JP3282772B2 - Drainage pump - Google Patents

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 attached to a drain tank for storing drain water of an air conditioner and draining the drain to the outside.

[0002]

2. Description of the Related Art Conventionally, as a drainage pump for an air conditioner used for the above-mentioned applications, for example, a liquid discharge pump disclosed in Japanese Utility Model Publication No. 3-35915 and Japanese Utility Model Application Laid-Open No. 6-60795 is known. The pump for discharging liquid has a pump body having a suction port on the small diameter side and a discharge port on the large diameter side with a curved surface whose inner surface gradually increases in diameter, and a gap so as not to contact the inner surface of the pump body. And rotating blades that rotate.

When the rotating blade is rotated in a predetermined direction by an electric motor driven when the liquid reaches a water level in contact with the tip of the rotating blade, the liquid adhering to the tip of the rotating blade is rotated. Since the outer diameter of the blades and the inner diameter of the pump body gradually increase upward, the centrifugal force acting on the liquid gradually increases as it flows upward in the pump body, so that a predetermined lift force is generated. I keep it. Japanese Unexamined Utility Model Publication No. Hei 6-60795 has a blade shape in which four or six blades protruding radially from the rotation axis of the pump are formed, and the even-numbered blades are formed by cutting the lower half of the odd-numbered blades. Having. In addition, the actual opening Hei 5-38385
This publication discloses a drain pump having a small-diameter curved blade below four rotating blades. Similarly, 6-67
No. 887 discloses a drainage pump having two or four small-diameter blades below two or four large-diameter blades.

[0004]

FIG . 15 shows the structure of a drainage pump provided with, for example, four large-diameter blades and four small-diameter blades. The drainage pump 1 has a pump body 10 and a cover 30 that covers an upper part of the pump body 10. Pump body 10
Is a pump chamber 1 formed by a cylindrical housing 11
2 and a suction port 15 provided at the lower center of the pump chamber 12.
And a discharge pipe 16 forming a discharge port 17 extending horizontally from the pump chamber.

A rotary blade 40, which is a rotary body attached to an output shaft of a motor (not shown), has four large-diameter blades 44 housed in a shaft 42 and the pump chamber 12 connected to the shaft 42.
And a shaft 4 of the rotary blade 40 having four small-diameter blades 46 below the large-diameter blade 44 and housed in the suction pipe 14.
There is a through hole 32 between the cover 2 and the cover 30, and a sheet 34 for preventing splashing of water is attached to the upper part of the through hole 32 on the rotating shaft.

FIG . 15A is a top view of the rotating blade 40, showing a state in which the rotating blade 40 is rotating in the direction of the arrow in the pump chamber to drain water. FIG. 15 schematically shows the result of observing the state of drainage by the rotating blades 40 by forming the pump body and the cover with a transparent resin for the experiment .
(A), it has been found that bubbles are generated around the large-diameter blade 44 of the rotary blade 40 as indicated by reference numeral G1. This air bubble is generated on the rotating blades, the inner wall surface of the pump chamber,
It collides with the inner wall surface of the suction pipe and causes noise and vibration. SUMMARY OF THE INVENTION The present invention provides a drainage pump including a rotating blade that reduces the generation of bubbles.

[0007]

SUMMARY OF THE INVENTION In a drain pump according to the present invention, a pump body provided with a suction port at a lower end and a discharge port at an upper side surface, and a rotating body rotatably accommodated in the pump body. A rotating body, and a motor for rotating the rotating body, wherein the rotating body has a shaft portion connected to an output shaft of the motor, a plate-shaped large-diameter blade provided in a radial direction from the shaft portion, and a large-diameter. A plate-shaped small-diameter blade provided in a lower part of the blade in the output axis direction, and a disk for restricting the flow by partially blocking the flow of the liquid flowing from the suction port to the discharge port between the large-diameter blade and the small-diameter blade. This disk has a hollow portion.

[0008]

By providing a disk having a hollow portion between a large-diameter blade and a small-diameter blade, the amount of water in contact with the large-diameter blade is reduced, the load on the rotating body is reduced, and the generation of bubbles is also reduced. .

