JPH08189496A - Motor for blower - Google Patents

Abstract

PURPOSE: To eliminate disadvantage such as entering of moisture contained in air and entering of dusts into a bearing of a motor. CONSTITUTION: A rotary shaft 5 of a motor 4 is faced into a casing of a blower, which shaft 5 is projected from a motor casing 4a through a bearing 4f arranged in the motor casing 4a of the motor 4 which drives the blower, while a blade of the blower is mounted thereon. A circular space 7 around the rotary shaft 5 is formed outside the bearing 4f of the motor casing 4a of the motor 4. An outer peripheral part of a disc 8 provided on the rotary shaft 5 is inserted into the space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor for driving a blower mainly used for sending combustion air.

[0002]

2. Description of the Related Art Heretofore, there has been known one in which a motor for driving the blades of a blower is supported by a casing of the blower. In this case, a part of the blown air leaks from an insertion hole for inserting the rotation shaft of the motor provided in the casing of the blower. If there is such a leak, when the fuel is supplied while the fuel supply amount and the combustion air are balanced for combustion, as in a combustor of a type capable of adjusting the combustion amount, the balance may be lost and incomplete combustion may occur.

[0003]

Therefore, the insertion hole is closed with a motor casing. However, in this case, the air from the insertion hole flows to the bearing portion of the motor, and when the bearing portion, for example, the ball bearing is used due to the moisture contained in the air, the race or the ball may be rusted, This may cause dust to get into the bearing and cause noise to be generated. It is an object of the present invention to provide a blower motor that solves such a problem.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a motor for driving a blower, in which a rotating shaft of the motor is protruded from the motor casing through a bearing portion provided in the motor casing. In a blower motor that faces the inside of the casing and has the blades of the blower attached thereto, a circular space surrounding the rotary shaft and having the rotary shaft as a center is provided outside the bearing portion of the motor casing, An outer peripheral portion of a disk-shaped disc provided on the rotating shaft is inserted into the space.

[0005]

In the blower motor having the above structure,
Since a circular space surrounding the rotary shaft and having the rotary shaft as a center is provided outside the bearing portion of the motor casing, a disk-shaped disk protruding from the rotary shaft is inserted into the space.
The disc-shaped disc prevents the air flowing from the blower to the bearing portion side of the motor casing, and the disc-shaped disc blocks the outer periphery of the disc because the outer periphery of the disc is inserted into the space. It does not flow through to the bearing portion side of the motor casing.

[0006]

EXAMPLE One example of the present invention will be described when it is applied to a combustor using kerosene as a fuel. In the drawing, reference numeral 1 denotes a combustor, and the illustrated combustor 1 is composed of a pot burner including a combustion pot 1a, an air chamber 1b surrounding the combustion pot 1a, and a combustion chamber 1c provided above the combustion pot 1a. Reference numeral 2 denotes an air supply / exhaust cylinder having an air supply / exhaust top 2a, and 3 denotes a blower classified as a fan for forcibly supplying air to the combustor 1 interposed in the air supply / exhaust cylinder 2. The blower 3 has a drive motor 4 on one side of its casing 3a, as is apparent from FIGS.
And a rotary shaft 5 of the motor 4, a bearing portion 4f provided in the motor casing 4a, and a casing 3 of the blower 3.
The casing 3 of the blower 3 through the insertion hole 3f provided in a.
The blade 3b was attached to the rotary shaft 5 facing the casing 3a. To further explain this, the blower 3
Inside the casing 3a, fixed blades 3c fixed to the casing 3a are provided, and the blades 3b, 3b are attached to the rotary shaft 5 so that the rearward facing blades 3b facing both sides of the fixed blade 3c are faced, And the casing 3 of the blower 3
It is configured as a single-suction type in which a suction port 3d is provided at the center of one side of a, and the suction port 3d is connected to the intake pipe 2b of the air supply / exhaust pipe 2 and the discharge provided on the lower side of the blower casing 3a. The outlet 3e is connected to the ventilation passage 1d provided in the combustor 1 to supply air to the air chamber 1b, and the combustion chamber 1c is connected to the exhaust pipe 2c of the air supply / exhaust pipe 2 to exhaust the air. The blade 3b is attached to the rotary shaft 5 by providing a step portion 5b on the rotary shaft 5, a screw portion at the tip of the rotary shaft 5, and a nut 5d screwed to the step portion 5b and the screw portion. Between both wings 3
Install by fixing b and 3b. 5c has both blades 3
The bush interposed between b and 3b is shown.

The motor casing 4a is formed by stacking a pair of cup-shaped frame members 4a-1 and 4a-1 on the opening side, and the side plates of the motor casing 4a are once recessed and then extend outwardly. As a shape, in the center of the side plate, a bearing ring insertion portion 4d having a tubular portion 4b and a flat plate portion 4c on the outer side thereof is formed. The rotating shaft 5 is supported by the bearings 4f and 4f, and the one bearing 4f, that is, the bearing 4f on the side facing the blower 1 is formed.
A cap 6 is fitted around the outer periphery of the motor casing 4
A circular space 7 that surrounds the rotary shaft 5 and is narrow along the circumferential direction of the rotary shaft 5 is formed between the outer periphery of a, that is, between the flat plate portion 4c and the cap 6, and the rotary shaft 5 is provided in the space 7. The outer peripheral portion of a resin disk 8 made of a circular fluororesin (Teflon) or the like protruding from the side was inserted. Assembling of this device is performed by placing the disk 8 attached to the rotary shaft 5 along the outside of the flat plate portion 4c, and then fitting the cap 6 on the outer periphery of the bearing portion 4f.
As shown in FIG. 3, the outer peripheral portion of the disk 8 is inserted into the space 7 formed between the flat plate portion 4c and the cap 6.

The disk 8 is provided by being fitted in a groove 5a formed on the circumferential surface of the rotary shaft 5 and extending in the circumferential direction. However, this may be provided by being loosely fitted in the groove 5a, or may be integrally bound to the outer circumference of the rotary shaft 5. Also,
A packing 9 is interposed at the mounting portion of the motor 4 to the casing 3a so as to prevent air leakage from the insertion hole 3f of the casing 3a. It should be noted that when the space 7 is filled with grease, the air blower 1 can be further removed from the motor casing 4a
The wind that flows toward the bearing portion 4f side can be blocked. Reference numeral 10 denotes a tachometer for detecting the rotation speed of the motor 4.

[0009]

According to the present invention, a circular space surrounding the rotary shaft is provided outside the bearing portion, and a disc-shaped disk protruding from the rotary shaft side is inserted in the space, so that the casing of the blower is installed. There is an effect that a part of the blown air can be prevented from acting on the bearing portion of the motor through the provided insertion hole, and the above-mentioned problems associated therewith can be eliminated.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a bottom view showing the half of FIG. 1 removed.

FIG. 3 is a cutaway side view of a main part of FIG.

FIG. 4 is a side view showing a usage state.

[Explanation of symbols]

1 Combustor 7 Space 2 Air Supply / Exhaust Cylinder 8 Disk 3 Blower 1a Casing 4 Motor 3c Blade 5 Rotating Shaft 4a Motor Casing 4f Bearing

Claims (1)

[Claims] 1. A rotating shaft of a motor, which projects from a motor casing via a bearing portion provided in a motor casing of a motor for driving the blower, is faced in the casing of the blower, and blades of the blower are attached thereto. In the blower motor described above, a circular space surrounding the rotary shaft and having the rotary shaft as a center is provided outside the bearing portion of the motor casing, and the outer peripheral portion of the disk-shaped disc provided on the rotary shaft is provided. A fan motor characterized by being inserted into the space.