JPS62298673A - Manufacture of motor compressor - Google Patents

Abstract

PURPOSE:To perform a job of joining between a stator core and a frame simply and accurately, by installing plural notches passing through an outer circumferential surface of the stator core in the laminating direction, inserting each bar into these notches, and inserting a projecting part of the bar into the frame. CONSTITUTION:At the time of manufacture, first plural electric steel sheets provided with a notch 20 each are laminated, and a bar 21 is inserted into each notch to the extent of a position where the flange 23 hits the steel sheet at the uppermost end. And, the notch 20 part and the bar 21 are joined together by means laser beam welding while pressurizing each steel sheet in the laminating direction, forming a stator core 17. Afterward, a coil 18 is rolled on this stator core 17. On the other hand, a turning shaft 5 is passed through the bearing member 7 welded to a frame 2, and a rotor 17 is externally fitted in this turning shaft 5, while the stator core 17 is set up on the circumference of the rotor 19. And, after a tubular mounting leg 12 is inserted into a projecting part 26 of the bar 21, this inserted part is welded by means of the laser beam welding, thus the frame 2 and the stator core 17 are joined together.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (A) Industrial Application Field The present invention relates to a method of manufacturing an electric compressor used in electric refrigerators, room conditioners, etc.

(B) Prior Art Conventionally, there is a method for manufacturing an electric compressor of this type, which is disclosed in Japanese Patent Publication No. 18942/1982 and is shown in FIG. 4. This involves joining the tubular body 31 to the outer periphery of the stator 3o so that a portion thereof protrudes, and concentrically drawn parts 34 and 35 are formed in the central and peripheral parts of the steel plate frame 33. A main bearing member 36 is inserted into and joined to the main bearing member 36, a rotating shaft 37 is inserted into this main bearing member 36, a rotor 38 is fixed to a part of this rotating shaft, and a gap gauge 39 and a stator 30 are attached to the outside of the rotor. The frame 33 and the stator 30 are joined by arranging the protruding portion 32 of the tubular body 31 to fit into the peripheral constricted portion 35 of the steel plate frame 33, and welding the fitting portion. The electric compressor manufactured by this method does not use a cast frame that requires removal, so it not only reduces resources and weight, but also
This provides effects such as sufficient parallelism and concentricity between the main bearing member 36 and the tubular body 31.

(8) Problems to be Solved by the Invention However, according to the above configuration, the tube body 31 is joined to the outer periphery of the stator 30 so as to completely wrap the outer circumferential surface thereof, so a large amount of material is required for the tube body itself. There was a problem in that not only could the weight not be reduced as much as expected, but also the welding work would be complicated. That is, when joining the tube body 31 to the stator 30, the stator 30 is created in advance by laminating silicon steel plates to a predetermined thickness and caulking the outer edges and welding a suitable number of points on the outer circumferential surface. This requires troublesome welding work such as fitting the tubular body 31 into the created stator and then welding the fitting portion between the stator 30 and the tubular body 31. Further, according to such a configuration, when the stator 30 is cylindrical, the stator and the tube body 31 are in close contact with each other over the entire circumference, but when the stator 30 is approximately prismatic (having a flat surface on the side surface), In some cases, the stator and the tube body 31 are likely to collide locally, causing the stator and the tube body 31 to become unparallel to each other, and when the rotor 38 is incorporated into the stator 30, air gap defects are likely to occur. Therefore, it was not suitable for this type of stator.

The present invention has been developed in view of these points, and while further promoting the existing effects of resource reduction and weight reduction, it also simplifies the welding work, and also enables a substantially prismatic stator with flat sides. It is an object of the present invention to provide a method for manufacturing an electric compressor that does not cause air gap defects or the like.

(d) Means for Solving the Problems The present invention provides an electric compressor in which a stator core made of laminated electrical steel plates and a frame on which a compressor section is attached are joined by welding. A plurality of notches are provided on the outer circumferential surface of the stator core that penetrates in the stacking direction of the core, and a bar whose part protrudes from the end surface of the core is inserted into each of the notches, and the stator core is processed in the stacking direction. While pressing, the bar and the stator core are joined by laser welding at the notch of the core so that a part of the bar protrudes, while a bar insertion hole is provided in the frame, and the bar protrudes into the insertion hole. After inserting the stator core, the stator core and frame are joined by laser welding the inserted portion.

