JPH033983A - Sealed compressor and manufacture thereof - Google Patents

Abstract

PURPOSE:To lower the cost and facilitate the fitting of a heat shielding plate by fitting the heat shielding plate on the cylindrical inner periphery of an upper case, providing a taper section bent inward on the periphery of the cylinder section lower end of the upper case, and inserting the taper section into a lower case. CONSTITUTION:A bottomed cylindrical upper case 3 is formed by drawing or the like, then a heat shielding plate 6 is fitted at the preset position on the inner periphery of the upper case 3 by spot welding or the like. A taper section 3a bent inward and having the lower end inner diameter (d) smaller than the fitting section inner diameter D of the heat shielding plate 6 is provided on the periphery at the cylinder section lower end of the upper case 3 located below the fitting position of the heat shielding plate 6. No cut machining is required for passing the heat shielding plate 6 on the lower end periphery of the upper case 3, and machining man-hours are reduced that much. The taper section 3a is inserted into the taper section of the upper end opening section of a lower case.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention is directed to a hermetic compressor, in particular, a method of enclosing the motor coil end, etc., in order to prevent the motor coil end, etc. from being damaged by welding heat. The present invention relates to a hermetic compressor that facilitates the installation of a heat shield plate disposed on the inner peripheral surface of an upper case, and a method for manufacturing the same.

(Prior art) In a sealed compressor, when the upper case and the lower case are welded in a sealed state, the welding heat causes internal parts, such as the motor coil end, to become close to the welded part. It may be damaged. In order to prevent this damage, a heat shield plate is generally attached to the inner peripheral surface of the upper case at a position corresponding to the welded portion.

To explain this with reference to FIGS. 3 and 4, a tapered portion 2a that bends and expands outward is provided at the upper end opening of the lower case 2 in which the electric element 1 is disposed. The lower end opening of the upper case 3 that closes the upper opening end of the upper case 2 is also formed with a pointed taper 3a that bends inward in correspondence with the taper part 2a.

Then, the lower opening of the upper case 3 is fitted into the upper opening of the lower case 2 using both tapered parts 2a and 3a as guides, and the welded part 4 between the lower end surface of the lower case 2 and the outer peripheral surface of the upper case 3 is inserted. Weld along the length to connect the two in a hermetically sealed manner.

At this time, the motor end coil 5 that protrudes above the electric element 1 is located inside the upper case 3 and may be affected by heat due to welding and may be damaged.

Therefore, a heat shield plate 6 shown in FIG. 4, which is a thin plate having a substantially cylindrical shape and has a plurality of outward protrusions 6a, 6a, . By fixing and arranging the motor end coil 5 on the inner circumferential surface 3b of the motor end coil 5 by spot welding or the like, damage due to heat effects during welding of the motor end coil 5 is prevented.

Here, the tapered part 3a of the upper case 3 is formed by, for example, a countersink process before the heat shield plate 6 is attached therein, or because of this process, the inner diameter of the lower end surface is generally It is smaller than the outer diameter of the hot plate 6. Therefore, by performing end face cutting, the fifth
As shown in the figure, a notch 3C extending vertically in the vertical direction is provided on the inner peripheral surface corresponding to the tapered portion 3a of the upper case 3,
Generally, the inner diameter d' of this lower end portion is made larger than the outer diameter of the heat shield plate 6 so that passage of the heat shield plate 6 is not obstructed.

Furthermore, as a device that does not require end face cutting, a device in which a band-shaped heat shield plate is wound around a predetermined position on the inner circumferential surface of the upper case is also generally known.

Furthermore, as Japanese Utility Model Publication No. 61-41394, a flange portion having an outer diameter approximately the same as the outer diameter of the end surface of the upper case, two or more protrusions having an outer diameter slightly larger than the inner diameter of the upper case, and a portion slightly smaller than the inner diameter of the upper case. It has been proposed that the heat shield plate is formed integrally with a cylindrical portion having an outer diameter so that the heat shield plate can be fitted into the upper case without welding.

(Problem to be Solved by the Invention) However, in the case shown in FIG. 5, since it is necessary to cut the inner peripheral surface of the lower part of the upper case in order to arrange the heat shield plate inside the upper case, This results in an increase in the number of processing steps, which becomes a major cause of cost increase. This is considered to be the same for the method described in the above-mentioned Japanese Utility Model Publication No. 61-41394.

Furthermore, it is quite difficult to improve the dimensional accuracy of the heat shield wrapped around the band-shaped heat shield, and the dimensional accuracy generally deteriorates.In particular, small compressors have the problem that it is difficult to maintain sufficient insulation distance at the end of the motor coil. Ta.

In view of the above, the present invention provides a heat shield plate on the inner peripheral surface of the upper case.
The purpose is to provide something that can be installed easily and accurately.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the sealed compressor according to the present invention has a lower end opening of the upper case fitted into an upper opening end of the lower case, and a lower end face and an upper part of the lower case. In a hermetic compressor in which the outer circumferential surface of the upper case is welded to the outer circumferential surface of the upper case, and a heat shield plate is provided on the inner circumferential surface of the upper case and located inside the welded part, the cylindrical inner circumferential surface of the upper case is In addition to installing a heat shield plate, this heat shield plate is attached to the periphery of the lower end of the cylinder of the upper case located below the position, by bending it inward so that the inner diameter of the lower end surface is smaller than the inner diameter of the part where the heat shield plate is attached. A tapered portion is provided, and this tapered portion is fitted into the lower case.

