JP2000213769A - Drain pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises while securing a head in a pump mounted on air conditioning equipment to discharge drain water. SOLUTION: The pump body of a drain pump has a suction port protruding downward and a delivery port protruding sideways. A blade 50 within the pump body is rotated by a motor. The blade 50 has a structure of enclosing the outer circumference part of a large-diameter blade 450 with a cylindrical wall member 470. The height to the upper rim part 453 of the large-diameter blade 450 is set in a fixed range with respect to the cylindrical wall member 470 to lower noises.

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 van provided below the heat exchanger. A drain pump is provided to drain the drain water accumulated in the drain van. 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 part, an upper part 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 part 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 van is sucked from the lower end of the blade at the suction port, pumped up along the inner surface of the housing, and discharged from the discharge port of the casing to the outside. You.

[0003] As a structure of a blade used in a drain pump of this type, there is one disclosed in Japanese Patent Application Laid-Open No. 9-68185. That is, FIG. 12 is a front view, partly in section, showing the entire configuration of a conventional drain pump. A drain pump, generally designated by the reference numeral 1, comprises a motor 10 and a motor 1
And a pump body 30 mounted below the bracket 0 via a bracket 20. The bracket 20 is formed integrally with a cover 32 which 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] Rotating blade 5 mounted in a housing 40
Numeral 0 has a shaft portion 52 and a small-diameter blade 54 composed of a plurality of flat plates protruding in the radial direction about the center axis of the shaft portion 52. In the figure, four small-diameter blades 54 are provided. The shaft 52 is
The drive shaft 12 of the motor 10 is inserted into a hole provided in the shaft 52 by projecting toward the motor 10 through a through hole 36 formed in the center of the cover 32. The draining disk 14 is attached to the upper surface of the shaft portion 52 to prevent the drain water spouting 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-shaped suction port 42 of the housing 40. The suction end 43 of the suction port 42 is formed on a tapered surface whose inner diameter is reduced toward the opening end, and the tip of the small-diameter blade 54 is also formed on a tapered tapered surface 56. In the pump chamber 44 of the housing 40, the large-diameter blade 6 of the rotary blade 50 is provided.
0 is stored.

FIG. 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. Figure 1
FIG. 5 is a diagram showing a part of an AA cross section, a BB cross section, and a CC cross section of FIG.

The rotary blade 50 includes a shaft 52 and a large-diameter flat blade 60 extending radially outward from the outer periphery of the shaft 52. The lower edge of the large-diameter blade 60 is formed in a tapered shape. ,
This lower edge portion is a disk-shaped annular member 62 having a hollow portion 63.
Are linked by Below the large diameter blade 60, a small diameter blade 54 is provided. The large-diameter blade 60 and the small-diameter blade 54 are integrally formed of resin and each have four flat plates, but the number is appropriately selected. An auxiliary blade 68 is provided between the large-diameter blades 60. The lift of the pump can be increased by the auxiliary blades 68. At the center of the shaft 52,
A hole 53 for inserting a drive shaft of the motor is provided,
The tip of the small-diameter blade 54 is formed in a tapered tapered surface 56. The inclination angle of the tapered surface 56 is, for example, 45
It is formed every time.

The small-diameter blade 54 has an arc-shaped chamfered portion 57 formed in the rotation direction. This arc-shaped chamfered portion 57
Has a radius of curvature approximately equal to the thickness dimension of the small diameter blade,
By providing the chamfered portion 57, noise due to stirring of the drain water in the suction port 42 is reduced, and the small-diameter blade 5
By the rotation of 4, the drain water is smoothly pulled up into the pump chamber 44.

The outer peripheral ends of the large-diameter blade 60 and the auxiliary blade 68 are connected by a cylindrical wall member 64. Cylindrical wall member 64
Is provided so that its height is smaller than the height dimension of the upper edge portion 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 inside the liquid due to the rotation of the large-diameter blades 60 smoothly flows to the discharge port 46, and the collision of the bubbles with the bottom surface 35 of the cover 32 is reduced, and noise is reduced. When the drain pump stops, the water returning from the discharge port 46 to the pump chamber 44 in the casing collides with the cylindrical wall member 64, and is gradually diffused by the buffer of the cylindrical wall member 64,
The noise caused by the return water is also reduced. Moreover,
The arc-shaped chamfer 70 is, for example, a cylindrical wall member 64.
By providing the arc-shaped chamfered portion 70 having a radius of curvature substantially equal to the thickness of the plate, the drain water to which the energy flowing in the radial direction by the rotation of the large-diameter blade 60 and the auxiliary blade 68 is applied is cylindrical. The noise can be reduced by smoothly riding over the upper edge of the wall member 64.

The lower end of the cylindrical wall member 64 is
The annular member 62 is connected to the annular member 62 connecting the lower edge of the auxiliary blade 68 to the lower blade 68. Although the figure shows a case where the cylindrical wall member 64 and the annular member 62 are integrally formed, they may be formed separately as a matter of course. Due to this annular member 62, the liquid level of the drain water rising from the suction port 42 is substantially vertically divided, 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 itself and the center of the rotating blade. Lower edges of the large-diameter blade 60 and the auxiliary blade 68 are formed in a shape inclined toward the small-diameter blade 64,
The annular member 62 is also formed in a dish shape in accordance with the inclination.

