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Pump

Pump description/claims

The present invention relates to a pump incorporating a claw pole type motor and, more particularly, to a technique of increasing a pump efficiency and reducing a pump size.

It is known that a pump for sucking and discharging, e.g., liquid, employs a claw pole type motor with claw-shaped magnetic poles as a motor for rotatingly driving an impeller (see, e.g., Japanese Patent Laid-open Application No. 2003-505648). The claw pole type motor is simple in structure and therefore is advantageous in that it can enjoy enhanced productivity and reduced production costs.

Typically, the pump includes an impeller for sucking and discharging liquid, a pump case with suction and discharge ports, a partition cooperating with the pump case to form a pump chamber in which the impeller is rotatably received, a rotor having a magnet for rotatingly driving the impeller and a stator having claw-shaped magnetic poles for applying a rotational driving force to the rotor. The rotor and the stator are liquid-tightly isolated from each other by means of the partition.

In this kind of pump, there have existed a demand for enhancement of a suction and discharge capacity (pump efficiency) and a demand for reduction in size.

In view of the above, the present invention provides a pump capable of assuring increased efficiency and reduced size.

In accordance with the present invention, there is provided a pump including: an impeller for sucking and discharging liquid; a pump case having a suction port and a discharge port through which the liquid is sucked and discharged; a partition cooperating with the pump case to form a pump chamber in which the impeller is rotatably received; a rotor having a magnet for rotatingly driving the impeller; and a stator having claw-shaped magnetic poles for applying a rotational driving force to the rotor, the rotor and the stator constituting a claw pole type motor that serves as a driving power source of the pump, wherein at least the stator is entirely coated with a molded resin.

In order to enhance pump efficiency and to reduce pump size in a pump using a claw pole type motor as its driving power source, a stator is entirely coated with molded resin or is formed of a dust core.

In accordance with the pump of the present invention, a stator is entirely coated with molded resin, whereby the heat of liquid sucked into a pump case through an suction port and the heat emitted from a motor (a rotor and a stator) are dissipated through the molded resin. This makes it possible to enhance pump efficiency. With the pump of the present invention, the molded resin acts to dissipate heat. This eliminates the need to additionally provide a cooling device, which assists in reducing the size of the pump itself.

With the pump of the present invention, the stator is formed of a dust core. This makes it possible to suppress generation of an eddy current and to reduce the loss of electric current, consequently increasing pump efficiency. Since the stator is formed of a dust core in the pump of the present invention, it is possible to reduce the thickness of the stator itself and, eventually, to reduce the size of the pump itself.

The object and features of the present invention will become apparent from the following description of embodiments given in conjunction with the accompanying drawings, in which:

FIG. 1 is a perspective view of a pump in accordance with a first embodiment of the present invention;

FIG. 2 is a section view taken along line A-A in FIG. 1;

FIG. 3 is a section view of a pump in accordance with a second embodiment of the present invention;

FIG. 4 is a section view of a pump in accordance with a fourth embodiment of the present invention;

FIG. 5 is a section view of a conventional pump in which magnetic poles are detected by a hall sensor; and

FIG. 6 is a section view of a pump in accordance with a fifth embodiment of the present invention.

• Provisional Patent
• Utility Patent

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