JPS6347919B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotary hermetic compressor,
The present invention relates to a rotary hermetic compressor suitable for increasing the rigidity of the cylinder and preventing deformation of the groove in which the partition plate is inserted.

[Background of the invention]

First, the conventional rotary hermetic compressor was
This will be explained with reference to the figures and FIG.

FIG. 1 is a longitudinal sectional view of a conventional rotary hermetic compressor, and FIG. 2 is a sectional view taken along the line A-A in FIG.

In the figure, 1 is a closed cylindrical case, 2 is an electric element, and 3 is a compression element connected to the electric element 2 by a rotating shaft 6.

The electric element 2 includes a stator 4 and a rotor 5, and the rotor 5 is shrink-fitted to a rotating shaft 6.

The compression element 3 includes a roller 8 fitted to an eccentric portion 7 of a rotating shaft 6, a cylinder 12 having a cylinder chamber 9 in which the roller 8 rotates, and a groove 1 provided in the cylinder 12.
The cylinder 12 is composed of a partition plate 10 which is inserted into the cylinder 3 and slides in a groove 13 as the roller 8 rotates, and an upper bearing 14 and a lower bearing 15 which are in contact with the upper and lower sides of the cylinder 12.

As shown in the figure, an electric element 2 is disposed in the upper part of the closed cylindrical case 1, and a compression element 3 is disposed in the lower part, and the upper bearing 14 of the compression element 3 is fixed to the closed cylindrical case 1 by welding. Lower bearing of compression element 1
5 parts are immersed in an oil reservoir at the bottom of the sealed cylindrical case 1. 11 is a suction pipe for refrigerant gas, and 16 is a discharge pipe. The assembly process of the rotary hermetic compressor described above will be explained. Case 1 is made by bending a flat plate into a cylindrical shape, and then welding legs for supporting the compressor to the outer periphery of case 1. Thereafter, the stator 4 is press-fitted into the case 1 and fixed. On the other hand, a rotor 5 is attached to one end of the rotating shaft 6.
is press-fitted, and the upper bearing 14, cylinder 12, and lower bearing 15 are attached to the other end to form the compression element 3. The compression element 3 is inserted into the cylindrical case 1, and the upper bearing 14 is welded from the outer peripheral side of the case 1. At this time, cylinder 12
cylinder 1 so that there is a gap between case 1 and cylinder 12 in order to avoid the thermal effects of welding.
The outer diameter of case 2 is smaller than the inner diameter of case 1. Thereafter, the assembly of the compressor is completed by attaching lids to the top and bottom of the cylindrical case 1.

Now, when the rotor 5 rotates, the roller 8 fitted on the eccentric part 7 of the rotating shaft 6 rotates in the cylinder chamber 9, and refrigerant gas flows from the suction pipe 11 into the cylinder chamber 9 divided by the partition plate 10. It is inhaled, compressed, and discharged into the sealed cylindrical case 1. The refrigerant gas further rises through the gap between the electric elements 2 and is discharged from the discharge pipe 16 on the upper surface of the closed cylindrical case 1 to the piping system of the refrigeration cycle.

In such a rotary hermetic compressor, the thickness of the cylinder 12 in the radial direction at the top dead center position of the partition plate 10 is not taken into account, so the rigidity is insufficient and the partition plate 10 is not inserted into the cylinder 12. When processing the groove 13 and when assembling the compression element, the groove 13 was deformed, and the clearance between the partition plate 10 and the groove 13 sometimes changed.

If the clearance between the partition plate 10 and the groove 13 is unstable and narrow, the lubricating oil film will not be completely formed and seizure will occur; if the clearance is wide, the groove 13
There was a drawback that the partition plate 10 caused abnormal vibrations and localized wear became large. A means to solve this problem is to increase the thickness of the cylinder. however,
The thickness cannot be increased within a predetermined inner diameter of the case.