[0011]

By the way, in the construction of the conventional drain pump, the height of the upper edge of the cylindrical wall member is formed lower than the height of the upper edge of the large-diameter blade to reduce noise. However, no particular consideration has been given to making noise reduction more effective. The present invention has been made in view of such a point, and an object thereof is to reduce noise by determining the height of a large-diameter blade and the height of a cylindrical wall member. It is to provide a drainage pump.

[0012]

Means for Solving the Problems The present inventors have conducted various studies to reduce the noise level when the height of the cylindrical wall member is smaller than the height of the large-diameter blade. . As a result, they have found that it is sufficient to set the height dimensions of the two in a predetermined relationship.

According to the present invention, there is provided a drain pump having a rotating blade connected to a driving shaft of a motor, and a housing accommodating the rotating blade, wherein the rotating blade is connected to a driving shaft of the motor. A shaft portion to be connected, a plurality of plate-shaped large-diameter blades provided in a radial direction from the shaft portion,
A plurality of plate-shaped small-diameter blades provided axially below the large-diameter blade, a disk-shaped annular member having a hollow portion connecting a lower edge portion of the large-diameter blade, and a disk-shaped annular member. A cylindrical wall member at an outer edge portion for connecting an outer peripheral edge of the large-diameter blade, wherein a ratio of a height dimension of the cylindrical wall member to a height dimension of the large-diameter blade is 66% to 83%. %.

In a preferred specific embodiment of the drain pump according to the present invention, an auxiliary blade is provided upright on a disk-shaped annular member inside the cylindrical wall member. .

In the drain pump according to the present invention having the above-described structure, the ratio of the height of the cylindrical wall member to the height of the large-diameter blade is formed in the range of 66% to 83%.
Effective reduction of noise generated by the drain pump can be achieved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a drain pump according to the present invention will be described below with reference to the drawings. In the description of the embodiment, components having the same functions as those of the conventional example will be denoted by the same reference numerals, and in this embodiment, the motor will be the same as the conventional example. Are omitted, and only the configuration of the rotating blades is shown. 1 is a front view of an embodiment of a rotary blade of a drain pump, FIG. 2 is a top view seen from the direction of arrow P in FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is a sectional view taken along line GG of FIG. 2, FIG.
7 is a sectional view taken along the line EE of FIG. 4, FIG. 7 is a detailed view of a portion F in FIG. 1, and FIG. 8 is a sectional view taken along the line HH of FIG.

The rotary blade 50 is formed by molding plastic and has a plurality of flat plates, for example, four small-diameter blades 410. A plurality of, for example, four large-diameter blades 450 are provided on the upper portion of the small-diameter
Linked to

At the center of the large-diameter blade 450, a cylindrical shaft 420 is provided.
30. The output shaft (not shown) of the motor is press-fitted into the hole 430 to transmit the rotational force of the motor to the rotary blade 50. The lower edge of the large-diameter blade 450 is a disc-shaped annular member 4.
Covered with 60. An opening 462 is formed at the center of the annular member 460.

The outer peripheral edge of the disk-shaped annular member 460 is connected to a cylindrical wall member 470. The wall member 470 connects the outer edges of the large-diameter blade 450, and the upper edge 472 of the cylindrical wall member 470 is formed lower than the upper edge 451 of the large-diameter blade 450.

Inside the cylindrical wall member 470, four auxiliary large-diameter blades 452 are provided. The auxiliary blade 452 is disposed in the middle of the four large-diameter blades 450 and has a disk-shaped annular member 4.
It extends in the direction of 60 openings 462 and stands upright. In the embodiment shown in FIG. 6, the inner edge portion 454 has a shape extending to near the position of the opening 462 of the disk-shaped annular member 460. The height position of the upper edge 453 of the auxiliary blade 452 is adjusted to the height position of the upper edge 451 of the large-diameter blade 450, and the upper edge 451 of the large-diameter blade 450 and the upper edge 453 of the auxiliary blade 452. Are exposed from the upper edge 472 of the cylindrical wall member 470. This exposed portion contributes to securing the maximum lift of the rotating blade. Further, only the upper edge of either the large diameter blade or the auxiliary blade may be exposed.

FIGS. 7 and 8 show the shape of the tapered portion 412 formed at the lower end of the small-diameter blade 410 and the arc-shaped chamfer 414 formed at the outer edge of the small-diameter blade 410. The blade, which is a rotating body provided in the drain pump of the present invention, has the above-described shape and structure, and constitutes a lightweight rotating body. Therefore, pumping with less vibration and noise can be achieved.

