JPH08312591A - Casing structure of motor built-in type blower - Google Patents

Abstract

PURPOSE: To provide a casing structure capable of improving the structure of a casing side plate of a motor built-in type blower and preventing infiltration of water drops or the like into the interior of a motor or a control circuit part. CONSTITUTION: An eaves part 1d to receive water drops infiltrating from a blow-off port along a side plate 1b is formed above a motor on the blow-off port side of the side plate 1b mounting the stator side of the motor of a casing 1. Even if the water drops infiltrate from the blow-off port and move downward along the side plate 1b, the water drops are caught by a 'eaves part' of a bent part formed in an opening part of the casing 1 and thereafter are moved downward along the bent part 1d, so that the water drops can be prevented from infiltrating into a board 16 of a motor built-in blower.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower used for an indoor unit of an air conditioner, for example, and more specifically, a blower drive motor is built in the blower to reduce the number of parts and weight. The present invention relates to a casing structure of a blower with a built-in motor that can be achieved.

[0002]

2. Description of the Related Art Currently, various blowers are used in air conditioners, range hoods, window fans, circulation, air purifiers and the like. These blowers
Since the blower fan and the motor for driving the fan are constructed and assembled separately, the motor part is projected from the fan, or the motor is housed to house the motor provided so as to project from the fan. Since it was necessary to provide a space for use inside the fan casing, it was difficult to downsize the blower. Furthermore, in the blower device in which the motor is protruding from the blower,
When attempting to mount the electric device as described above, the motor part may interfere with other devices, which makes it impossible to make the electric device compact.

In order to solve these problems, Japanese Patent Laid-Open No.
The so-called blower with a built-in motor, as shown in Japanese Patent No. 248393 (shown in FIG. 4), has been proposed. The built-in motor is formed at the center of the ventilation passage formed by the resin casing 100, and the rotary shaft 10 is provided through a plurality of mounting legs 101 extending from the casing at substantially the center of the ventilation passage.
A shaft supporting portion 103 that rotatably supports 2 is provided, a stator 104 is arranged on the outer periphery of the shaft supporting portion 103, and a rotor 105 is arranged outside the stator 104. The rotor 105 of this motor is internally fitted to the blade boss 106 of the impeller fitted to the rotary shaft at the boss. The impeller is formed of a plastic molding, and the impeller covers one side portion of the motor in the axial direction and the outer peripheral portion of the rotor, is integrated with the rotating shaft and the rotor, and rotates together with these.
In this motor built-in type air blower, a board 107 that constitutes an electronic circuit for inputting and outputting to and from the motor is assembled in the motor, and a lead wire for supplying power is directly connected to the circuit board via a connector 108. 109 is connected and drawn out.

[0004]

However, when the above air blower is attached to the burner portion of, for example, a gas water heater, the blower blower is often arranged upward as shown in FIG. Therefore, water droplets generated by gas combustion may enter the casing through the outlet.If water droplets enter the motor through the outlet, they will travel along the side plate and enter the motor or the control circuit. There was a problem such as a failure of the motor.

Therefore, in order to solve the above problems, the present invention improves the structure of the side plate of the casing of a blower with a built-in motor, and can prevent water droplets or the like from entering the inside of the motor or the control circuit section. An object is to provide a casing structure.

[0006]

Therefore, the technical solution adopted by the present invention is to fix the stator core 13 to the outer periphery of the cylindrical bearing housing 9 and to rotate it through the bearing 8 in the inner diameter portion of the bearing housing. A casing for housing a blower with a built-in motor, which supports a child-side shaft 5, and further includes a fan plate 3 of a fan having a magnet 4 attached to the rotor shaft 5 corresponding to the stator core. The eaves portion 1d for receiving the water droplets that have entered from the outlet through the outlet plate above the motor on the outlet side of the side plate to which the stator side is attached.
Is formed.

[0007]

When the water droplets enter the casing through the outlet 30 and travel down the side plate 1b, the water droplets
The bent portion 1d formed in the opening of the casing receives the “eave portion”, and then moves downward along the bent portion 1d, so that water droplets can be prevented from entering the control circuit portion of the blower with a built-in motor.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a casing of a blower with a built-in motor according to an embodiment of the present invention, FIG. 2 is a sectional view showing a state where a blower with a built-in motor is assembled in the casing, and FIG. 3 is a side sectional view of the casing.