[Purpose of the invention]

The present invention has been made in order to improve the above-mentioned drawbacks by increasing the rigidity of the cylinder near the dead center of the partition plate in the compression element, and by minimizing the deformation of the cylinder groove in which the partition plate is inserted. The purpose of the present invention is to provide a rotary hermetic compressor that can prevent seizing of partition plates, abnormal vibrations, and local wear.

[Summary of the invention]

The rotary type hermetic compressor according to the present invention has a structure that includes an electric element, an upper bearing connected to the electric element by a rotating shaft, a cylinder, a roller, and a roller inserted in a groove of the cylinder in a hermetically sealed cylindrical case. A rotary hermetic compressor, which is provided with a partition plate that slides as the roller rotates, and a compression element consisting of a lower bearing, and in which the upper bearing is welded and fixed to the hermetically sealed cylindrical case, Welding the upper bearing and the sealed cylindrical case,
The sealed cylindrical case is welded at at least three locations on the circumference, and the cylinder is positioned approximately in the center of two of the welded locations so that the dead center of the partition plate faces each other. It is.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 3 and 4 as well as FIG. 1 above.

FIG. 3 is a sectional view of the cylinder portion of a rotary hermetic compressor according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram of a modification of the hermetic cylindrical case, etc. in FIG. Components with the same reference numerals as those in FIGS. 1 and 2 are the same parts as in the prior art, so their explanation will be omitted.

In FIG. 3, the upper bearings 14 are welded and fixed at three equal intervals on the inner circumference of the closed cylindrical case 1 at 120° intervals.

A cylinder 22 has a cylinder chamber 9. A partition plate 20 is inserted into a groove 23 formed in the cylinder 22 so as to be slidable along the groove 23 via a spring 21. This partition plate 20
is a roller 8 fitted to the eccentric portion 7 of the rotating shaft 6
As it rotates in the cylinder chamber 9 as the rotary shaft 6 rotates, it slides along the groove 23 and moves back and forth in the left and right directions in the figure. The limits of the forward and backward stroke are called top and bottom dead centers. The spring 21 has one end fixed to the partition plate 20 and the other end fixed to the upper bearing 14, and allows the partition plate 20 to perform the sliding movement.

The cylinder 22 has its side portion 22a in contact with the inner periphery of the sealed cylindrical case 1, and the upper bearing 14
is fixed.

In particular, in this embodiment, the above-mentioned upper bearing 14
The cylinder 22 is positioned approximately at the center of two of the welding points spaced apart by 120 degrees between the cylinder 22 and the closed cylindrical case 1 so that the top dead center of the partition plate 10 faces each other.
Reference numeral 24 denotes a plurality of compressor fixtures provided at positions corresponding to the positions of the cylinders 22 on the outer periphery of the sealed cylindrical case 1;
Three protrusions 2 arranged in parallel on the outer periphery of the sealed cylindrical case 1
Welded through 5.

In particular, in this embodiment, three
One of the compressor fixtures 24 24-1 is
It is welded to the outer periphery of the sealed cylindrical case 1 corresponding to the outside of the cylinder side portion 22a where the top dead center of the partition plate 20 described above is located.

FIG. 4 shows an exaggerated state of the closed cylindrical case 1 welded in this way.

In Fig. 4, the broken line 1 indicates the perfect circle before deformation of the sealed cylindrical case, and the solid line 1' indicates 3
It shows the deformation of the sealed cylindrical case 1 when two compressor fixtures 24, 24-1 are welded, and the case 1 shown in FIG.
Due to the deformation, the welded portions of the compressor fixtures 24, 24-1 become larger outwardly. In this embodiment, the outwardly increasing portion, that is, the three compressor fixtures 24, 24-
The cylinder 22 with the cylinder side part 22a thickened outward is housed in the case so as to face one of the welded parts of the case 1 and to contact the inner peripheral surface of the case 1. be.

As shown in the figure, if the center of the cylinder 22 is O, the outer end of the cylinder side portion 22a is A', and the radius OA of the perfect circle of the closed cylindrical case 1 is r, then OA'>r.