FIG. 9 is an explanatory view showing an example of the dimensions of the rotary blade 50. As shown in FIG. The outer diameter of the rotary blade 50 is selected according to the required specifications of the drainage pump. For example, an outer diameter of φ 35 mm is used. Cylindrical wall member 47
0 is S, and the height of the large-diameter blade 450 is T.
Then, the noise and the change of the maximum head were tested. Specifically, the height T of the large-diameter blade 450 is fixed at 6.0 / mm, and the height S of the cylindrical wall member 470 is 3.5.
The characteristics of the noise and the maximum lift when changing from 0.5 mm to 6.0 mm in increments of 0.5 mm were tested.

FIG. 10 shows the experimental results at a rated voltage of 50 Hz, and FIG. 11 shows the experimental results at a rated voltage of 60 Hz. Note that in FIGS. 10 and 11,
The horizontal axis is the S / T ratio, and the vertical axis is the noise (dB) and the closing head (mm).
Represents In FIG. 10, while maintaining the performance of the closing lift represented by the curve connecting the crosses in the figure high, the noise performance is:
When the S / T ratio is 4.0 / 6.0, the head 700
mm when drain water is discharged (represented by the curve connected with △ in the figure) and at the end of drain water discharge (represented by the curve connected with □ in the figure). Are 4.5 / 6.0, 5.0 / 6.
0, but the S / T ratio is 5.0 / 6.0.
At that time, the deadline head is reduced.

FIG. 11 also shows the same head performance and noise performance as in FIG. That is, the S / T ratio is 4.
At 0 / 6.0, a high cutoff head (represented by the curve connecting the x marks in the figure) was maintained, and the noise performance was 700 m.
m at the time of discharge of drain water (represented by the curve connected by the symbol △ in the figure) and at the end of discharge of drain water (represented by the curve connected by the symbol □ in the figure). , S / T ratio is maintained at 4.5 / 6.0, 5.0 / 6.0, but the cutoff head is 5.0 / 6.0.
It drops at 0. Therefore, as the shape of the blade 400, the height S of the cylindrical wall member is changed to the height T of the large-diameter blade.
On the other hand, the height of the cylindrical wall member is set to about 66% to 83% between 4.0 / 6.0 to 5.0 / 6.0, that is, the height of the large-diameter blade. By setting between
The noise performance can be improved without lowering the cutoff head performance.

In the embodiment described above, the case where the auxiliary blade is formed on the rotary blade 50 has been described.
The present invention can of course be applied to the case where the auxiliary blade is not used, and the large-diameter blade or the auxiliary blade is also applicable to the case where the upper edge is not exposed to the upper edge of the cylindrical wall member. it can.

[0026]

As will be understood from the above description, in the drainage pump according to the present invention, 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 is appropriately determined. In addition, noise can be reduced while maintaining the closing lift. Further, since the outer shape and main components of the conventional drain pump are not significantly changed, a drain pump capable of reducing noise at low cost can be manufactured.

[Brief description of the drawings]

FIG. 1 is a front view of a rotating blade of a drainage pump according to the present invention.

FIG. 2 is a plan view of a rotating blade of the drainage pump according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along line GG of FIG. 2;

FIG. 6 is a sectional view taken along line EE of FIG. 4;

FIG. 7 is a detailed view of a portion F in FIG. 1;

FIG. 8 is a sectional view taken along the line HH of FIG. 7;

FIG. 9 is an explanatory view showing dimensions of the rotating blade of the present invention.

FIG. 10 is a characteristic curve showing the effect of the present invention.

FIG. 11 is a characteristic curve showing the effect of the present invention.

FIG. 12 is a side view showing a partial cross section of a conventional drain pump.

FIG. 13 is a side view of the rotary blade of FIG. 12;

FIG. 14 is a detailed view of a portion B in FIG. 13;

FIG. 15 is a top view of the rotating blade of FIG. 13;

FIG. 16 is an explanatory sectional view of the rotating blade shown in FIGS. 13 and 15;

[Explanation of symbols]

 Reference Signs List 50 rotating blade 410 small-diameter blade 450 large-diameter blade 460 annular member 470 cylindrical wall member

Claims (4)

[Claims] 1. A drain pump comprising: a rotating blade connected to a driving shaft of a motor; and a housing accommodating the rotating blade, wherein the rotating blade has a shaft connected to a driving shaft of the motor; A plurality of plate-shaped large-diameter blades provided in the radial direction, a plurality of plate-shaped small-diameter blades provided axially below the large-diameter blade, and a hollow portion connecting the lower edge of the large-diameter blade. 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, with respect to the height dimension of the large-diameter blade. The ratio of the height dimension of the cylindrical wall member is 66
%. A drainage pump formed in the range of% to 83%. 2. The apparatus according to claim 1, wherein an auxiliary blade disposed in the middle of the large-diameter blade on the inside of the cylindrical wall member stands on the disk-shaped annular member. The described drainage pump. 3. The discharge pump according to claim 1, wherein an upper edge of the large-diameter blade is exposed at an upper edge of the cylindrical wall member. 4. The drain pump according to claim 2, wherein an upper edge of the auxiliary blade is exposed at an upper edge of the cylindrical wall member.