(*) Function According to the method of manufacturing an electric compressor of the present invention, since the connecting member between the stator core and the frame is made of a plurality of rods, it is possible to realize further resource reduction and weight reduction compared to the conventional method. In addition, since the bars are welded to the stator core while applying pressure in the stacking direction, it is no longer necessary to perform fixing work such as caulking the outer edge of the stator core or welding at appropriate locations on the outer periphery, which is required in the past, and connects it to the stator core. Welding work for members (bars in the present invention) can be simplified. Furthermore, since the stator core and the bar are welded at the notch that is formed through the core in the stacking direction, the laser beam can be applied to the entire length of the bar, resulting in high joint strength. can get. In addition, by using laser welding for the above welding, it is possible to concentrate the heat input on the welded part and not heat the surrounding area too much, which not only shortens the welding time compared to other welding methods, but also allows for the welding of frames and bars. By reducing thermal deformation, assembly accuracy can be improved, and air gap dimensional accuracy can be improved accordingly.

(f) Example The present invention will be explained below based on the drawings.

Reference numeral 1 denotes a frame 2 made of steel plate, a compressor section 3 mounted on the upper part of the frame, an electric motor section 4 mounted on the lower part of the frame 2, and a rotating shaft 5 connecting these two machine sections 3.4. This is a hermetic electric compressor constructed by housing the compressor in a hermetically sealed case 6.

The steel plate frame 2 has a hole 8 for joining the bearing member 7, an angle 10 and a hole 11 for installing the cylinder 9, which will be described later, and a hole 13 for joining the tubular mounting leg 12, in the center thereof. There is. The compressor section 3 includes a cylinder 9 that can be inserted into the hole 11 of the frame 2 and is connected to an angle 10, and a cylinder head 14 that closes the open end surface of the cylinder.
It is composed of a piston 15 that reciprocates within the cylinder 9, and a connecting rod 16 that connects the piston to the eccentric portion 5a of the rotating shaft 5. The electric motor section 4 includes a stator core 17 formed into a substantially prismatic shape by laminating substantially prismatic silicon copper plates.
, the coil 18 wound around this core, and the rotating shaft 5
The rotor 19 is fitted onto the outside of the stator core 17 and rotates within the stator core 17.

Reference numeral 20 designates keyhole-shaped notches in cross section that are formed at three locations on the outer circumferential surface of the stator core 17 so as to penetrate in the stacking direction of the core. A bar 21 is inserted into the notch 20 of the stator core 17 so that a portion thereof protrudes from the upper end surface of the lower, and is joined to the stator core 17 by laser welding from the outer periphery of the core. A positioning flange 23 that also serves as a stopper for the coil spring 22 and an upper retainer 24 are integrally formed at the lower end of this rod.

Reference numeral 12 denotes three tubular mounting legs joined to the holes 13 of the frame 2. A protruding portion 26 of the bar 21 is inserted into the hole 25 of the mounting leg, and the mounting leg and the bar 21 are joined together by laser welding at the insertion portion.

A method for manufacturing the hermetic electric compressor constructed in this manner will be described below with reference to FIGS. 2 and 3.

First, electrical steel sheets each having a notch 20 are laminated.
Next, the bar 21 is inserted into the notch 20 of this steel plate until the flange 23 contacts the uppermost steel plate. (here,
By making at least a part of the cross-sectional shape of the notch 20 and the cross-sectional shape of the bar 21 approximately the same -1, for example, circular, the bar 21
This can prevent the silicon steel plate from shifting. )and,
While pressing the steel plate in the stacking direction, the notch 20 portion and the bar 2
1 by laser welding the stator core 17.
form. After that, the coil 18 is wound around the stator core 17. On the other hand, three tubular mounting legs 12, a bearing member 7, and a cylinder 9 are joined to the frame 2. Then, the rotating shaft 5 is inserted into the bearing member 7, the rotor 19 is fitted onto the rotating shaft, and an air gap gauge 27 and a stator core 17 are arranged around the outer periphery of the rotor. After inserting the tubular mounting leg 12, the frame 2 and the stator core 17 are joined by laser welding the protrusion 26 of the bar 21 and the tubular mounting leg 12 at the inserted portion.

