JPH0953591A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shield and reduce noise by providing rotary blades having flat- plate-shaped large diameter blades and flat-plate-shaped small diameter blades being continuous to the large diameter blades, and by providing this rotary blades with a space in the outer circumferential part of the large diameter blades. SOLUTION: A rotary blade 50 is provided with a shaft part 52, flat-plate shaped large diameter blades 60 radially extending outward from the outer circumferential part of the shaft part 52, and small diameter blades 54 being continuous to the lower end parts of the large diameter blades 60 through the upper peripheral parts of the taper surface. In the outer circumferential part of the large diameter blades 60, a ring-shaped closed space 70 is formed. This space 70 prevents the drain water from being scattered toward the cover 32 side of the pump housing, and also shields the noise caused by the contact of drain water with the rotary blade 50 from being leaked to the outside. The drainage pump 1 equipped with such blades 50, 54, 60 shields the noise caused by bubbles by means of the formed space 70, so that the noise can be reduced.

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 provided to drain the drain water accumulated in the drain pan. Various drain pumps have been proposed in the past, and the following pumps are of this type. That is, a motor in which a suction port is formed in a lower portion, an upper portion is opened, and a blade is rotatably provided in a housing having a discharge port on a side, and the blade is fixed to an upper portion of the opening of the housing via a cover. It is rotated by. The rotating shaft of the motor is rotatably penetrated through the cover and connected to the shaft of the blade, and the cover is provided with a through hole for communicating the atmosphere with the housing. Thus, when the motor is driven to rotate the blades, the drain water stored in the drain pan is sucked from the lower end of the blade at the suction port, is pumped up along the inner surface of the housing by centrifugal force, and is discharged from the discharge port of the casing. It is discharged outside.

[0003]

The above conventional drainage pump has a problem that noise is generated when drain water flows in and drainage starts. This is based on the fact that bubbles are generated from the inside of the liquid around the blades and the bubbles collide with the blades and the inner surface of the housing. The present invention provides a drainage pump that solves the above problems.

[0004]

A drainage pump having a motor used in the drainage pump of the present invention, a rotary vane connected to a drive shaft of the motor, and a pump housing containing the rotary vane. The blade includes a shaft portion connected to the drive shaft of the motor, a plurality of flat-plate large-diameter blades extending radially from the outer periphery of the shaft portion, and a flat-plate small-diameter blade formed continuously with the large-diameter blade. An outer cylindrical wall member that connects the outer peripheral portion of the large-diameter blade, and an annular shape that extends inward in the radial direction from the upper end portion of the outer cylindrical wall member along the upper edge of the large-diameter blade and continuously with the cylindrical wall member. A space formed by the member and an inner cylindrical wall member that extends from the inner peripheral end of the annular member and is continuous with the annular member and faces the outer cylindrical wall member is provided.
Further, the rotary blade includes a shaft portion connected to the drive shaft of the motor, a plurality of flat plate-shaped large-diameter blades extending radially from the outer periphery of the shaft portion, and a flat plate-shaped member continuously formed with the large-diameter blade. Formed by an outer cylindrical wall member that connects the outer peripheral portion of the large diameter blade and an annular member that extends radially inward from the upper end portion of the outer cylindrical wall member along the upper edge of the large diameter blade. The space may be provided.

[0005]

In the drainage pump provided with such blades, the space formed by the members shields the noise generated by the bubbles and reduces the noise.

[0006]

FIG. 1 is a side view, partially in section, showing the entire structure of a drainage pump according to the present invention. The drain pump generally designated by reference numeral 1 has a motor 10 and a pump main body 30 that is mounted below the motor 10 via a bracket 20. The bracket 20 is formed integrally with a cover 32 that is an upper member of the pump housing, and the cover 32 is provided with a seal member 34 between the housing 32 and the housing 4.
It is connected to 0. The housing 40 is made of plastic and includes a suction port 42, a pump chamber 44, and a discharge port 4.
6.

The rotary vane 50 provided in the pump housing 40 has a shaft portion 52 and a small diameter vane 54 formed of a plurality of flat plates projecting in the radial direction around the central axis of the shaft portion 52. In this embodiment, there are four small-diameter blades 54. The shaft portion 52 projects toward the motor 10 side through a through hole 36 formed in the center of the cover 32, and the drive shaft 12 of the motor 10 is inserted into the hole provided in the shaft portion 52. Shaft 52
A drainage disc 14 is attached to the upper surface of the so as to prevent the drain water ejected from the through hole 36 of the cover 32 from splashing to the motor 10 side.

The small-diameter blade 54 of the rotary blade 50 is inserted into the pipe-shaped suction port 42 of the pump housing 40.
The suction end 43 of the suction port 42 is formed on a tapered surface whose inner diameter is narrowed toward the opening end, and the small-diameter blade 54
Is also formed on a tapered tapered surface 56. In the pump chamber 44 of the pump housing 40, a rotating blade 50 is provided.
Are accommodated.

