JPH06346886A - Fan, and outdoor unit for air conditioner - Google Patents

Abstract

PURPOSE:To provide a fan with desirably manufacturable property while being provided with high vibration proof performance with a small number of part items, without generating vibration even with unbalance, and an outdoor unit for an air conditioner with a blower fitted with this fan disposed therein. CONSTITUTION:A fan 10 is formed of a boss part 11 into which the rotary shaft 13 of a driving motor 12 is fitted, a hub body 15 formed into cylindrical shape and provided integrally with fan blades 24, and metal plate springs 17A, 17B for connecting the hub body 15 to the boss part 11. This fan 10 is disposed as an blower at an outdoor unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propeller type fan and an outdoor unit of an air conditioner in which a blower equipped with this fan is arranged.

[0002]

2. Description of the Related Art A fan provided in an outdoor unit of an air conditioner has a form called a propeller fan, and is composed of a cylindrical fan hub and a fan blade formed on the outer peripheral surface of the fan hub.

In particular, in the fan hub, there are various forms in order to improve the vibration damping efficiency, and the fan hub is used depending on each condition. For example, JP-A-58-7
No. 9095 proposes a boss portion, which will be described later, in the fan hub in order to directly attach such a propeller fan to the drive motor.

That is, as shown in FIG. 8, in a propeller fan, a fan hub 1 and a fan blade 2 are integrally formed of a resin material. At the center position of the fan hub 1, a boss portion 4 that is directly attached to the rotating shaft 3 of a drive motor (not shown) is provided.

The boss portion 4 is composed of a shaft side metal boss 5 fitted with the rotating shaft 3, a rubber boss 6 and a boss side metal boss 7. The rubber boss 6 absorbs rotationally excited vibration generated by torque unevenness in the rotation direction of the rotating shaft 3, and prevents torsional vibration of the fan blade 2 and the entire propeller fan and noise generated due to this vibration.

Further, the boss side metal boss 7 forms a heat insulating layer for preventing the rubber boss 6 from being deformed by the high temperature resin material forming the fan hub 1 when the boss portion 4 is cast into the fan hub 1. Between the boss portion 4 on the back surface of the fan hub 1 and the outer peripheral surface, in order to improve the strength of the fan hub 1,
A plurality of ribs 8 are formed.

[0007]

However, the fan employing such a vibration isolation structure has the following problems. That is, when the fan is unbalanced, displacement occurs in the radial direction and the axial direction, which leads to the generation of new vibration different from the rotationally excited vibration.

Since the boss 4 and the fan hub 1 are completely separate components, it is difficult to align the axial centers during molding, and high precision is required for assembly. Since the boss portion 4 is made of a metal material, a rubber material, and a metal material, the number of parts increases, the manufacturing cost increases, and the molding time increases.

The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent vibration even if there is an imbalance and to achieve high vibration isolation with a small number of parts. It is an object of the present invention to provide an outdoor unit of an air conditioner which has a performance and is easy to manufacture and a fan in which the fan is assembled are arranged to reduce operating noise.

[0010]

[Means for Solving the Problems] In order to meet the above purpose,
A fan according to a first aspect of the present invention is a hub formed in a cylindrical shape in which a boss portion having a shaft hole into which a rotation shaft of a drive motor is fitted is provided along an axis thereof, and a fan blade is integrally provided on an outer peripheral surface thereof. It is characterized by comprising a main body and a metallic leaf spring that connects the inner peripheral surface of the hub main body and the outer peripheral surface of the boss portion.

In order to meet the above object, the fan of the second invention has a boss portion having a shaft hole into which the rotation shaft of the drive motor is fitted along the shaft center thereof, and a fan blade integrally provided on the outer peripheral surface thereof. A hub body formed in a cylindrical shape,
It is characterized by comprising a leaf spring connecting the inner peripheral surface of the hub body and the outer peripheral surface of the boss portion, and the boss portion, the hub body and the leaf spring are all integrally molded by resin molding.

In order to meet the above object, an outdoor unit for an air conditioner according to a third aspect of the present invention has a boss portion, a hub body integrally formed with a fan blade and formed into a cylindrical shape, the hub body and the boss portion. A fan composed of a metal leaf spring for connecting to and is fitted to the rotary shaft of the drive motor to form a blower, and the blower is arranged in the unit body.

[0013]

According to such a structure, as the drive motor rotates, in the fan, the leaf spring that connects the hub body and the boss portion to the rotation-induced vibration in the radial direction, the axial direction, and the rotation direction. Absorbs efficiently.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIGS.
Is a propeller fan, and a boss portion 11 made of a synthetic resin material is provided along the axis of the propeller fan. The boss portion 11 has a shaft hole 14 through which the rotary shaft 13 of the drive motor 12 is inserted.

