JPH076681Y2 - Hermetic compressor electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to the structure of a rotor of an electric motor of a hermetic compressor.

(B) Conventional Technology In general, there is a conventional technology as described in Japanese Utility Model Laid-Open No. 54-86604. The one described in this publication inserts the rotary shaft into the shaft hole at the center of the rotor,
A spiral ventilation hole having an axis of rotation is provided from one end surface to the other end surface of the rotor. In addition, when a plurality of magnetic steel sheets were laminated, the ventilation holes were formed by successively shifting the polymerization angles of the magnetic steel sheets and connecting the ventilation holes.

(C) Problems to be solved by the invention In a hermetic compressor, it is necessary to secure sufficient oil used in the compressor section. In recent years, an inverter power supply has been used for a compressor, and as the compressor is rotated at a high speed using this inverter power supply, oil discharge from the compressor is increasing. In the conventional structure, oil is returned to the compressor section through the gap in the electric motor section to reduce the oil discharge rate, but the oil discharge rate has increased due to the speedup of the compressor.

Therefore, as described in the above-mentioned prior art, a communication hole for communicating one end face of rotation with the other end face was provided to increase the oil return path. In the case of caulking, the position of the caulking round hole must be located approximately in the middle of the rotor slot and inner diameter in order to maintain the caulking strength. Due to the relationship with the strength, the position of the communication hole was significantly limited.

Therefore, the rotor cannot be crimped by the conventional technique, and a step of crimping the core is required, resulting in poor workability.

The present invention satisfies the restriction of the position of the communication hole as described above,
The structure of the rotor provides the maximum oil return effect.

(D) Means for Solving the Problems The present invention is a hermetically sealed compressor in which a compressor unit and an electric motor that rotates a rotary shaft fitted to a rotor to drive the compressor unit are housed in the same hermetic container. A first electromagnetic steel plate having an inner diameter capable of mounting the rotor on a rotating shaft, the motor comprising a plurality of communication holes that make one end surface and the other end surface of the rotor communicate with each other. After caulking and laminating a plurality of sheets, a second electromagnetic steel sheet having an inner diameter larger than the inner diameter of the first electromagnetic steel sheet is connected to the first electromagnetic steel sheet and caulked and laminated to form a communication hole. In addition, the center of the cross section orthogonal to the rotation axis of the communication hole is arranged on the inner diameter of the second electromagnetic steel sheet while having an oval shape in the direction toward the direction.

(E) Action With this configuration, the center of the communication hole is located at the second position.
It is arranged on the inner diameter of the electromagnetic steel plate, and the communication hole can be provided at a position away from the rotation shaft while ensuring the strength when the rotor is crimped.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a partial cross-sectional view of the hermetic compressor, in which 1 and 2 are containers, and after the compressor section 3 and the electric motor section 4 are housed therein,
Containers 1 and 2 are welded by high frequency heating to form a closed container.
Reference numeral 5 denotes a rotary shaft that is press-fitted and fixed to the rotor 6, and the rotation of the rotary shaft 5 drives the compressor unit 3 to compress the refrigerant. 7 is a stator of the electric motor unit 4,
A rotating magnetic field is applied to the rotor 6 to rotate the rotor. A discharge port 8 is a pipe for discharging the compressed refrigerant. In the compressor configured as described above, the refrigerant compressed in the compressor unit 3 is discharged into the containers 1 and 2 and then discharged from the discharge pipe 8. At this time, the oil accumulated on the side of the discharge pipe 8 in the compressor is returned to the compressor unit 3 through the gap of the electric motor unit 4.
Incidentally, 32 is a disk.

