JPH0979171A - Drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise of a drainage pump by arranging a space in outer peripheral parts of large diameter blades of a rotary blade having platelike large diameter blades and a platelike small diameter blade continuing with these. SOLUTION: A rotary blade 50 has light platelike four large diameter blades 60 projecting in a radial shape from the outer periphery of a motor installing shaft part 52 and a small diameter blade 54 whose diameter is smaller than the large diameter blades 60 composed of plural plates projecting in a radial shape from the outer periphery with a small diameter blade shaft part 55 coaxial with a central shaft of the motor installing shaft part 52 as the center. A ring-shaped space 70 is formed in outer peripheral parts of the large diameter blades 60 of this rotary blade 50. This space 70 is formed by being surrounded by an outside cylindrical wall member 64 to cover the outer periphery of the platelike large diameter blade 60, an annular member 62 extending inside along the upper edge of the large diameter blades 60 from an upper end part of the cylindrical wall member 64 and an inside cylindrical member 66 opposed to the outside cylindrical wall member 64 by extending to the lower side from the inner peripheral end of the annular member 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pump, and more particularly to a drainage pump for draining drain water of an air conditioner or the like.

[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. Further, in the lower part of the blade, it is caused by the turbulence of the water flow of the drain water near the suction port and further by the scratching of the drain water. The present invention provides a drainage pump that solves the above problems.

[0004]

A drainage pump according to the present invention is a drainage pump having a motor, a rotary vane connected to a drive shaft of the motor, and a pump housing for housing the rotary vane. Is a plurality of flat plate-shaped large-diameter blades radially projected from a motor mounting shaft connected to a motor drive shaft, and a plurality of flat plates radially projected from a small-diameter blade shaft coaxial with the motor mounting shaft. A small-diameter blade, and is provided on the outer circumference of the large-diameter blade, and the small-diameter blade shaft portion is formed in a cylindrical shape. The space includes an outer cylindrical wall member that connects the outer peripheral portion of the large-diameter blade, an annular member that extends radially inward from the upper end of the outer cylindrical wall member along the upper edge of the large-diameter blade, and the annular member. And an inner cylindrical wall member extending from the inner peripheral end of the inner cylindrical wall member to face the outer cylindrical wall member. By providing this rotary vane, it is possible to seal the noise generated when the water flow and the bubbles collide with the housing and the vane in the space and reduce the noise.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a cross section of the structure of a drainage pump of 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 integrally formed with a cover 32 that is an upper member of the pump housing, and the cover 32 is connected to the pump housing 40 via a seal member 34. The pump housing 40 is made of resin and has a suction port 42, a pump chamber 44, and a discharge port 46.

The rotary blade 50 installed in the pump housing 40 includes a motor mounting shaft portion 52, four large-diameter blades 60 in a flat plate shape radially protruding from the outer periphery of the shaft portion 52,
A small diameter blade shaft portion 55 coaxial with the central axis of the motor mounting shaft portion 52.
Has a small-diameter blade 54 having a diameter smaller than that of the large-diameter blade 60 formed of a plurality of flat plates radially protruding from the outer periphery of the blade. Thus, the small-diameter blade shaft portion 55 is formed in a cylindrical shape, and the small-diameter blade 54 is formed so as to project on the cylindrical shaft portion 55, as shown in the perspective view of the rotary blade 50 in FIG.
In the embodiment, the case where four small-diameter blades 54 are formed on the cylindrical shaft portion 55 is shown.

The motor mounting shaft portion 52 projects toward the motor 10 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 53 provided in the motor mounting shaft portion 52. It The drain disc 14 is attached to the upper surface of the motor mounting shaft portion 52, and the through hole 36 of the cover 32 is attached.
It is possible to prevent the drain water spouted from the engine from scattering 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 perspective view of the rotary blade 50, FIG. 3 is a bottom view of the rotary blade 50, FIG. 4 is a top view of the rotary blade 50, and FIG.
Is a side view of the rotary blade 50, FIG. 6 is a cross-sectional view taken along line AA of FIG.
7 is a sectional view taken along the line DD of FIG. 4, FIG. 8 is a sectional view taken along the line EE of FIG. 4, and FIG. 9 is a detailed view of the portion F of FIG. The rotary blade 50 is integrally formed of resin, and the number of large-diameter blades 60 is four flat plates.
It is selected appropriately. The number of small-diameter blades 54 is also selected appropriately. The rotary blade 50 having the shape shown in FIG. 2 has a small gap so that the large-diameter blade 60 and the small-diameter blade 54 do not come into contact with the inner surface of the pump housing 40 in the pump chamber 44 and the pipe-shaped suction port 42, respectively. Housed and rotated. Therefore, the pump housing 40 is
It is needless to say that the pipe-shaped suction port 42 and the pump chamber 44 are connected by the curved surface 45, as a matter of course. Moreover, the large-diameter blade 60 of the rotary blade 50
A ring-shaped space 70 is formed on the outer peripheral portion of the.

