JPH05149291A - Air blower device - Google Patents

Abstract

PURPOSE:To provide an air blower device of which the number of parts can be reduced and the weight can be lightened. CONSTITUTION:A shaft 4 additionally used for a motor shaft fixed to the end plate of blower blade 3 is inserted into the bearing 10 of the stator base plate of a motor. Next, the rotor 8 of the motor is laid around the stator 9, and the rotor 8 is fixed to the end part of the shaft 4 with a screw 14. The blower blade device with the motor assembled in this way is inserted into a casing through the circular hole of the casing 1, and the shaft 5 of the blower blade is supported with the bearing 12 of the side plate 11 of the casing. Hereafter, the air blower device is completed by fixing the flange 17 of the above- mentioned stator base plate to the casing with screws 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blower used for an indoor unit of an air conditioner, and more particularly to an air blower capable of reducing the number of parts and weight.

[0002]

2. Description of the Related Art The structure of a conventional blower will be described with reference to the drawings. FIGS. Generally, as shown in FIG. 3, a blower device is provided with end plates a and b integrally on both ends of a blower blade, and one end plate a has a boss d mounted on a shaft c of a motor.
However, the other end plate b is provided with a support shaft e that is supported by the bearing of the casing f. The boss d and the support shaft e are usually concentrically opposed to each other. However, the axis of the motor shaft c and the axis of the boss d may deviate when the blower blade is assembled in the casing. In such a case, the blower blade is attached to the casing at an angle. Become.

Therefore, conventionally, an anti-vibration rubber is provided at the mounting portion between the blower blade and the motor shaft c as shown in FIG. 4 so as to absorb the above-mentioned deviation of the axis.
However, it is difficult to adjust the rubber hardness of the motor shaft insertion part and the end plate mounting part of this anti-vibration rubber, and considering the secular change of the anti-vibration rubber, it is not always necessary to use anti-vibration rubber in this part. This is not preferable, and considering the cost of the anti-vibration rubber and the like, it is convenient not to use the anti-vibration rubber if possible.

Therefore, in order to eliminate the need for the anti-vibration rubber described above, an air blower as shown in FIG. 5 has been proposed. In this blower, a rotor of a motor is formed at the end of a blower blade, a stator mounted on a casing is arranged in the rotor, and two bearings provided in the stator are used as blower blades. It is configured by supporting the attached shaft. That is, by integrally incorporating the motor in the blower blade, it is possible to eliminate the need to attach the vibration isolating rubber to the connecting portion between the motor shaft and the blower blade.

[0005]

However, in the air blower as shown in FIG. 5 described above, it is necessary to attach a rotor made of a magnet to the end portions of the air blower blades by bonding or the like, which is troublesome for that purpose, and the casing is required. However, there is a problem that the weight balance of the blower blade is poor when it is installed in the. Further, in order to endure this weight balance, it is necessary to dispose two bearings for supporting the shaft in the stator as shown in FIG. 5, which causes a problem in cost. Therefore, in the present invention, the number of bearings provided in the motor is reduced to one, and
It is an object of the present invention to solve the above-mentioned problems by proposing a blower device having a good weight balance when the blower blades are attached to the casing.

[0006]

Therefore, according to the present invention, the shafts 4 and 5 are fixed to both end plates of the blower blade 3, and one of the shafts 4 is also used as a motor shaft. 3, the rotor 8 of the motor is fixed to the shaft 4 which also serves as a motor shaft projecting outside from the casing in a state where the motor 3 is housed in the casing 1, and one bearing is arranged in the motor. This is a means for solving the problems.

[0007]

The shaft 4 also serving as the motor shaft fixed to the end plate of the blower blade 3 is inserted into the bearing 10 of the stator substrate 6 of the motor. Then, the rotor 8 of the motor is put on the stator 9, and the rotor 8 is fixed to the end of the shaft 4 by the screw 14.
The motorized blower blade device thus assembled is inserted into the casing through the circular hole 18 of the casing 1, and the shaft 5 of the blower blade is supported by the bearing 12 of the side plate 11 of the casing.
After that, the flange 17 of the stator substrate is fixed to the casing with screws 16. Finally, the blower is completed by covering the motor casing (not shown).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view of an air blower according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a casing, one side plate 11 of the casing 1 is provided with a bearing 12, and the other side plate 13 is provided with a circular hole 18 into which a blower blade 3 can be inserted. Has been formed. On the other hand, shafts 4 and 5 are fixed to both end plates a and b of the blower blade by appropriate means, and among them, the shaft 4 is formed longer than one shaft 5 so as to also serve as a shaft of a motor described later. .. The blower blade 3 inserted into the casing 1 through the circular hole 18 is
The shaft 5 is supported by the bearing 12 and arranged as shown.

