JP4267118B2 - Drainage pump - Google Patents

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 cooling operation, and drops into a drain van provided below the heat exchanger. A drainage pump is provided to drain the drain water accumulated in the drain van. Various types of drainage pumps have been proposed in the past, and this type of pump includes the following. In other words, 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 the 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 for communicating the atmosphere with the housing. Accordingly, when the blade is rotated by driving the motor, the drain water stored in the drain van is sucked in from the lower end of the blade of the suction port, pumped up along the inner surface of the housing, and discharged from the discharge port of the casing to the outside. The
[0003]
As a configuration of blades used for this type of drainage pump, there is one disclosed in JP-A-9-68185. That is, FIG. 12 is a front view, partly in section, showing the overall configuration of a conventional drainage pump. 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.
[0004]
The rotary blade 50 provided in the 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 figure, four small-diameter blades 54 are provided. The shaft portion 52 protrudes 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 a 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.
[0005]
The small-diameter blade 54 of the rotary blade 50 is inserted into the pipe-shaped suction port 42 of the 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. A large-diameter blade 60 of the rotary blade 50 is accommodated in the pump chamber 44 of the housing 40.
[0006]
13 is a side view of the rotary blade 50, FIG. 14 is a detailed view of a portion B in FIG. 13, FIG. 15 is a top view of the rotary blade 50, and FIGS. 16 (A), (B) and (C) are FIG. It is a figure which shows a part of AA sectional drawing, BB cross section, and CC cross section.
[0007]
The rotary blade 50 includes a shaft portion 52 and a plate-shaped large-diameter blade 60 extending radially outward from the outer peripheral portion of the shaft portion 52, and the lower edge portion of the large-diameter blade 60 is formed in a tapered shape. The edges are connected by a disc-shaped annular member 62 having a hollow portion 63. A small-diameter blade 54 is provided below the large-diameter blade 60. The large-diameter blades 60 and the small-diameter blades 54 are integrally formed of a resin and are each four flat plates, but the number of the blades 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 tapered surface 56 is, for example, 45 degrees.
[0008]
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.
[0009]
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. Further, 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 by the rotation of 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 stops, the water returning from the discharge port 46 to the pump chamber 44 in the casing hits the cylindrical wall member 64 and is gradually diffused by the buffering of the cylindrical wall member 64 to return water. The resulting noise is also reduced. In addition, 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 are provided. The drain water to which the energy flowing in the radial direction by the rotation of the water smoothly moves over the upper edge portion of the cylindrical wall member 64, so that the noise can be reduced.
[0010]
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, it is needless to say that 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 portion of the large-diameter blade 60 and the auxiliary blade 68 is 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.
[0011]
[Problems to be solved by the invention]
By the way, in the configuration of the conventional drainage pump, noise can be reduced by forming the height of the upper edge of the cylindrical wall member lower than the height of the upper edge of the large-diameter blade. No special consideration was given to making the work more effective.
The present invention has been made in view of these points, and the object of the present invention is to enable reduction of noise by determining the height of the large-diameter blade and the height of the cylindrical wall member. It is to provide a drainage pump.
[0012]
[Means for Solving the Problems]
The inventors of the present invention have made various studies to reduce the noise level when the height of the cylindrical wall member is lower than the height of the large-diameter blade. As a result, it has been found that the height dimensions of both may be set to a predetermined relationship.
[0013]
Accordingly, the drainage pump according to the present invention is a drainage pump having a rotary vane connected to a drive shaft of a motor and a housing for accommodating the rotary vane, wherein the rotary vane is connected to a drive shaft of the motor. a shaft portion, a plurality of plate-shaped large radius vanes provided radially from the shaft portion, a plurality of plate-shaped small-diameter vanes provided in the axial direction in the lower portion of the large radius vanes, under the large radius vanes A disk-shaped annular member having a hollow portion for connecting the edge portion, and a cylindrical wall member at the outer edge portion of the disk-shaped annular member for connecting the outer peripheral edge of the large-diameter blade. of the height dimension T ratio of height S of the cylindrical wall member, a feature that has been set in a range of S / T = 4.0 / 6.0~4.5 / 6.0 Yes.
[0014]
Moreover, as a preferable specific aspect of the drainage pump according to the present invention, an auxiliary blade is erected on a disk-shaped annular member inside the cylindrical wall member.