FIG. 1 is a top view of an electromagnetic steel plate 11 used for the portion A of the rotor 6 shown in FIG. Reference numeral 9 designates an inner diameter of the rotary shaft 5 that allows shrinkage fitting, and 10 designates rotor slots, which are arranged on the outer peripheral side at equal intervals. The slot 10 is formed by laminating electromagnetic steel plates 11 and die-casting the rotor bars. 12 to 15 caulking part, 16 to 19
Is an oval-shaped hole that is connected to form a communication hole when a plurality of electromagnetic steel plates 11 are stacked. Each hole 16-19
Is a long ellipse facing the circumference of the inner diameter 9, and the centers of the ellipses (holes) 16 to 19 are arranged on the circumference of the circle 20 shown by the dotted line. This circle 20 is concentric with the inner diameter 9, and its diameter matches the inner diameter 22 of the electromagnetic steel plate 21 shown in FIG. FIG. 2 is a top view of the electromagnetic steel plate 21 used for the portion B of the rotor 6 shown in FIG. Reference numerals 23 to 26 are crimped portions, which are crimped to the crimped portions 12 to 15 of the electromagnetic steel sheet 11 when the electromagnetic steel sheet 21 is laminated on the electromagnetic steel sheet 11 shown in FIG. In this way, multiple electromagnetic steel plates 21
Slot 27 into slot 10 by
Will lead to. Also, the notches 28 to 31 in the shape of a half arc of an ellipse formed on the circumference of the inner diameter 22 overlap with the holes 16 to 19 of the electromagnetic steel plate 11 similarly to the slot 27, and part of the communication hole is formed. To form. When the electromagnetic steel plates 11 and 21 are caulked and stacked, the overlapping angle is sequentially shifted so that the slot and the communication hole are formed obliquely. This gives skew to the rotor bar when the rotor is die cast.

FIG. 4 is a top view of the rotor 6 shown in FIG. 3 as viewed from the discharge port 8 side (with the disk 32 removed). 33 is an end ring die-cast on the end face, 34 and 35 are discs 3
It is a protrusion for mounting 2.

FIG. 5 is a bottom view of the rotor 6 shown in FIG. 3 as seen from the compressor section 3 side. 36 is an end ring and 37 is a balance weight. 38 to 41 are communication holes, which are the communication holes 38 in FIG.
It is connected to ~ 41. By caulking and stacking the electromagnetic steel plates 9 and 21, a part of the communication hole has a groove shape opened toward the rotation axis.

When the rotor configured as described above is used, oil returns from the discharge port 8 side to the electric motor side through the communication hole.

(G) Effect of the Invention The present invention constitutes a hermetic compressor by accommodating a compressor unit and an electric motor for rotating the rotary shaft fitted to the rotor to drive the compressor unit in the same hermetic container. In addition, in an electric motor comprising a plurality of communication holes for communicating one end surface of the rotor with the other end surface, a plurality of first electromagnetic steel plates having an inner diameter capable of mounting the rotor on the rotation shaft are provided. After being firmly laminated, the second electromagnetic steel sheet having an inner diameter larger than the inner diameter of the first electromagnetic steel sheet was formed by continuously caulking and laminating the first electromagnetic steel sheet, and the communication hole was located at the inner diameter. Direction is oblong and the center of the cross section of this communication hole, which is orthogonal to the axis of rotation, is located on the inner diameter of the second electromagnetic steel plate, so there is no need to change the caulking position and the strength during caulking is secured. can do. Further, since the communication hole is arranged on the inner diameter of the second electromagnetic steel plate and is away from the rotation shaft, the oil returning effect can be sufficiently obtained. Further, since the communication hole is separated from the rotation axis and the concentration of the magnetic flux passing through the rotor is not hindered, it is possible to suppress the decrease in power efficiency due to the addition of the communication hole.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of an electromagnetic steel plate of part A of the rotor shown in FIG. 3, FIG. 2 is a top view of an electromagnetic steel plate of part B of the rotor shown in FIG. 3, 3 is a partial sectional view of a compressor showing an embodiment of the present invention, FIG. 4 is a top view of the rotor shown in FIG. 3 as seen from the discharge pipe side, and FIG. 5 is shown in FIG. It is a bottom view which looked at the rotor from the compressor part side. 3 ... Compressor section, 4 ... Electric motor section, 5 ... Rotating shaft, 6 ...
… Rotor, 9,22 …… Inner diameter, 11,21 …… Magnetic steel sheet, 12 to 15,
23 to 26 …… Caulking section, 16 to 19 …… Hole, 38 to 41 …… Communication hole.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A hermetic compressor is constructed by housing a compressor unit and an electric motor that drives a compressor unit by rotating a rotary shaft fitted to a rotor in the same hermetic container to form a hermetic compressor. In an electric motor comprising a plurality of communication holes for communicating one end surface of the child with the other end surface, after caulking a plurality of first electromagnetic steel plates having an inner diameter to which a rotary shaft can be attached, the rotor is laminated. A second electromagnetic steel plate having an inner diameter larger than the inner diameter of the first electromagnetic steel plate is connected to the first electromagnetic steel plate by caulking and laminated, and the communication hole is an ellipse in the direction toward the inner diameter. An electric motor for a hermetic compressor, which has a shape and has a center of a cross section orthogonal to the rotation axis of the communication hole arranged on the inner diameter of the second electromagnetic steel plate.