JPH11117899A - Motor-driven pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven pump device incorporating an impeller for cooling a motor for driving a pump, by improving the circulation of air in the impeller so as to enhance the degree of efficiency of air blow in order to enhance the cooling function of the impeller. SOLUTION: In this device, a pump for introducing water thereinto through an inlet port through the rotation of a runner, and for discharging the same through an outlet port, is driven by a motor which is cooled by an impeller 22. The impeller 22 has a plurality of blades 25 arranged between a front surface shroud 23 and a rear surface shroud 23, and is provided with a flow straightening plate 28 having an inclined part 27 in the intake port 26 in the vicinity of the center part of the front surface shroud 23, the inclined part 27 having a height which gradually increases from the upstream side to the downstream side in the rotating direction.

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 provided with an impeller for cooling a motor for driving a pump.

[0002]

2. Description of the Related Art Conventionally, this kind of electric pump device is used for a dishwasher, for example, 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, the circulation of the washing water is required many times, so that 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,
In order to reduce the temperature rise of the motor 9, the cooling impeller 1
Cooled by 0.

[0005] In such an electric pump device as the washing pump 1 and the drain pump 8, as shown in FIG. 8, a plurality of impellers 7 are provided between a front shroud 11 and a rear shroud 12 each having a bowl-shaped cross section. 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. In another conventional impeller 10, as shown in FIG. 9, a plurality of blades 15 are bent to form an axial-flow type impeller.

[0006]

With such a conventional configuration, the axial-flow type impeller 10 as shown in FIG. 9 can flow air in the axial flow direction and can cool the motor 9. ,
The axial flow impeller 10 needs to have low pressure loss in order to flow an air flow. When used inside a dishwasher as shown in FIG. 7, the surrounding area is surrounded by other parts, and the pressure loss increases in a place where there is not enough space,
There was a problem that the air blowing efficiency deteriorated.

A centrifugal impeller 7 as shown in FIG.
In the same way, the air flow was used in a space where there was not enough space, causing the air flow to be disrupted. Therefore, there is also a problem that a vortex is generated on the inlet side of the impeller 7 and the air flow does not efficiently enter between the blades 13. The cross-sectional shape of the front shroud 11 is bowl-shaped, and an air flow is devised to flow in the axial flow direction. However, the air flow flowing along the cross-sectional shape of the front shroud 11 due to the rotation of the impeller 7 is: As shown by an arrow A in FIG.

In addition, the component of the air flow in the centrifugal direction increases toward the outer peripheral side. Moreover, 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. For example, even if the vortex is discharged to the outside of the blade 13, the vortex stays near the exit of the impeller 7, thereby preventing the air flow from being efficiently circulated inside the impeller 7 and causing a reduction in the intake air volume.

In order to make the air flow in the axial flow direction,
The rotation speed of the impeller 7 may be adjusted, but the rotation speed of the impeller 7 cannot be adjusted because the rotation axes of the cleaning pump 1 and the impeller 7 are the same. In order to make the air flow in the axial flow direction, the shape of the impeller 7 may be reduced. However, if the shape of the impeller 7 is reduced, there is a problem that the absolute air flow rate for cooling the motor 9 becomes insufficient. Had.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to improve circulation of an air flow in an impeller to improve air blowing efficiency and improve cooling performance of the impeller.

[0011]

According to the present invention, in order to achieve the above object, a pump for discharging water flowing from an inlet through an outlet by rotation of a runner is driven by a motor,
The motor is cooled by the impeller. The impeller has a plurality of blades arranged between the front shroud and the rear shroud, and an inclined portion that gradually rises from the upper side to the lower side with respect to the rotation direction at the intake port near the center of the front shroud. Is provided with a rectifying plate having the following.

With this configuration, the vortex generated at the inlet side of the impeller can be efficiently removed by the rectifying plate provided at the intake port of the front shroud and having a slope gradually increasing from the upper side to the lower side with respect to the rotation direction. Therefore, the air can flow between the blades, the air blowing efficiency can be improved, and the cooling performance of the impeller can be improved.

As another means for achieving the above object, a space is provided between the front shroud and the end of the blade on the outer peripheral side of the impeller, and this space is provided from the upper side to the lower side in the rotation direction. A rectifying plate having an inclined portion that gradually increases toward the side is provided.