[0009]

1 is an explanatory view showing the structure of a drainage pump according to an embodiment of the present invention, FIG. 2 is a perspective view of a rotary blade, and FIG. 3 is a partial cross-sectional view showing a joint between a pump housing and a cover. It is. The drain pump generally designated by reference numeral 1A has a pump body 10 and a cover 30 that covers an upper part of the pump body 10. The pump body 10 has a pump chamber 12 formed by a cylindrical housing 11 having a bottom surface 12b formed by a curved surface whose diameter gradually increases, and having a wall 12a formed to rise continuously from the bottom surface 12b. And a suction pipe 14 forming a suction port 15 provided at the lower center of the pump chamber 12 and a discharge pipe 16 forming a discharge port 17 extending horizontally from the pump chamber.

A motor 50 mounted on an upper part of the cover 30
The output shaft 52 of the rotary blade 100 is disposed in the pump chamber.
, And a predetermined gap is provided between the shaft portion 110 and the cover 30. Rotating blade 10
Reference numeral 0 denotes a shaft portion 110 having a hole 112 into which the motor output shaft 52 is inserted, as shown in FIG.
A plate-shaped large-diameter blade 120 provided in a radial direction from 0;
A donut-shaped disk 150 attached to the plate-shaped large-diameter blade 120 so as to partially block and restrict the flow from the suction side to the discharge side, and a lower part of the large-diameter blade 120 via the disk 150 in the output shaft direction And a plate-shaped small-diameter blade 130 provided at the bottom. That is, the large-diameter blade 120 and the small-diameter blade 130 are connected to the disk 1 that connects the outer peripheral edge of the large-diameter blade 120 on the small-diameter blade side.
50 are connected.

The rotary blade 100 is disposed in the pump body 10, the large-diameter blade 120 is located in the pump chamber 12, and the small-diameter blade 130 is located in the suction pipe 14. With this configuration, when the rotary blade 100 is rotated in a predetermined direction by the driving of the motor 50, the suction port 15 is
The liquid sucked up from rises and reaches the pump chamber 12,
The large diameter blade 120 discharges from the discharge port 17. At this time, due to the presence of the disk, the rising liquid surface is substantially vertically divided, partially blocked so that the flow is restricted, and the liquid in contact with the large-diameter blade is discharged.

In this embodiment, the large-diameter blade 120 and the small-diameter blade 130 are each composed of four blades. However, the number of these blades is not limited to four but may be set to an appropriate number. be able to. The large-diameter blade 120 has a flat plate shape and is disposed on a plane including the axis of the shaft 110. Similarly, the small-diameter blade is disposed on a plane including the axis of the shaft portion 110. The large-diameter blade and the small-diameter blade can be arranged on the same plane, but can be arranged on a plane other than the same plane with different phases. The disk 150 attached to the large-diameter blade 120 is provided at a connection portion of the small-diameter blade 130 and has an annular hollow portion 155 inside. Disk 150
Is disposed on a plane orthogonal to the axis of the shaft portion 110, the outer diameter is substantially equal to the outer diameter of the large-diameter blade, extends radially inwardly, and has a hollow portion in the inner peripheral portion. The mounting position of the disk may be provided on the small-diameter blade side of the large-diameter blade, or may be provided at an arbitrary position in the height direction of the large-diameter blade.

FIG. 3 shows the main housing 11 and the cover 30.
It is explanatory drawing which shows the joining structure of. The entire pump body 10 is made of synthetic resin, and an outer peripheral wall 1
8 is provided with a protrusion 19 protruding inward.
The two projections 19 are provided, for example, opposite in diameter. The cover 30 is also made of synthetic resin.
A flange 34 having a larger height is provided on the outer periphery of the zero. The projection 19 made of synthetic resin has elasticity. Therefore, by pushing the cover 30 toward the projection 19, the cover 30 is fitted to the housing 11 of the pump body and is securely attached by the elasticity of the projection 19. 20 is a packing for sealing.

