JP3996121B2 - Drainage pump - Google Patents

Description

  The present invention relates to a drainage pump, and more particularly to a drainage pump equipped in an air conditioner.

  In the indoor unit of the air conditioner, moisture in the air condenses and adheres to the heat exchanger during cooling operation, and drops into a drain pan provided below the heat exchanger. A drainage pump is provided to drain the drain water accumulated in the drain pan. Various types of drainage pumps have been proposed in the past, and this type of pump is as follows. That is, a motor in which a suction port is formed in the lower portion, an upper portion is opened, and a blade is rotatably provided in a housing provided with a discharge port on a side, and the blade is fixed to the upper portion of the housing opening via a cover. It is rotated by. The rotation shaft of the motor is rotatably connected to the shaft portion of the blade through the cover, and the cover is provided with a through hole that communicates the atmosphere with the housing. As a result, when the motor is driven and the blade rotates, the drain water stored in the drain pan is sucked from the lower end of the blade of the suction port, pumped up along the inner surface of the housing by centrifugal force, and discharged from the discharge port of the casing. It is discharged outside.

Such a conventional drainage pump has a problem that noise is generated when drainage flows and drainage starts. This is because bubbles are generated from the liquid around the blades and the bubbles collide with the blades, the inner surface of the housing, and the like.
The present invention provides a drainage pump that solves the above problems.

Drainage pump of the present invention, the motors, a drainage pump having a rotary vane connected to the drive shaft of the motor, and a housing for accommodating the rotation vane, rotary vane is connected to a drive shaft of a motor A plurality of plate-shaped large-diameter blades extending radially from the outer periphery of the shaft portion, a plate-shaped small-diameter blade formed continuously at the lower edge of the large-diameter blade, and an outer periphery of the large-diameter blade A cylindrical wall member that connects the portions, and an annular member that extends radially inward from the cylindrical wall member along the lower edge of the large-diameter blade, and the cylindrical wall member is formed lower than the large-diameter blade. together are, Ru an inner to an arc-shaped portion of its upper edge.

As described above, the drainage pump of the present invention has a plate-like large-diameter blade, a small-diameter blade, a cylindrical wall member that connects the outer peripheral edge of the large-diameter blade, and the vicinity of the outer peripheral portion of the lower edge portion of the large-diameter blade. It has a rotating blade with a ring part to cover, the height of the upper edge of the cylindrical wall member is set lower than the height of the upper edge of the large-diameter blade, and the flow of bubbles is made smooth. It goes to the discharge port, and noise can be reduced.
Moreover, by providing an arc-shaped chamfered portion at the upper edge of the cylindrical wall member, the flow of bubbles can be made smooth to reduce noise, and a low-noise air conditioner can be obtained.

Furthermore, since the chamfered portion is formed at the lower end portion of the small-diameter blade facing the suction port, the contact with the drain water becomes smooth and noise is reduced.
And the thickness dimension of the resin member which comprises the casing and cover of a pump is increased, and the leak prevention effect to the exterior of a noise is improved.

FIG. 1 is a side view, partly in section, showing the overall configuration of the drainage pump of the present invention.
The drainage pump indicated by reference numeral 1 as a whole has a motor 10 and a pump body 30 attached to the motor 10 via a bracket 20 below. The bracket 20 is formed integrally with a cover 32 that is an upper member of the pump housing, and the cover 32 is connected to the housing 40 via a seal member 34.
The housing 40 is made of plastic and has a suction port 42, a pump chamber 44, and a discharge port 46.

The rotary blade 50 provided in the pump housing 40 includes a shaft portion 52 and a small-diameter blade 54 formed of a plurality of flat plates protruding in the radial direction around the central axis of the shaft portion 52.
In the present embodiment, four small-diameter blades 54 are provided.
The shaft portion 52 protrudes toward the motor 10 through the 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. A draining disk 14 is attached to the upper surface of the shaft portion 52 to prevent the drain water sprayed from the through hole 36 of the cover 32 from scattering to the motor 10 side.

  The small-diameter blade 54 of the rotary blade 50 is inserted into the pipe-like suction port 42 of the pump housing 40. The suction end portion 43 of the suction port 42 is formed in a tapered surface whose inner diameter is reduced toward the opening end, and the tip end portion of the small-diameter blade 54 is also formed in a tapered surface 56. The large-diameter blade 60 of the rotary blade 50 is accommodated in the pump chamber 44 of the pump housing 40.

  2 is a side view of the rotary blade 50, FIG. 3 is a detailed view of a portion B in FIG. 2, FIG. 4 is a top view of the rotary blade 50, and FIGS. 5 (A), (B) and (C) are FIG. It is a figure which shows a part of AA cross section, BB cross section, and CC cross section.