As a result, since the impeller rotates at 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, thereby being generated at the outer peripheral portion of the impeller. The eddy current can be efficiently caught and discharged to the outside of the blade, the air blowing efficiency can be improved, and the cooling performance of the impeller can be improved.

Further, as another means for achieving the above object, a rectifying plate having an inclined portion gradually increasing from the upper side to the lower side in the rotation direction is provided near the outer peripheral portion of the rear shroud of the impeller. It is a thing.

Thus, even if the vortex is discharged out of the blade, it stays near the exit of the impeller and efficiently catches the vortex.
The air can be discharged from the vicinity of the impeller outlet, the blowing efficiency can be improved, and the cooling performance of the impeller 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. The impeller has a plurality of blades disposed between a front shroud and a rear shroud, and has an intake port near a center portion of the front shroud from the upper side in the rotation direction. A straightening plate with a slope that gradually increases toward the lower side is provided, and a straightening plate with a slope that gradually increases from the upper side to the lower side with respect to the rotation direction provided in the intake port of the front shroud, The vortex generated on the inlet side of the impeller can be efficiently caught and flowed between the blades, improving the air blowing efficiency and improving the cooling performance of the impeller. That.

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 has a plurality of blades disposed between a front shroud and a rear shroud, and a space is provided between the front shroud and an end of the blade on the outer peripheral side of the impeller, and the space rotates. A straightening plate having an inclined portion gradually increasing from the upper side to the lower side with respect to the direction is provided, and a space is provided between the front shroud and the end of the blade on the outer peripheral side of the impeller, and this space is provided. Is provided with a straightening plate having an upwardly inclined portion facing the rotation direction, so that the impeller rotates at a high speed. Abrupt change in the axial flow direction allows the vortex generated on the outer periphery of the impeller to be efficiently caught and discharged outside the blade, improving the blowing efficiency and improving the cooling performance of the impeller. Can be improved.

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, and has a rectifying portion near the outlet of the blade that gradually increases from the upper side to the lower side with respect to the rotation direction. A plate is provided, and even if it is discharged outside the blade, the vortex that has stayed near the impeller outlet can be efficiently caught, can be discharged from near the impeller outlet, and the blowing efficiency can be improved, The cooling performance of the impeller can be improved.

[0020]

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

(Embodiment 1) As shown in FIG.
6, the runner 17 is fixed to the shaft 19 of the motor 18 and the runner 17 is rotated by the motor 18 so that
Is discharged from the outlet 21. Impeller 22
Is for cooling the motor 18 and includes a front shroud 23
A plurality of blades 25 are arranged between the front shroud 24 and the rear shroud 24, and an intake port 26 is provided near the center of the front shroud 23. As shown in FIG. 1, this impeller 22 has a flow straightening plate 28 having an inclined portion 27 that gradually increases from the upper side a to the lower side b with respect to the rotation direction c at the intake port 26.

The operation of the impeller 22 in the above configuration will be described. Like a dishwasher, it is used in places where there is not enough room because it is surrounded by other parts, causing turbulence in the air flow and causing the vortex generated at the inlet side of the impeller 22 to flow through the impeller 22. The air can efficiently flow along the inclined portion 27 of the current plate 28 provided in the intake port 26, can flow between the blades 25, can improve the blowing efficiency, and can improve the cooling performance of the impeller 22. Can be improved.

(Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIGS. 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 FIG. 3, the impeller 29 has a plurality of blades 32 disposed between a front shroud 30 and a rear shroud 31, and a front shroud 309 and a blade 32 on the outer peripheral side of the impeller 29. A space 33 is provided between the ends of the space 33, as shown in FIG.
A rectifying plate 35 having an inclined portion 34 that gradually increases from the upper side a to the lower side b with respect to the rotation direction c is provided.

The operation of the impeller 29 in the above configuration will be described. On the outer peripheral side of the impeller 29, the front shroud 30
A space portion 33 is provided between the end of the blade 32 and a rectifying plate 35 having an inclined portion 34 that gradually increases from the upper side a to the lower side b with respect to the rotation direction in the space portion 33. Since the impeller 29 rotates at 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 29, thereby efficiently reducing the vortex generated at the outer peripheral portion of the impeller 29. Caught well, can be discharged out of the blade 32, can improve the blowing efficiency,
The cooling performance of the impeller 29 can be improved.

(Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to FIGS. 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 FIG. 5, the impeller 36 has a plurality of blades 39 disposed between the front shroud 37 and the rear shroud 38, and as shown in FIG. A rectifying plate 41 having an inclined portion 40 that gradually increases from the upper side a to the lower side b with respect to the rotation direction c is provided.

The operation of the impeller 36 in the above configuration will be described. By providing a rectifying plate 41 having an inclined portion 40 that gradually increases from the upper side a to the lower side b in the rotation direction c near the outlet of the blade 39 of the impeller 36,
The vortex discharged outside the blade 39 and staying near the outlet of the blade 39 can be efficiently caught and discharged from the vicinity of the outlet of the impeller 36, and the air blowing efficiency can be improved. Cooling performance can be improved.

[0029]

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 gradually rises from an upper side to a lower side with respect to a rotation direction at an intake port near a central portion of the front shroud. Since the rectifying plate with the inclined portion was provided, it was generated at the inlet side of the impeller due to the rectifying plate provided at the intake port of the front shroud and gradually increasing from the upper side to the lower side with respect to the rotation direction. The vortex can be efficiently caught and flown between the blades, thereby improving the air blowing efficiency and improving the cooling performance of the impeller.

According to the second 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, and an impeller for cooling the motor The impeller has a plurality of blades disposed between the front shroud and the rear shroud, and a space is provided between the front shroud and the end of the blade on the outer peripheral side of the impeller. Since the straightening plate having a slope that gradually increases from the upper side to the lower side with respect to the rotation direction is provided in the space, the impeller rotates at high speed, so that the flow of air flow is centrifuged at the outer periphery of the impeller. Abruptly changing from the direction to the axial flow direction, the vortex generated at the outer periphery of the impeller can be efficiently caught and discharged to the outside of the blade, improving the blowing efficiency. , It is possible to improve the cooling performance of the impeller.

According to the third 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, and has a slope gradually increasing from the upper side to the lower side with respect to the rotation direction near the outlet of the blade. A rectifying plate with a section allows the vortex that stays near the impeller exit to be efficiently caught even when it is discharged outside the blade, and can be discharged from near the impeller outlet, improving the air blowing efficiency. Thus, the cooling performance of the impeller can be improved.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the electric pump device.

3A is a sectional view of an impeller of an electric pump device according to a second embodiment of the present invention. FIG. 3B is a plan view of the impeller of the electric pump device as viewed from the rear shroud direction.

FIG. 4 is a partially cutaway perspective view of the impeller of the electric pump device.

5A is a sectional view of an impeller of an electric pump device according to a third embodiment of the present invention. FIG. 5B is a plan view of the impeller of the electric pump device as viewed from a rear shroud direction.

FIG. 6 is a partially cutaway perspective view of the impeller of the electric pump device.

FIG. 7 is a cross-sectional view of a dishwasher and dryer equipped with a conventional electric pump device.

FIG. 8A is a cross-sectional view of an example of the impeller of the electric pump device. FIG. 8B is a plan view of the impeller of the electric pump device viewed from the rear shroud direction.

9A is a side view of another example of the impeller of the electric pump device. FIG. 9B is a plan view of the impeller of the electric pump device.

[Explanation of symbols]

 Reference Signs List 16 Pump 17 Runner 18 Motor 20 Inlet 21 Outlet 22 Impeller 23 Front shroud 24 Rear shroud 25 Blade 26 Intake port 27 Inclined part 28 Straightening 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 gradually rises from an upper side to a lower side with respect to a rotation direction at an intake port near a central portion of the front shroud. An electric pump device equipped with a straightening plate with an inclined part. 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 has a plurality of blades disposed between a front shroud and a rear shroud, and a space is provided between the front shroud and an end of the blade on the outer peripheral side of the impeller, and the space rotates. An electric pump device provided with a rectifying plate having an inclined portion that gradually increases from the upper side to the lower side in the direction. 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, and has a rectifying portion near the outlet of the blade that gradually increases from the upper side to the lower side with respect to the rotation direction. An electric pump device provided with a plate.