JPH11178252A - Motor structure and closed compressed provided with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a main bearing and an auxiliary bearing to a case by welding the bearings to the case from the outside of a case while a uniform gap is maintained between a stator and a rotor and coaxiality is secured between the bearings by arranging the bearings in such a way that the positions of the corners of the bearings are aligned with the positions of the corners of the stator in the axial direction of a rotating shaft. SOLUTION: A polygonal main bearing 7 having the same number (four) of corners 7-1 to 7-3 as a stator 4 has at nearly regular intervals along the outer periphery and a polygonal auxiliary bearing having the same number (four) of corners 8-1 to 8-3 as the stator 4 has at nearly regular intervals along the outer periphery are arranged in such a way that the positions of the corners of the bearings are aligned with the corners of the stator 4 in the axial direction of a rotating shaft 6. The shaft 6 fitted with a rotor 5 is supported by the bearings at the central part of a case 1. The bearings are fixed to the case 1 by welding the bearings to the case 1 from the outside of the case 1. Therefore, the characteristics of a closed compressor, such as the freezing property, etc., can be improved, because a uniform gap can be maintained between the stator 4 and rotor 4 and coaxiality can be secured between the bearings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor structure and a hermetic compressor used for a refrigerator and an air conditioner provided with the same.

[0002]

2. Description of the Related Art Conventionally, a hermetic compressor 1A used in a refrigeration cycle of an air conditioner or the like has a structure shown in FIG. 3, for example. An electric element 2 and a compression element 3 are incorporated inside a cylindrical container (case) 1 having both ends closed. The electric element 2 includes a stator 4 fixed to the inner wall surface of the case 1 and a rotor 5 rotatably supported inside the stator 4, and a rotating shaft 6 is inserted through the rotor 5. Are combined. One end of the rotating shaft 6 is rotatably supported by a main bearing 7 constituting a part of the compression element 3, and the other end of the rotating shaft 6 is rotatably supported by a sub bearing 8. Then, the refrigerant gas is sucked into the compression element 3 through the suction pipe 9,
The refrigerant gas compressed by compressing the refrigerant gas is temporarily stored in the closed container 1.
It is discharged from the discharge pipe 10 after being discharged into the high-pressure space inside. In the hermetic compressor 1A, after assembling an electric motor structure including the case 1, the stator 4, the rotor 5, the rotating shaft 6, the main bearing 7, the auxiliary bearing 8, and the like, the compression element 3 and the like are mounted and both ends are closed. Manufactured. The stator 4 has, for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1 on its outer periphery.
A plurality of corners, such as two, have a polygonal shape with equal intervals, and the surfaces of the plurality of corners are fitted in the case 1 by shrink fitting or press fitting in contact with the inner wall of the case 1. In this way, the rotating shaft 6 with the rotor 5 extrapolated is inserted into the center of the case 1 on which the stator 4 is mounted so as to maintain an appropriate gap between the stator 4 and the rotor 5. The rotating shaft 6 is supported by the main bearings 7 and the sub bearings 8 at both ends while maintaining coaxiality, and the case 1 and both bearings are welded and fixed from the outside of the case 1 to assemble the motor structure. Case 1 in which stator 4 having a polygonal shape is shrink-fitted or press-fitted,
The shape of the inner surface of the case 1 is distorted from both ends of the case 1 along the surface of each corner of the stator 4 in contact with the inner wall of the case 1. If the shape or the position of the surface where the distorted case 1 and both or one of the two bearings contact do not match,
When welding the case 1 to which the stator 4 is shrink-fitted or press-fitted and the two bearings, the gap or press-fit allowance between the case 1 and the two bearings becomes uneven, so that a uniform gap between the stator 4 and the rotor 5 cannot be maintained. There was a problem that the coaxiality of the two bearings could not be secured.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to form a uniform stator 4 and rotor 5 using a case 1 in which a polygonal stator 4 having a plurality of corners at equal intervals on the outer periphery is shrink-fitted or press-fitted. An object of the present invention is to provide an electric motor structure in which both bearings are welded and fixed from the outside of a case 1 while maintaining a gap and maintaining the coaxiality of the two bearings, and a hermetic compressor equipped with the electric motor structure.

[0004]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a cylindrical case in which a polygonal stator having a plurality of corners at substantially equal intervals on the outer periphery is shrink-fitted or press-fitted. In the motor structure, a polygonal bearing having a plurality of corners equal to or less than the number of corners of the stator is attached to the outer periphery at substantially equal intervals, and the bearing supports a rotating shaft having a rotor extrapolated to the case. The corner position of the stator and the corner position of the bearing are arranged so as to match in the axial direction of the rotating shaft. A case in which a stator having a polygonal shape is shrink-fitted or press-fitted is distorted in shape along the surface of each corner of the stator in contact with the inner wall of the case. By making the positions of the corners of the bearings coincide in the axial direction of the rotating shaft, the gap between the stator and the rotor can be kept uniform, and the coaxiality of both bearings can be ensured.

