JP5456249B2 - Manufacturing method of hermetic electric compressor - Google Patents

Description

  The present invention relates to a method for manufacturing a hermetic electric compressor used in a refrigerant circuit of various types of cooling and heating equipment, for example.

Conventionally, this type of hermetic electric compressor includes a hermetic container containing internal components such as a compression mechanism and a motor, and the compression mechanism is supported at a predetermined position in a cylindrical container body forming a part of the hermetic container. What fixed the member is known. In this case, the support member of the compression mechanism is press-fitted and fixed in the container body. In this case, however, there is a problem that the support member is deformed by press-fitting and the performance of the compression mechanism is lowered. In view of this, a support member having an outer diameter slightly smaller than the inner diameter of the container body is fixed to the container body by welding (see, for example, Patent Document 1).
Japanese Patent No. 3318864

  By the way, since the internal parts such as the support member support the rotating part of the compression mechanism connected to the rotating shaft of the motor, it is necessary to arrange them coaxially with respect to the container body. In the case where the support member is fixed by welding, there is a problem in that the misalignment occurs due to the gap between the container main body and the support member, and the support member cannot be accurately fixed coaxially to the container main body.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to provide an internal component with respect to the container body even when an internal component having an outer diameter smaller than the inner diameter of the container body is welded to the container body. It is another object of the present invention to provide a method for manufacturing a hermetic electric compressor that can be accurately and coaxially fixed.

In order to achieve the above object, the present invention provides a sealed electric compressor manufacturing method in which predetermined internal parts are welded and fixed to an inner peripheral surface of a sealed container, and a cylinder forming a part of the sealed container A predetermined internal part is disposed at a predetermined position in the container body, and the outer peripheral surface of the container body is simultaneously clamped by pressing the outer peripheral surface of the container body from the equally spaced positions in three or more circumferential directions toward the radially inner side. The internal parts are clamped by the pressed inner peripheral surface of the container body, and the container body and the internal parts are welded at intermediate positions between the clamps while holding the clamp .

As a result, the internal part is clamped by the inner peripheral surface of the container main body at three or more points in the circumferential direction by the pressing of the clamp, so that the internal part and the container main body are welded in a state in which their axial centers coincide. In this case, since the intermediate positions between the clamps that sandwich the container body are welded, the welding locations are equally spaced in the circumferential direction of the container body.

According to the present invention, even when an internal part having an outer diameter smaller than the inner diameter of the container main body is welded to the container main body, the inner part and the container main body can be welded in a state in which their axial centers coincide with each other. The internal parts can be fixed coaxially with respect to the container body with high accuracy. In addition, since the welding locations are equally spaced in the circumferential direction of the container body, the load applied to each welding location when using the compressor can be uniformly dispersed.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a side sectional view of a hermetic electric compressor, FIG. 2 is a side sectional view showing a welding process of a support member, and FIGS. It is a plane sectional view showing a welding process of a support member.

  The electric compressor shown in the figure includes a metal hermetic container 10 whose upper and lower ends are closed, a scroll-type compression mechanism 20 that compresses a refrigerant, and a motor 30 that drives the compression mechanism 20. The motor 30 is accommodated in the sealed container 10.

  The sealed container 10 includes a cylindrical container body 11 having an upper end and a lower end opened, an upper lid 12 that closes the upper end opening of the container body 11, and a lower lid 13 that closes the lower end opening of the container body 11. A pipe 14 for sucking the refrigerant is attached to the side surface of the container body 11 so as to penetrate therethrough. The upper lid 12 and the lower lid 13 are made of a metal member formed in a substantially hemispherical shape, and each peripheral edge portion is joined to the opening edge of the container body 11. A refrigerant discharge pipe 15 is attached to the upper lid 12 so as to penetrate therethrough.

  The compression mechanism 20 includes a known mechanism including a fixed scroll member 21 and a movable scroll member 22 that face each other with a spiral body. The movable scroll member 22 is attached to a support member 23 fixed to the inner peripheral surface of the container body 11. It is supported rotatably. The support member 23 is made of a metal disk-like member, and its outer diameter D1 is slightly smaller than the inner diameter D2 of the container body 11.

