JPH0988890A - Blade structure of fan for blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To immediately discharge the rain even when it enters a hollow part by providing a water discharge port to the outside of a blade on the hollow part in a fan for a blower in which the hollow parts are respectively formed on a plurality of blade parts. SOLUTION: In a fan 10 for a blower to be used for an outdoor unit of an air conditioner, blades 2a-2d of air-foil structure are provided on the outer circumference of an approximately cylindrical hub 1 with the prescribed pitches and with the prescribed angle of inclination in the blowing direction. The blades 2a-2d consist of an upper blade 21 and a lower blade 22 to be joined with each other, and a hollow part 3 is formed on a part from a forward edge side close to the hub 1 to a rear edge side, and an air introducing port 5 is formed in the centrifugal direction in a side end part of the hub 1. When the fan is rotated, water in the hollow part 3 is surely discharged out of the blades through the water discharge port 4 by the centrifugal force applied thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan structure for a blower fan in which the blade has a hollow portion.

[0002]

2. Description of the Related Art For example, in an axial flow type fan such as a propeller fan, the blade is made thicker as one of means for improving the blowing performance and reducing flow separation and noise at the blade leading edge. It is conceivable to use an air wheel structure.

However, if the wall thickness of the blade portion is increased as it is, the weight of the blade itself is increased, and the required driving force is increased.

Therefore, as a countermeasure against the problem, if the blade portion is formed in a hollow structure, the thickness is substantially increased without increasing the weight, and a lightweight airfoil structure is obtained. Can be realized.

[0005]

However, in order to realize the hollow structure, the wing portion inevitably has the upper wing and the lower wing divided into first parts, and thereafter the hollow part is left to leave the peripheral edges of both parts. It is necessary to bond the parts to each other with an adhesive or the like to integrate them.

However, it is extremely difficult to perform the joining completely, and it is inevitable that a certain gap is partially generated. Further, in the case where they are completely joined together, it is expected that the blades will be deformed by the expansion of the internal air.

Therefore, when the fan is used as, for example, an outdoor unit for an air conditioner, rainwater intrudes into the hollow portion through the above-mentioned gap, which impairs the weight balance between a plurality of blades and causes uneven rotation. Occurs.

The present invention has been made to solve the above problems, and by providing a water discharge port in the hollow portion, it is possible to automatically discharge rainwater by utilizing centrifugal force during rotation, An object of the present invention is to provide a blade structure for a fan for a blower, which eliminates the occurrence of uneven rotation.

[0009]

In order to achieve the above object, the present invention comprises the following means for solving problems.

That is, first, as shown in FIGS. 1 to 3, for example, as shown in FIGS. 1 to 3, the blade structure of the fan for a blower according to the present invention is the fan for a fan 10 having a hollow portion 3 in the blade portions 2a to 2d. 3 is provided with a water discharge port 4 to the outside of the blade.

Further, in the blade structure of the fan for a blower according to the present invention, the water discharge port 4 in the above structure is provided at the end of the blade hollow portion 3 on the centrifugal direction side.

Further, in the blade structure of the fan for a blower according to the present invention, in the above structure, the air inlet port 5 is formed in the blade hollow portion 3 at the hub 1 side.

Further, in the blade structure of the fan for a blower according to the present invention, the blade portions 2a to 2d in the above structure are formed into the air wheel structure by the hollow portion 3.

Further, the blade structure of the fan for the blower according to the present invention has blade portions 2a to 2 having the hollow portion 3 in each of the above configurations.
d is formed by air assist molding.

Further, in the blade structure of the fan for a blower according to the present invention, the blade portions 2a to 2d in the above-mentioned structure are divided into the upper blade 21 and the lower blade 22, and the hollow portion 3 is left, It is formed by ultrasonically joining the peripheral portions 21a and 22a.

In the blade structure of the fan for a blower according to the present invention, the blade portions 2a to 2d and the hub 1 in the above structure are integrated by ultrasonic bonding.

Further, in the blade structure of the fan for a blower according to the present invention, the fan 10 having the above structure is formed by a propeller fan.

[0018]

The present invention has the following actions in correspondence with the above-mentioned configuration.

That is, first, in the blower fan blade structure that is the basis of the present invention, in the blower fan 10 having the hollow portions 3 in the blade portions 2a to 2d, the water discharge port to the outside of the blade is provided in the blade hollow portion 3. 4 is provided.

Therefore, when the fan 10 is rotated,
The water in the blade hollow portion 3 is, due to the centrifugal force acting at that time,
The water is surely discharged to the outside of the blade via the water discharge port 4.

As a result, the imbalance of the inter-blade weight of the plurality of blades does not occur, and the uneven rotation of the fan 10 is prevented.

Further, in the blade structure of the fan for a blower according to the present invention, the water discharge port 4 in the above structure is provided at the end of the blade hollow portion 3 on the centrifugal direction side.

