JP2000240581A - Drain pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a draining board in a drain pump from moving to a motor side, bringing into contact with a motor bracket and vibrating to cause noise. SOLUTION: A rotary blade 30 is mounted in the housing 20 of a pump body of a drain pump 10, and driven by a driving shaft 60 of a motor 50. A draining board 40 mounted on the driving shaft is disposed between the rotary blade and a collar 100 formed by a disc-shaped flange part and a cylindrical part, a draining disc is raised to a motor side by the flange part for preventing the same from contacting with a motor bracket 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain pump, and more particularly to a drain pump provided in an air conditioner.

[0002]

2. Description of the Related Art In an indoor unit of an air conditioner, moisture in the air condenses and adheres to a heat exchanger during a cooling operation, and drops into a drain pan provided below the heat exchanger. A drain pump is used to drain the drain water accumulated in the drain pan. This drain pump has a suction port formed in a lower part, an upper part is opened, and a blade is rotatably provided in a housing provided with a discharge port on a side. It is rotated by a fixed motor. The drive shaft of the motor is rotatably penetrated through a through hole formed in the cover and is connected to the shaft of the blade. When the motor is driven and the blade rotates, the drain water stored in the drain pan is sucked. It is sucked in from the lower end of the blade of the mouth, is pumped up along the inner surface of the housing by centrifugal force, and is discharged to the outside from the discharge port of the casing.

In such a conventional drain pump, drain water sometimes blows out from a through hole formed in a cover provided above the opening of the housing, and the blown drain water scatters to the motor, resulting in malfunction of the motor. Cause. For this reason, in the conventional drain pump, in order to prevent drain water from blowing out from the through hole of the cover, the drive shaft is provided with a disk-shaped drain plate at a position above the through hole, Drain water is prevented from blowing out.

[0004]

However, in the conventional drain pump, the drain plate sometimes moves to the motor side. In this case, the drain plate comes into contact with the motor bracket, and the peripheral portion of the drain plate moves. There was a problem that it caused vibration and caused noise. In view of this point, the present invention prevents the drain plate from contacting the motor,
An object of the present invention is to provide a drain pump having improved lubrication of a bearing of a drive shaft of a motor.

[0005]

In order to achieve the above object, a drain pump according to the present invention comprises a drain plate on a drive shaft of a motor for driving a rotating blade rotating in a pump housing, wherein the drain plate is provided with: It is provided between the rotary blade and a collar having a disk-shaped flange portion and a cylindrical portion provided on the drive shaft.

A specific embodiment of the drainage pump according to the present invention is characterized in that an end face of the cylindrical portion opposite to the flange portion of the collar forms a bearing surface for bearing lubricating oil of the motor. I have. With such a feature, it is possible to prevent the draining disk from moving to the motor side, and it is possible to realize a lubricating structure for the bearing of the drive shaft of the motor.

[0007]

FIG. 1 is a side view showing a part of a cross section of a drainage pump according to the present invention, and FIG. 2 is an enlarged view of a main part of FIG. The pump body of the drainage pump according to the present invention, which is generally designated by reference numeral 10, has a pump housing composed of a housing 20 and a lid 22, and a rotary blade 30 housed in the pump housing. The housing 20 includes the pump chamber 2
1c, drain water suction port 21a, discharge port 21
b.

A through hole 24 is provided at the center of the lid 22 attached to the upper portion of the housing 20, and a drive shaft 60 of the motor passes through the through hole 24, and the Is inserted into the hole 34.

The motor 50 has a stator 51 disposed on the outside, and a rotor 54 is provided in brackets 52 above and below the motor 50, and drives a drive shaft 60 of the motor to rotate. The drive shaft 60 includes upper and lower motor brackets 52.
Are supported by bearings 70 and 80 provided at two upper and lower positions.

The bearings 70 and 80 are made of, for example, an iron-copper sintered alloy, have a porous structure, and form a bearing having good oil impregnation. Oil-impregnated members 72 and 82 such as felts are inserted outside the bearings 70 and 80,
Upper and lower brackets 5 are formed by ring-shaped springs 74 and 84.
2 are held.