As shown in detail in the figure, this space 70 is
Outer cylindrical wall member 6 that covers the outer peripheral portion of the large-diameter flat blade 60.
4, an annular member 62 that extends inward from the upper end of the cylindrical portion 64 along the upper edge of the large-diameter blade 60, and extends downward from the inner peripheral end of the annular member 62 and faces the outer cylindrical wall member 64. It is formed so as to be surrounded by the inner cylindrical wall member 66. Rotary blade 5
The small-diameter blade shaft portion 55 of 0 and the tips of the small-diameter blade 54 are formed on the tapered taper surface 56. Auxiliary blades 68 extending inward from the outer cylindrical wall member 64 are provided between the large-diameter blades 60 to assist the pump head capacity.

A ring member 80 is provided at the lower edge of the large-diameter blade 60. The ring member 80 has a hollow portion 72 that vertically penetrates between the inner peripheral portion and the small diameter blade shaft portion 55.
And the slit 74 is also formed between the inner cylindrical wall member 66 and the inner wall. When the air conditioner is operated, the drainage pump 1 having such rotary vanes 50 sucks up the drain water in the drain pan in the indoor unit of the air conditioner from the suction port 42 with the small diameter vanes 54, and pumps the drain water with the large diameter vanes 60. It is smoothly discharged from the discharge port 46 along the curved surface 45 of the chamber 44.

At this time, the space 70 prevents the drain water from splashing to the cover 32 side of the pump housing and seals the noise generated by the contact between the rotary blade 50 and the drain water in the rotary blade. Therefore, the air conditioner can have low noise. In the suction port 42, the drain water sucked up by the small diameter blade 54 is
The suction amount is limited by the cylindrical portion of 5, and the small-diameter blade 5
The water contact area with 4 can be reduced, the turbulence of the drain water flow is reduced, the flow is made uniform, and the noise due to water agitation is reduced.

Further, by forming the tapered surface 56,
The gap with the suction port 42 can be widened, the agitation of water by the lower part of the small diameter blade 54 can be reduced, and the noise can be reduced. When the drainage pump 1 is stopped, the drain water being pumped flows back from the discharge port 46 to the pump chamber 44. The drain water that flows backward hits the outer cylindrical wall member 64 that forms the space 70, and due to the buffering, the pump housing 4 is gradually removed.
As a result, the noise caused by the water flowing backward can be reduced.

The drain water sucked up by the small-diameter blades 54 is divided into substantially vertical liquid surfaces by the ring member 80, and the amount of water in contact with the large-diameter blades 60 is reduced, thereby reducing the generation of bubbles. , Noise is reduced. Regarding the space 70 formed in the large-diameter blade 60, as shown in FIG. 9, the outer cylindrical wall member 64 arranged on the outer peripheral portion of the large-diameter blade and the upper edge portion of the large-diameter blade are arranged. Alternatively, the inner cylindrical wall member 66 may be omitted. Even in this space 70, noise and the like can be sealed in the large-diameter blade, and the noise can be reduced.

[0015]

Since the drainage pump of the present invention is configured as described above, it is provided with the rotary blade having the flat large-diameter blade and the flat small-diameter blade continuous with the large-diameter blade. By providing the space on the outer peripheral portion of the radial blade, it is possible to seal noise generated when the water flow and the bubbles collide with the pump housing and the blade. Moreover, the suction amount of drain water can be limited by the cylindrical small-diameter blade shaft portion, the flow of drain water can be made uniform, and noise can be reduced.
Further, since the tips of the small-diameter blade shaft portion and the small-diameter blade have tapered surfaces, it is possible to reduce noise due to agitation of the amount of drain water.

[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 perspective view of a rotary blade.

FIG. 3 is a bottom view of a rotary blade.

FIG. 4 is a top view of rotary vanes.

FIG. 5 is a side view of a rotary blade.

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

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

FIG. 8 is a sectional view taken along the line EE of FIG. 4;

9 is a detailed view of an F portion 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 55 Small Diameter Blade Shaft 60 Large Diameter Blade 62 Annular Member 64 Outer Cylindrical Wall Member 66 inner cylindrical wall member 70 space 80 ring member

Claims (3)

[Claims] 1. A drainage pump having a motor, a rotary vane connected to a drive shaft of the motor, and a pump housing accommodating the rotary vane, wherein the rotary vane is a motor mounting member connected to the drive shaft of the motor. A plurality of large flat blades radially protruding from the shaft,
A plurality of flat plate-shaped small-diameter blades radially protruding from the small-diameter blade shaft portion coaxial with the motor mounting shaft portion are provided, and a space is provided on the outer circumference of the large-diameter blade blade, and the small-diameter blade shaft portion has a cylindrical shape. The formed space, the outer cylindrical wall member that connects the outer peripheral portion of the large diameter blade, an annular member that extends radially inward from the upper end of the outer cylindrical wall member along the upper edge of the large diameter blade, A drainage pump formed by an inner cylindrical wall member extending from an inner peripheral end of the annular member so as to face the outer cylindrical wall member. 2. The small-diameter blade shaft portion and the small-diameter blade are formed in a tapered shape.
The listed drainage pump. 3. The drainage pump according to claim 1, wherein a ring member is provided at a lower edge portion of the large diameter blade.