In FIG. 1 and FIG. 2, reference numeral 1 is a casing of a blower, and this casing 1 is fixed to the guide wall 1a forming a scroll, and fixed to the guide wall 1a by appropriate fixing means such as caulking which are arranged on both sides of the guide wall 1a. And a side plate 1b that has been formed. A bell mouth 1c is formed in the central portion of one side plate 1b of the casing, and a motor plate 15 of a blower with a built-in motor described later is formed in the central portion of the other side plate 1b.
An opening 20 for attaching the screw is formed with a screw 18 or the like. An outlet 30 is formed in the casing.

Water droplets that have penetrated from the outlet (from the right in the figure) to the approximately half side (right half in FIG. 1) of the opening 20 close to the outlet 30 side are transmitted along the side plate 1b to the built-in motor. An eaves portion (bent portion) 1d for preventing the intrusion into the control circuit portion is formed by burring. That is, as shown in FIG. 3, the water droplets penetrating from the outlet 30 and traveling down the side plate 1b and falling downward are caught by the bent portion 1d formed on the side plate 1b, and thereafter, downward along the bent portion 1d. Moving. Therefore, it is possible to prevent water droplets from entering the control circuit and the inside of the blower with a built-in motor. The guide wall 1a and the side plate 1b are each formed by pressing a metal plate in this embodiment. Further, the eaves portion 1d can achieve the same effect even if it is formed over the entire circumference of the opening portion 20 or in an appropriate range capable of receiving water droplets from the outlet.

The blower with a built-in motor housed in the casing is of the DC brushless outer rotor type, and will be described as a type capable of three-phase bipolar operation. This blower is equipped with a fan formed by attaching a blade plate 2 formed by press-forming a large number of metal plates on the circumference between two fan plates 3, 3 formed by press-molding a metal plate. As shown in FIG. 2, the center of one of them is largely squeezed into a cylindrical shape inward. A magnet (ferrite or the like) 4 positioned at a predetermined position is fixed to the cylindrical inner circumference formed on the fan plate 3 by an appropriate fixing means such as adhesion, and the cylindrical bottom portion is shown in FIG. The boss 6 fixed to the end of the rotor shaft 5 is fixed by the caulking 7.

The rotor shaft 5 is rotatably mounted on bearings 8 and 8 which are fixed to the inner peripheral surface of a cylindrical bearing housing 9, and the bearings 8 and 8 are arranged on the inner periphery of the bearing housing 9, respectively. It is positioned and fixed to a large-diameter step formed on the opening side of both ends of the surface. Further, the rotor shaft 5 penetrates the bearing 8 and is a protruding portion, and is prevented from coming off from a retaining ring (snap ring, clip or the like) 12 via a washer. By adopting such an assembling method using a retaining ring or the like, it is possible to assemble from one direction, and the assembling work can be facilitated.

A small-diameter step portion is formed at the end portion of the bearing housing 9 on the boss 6 side, and the stator core 13 is fixed to the small-diameter step portion. The stator core 13 is formed by laminating silicon steel plates, and a coil is wound around the stator core 13 via an insulating material as is well known.
Similar to the method of fixing the boss 6 and the fan plate, the stator core 13 may be fixed to the bearing housing 9 by caulking on the bearing housing side, or may be fixed to the bearing housing by an appropriate fixing means such as adhesion.

The other end of the housing 9 is
It is fixed to the motor plate 15 by caulking 14. A substrate 16 incorporating a circuit for controlling the operating state of the motor is attached to the inner surface of the motor plate 15 formed by press-molding a metal plate, and the bearing housing 9 also has a function of centering the substrate 16. As a result, the precision of the mounting position of the Hall element or the like on the substrate 16 can be ensured. Here, the substrate is paper phenolic resin.