The motor for rotating the blower blades 3 is provided with a stator substrate 6, a rotor 8, a stator 9 and the like. The stator substrate 6 is a flange for fixing the substrate 6 to the side plate 13 of the casing 1. 17 and a control board 7 attached to the flange 17, a bearing portion having a bearing 10 for supporting the shaft 5 of the blower blade, and a motor stator 9 fixed to the bearing portion. The flange 17 is the casing 1
It will be fixed to the side plate 13 by means of screws 16, and one bearing 10 is arranged in the bearing portion.

The rotor 8 is formed in a cylindrical shape for housing the stator 9, and a magnet 15 is attached to the inner circumference thereof. The rotor 8 is fixed to the end of the shaft 4 of the blower blade 3 by a screw 14 while being covered with the stator 9. Therefore, when the rotor 8 rotates in the above-described configuration, the shaft 4 supported by the bearing 10 on the stator side rotates, and the blower blades rotate.

The air blower configured as described above is assembled as follows. First, the shaft 4 fixed to the end plate of the blower blade 3 is inserted into the bearing 10 of the stator substrate 6 of the motor,
Then, the rotor 8 of the motor covered with the stator 9 is fixed to the end of the shaft 4 with the screw 14. The thus assembled motor-equipped blower blade device is inserted into the casing 1 through the circular hole 18 of the casing, the shaft 5 of the blower blade is supported by the bearing 12 of the side plate 11 of the casing, and then the flange 17 of the stator substrate is fixed. It is fixed to the casing by screws 16.
Further, a fan cover is completed by attaching a motor cover (not shown). In the air blower configured in this way, the motor is arranged outside the casing, and since it is not necessary to attach a magnet as a rotor to the air blower blade unlike the conventional one, the air blower with the air blower blade attached is not required. The weight is well balanced, the structure is further simplified, and the manufacturing cost can be reduced because the shaft of the blower blade can be supported by one bearing arranged in the motor.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment has an inner rotor type motor in which the arrangement of the rotor and the stator of the first embodiment is reversed. That is, in this example, as is apparent from the figure, the rotor is fixed to the shaft 4 of the blower blade so that the rotor cannot rotate and cannot move in the axial direction. A stator fixed by appropriate fixing means such as a screw is arranged. The shaft 4 of the blower blade is supported by a bearing 10 on the stator side. Since the configuration is the same as that of the first embodiment except for the above configuration, the details thereof will be omitted. Similar to the first embodiment, this embodiment can also simplify the assembling work and reduce the manufacturing cost.

[0014]

As described above in detail, the blower according to the present invention has the motor arranged outside the casing, and
Since the number of bearings in the motor is one, the weight balance with the blower blades attached is good, the structure is further simplified, and the bearing of the blower blades is located in the motor. Since it can be supported, the manufacturing cost can be reduced. Further, since the motor shaft can be fixed to the end plates of the blower blades in advance, the accuracy of alignment of the shafts fixed to both end plates is improved, and vibration and noise when rotating the blower blades can be reduced. It is possible to exert the effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of an air blower according to a first embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view of the motor and the blower blades of the blower according to the second embodiment of the present invention assembled together.

FIG. 3 is a side view of a conventional blower.

FIG. 4 is an explanatory diagram of a main part of FIG.

FIG. 5 is a side view of another conventional blower.

[Explanation of symbols]

 1 Casing 3 Blower Blades 4, 5 Shaft 7 Control Board 8 Rotor 9 Stator 10 Bearing

Claims (2)

[Claims] 1. A shaft 4, 5 is fixed to both end plates of the blower blade 3, one of the shafts 4 is also used as a motor shaft, and the blower blade 3 is housed in a casing 1. An air blower characterized in that a rotor 8 of a motor is fixed to the shaft 4 that also serves as a motor shaft protruding outside the casing. 2. The shaft 4 is supported by a single bearing mounted on the stator of the motor.
The air blower described in.