JP2005030261A - Drain pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve compactness and light weight of a drain pump installed on an air conditioner or the like. <P>SOLUTION: This drain pump 1 comprises a pump housing 40 having a suction port 42, a pump chamber 44, and a delivery port 46, and a cover 32. A rotary blade 50 inside is driven by a motor 10. The rotary blade 50 comprises a shaft part 52 to be installed on a motor output shaft, a flat blade 60 radially extended from a shaft part 53, and a projected part 54 formed on the shaft part 53 that is continuous with the shaft part 52 under the flat blade 60. Suction quantity of drain water sucked from the suction port is thus regulated, and contact area between drain water and the rotary blade 50 becomes smaller. Compactness and light weight of the drain pump are achieved, and noise is reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drainage pump, and more particularly to a drainage pump equipped in an air conditioner.
[0002]
[Prior art]
In the indoor unit of the air conditioner, moisture in the air condenses and adheres to the heat exchanger during the 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 an example of this type of pump is described in Patent Document 1. That is, a suction port is formed in the lower part, an upper part is opened, and a rotary blade is rotatably provided in a housing provided with a discharge port on the side, and the blade is fixed to the upper part of the opening of the housing through a cover. It is rotated by a motor.
[0003]
The rotation shaft of the motor is rotatably connected to the shaft portion of the rotary 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 rotating blades are driven by driving the motor, the drain water stored in the drain pan is sucked in from the lower end of the suction port blades, 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.
[0004]
[Patent Document 1] Japanese Patent Laid-Open No. 8-189622
[Problems to be solved by the invention]
Since this type of drainage pump is installed in an indoor unit of an air conditioner, it is desired to reduce the size and weight. However, conventional drainage pumps have not been designed to reduce the size and weight of the motor and to reduce noise by regulating the amount of drain water sucked.
[0006]
In view of this point, the present invention regulates the amount of fluid sucked from the suction port, thereby reducing the contact area of the fluid with the rotating blades and reducing the load on the rotating blades, thereby It aims at providing the drainage pump which realized miniaturization and weight reduction. It is another object of the present invention to provide a drain pump that regulates the amount of fluid suction and reduces noise.
[0007]
[Means for Solving the Problems]
In order to achieve such an object, the drainage pump according to the present invention is:
The rotary body includes a pump body having a suction port at a lower end and a discharge port on an upper surface, a rotating rotator that is rotatably housed in the pump body, and a motor that rotates the rotator. The shaft portion connected to the output shaft of the motor, the plate-like blades provided radially from the shaft portion, and the shape projecting around the shaft portion connected below the shaft portion is the output shaft direction. And a disk-like member having an opening provided between the protrusion and the blade, and a wall member that connects the outer peripheral edges of the plate-like blade. It is characterized by.
Further, the blade and the projecting portion are disposed on a plane including the axis of the shaft portion, and the disk-shaped member is disposed on a plane orthogonal to the axis.
[0008]
According to this feature, since the protruding portion is located at the suction port, the amount of drain water sucked from the suction port is restricted, the contact area between the drain water and the protruding portion is reduced, and the rotating blade The drainage pump equipped with a motor that is reduced in size and weight can be realized. Further, since the amount of drain water sucked is restricted, a drainage pump with reduced noise can be realized.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1 is a side view, partly in section, showing the overall configuration of the drainage pump of the present invention, FIG. 2 is a side view of a rotary blade, FIG. 3 is a plan view, and FIG. 4 is a bottom view seen from the direction of the arrow in FIG. FIG. 5 is an enlarged view of a portion A in FIG. 4, and FIG. 6 is a cross-sectional view showing an essential part thereof.
[0010]
First, the overall configuration of the drainage pump will be described.
The drainage pump generally indicated by reference numeral 1 includes a motor 10 and a pump body 30 attached to the motor 10 below via a bracket (not shown). The plastic cover 32 is connected to a pump housing 40 constituting the pump body 30 via a seal member 34. The pump housing 40 constituting the pump body 30 is made of resin, and the pump body 30 has a bottom surface 32b formed with a curved surface whose diameter gradually increases, and is formed so as to rise continuously from the bottom surface 32b. A pump chamber 44 constituted by a cylindrical pump housing 40 having a wall 32a, a suction pipe 43 forming a suction port 42 provided at the center lower portion of the pump chamber 44, and an upper portion of the pump chamber 44 extending in the horizontal direction. And a discharge pipe 45 forming a discharge port 46.
[0011]
Next, the rotary blade 50 will be described.