Therefore, the centrifugal force acts effectively, and the water discharging action through the water discharging port 4 when the fan 10 rotates becomes more effective.

Further, in the blade structure of the fan for the blower according to the present invention, in the above structure, the hub 1 is provided in the blade hollow portion 3.
The air introduction port 5 is formed on the side.

Therefore, when the fan 10 is rotated, air is effectively introduced from the air introduction port 5 and is discharged through the water discharge port 4, so that the centrifugal force acts. Since no negative pressure is generated when the water is discharged from the water discharge port 4, the discharging action at the time of discharging the water becomes smoother.

Further, in the fan structure for the blower fan according to the present invention, the blade parts 2a to 2d in the above structure are bulged by the hollow part 3 to form a thick air wheel structure.

Therefore, it is possible to realize a wing structure with high air blowing performance and low noise by preventing separation of the air flow at the blade leading edge portion without increasing the blade weight.

Further, in the blade structure of the fan for a blower according to the present invention, the blade portions 2a to 2a having the hollow portion 3 in each of the above-mentioned constitutions.
2d is formed by air assist molding.

Therefore, according to this structure, it is possible to realize a lightweight blade structure having a hollow portion with a relatively small gap, and in combination with the good water discharge performance, the air blowing performance is high and the noise is low. It is possible to provide a high-performance fan that has low rotation and has no uneven rotation.

Further, in the blade structure of the fan for a blower according to the present invention, the blade portions 2a to 2d in the above-mentioned structure are divided into the upper blade 21 and the lower blade 22, and the hollow portion 3 is left. It is formed by ultrasonically joining the peripheral portions 21a and 22a.

In this structure, the upper blade 21 and the lower blade 22 can be formed as thin as possible as compared with the case of the air-assisted molding method, so that the weight can be further reduced. In addition, the mold structure such as a mold is made into a two-dimensional structure, which simplifies the structure and reduces the cost.

Further, in the blade structure of the fan for a blower according to the present invention, the blade portions 2a to 2d and the hub 1 in the above respective configurations are integrated by ultrasonic bonding.

According to this structure, the hub 1 and the wings 2a ...
Both 2d can be molded with a mold such as a mold having a two-dimensional structure, and the cost can be further reduced.

Further, in the blade structure of the fan for a blower according to the present invention, the fan 10 having the above structure is formed by a propeller fan.

Therefore, in the blade structure of the same propeller fan, it is possible to realize each of the above operations.

[0036]

As a result of the above, according to the blade structure of the fan for a blower of the present invention, rainwater or the like enters the hollow part when the fan for a fan having a hollow blade structure is applied to an outdoor unit for an air conditioner. Even if it occurs, it can be immediately discharged, and it does not cause imbalance in the weight between the blades, so it is possible to reduce the weight of the blades as much as possible and to make it an air foil, but also to stabilize the fan. It becomes possible to secure the rotating performance. Therefore, it becomes possible to provide a high-performance blower fan suitable for an outdoor unit for an air conditioner.

[0037]

1 to 3 show the blade structure of a fan for a blower according to Embodiment 1 of the present invention.

First, FIG. 1 shows a front view of the fan 10 for the blower in a disassembled state of the blades. In the figure, reference numeral 1 is a substantially cylindrical hub, and a plurality of (four) blades 2a to 2 having an air wheel structure as shown in FIGS. 2 and 3 are provided on the outer periphery of the hub 1.
d are provided at a predetermined pitch with a predetermined inclination angle in the blowing direction.

As shown in FIGS. 1 and 3, the blades 2a to 2d of the fan 10 are constituted by joining an upper blade 21 and a lower blade 22 from the front edge side near the hub 1 to the rear edge side. A hollow portion 3 having the cross-sectional structure shown in FIG. 2 is formed in the extending portion, and the hollow portion 3 forms a thick portion of the air-foil structure shown in the drawing.

At the end of the hollow portion 3 on the centrifugal direction side, a water discharge port 4 is formed in the centrifugal direction, while at the end of the hub 1 side, an air inlet port 5 is directed in the centrifugal direction. Is formed.

The blade structure of the fan for the blower according to the present embodiment has the following actions and effects corresponding to the above configuration.

That is, in the fan structure for the blower fan, in the fan fan 10 having the hollow portions 3 in the blades 2a to 2d as described above, the centrifugal direction is directed to the end of the hollow portion 3 on the centrifugal direction side. The water discharge port 4 to the outside of the blade is provided.

Therefore, when the fan 10 is rotated,
As shown in FIG. 2, the water in the blade hollow portion 3 is reliably discharged to the outside of the blade via the water discharge port 4 by the centrifugal force acting at that time.

As a result, the imbalance of the inter-blade weight does not occur, and the uneven rotation of the fan 10 is prevented.

In this case, in particular, since the water discharge port 4 is located at the end of the hollow portion 3 of the blade in the centrifugal direction and is provided in the centrifugal direction, the centrifugal force acts effectively, The water discharging action through the water discharging port 4 when the fan 10 rotates becomes smoother.