Further, a cylindrical hub body 15 is provided so as to surround the boss portion 11 and to align the upper end portion thereof, and is approximately twice as long in the axial direction. The hub main body 15 is made of a synthetic resin material, and a plurality of fan blades 24 are integrally provided on the outer peripheral surface thereof. Collar 16
... are integrally formed by protrusion. These flange portions 16 are provided so as to project from the upper end side of the hub body 15 to the substantially central portion, and those projecting from the lower end side of the hub body 15 to the substantially central portion. The other collar portion 1 is provided between the collar portions 16.
6 intervenes.

Further, the upper end and the lower end of the boss portion 11 in the drawing are respectively embedded with the inner end portions of the upper leaf spring 17A and the lower leaf spring 17B which are leaf springs. The upper and lower leaf springs 17A and 17B project toward the hub body 15, and the outer diameter side end portions thereof are embedded in the hub body 15 to connect the boss portion 11 and the hub body 15.

The upper and lower leaf springs 17A and 17B are shown in FIG.
As shown in (A) and (B), they have the same shape. This is composed of an inner peripheral portion 18, an outer peripheral ring portion 19 forming a concentric circle, and a plurality of bent portions 20 connecting the inner peripheral portion and the outer peripheral ring portion.

The inner peripheral portion 18 is provided with a shaft hole 21 through which the rotary shaft 13 is inserted, and a plurality of small holes 22 ... Surrounding the shaft hole at predetermined intervals. These small holes 22 ...
Is used for filling and positioning in which the resin material is filled when the leaf springs 17A, 17B are cast into the boss portion 11.

Four convex portions 18a are integrally provided on the outer peripheral edge of the inner peripheral portion 18 at predetermined intervals, and the bent portions 20 are connected to the tips of the respective convex portions. Set up.

Each of the bent portions 20 is integrally U-shaped with both ends thereof integrally connected to the tip of the convex portion 18a and the outer peripheral ring portion 19, and is bent. The outer peripheral ring portion 19 is integrally formed with a convex portion 19b on the inner peripheral side of the ring body 19a, and the bent portion 20 is continuously provided here.

A plurality of small holes 23 are formed in the outer peripheral ring portion 19.
Are provided, and these small holes are used for filling and positioning in which the resin material is filled when the hub body 15 is cast.

The upper leaf spring 17A and the lower leaf spring 17B have the same shape and structure as described above.
As shown in FIG. 2, the respective parts are positioned with a predetermined angle offset, as shown in a plan view (particularly in FIG. 2).

To explain further, the positioning is set so that the protrusions 18a and 19b protruding from the lower leaf spring 17B are located between the protrusions 18a and 19b protruding from the upper leaf spring 17A.

As shown in FIG. 1 again, the propeller fan 10 thus constructed is attached to the rotary shaft 13 of the drive motor 12 to form a blower 25. That is, the rotary shaft 13 is inserted into the shaft hole 14 provided in the boss portion 11 of the fan 10, and the tip screw portion 13 a of the rotary shaft 13 is inserted into the boss portion 1.
Project from 1. A fixing nut 26 is fastened to the screw portion 13a to fix the fan 10.

Then, as shown in FIG. 7, the blower 25 equipped with the above-described fan 10 is arranged in the outdoor unit of the air conditioner. In addition, in the drawing, 27 is a bottom plate that constitutes a unit main body 28, and the blower 25 is at this predetermined position, a heat exchanger 29 formed in an L shape in plan view, and a refrigeration cycle component 30. Are placed. After such an arrangement, an outdoor unit is formed by attaching a plate body in which the front plate 32 having the fan guard 31 and the upper plate 33 are integrated.

As the drive motor 12 is driven, the rotary shaft 13 rotationally drives the fan 10. When the torque unevenness from the rotary shaft 13 is actually transmitted to the boss portion 11, the force tries to be transmitted to the hub body 15 via the upper leaf spring 17A and the lower leaf spring 17B, and further to the fan blades 24.

However, each leaf spring 17A, 17B has
A plurality of bent portions 20 in which the plate thickness direction and the axial direction are combined ...
Since this is provided, this portion has a flexible spring property with respect to the rotation direction and a relatively hard spring property in the axial direction and the radial direction.

Therefore, when the propeller fan 10 is rotated, since the upper and lower leaf springs 17A and 17B are flexible with respect to the rotation direction, even if rotationally excited vibration occurs due to torque unevenness, each leaf spring causes this vibration. Most of the noise can be absorbed, and there is no transmission to the hub body 15 or the fan blades 24, and it is possible to prevent the generation of noise due to the torsional vibration of the fan.