FIG. 4, FIG. 5, and FIG. 6 are a top view, a front view, and a bottom view of a rotary blade provided in the drainage pump of the present invention.
The rotary blade generally designated by reference numeral 100 has a shaft portion 110 having a hole 112 into which an output shaft of a motor is inserted, and four large-diameter blades 120 formed of a plate material extending radially around the outer periphery of the shaft portion 110. . The lower edge 122 of the large-diameter blade 120 is formed in a tapered shape. This taper matches the tapered shape which is the curved surface of the bottom surface 12b of the pump chamber 12 of the pump body 10. Note that the large-diameter blade does not have to match the tapered shape of the bottom surface 12b. The lower parts of the four large-diameter blades are connected by a disk 150. The disk 150 has a flat ring shape, and has a hollow portion 1 at an inner peripheral portion.
55.

Below the large diameter blade 120, four small diameter blades 130 are formed. This small-diameter blade 130 is also made of a plate material. The phase with the large-diameter blade may be matched or the phase may be changed. The outer diameter of the small diameter blade is 150
Is formed to be larger than the inner diameter of the hollow portion 155. Therefore, it is scraped up by the small-diameter blade 130 and sent to the large-diameter blade 120. In addition, the rotary blade may be formed by integrally forming the large-diameter blade / disk and the small-diameter blade with a synthetic resin, or may be formed separately.

FIG . 14 is an explanatory diagram for explaining the operation and effect of the present invention. In the drain pump 1A equipped with the rotating blade 100 of the present invention, when the pump is operated, a small amount of bubbles G2 formed around the large-diameter blade 120 as shown in FIG. Only occurs. This is disk 150
, The mixed surface of the liquid and the gas is cut off, and the flow is restricted so that the flow is restricted, so that the lower boundary surface W1 of the disk 150 and the upper boundary surface W2 of the disk 150 are restricted. And the upper boundary surface W2 is expanded outward in the radial direction by the action of the centrifugal force. As a result, the area of the liquid in contact with the large-diameter blade 120 is reduced. Therefore, the load is reduced, and the load torque is also reduced. For example, the load torque is 40 g.
It is less than r-cm. In addition, since the contact area of the liquid with the large-diameter blade 120 is reduced, the collision of the bubble with the blade is reduced, and the noise can be reduced to, for example, 40 dB or less, and the noise and vibration are reduced.

FIGS. 7, 8, and 9 are a top view, a front view, and a bottom view, respectively, showing another practical example of the rotary blade of the present invention. A disk having a hollow portion in the inner peripheral portion is tapered. FIG. That is, the rotary blade generally denoted by reference numeral 200 has a shaft portion 210 having a hole 212 into which a motor shaft is inserted, and four large-diameter blades 220 are formed on the outer periphery of the shaft portion 210, for example. The lower edge is locked in a tapered shape, and a dish-shaped disk 250 having a shape for receiving the lower edge is provided. Large diameter blade 220
A small-diameter blade 230 is formed below the space. The shape of the small-diameter blade is the same as that of the above-described embodiment.

FIG. 10 is an enlarged sectional view of a dish-shaped disk 250. This disk also has a hollow portion 255 at the center, and the inner diameter of the hollow portion 255 is formed larger than the outer diameter of the small-diameter blade 230. The drain pump equipped with the rotating blades of this embodiment has the same operation and effect as the previous embodiment. Furthermore, since the rotating blade of this embodiment has a tapered disk 250, even when the blade is stopped, drainage is smoothly returned to the drain tank without remaining on the disk 250.

Next, the characteristics of the rotating blades shown in FIGS. 4 to 6 will be described. FIG. 11 illustrates a method of determining the outer diameter of the rotating blade. In this graph, the horizontal axis indicates the diameter of the rotating blade, and the vertical axis indicates the maximum head of the pump.
The theoretical head H of the pump is calculated by the equation in the figure, and the value is indicated by a curve indicated by a solid line in the graph. In the case of a drain pump for an air conditioner, a function of discharging condensed water generated in the heat exchanger to the outside of the device is sufficient, and a large head is not required. Therefore, for example, the design lift of the rotating blade is set to 850.
mm, the diameter of the rotating blade is 32.mm.
It turns out that it becomes 5 mm. In consideration of the range of the head of the drain pump, the diameter of the rotating blade is, for example, 30 to 35.
It can be seen that it is desirable to set it to about mm.