The rotary blade 50 includes a shaft portion 52, a flat plate-like large-diameter blade 60 that extends radially outward from the outer periphery of the shaft portion 52, and a tapered annular member 62 that continues to the lower end portion of the large-diameter blade 60. A continuous small-diameter blade 54. In the present embodiment, the large-diameter blade 60 and the small-diameter blade 54 are integrally formed of resin, and each is four flat plates, but the number of the plates is appropriately selected. Auxiliary blades 68 are provided between the large-diameter blades 60. The pump head can be increased by the auxiliary blade 68.
A hole 53 for inserting a motor drive shaft is provided at the center of the shaft portion 52, and the tip end portion of the small-diameter blade 54 is formed in a tapered surface 56. The inclination angle of the taper surface 56 is, for example, 45 degrees.

  The small-diameter blade 54 is formed with an arc-shaped chamfered portion 57 with respect to the rotation direction. The arc-shaped chamfered portion 57 has a radius of curvature substantially equal to the thickness dimension of the small-diameter blade. By providing the chamfered portion 57, noise due to the stirring of drain water in the suction port 42 is reduced, and the small diameter is reduced. The drain water is smoothly pulled up into the pump chamber 44 by the rotation of the blades 54.

The outer peripheral ends of the large-diameter blade 60 and the auxiliary blade 68 are connected by a cylindrical wall member 64. The cylindrical wall member 64 is provided with a height lower than the height of the upper edge portions of the large-diameter blade 60 and the auxiliary blade 68. In the present embodiment, an arc-shaped chamfered portion 70 is formed inside the upper edge portion of the cylindrical wall member 64.
According to the cylindrical wall member 64, the flow of bubbles generated from the liquid around the large-diameter blade 60 smoothly flows to the discharge port 46, and the collision of the bubbles with the bottom surface 35 of the cover 32 is alleviated and noise is generated. When the drainage pump decreases and the drainage pump stops, the return water returning from the discharge port 46 to the pump chamber 44 in the casing hits the cylindrical wall member 64 and gradually diffuses due to the buffering of the cylindrical wall member 64, resulting from the return water. Noise is also reduced. Moreover, the arc-shaped chamfered portion 70 has a radius of curvature substantially equal to the thickness of the cylindrical wall member 64, for example, and by providing the arc-shaped chamfered portion 70, the large-diameter blade 60 and the auxiliary blade 68 The drain water to which energy flowing in the radial direction by rotation rotates smoothly over the upper edge portion of the cylindrical wall member 64, that is, the flow of the bubbles becomes smooth and heads toward the discharge port 46, so that low noise is achieved. Can be realized.

The lower end portion of the cylindrical wall member 64 is annularly connected to an annular member 62 that connects the lower edge portion of the large-diameter blade 60 and the auxiliary blade 68. In addition, although the case where the cylindrical wall member 64 and the annular member 62 are comprised integrally is shown in the figure, of course in the present invention, they may be constituted separately.
Due to the annular member 62, the level of the drain water rising from the suction port 42 is substantially divided up and down, the amount of water in contact with the large-diameter blade is reduced, and the generation of bubbles is reduced.
The inner peripheral side of the annular member 62 has an opening 63 between the center portion of the rotary blades. The lower edge portions of the large-diameter blade 60 and the auxiliary blade 68 are formed in a shape inclined toward the small-diameter blade 64, and the annular member 62 is also formed in a dish shape in accordance with this inclination.
Furthermore, in this invention, generation | occurrence | production of noise can be suppressed by setting it as 2-4 mm which is the thickness dimension of the housing 40 and the cover 32 which are made of a plastic material.

The side view which shows the drainage pump of this invention in a partial cross section. The side view of a rotary blade. FIG. 3 is a detailed view of part B in FIG. 2. The top view of a rotary blade. Sectional drawing for description of the rotary blade shown in FIG.2 and FIG.4.

Explanation of symbols

DESCRIPTION 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 Rotary blade 54 Small diameter blade 57 Chamfer 60 Large diameter blade 62 Annular member 64 Cylindrical wall member 68 Auxiliary blade 70 Chamfer

Claims (1)

A drainage pump having a motor, a rotary blade connected to the drive shaft of the motor, and a pump housing that houses the rotary blade,
The rotating blade is a flat plate formed continuously from a shaft portion connected to the drive shaft of the motor, a plurality of plate-shaped large-diameter blades extending in the radial direction from the outer periphery of the shaft portion, and a lower edge portion of the large-diameter blade. A small-diameter blade having a cylindrical shape, a cylindrical wall member connecting the outer periphery of the large-diameter blade, and an annular member extending radially inward from the cylindrical wall member along the lower edge of the large-diameter blade, A drainage pump characterized in that the drainage pump is formed lower than the large-diameter blade and has a portion formed in an arc shape inside the upper edge.

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