[0015]
In the drainage pump according to the present invention configured as described above, the ratio of the height dimension S of the cylindrical wall member to the height dimension T of the large-diameter blade is S / T = 4.0 / 6.0. Since it is formed in the range of 4.5 / 6.0, the noise generated from the drainage pump can be extremely effectively reduced.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a drainage pump according to the present invention will be described with reference to the drawings. In the description of the embodiment, components having the same functions as those of the conventional example will be described with the same reference numerals. In the embodiment, the motor is the same as that of the conventional example. Is omitted, and only the configuration of the rotary blade is shown.
1 is a front view of an embodiment of a rotary vane of a drainage pump, FIG. 2 is a top view seen from the direction of arrow P in FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along the line GG in FIG. 2, FIG. 6 is a cross-sectional view taken along the line EE in FIG. 4, FIG. 7 is a detailed view of a portion F in FIG. It is H sectional drawing.
[0017]
The rotary blade 50 is made by molding plastic and has a plurality of flat plate-like, for example, four small-diameter blades 410. The upper portion of the small-diameter blade is connected to a plurality of, for example, four large-diameter blades 450 via a tapered portion 411.
[0018]
A cylindrical shaft 420 is provided at the center of the large-diameter blade 450, and the shaft 420 has a bottomed hole 430 at the center. A motor output shaft (not shown) is press-fitted into the hole 430 to transmit the rotational force of the motor to the rotary blade 50.
The lower edge portion of the large-diameter blade 450 is covered with a disk-shaped annular member 460. An opening 462 is formed at the center of the annular member 460.
[0019]
The outer peripheral edge of the disc-shaped annular member 460 is connected to the cylindrical wall member 470. The wall member 470 connects the outer edge portions of the large-diameter blades 450, and the upper edge portion 472 of the cylindrical wall member 470 is formed lower than the upper edge portion 451 of the large-diameter blades 450.
[0020]
Four auxiliary large-diameter blades 452 are provided inside the cylindrical wall member 470. The auxiliary blade 452 is disposed in the middle of the four large-diameter blades 450 and extends in the direction of the opening 462 of the disk-shaped annular member 460. In the embodiment shown in FIG. 6, the inner edge 454 has a shape extending to the vicinity of the position of the opening 462 of the disc-shaped annular member 460.
The height position of the upper edge portion 453 of the auxiliary blade 452 is adjusted to the height position of the upper edge portion 451 of the large diameter blade 450, and the upper edge portion 451 of the large diameter blade 450 and the upper edge portion 453 of the auxiliary blade 452. Is exposed from the upper edge 472 of the cylindrical wall member 470. This exposed part contributes to ensuring the maximum lift of the rotating blades. Further, only the upper edge portion of the large-diameter blade and the auxiliary blade may be exposed.
[0021]
7 and 8 show the shapes of a tapered portion 412 formed at the lower end portion of the small-diameter blade 410 and an arc-shaped chamfer 414 formed at the outer edge portion of the small-diameter blade 410.
The blade | wing which is a rotary body with which the drainage pump of this invention is equipped has the above shapes and structures, and comprises a lightweight rotary body. Therefore, pumping with less vibration and noise can be achieved.
[0022]
FIG. 9 is an explanatory diagram showing an example of the dimensions of the rotary blade 50.
The outer diameter of the rotary blade 50 is selected according to the required specifications of the drainage pump. For example, the outer diameter of the rotating blade 50 is 35 mm.
When the height dimension of the cylindrical wall member 470 is S and the height dimension of the large-diameter blade 450 is T, a change in noise and the maximum head was tested. Specifically, the height dimension T of the large-diameter blade 450 is fixed to 6.0 / mm, and the height dimension S of the cylindrical wall member 470 is changed from 3.5 mm to 6.0 mm every 0.5 mm. The characteristics of noise and maximum head were tested.
[0023]
FIG. 10 shows the experimental results when the rated voltage is 50 hertz, and FIG. 11 shows the experimental results when the rated voltage is 60 hertz. 10 and 11, the horizontal axis represents the S / T ratio, and the vertical axis represents the noise (dB) and the cutoff lift (mm).
In FIG. 10, while maintaining the high performance of the deadline lift represented by the curve connected by the crosses in the figure, the noise performance is maintained at the lift of 700 mm when the S / T ratio is 4.0 / 6.0. The noise performance decreases at the time of drain water discharge (represented by a curve connected by △ in the figure) and at the end of the drain water discharge (represented by a curve connected by □ in the figure). The ratio is maintained at 4.5 / 6.0 and 5.0 / 6.0, but the deadline lift is lowered when the S / T ratio is 5.0 / 6.0.
