JP2002168189A - Outer rotor type submersible pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer rotor type submersible pump having a reduced weight by making a face-to-face dimension shorter than that of an inner rotor type submersible pump and the outer diameter of a motor frame as small as that of the inner rotor type submersible pump, and avoiding the overheat of a motor by efficiently cooling a motor stator. SOLUTION: The motor 8 consists of a rotor 6 fixed to a fixed main shaft 11 fixed to a pump casing 1 via an axially supporting portion 10 in a rotation impossible manner and the stator 7 rotatably supported by the fixed main shaft 11 via a bearing portion 12 and fixed to the inner face of the motor frame 2 arranged concentrically in a pump casing 1. Power is supplied to the stator 7 via a power receiving slip ring 14 mounted on the fixed main shaft 11 and a conductive brush 15 arranged in slide contact, therewith for rotating the stator 7, the motor frame 2 and an impeller 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an outer rotor type submersible pump.

[0002]

2. Description of the Related Art An inner rotor type submersible pump shown in FIG. 3 is conventionally known. In this submersible pump, a motor frame (electric motor frame) 2 is installed inside a cylindrical casing 1, and a main shaft 3 is arranged along an axial center of the shaft. The main shaft 3 is rotatably supported by the motor frame 2 via bearings 4A and 5A in bearing boxes 4 and 5 fixedly supported by the motor frame 2.
Further, the motor 8 is composed of a motor rotor 6 surrounding the outer periphery of the main shaft 3 and fixed so as to be integrally rotatable, and a motor stator 7 surrounding the outer periphery of the motor rotor 6 and fixed to the inner periphery of the motor frame 2. Further, the distal end side of the main shaft 3 is protruded from the electric motor frame 2 into the distal end side of the casing 1, and the impeller 9 is attached to the protruding distal end so as to be integrally rotatable.

However, in a structure in which the impeller 9 protrudes from the electric motor frame 2 as in the above-mentioned conventional inner rotor type submersible pump, the dimension L between the surfaces of the pump becomes long. Therefore, a long installation space in the axial direction is required,
Depending on the installation location, there is a risk that the installation may not be possible due to space restrictions, and there may be a case where use is restricted.

On the other hand, when the conventional inner rotor type submersible pump is built in a water shutoff door of a gate for opening and closing an irrigation gate and an intake gate, and used as a gate pump, the face-to-face dimension of the pump is reduced. The thickness of the water stop door increases corresponding to L, and the weight of the water stop door increases. For this reason, the cost of the water shutoff door body is increased, and a large-diameter elevating spindle and a large-sized opening / closing device are required.

Therefore, the applicant of the present invention has already proposed an outer rotor type submersible pump capable of reducing the axial dimension by eliminating the drawbacks of the conventional inner rotor type submersible pump (Japanese Patent Laid-Open No. 11-132180). Gazette). As shown in FIG. 4, this outer rotor type submersible pump is disposed along the axial direction of the cylindrical pump casing 1 along the axial direction thereof, and has a shaft support 1 opposed to the axial direction.
0.10, a fixed main shaft 11 that is non-rotatably supported by the pump casing 1, an electric motor stator 7 fixed around the outer periphery of the fixed main shaft 11, and a relative rotation surrounding the outer periphery of the electric motor stator 7. An electric motor 8 having a motor rotor 6 that is arranged so as to be able to rotate, and a motor main body 6 of the electric motor 8 which is fixed to the inner periphery and is rotated around a fixed main shaft 11 via bearings 12, 12 facing each other in the axial direction. The motor frame 2 includes a motor frame 2 that is supported in a liquid-tight manner and is concentrically arranged in the pump casing 1 and houses a motor 8, and an impeller 9 fixed to the outer peripheral surface of the motor frame 2.

According to this type of outer rotor submersible pump, the inter-plane dimension L1 can be made shorter than the inter-plane dimension L of the inner rotor submersible pump shown in FIG.

[0007]

However, the outer rotor type submersible pump shown in FIG. 4 has a stator core which is wound around a primary coil to form a magnetic circuit, and a stator which forms a rotating magnetic field as a primary coil. Since the motor stator 7 including the coil is fixed to the outer periphery of the fixed main shaft 11, if the rated output of the motor 8 is the same as the motor 8 of the inner rotor type submersible pump shown in FIG. The radial dimension of the motor stator 7 of the pump is larger than the radial dimension of the motor rotor 6 of the inner rotor type submersible pump, and the outer diameter D1 of the motor frame 2 is larger than the motor frame 2 of the inner rotor type submersible pump. And the impeller 9 also becomes larger. For this reason, the pump weight becomes heavier than that of the inner rotor type submersible pump. Therefore, when this outer rotor type submersible pump is incorporated in a water shutoff door of a gate for opening and closing an irrigation gate or an intake gate, and is used as a gate pump, it corresponds to the shortened face-to-face dimension L1 of the pump. Since the thickness of the water stop door body is reduced, the weight of the water stop door body can be reduced and the cost of the water stop door body itself can be reduced, but the weight of the pump itself increases, so the gate pump equipment As a result, significant weight reduction cannot be expected.