That is, from the center O of the cylinder 22 to the partition plate 2
0 dead center, and the outer end of the cylinder side part 22a.
The length to A′ is the inner radius r of the closed cylindrical case 1.
The thickness of the cylinder side portion 22a in the radial direction near the top dead center of the partition plate 20 is the maximum,
Both when processing the cylinder 22 and when assembling the compression element 3, the amount of deformation of the groove 23 is extremely small because the rigidity of the cylinder 22 is increased. In other words, case 1 has fixture 2.
By welding 4, the welded portion is deformed outward of the case 1. Due to this deformation, a gap is created between the deformed portion of the case 1 and the cylinder side portion 22a, so that the cylinder side portion 22a near the groove can be made thicker outward to compensate for this gap.

According to this embodiment, since the rigidity of the cylinder side portion 22a near the top dead center of the partition plate 20 is increased, the deformation of the groove 23 can be made extremely small, so that the difference between the partition plate 20 and the groove 23 is Seizure due to poor clearance, abnormal vibration, and localized large wear are completely eliminated, resulting in significantly improved reliability.

Furthermore, when the compressor fixture 24-1 is welded to the outside of the closed cylindrical case 1 opposite to the top dead center of the partition plate 20, the tension of the closed cylindrical case 1 at that location is released, and the amount of deformation becomes even larger. Therefore, if the compressor fixture 24 is welded with the three-point protrusion 25, the center portion of the three points will be pulled outward, so the amount of deformation will become larger and the thickness of the cylinder side portion 22a near the top dead center will increase. Rigidity can be further increased, and groove 2
3 becomes difficult to deform. Therefore, a gap is previously formed between the case 1 and the cylinder 22,
Due to the increased thickness within this gap, the compression element can be accommodated within the case 1.

In addition, in the above embodiment, the upper bearing 14
An example has been described in which welding is performed at three locations at 120° intervals on the inner circumference of the sealed cylindrical case 1, but the present invention
The welding is not limited to this, and there is no problem in welding at three or more locations. It is only necessary to position the cylinder side portion 22a so that the dead center of the partition plate 20 faces approximately the center of two of the plurality of welding locations.

Similarly, in the above embodiment, an example was explained in which three compressor fixtures 24 were welded to the outer periphery of the cylinder 22 disposed portion of the sealed cylindrical case 1, but the present invention is not limited to this. , it is acceptable to provide compressor fixtures at three or more locations.

At least one compressor fixture 24-1,
It is sufficient if it is provided on the outside of the sealed cylindrical case 1 facing the dead center of the partition plate 20.

〔Effect of the invention〕

As described above, according to the present invention, the rigidity of the cylinder near the dead center of the partition plate in the compression element is increased, and the deformation of the groove of the cylinder in which the partition plate is inserted is made extremely small, thereby preventing seizure of the partition plate. Therefore, it is possible to provide a rotary hermetic compressor that can prevent abnormal vibrations and local wear.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a conventional rotary hermetic compressor, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a rotary type compressor according to an embodiment of the present invention. A cross-sectional view of the cylinder part of a hermetic compressor,
FIG. 4 is a conceptual diagram of a modification of the closed cylindrical case, etc. of FIG. 3. 1... Sealed cylindrical case, 2... Electric element, 3...
... Compression element, 6 ... Rotating shaft, 8 ... Roller, 9 ...
...Cylinder chamber, 14...Upper bearing, 15...
Lower bearing, 20... Partition plate, 22... Cylinder, 22a... Cylinder side, 23... Groove, 2
4, 24-1...Compressor fixture, 25...Protrusion.

Claims (1)

[Claims] 1. A rotary comprising a fixture welded to the outer periphery of a cylindrical case, a cylinder housed in the case, a groove provided in the cylinder, and a partition plate slidably provided in the groove. In the rotary type hermetic compressor, the cylinder is provided with a portion provided with the groove at a position facing the fixture and in contact with an inner circumferential surface of the case. Hermetic compressor.