[0024]
11 also shows the performance of the deadline lift and the noise performance similar to those in FIG. That is, when the S / T ratio is 4.0 / 6.0, a high deadline lift (represented by a curve connected with a cross in the figure) is maintained, and the noise performance is the discharge of drain water holding a lift of 700 mm. The noise performance decreases at the time (represented by a curve connected by Δ in the figure) and at the end of drain water discharge (represented by a curve connected by □ in the figure), and this noise performance has an S / T ratio of 4. Although it is maintained at 5 / 6.0 and 5.0 / 6.0, the deadline lift is lowered at an S / T ratio of 5.0 / 6.0.
Therefore, the height dimension S of the cylindrical wall member as the shape of the blade 400 is between 4.0 / 6.0 and 5.0 / 6.0 with respect to the height dimension T of the large-diameter blade, that is, large. By setting the height dimension of the cylindrical wall member to about 66% to 83% with respect to the height dimension of the diameter blades, it is possible to improve the noise performance without deteriorating the cutoff lift performance.
[0025]
In the embodiment described above, the case where the auxiliary blade is formed on the rotary blade 50 has been described. However, the present invention can be applied to the case where the auxiliary blade is not used, and the large blade or the auxiliary blade. The blade can also be applied to a configuration in which the upper edge portion is not exposed to the upper edge portion of the cylindrical wall member.
[0026]
【The invention's effect】
As can be understood from the above description, the drainage pump according to the present invention appropriately determines the range in which the height of the cylindrical wall member is formed lower than the height of the large-diameter blade of the rotary blade, and therefore maintains the deadline lifting height. However, noise can be reduced.
Moreover, since the external shape and main components of the conventional drainage pump are not significantly changed, it is possible to manufacture a drainage pump capable of reducing noise at low cost.
[Brief description of the drawings]
FIG. 1 is a front view of a rotary blade of a drainage pump according to the present invention.
FIG. 2 is a plan view of a rotary blade of the drainage pump of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG.
5 is a cross-sectional view taken along the line GG in FIG.
6 is a cross-sectional view taken along the line E-E in FIG. 4;
FIG. 7 is a detailed view of part F in FIG. 1;
8 is a cross-sectional view taken along the line HH in FIG.
FIG. 9 is an explanatory view showing dimensions of the rotary blade of the present invention.
FIG. 10 is a characteristic curve diagram showing the effect of the present invention.
FIG. 11 is a characteristic curve diagram showing the effect of the present invention.
FIG. 12 is a side view showing a partial section of a conventional drainage pump.
13 is a side view of the rotary blade of FIG. 12;
14 is a detailed view of part B in FIG.
15 is a top view of the rotary blade of FIG. 13;
16 is a cross-sectional view for explaining the rotary blade shown in FIGS. 13 and 15. FIG.
[Explanation of symbols]
50 Rotating blade 410 Small diameter blade 450 Large diameter blade 460 Annular member 470 Cylindrical wall member

Claims (4)

A rotary vane connected to the drive shaft of the motor, the drain pump and a housing for accommodating the rotation vane, said rotary vane comprises a shaft portion connected to the drive shaft of the motor, in a radial direction from the shaft portion A disk shape having a plurality of plate-shaped large-diameter blades provided, a plurality of plate-shaped small-diameter blades provided in the axial direction below the large-diameter blades, and a hollow portion connecting the lower edge of the large-diameter blades And a cylindrical wall member at the outer edge of the disk-shaped annular member and connecting the outer peripheral edge of the large-diameter blade, and the cylindrical shape with respect to the height dimension T of the large-diameter blade The ratio of the height dimension S of a wall member was set to the range of S / T = 4.0 / 6.0-4.5 / 6.0 , The drainage pump characterized by the above-mentioned.   2. The drainage pump according to claim 1, wherein an auxiliary blade disposed in the middle of the large-diameter blade is erected on the disk-shaped annular member inside the cylindrical wall member.   The discharge pump according to claim 1, wherein an upper edge portion of the large-diameter blade is located above an upper edge portion of the cylindrical wall member.   3. The drainage pump according to claim 2, wherein the auxiliary blade has an upper edge located above the upper edge of the cylindrical wall member.

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