On the other hand, in the outer rotor type submersible pump,
During operation, water passing through the annular passage 13 surrounded by the inner peripheral surface of the cylindrical pump casing 1 and the outer peripheral surface of the electric motor frame 2 cools the electric motor frame 2, and indirect water cooling in which the impeller 9 acts as a radiation fin. Although the electric motor 8 is cooled by this, the electric motor stator 7 having a large calorific value is located inside the electric motor frame 2 in the radial direction, so that the cooling efficiency is poor and a large cooling effect cannot be expected.

Accordingly, the present invention reduces the face-to-face dimension of the pump as compared with the conventional inner rotor type submersible pump, and makes the outer diameter of the motor frame as small as that of the inner rotor type submersible pump if the rated output of the motor is the same. It is an object of the present invention to provide an outer rotor type submersible pump that can reduce the weight of the pump and efficiently cool the stator for the motor having a large calorific value, thereby avoiding excessive heat generation of the motor. I have.

[0010]

In order to achieve the above object, an outer rotor type submersible pump according to the present invention is arranged at the axial center of a cylindrical pump casing along the axial direction thereof. A fixed main shaft that is non-rotatably supported by the pump casing via shaft supports opposed in the direction, a motor rotor fixed to the fixed main shaft surrounding the outer periphery of the fixed main shaft, and an outer periphery of the motor rotor. An electric motor including a motor stator that is disposed so as to be relatively rotatable around the motor; and a motor that is fixed to the inner periphery of the electric motor and rotatably and liquid-tightly fixed to the fixed main shaft through bearings that face each other in the axial direction. An electric motor frame supported and concentrically arranged in the pump casing to accommodate the electric motor; and an impeller fixed to an outer peripheral surface of the electric motor frame. A power receiving slip ring mounted around the fixed main shaft, and a conductive brush which is disposed so as to be slidably contactable with the power receiving slip ring and guides electric power received by the power receiving slip ring to the motor stator. The power supply to the power receiving slip ring rotates the motor stator to rotate the prime mover frame and the impeller.

According to the present invention, like the motor of the conventional inner rotor type submersible pump, the motor is composed of a motor rotor and a motor stator which is disposed so as to be rotatable around the outer periphery of the motor rotor. By rotating the motor stator around the outer periphery of the motor rotor fixed to the fixed main shaft, the motor frame and the impeller can be rotated to function as an outer rotor type submersible pump. For this reason, if the face-to-face dimension of the pump is shorter than that of the conventional inner rotor type submersible pump, and the rated output of the motor is the same as that of the conventional outer rotor type submersible pump motor, the outer diameter of the motor frame is changed to the inner rotor type submersible pump. It can be kept as small as the electric motor frame of the submersible pump. Further, since the motor stator having a large amount of heat generation is fixed to the inner periphery of the prime mover frame, it is possible to efficiently cool and avoid excessive heat generation of the motor.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. The same or corresponding parts as those of the conventional outer rotor type submersible pump shown in FIG.
The description is given with the same reference numerals.

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention. In this figure, the outer rotor type submersible pump is disposed along the axial direction of the cylindrical pump casing 1 along the axial direction thereof, and the pump casing 1 is disposed via the axial support 10.10 which faces in the axial direction. A fixed spindle 11 supported non-rotatably on the fixed spindle 11
A motor 8 having a motor rotor 6 fixed around the outer periphery of the motor and a motor stator 7 arranged to be relatively rotatable surrounding the outer periphery of the motor rotor 6, and a motor stator 7 of the motor 8 Which is rotatably and liquid-tightly supported on a fixed main shaft 11 via bearing portions 12 and 12 which are opposed to each other in the axial direction and which is concentrically arranged in the pump casing 1 and accommodates the motor 8. A frame 2 and an impeller 9 fixed to the outer peripheral surface of the motor frame 2 are provided. The impeller 9 is an annular passage 13 surrounded by the inner peripheral surface of the cylindrical pump casing 1 and the outer peripheral surface of the motor frame 2. It is located in.

On the other hand, the motor stator 7 includes a stator core that is wound around a primary coil to form a magnetic circuit, and a stator coil that forms a primary coil to generate a rotating magnetic field. As shown in FIG. 2, power is supplied to the power receiving slip ring 14 attached around the fixed main shaft 11 and the power receiving slip ring 14.
And three conductive brushes 15, 15, 15 for guiding the electric power received by the power receiving slip ring 14 to the electric motor stator 7, more specifically, to the stator coil of the electric motor stator 7. And made through.

The power receiving slip ring 14 includes three arc-shaped conductor pieces 14A, 14B, electrically insulated from each other.
14C is assembled into a cylindrical shape, and includes an electrically insulating ring 16 non-rotatably fitted to the fixed main shaft 11, and three electrically insulating arms 17 extending radially from the electrically insulating ring 16.
And is non-rotatably attached to the fixed main shaft 11 through the shaft.
In addition, the three conductive brushes 15, 15, 15 are respectively attached to the electrically insulating cylinders 18, 18, 18, which are individually mounted on the motor frame 2 at equal circumferential intervals. The power receiving slip ring 1 is housed so as to be able to slide in the axial direction of the power receiving slip ring 18 by the spring force of the conductive spring 20 interfering with the conductive spring stopper 19.
4 is constantly pressed and urged so as to be able to slide on the outer peripheral surface. Also, the conductive spring stopper 19 and the motor stator 7,
Specifically, the stator coils of the motor stator 7 are electrically connected through the conductive wires 21.