The motor plate 15 is fixed with screws 18 and the like.
It is fixed to the central portion of the side plate 1b of the casing, and a lead wire (not shown) for supplying a current to the substrate 16 is attached to the outer surface side of the motor plate 15. A dust-proof cover 19 (not shown) can be attached to the outside of the motor plate 15 with a screw 18 that is also used as a motor plate fixing screw, and the cover is provided with a lead wire clamper. Has been. The dust-proof cover can be detached and used if necessary, and is made of synthetic resin or the like.

The assembled state of the blower with a built-in motor having the above structure will be described with reference to FIG. The bearing housing 9 to which the bearing 8 and the stator core 13 are fixed is fixed by caulking 14 to the motor plate 15 to which the substrate 16 is attached. The magnet 4 is fixed to the cylindrical inner peripheral surface formed on the fan plate 3 of the blower, and the boss 6 fixed to the end of the rotor shaft 5 is fixed to the cylindrical center by caulking.

A retaining ring (snap ring, clip or the like) 12 is mounted in the bearing 8 through the washer at the projecting portion through the rotor shaft 5 fixed to the fan plate 3 of the blower. The air blower with a built-in motor assembled as described above is housed in the casing 1, and the motor plate 15 is attached to the casing side plate 1b with the screw 18 or the like, whereby the assembly of the air blower with a built-in motor is completed. Thereafter, a dustproof cover is attached to the outside of the motor plate 15 with screws 18 as needed.

In the air blower configured as described above, water droplets enter the casing through the outlet 30 and the side plate 1b.
Even if the water droplets move downward along the path, the water droplets are received by the eaves portion 1d “folding portion” formed in the opening of the casing, and thereafter move downward along the bending portion 1d as shown in FIG. Therefore, it is possible to prevent water droplets from entering the control circuit unit of the blower with a built-in motor.

In the above embodiment, an explanation was given of an example in which the opening of the side plate is bent to form the eaves portion in the air blower in which the motor plate of the blower with a built-in motor is attached to the side plate, but the motor plate and the side plate are integrated. The eaves may be attached to the upper half of the side plate on the outlet side so that a water drop can be prevented from moving downward by attaching another "eave" corresponding to the bent portion. In addition, the present invention can be implemented in various other forms without departing from the spirit or main characteristics of the present invention. Therefore, the above-described embodiments are merely exemplifications in all respects, and should not be construed as limiting. I won't.

[0020]

As described in detail above, according to the blower with a built-in motor according to the present invention and the blower in which the blower is housed in the casing, the blower is attached with the blow-out port of the blower facing upward. Even if water drops intrude through the mouth, when the water drops travel down the side plate and move downward, the eaves formed on the opening catch the water drops and transmit them to the bent part to move them downward. It is possible to prevent water droplets from entering the motor substrate, and it is possible to achieve an excellent effect such that the risk of motor damage can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a motor-incorporated (centrifugal) blower according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a side sectional view of a casing.

FIG. 4 is a sectional view of a conventional air blower with a built-in motor.

FIG. 5 is a schematic view of a state where a conventional air blower with a built-in motor is attached to a gas burner.

[Explanation of symbols]

 1 Casing 1a Guide plate 1b Side plate 1c Bell mouth 1d Eaves part (folded part) 2 Blade plate 3 Fan plate 4 Magnet 5 Rotor shaft 6 Boss 8 Bearing 9 Bearing housing 13 Stator core 14 Caulking part 15 Motor plate 16 Board 20 Opening part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Endo 2-499 Aioicho Kiryu-shi Gunma Akaishi Metal Industry Co., Ltd.

Claims (2)

[Claims] 1. A stator core 13 is fixed to the outer periphery of a cylindrical bearing housing 9, and a rotor side shaft 5 is supported by an inner diameter portion of the bearing housing via a bearing 8.
Further, a casing for accommodating a blower with a built-in motor, which is provided with a fan plate 3 of a fan having a magnet 4 attached to the rotor shaft 5 corresponding to the stator core, and a side plate to which a stator side of the motor is attached. A casing structure for a blower with a built-in motor, characterized in that an eaves portion 1d for receiving a water droplet that has entered through the same side plate from the outlet is formed on the outlet side of the motor. 2. The casing structure for a fan with a built-in motor according to claim 1, wherein the eaves portion is formed by burring a side plate around an opening for attaching a motor plate.