JPH08219091A - Motor-driven pumping device - Google Patents

Abstract

PURPOSE: To improve the cooling performance of an impeller by making air flow flow in an axial flow direction in a motor-driven pumping device provided with the impeller for cooling a motor for driving a pump. CONSTITUTION: A pump 16 for discharging water, flowing in from an inflow port 20, from an outflow port 21 by the rotation of a runner 17 is driven by a motor 18, and the motor 18 is cooled by an impeller 22. In the impeller 22, plural baldes 25 are disposed between a front face shroud 23 and a rear face shroud 24, and an intake port 26 is provided near the center part of the front face shroud 23. Each blade is disposed in such a way that the inner peripheral side end is positioned more on the inner peripheral side than the intake port 26, and the outer peripheral side end is obliquely cut so that the blade length on the intake port 26 side is long and the blade length on the exhaust port 27 side is short.

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 type has been used in, for example, a dishwasher, and the dishwasher was constructed as shown in FIG. The configuration will be described below.

As shown in the figure, a cleaning pump 1 is driven by a motor 2 and the cleaning water stored in a cleaning tank 3 is ejected from a cleaning nozzle 4 which is rotatably supported, and this cleaning water is set in a table basket 5. The washing water collected in the washing tank 3 is sprayed from the washing nozzle 4 again onto the tableware 6 thus prepared. The circulation of the wash water removes stains on the tableware 6.
Therefore, it is necessary to circulate the wash water many times, and the impeller 7 for cooling is used for cooling in order to reduce the temperature rise of the motor 2.

The drainage pump 8 is driven by a motor 9 and discharges the cleaning water in the cleaning tank 3 to the outside of the machine. Since a long drain pipe is required up to the drain port outside the machine,
The drainage pump 8 requires a high head. Therefore,
In order to reduce the temperature rise of the motor 9, the impeller 1 for cooling
It is cooled by 0.

In the electric pump device such as the washing pump 1 and the drainage pump 8 as described above, a plurality of impellers 7 are provided between a front shroud 11 and a rear shroud 12 having a bowl-shaped cross section, as shown in FIG. A blade 13 is arranged, and an intake port 14 is provided near the center of the front shroud 11 to form a centrifugal impeller. Also, the impeller 10
As shown in FIG. 9, a plurality of blades 15 were bent to form an axial flow type impeller.

[0006]

In the centrifugal impeller 7 having such a conventional structure as shown in FIG. 8, the front shroud 11 has a bowl-shaped cross-section, and an air flow is allowed to flow in the axial direction. However, when rotated, most of the airflow is made to flow in the centrifugal direction. In order to flow the air flow in the axial direction, the rotation speed of the impeller 7 may be adjusted. However, since the rotation axes of the cleaning pump and the impeller 7 are the same, the rotation speed of the impeller 7 should be adjusted. I can't. Further, in order to allow the air flow to flow in the axial direction, the shape of the impeller 7 may be made small. However, if the shape of the impeller 7 is made small, the absolute air flow rate for cooling the motor 9 becomes insufficient. Had.

Further, an axial flow type impeller 1 as shown in FIG.
0 allows the air flow to flow in the axial direction and can cool the motor 9, but the axial flow type impeller 10 needs to have a low pressure loss to allow the air flow. When it is used inside a dishwasher as shown in FIG. 7, there is a problem that the ventilation efficiency is deteriorated because the pressure loss becomes high in a place surrounded by other parts and there is not enough space. Was.

The present invention solves 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 the axial direction.

A second object of the invention is to achieve the above first object and to improve the blowing efficiency.

[0010]

In order to achieve the first object of the present invention, a pump for discharging water flowing from an inflow port from an outflow port by rotation of a runner, a motor for driving the pump, An impeller for cooling the motor, wherein the impeller has a plurality of blades arranged between a front shroud and a rear shroud, and an intake port is provided near a central portion of the front shroud. Is so that the end on the inner peripheral side is located on the inner peripheral side of the intake port, and the end on the outer peripheral side is obliquely cut so that the blade length on the intake port side is long and the blade length on the exhaust port side is short. This is the first means for solving the problem.

