JPH1162891A - Turbofan and air conditioner provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of vibration at the time of revolution of a turbofan by interposing and sticking vibration-proof rubber between the inner peripheral surface of a boss of an impeller and the outer peripheral surface of a sleeve, screwing a nut into the tip of a rotary shaft passing through the sleeve and fastening the sleeve to the rotary shaft. SOLUTION: An outer peripheral surface of vibration-proof rubber 33 is bonded to the inner peripheral surface of a boss 31, the inner peripheral surface is bonded to the outer peripheral surface of a sleeve 32, and the boss 31, the vibration-proof rubber 33 and the sleeve 32 are integrated. After the sleeve 32 is fitted from the lower end into a semicircular part 37a in cross section on the lower part of a rotary shaft 37 of a motor and passes through a through-hole 36, a nut 39 is fastened to a screw thread part on the lower end part of the rotary shaft 37 and the sleeve 32 is mounted on the rotary shaft 37. Because the nut 39 is abutted on the lower end face of the sleeve 32 and is not abutted on an impeller 30 and vibration proof rubber 33, the vibration proof rubber 33 does not deform and the impeller 30 does not lose its balance, even if the impeller 30 is assembled with the rotary shaft 37 if the impeller 30 is balanced by itself. Therefore, vibration is not generated at the time of revolution of a turbofan 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a turbofan and an air conditioner having the same.

[0002]

2. Description of the Related Art FIGS. 2 and 3 show an example of a conventional ceiling-mounted air conditioner. As shown in FIG.
A motor 5, a drain pan 10, a baffle plate 12, a heat exchanger 7, a turbofan 6, and the like are disposed inside a cabinet 2 embedded in the cabinet 2. The lower opening of the cabinet 2 is covered by a decorative panel 8. . As shown in FIG. 2, a suction port 3 is formed at the center of the decorative panel 8, and an air outlet 4 is formed around the suction port 3.

When the turbo fan 6 is driven by the motor 5, the room air in the room 9 flows from the suction port 3 to the suction grill 11,
After passing through the filter 13, it is guided to the baffle plate 12, is sucked into the turbo fan 6, is energized, and is cooled or heated in the process of flowing through the heat exchanger 7 to form conditioned air from the outlet 4. It is blown out into the chamber 9.

FIG. 4 shows a support structure of the turbofan 6. An anti-vibration rubber 23 is sandwiched between a boss 21 formed at the center of an impeller 20 of the turbofan 6 and a sleeve 22, and the sleeve 22, the anti-vibration rubber 24 and the washer 25 are fitted to the rotary shaft 26 of the motor 5. By sleeve 22 and washer 25
The turbo fan 6 is attached to the rotary shaft 26 of the motor 5 by interposing the vibration isolating rubber 24 between the shaft and the nut 27 and screwing the nut 27 into the tip of the rotary shaft 26.

[0005]

In the above-mentioned conventional supporting structure, the vibration-proof rubber is tightened by tightening the nut 27.
Since the deformations 23 and 24 are not uniform, the center of gravity of the turbofan 6 may be displaced from the axis of the rotary shaft 26 to cause vibration if the deformation amounts are not uniform.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first aspect of the present invention is to provide an inner peripheral surface of an impeller boss and an outer peripheral surface of a sleeve. A turbofan, wherein a vibration isolating rubber is interposed and bonded to a surface of the rotary shaft, and the sleeve is fastened to the rotary shaft by screwing a nut into a tip of the rotary shaft penetrating the sleeve.

The gist of the second invention is that a turbofan according to claim 1 is provided inside a cabinet buried in a ceiling, and the turbofan is fixed to a lower surface of a top plate of the cabinet. By driving through the rotary shaft, the room air sucked into the cabinet from the suction opening formed in the center of the decorative panel covering the lower opening of the cabinet is guided to the baffle plate through the suction grill and the filter. Is energized by the turbofan,
The air conditioner is characterized in that after being cooled or heated in a heat exchanger, the air is blown into a room from an outlet formed in the decorative panel.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. 1, in which (A) is a partial longitudinal sectional view showing a turbofan support structure, and (B) is a view taken along the line BB of (A). It is an arrow view.

