JPH0610480B2 - Blower - Google Patents

Description

The present invention relates to a centrifugal blower or an axial flow blower incorporated in an air conditioner.

(B) Conventional technology In a motor of a blower that uses an air conditioner, a harmonic electromagnetic force is generated inside, which acts as a vibration source and resonates with a fan that is coupled to the shaft of the motor, causing noise. As described in Japanese Patent Publication No. 52-48324, a metal bush having an elastic body fixed to the inner surface is press-fitted onto a shaft with an adhesive, and the metal bush is integrally molded with a fan. The fan and the shaft are connected to each other through an elastic body by fitting the end of a screw fitted into the boss and screwed with the boss to a metal bush.

(C) Problems to be Solved by the Invention In the structure presented in the above publication, the size of the boss integrally formed with the fan is changed unless the shaft is thinned by the total thickness of the metal bush and the elastic body. Must be
There was a problem that lacked versatility.

In addition, since there is a limit to how thin the shaft can be made, the thickness of the elastic body cannot be made so large that vibration may not be sufficiently absorbed, and as shown in FIG. 2 of the above publication. There is a possibility that the metal bush partially contacts the shaft and the vibration of the shaft is transmitted to the fan via the metal bush. Also, if the screw is tightened too much, the tip of this screw may be pressed strongly against the metal bush, and this bush may become eccentric with respect to the shaft. There is a problem that the effect of absorbing vibration is reduced because the body is compressed.

The present invention solves the above problems by integrally assembling an elastic body on a boss that connects a shaft of a motor and a fan.

(D) Means for Solving Problems The present invention provides a boss of a blower, an inner annular body into which a shaft of a motor is fitted and fixed to the shaft with a screw, an outer annular body to which a fan is fixed, and It is composed of an elastic body embedded between both annular bodies.

(E) Working Set the preformed inner and outer annular bodies in the mold jig and inject the elastic material made of neoprene rubber between the two annular bodies to cure them. The body is fixed via an elastic body, and the boss is integrally formed. The fan is completed by fixing the fan to the outer annular body of the boss thus formed, fitting the shaft of the motor into the inner annular body, and fixing the inner annular body and the shaft with screws. Since the fan and the shaft are connected via the elastic body of the boss, the electromagnetic vibration generated by the motor is not transmitted from the shaft to the fan.

(F) Embodiments FIG. 1 is a vertical cross-sectional view of a centrifugal blower showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a ceiling-embedded air conditioner incorporating this blower, and FIG. Is a perspective view of this air conditioner. The air conditioner has a sheet metal unit body (2) with an insulating material (1) attached to the inner wall, a suction grille (3) in the center, and four sides of the outer peripheral part. And a ventilation decorative panel (10) provided with air outlets (6), (7), (8) and (9) with wind direction changing plates (4) and (5).

(11) is a nozzle port that guides indoor air from the suction grill (3) through the air filter (12) to the blower (13) described later, and (14) is a support leg (16) on the nozzle plate (15). An attached fan motor, (17) is an annular drain pan arranged along the outer periphery of the nozzle opening (11), and (18) is an annular heat exchanger arranged so as to surround the blower (13). , (19) is the unit body
A hanging bolt for pushing (2) from the ceiling hole (21) of the ceiling plate (20) into the ceiling space (22) and suspending and fixing it to the ceiling beam (23).

With this configuration, the room air sucked into the blower (13) from the suction grill (3) through the nozzle opening (11) is discharged from the blower (13) in the entire circumferential direction, and then the heat exchanger (18) is discharged. When passing, it is cooled to about -5 ℃ during cooling and about 60 ℃ during heating.
To be heated. The cooled or heated air has a boomerang-shaped wind direction change plate (4) and a crescent-shaped wind direction change plate.
By (5), the air is blown obliquely downward during cooling, and is blown downwards during heating, thereby effectively cooling and heating the room.

Then, the blower (13) described above includes the main plate (24) and the ring-shaped side plate.
A fan (27) with multiple wings (26) crimped across (25)
And a boss (29) that couples this fan to the shaft (28) of the motor (14), which boss (2)
An inner annular body (31) made of carbon steel in which 8) is fitted and fixed to this shaft with a screw (30), and an outer annular body (32) to which the main plate (24) of the fan (27) is fixed, The elastic body (33) made of neoprene rubber is embedded between the annular bodies.

Incidentally, (34) is an auxiliary annular body press-fitted into the tubular portion (35) of the outer annular body (32), (36) is a main plate (24) around the outer annular body (32) peripheral portion (3).
7) and a reinforcing plate to be held, (38) is these three plates (24) (32) (3
A rivet that fastens 6) together, and (39) is the tubular part of the outer ring (32)
(35) is an opening provided so as to avoid contact with the inner annular body (31).