The output shaft 12 of the motor 10 mounted on the upper portion of the cover 32 is connected to the shaft portion 52 of the rotary blade 50 disposed in the pump chamber, and a predetermined gap 36 is provided between the shaft portion 52 and the cover 32. ing.
The rotary blade 50 is made of resin, and as shown in FIG. 2, a shaft portion 52 having a hole 52a for inserting the motor output shaft 12, and a plate-like blade 60 provided radially from the shaft portion 52. A disk-shaped member 62 attached to the lower edge of the blade 60 so as to restrict and restrict a flow from the suction side to the discharge side, and a lower portion of the blade 60 via the disk-shaped member 62 And a projecting portion 54 formed in the output shaft direction in a shape protruding around the shaft portion 53 connected to the shaft portion 52.
[0012]
In the present embodiment, the shaft portion 53 and the shaft 52 have substantially the same diameter, and the diameter φc formed by the shaft portion 53 and the protruding portion 54 shown in FIG. 5 is, for example, about 8 mm. When set, the diameter φa of the shaft portion 53 is set to a range of about 5 mm to 7 mm, and the height b of the protruding portion 54 is set to a range of about 1.5 mm to about 0.5 mm. In this range, the size of φa and the height b of the projection 54 may be selected as appropriate. Therefore, for example, if φa is about 5 mm, the height b of the projecting portion 54 is selected to be about 1.5 mm. The width of the protrusion 54 can be variously selected, but in the present embodiment, it is about 1.5 mm (circumferential length). In general, the larger the length, the smaller the suction amount. Therefore, the suction amount can be adjusted by this length.
[0013]
A resin draining disk 14 is attached above the shaft portion 52 to prevent the drain water flowing out from the gap 36 from scattering to the motor 10 side. The projecting portion 54 of the rotary blade 50 is located in the pipe-like suction port 42 of the pump housing 40 and the blade 60 is disposed in the pump chamber 44. In the present embodiment, the shaft portion 52, the blade 60, the shaft portion 53, and the projecting portion 54 are integrally formed of resin, the blade 60 is a four flat plate, and the projecting portions 54 are four pieces. However, the number and the number thereof are appropriately selected.
Between the blades 60, auxiliary blades 68 are provided standing on the surface of the disk-shaped member 62. The pump head can be increased by the auxiliary blade 68. A plurality of auxiliary blades 68 may be provided. Further, the tip end portion (the lower end portion in FIGS. 1 and 2) of the protruding portion 54 is formed on a tapered surface 56 that is tapered. The inclination angle of the taper surface 56 is, for example, 45 degrees.
[0014]
Furthermore, in this embodiment, the outer peripheral ends of the blade 60 and the auxiliary blade 68 are connected by a cylindrical wall member 64, and the height of the cylindrical wall member 64 is the height of the upper edge of the blade 60 and the auxiliary blade 68. The height of the cylindrical wall member 64 may be the same as the height of the upper edge portions of the blades 60 and the auxiliary blades 68.
[0015]
And by setting it as the structure which surrounds the outer peripheral part of the blade | wing 60 with the wall member 64, when the drainage pump stops, the return water which flows from the discharge port 46 side to the suction port 42 side hits against this wall member 64, and is buffered. Smoothly falls into the suction port. Therefore, it has an effect of reducing noise caused by the return water.
[0016]
Next, the operation of the drain pump 1 will be described.
With this configuration, when the rotary blade 50 is rotated in a predetermined direction by driving the motor 10, the fluid sucked from the suction port 42 by the protrusion 54 rises and reaches the pump chamber 44, and is discharged by the blade 60. 46 is discharged. At this time, the contact area between the projecting portion 54 and the fluid to be sucked is small, and the load on the rotary blade 50 is reduced by restricting the suction amount, thereby obtaining a drainage pump that achieves miniaturization and weight reduction of the motor. Can do. In addition, since the amount of fluid suction can be regulated, the noise of the drainage pump can be reduced. In addition, due to the presence of the disk-shaped member 62, the rising liquid level is substantially divided into upper and lower parts, partially blocked so that the flow is restricted, and the fluid in contact with the blades 60 is discharged.
[0017]
In the present embodiment, the case where the blades 60 and the projecting portions 54 are each constituted by four pieces and four pieces is shown, but the number of these is not limited to four pieces and four pieces. Can be set to The blade 60 has a flat plate shape and is disposed on a plane including the axis of the shaft portion 52. Similarly, the projecting portion 54 is disposed on a plane including the axis of the shaft portion 52. The blades 60 and the protrusions 54 can be arranged in the same plane, but can be arranged in a phase other than the same plane. A disk-shaped member 62 attached to the lower edge portion of the blade 60 is provided at the connection portion of the projecting portion 54 and has an annular opening 63 inside.
