JPS61241490A - Closed type rotary compressor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hermetic rotary compressor, and particularly to a structure suitable for reducing the height dimension and improving efficiency of the compressor.

[Background of the invention]

The structure of a conventional hermetic rotary compressor will be explained with reference to FIGS. 5 and 6.

An electric element λ is stored in the upper part of the closed container 1, a compression element 1 is stored in the lower part, and refrigeration oil 21 is stored in the bottom part. The electric element consists of a stator 4 and a rotor 5. The rotor 5 is shrink-fitted to a crankshaft 6, which is one of the components of the compression element, and when the rotor 5 rotates, the crankshaft 6 also rotates. A roller 7 or vane 8 rotatably fitted to the eccentric portion of the crankshaft 6 rotates the internal space of a cylinder 9 partitioned into a suction chamber and a discharge chamber.

The cylinder 9 is held between the crank portion of the upper bearing 10 and the flange portion of the lower bearing 11.

Next, the flow of refrigerant will be explained. The refrigerant is sucked in through the suction passage hole 19 provided in the center of the cylinder height and in the radial direction of the cylinder via the accumulator 22 and the suction pipe 20, and is compressed in the internal space of the cylinder 9 by the rotation of the rotor. Afterwards, it is discharged from the discharge valve 12 attached to the lower bearing 11 into the cover 13 fixed to the lower bearing 11, and the lower bearing 11 and the cylinder 9 are discharged.
, ascends the vertical hole 14 passing through the upper bearing 10, is discharged into the closed container 1, passes through the clearance between the stator 4 and the rotor 5, and is discharged from the discharge pipe 15 to the outside of the compressor. In such a structure, when liquid refrigerant is sucked, the vertical hole 1
The liquid refrigerant discharged upward from the rotor 4 is disturbed on the lower surface of the rotor 5, mixes into the stored refrigerating machine oil, causes a forming phenomenon, and is taken out of the compressor together with the refrigerating machine oil or bubbles. Normal lubrication of the sliding parts was no longer possible, which was one of the causes of abnormal wear. Conventionally, in order to improve the above-mentioned drawbacks, a tall accumulator was installed to prevent suction and forming of liquid refrigerant, but in this case, the suction port 23 of the accumulator was positioned higher than the compressor. This caused the height of the refrigeration unit to be increased.

In addition, in order to keep the position of the suction port 23 of the accumulator low, the position of the suction passage hole was simply placed below the center of the cylinder height, but in this case, the refrigerant was Immediately after being sucked into the cylinder, the suction is divided into upper and lower passages with different lengths from the suction passage hole, which causes a reduction in suction efficiency.

Note that related devices of this type include, for example, US Pat. No. 4,240,774.

[Purpose of the invention]

An object of the present invention is to provide a hermetic rotary compressor that has a low accumulator suction port position without reducing suction efficiency.

[Summary of the invention]

In order to achieve such an object, the present invention has a cylinder with a suction passage hole drilled below the center of the cylinder height, and a notch perpendicular to the suction passage hole in a portion of the inner wall of the cylinder where the suction passage hole abuts. By providing this, the position of the accumulator suction port is kept low and the suction efficiency is improved.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4. The same reference numerals as those of the conventional example in FIGS. 5 and 6 indicate the same parts.

The suction passage hole 19 that penetrates in the radial direction of the cylinder in which the suction pipe 20 and the akinimulator 22 are connected is arranged eccentrically by an amount e below the center of the cylinder height. A notched groove 24 having a substantially half-moon cross section orthogonal to the suction passage hole 19 is provided at a location where the passage hole 19 and the cylinder inner wall abut. Here, the inner diameter of the imaginary circle 25 of the semicircular notch groove 24 is larger than the suction passage hole diameter d, and the center θ of this imaginary circle is the suction passage hole 1 in the cylinder.
9 is located on the center line. Also, this half-moon notch groove 2
The width of the groove 4 is approximately the same as the suction passage hole diameter d. That is, the suction passage hole 19 and the half-moon notch groove 24 are in contact with each other at 22 points Pl on the inner wall of the cylinder.

As described above, according to this embodiment, the suction passage hole 19 bored in the radial direction of the cylinder is arranged eccentrically by e below the center of the cylinder height, so that the suction passage hole 19 is connected to the suction passage hole. Since the suction pipe 20 and the f-accumulator 22 can also be configured to be lowered by e, a rotary compressor with a low accumulator suction port can be used.

In addition, although the suction passage hole 19 is eccentrically bored below the center of the cylinder height, a cutout groove with a substantially half-moon cross section is provided at the location where the suction passage hole 19 contacts the inner wall of the cylinder. The refrigerant sucked through the suction passage hole 19 is once diffused into this notched groove and then guided to the suction chamber of the cylinder, providing a highly efficient rotary compressor without reducing suction efficiency. I can do something.

Furthermore, according to the present invention, the virtual inner diameter of the notched groove 24 having a substantially semicircular cross section is larger than the suction passage hole diameter d, and the center θ of this virtual circle is located on the center line of the suction passage hole in the cylinder. ,
The suction passage hole and half-moon notch groove are located on the inner wall of the cylinder.
Since they abut at point P, it is possible to avoid increasing α, which is the invalid angle of suction and compression of refrigerant from the center of the vane to Pl, and at the intersection line P of the half-moon-shaped notch groove and the cylinder inner wall on the opposite side of the vane. Since the angle β formed by the tangent Q of the semicircular notch groove and the tangent 11rR of the cylinder inner diameter can be made obtuse, the bending loss of the refrigerant gas in the P section can be reduced, resulting in a highly efficient compressor. .

〔Effect of the invention〕

As described above, according to the present invention, the position of the accumulator suction port can be kept low without reducing the suction efficiency, so it is possible to provide a hermetic rotary compressor that is highly efficient and has a low height.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the hermetic rotary compressor of the present invention, FIG. 2 is a cross-sectional view taken along the line 1-1 in FIG. 1, and FIG. 4 is a perspective view of the cylinder of the present invention, FIG. 5 is a vertical sectional view of a conventional hermetic rotary compressor, and FIG. 6 is a sectional view taken along the line T in FIG. 19... Suction passage hole, 24... Half-moon notch groove, 25
...Virtual circle of half-moon notch groove. Kaya 1st/J;) 1 Kaya 2 mouth #3 Kaya 5th mouth/J 21

Claims (2)

[Claims] 1. A hermetic rotary compressor consisting of an electric element provided in the upper part of the airtight container, a compression element provided in the lower part of the electric element, and a suction passage hole provided in the cylinder inner wall in the cylinder radial direction. In the above, the suction passage hole is bored below the center of the height of the cylinder, and a cutout groove perpendicular to the suction passage hole is provided in the vertical direction of the cylinder inner wall where the suction passage hole abuts. Features a hermetic rotary compressor. 2. The hermetic rotary compressor according to claim 1, wherein the width of the notch groove is substantially the same as the diameter of the suction passage hole.