Further, in order to achieve the first object, a pump for discharging the water flowing in from the inflow port through the outflow port by the rotation of the runner, a motor for driving the pump, and an impeller for cooling the motor. The impeller is provided with a plurality of blades between the front shroud and the rear shroud, an intake port is provided near the center of the front shroud, and the cross-sectional shape of the outer periphery of the front shroud is The second L is a means for solving the second problem.

Further, in order to achieve the first object, the impeller of the above-mentioned second problem solving means is that a space is formed between the front shroud and the end of the blade. I am trying.

Further, in order to achieve the second object, the impeller of the second or the third means for solving the problems has a long blade and an intake port which are long so that the blade is located on the inner peripheral side of the intake port. The fourth problem solving means is to form a short blade having a length up to the vicinity.

Further, in order to achieve the second object, in the impeller of the fourth means for solving the problems, the width of the long blade is narrowed and a space is formed between the front shroud and the long blade. Is the fifth means for solving problems.

Further, in order to achieve the second object, the impeller of the fourth or fifth means for solving the problems is provided with a straightening vane gradually increasing from the outer peripheral side to the inner peripheral side on the rear shroud. This is the sixth means for solving the problem.

[0016]

According to the first means for solving the above problems, the present invention provides:
By shortening the blade length from the intake port to the exhaust port of the impeller, the centrifugal component of the air flow given by the rotation of the blade of the impeller can be reduced from the intake port to the exhaust port, and the rotation of the impeller Even if the number is not reduced, the airflow can be made to flow in the axial direction, and the cooling performance of the impeller can be improved.

Further, according to the second means for solving the problems, by making the cross-sectional shape of the front shroud substantially L-shaped, the shape of the outer peripheral portion of the front shroud can be made to coincide with the axial flow direction, and the air flow is axial Can be made to flow in the direction, and the cooling performance of the impeller can be improved.

Further, according to the third problem solving means, the centrifugal component of the air flow given by the rotation of the blade can be prevented from being given on the outer peripheral side of the blade by the space portion, and the air flow is caused to flow in the axial direction. Therefore, the cooling performance of the impeller can be improved.

Further, according to the fourth means for solving problems, the short blades can widen the blades in the vicinity of the intake port so as not to obstruct the inflow of the air flow, and the blowing efficiency can be improved.

Further, according to the fifth means for solving the problems, the space between the front shroud and the long blades causes the impeller to rotate at a high speed, thereby alleviating the coarse and dense flow of the airflow generated between the blades. It is possible to improve the ventilation efficiency.

Further, according to the sixth means for solving problems, the rectifying plate can efficiently capture the vortex generated at the intake port and cause the vortex to flow between the blades, thereby improving the blowing efficiency.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG.

As shown in the figure, the pump 16 fixes the runner 17 to the shaft 19 of the motor 18, rotates the runner 17 by the motor 18, and discharges the water flowing from the inflow port 20 from the outflow port 21. The impeller 22 uses the motor 18
A plurality of blades 25 are provided between the front shroud 23 and the rear shroud 24, and an intake port 26 is provided near the center of the front shroud 23. The blade 25 has an end on the inner peripheral side located on the inner peripheral side of the intake port 26, and has a long blade length on the intake port 26 side and a short blade length on the exhaust port 27 side on the outer peripheral side. Is cut diagonally.

To explain the operation in the above structure, the intake on the outer peripheral side of the blade 25 is cut diagonally so that the blade length on the intake port 26 side is long and the blade length on the exhaust port 27 side is short. The blade length becomes shorter from the opening 26 to the exhaust opening 27, and the centrifugal component of the air flow given by the rotation of the blade 25 becomes smaller from the intake opening 26 to the exhaust opening 27, so that the rotation speed of the impeller 22 is not reduced. Also, compared to the conventional centrifugal impeller,
The airflow can be made to flow in the axial direction, and the cooling performance of the impeller 22 can be improved.

