JPH10238458A - Motor-driven pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling performance of an impeller included in a motor-driven pump device for cooling a pump-driving motor, by directing airflow in the axial flow direction of a pump. SOLUTION: A pump 16, which sucks water by the rotation of its runner 17 through an inflow port 20 and discharges it through an outflow port 21, is driven by a motor 18, which is cooled down by an impeller 22. The impeller 22 involves a front shroud 23, a rear shroud 24, plural blades 25 interposed between those shrouds, a suction port 26 formed through the front shroud 23 in the center, and an airflow direction adjusting plate 27 extending from the outer periphery of the front shroud 23 toward the center of the impeller 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump device having an impeller for cooling a motor for driving a pump.

[0002]

2. Description of the Related Art Conventionally, an electric pump device of this kind has been used in, for example, a dishwasher, and the dishwasher is configured as shown in FIG. Hereinafter, the configuration will be described.

As shown in FIG. 1, a cleaning pump 1 is driven by a motor 2 and spouts cleaning water stored in a cleaning tank 3 from a rotatably supported cleaning nozzle 4. The cleaning water is set in a dish basket 5. The washing water collected in the washing tub 3 is applied to the washed dishes 6 and is ejected from the washing nozzle 4 again. The circulation of the washing water removes stains on the dishes 6.
Therefore, since the circulation of the washing water is required many times, the motor 2 is cooled by the cooling impeller 7 in order to reduce the temperature rise.

[0004] A drain pump 8 is driven by a motor 9 and discharges washing water in the washing tank 3 to the outside of the machine. Since long drain pipes are required up to the outboard drain,
The drain pump 8 requires a high head. Therefore, the motor 9 is cooled by the cooling impeller 10 in order to reduce the temperature rise.

In such electric pump devices as the washing pump 1 and the drain pump 8, as shown in FIG. 6, a plurality of impellers 7 are provided between a front shroud 11 having a bowl-shaped cross section and a rear shroud 12. The blades 13 are arranged, an intake port 14 is provided near the center of the front shroud 11, and the centrifugal impeller 7 is formed. As shown in FIG. 7, another conventional impeller 10 is formed by bending a plurality of blades 15 to form an axial-flow type impeller.

[0006]

With such a conventional structure, a centrifugal impeller 7 as shown in FIG. 6 has a front shroud 11 having a bowl-shaped cross section, and allows an air flow to flow in the axial flow direction. The air flow that has flowed along the cross-sectional shape of the front shroud 11 due to the rotation of the impeller 7 flows in a centrifugal direction when the air flow is separated from the impeller 7 as shown by an arrow A in FIG. . In addition, the component in the centrifugal direction of the airflow increases toward the outer peripheral side. In addition, since the impeller 7 rotates at a high speed, the flow of the air flow changes abruptly from the centrifugal direction to the axial flow direction at the outer peripheral portion of the impeller 7, so that a vortex is generated at the outer peripheral portion of the impeller 7. Occurs.

In order to make the air flow in the axial flow direction, the rotation speed of the impeller 7 may be adjusted. However, since the rotation axes of the cleaning pump 1 and the impeller 7 are the same, the rotation speed of the impeller 7 is Can not be adjusted. Further, in order to make the air flow in the axial flow direction, the shape of the impeller 7 may be reduced.
Has a problem that the absolute air flow for cooling the motor 9 is insufficient when the shape of the motor 9 is reduced.

Further, an axial flow type impeller 1 as shown in FIG.
0 indicates that the air flow can flow in the axial flow direction and the motor 9 can be cooled. However, the axial flow impeller 10 needs to have low pressure loss to flow the air flow. When used inside a dishwasher as shown in FIG. 5, there is a problem that the pressure loss is increased in a place where the surroundings are surrounded by other parts and there is not enough space, so that the blowing efficiency is deteriorated. Was.

The present invention has been made to solve the above-mentioned conventional problems, and has as its first object to improve the cooling performance of an impeller by causing an air flow to flow in an axial flow direction.

It is a second object of the present invention to achieve the first object and to improve the blowing efficiency.

[0011]

According to the present invention, in order to achieve the first object, a pump for discharging water flowing from an inlet through an outlet by rotation of a runner is driven by a motor, and the motor is driven by an impeller. To cool. The impeller has a plurality of blades disposed between the front shroud and the rear shroud, and an intake port is provided near a central portion of the front shroud, and an outer peripheral portion of the front shroud is provided in a direction toward the center of the impeller. The wind direction adjustment plate that extends is extended.

[0012] With this, the centrifugal component of the air flow given by the rotation of the blades of the impeller is caused to flow in the axial flow direction by the wind direction adjusting plate extending toward the center of the impeller extending to the outer peripheral portion of the front shroud. And the cooling performance of the impeller can be improved.

Further, as another means for achieving the first object, a plurality of holes are provided on the surface of the blade of the impeller,
The number of the holes increases toward the outer peripheral side of the impeller.

