JP2023048647A - Motor, and air conditioner using the same - Google Patents

Abstract

To reduce abnormal noise by twist resonance by reducing vibration of the twist resonance of a shaft connected with a motor and a Sirocco fan.SOLUTION: In a motor 4 connected with a Sirocco fan 5 at a bar-like shaft 8, the shaft 8 comprises a dynamic vibration absorber 6 between the motor 4 and the Sirocco fan 5, and the dynamic vibration absorber 6 is formed of a boss 61 fixed to the shaft 8, vibration-proof rubber 62 attached to a fixing part 611 in which the boss 61 becomes thin on the motor 4 side of the boss 61, a plate 63 engaged with the boss 61 via attachment to the vibration-proof rubber 62, and a ring 64 integrally molded with the plate 63.SELECTED DRAWING: Figure 9

Description

The present invention relates to countermeasures against noise generated from motors and blowing fans used in air conditioners and the like.

2. Description of the Related Art Rotating parts such as motors and blowers used in home electric appliances such as air conditioners are required to reduce noise by reducing vibration during rotation. However, when the blower fan is attached to the shaft of the motor and rotated by the rotational torque generated by the motor, the shaft connecting the motor and the blower fan is twisted under the influence of the weight of the blower fan. Since a force that tries to untwist also acts on the shaft, the occurrence of these two forces causes torsional vibration in the shaft. When the frequency of this torsional vibration approaches the frequency of torque fluctuations occurring in the rotational torque of the motor, resonance causing noise occurs (hereinafter also referred to as torsional resonance).

Therefore, by partially thinning the shaft, the frequency of torsional vibration and the frequency of torque fluctuation are shifted to prevent torsional resonance, thereby reducing vibration and noise. (See Patent Document 1, for example)

JP-A-2005-12964

However, even if torsional resonance can be prevented by partially thinning the shaft that connects the motor and the blower fan, the durability of the shaft may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor capable of preventing torsional resonance without reducing the durability of the shaft, and an air conditioner using the same motor.

According to the present invention, there is provided a motor connected to a blower fan by a rod-shaped shaft, wherein the shaft is provided with a dynamic vibration reducer between the motor and the blower fan.

The dynamic vibration reducer includes a boss fixed to the shaft, a vibration isolator bonded to a fixed portion of the boss on the motor side of the boss, and a vibration isolator bonded to the vibration isolator to engage with the boss. and a ring integrally formed with the plate.

Also, the ring has a thin disk shape, and the plate is positioned in the center of the disk shape, and is characterized by being a weight together with the plate.

The motor is used in an air conditioner.

ADVANTAGE OF THE INVENTION According to this invention, the motor which can prevent torsional resonance, and the air conditioner using the same motor can be provided, without reducing the durability of a shaft.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the state which installed the air conditioner which concerns on this invention in the house. 1 is a perspective view of an air conditioner according to the present invention; FIG. AA sectional view of FIG. BB sectional view of FIG. FIG. 3 is a perspective view of the air conditioner of FIG. 2 with the top plate on the blower chamber side removed; FIG. 6 is an enlarged view of the motor portion of FIG. 5; FIG. 2 is a side view of a motor, a shaft, an air blower, and a dynamic vibration absorber according to the present invention; 1 is a perspective view of a dynamic vibration reducer according to the present invention; FIG. 1 is an exploded view of a dynamic vibration reducer according to the present invention; FIG. CC sectional view of FIG. Formula for calculating the natural frequency. FIG. 4 is a diagram showing the difference between the amplitude of the resonance point of the conventional art and the amplitude of the resonance point of the present invention; FIG. 2 is a side view of a motor, a shaft, a fan, and a dynamic vibration absorber mounted on an air conditioner having two fans.

Embodiments of the present invention will now be described with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a sectional view showing an embodiment of the invention, and FIG. 2 is a perspective view of an air conditioner 1 according to an embodiment of the invention. The air conditioner 1 is a ceiling cassette type air conditioner that is installed by being suspended in the ceiling space 90 of a house with bolts 110 that are connected to hanging metal fittings 11 .

