JPH07336946A - Water cooled stator frame - Google Patents

Abstract

(57) [Summary] [Purpose] There is no risk of water leakage in the stator frame, a watertight test is unnecessary, the number of parts is small, and there is no fear of deterioration over time such as packing. [Structure] A stator frame main body 2 for fixing a stator 1 has a shape in which a concentric inner cylinder 3 and an outer cylinder 4 having the same axial length are connected by a plurality of axial ribs 5. And the stator frame body 2
Is formed by extruding the inner cylinder 3, the outer cylinder 4, and the rib 5 with an aluminum alloy. Notches 9 are provided at both ends of the rib 5 alternately and alternately in the circumferential direction. The annular end plates 6 are welded or brazed to the entire circumferences of both end surfaces of the inner cylinder 3 and the outer cylinder 4. The water supply port 7 and the drainage port 8 are opened at positions where the ribs 5 of the outer cylinder 4 are cut out. The rotor 11, the shaft 12, the bearing 13, and the bracket 14 have known structures.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a stator frame of a rotary electric machine having a concentric double structure and cooling water (including other refrigerants).
The same shall apply in this specification) to a water-cooled stator frame.

[0002]

2. Description of the Related Art FIG. 5 is a one-sided sectional view of a conventional example. In the figure, a stator frame 51 that fixes the stator 1 connects a concentric inner cylinder 52 and an outer cylinder 53 with a plurality of axial ribs 54, and opens a water supply port 55 and a drain port 56 in the outer cylinder. And rib 5
The notches 57 are provided at both ends of 4 alternately and alternately in the circumferential direction. An annular end plate 59 is brought into contact with the entire circumferences of both end surfaces of the inner cylinder 52 and the outer cylinder 53 via a packing 58, and the bolt 6
Connect with 0. Then, the inner cylinder 52, the outer cylinder 53, and the ribs 54
And are formed by casting or welding. The rotor 11, the shaft 12, the bearing 13, and the bracket 14 have known structures.

[0003]

The above-mentioned conventional example has the following problems. The main body of the stator frame 51 has a casting cavity in casting, or has a defective weld in welding, which may cause water leakage, and a watertight test is also required. The annular end plate 59 and the packing are separate parts from the main body of the stator frame 51, and the number of parts is large. A watertight test is required after the packing 58 is attached, and the packing deteriorates with time.

The object of the present invention is that there is no risk of water leakage of the stator frame, a watertightness test is unnecessary, the number of parts is small, and
An object of the present invention is to provide a water-cooled stator frame that does not have the risk of deterioration over time, such as packing.

[0005]

A water-cooled stator frame according to a first aspect of the present invention connects an inner cylinder and an outer cylinder, which have the same axial length and are concentric, with a plurality of axial ribs to form an inner cylinder and an outer cylinder. Extruded rib and aluminum alloy, welded or brazed annular end plates on the entire circumference of both end faces of the inner and outer cylinders, open the water supply port and drain port on the outer cylinder, and stagger at both ends of the rib. In addition, every other notch is provided in the circumferential direction.

In the water-cooled stator frame of the second aspect of the invention, the inner cylinder and the outer cylinder, which have the same axial length and are concentric, are connected by a plurality of axial ribs, and the inner cylinder, the outer cylinder and the rib are made of aluminum alloy. Extrusion molding, welding or brazing annular end plates on the entire circumference of both end faces of the inner cylinder and outer cylinder, opening the water supply port and the drain port in the outer cylinder, and on the inner surface facing the ribs of the annular end plates at both ends. Alternately, every other recess is provided in the circumferential direction.

A third aspect of the present invention is the first or second aspect of the invention, wherein the water supply port or the drainage port is provided by notching a rib, and the fourth aspect of the invention is the first or second aspect of the invention, the water supply port or the drainage port is provided between the ribs. It is a thing.

[0008]

According to the invention 1, since the stator frame main body is formed by extruding the inner cylinder, the outer cylinder and the ribs with an aluminum alloy, there is no risk of water leakage and a watertight test is unnecessary.
The number of parts is small and the cost is low. Since the annular end plates are welded or brazed to the entire circumferences of both end surfaces of the inner cylinder and the outer cylinder, automation is possible, and a watertight test such as packing attachment is unnecessary and there is no possibility of deterioration over time. The cooling water meanders between the ribs and the notch, and is passed from the water supply port to the drainage port.

According to the second aspect of the invention, there is no risk of water leakage of the stator frame body, no water tightness test is required, the number of parts is small and the cost is low, and the welding or brazing of the annular end plate can be automated. As in the case of the invention 1, a watertightness test such as mounting of a packing is unnecessary and there is no fear of deterioration with time.
The cooling water meanders between the ribs and the recess, and is passed from the water supply port to the drainage port.