In addition, in the blade structure of the fan for the blower, in the above structure, the air introduction port 5 is further formed on the hub 1 side of the blade hollow portion 3.

Therefore, when the fan 10 is rotated, air is effectively introduced from the air introduction port 5, and the air is discharged together with water through the water discharge port 4, so that centrifugal force is exerted. As a result, a negative pressure is not generated when the water is discharged from the water discharge port 4, so that the discharging action at the time of discharging the water becomes even smoother.

In the blade structure of the fan for the blower, each of the blades 2a to 2d is bulged and thickened by the hollow portion 3 to form a lightweight air wheel structure.

Therefore, it is possible to realize a wing structure with less noise by preventing separation of the airflow at the front edge portions of the blades 2a to 2d without increasing the blade weight.

As a result, according to the blade structure of the fan for the blower in accordance with the present embodiment, in the case where the blower fan 10 having the hollow blade structure is applied to the outdoor unit for the air conditioner, the hollow portion 3 is formed. Even if rainwater or the like intrudes on the blades, it can be immediately discharged, and it does not cause an imbalance in the weight between the blades. Although possible, stable rotation performance of the fan 10 can be secured and high air blowing performance can be obtained.

By the way, the upper blade 21 and the lower blade 22 of the blades 2a to 2d and the connecting portion between the blades 2a to 2d and the hub 1 are formed, for example, as follows.

That is, first, as shown in FIGS. 1 and 3, the blades 2a to 2d are formed in a thin plate shape having an inverted concave surface capable of forming the hollow portion 3 as shown in FIG. 2 in the joined state. The upper wing 21 and the lower wing 22 are opposed to each other, and the rib fitting holes 7, 7 ... And the cylindrical ribs 8, 8. It is integrally formed by sonic fusion bonding and joining.

Then, the base portions 9a of the blades 2a to 2d having the above structure.
9d (the upper wing 21 and the lower wing 22 are shown separately in FIG. 1, the reference numerals 9a to 9d are shown on the lower wing 22 side), as shown in FIG. The fan 10 in which the blades 2a to 2d are joined and integrated is formed by fitting and abutting on the peripheral surface of the hub 1 and ultrasonically fusing and fitting the fitting and abutting surface portion.

According to such a split molding and ultrasonic bonding structure, for example, like the conventional high performance fan shown in FIG.
Since a complicated molding die having a three-dimensional structure as in the case where the overlapping portions 6a to 6d having a high skew are formed to be integrated with each other is not required, both can be molded by the two-dimensional mold. It will be low cost. Further, the thickness portion is reduced and the weight is reduced.

The blades 2a to 2d having the hollow portion 3 are
The blade itself may be formed by, for example, an air-assisted method at the time of molding a synthetic resin. In that case, there is a degree of freedom in the shape of the hollow portion 3 of the blade and a surface that is slightly insufficient for thinning the blade portion. However, gaps are relatively unlikely to occur.

[Brief description of drawings]

FIG. 1 is a front view in a disassembled state of blades showing a structure of blades of a fan for a blower according to an embodiment of the present invention.

FIG. 2 is a side view of the wing portion.

FIG. 3 is a cross-sectional view showing a configuration of the wing portion.

FIG. 4 is a front view showing the structure of a conventional high-performance fan.

[Explanation of symbols]

Reference numeral 1 is a hub, 2a to 2d are blades, 3 is a hollow portion, 4 is a water outlet, and 5 is an air inlet.

Claims (8)

[Claims] 1. Hollow portions (3) in the wings (2a) to (2d).
In the fan fan (10) having the above, a blade structure for a fan fan, characterized in that the blade hollow part (3) is provided with a water discharge port (4) to the outside of the blade. 2. The blade structure for a fan for a blower according to claim 1, wherein the water discharge port (4) is provided at an end portion of the blade hollow portion (3) in the centrifugal direction. 3. A fan for a blower according to claim 1, wherein an air introduction port (5) is formed in the hollow portion (3) of the blade at the side of the hub (1). Wing structure. 4. The wing structure for a fan for a blower according to claim 1, wherein the wing parts (2a) to (2d) are formed into an airfoil structure by a hollow part (3). 5. The blade portions (2a) to (2d) are peripheral portions (21a) of the upper blade (21) and the lower blade (22), which are formed by being divided from each other, leaving a hollow portion (3). , (22a) are ultrasonically joined to each other, and the blade structure of the fan for a fan according to claim 1, 2, 3 or 4. 6. A wing portion (2a) having a hollow portion (3)
The blade structure for a fan for a blower according to claim 1, 2, 3 or 4, wherein (2d) is formed by air assist molding. 7. The wing parts (2a) to (2d) and the hub (1) are integrated by ultrasonic bonding, as claimed in claim 1, 2, 3, 4, 5 or 6. Wing structure of the fan for the fan. 8. The blade structure of a fan for a blower according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the fan (10) is a propeller fan.