[0014] Thus, the centrifugal component of the air flow given by the rotation of the blade of the impeller can be reduced by the holes provided on the surface of the blade and increasing in number toward the outer peripheral side of the impeller, The air flow can flow in the axial flow direction, and the cooling performance of the impeller can be improved.

In order to achieve the second object, a plurality of projections or depressions are provided on the inner wall of the outer peripheral portion of the front shroud of the impeller.

[0016] Thus, generation of a vortex at the outer peripheral portion of the impeller can be suppressed by a plurality of projections or depressions provided on the inner wall of the outer peripheral portion of the front shroud, and the air flow can efficiently flow into the impeller. And the blowing efficiency can be improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, and cooling the motor. An impeller having a plurality of blades disposed between a front shroud and a rear shroud, an intake port provided near a central portion of the front shroud, and an outer periphery of the front shroud. The wind direction adjusting plate extending toward the center of the impeller is extended in the section, and the rotation speed of the impeller is reduced by the wind direction adjusting plate extending toward the center of the impeller extending around the outer periphery of the front shroud. Even without this, the centrifugal component of the airflow given by the rotation of the blades of the impeller can flow in the axial flow direction, and the cooling performance of the impeller can be improved.

According to a second aspect of the present invention, there is provided a pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, and an impeller for cooling the motor. The impeller arranges a plurality of blades between a front shroud and a rear shroud, provides an intake port near a central portion of the front shroud, and provides a plurality of holes in the surface of the blade, The number of holes increases as it goes to the outer peripheral side of the impeller, and the number of holes increases as it goes to the outer peripheral side of the impeller provided on the surface of the blade. The component in the centrifugal direction of the given airflow can be reduced, and the airflow can flow in the axial direction without reducing the rotation speed of the impeller, improving the cooling performance of the impeller. Rukoto can.

According to a third aspect of the present invention, there is provided a pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, and an impeller for cooling the motor. The impeller has a plurality of blades disposed between a front shroud and a rear shroud, an intake port is provided near a central portion of the front shroud, and a plurality of protrusions are formed on an inner wall of an outer peripheral portion of the front shroud. Alternatively, a plurality of projections or depressions provided on the inner wall of the outer peripheral portion of the front shroud cause the impeller to rotate at a high speed. Abruptly in the axial flow direction, the vortex that occurred at the outer periphery of the impeller can be suppressed, and the air flow can flow efficiently into the impeller. , It is possible to improve the blowing efficiency.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) As shown in FIGS. 1 and 2, a pump 16 includes a runner 17 and a shaft 19 of a motor 18.
Then, the runner 17 is rotated by the motor 18, and the water flowing from the inlet 20 is discharged from the outlet 21. The impeller 22 cools the motor 18, has a plurality of blades 25 disposed between the front shroud 23 and the rear shroud 24, and has an intake port 26 near the center of the front shroud 23. A wind direction adjustment plate 27 extending toward the center of the impeller 22 is provided on the outer peripheral portion of the front shroud 23.

The operation of the impeller 22 in the above configuration will be described. Since the wind direction adjusting plate 27 extending toward the center of the impeller 22 is extended around the outer periphery of the front shroud 23, the bowl-shaped front shroud 23 is rotated by the rotation of the impeller 22.
Does not flow in the centrifugal direction when leaving the impeller 22 by the wind direction adjusting plate 27, and the direction of the air flow coincides with the axial flow direction of the impeller 22. Therefore, the airflow can be made to flow in the axial flow direction without reducing the centrifugal component of the airflow given by the rotation of the blades 25 of the impeller 22 without decreasing the rotation speed of the impeller 22, and the impeller 22 is cooled. Performance can be improved.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIG. Since the pump and the motor for driving the pump are the same as those in the first embodiment, the description is omitted, and the impeller will be described.

As shown in the figure, the impeller 28 has a plurality of blades 31 disposed between a front shroud 29 and a rear shroud 30 and an intake port 32 provided near the center of the front shroud 29. I have. A plurality of holes 33 are provided on the surface of the blade 31, and the number of the holes 33 increases toward the outer peripheral side of the impeller 28.

The operation of the impeller 28 in the above configuration will be described. In the case where the holes 33 are not provided in the blade, the centrifugal component of the air flow increases toward the outer peripheral side. In the present embodiment, a plurality of holes 33 are provided on the surface of the blade 31, and the holes 33 move toward the outer peripheral side of the impeller 28,
By increasing the number, the ratio of the centrifugal component of the air flow given by the rotation of the blade 31 of the impeller 28 decreases as the component moves toward the outer peripheral side. Therefore, the air flow can be made to flow in the axial flow direction as compared with the conventional example without reducing the rotation speed of the impeller 28,
Cooling performance can be improved.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to FIG. Since the pump and the motor for driving the pump are the same as those in the first embodiment, the description is omitted, and the impeller will be described.

As shown in the figure, the impeller 34 has a plurality of blades 37 disposed between a front shroud 35 and a rear shroud 36 and an intake port 38 provided near the center of the front shroud 35. I have. Front shroud 3
A plurality of protrusions 39 are provided on the inner wall of the outer peripheral portion of No. 5.