Further, in the radial direction and the axial direction, since the strength is the same as that of the conventional one, even if the fan 10 is unbalanced, the displacement with respect to the rotating shaft 13 does not occur, and the rotation induced vibration is generated. Does not generate different new vibrations.

On the other hand, when a force other than the normal operation, that is, a rotation torque for screwing or a drop occurs, each leaf spring 17
The largest stress is generated in the bent portions 20 of A and 17B, but the allowable stress can be made large due to the material and shape of the structure, and the risk of damage is extremely small.

Since it is the blower 25 that obtains the above-mentioned effects, when it is arranged in the outdoor unit of the air conditioner,
Contributes to the reduction of operating noise. Although the upper and lower leaf springs 17A and 17B are formed of metal plates in the above embodiment, the present invention is not limited to this. The upper and lower leaf springs 17A and 17B may be formed of the same synthetic resin material as the boss portion 11 and the hub body 15. Good.

In this case, only the material of the leaf spring is changed, and the shape structure is the same as that of the fan described above with reference to the drawings. Therefore, the drawing is applied and the provision of new drawings is omitted. .

Therefore, integral molding such as injection molding is possible, high precision is not required for assembly, and cost reduction is achieved by reducing the number of parts.
The shortening of molding time becomes remarkable.

[0034]

As described above, in the fan according to the first invention, the outer peripheral surface of the boss portion and the inner peripheral surface of the hub body integrally provided with the fan blade are connected by the metal leaf spring. Even if there is an imbalance, there is an effect that vibration is not generated, and high vibration damping performance is provided with a small number of parts.

In the fan according to the second aspect of the present invention, a boss portion into which the rotary shaft of the drive motor is fitted, a cylindrical hub body integrally provided with a fan blade, a hub body and the boss portion. Since the leaf springs that connect the components are all integrally molded by resin molding, vibration is not generated even if there is an imbalance, high vibration isolation performance is achieved with a small number of parts, and manufacturability is improved. There is an effect that can be achieved.

According to the outdoor unit of the air conditioner of the third invention, the boss portion into which the rotary shaft of the drive motor is fitted, the cylindrical hub body integrally provided with the fan blade, and the metallic hub connecting them. Since a fan equipped with a fan consisting of leaf springs is arranged, even if there is an imbalance, it does not generate vibration, and with a small number of parts, it is a fan with high vibration isolation performance that reduces operating noise. There is an effect that can be achieved.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a blower that is a drive motor to which a fan is attached, showing an embodiment of the present invention.

FIG. 2 is a front view of the embodiment, in which a fan blade of a fan is omitted.

FIG. 3 is a vertical cross-sectional view of the same embodiment in which a fan blade of a fan is omitted.

FIG. 4 is a longitudinal sectional view of the same embodiment taken along the line 2a-a.

FIG. 5 is a longitudinal sectional view of the same embodiment taken along the line 2b-b.

FIG. 6A is a front view of the leaf spring of the embodiment.
(B) is a side view of the leaf spring of the embodiment.

FIG. 7 is a partially exploded perspective view of the outdoor unit of the air conditioner of the embodiment.

FIG. 8 is a vertical cross-sectional view of a conventional example in which a fan is partially omitted.

[Explanation of symbols]

12 ... Drive motor, 13 ... Rotating shaft, 11 ... Boss part, 24
... fan blades, 15 ... hub body, 17A ... upper leaf spring, 17B ... lower leaf spring, 10 ... fan, 25 ... blower.

Claims (3)

[Claims] 1. A boss portion having a shaft hole into which a rotation shaft of a drive motor is fitted along the axis thereof, and a hub body formed in a cylindrical shape in which a fan blade is integrally provided on an outer peripheral surface thereof. A fan comprising a metallic leaf spring connecting an inner peripheral surface of the hub body and an outer peripheral surface of the boss portion. 2. A boss portion having a shaft hole into which a rotary shaft of a drive motor is fitted along the axis thereof, and a hub body formed in a cylindrical shape integrally provided with a fan blade on an outer peripheral surface thereof. A fan comprising a leaf spring that connects the inner peripheral surface of the hub body and the outer peripheral surface of the boss portion, and the boss portion, the hub body, and the leaf spring are all integrally molded by resin molding. 3. A drive motor comprising: a boss portion, a hub body integrally formed with a fan blade and formed into a cylindrical shape; and a metal leaf spring connecting the hub body and the boss portion. An outdoor unit for an air conditioner, characterized in that the blower is configured by being fitted to the rotary shaft of the blower, and the blower is arranged in the unit body.