Next, a second embodiment 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 thereof will be 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. There is. Front shroud 2
The outer peripheral portion 9 has a substantially L-shaped cross section.

The operation of the above structure will be described. Since the front shroud of the centrifugal impeller of the conventional structure has a bowl shape, its outer peripheral portion has an angle with the axial flow direction of the impeller. Therefore, it flowed in the centrifugal direction along the cross-sectional shape of the front shroud. The front surface shroud 29 of the present embodiment has a substantially L-shaped cross-section at the outer peripheral portion, so that the shape of the front shroud 29 at the outer peripheral portion matches the axial flow direction of the impeller 28. Therefore, the air flow can be made to flow in the axial direction. In addition,
If the shape of the outer peripheral portion of the front shroud has an angle in the direction opposite to that of the conventional example, the internal flow in the impeller is disturbed, which is not good.

Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the impeller 33 forms a space 35 between the front shroud 29 and the end of the blade 34.

The operation of the above structure will be described. By forming a space 35 between the front shroud 29 and the end of the blade 34 on the outer peripheral side of the impeller 33, the operation is given by the rotation of the blade 34 of the impeller 33. The centrifugal component of the air flow is not given on the outer peripheral side. Therefore, the air flow can be made to flow in the axial direction.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the drawing, the impeller 36 has an intake port 32 in which a blade is provided near the center of the front shroud 29.
It is formed by a long blade 37 that is elongated so as to be located on the inner peripheral side and a short blade 38 that is a length up to the vicinity of the intake port 32.

The operation of the above structure will be described. By forming a plurality of blades of the impeller 36 by a long blade 37 and a short blade 38, the intake port 3 of the impeller 36 is formed.
The blades in the vicinity of 2 are widened so that the inflow of the air flow is not obstructed. Therefore, the blowing efficiency of the impeller 36 can be improved.

If all of the short blades are used, the long blade 37 that has caught the vortex near the intake port 32 is eliminated, and the efficiency is rather deteriorated.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the above-mentioned fourth embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, in the impeller 39, the width of the long blade 40 is narrowed to form a space 41 between the front shroud 29 and the long blade 40.

The operation of the above structure will be described. By narrowing the width of the long blade 40 in the axial direction of the impeller 39 and forming a space 41 between the front shroud 29 and the long blade 40, the blade is By rotating the wheel 39 at a high speed, the coarse and dense air flow generated between the blades is alleviated. Therefore, the blowing efficiency of the impeller 39 can be improved.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the fifth embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the drawing, the impeller 42 is provided on the rear shroud 30 with a straightening plate 43 which gradually increases in height from the outer peripheral side to the inner peripheral side.

The operation of the above structure will be described. By providing the straightening plate 43 having a shape gradually increasing from the outer peripheral side to the inner peripheral side on the rear shroud 30 near the center of the impeller 42, It is possible to efficiently capture the vortex flow that is generated on the inner peripheral side of the long blade 40 due to the intake port 32 of 42 and to flow into the space between the blades. Therefore, the blowing efficiency of the impeller 42 can be improved.

If the blade is composed of only the long blade 40, the distance between the blades in the vicinity of the intake port 32 becomes narrow, so that the efficiency is rather deteriorated by using the straightening plate 43.

[0042]

As described above, the present invention is provided with a pump for discharging water flowing from the inflow port from the outflow port by the rotation of the runner, a motor for driving the pump, and an impeller for cooling the motor. The impeller has a plurality of blades arranged between a front shroud and a rear shroud, and an intake port is provided near the center of the front shroud. Since the blade is located on the inner side of the mouth, the blade on the intake side is long, and the edge on the outer side is cut obliquely so that the blade length on the exhaust side is short, the air given by the rotation of the blade The centrifugal component of the flow can be made small from the intake port to the exhaust port, so that the air flow can be made to flow in the axial direction compared to the conventional centrifugal impeller even without reducing the rotation speed of the impeller. Kill. Therefore, the cooling performance of the impeller can be improved.

