JPS5949440B2 - Air blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air blower, and more particularly to an air blower in which a fan driving motor is attached to a side wall of a scroll.

A conventional blower device will be explained based on FIGS. 1 to 4.

Generally, a blower device has a fan 1 in the center, and this fan 1 is fixed to a shaft 3 of a motor 2.

A scroll 4 is provided on the outer periphery of the fan 1 to form a spiral ventilation passage.

The scroll 4 is composed of two members: a suction port side scroll 5 and a motor mounting side scroll 6.

The suction port side scroll 5 and the motor mounting side scroll 6 are fixed together by a clamp mechanism (not shown) provided at the abutting portion to form the scroll 4.

The scroll 5 on the suction port side has a bell mouth 7 on the outer periphery of the suction port.
is formed.

The fan 1 is mounted on the side wall 13 of the scroll 6 on the motor mounting side.
A hole 8 is provided so that the motor 2 can be attached and detached with the motor 2 attached.

In addition, female threads 9 are provided at three locations near the outer periphery of the hole 8 on the side wall 13 of the scroll 6 on the motor mounting side.

The outer peripheral portion of the motor 2 is fixed by a mounting foot 10, and a relief portion 11 is provided on the mounting foot 10 in correspondence with the position of the female screw 9.

The motor 2 is screwed to a female thread 9 via a mounting foot 10.

A nose portion 12 protrudes toward the inside of the ventilation path at the joint between the outer circumferential wall at the start of winding of the scroll 4 and the inner wall near the discharge port.
is formed.

One of the three female screws 9 is connected to this nose portion 12.
Located nearby.

The suction port side scroll 5 and the motor mounting side scroll 6 are each provided with a side wall 13 and an outer circumferential wall 14, which form a ventilation path.

When a conventional blower device with such a configuration is operated,
Vibrations caused by the rotation of the motor 2 are transmitted to the side wall 13 of the scroll 4 via the mounting foot 10.

A hole 8 for inserting the fan 1 is provided near the female thread 9 on the side wall 13 of the scroll 4 to which the motor 2 is attached, and the female thread 9 is provided on the plate portion of the side wall 13 to assist in strength. It is very weak because there is no.

Furthermore, the side wall 13 of the scroll tends to be made thinner and thinner in order to reduce the weight of the device and reduce the cost to 1.

Therefore, vibrations transmitted from the motor 2 are amplified at the side wall 13 of the scroll 4.

Particularly when the blower is used in an automobile or the like with large vibrations, the vibration of the scroll 4 may generate noise, and if the frequency matches the resonance point, the scroll 4 may be damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air blowing device in which vibrations of the scroll itself due to rotation of a motor or fan and vibrations from the outside are minimized.

The present invention aims to improve the rigidity of the fixing part and reduce vibration by adding a rib to the back of the nose of the scroll, that is, to the outside recess of the ventilation passage, and by providing a fixing part for the motor mounting foot on this rib. It is.

Hereinafter, embodiments of the present invention will be described based on FIGS. 5 to 7.

Note that here, the same components as those in the conventional example described above are designated by the same reference numerals to simplify the explanation.

FIG. 5 is a view of the motor mounting side scroll 16 of the air blower according to the present invention, viewed from inside.

The scroll 16 consists of a side wall 17, an outer peripheral wall 18, and an inner wall 19 provided near the discharge port of the scroll.
A hole 8 for inserting the fan 1 is provided near the center of the fan 7 .

A rib 21 is provided on the back surface of the nose portion 20 formed at the joint between the winding start portion of the outer circumferential wall 18 and the inner wall 19 near the discharge port, that is, the outer recessed portion of the scroll air passage.

The rib 21 is composed of a horizontal rib 22 formed as an extension of the side wall 17 and a vertical rib 23 having the same width as the outer circumferential wall 18 and the inner wall 19 and provided perpendicularly to the horizontal rib 22.

These ribs 21 are resin-molded integrally with the scroll 16.

