JPS6245779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hermetic electric compressor.

[Prior art]

A conventional hermetic electric compressor will be explained with reference to FIGS. 1 and 2. 1 is a closed container, 2 is a compressor part, 3
4 shows a motor section consisting of a stator 6 and a rotor 7, 4 a support frame, and 5 a hanging spring. The compressor section 2 and the electric motor section are mounted on a support frame 4 and are elastically suspended within the closed container 1 by a suspension spring 5. Reference numeral 8 indicates a screw hole formed on the lower surface of the support frame 4, reference numeral 9 indicates a bolt through hole of the stator 6, and reference numeral 10 indicates a bolt. The stator 6 is fixed to the support frame 4 with a predetermined gap from the rotor 7 with bolts 10.

In the above structure, the torque used when tightening the bolt 10 is a torque 7 that is a combination of the friction torque of the bolt thread, the torque for pressing the stator 6 against the support frame 4, and the friction torque of the bolt seating surface. 4. Tighten and fix. However, this kind of stator 6
is formed by stacking dozens of silicon steel plates of about 0.5 mm, so there is a slight gap between the stacked silicon steel plates due to the waviness of the silicon steel plates themselves, plastic deformation burrs caused by core punching, etc. Therefore, even if the stator 6 is tightened to the support frame 4 with the bolts 10, a portion of the tightening force of the bolts 10 is used to eliminate this gap, so that sufficient tightening force cannot be obtained. There is a drawback that there is no Therefore, there is a problem in that the stator 6 is displaced due to impact during transportation, and the gap between the stator rotor 7 and the stator 6 becomes unbalanced, resulting in poor performance as an electric motor. Conventionally, as a countermeasure against this problem, the bolt 10 is made of a special material and the tightening torque is made very high, or the diameter of the bolt 10 is increased to make the tightening torque very high. However, this increases the material cost and requires very high tightening torque, resulting in poor workability.

[Purpose of the invention]

The present invention has been made to improve the above-mentioned drawbacks.

[Summary of the invention]

In the present invention, the seating surface of a tightening bolt through hole provided in a stator made of laminated silicon steel plates constituting an electric motor section is pressurized in advance and then bolted to a support frame.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in FIG.

FIG. 3 is a component configuration diagram corresponding to FIG. 2 to which the present invention is applied, and 11 is a part corresponding to the head of the bolt 10, and the seat surface around the bolt through hole 13 of the stator 12 is pressed before assembly. This is the seat surface showing the area under pressure. In this way, by applying pressure in advance, the slight gaps caused by the waviness of the silicon steel plates themselves that occur between the stacked layers of the silicon steel plates, plastic deformation during core punching, burrs, etc. are corrected, so the silicon steel plates are in close contact with each other. .

On the other hand, silicon steel sheets are soft iron with a low carbon content, so even if you tighten the stator to the support frame with bolts to a fairly high torque, if there is a gap between the laminated layers, the bolts will tighten, but since the silicon steel sheets themselves have no rigidity, it will take a long time. If it rattles, the tightening force will decrease.

Therefore, as in the present invention, by pressurizing the seating surfaces of the bolt holes 13 of the stator 12 in advance, the laminated layers of the stator 12 are brought into close contact, so that the stator 12 can be tightened to the support frame 4 with the bolts 10. When
The tightening force works effectively, and the tightening force does not decrease over time.

In addition, the seating surfaces of the bolt holes of the stator 12 are work-hardened by being pressurized with a press, so when the stator is tightened with the bolts 10, the seats of the bolts 10 become difficult to bite into the stator 12. Therefore, the actual tightening torque, that is, the tightening force is further improved.

Note that the force for pressurizing the bolt holes 13 of the stator 12 is 3 to 5 tons, although it depends on the pressurizing method, and pressurizing is highly effective.

〔Effect of the invention〕

As explained above, in the present invention, the seating surface of the bolt hole of the stator is pressurized in advance before assembly, so there is no gap between the laminated layers of the stator.
Also, since the bearing surface of the bolt hole is work hardened,
Biting of the bolt into the stator is reduced, and the tightening torque of the bolt 10 can be effectively exerted.

Therefore, there is no need to use a special material for the bolt or increase the diameter of the bolt to increase the tightening torque as in the past.

In addition, in the case of a hermetic electric compressor, the bolt holes in the stator are equally divided into four square pitches, and by pressurizing the seat diagonally, it is possible to achieve well-balanced pressurization. There is no variation even when the bolts are tightened, and it is possible to prevent the stator from coming off due to loosening of the bolts.

In addition, in order to pressurize the stator's bolt holes more effectively, when pressurizing the seating surface of the stator's tightening bolt holes, the stator receives this pressure by tightening the bolts to the support frame. It is very good if you receive it in the same way as it was when you received it, as the pressure will be concentrated on this area.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view of a conventional hermetic electric compressor.
Fig. 2 is a perspective view of a part corresponding to part A in Fig. 1, showing the disassembled parts of this part, and Fig. 3 is a perspective view corresponding to Fig. 2 to which the present invention is applied. It is a diagram. DESCRIPTION OF SYMBOLS 1...Airtight container, 2...Compressor part, 3...Electric motor part, 4...Support frame, 5...Hanging spring, 6...Stator, 7...Rotor, 8...Screw hole, 9 ...Bolt through hole, 10...Bolt, 11...Seat surface, 12
...Stator, 13...Bolt through hole.

Claims (1)

[Claims] 1. In a hermetic electric compressor having a structure in which a compressor main body consisting of a compression section, an electric motor section, and a supporting section thereof is elastically suspended in a closed container, a stator having laminated silicon steel plates constituting the electric motor section Tightening bolt through holes provided at four square pitches,
A hermetic electric compressor, characterized in that the electric compressor comprises a seat surface provided by pressurizing the outer periphery of the bolt hole diagonally, and a stator is bolted to the support part through the seat surface.