An anti-vibration rubber 33 is interposed between the inner peripheral surface of the boss 31 formed at the center of the impeller 30 of the turbofan 6 and the outer peripheral surface of the sleeve 32.

As shown in FIG. 1 (B), a large number of irregularities 34 are formed on the inner peripheral surface of the boss 31 and extend in the axial direction at predetermined intervals in the circumferential direction. A part 38 is formed. The sleeve 32 has a half-moon shaped through-hole
A large number of irregularities 35 are formed on the outer peripheral surface of the outer peripheral surface and extend in the axial direction at predetermined intervals in the circumferential direction.

The outer peripheral surface of the vibration isolating rubber 33 is adhered to the inner peripheral surface of the boss 31, and the inner peripheral surface of the vibration isolating rubber 33 is adhered to the outer peripheral surface of the sleeve 32. The sleeve 32 is integrated.

A lower half of a rotating shaft 37 of a motor (not shown) is provided with a
After fitting 32 through the through hole 36, rotate the shaft
The sleeve 32 is attached to the rotary shaft 37 by screwing and tightening a nut 39 to a thread portion engraved on the lower end of the 37.

Since the nut 39 contacts only the lower end surface of the sleeve 32 and does not contact the impeller 30 and the vibration isolating rubber 33, the vibration isolating rubber 33 is not deformed.
If it is balanced by 30 itself, this will be a rotating shaft 37
Since the balance is not lost even if the turbo fan 6 is assembled, no vibration occurs when the turbo fan 6 rotates.

Further, the outer peripheral surface of the vibration isolating rubber 33 is adhered to the inner peripheral surface of the boss 31 on which the unevenness 34 and the shoulder 38 are formed.
Since the inner peripheral surface of 33 is bonded to the outer peripheral surface of the sleeve 32 on which the irregularities 35 are formed, even when the rotational torque of the rotating shaft 37 acts, the vibration-proof rubber 33 does not peel off from the boss 31 and the sleeve 32. Further, the impeller 30 does not peel off from the vibration isolating rubber 33 due to its own weight and does not fall off. Other configurations and operations are the same as those of the conventional one shown in FIGS. 2 and 3, and corresponding members are denoted by the same reference numerals and description thereof is omitted.

[0015]

According to the present invention, an anti-vibration rubber is interposed and bonded between the inner peripheral surface of the boss of the impeller and the outer peripheral surface of the sleeve.
Since the sleeve is fastened to the rotary shaft by screwing the nut into the end of the rotary shaft penetrating the sleeve, even if the nut is tightened, the vibration isolating rubber is not deformed, and therefore the balance of the turbofan is not lost. Therefore, it is possible to prevent the occurrence of vibration when the turbofan rotates.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a partial vertical cross-sectional view of a turbofan support structure, and (B) is a view taken along arrow BB of (A).

FIG. 2 is a perspective view of a conventional ceiling-mounted air conditioner.

FIG. 3 is a longitudinal sectional view of a conventional ceiling-mounted air conditioner.

FIG. 4 is a partial longitudinal sectional view showing a conventional turbofan support structure.

[Explanation of symbols]

 6 Turbo fan 30 Impeller 31 Boss 32 Sleeve 33 Anti-vibration rubber 37 Rotating shaft 39 Nut

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Tatezo Kannon 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya-shi Nagoya Research Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (2)

[Claims] 1. The sleeve according to claim 1, wherein an anti-vibration rubber is interposed between the inner peripheral surface of the boss of the impeller and the outer peripheral surface of the sleeve, and a nut is screwed into a tip of a rotary shaft penetrating the sleeve. The turbofan is characterized in that it is fastened to the rotating shaft. 2. A turbofan according to claim 1, which is disposed inside a cabinet buried in a ceiling, and is driven via a rotary shaft of a motor fixed to a lower surface of a top plate of the cabinet. Room air sucked into the cabinet from a suction opening formed in the center of the decorative panel covering the lower opening of the cabinet is guided by a suction plate and a wind guide plate through a filter, and is energized by the turbofan. An air conditioner characterized in that after being cooled or heated by a heat exchanger, the air is blown into a room from an outlet formed in the decorative panel.