In addition, in the method for manufacturing the sealed compressor, a heat shield plate is installed in advance at a predetermined position on the cylindrical inner circumferential surface of the lower case, and then a tapered portion bent inward is attached to the periphery of the upper end of the lower case. The lower end of the lower case is fitted into the upper end opening of the lower case through this tapered part, and the upper end surface of the lower case and the outer peripheral surface of the upper case are welded. .

(Function) According to the present invention configured as described above, the lower end of the upper case is bent inward after the heat shield plate is installed inside the upper case. This eliminates the need to cut the inner peripheral surface of the lower end to allow the heat shield to pass through, thereby reducing the number of processing steps, and since a band-shaped heat shield is not used, the accuracy of the heat shield can be improved. It can be easily attached to the inner surface of the upper case.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in FIGS. 3 and 4 above, the upper end opening of the lower case 2 in which the electric element 1 is disposed has a tapered portion 2a that bends outward and expands, while a fourth portion is provided on the inner circumferential surface. The lower end opening of the upper case 3 which closes the upper opening end of the lower case 2, which is welded by spot welding or the like, is a heat shield plate 6 having a substantially cylindrical thin plate and having a plurality of protrusions 6a, . . . shown in the figure. Also, a pointed taper 3a bent inward corresponding to the tapered part 2a is formed respectively, and the lower opening of the upper case 3 is connected to the upper opening of the lower case 2, and both tapered parts 2a3a are used as guides. The lower case 2 is inserted and welded along the weld portion 4 between the upper end surface of the upper case 3 and the outer circumferential surface of the upper case 3 to connect the two in a hermetically sealed state. This is done in the following manner.

That is, as shown in FIG. 2(a), after forming the bottomed cylindrical upper case 3 by drawing or the like, as shown in FIG. 2(b), the inner circumferential surface of the upper case 3 is A heat shield plate 6 is attached to the location by spot welding or the like. After that, the same figure (
As shown in c), for example, by performing countersink processing, the heat shield plate 6 is attached to the periphery of the lower end of the cylinder of the upper case 3 located below the position, by bending it inward and adjusting the inner diameter d of the lower end surface. To attach the heat shield plate, a tapered part 3a having a diameter smaller than the inner diameter of the part is provided. An enlarged view of the main parts at this time is shown in Fig. 1.

In this way, by adopting a configuration in which the lower end of the upper case 3 is bent inward after the heat shield plate 6 is installed inside the upper case 3, the heat shield plate is attached to the inner peripheral surface of the lower end of the upper case 3. By eliminating the need for cutting to allow the balls to pass through, the number of processed balls can be reduced accordingly.

After fitting this tapered part 3a into the tapered part a of the upper end opening of the lower case 2, the lower case 2
Welding is performed along the welding part 4 between the upper end surface and the outer peripheral surface of the upper case 3, and the heat shield plate 6 reliably prevents the influence of heat on the motor coil end 5 during this welding to prevent this damage. can be reliably prevented.

〔Effect of the invention〕

Since the present invention has the above-described configuration, cutting of the inner circumferential surface of the upper case is not necessary, and not only can the number of machining steps and associated costs be reduced, but also the band-shaped heat shield plate can be cut. Since the heat shield plate is not used, the heat shield plate can be attached to the inner circumferential surface of the upper case with good precision. Moreover,
It is relatively easy to install the heat shield inside the upper case.Furthermore, even if the heat shield comes off from the upper case, it will prevent the heat shield from passing through the lower end of the upper case. This has the effect of preventing the upper case from falling downward and preventing a decrease in the durability strength of the lower part of the upper case.

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 show one embodiment of the present invention, Fig. 1 is a vertical sectional view of the main part (enlarged view of part A in Fig. 3), and Fig. 2 is a heat shield plate inside the upper case. The assembly process diagram shows the state. Figures 3 and 4 show a general compressor. Figure 3 is a longitudinal sectional view of the main parts, Figure 4 is a perspective view of the heat shield, and Figure 5 is a diagram showing the state of the assembly. FIG. 3 is a vertical cross-sectional view of the main part of the conventional example (an enlarged view of section A in FIG. 3). DESCRIPTION OF SYMBOLS 1... Electric element, 2... Lower case, 2a... Tapered part, 3... Upper case, 3a... Tapered part, 4... Welding line, 5... Motor end Coil, 6... Heat shield plate.

Claims (1)

[Claims] 1. The lower end opening of the upper case is fitted into the upper opening end of the lower case, and the upper end surface of the lower case and the outer peripheral surface of the upper case are welded, and the inside of the welded part of the upper case is In a hermetic compressor in which a heat shield plate is installed on the inner peripheral surface of the upper case, the heat shield plate is installed on the cylindrical inner peripheral surface of the upper case, and the heat shield plate is located below the installation position of the heat shield plate. A tapered part is provided on the periphery of the lower end of the cylinder of the upper case, which is bent inward so that the inner diameter of the lower end surface is smaller than the inner diameter of the heat shield mounting part, and this tapered part is fitted into the lower case. A sealed compressor. 2. After installing a heat shield plate in advance at a predetermined position on the cylindrical inner circumferential surface of the lower case, a tapered part bent inward is formed on the lower edge of the lower case, and the lower part is inserted through this tapered part. A method for manufacturing a sealed compressor, comprising fitting a lower end of the case into an upper opening of the lower case, and welding the upper end surface of the lower case to the outer peripheral surface of the upper case.