The side wall 17 is provided with three female screws 9 around the hole 8 as fixing parts for attaching the motor.

One of the three female threads 9 is provided in the rib 21 portion.

The mounting leg 10 is screwed onto these three female screws 9 at a relief portion 11 via a cushion or the like.

In the air blower constructed as described above, when the motor 2 is driven, the fan 1 fixed to the shaft 3 of the motor 2 rotates within the scroll 16, and the rotation of the fan 1 causes the air sucked from the suction port to flow through the discharge port. More air is blown.

At this time, vibrations generated by rotation of the motor 2 or the fan 1 are transmitted to the mounting foot 10.

According to the present embodiment, one of the three mounting relief portions 11 provided on the mounting foot 10 is located on the rib 21, thereby improving the mounting strength.

Further, since the number of female screws 9 as fixing portions provided in the ventilation passage area of the side wall 17 is reduced from three in the conventional case to two, the strength of the side wall 17 itself is improved.

Furthermore, the mounting foot 10 is generally manufactured symmetrically with respect to the center of the motor 2 in many cases.

That is, the pitches of the mounting relief parts 11 of the mounting legs 10 are equally spaced (in this embodiment, they are equally spaced at 120 degrees), and the distances from the center thereof are also equal.

In the mounting foot 10 manufactured in this way, the female screw 9 for fixing the mounting relief part 11 is located on the outside of the ventilation passage as in this embodiment, rather than the case where the female screw 9 is located on the inside of the ventilation passage from the nose part 20. However, the distance from the center to the mounting relief portion 11 can be increased.

As a result, the female thread 9 other than the vicinity of the nose portion 20 is also provided at a position away from the edge of the hole 8, which approaches the outer circumferential wall 18 of the scroll, leading to an improvement in the strength of the scroll 16.

That is, all three mounting feet 10 of the motor 2 are fixed to the side wall 1T of the scroll 16 at positions with high rigidity and sufficient strength, so that even if vibrations occur due to the rotation of the motor 2 and fan 1, the scroll 16 This does not adversely affect the inner body or the female threaded portion 9 serving as the fixing portion of the mounting foot 10.

In the present invention, the blower has a structure in which a fixed part for attaching the motor is provided on the back of the nose part, so the blower has a scroll that can sufficiently withstand vibrations caused by the rotation of the motor and fan and external vibrations. It has the effect of being able to provide

[Brief Description of the Drawings] Fig. 1 is a front sectional view showing a conventional blower device, Fig. 2 is a perspective view showing the suction port side scroll of Fig. 1, and Fig. 3 is a front sectional view showing a conventional blower device.
FIG. 4 is a front view of FIG. 3, FIG. 5 is a rear view of the motor-mounted scroll of the blower according to the present invention, and FIG. 6 is a perspective view of the motor-mounted scroll of FIG. Vl
FIG. 7 is an enlarged cross-sectional view taken along line -VI, and is a front view showing the motor in FIG. 5 in an attached state. 1...Fan, 2...Motor, 8...
... Hole, 9 ... Female thread as a fixing part, 1
0...Motor mounting foot, 11...Mounting relief part, 16...Scroll, 17...
・Side wall, 18...outer wall, 19...inner wall, 20...nose part, 21...rib, 22...horizontal rib , 23... Vertical rib.

Claims (1)

[Claims] 1. A scroll that forms a spiral ventilation passage, a fan provided at the center of the scroll, a motor that drives the fan and is attached to the side wall of the scroll via a mounting foot, and an outer periphery at the start of winding of the scroll. In a blower device comprising a nose portion protruding toward the inside of the ventilation passage at a joint between a wall and an inner wall near the discharge port, a rib is provided in a recess formed on the outside of the ventilation passage, which is the back side of the nose portion; A blower device characterized in that the outer circumferential wall forming the nose portion and the inner wall of the discharge port are connected by this rib, and a fixing portion for attaching a motor is disposed on the rib.