The interior of a rectangular parallelepiped housing 10 made of a steel plate is partitioned into a blower chamber 2 having a blower fan 5 and a heat exchanger chamber 3 having a heat exchanger 31 by a partition plate 12 that partitions the center of the housing 10. be done. In a side surface of the housing 10, a suction port 13 is opened on the side of the blower chamber 2 with a partition plate 12 interposed therebetween, and an air outlet 14 is opened on the side of the heat exchanger chamber 3. The air inlet 13 is connected by an indoor air inlet 92 provided on the ceiling 91 of the room and a duct 94, and the air outlet 14 is connected by an indoor air outlet 93 and a duct 95 provided on the ceiling 91 of the room.
In the following description, the housing 10 has a surface with the top plate 15 on the ceiling 90 side as the top surface, a surface with the bottom plate 16 on the ceiling 91 side in the room as the bottom surface, a surface with the suction port 13 as the front surface, and an air outlet. The surface with 14 is the rear surface, the surface with the drain pipe 34 to be described later is the left side, and the opposite side of the left side is the right side.

3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is a sectional view taken along line BB of FIG. FIG. 5 is a view of FIG. 2 with the top plate 15 removed, and FIG. 6 is an enlarged view of the motor portion of FIG.

As shown in FIG. 3 , the heat exchanger chamber 3 includes a heat exchanger 31 , and a drain sheet 32 and a drain pan 33 below the heat exchanger 31 for receiving drain water discharged from the heat exchanger 31 . Drain water flows from the drain pan 33 to the drain pipe 34 shown in FIG.

As shown in FIG. 4 , the electric component unit 7 is arranged on the left side of the blower chamber 2 . , and the blower fan 5 is arranged on the right side thereof.

The motor 4 is fixed to the partition plate 12 with a motor mount 41 . The motor 4 has a rotor (not shown) formed by stacking steel plates, and an elongated rod-shaped shaft 8 is press-fitted into a shaft mounting hole (not shown) formed in the center of the rotor. Both sides of the motor 4 are provided with a bearing 42 and a bearing 43 that rotatably support the shaft 8 .

The blower fan 5 is a sirocco fan. The blower fan 5 is connected to the motor 4 by fixing the shaft 8 to the center of a disk-shaped center wall plate 51 at the center of the blower fan 5 .

As shown in FIGS. 3 to 5, the blower fan 5 is surrounded by a fan case 52. As shown in FIG. The fan case 52 is fixed to the partition plate 12 using claws and screws (not shown) around the opening 53 on the partition plate 12 side. Since the opening 53 of the fan case 52 and the partition plate opening 121 are aligned, the air S taken into the fan case 52 by the rotation of the blower fan 5 flows from the opening 53 through the partition plate opening 121 into the heat exchanger chamber 3. is blown to

6 is an enlarged view of the motor portion of FIG. 5, and FIG. 7 is a front view of the motor 4, shaft 8, blower fan 5, and dynamic vibration reducer 6. FIG. The shaft 8 has a dynamic vibration reducer 6 between the bearing 43 and the air inlet 54 of the blower fan 5 . The dynamic vibration reducer 6 suppresses torsional resonance between the blower fan 5 and the rotor to reduce vibration and noise. In addition, since the ring 64 of the dynamic vibration reducer 6, which will be described later, is arranged as close to the motor as possible, the dynamic vibration reducer 6 does not block the flow of air sucked into the blower fan 5. FIG.

8 to 10 show the dynamic vibration reducer 6. FIG. 8 is a perspective view of the dynamic vibration reducer 6, FIG. 9 is an exploded view of the dynamic vibration reducer 6, and FIG. 10 is a cross-sectional view of FIG. A boss 61 made of aluminum die-cast into which the shaft 8 is inserted, and an anti-vibration rubber made of chloroprene rubber having an outer diameter one size larger than that of the boss 61 fixed to a fixing portion 611 at the end of the boss 61 on the side of the motor 4. 62, a disk-shaped plate 63 made of aluminum die-casting that is engaged with the boss 61 by being adhered around the rubber vibration isolator 62, and a disk made of polypropylene that is fixed around the plate 63 and integrated with the plate 63. It is formed with a ring 64 of shape.

The ring 64 corresponds to the mass body (weight) of the dynamic vibration reducer 6, and the vibration of the shaft 8 is absorbed by the ring 64 and vibrated instead. Therefore, by adjusting the size and weight of the ring 64, the vibration and noise in the dynamic vibration absorber 6 can be reduced optimally.