That is, the disk-shaped member 62 is disposed on a plane orthogonal to the axis of the shaft portion 52, and the outer diameter is substantially equal to the outer diameter of the blade 60, extends in the radial direction in the inner diameter direction, and opens to the inner peripheral portion. Part 63. The attachment position of the disk-shaped member 62 may be provided on the most protruding portion 54 side of the blade 60, or may be provided at an arbitrary position in the height direction of the blade.
[0018]
Furthermore, in the drainage pump 1 according to the present invention, it is possible to reduce noise by performing dimple molding on the surface of the rotary blade 50.
In the drainage pump of the present invention, dimple molding is performed on at least one of the bottom surface 62a of the disk-shaped member 62 that is the surface of the rotary blade 50 and the outer peripheral surface 64a of the disk-shaped wall member 64. A recess is formed in one or both of the bottom surface 62a and the outer peripheral surface 64a.
[0019]
FIG. 6 shows a cross section of a part of the bottom surface 62a of the disk-shaped member 62 subjected to dimple molding or the outer peripheral surface 64a of the cylindrical wall member 64. Reference numeral 65 denotes a concave portion formed by dimple molding. The length L is, for example, about 0.05 mm to 0.3 mm, and the diameter D is, for example, about 0.5 mm to 3 mm.
[0020]
By such dimple molding, the noise levels at the rotation speed of the motor 10 at 50 and 60 cycles are 33 dB and 37 dB, respectively, and the noise is greatly reduced compared to the conventional cases of 38 dB and 42 dB, respectively. .
Such noise reduction is considered as follows. That is, since the rotary blade 50 is in contact with water and transmits kinetic energy to the water, by providing a concave portion on the contact surface with the water, bubbles generated in the water are reduced, and noise generated when the bubbles are crushed is reduced. Is done.
[0021]
【The invention's effect】
As described above, according to the drainage pump according to the present invention, it is possible to reduce the contact area between the drain water sucked from the suction port and the protruding portion constituting the rotary blade. Accordingly, the load on the protruding portion is reduced, and a drainage pump including a motor that is reduced in size and weight can be realized. Moreover, since the suction amount is regulated, a drainage pump that can reduce noise can be realized. Furthermore, a drainage pump with reduced noise can be realized by applying dimple molding to the rotating blades.
[Brief description of the drawings]
FIG. 1 is a side view showing a partially sectioned embodiment of a drainage pump according to the present invention.
2 is a side view of the rotary blade of FIG. 1. FIG.
FIG. 3 is a plan view of the rotary blade of FIG. 1;
4 is a bottom view seen from the direction of the arrow in FIG. 2. FIG.
FIG. 5 is an enlarged view of a portion A in FIG. 4;
FIG. 6 is a cross-sectional view showing a main part of the present embodiment.
[Explanation of symbols]
1 .. Drain pump 10 .. Motor 12 .. Output shaft 14 .. Drained disk 30 .. Pump body 32 .. Cover 32 a wall 32 b .. Bottom surface 34 .. Seal member 36 .. Gap 40 .. Pump housing 42・ ・ Suction port 43 ・ ・ Suction pipe 44 ・ ・ Pump chamber 45 ・ ・ Discharge pipe 46 ・ ・ Discharge port 50 ・ ・ Rotary blade 52 ・ ・ Shaft part 52 a ・ ・ Hole 53 ・ ・ Shaft part 54 ・ ・ Protruding part 56 · · Tapered surface 60 · · Blade 62 · · Disc shaped member 63 · · Opening 62a · · Bottom surface of disc shaped member 64 · · Cylindrical wall member 64a · · Outer circumferential surface of cylindrical wall member 65 ·・ Recess 68 ・ ・ Auxiliary blade

Claims (2)

The rotary body includes a pump body having a suction port at a lower end and a discharge port on an upper surface, a rotating rotator that is rotatably housed in the pump body, and a motor that rotates the rotator. The shaft portion connected to the output shaft of the motor, the plate-like blades provided radially from the shaft portion, and the shape projecting around the shaft portion connected below the shaft portion is the output shaft direction And a disk-like member having an opening provided between the protrusion and the blade, and a wall member that connects the outer peripheral edges of the plate-like blade. Drainage pump characterized by The said blade | wing and a projecting part are arrange | positioned in the plane containing the axis line of the said shaft part, and the said disk-shaped member is arrange | positioned in the plane orthogonal to the said axis line. Drainage pump.

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