Further, a pump for discharging the water flowing in from the inlet through the outlet by the rotation of the runner, a motor for driving the pump, and an impeller for cooling the motor are provided, and the impeller has a front shroud. A plurality of blades are arranged between the front shroud and the rear shroud, and an intake port is provided near the center of the front shroud, so that the outer peripheral portion of the front shroud has a substantially L-shaped cross-section. The shape of the outer peripheral portion can be made to match the axial flow direction, and the air flow can be made to flow in the axial flow direction. Therefore, the cooling performance of the impeller can be improved.

Further, in the impeller, since the space is formed between the front shroud and the end of the blade, the centrifugal component of the air flow given by the rotation of the blade is not given on the outer peripheral side of the blade. The airflow can be in the axial direction. Therefore, the cooling performance of the impeller can be further improved.

Further, since the impeller is formed by a long blade whose blade is elongated so as to be located on the inner peripheral side of the intake port and a short blade which is a length up to the vicinity of the intake port, the impeller near the intake port of the impeller is The blades can be widened so as not to obstruct the inflow of air flow. Therefore, the blowing efficiency of the impeller can be improved, and the cooling performance can be further improved.

Further, in the impeller, since the width of the long blades is narrowed and a space is formed between the front shroud and the long blades, the impeller rotates at a high speed, and the air flow generated between the blades is reduced. Since the dense and dense flow is alleviated, the air blowing efficiency of the impeller can be improved and the cooling performance can be further improved.

Further, since the impeller is provided with the flow straightening plate on the rear shroud which gradually increases in height from the outer peripheral side to the inner peripheral side, it is generated at the intake port of the impeller and is generated on the inner peripheral side of the long blade. The vortex flow that had been generated can be efficiently captured and flowed between the blades. Therefore, the blowing efficiency of the impeller can be improved, and the cooling performance can be further improved.

[Brief description of 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 sectional view of an impeller of an electric pump device according to a second embodiment of the present invention.

FIG. 3A is a sectional view of an impeller of an electric pump device according to a third embodiment of the present invention. FIG. 3B is a plan view of an impeller of the electric pump device.

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

FIG. 5 is a sectional view of an impeller of an electric pump device according to a fifth embodiment of the present invention.

FIG. 6A is a sectional view of an impeller of an electric pump device according to a sixth embodiment of the present invention. FIG. 6B is a plan view of an impeller of the electric pump device.

FIG. 7 is a sectional view of a conventional dishwasher equipped with an electric pump device.

FIG. 8A is a cross-sectional view of an example of an impeller of the electric pump device, and FIG. 8B is a plan view of an impeller of the electric pump device.

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

[Explanation 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 Exhaust Port

Claims (6)

[Claims] 1. A pump that discharges water that has flowed in from an inlet through an outlet by rotation of a runner, a motor that drives the pump, and an impeller that cools the motor,
The impeller is provided with a plurality of blades between the front shroud and the rear shroud, an intake port is provided near the center of the front shroud, and the blade is
An electric motor in which the end on the inner peripheral side is located on the inner peripheral side of the intake port, and the blade length on the intake port side is long and the blade length on the exhaust port side is short so that the outer peripheral end is obliquely cut. Pump device. 2. A pump for discharging water flowing from an inflow port from an outflow port 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 arranged between a front shroud and a rear shroud, an intake port is provided near the center of the front shroud, and a cross-sectional shape of an outer peripheral portion of the front shroud is substantially L-shaped. Electric pump device. 3. The electric pump device according to claim 2, wherein the impeller forms a space between the front shroud and the end of the blade. 4. The impeller according to claim 2, wherein the impeller is formed of a long blade that is long so that the blade is located on the inner peripheral side of the intake port and a short blade that is close to the intake port.
The electric pump device described. 5. The electric pump device according to claim 4, wherein in the impeller, the width of the long blade is narrowed to form a space between the front shroud and the long blade. 6. The electric pump device according to claim 4, wherein the impeller is provided on the rear shroud with a rectifying plate that gradually increases in height from the outer peripheral side to the inner peripheral side.