2 is a side view of the rotary blade 50, FIG. 3 is a top view, FIG. 4 is a bottom view, FIG. 5 is a sectional view taken along line AA of FIG. 3, and FIG. 6 is a sectional view taken along line DD of FIG. 7 is a sectional view taken along line EE of FIG.
7 is a detailed view of the F section of FIG. 7, and FIG. 9 is a detailed view of the F section of FIG. 7, showing another configuration example.

The rotary blade 50 includes a shaft portion 52 and a large flat blade blade 60 extending radially outward from an outer peripheral portion of the shaft portion 52.
And a small-diameter blade 54 continuous to the lower end of the large-diameter blade 60 via a tapered surface 57. In this embodiment, the large-diameter blades 60 and the small-diameter blades 54 are integrally formed of resin and each have four flat plates, but the number is appropriately selected. A hole 53 for inserting a motor drive shaft is provided in the center of the shaft portion 52, and a small-diameter blade 54 is provided.
The front end portion of is formed in a tapered taper surface 56. The inclination angle of the tapered surface 56 is, for example, 60 degrees.

A ring-shaped closed space 70 is formed on the outer peripheral portion of the large-diameter blade 60. The space 70 is provided to prevent the drain water from splashing to the cover 32 side of the pump housing and to shield the noise generated by the contact between the rotary vanes 50 and the drain water from leaking to the outside. Is.

As shown in detail in FIG.
Is the outer cylindrical wall member 64 that covers the outer peripheral portion of the flat-plate large-diameter blade 60, and the large-diameter blade 6 from the upper end of the cylindrical wall member 64.
An annular member 62 that extends inward continuously with the cylindrical wall member 64 along the upper edge of 0, and extends downward from the inner peripheral end of the annular member 62 continuously with the annular member 62 to the outer cylindrical wall member 64. It is formed so as to be surrounded by the inner cylindrical wall member 66 facing each other. Auxiliary vanes 68 extending inward from the outer cylindrical wall member 64 are provided between the large-diameter vanes 60 to assist the drain water lifting capacity. The drain water to which energy is applied by the rotation of the rotary vanes 50 is smoothly pumped from the suction port 42 to the suction port 46 side along the tapered surface 45 of the pump chamber 44. The noise generated by the bubbles around the large-diameter blade 60 is
Is shielded by and noise is reduced.

In FIG. 9, a space 70 is formed by an outer cylindrical wall member 64 arranged on the outer peripheral portion of the large-diameter blade and an annular member 62 arranged on the upper edge of the large-diameter blade. 66 is omitted. As a result, it is possible to prevent dust, for example, fibrous dust, from being clogged in the space 70 as a drain foreign matter, and to be deposited and accumulated, and to shield noise.

[0014]

As described above, the drainage pump of the present invention is provided with the rotary blade having the large flat blade and the small flat blade continuous with the large blade. By providing a space in the outer peripheral portion, noise can be shielded and noise can be reduced.

[Brief description of drawings]

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

FIG. 2 is a side view of a rotating blade.

FIG. 3 is a top view of rotary vanes.

FIG. 4 is a bottom view of a rotary blade.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line DD of FIG.

7 is a sectional view taken along line EE of FIG.

FIG. 8 is a detailed view of part F in FIG.

9 is a detailed view showing another configuration example of the F section of FIG.

[Explanation of symbols]

 1 Drain Pump 10 Motor 20 Bracket 30 Pump Main Body 32 Cover 36 Through Hole 40 Pump Housing 42 Suction Port 44 Pump Chamber 46 Discharge Port 50 Rotating Blade 54 Small Diameter Blade 60 Large Diameter Blade 62 Annular Member 64 Outer Cylindrical Wall Member 66 Inner Cylindrical Wall Member 70 space

Claims (2)

[Claims] 1. A drainage pump having a motor, a rotary vane connected to a drive shaft of the motor, and a pump housing containing the rotary vane, wherein the rotary vane is a shaft portion connected to the drive shaft of the motor. And a plurality of flat plate-shaped large-diameter blades extending in the radial direction from the outer periphery of the shaft portion,
An outer cylindrical wall member that is connected to the outer peripheral portion of the large-diameter blade, and an upper end of the outer cylindrical wall member that is provided with a flat-plate small-diameter blade that is formed continuously with the large-diameter blade. A drainage pump having a space formed by an annular member extending radially inward from the portion and an inner cylindrical wall member extending from an inner peripheral end of the annular member so as to face the outer cylindrical member. 2. A drainage pump having a motor, a rotary vane connected to a drive shaft of the motor, and a pump housing containing the rotary vane, wherein the rotary vane is a shaft portion connected to the drive shaft of the motor. And a plurality of flat plate-shaped large-diameter blades extending in the radial direction from the outer periphery of the shaft portion,
An outer cylindrical wall member that is connected to the outer peripheral portion of the large-diameter blade, and an upper end of the outer cylindrical wall member that is provided with a flat-plate small-diameter blade that is formed continuously with the large-diameter blade. A drainage pump provided with a space formed by an annular member extending radially inward from the portion.