Next, the manufacturing sequence of the blower (13) will be described. The preformed inner annular body (31) and the auxiliary annular body (34) are set in the mold jig, and the neoprene is placed between the two annular bodies. When an elastic material made of rubber is injected and cured, the elastic body (33) is heat-welded to both annular bodies (31) and (34) to be integrally molded. After that,
When this integrally molded product is taken out of the mold jig and press-fitted into the tubular portion (35) of the outer annular body (32) which has been previously molded, the boss (29) is completed.

At the same time, the fan (27) is preassembled by crimping a number of blades (26) across the main plate (24) and the ring-shaped side plate (25), and the main plate (24) of this fan (27) is pre-assembled. The blower (13) shown in Fig. 1 is completed by sandwiching between the peripheral portion (37) of the outer annular body (32) and the reinforcing plate (36) and fixing them with rivets (38).

Then, the shaft (28) of the motor (14) is fitted into the inner annular body (31) so that the annular body (31) and the shaft (28) are screwed (3).
When it is tightened with (0), the blower (13) and the motor (14) are assembled as shown in FIG.

Thus, since the fan (27) and the shaft (28) are coupled via the elastic body (33) of the boss (29), electromagnetic vibration generated by the motor (14) is transmitted from the shaft (28) to the fan (28). It is not transmitted to 27).

FIG. 4 to FIG. 6 are vertical sectional views of the essential parts of the blower showing another embodiment of the present invention. 4 is different from FIG. 1 in that a through hole (40) for inserting a screw (30) is provided in a side wall of a tubular portion (35) of an outer annular body (32), and an auxiliary annular body (34). ) Is not used, the elastic body (33) is embedded between the inner annular body (31) and the outer annular body (32), but the elastic body (33) has the effect of preventing the transmission of electromagnetic vibrations. This is similar to the case of FIG.

In FIG. 1 as well, the elastic body (33) may be embedded between the inner annular body (31) and the outer annular body (32) without using the auxiliary annular body (34). Large outer ring (32)
Requires a large mold jig.

Next, FIG. 5 shows that the shaft (28) is provided with a flat portion (41) and the flat portion is fitted into the projecting portion (42) of the inner annular body (31) so that the shaft (28) and the boss (29) are joined together. Shaft to prevent rotation
The (28) and the inner annular body (31) are screwed (30) from above via a washer (43). Fig. 6 shows the inner ring (3
1) Left and right protrusions (44) (44) and shaft (28) step (45)
The detent plate (46) fitted to and is pressed by a washer (43), and the washer (43) is screwed (30) to the shaft (28) from above. Even in the structure shown in FIGS. 5 and 6, the elastic body (33) can be used to prevent electromagnetic vibrations as described above, but since the screw (30) is attached from above the blower (13), the motor ( To remove 14) from the state shown in Fig. 2, nozzle plate (15)
There is a problem that the tool for removing the screw (30) cannot be inserted between the blower (13) and the heat insulating material (1) unless the motor (14) and the blower (13) are removed to remove the screw (30).

(G) According to the present invention, according to the present invention, the boss of the blower, the inner annular body in which the shaft of the motor is fitted and fixed to the shaft by the screw, the outer annular body to which the fan is fixed, and the both annular It is composed of an elastic body embedded between the body, the motor shaft and fan can be used without any modification of the conventional one, and it can be used not only as a centrifugal fan but also as an axial fan. In addition, since the elastic body can have a large thickness, the elastic body can surely absorb the electromagnetic vibration generated in the motor and prevent the vibration from being transmitted from the shaft to the fan.

Moreover, even if the screws for fixing the boss to the shaft are overtightened, the effect of preventing vibration by the elastic body is not adversely affected at all, and the boss is not eccentrically attached to the shaft, and noise is generated. Can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a centrifugal blower showing an embodiment of the present invention, FIG. 2 is a vertical sectional view of a ceiling-embedded air conditioner incorporating the blower, and FIG. 3 is a view of this air conditioner. All of the perspective views and FIGS. 4 to 6 are vertical cross-sectional views of a main part of a blower showing another embodiment of the present invention. (13) …… Blower, (14) …… Motor, (27) …… Fan, (2
8) …… Shaft, (29) …… Boss, (30) …… Screw, (31)…
… Inner ring, (32) …… Outer ring, (33) …… Elastic body.

Claims (1)

[Claims] 1. A blower comprising a motor shaft and a fan coupled to each other by a boss, wherein the boss has an inner annular body into which the shaft is fitted and fixed to the shaft by a screw, and an outer annular body to which the fan is fixed. A blower comprising a body and an elastic body embedded between the two annular bodies.