The operation of the impeller 34 in the above configuration will be described. The plurality of protrusions 39 provided on the inner wall of the outer peripheral portion of the front shroud 35 cause the impeller 34 to rotate at a high speed.
By abruptly changing from the centrifugal direction to the axial flow direction, it is possible to suppress a vortex generated at the outer peripheral portion of the impeller. Also,
Separation of the generated eddy current is more likely to occur than in the conventional example,
As a result, the vortex is efficiently discharged out of the impeller 34. Therefore, the air flow is efficiently made to flow in the impeller 34, and the blowing efficiency can be improved.

In this embodiment, the front shroud 35
Although a plurality of projections 39 are provided on the inner wall of the outer peripheral portion, similar effects can be obtained by providing depressions instead of the projections 39.

[0030]

As described above, according to the first aspect of the present invention, a pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, An impeller for cooling the motor,
The impeller has a plurality of blades disposed between a front shroud and a rear shroud, and an intake port is provided near a central portion of the front shroud, and an outer peripheral portion of the front shroud has an impeller. Since the wind direction adjusting plate extending toward the center direction is extended, the wind direction adjusting plate extending toward the center direction of the impeller extending on the outer peripheral portion of the front shroud allows the blade of the impeller to be rotated without reducing the rotation speed of the impeller. The component in the centrifugal direction of the air flow given by the rotation can flow in the axial flow direction, and the cooling performance of the impeller can be improved.

According to the second aspect of the present invention, a pump for discharging water flowing from the inlet through the outlet by rotation of the runner, a motor for driving the pump, and an impeller for cooling the motor The impeller has a plurality of blades disposed between a front shroud and a rear shroud, an intake port is provided near a central portion of the front shroud, and a plurality of holes are provided on a surface of the blade. The number of holes increases toward the outer peripheral side of the impeller, so that the number increases as the number of holes increases toward the outer peripheral side of the impeller provided on the blade surface. The component in the centrifugal direction of the airflow given by the rotation can be reduced, and the airflow can flow in the axial direction without reducing the rotation speed of the impeller,
The cooling performance of the impeller can be improved.

According to the third aspect of the present invention, there is provided a pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, and an impeller for cooling the motor. The impeller has a plurality of blades disposed between a front shroud and a rear shroud, and an intake port is provided near a central portion of the front shroud, and an inner wall of an outer peripheral portion of the front shroud is provided. Since a plurality of protrusions or depressions are provided on the inner wall of the outer peripheral portion of the front shroud, the impeller rotates at high speed, so that the flow of air flow is centrifuged at the outer periphery of the impeller. The abrupt change from the direction to the axial flow direction can suppress the generation of the vortex that occurred on the outer periphery of the impeller, and allow the air flow to flow efficiently into the impeller. Can, it is possible to improve the blowing efficiency.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric pump device according to a first embodiment of the present invention.

FIG. 2 is a plan view of an impeller of the electric pump device.

FIG. 3 is a sectional view of an impeller of an electric pump device according to a second embodiment of the present invention.

4A is a sectional view of an impeller of an electric pump device according to a third embodiment of the present invention. FIG. 4B is a plan view of an impeller of the electric pump device.

FIG. 5 is a cross-sectional view of a dishwasher provided with a conventional electric pump device.

FIG. 6A is a cross-sectional view of an example of the impeller of the electric pump device. FIG. 6B is a plan view of the impeller of the electric pump device.

FIG. 7A is a side view of another example of the impeller of the electric pump device. FIG. 7B is a plan view of the impeller of the electric pump device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 16 Pump 17 Runner 18 Motor 20 Inlet 21 Outlet 22 Impeller 23 Front shroud 24 Rear shroud 25 Blade 26 Intake port 27 Wind direction adjusting plate

Claims (3)

[Claims] A pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, and an impeller for cooling the motor;
The impeller has a plurality of blades disposed between a front shroud and a rear shroud, and an intake port is provided near a central portion of the front shroud, and an outer peripheral portion of the front shroud has an impeller. An electric pump device with a wind direction adjustment plate extending toward the center. 2. A pump for discharging water flowing from an inlet through an outlet by rotation of a runner, a motor for driving the pump, and an impeller for cooling the motor.
The impeller arranges a plurality of blades between a front shroud and a rear shroud, provides an intake port near a central portion of the front shroud, and provides a plurality of holes in the surface of the blade, An electric pump device in which the number of holes increases toward the outer peripheral side of the impeller. 3. A pump for discharging water flowing from an inlet through an outlet by rotation of a runner from an outlet, a motor for driving the pump, and an impeller for cooling the motor.
The impeller has a plurality of blades disposed between a front shroud and a rear shroud, an intake port is provided near a central portion of the front shroud, and a plurality of protrusions are formed on an inner wall of an outer peripheral portion of the front shroud. Or an electric pump device with a recess.