With such a configuration, the three arc-shaped conductor pieces 14A and 14A in the power receiving slip ring 14 are formed.
By electrically connecting B and 14C to a power supply as appropriate, the electric power received by these conductor pieces 14A, 14B and 14C is guided to the stator coil of the motor stator 7 to rotate the motor rotor 6. Works. However, the motor rotor 6 is non-rotatably mounted on the fixed main shaft 11, and the fixed main shaft 11 is supported by the axial support members 10.
Since the pump casing 1 is non-rotatably supported by the pump casing 10, the pump casing 1 is built into another member, for example, a water stop door of a gate that opens and closes an irrigation gate and an intake gate, and is firmly fixed. As a result, the electric motor stator 7 rotates, and at the same time, the motor frame 2 and the impeller 9 rotate to function as an outer rotor type submersible pump.

Therefore, the inter-plane dimension L2 is set to the inter-plane dimension L of the conventional inner rotor type submersible pump (see FIG. 3)
And the rated output of the motor 8 is the same as the motor 8 of the conventional outer rotor type submersible pump described in FIG. 4, the outer diameter D2 of the motor frame 2 is changed to the motor frame 2 of the inner rotor type submersible pump. , And the impeller 9 can be made smaller to reduce the pump weight. For this reason, when this outer rotor type submersible pump is built in the water shutoff door body of the gate that opens and closes the irrigation gate and the intake gate, when used as a gate pump, it corresponds to the reduced face-to-face dimension L2 of the pump. As the thickness of the water stop door is reduced, the weight of the water stop door can be reduced, and the cost of the water stop door can be reduced. A great reduction in weight can be expected.

On the other hand, the motor stator 7 having a large heat value
Is fixed to the inner periphery of the motor frame 2, so that when the outer rotor type submersible pump is operated, the water passing through the annular passage 13 surrounded by the inner peripheral surface of the cylindrical pump casing 1 and the outer peripheral surface of the motor frame 2. By cooling the motor frame 2 and indirect water cooling in which the impeller 9 acts as a radiation fin, the motor stator 7 can be efficiently cooled and excessive heat generation of the motor 8 can be avoided.

[0019]

As described above, since the outer rotor type submersible pump according to the present invention is constituted, the following special effects can be obtained.

That is, if the face-to-face dimension of the pump is shorter than that of the conventional inner rotor type submersible pump, and the rated output of the motor is the same as that of the conventional outer rotor type submersible pump motor, the outer diameter of the motor frame is changed to the inner diameter. The weight of the pump can be reduced by reducing the size of the impeller to a value as small as the electric motor frame of the rotor type submersible pump. For this reason, when this outer rotor type submersible pump is built into the water shutoff door of the gate that opens and closes the irrigation gate and the intake gate, and used as a gate pump, it corresponds to the shortened face-to-face dimension of the pump. Since the thickness of the water stop door body is reduced, the weight of the water stop door body can be reduced, and the cost of the water stop door body can be reduced. Weight reduction can be expected. Further, since the motor stator having a large amount of heat generation is fixed to the inner periphery of the prime mover frame, it is possible to efficiently cool and avoid excessive heat generation of the motor.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view showing a conventional inner rotor type submersible pump.

FIG. 4 is a longitudinal sectional view showing a conventional outer rotor type submersible pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical pump casing 2 Motor frame 6 Motor rotor 7 Motor stator 8 Motor 9 Impeller 10 Shaft support part 11 Fixed main shaft 12 Bearing part 14 Power receiving slip ring 15 Conductive brush

Claims (1)

[Claims] A fixed main shaft which is arranged along the axial direction of the cylindrical pump casing along the axial direction thereof, and which is non-rotatably supported by the pump casing via axially opposed shaft support portions; An electric motor comprising: an electric motor rotor surrounding the outer periphery of the fixed main shaft and fixed to the fixed main shaft; and an electric motor stator surrounding the outer periphery of the electric motor rotor and arranged to be relatively rotatable; and An electric motor frame that is rotatably and liquid-tightly supported on the fixed main shaft through bearings opposed to each other in the axial direction and is concentrically arranged in the pump casing and accommodates the electric motor. A power receiving slip ring provided with an impeller fixed to an outer peripheral surface of the electric motor frame and surrounding the fixed main shaft; and a power receiving slip ring. A conductive brush that is slidably disposed on the power receiving slip ring and guides the electric power received by the power receiving slip ring to the electric motor stator, and rotates the electric motor stator by supplying electric power to the electric power receiving slip ring. An outer rotor type submersible pump characterized in that the motor frame and the impeller are configured to rotate.