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Pump

Inactive Publication Date: 2008-05-15
NIDEC SHIBAURA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]The present invention relates to a pump having a structure in which a metallic cover is attached to a case, which is formed of a resin material, so as to increase the durability of the pump having therein the case. Also, the present invention relates to the pump having a structure in which a reinforcement board is provided to the case so as to increase the durability of the case inside the pump. The present invention improves, without any significant increase in weight and a production cost thereof, hydraulic pressure resistance of the pump thereby increasing the durability of the pump.
[0017]Further, since the metallic cover is attached to a resin mold compound having molded therein an armature, the durability of the resin mold compound will be increased.

Problems solved by technology

However, forming a metal plate into a three-dimensional case by methods such as pressing and welding will be a difficult task.
Further, the pressing process is a costly process.
Furthermore, such pump requires countermeasures against increased weight thereof and corrosion.
When the pressure within the pump is increased, due to thin resin layers at the contact portion 136, the resin mold compound 133 may be damaged (e.g., occurrences of crack).
Then, a weld line having a weak connection is likely to be cracked and, thus, water leakage of the pump 100 may occur.

Method used

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first embodiment

[0028]FIG. 1 is a diagram showing a schematic cross sectional view in an axial direction of a pump 10 according to a first embodiment of the present invention. FIG. 2 is a plan view of FIG. 1. As shown in FIG. 1, the pump 10 comprises: an upper case 11 and a lower case 12, which are formed of a resin material; a rotor 21 which rotates around a predetermined central axis J1, and which is located in a space generated between the upper case 11 and the lower case 12 which are joined together; and a ring shaped stator 22 which is located along an outer circumference of the rotor 21 and outside of the lower case 12. The pump 10 is commonly referred to as a canned type pump wherein the lower case 12 is provided between the rotor 21 and the stator 22. Note that, in the description of the preferred embodiments of the present invention herein, words such as upper, lower, left, right, upward, downward, top, and bottom for describing positional relationships between respective members and direc...

second embodiment

[0041]Next, a pump according to a second embodiment of the present invention will be described with reference to FIG. 3. FIG. 3 is a diagram showing a plan view, as seen from a side of, a pump according to a second embodiment of the present invention. In FIG. 3, elements similar to those illustrated in FIG. 1 are denoted by similar reference numerals, and description thereof is omitted.

[0042]In the first embodiment, the metallic cover 1 covers over only the top surface in the axial direction of the upper case 11. In the second embodiment, however, a metallic cover is provided on both top and bottom surfaces of a pump 70 so as to sandwich, and to provide additional durability, to the pump 70. That is, according to FIG. 3, a metallic cover 71 which covers over a top surface of the upper case 11 and a resin mold compound side metallic cover 72 which covers over a bottom surface of the resin mold compound 33 are provided on the upper case 11. The metallic cover 71 and the resin mold com...

third embodiment

[0047]FIG. 4 is a diagram showing a schematic cross sectional view in the axial direction of a pump 50 according to a third embodiment of the present invention. FIG. 5 is an enlarged view of a portion A shown in FIG. 4. As shown in FIG. 4, the pump 50 is a canned type pump, wherein the pump 50 has a common structure as the pump 10 according to the first embodiment. In FIG. 4, elements similar to those illustrated in FIG. 1 are denoted by similar reference numerals, and the description of the structure of the pump 50 is omitted.

[0048]The pump 50 according to the third embodiment comprises a stator 22 including an annular shaped resin mold compound 34 having therein the molded resin 32 in which the armature 30 and the printed circuit board 31 are provided. In the armature 30, the ring shaped laminated core 29 and the coil 29a are provided.

[0049]The resin mold compound 34 includes therein an annular shaped reinforcement board 5 which is formed of a metal plate. The reinforcement board ...

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Abstract

In a pump having a rotor inside a pump chamber which is formed inside a case which is formed of a resin material, and a resin mold compound in which an armature is molded with resin, a metallic cover is provided on a portion of an outer surface of the case inside the pump, wherein the portion has inferior durability compared with the rest of the outer surface.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field[0002]The present invention relates to pumps, and more particularly to a pump having improved hydraulic pressure resistance by increasing the durability of the exterior and interior of the pump, having therein a case formed of a resin material.[0003]2. Description of the Related Art[0004]There is a growing demand for a device such as a water heater to become smaller in dimensions, lighter in weight and energy efficient. Such demand is also expected of a pump installed in the aforementioned device or the like.[0005]A pump in general comprises a DC brushless motor having a rotor which is sealed inside a case, a stator affixed outside the case for driving the rotor, and an impeller which is connected to the rotor and is located in a pump chamber therein.[0006]FIG. 8 is a diagram showing a schematic cross sectional view in an axial direction of an example of a conventional pump. As shown in FIG. 8, a pump 100 has arranged therein a roto...

Claims

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Application Information

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IPC IPC(8): F04D29/40
CPCF04D29/426F04D29/026F05D2300/222F05D2300/43F05D2300/615
Inventor SAWASAKI, MOTOIKAWASHIMA, TAKENORINISHIMURA, MASASHI
Owner NIDEC SHIBAURA CORP
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