The hermetic electric compressor manufactured in this way has the stator core 17 and frame 2 welded together using three rods 21, which reduces resources and weight while maintaining the parallelism between the core and frame 2. This effect can be further enhanced. In addition, since the bar material 21 is completely welded to the stator core 17 while applying pressure to the stator core 17 in the stacking direction, there is no need to swage the stator core at its outer edge or weld the outer periphery at appropriate places, unlike in the past. and connecting member (
In this embodiment, the welding work of the bar material 21) can be simplified. Furthermore, since the stator core 17 and the bar 21 are welded at the notch 20 formed through the core in the stacking direction, the laser beam can be applied to the entire length of the bar 21. , high bonding strength can be obtained. Furthermore, by using laser welding for the above-mentioned welding, the heat input is concentrated only on the welded parts between the stator core 17 and the bar 21, and between the protruding part 26 of the bar 21 and the tubular mounting leg 12 of the frame 2. It is possible to join without heating too much, which not only shortens the welding time compared to other welding methods, but also reduces thermal deformation of the frame 2 and bar 21, improving assembly accuracy and reducing the air gap associated with this. It is possible to improve dimensional accuracy, etc.

Furthermore, according to the manufacturing method of this embodiment, even if the laminated thickness of the stator core 17 is different, the frame 2 and the stator core 17 can be easily connected by simply changing the insertion length of the protrusion 26 of the bar 21 into the tubular mounting leg 12. It can be joined easily to accommodate compressors with different outputs.

(g) Effects of the invention As described above, according to the method of manufacturing an electric compressor of the present invention,
Since the connection members between the stake core and the frame are made of multiple rods, even when the stator core is approximately prismatic, the parallelism between the stator core and the frame is not impaired, and the dimensional accuracy of the air gap is increased. At the same time, it is possible to achieve further reduction in resources and weight compared to the conventional method.

Furthermore, since the bar material is welded to the stator core while applying pressure to the stator core in the stacking direction, it is no longer necessary to fix the stator core in advance by caulking or welding at appropriate positions on the outer periphery, as in the past, and the welding work can be simplified. Furthermore, since the stator core and the bar are welded at the notch in the core, the laser beam can be applied to the entire length of the bar.
High bonding strength can be obtained. In addition, by using laser welding for the above welding, it is possible to concentrate the heat input on the welded part and not heat the surrounding area too much, which not only shortens the welding time compared to other welding methods, but also allows for the welding of frames and bars. By reducing thermal deformation, it is possible to improve assembly accuracy and, accordingly, improve air gap dimensional accuracy.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, in which FIG. 1 is a longitudinal sectional view of a hermetic electric compressor, FIG. 2 is an exploded sectional view of the compressor main body shown in FIG. The figure is a perspective view of the stator core, and FIG. 4 is a sectional view illustrating the assembled state of a conventional compressor main body. 2... Frame, 3... Compressor section, 4... Electric motor section, 12... Tubular mounting leg, 17... Stator core, 20... Notch, 21... Bar material,
26...Protrusion. Applicant: Sanyo Electric Co., Ltd. and one other agent Patent attorney Takuji Nishino and one other person Figure 1 Figure 2

Claims (1)

[Claims] (1) In an electric compressor in which a stator core formed by laminating electrical steel plates and a frame to which a compressor section is attached are joined by welding, on the outer peripheral surface of the stator core,
A plurality of notches are provided that penetrate the core in the stacking direction, and a bar with a portion protruding from the end surface of the core is inserted into each of the notches, and the bar is pressed while pressing the stator core in the stacking direction. and the stator core are joined by laser welding at the notch of the core so that a part of the bar protrudes, while a bar insertion hole is provided in the frame, and the protruding part of the bar is inserted into this insertion hole. A method for manufacturing an electric compressor, characterized in that the stator core and frame are joined by laser welding the inserted portion.