A plate 63 connects the ring 64 and the vibration isolator 62 . It also has the same effect as the weight of the dynamic vibration reducer 6 as the ring.

The vibration isolator 62 corresponds to a damper of the dynamic vibration absorber 6, and converts kinetic energy, which is vibration of torsional vibration, into heat energy and consumes it, thereby damping torsional vibration.

A shaft 8 penetrating through the center of the boss 61 is fixed to the boss 61 by a screw 65 screwed into a screw hole 641 at the top of the boss 61 . As a result, the ring 64, the plate 63 and the anti-vibration rubber 62 are also fixed to the shaft 8. As shown in FIG.

The dynamic vibration reducer 6 aims at suppressing the vibration of the shaft 8 by attaching a ring 64 as a weight to the shaft 8 so that the vibration of the shaft 8 is absorbed by the ring 64 and vibrates instead. Also, the rubber vibration isolator 62 functions as a damper, and converts kinetic energy, which is vibration of the ring 64, into heat energy and consumes it, thereby damping torsional vibration. FIG. 11 is a "theoretical formula of eigenvalue of torsional vibration", and FIG. 12 is a diagram of vibration and eigenvalue. From this, it can be seen that the harder the shaft is twisted, the higher the eigenvalue.

The dynamic vibration reducer 6 is provided between the shaft 8, the bearing 43, and the air inlet 54 of the blower fan 5, but since the space between the blower fan 5 and the motor 4 forms an air passage, it does not cause wind resistance. It is desirable to provide it as close to the motor 4 as possible.

Also, if there is no problem with the size of the housing, the dynamic vibration reducer 6 can be installed at the end of the motor 4 (dynamic vibration reducer 6 → motor 4 → blower fan 5) or at the end of the blower fan 5 (motor 4 → blower fan 5). → It may be installed in the dynamic vibration absorber 6).

In FIG. 13, two blower fans 5 are connected to the motor 4 with a shaft 8. As shown in FIG. In this case as well, in the air conditioner 1 , the dynamic vibration absorber 6 is provided on the shaft 8 connecting the motor 4 and the blower fan 5 , so that the vibration transmitted to the shaft 8 is absorbed by the dynamic vibration absorber 6 . As a result, noise at the torsional resonance speed can be reduced, the resonance speed can be used, and the vibration of the blower fan 5 can be reduced without thinning the shaft.

As described above, in the air conditioner 1 , the vibration transmitted to the shaft 8 is absorbed by the dynamic vibration reducer 6 by providing the dynamic vibration reducer 6 on the shaft 8 connecting the motor 4 and the blower fan 5 . As a result, torsional resonance can be prevented without lowering the durability of the shaft by making the shaft thinner. Therefore, noise at the torsional resonance rotation speed is reduced, the resonance rotation speed can be used, and the vibration of the blower fan 5 is reduced.

1: Air conditioner, 10: Housing, 11: Suspension fitting, 110: Bolt, 12: Partition plate, 121: Partition plate opening, 13: Suction port, 14: Air outlet, 15: Top plate, 16: Bottom plate 2: blower chamber 3: heat exchanger chamber, 31: heat exchanger, 32: drain sheet, 33: drain pan, 34: drain pipe 4: motor, 41: motor mounting base, 42, 43: bearing 5: blower fan, 51: Central wall, 52: Fan case, 53: Opening, 54: Air inlet 6: Dynamic vibration absorber, 61: Boss, 62: Anti-vibration rubber, 63: Plate, 64: Ring 7: Electrical component unit 8: Shaft 90 91: Ceiling 92: Indoor air intake 93: Indoor air outlet 94, 95: Duct S: Air

Claims (4)

What is claimed is: 1. A motor comprising a rod-shaped shaft and connected to a blower fan via the shaft, wherein the shaft is provided with a dynamic vibration reducer between the motor and the blower fan. The dynamic vibration reducer includes a boss fixed to the shaft, a vibration isolator bonded to a fixed portion of the boss on the motor side of the boss, and a vibration isolator bonded to the vibration isolator to engage with the boss. 2. The motor according to claim 1, wherein the motor is formed of a plate and a ring integrally molded with the plate. 3. The motor according to claim 2, wherein said ring is a thin disc, and said plate is positioned in the center of the disc and serves as a weight together with said plate. An air conditioner using the motor according to any one of claims 1 to 3.

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