FIG. 12 shows the change in the head when the size of the hollow portion is changed when the diameter of the hollow portions 155 and 255 of the disks 150 and 250 is plotted on the horizontal axis, and when the height is set on the vertical shaft. It is a graph shown. From this graph, it can be seen that the diameter of the hollow portion is optimally 20 mm, and is desirably set to 18 to 22 mm.

FIG. 13 is a graph showing the change in the head when the thickness of the disks 150 and 250 is changed on the horizontal axis and the thickness of the disks 150 and 250 is changed on the vertical axis. is there.
From this graph, it is understood that the thickness of the disk is desirably set to about 1 to 2 mm. However, it is necessary to determine the thickness of the disk in consideration of the requirements such as the material of the disk and the required mechanical strength.

[0022]

[0023]

As described above, the drainage pump according to the present invention has a plurality of large-diameter blades and a plurality of rotary blades disposed below the large-diameter blades in the pump main body. Of small diameter blades. The lower edges of the large-diameter blades are connected by a disk, and a hollow portion is formed inside the disk. With this configuration, the liquid surface rising from the small-diameter blade rotating in the suction port toward the large-diameter blade is almost vertically divided by the disk, and the liquid in contact with the large-diameter blade is discharged. . This action reduces the amount of liquid applied to the large diameter blade and reduces the load on the blade. In addition, there is an effect that the amount of generated bubbles is reduced and noise is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a drainage pump according to the present invention.

FIG. 2 is a perspective view of a rotating blade of the present invention.

FIG. 3 is an explanatory view showing a connection structure between a pump body and a cover according to the present invention.

FIG. 4 is a top view of the rotating blade of the present invention.

FIG. 5 is a front view of the rotating blade of the present invention.

FIG. 6 is a bottom view of the rotating blade of the present invention.

FIG. 7 is a top view showing another embodiment of the rotating blade of the present invention.

FIG. 8 is a front view showing another embodiment of the rotating blade of the present invention.

FIG. 9 is a bottom view showing another embodiment of the rotating blade of the present invention.

FIG. 10 is a sectional view of a disk.

FIG. 11 is a graph showing a relationship between a diameter of a rotating blade and a head.

FIG. 12 is a graph showing a relationship between a diameter of a hollow portion of a disk and a head.

FIG. 13 is a graph showing the relationship between the thickness of the disk and the lift.

FIG. 14 is an explanatory view showing the operation of the drain pump of the present invention.

FIG. 15 is an explanatory view showing the operation of a conventional drain pump.

[Explanation of symbols]

 1, 1A Drainage pump 10 Pump body 12 Pump chamber 15 Suction port 17 Discharge port 19 Projection 30 Cover 50 Motor 52 Motor drive shaft 100 Rotating blade 110 Shaft 120 Large diameter blade 130 Small diameter blade 150 Disk 155 Hollow portion

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F04D 29/28 F04D 1/14 F04D 13/00 F24F 1/00 361

Claims (10)