  The motor 30 is disposed below the compression mechanism 20, and the upper end of the rotation shaft 31 is connected to the movable scroll member 22. The lower end of the rotation shaft 31 is rotatably supported by a bearing 32, and the bearing 32 is fixed to the inner peripheral surface of the container body 11 via a support member 33. Further, the motor 30 is fixed to the inner peripheral surface of the container body 11 via the stator 34.

  Next, in the manufacturing process of the electric compressor, a process of fixing the support member 23 of the compression mechanism 20 that is one of internal parts to the container body 11 will be described. First, as shown in FIG. 2, the support member 23 is inserted into the container main body 11 and arranged at a predetermined position in the container main body 11. Next, as shown in FIG. 3, the outer peripheral surface of the container main body 11 is pressed radially inward from three equally spaced positions by the clamp 40, and the container main body 11 is pressed radially inward by pressing the clamp 40. By deforming, the support member 23 is held between the inner peripheral surfaces of the container body 11. At this time, since the support member 23 is sandwiched between the container main body 11 at three points in the circumferential direction, the support member 23 and the container main body 11 are held in a state where the axial centers thereof coincide with each other. Thereafter, as shown in FIG. 4, tack welding is performed at three positions in the circumferential direction of the container main body 11 from the outer peripheral surface to intermediate positions between the clamps 40, and the container main body 11 and the support member 23 are welded. In this case, since the container main body 11 and the support member 23 are welded in a state in which the axial centers coincide with each other by sandwiching the clamp 40, the welded portions W at three circumferential directions are provided even if the pressing of the clamp 40 is released. Are fixed to each other in a coaxial state.

  Thus, according to this embodiment, the outer peripheral surface of the container main body 11 is pressed radially inward from the three locations in the circumferential direction by the clamp 40, and the support member is supported by the inner peripheral surface of the container main body 11 by the pressing of the clamp 40. Since the container body 11 and the support member 23 are welded in a state where the 23 is sandwiched, even when the support member 23 having an outer diameter smaller than the inner diameter of the container body 11 is welded to the container body 11, The container main body 11 can be welded in a state where the axes are aligned with each other by sandwiching the clamp 40, and the support member 23 can be fixed to the container main body 11 coaxially with high accuracy.

  Further, since the support member 23 and the container main body 11 are welded by tack welding from the outer peripheral surface of the container main body 11, the welding work of the support member 23 and the container main body 11 can be easily performed, and productivity is improved. Can be improved.

  In this case, since the intermediate positions between the clamps 40 that sandwich the container main body 11 are welded, the welded portions are equally spaced in the circumferential direction of the container main body 11, and are added to the respective welded portions when the compressor is used. The load can be uniformly distributed.

  In addition, although the thing using the tack welding was shown in the said embodiment, you may make it weld the support member 23 and the container main body 11 with another welding method.

  In the above-described embodiment, the manufacturing method in the case where the support member 23 of the compression mechanism 20 is welded to the container body 11 has been described. It can also be applied when welding parts.

Side surface sectional drawing of the hermetic type electric compressor which shows one Embodiment of this invention Side sectional view showing the welding process of the support member Plan sectional view showing the welding process of the support member Plan sectional view showing the welding process of the support member

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Airtight container, 11 ... Container main body, 20 ... Compression mechanism, 30 ... Motor, 40 ... Clamp.

Claims (2)

In the manufacturing method of a sealed electric compressor in which predetermined internal parts are welded and fixed to the inner peripheral surface of the sealed container,
While disposing a predetermined internal part at a predetermined position in a cylindrical container body forming a part of the closed container,
By simultaneously pressing the outer peripheral surface of the container body from the equally spaced positions in three or more circumferential directions toward the radially inner side by clamping, the internal parts are sandwiched by the inner peripheral surface of the container body pressed by the clamp, and clamping is performed. A method for manufacturing a hermetic electric compressor, wherein the container body and internal parts are welded at intermediate positions between the clamps in a held state. The container body and the internal parts and the manufacturing method according to claim 1 Symbol placement of the hermetic electric compressor, characterized in that welded by tack welding from the outer peripheral surface of the container body.

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