 1. A plurality of rotor blades (11) extending in a radial direction.
1), an axial fan (110) having air passing through in the axial direction when rotated, and a drive source (12) for rotating the axial fan (110).
0) and a downstream side of the axial fan (110) having a predetermined angle of attack with respect to the air flow blown from the axial fan (110) and the drive source (120). A plurality of stationary vanes (132), and at least one of a leading edge side and a trailing edge side of the stationary vanes (132) is provided with a movable flap (134) whose attack angle changes according to an air flow. A blower characterized by being provided. 2. The wind pressure acting on the movable flap (134), the movable flap (134) being rotatably provided on the trailing edge side of the stationary blade (132) via a hinge portion (133). In response, the hinge portion (13
The blower according to claim 1, which rotates about 3). 3. The angle of attack of the stationary blade (132) is set so that the loss generated when the air volume is less than or equal to a predetermined volume is smaller than the loss generated when the air volume exceeds the predetermined volume. The blower according to claim 1 or 2, which is provided. 4. A stopper means (133e) is provided for restricting rotation of the movable flap (134) so that the angle of attack of the movable flap (134) becomes a predetermined angle or more when the air volume is less than a predetermined amount. The blower according to any one of claims 1 to 3, wherein the blower is provided.