According to the invention 3 or 4, the position where the water supply port or the drain port is provided can be selected.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a one-sided sectional view including a hidden line drawing of an essential part of the first embodiment, FIG. 2 is a longitudinal sectional view of FIG. 1, and FIG. 3 is a perspective sectional view of the essential part of FIG. 4 is the same as FIG. 3 of the second embodiment.
It is a perspective sectional view corresponding to. In the conventional example and the drawings, components having the same reference numerals are substantially the same members, and redundant description may be omitted.

In the first embodiment of FIGS. 1, 2 and 3,
The stator frame body 2 for fixing the stator 1 has a shape in which a concentric inner cylinder 3 and an outer cylinder 4 having the same axial length are connected by a plurality of axial ribs 5. The stator frame body 2 is formed by extruding the inner cylinder 3, the outer cylinder 4, and the ribs 5 with an aluminum alloy. Notches 9 are provided at both ends of the rib 5 alternately and alternately in the circumferential direction. The annular end plates 6 are welded or brazed to the entire circumferences of both end surfaces of the inner cylinder 3 and the outer cylinder 4. The water supply port 7 and the drainage port 8 are opened at positions where the ribs 5 of the outer cylinder 4 are cut out. The rotor 11, the shaft 12, the bearing 13, and the bracket 14 have known structures.

According to the first embodiment, the stator frame main body 2 is formed by extruding the inner cylinder 3, the outer cylinder 4 and the ribs 5 with an aluminum alloy. It is necessary, has a small number of parts, and is inexpensive. Inner cylinder 3
Since the annular end plates 6 are welded or brazed to the entire circumferences of both end surfaces of the outer cylinder 4, automation is possible, and a watertight test such as packing attachment is unnecessary and there is no fear of deterioration over time. The cooling water meanders between the ribs 5 and the notch 9 as shown by the arrow, and is passed from the water supply port 7 to the drainage port 8.

The second embodiment of FIG. 4 differs from the first embodiment in that
This is that recesses 29 are provided alternately on the inner surface facing the rib 5 of the annular end plates 26 at both ends, and alternate recesses 29 are provided in the circumferential direction, and a water supply port 27 and a drain port (not shown) are provided between the ribs 5. The cutout portion 9 of the first embodiment may not be provided in the second embodiment. According to the second embodiment, it is not necessary to process the notch 9 of the rib 5 in the stator frame body 2 to be extruded, and the recess 29 of the annular end plate 26 can be integrally formed when the annular end plate 26 is formed. The cooling water flows between the ribs 5 and the recess 29 as shown by the arrow.
Water is passed from the water supply port 7 to the drain port.

[0015]

According to the water-cooled stator frame of the invention 1 or 2, there is no risk of leakage of water from the stator frame body, a watertightness test is unnecessary, the number of parts is small, and the cost is low. Welding or brazing can be automated, and there is no need for a watertight test such as packing attachment, and there is no fear of deterioration over time. According to the invention 3 or 4, there is an effect that the position where the water supply port or the drainage port is provided can be selected.

[Brief description of drawings]

FIG. 1 is a one-sided cross-sectional view including a hidden line drawing of a main part of a first embodiment.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a perspective cross-sectional view of circumferential development of the main part of FIG.

FIG. 4 is a perspective sectional view corresponding to FIG. 3 of the second embodiment.

FIG. 5 is a one-sided sectional view of a conventional example

[Explanation of symbols]

1 Stator 2 Stator Frame Main Body 3 Inner Cylinder 4 Outer Cylinder 5 Rib 6 Annular End Plate 7 Water Supply Port 8 Drainage Port 9 Notch 11 Rotor 12 Shaft 13 Bearing 14 Bracket 26 Annular End Plate 29 Recess

Claims (4)

[Claims] 1. An inner cylinder and an outer cylinder having the same axial length and concentric with each other are connected by a plurality of axial ribs, and the inner cylinder, the outer cylinder and the ribs are extruded from an aluminum alloy to form an inner cylinder. Weld or braze annular end plates on the entire circumference of both end faces of the outer cylinder, open the water supply port and the drain port on the outer cylinder, and stagger the ribs at both ends alternately in the circumferential direction. A water-cooled stator frame characterized by being provided. 2. An inner cylinder and an outer cylinder, which have the same axial length and are concentric, are connected by a plurality of axial ribs, and the inner cylinder, the outer cylinder and the ribs are extruded from an aluminum alloy to form an inner cylinder. Annular end plates are welded or brazed on the entire circumference of both end faces of the outer cylinder, the water supply port and the drain port are opened in the outer cylinder, and the inner faces facing the ribs of the annular end plates on both ends are staggered in the circumferential direction. A water-cooled stator frame, characterized in that every other recess is provided. 3. The water-cooled stator frame according to claim 1 or 2, wherein the water supply port or the drain port is provided by cutting out a rib. 4. The water-cooled stator frame according to claim 1 or 2, wherein the water supply port or the drain port is provided between the ribs.