According to a second aspect of the present invention, there is provided a hermetic compressor having the motor structure according to the first aspect. The hermetic compressor of the present invention having a motor structure in which the gap between the stator and the rotor is uniform and the coaxiality of both bearings is ensured is excellent in various characteristics such as refrigeration characteristics.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings shown in FIGS. FIG.
FIG. 2 is an explanatory sectional view showing an embodiment of the electric motor structure of the present invention, and FIG. 2 is an explanatory plan view of the electric motor structure of the present invention shown in FIG.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings shown in FIGS. FIG.
FIG. 2 is an explanatory cross-sectional view showing an embodiment of the electric motor structure of the present invention, and shows a cross section taken along line CC of FIG. FIG. 2 is an explanatory plan view of the motor structure of the present invention shown in FIG. 1 and 2, an electric motor structure 11 of the present invention includes a case 1, a stator 4, a rotor 5, a rotating shaft 6, a main bearing 7, an auxiliary bearing 8, and the like. The stator 4 has 4
A total of four corners of -1, 4-2, 4-3, and 4-4 have a polygonal shape with substantially equal intervals, and the surface of this corner contacts the inner wall of the case 1 in the case 1. They are shrink-fitted. FIG. 2A shows 4-1 of the stator 4;
The locations where the corners 4-2, 4-3, and 4-4 are in contact with the inner wall of the case 1 are shown.

[0010] As shown in FIG. 2, four corners 7-the same as the number of corners of the stator 4 are provided on the outer periphery at substantially equal intervals.
Polygonal main bearing 7 having 1, 7-2, 7-3, and 7-4, and four corners 8-1, which are the same as the number of corners of the stator at substantially equal intervals on the outer periphery, 8-2, 8 not shown −
3. A polygonal auxiliary bearing having an unillustrated 8-4 is disposed such that the position of each corner of the stator 4 and the position of each corner of both bearings coincide in the axial direction of the rotary shaft 6. FIG. 2B shows the main bearings 7-1, 7-2, 7-7.
-3 and 7-4 indicate locations where each corner is in contact with the inner wall of the case 1.

A rotating shaft 6 with the rotor 5 extrapolated is supported at the center of the case 1 by the double bearings. The case 1 and the two bearings are fixed by welding from the outside of the case 1. Case 1 in which stator 4 having a polygonal shape is shrink-fitted.
Is distorted in shape along the surface of the four corners of the stator 4 in contact with the inner wall of the case 1;
Since the positions of the corners and the positions of the four corners of the two bearings are aligned in the axial direction of the rotary shaft 6, the gap between the stator 4 and the rotor 5 can be kept uniform, and Coaxiality can be secured.

In this embodiment, the number of the corners of the stator 4 is four, but as described above, for example, three, four, five,
6, 7, 8, 9, 10, 11, 12 or the like, and the number of corners of the corresponding polygonal main bearing is the same as or less than the number of corners of the stator 4. The number may be, for example, as shown in Table 1 below, corresponding to the number of corners of the stator 4.

[0011]

[Table 1]

Each corner may be provided with a notch to form a bridge or the like, but the notch is not calculated as the number of corners.

The hermetic compressor of the present invention is the same as the hermetic compressor shown in FIG. 3 except that the motor structure uses the motor structure of the present invention.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0015]

According to the motor structure of the present invention, a uniform gap between the stator 4 and the rotor 5 is maintained by using the case 1 in which a polygonal stator 4 having a plurality of corners at equal intervals on the outer periphery is shrink-fitted or press-fitted. Thus, the two bearings can be welded and fixed from outside the case 1 while securing the coaxiality of the two bearings. Since the hermetic compressor of the present invention is provided with the motor structure of the present invention, the gap between the stator 4 and the rotor 5 is uniform, the coaxiality of both bearings is secured, and various characteristics such as refrigeration characteristics are excellent.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view illustrating an overall configuration of an embodiment of a motor structure of the present invention.

FIG. 2 is an explanatory plan view of the electric motor structure of the present invention shown in FIG. 1;

FIG. 3 is an explanatory diagram illustrating the overall configuration of a conventional hermetic compressor.

[Explanation of symbols]

1A Hermetic compressor 1 Case 2 Electric element 3 Compression element 4 Stator 5 Rotor 6 Rotating shaft 7 Main bearing 8 Sub bearing 4-1 4-2, 4-3, 4-4, 7-1, 7-2, 7
-3, 7-4, 8-1, 8-3 Corner 11 Motor structure

 ──────────────────────────────────────────────────の Continuing on the front page (72) Fumihiko Kurita 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Yoshinori Tobo 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Katsutake Tsuchiya 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] In a cylindrical case in which a polygonal stator having a plurality of corners on its outer periphery at substantially equal intervals is shrink-fitted or press-fitted, a plurality of stators having the same or less number of corners on the outer periphery at substantially equal intervals are provided. In a motor structure in which a polygonal bearing having corners is attached, and the bearing supports a rotating shaft with a rotor extrapolated to the case, the position of the corner of the stator and the position of the corner of the bearing are defined by the positions of the rotating shaft. An electric motor structure characterized by being arranged so as to be aligned in the axial direction. 2. A hermetic compressor having the motor structure according to claim 1.