(57) [Claims] A pump body provided with a suction port at a lower end portion and a discharge port at an upper side surface, a rotating body rotatably accommodated in the pump body, and a motor rotating the rotating body. made, the rotating body includes a shaft portion coupled to an output shaft of the motor, a plate-shaped large radius vanes provided radially from the shea Yafuto portion, provided on an output shaft direction in the lower portion of the large radius vanes A drain pump comprising: a plate-shaped small-diameter blade; and a disk having a hollow portion between the large-diameter blade and the small-diameter blade. 2. A pump body having a suction port at a lower end and a discharge port at an upper side surface, a rotating body rotatably housed in the pump body, and a motor for rotating the rotating body. made, the rotating body is provided with a shaft portion connected to an output shaft of the motor, a plate-shaped blade <br/> roots provided radially from the shaft portion, the output shaft direction in the lower portion of the wing was a plate-like
Drainage pump, comprising a blade root, and a disc having a hollow portion between the both blades. 3. A suction port is provided at a lower end portion, and a discharge port is provided at an upper side surface.
A pump body provided with a port , and a rotating body rotatably housed in the pump body.
And a motor for rotating the rotating body, wherein the rotating body has a shaft portion connected to an output shaft of the motor.
And a plate-shaped large diameter feather provided radially from the shaft part
Root and a plate-shaped plate provided in the output shaft direction below the large-diameter blade
Connect the small-diameter blade and the outer peripheral edge of the large-diameter blade on the small-diameter blade side.
And a disk having a hollow portion to be connected.
Drainage pump. 4. A suction port is provided at a lower end portion, and discharge is provided at an upper side surface.
A pump body provided with a port , and a rotating body rotatably housed in the pump body.
And a motor for rotating the rotating body, wherein the rotating body has a shaft portion connected to an output shaft of the motor.
And a plate-like wing provided in a radial direction from the shaft portion.
Root and a plate-like plate provided in the output shaft direction below this blade
Of the blade and the blade provided in the radial direction on the blade side.
A disk having a hollow portion connecting the outer peripheral portion
A drain pump. 5. A suction port is provided at a lower end, and discharge is provided at an upper side surface.
A pump body having a port, a rotating body rotatably housed in the pump body, and a motor for rotating the rotating body, wherein the rotating body is connected to an output shaft of the motor by a shaft portion.
And a plate-shaped member disposed on a plane including the axis of the shaft portion.
And a hollow portion disposed on a plane orthogonal to the axis.
And a plane including the axis below the blades
And a plate-like blade disposed on the same plane as
The board is disposed between the two blades.
Water pump. 6. A suction port is provided at a lower end portion, and a discharge port is provided at an upper side surface.
A pump body provided with a port , and a rotating body rotatably housed in the pump body.
And a motor for rotating the rotating body, wherein the rotating body has a shaft portion connected to an output shaft of the motor.
And a plate-shaped member disposed on a plane including the axis of the shaft portion.
And a hollow portion disposed on a plane orthogonal to the axis.
A disc having a
A plate-like plate arranged on the same plane as the plane on which the blades are arranged
A drain pump comprising a blade. 7. A suction port is provided at a lower end portion, and a discharge port is provided at an upper side surface.
A pump body provided with a port , and a rotating body rotatably housed in the pump body.
And a motor for rotating the rotating body, wherein the rotating body has a shaft portion connected to an output shaft of the motor.
And a blade disposed on a plane including the axis of the shaft portion.
And the lower surface of the blade is disposed on the same plane as the above plane
The blade is disposed on a plane including the axis on the blade side.
A disk having a hollow portion connecting the outer peripheral edges of the blades.
Drain pump characterized by the fact that: 8. A suction port is provided at a lower end portion, and a discharge port is provided at an upper side surface.
A pump body having a port, a rotating body rotatably housed in the pump body, and a motor for rotating the rotating body, wherein the rotating body is connected to an output shaft of the motor by a shaft portion.
And a blade disposed on a plane including the axis of the shaft portion.
And a circle having a hollow portion disposed on a plane orthogonal to the axis.
Disposed on the same plane as the panel and the plane containing the axis below the blades
And the disk is disposed between the two blades.
Of the blades that are
The lower edge is tapered
Drainage pump. 9. The disk has a shape for receiving the lower edge.
9. A dish-shaped disk having
Drainage pump. 10. A curved surface whose diameter gradually increases.
A pump chamber having a bottom surface
Provided on the large-diameter side of the pump chamber
A pump body having a discharge port, a rotating body rotatably accommodated in the pump body, and a motor for rotating the rotating body, wherein the rotating body is connected to an output side of the motor by a shaft portion.
And a blade disposed on a plane including the axis of the shaft portion.
And a hollow portion disposed on a plane orthogonal to the axis.
And the same plane as that containing the axis below the blades
A blade disposed on a plane, wherein the disk is
Disposed on a plane that includes
The lower edge portion is formed in a tapered shape, and the taper is
Match the taper shape on the bottom of the pump chamber
A drain pump.