JP2001020889A - Magnet pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a motor body and to increase starting torque. SOLUTION: A magnet pump comprises a brushless DC motor 2; a casing 4 on which a brushless motor 2 is mounted and in which a passage 4b for water is formed; a magnet coupling 3 on the motor side mounted on the shaft of the brushless DC motor 2 and provided with a plate-form magnet 6; an impeller 5 contained in a casing 4; and a magnet motor 1 mounted on the back of the impeller 5 and consisting of a magnet coupling 3 on the motor side and a magnet coupling on the pump side situated opposite to the aforesaid magnet coupling through the arbitrary wall of the casing 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet pump driven by a magnetic coupling.

[0002]

2. Description of the Related Art A conventional pump will be described with reference to FIG. FIG. 3 is a side sectional view of a conventional magnet pump.

In FIG. 3, a magnet pump 21 comprises
It has an induction motor 22 which is a driving source of the pump, a motor-side magnet coupling 23 attached to a shaft end of the induction motor 22, and a side flat portion 24a for attaching the induction motor 22, and water flows inside. The casing 24 includes a casing 24 in which a water passage 24b is formed, and an impeller 25 housed in the casing 24.

The motor-side magnet coupling 23 is provided with a plate-like magnet 26.

[0005] A magnet 27 having the same shape as the magnet 26 of the motor-side magnet coupling 23 is provided on the back of the impeller 25 to constitute a pump-side magnet coupling 28. The magnet 27 of the pump-side magnet coupling 28 and the magnet 26 of the motor-side magnet coupling 23 are provided to face each other with the wall of the side plane portion 24 a of the casing 24 interposed therebetween.

The impeller 25 is mounted on the casing 24 via a bearing 29.

[0007]

In the conventional pump as described above, if an induction motor is used as a driving source, the motor efficiency is not good, so that the required power must be increased to increase the volume of the motor body. In addition, since the coefficient of friction between the impeller and the bearing before the impeller starts rotating is large, the rotation of the induction motor having a small starting torque cannot be smoothly started.

[0008]

According to the present invention, there is provided a brushless DC motor, a casing having the brushless DC motor mounted therein and having a water passage formed therein, and a shaft of the brushless DC motor. A motor-side magnet coupling provided with a plate-shaped magnet, an impeller housed in the casing, and a motor-side magnet coupling and an arbitrary wall of the casing attached to the back of the impeller. And a pump-side magnet coupling provided so as to face through the magnet pump.

The brushless DC motor is driven on a side surface of the brushless DC motor on the casing side.
Alternatively, there is provided a magnet pump in which electronic components to be controlled are stored, an impeller is mounted on the back of the motor-side magnet coupling, and the electronic components are cooled by rotating the impeller.

[0010]

By using a brushless DC motor as a driving source for driving the pump, the starting torque is increased, and the impeller can be started smoothly. Further, by providing the motor-side magnet coupling with the impeller, the motor is cooled and the electronic components housed in the motor are also cooled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side sectional view of a magnet pump according to the present invention. FIG. 2 is an enlarged sectional view of an impeller unit attached to the motor-side magnet coupling of FIG.

In FIG. 1, a magnet pump 1 includes a brushless DC motor 2 which is a driving source of the pump, a motor-side magnet coupling 3 attached to a shaft end of the brushless DC motor 2, and a brushless DC motor 2.
The casing 4 includes a casing 4 having a side flat surface portion 4a for attachment and a water passage 4b through which water passes, and an impeller 5 housed in the casing 4.

The motor-side magnet coupling 3 includes:
A plate-shaped magnet 6 and an impeller 8 attached to the back of the magnet 6 for cooling an electronic component 7 housed on the side of the brushless DC motor 2 are provided.

A magnet 9 having the same shape as the magnet 6 of the motor-side magnet coupling 3 is provided on the back surface of the impeller 5.
Is composed. The magnet 9 of the pump-side magnet coupling 10 and the magnet 6 of the motor-side magnet coupling 3 are provided to face each other with the wall of the side flat portion 4a of the casing 4 interposed therebetween. In addition, impeller 5
Is mounted on the casing 4 via a bearing 11.

When the brushless DC motor 2 is driven, the motor-side magnet coupling 3 rotates. Then, a magnet 9 provided opposite to the magnet 6 attached to the motor-side magnet coupling 3 rotates in conjunction with the magnet 6. That is, the impeller 5 rotates and the water in the casing 4 flows. When the impeller 5 starts rotating, a gap is formed in the contact surface between the impeller 5 and the bearing 11, and water enters the gap. That is, before the impeller 5 starts rotating, the friction between the impeller 5 and the bearing 11 is large,
In order to rotate the impeller 5, a large starting torque is required for the motor. Therefore, by using the brushless DC motor 2 having a large starting torque, the impeller 5
Can start rotating smoothly.

In FIG. 2, when the brushless DC motor 2 is driven, the motor-side magnet coupling 3 rotates. At this time, the impeller 8 also rotates in conjunction with the air to flow, and cools the electronic component 7 provided on the opposite surface of the impeller 8.

[0017]

According to the present invention, the size of the motor body can be reduced and the starting torque can be increased by using a brushless DC motor having high motor efficiency.

Further, by mounting the impeller on the magnet coupling and storing the electronic components on the side of the casing of the brushless DC motor, the electronic components can be cooled.

[0019]

[Brief description of the drawings]

FIG. 1 is a side sectional view of a magnet pump according to the present invention.

FIG. 2 is an enlarged sectional view of an impeller mounted on the motor-side magnet coupling of FIG. 1;

FIG. 3 is a side sectional view of a conventional magnet pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 21 ... Magnet pump 2 ... Brushless DC motor 3, 23 ... Motor side magnet coupling 4, 24 ... Casing 5, 25 ... Impeller 6, 9, 26, 27 ... Magnet 7 ... Electronic components 8 ... Impeller 10, 28 ... Magnet coupling on pump side 11, 29 ... Bearing 22 ... Induction motor

Claims (2)

[Claims] 1. A brushless DC motor, a casing having the brushless DC motor mounted therein and having a water passage formed therein, and a motor mounted on a shaft of the brushless DC motor and provided with a plate-shaped magnet. A side magnet coupling; an impeller housed in the casing; and a pump side magnet cup mounted on the back of the impeller and provided opposite the motor side magnet coupling and an arbitrary wall of the casing. A magnet pump comprising: a ring; 2. An electronic component for driving or controlling the brushless DC motor is housed in a side surface portion on a casing side of the brushless DC motor, and an impeller is attached to a back surface of the motor-side magnet coupling. 2. The magnet pump according to claim 1, wherein the electronic component is cooled by rotating a car.