A drive shaft 60 of the motor protrudes from a bracket 52 of the motor, and is pressed into a bottomed hole 34 provided in a shaft 32 of the rotating blade 30 to drive the rotating blade 30. Although the bottomed hole 34 is provided in the shaft 32, a through hole may be used. On the upper surface of the shaft 32, a draining disk 40 made of a thin plastic film is provided with a drive shaft 60 of a motor.
Is mounted in a penetrating configuration.

And, in the drainage pump of the present invention,
A plastic collar 10 is attached to the drive shaft 60 of this motor.
0 is installed in the press fit state. The attachment of the collar 100 to the drive shaft 60 is easy because it is a single part.

As shown in FIG. 2, this collar 100
It has a cylindrical portion 105 and a disk-shaped flange portion 110, and the flange portion 110 is located above the draining disk 40. The flange portion 110 is provided with a draining disc 40 for preventing drain water returning from a discharge pipe (not shown) leaking from the through hole 24 of the lid 22 from splashing toward the motor when the drain pump is stopped. Prevents being pushed up to the motor side. That is, even if the draining disk 40 moves, the draining disk 40 abuts on the flange portion 110 and is prevented from moving to the motor side. Moreover, the draining disc 40
Is larger than the diameter of the flange portion 110, only the center of the draining disk 40 comes into contact with the flange portion 110, and the peripheral portion of the draining disk 40 does not vibrate.

Further, the flange portion 110 is connected to the cylindrical portion 10.
5 is arranged perpendicular to the axis of the motor drive shaft 60, so that the generation of wind noise and the like during rotation is suppressed to a minimum, and does not come into contact with the lid 22 or the motor bracket 52.

Further, an upper end surface 120 of the collar 100,
Forming a lubricating oil reservoir 130 between the bearing 80 and the bearing 80;
It has the function of preventing leakage of lubricating oil. That is,
The upper end surface 120, which is the oil receiving surface, and the bearing 80 are closely opposed to each other, and the gap therebetween is set to about 0.5 mm. When the drive of the motor is started and the drive shaft 60 is supported and rotated by the bearing 80, the temperature of the oil increases and the viscosity decreases,
Oil seeps between the shaft. The oil whose viscosity has decreased is placed on the upper end surface 120 of the cylindrical portion 105, but is held on the upper end surface 120 by surface tension, and the oil reservoir 130
To form

When the motor is stopped, the bearing 80 made of a porous material absorbs oil accumulated on the upper end surface 120 of the cylindrical portion into the bearing 80 by capillary action, and the oil reservoir 130 disappears. By the action of the cylindrical portion, leakage of oil lubricating the bearing of the motor is prevented.

[0017]

As described above, the drain pump according to the present invention is provided with a collar having a disk-shaped flange portion and a cylindrical portion on the outer periphery of a drive shaft penetrating the lid of the pump housing. The movement of the draining disc to the motor side is prevented, so that water drops are prevented from being applied to the motor section.

The upper end surface of the cylindrical portion of the collar constitutes a lubricating oil receiving surface of the bearing of the motor, forms an oil reservoir between the collar and the bearing, and uses the surface tension of the oil to store the oil. Hold. The bearing is made of a sintered alloy or the like, and sucks oil accumulated on an oil receiving surface by using a capillary phenomenon.

[Brief description of the drawings]

FIG. 1 is a side view showing a partial cross section of a drainage pump according to the present invention.

FIG. 2 is an explanatory view showing a main part of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drainage pump 20 Housing 22 Lid part 24 Through-hole 30 Rotating blade 32 Shaft 50 Motor 60 Motor drive shaft 70,80 Bearing 100 Collar 105 Cylindrical part 110 Flange part 120 Oil receiving surface 130 Oil sump part

Continued on the front page F term (reference) 3H022 AA01 BA06 BA07 CA04 CA18 CA36 CA40 CA41 CA43 CA48 CA51 CA56 CA58 CA60 DA04 DA08 DA17

Claims (2)

[Claims] 1. A drain shaft is provided on a drive shaft of a motor for driving a rotary blade rotating in a pump housing, wherein the drain plate is a disk-shaped flange portion and a cylinder provided on the rotary blade and the drive shaft. A drain pump provided between a collar having a portion. 2. The drainage pump according to claim 1, wherein an end surface of the cylindrical portion of the collar opposite to the flange portion forms a bearing surface for bearing lubricating oil of the motor.