JPH0561475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in freezing and refrigerating equipment and the like.

Conventional configuration and its problems The rotary compressor used in freezing and refrigeration equipment, etc.
A large amount of noise is generated due to pressure fluctuations of the refrigerant compressed within the cylinder. For this reason, conventional methods have been used to reduce noise by installing silencers on bearings, etc. However, since the silencer cannot completely suppress the pressure fluctuation of the refrigerant, the refrigerant hits the discharge cover directly at an approximately right angle. As a result, abnormal noises such as the discharge cover chattering due to refrigerant pressure fluctuations were generated.

The conventional configuration will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is a rotary compressor, 2 is a sealed case, and 3 is a stator, which is fixed to the sealed case 2 by shrink fitting. 4 is the rotor, crankshaft 5
is connected to. 6 is a piston, and 7 is a cylinder. 8 is the bearing on the rotor side, sealed case 2
It is fixed by welding. 9 is a bearing at the end of the shaft, and a valve 10 is mounted on the opposite cylinder surface 9a of the bearing 9.
The recess 1 is formed by the recess 10 and small groove 11 for mounting a.
A recessed portion 12 communicating with 0 is provided. 10b is a valve hole. 13 is a partition plate interposed between the bearing 9 and the cup-shaped discharge cover 14. This partition plate 13 allows these recesses 10 and recesses 12
and the small groove 11 respectively form a valve chamber 10c, an expansion chamber 12a, a small passage 11a that communicates the valve chamber 10c and the expansion chamber 12a, and a discharge chamber 14a formed by the discharge cover 14 and the partition plate 13. Further, the partition plate 13 is provided with a hole 15 at a position corresponding to the concave portion 12, which communicates the expansion chamber 12a with the discharge chamber 14a.

In this configuration, the refrigerant compressed within the cylinder 7 is discharged from the valve hole 10b into the valve chamber 10c. Furthermore, the refrigerant is ejected from the small passage 11a to the expansion chamber 12a, is discharged from the small hole 15 into the discharge chamber 14a, and is further discharged into the sealed case 2 from the discharge chamber 14a. In this way, the refrigerant compressed within the cylinder 7 passes through the expansion chamber 12a before being discharged into the closed case 2 via the discharge chamber 14a. Therefore, the pressure fluctuation component of the refrigerant generated within the cylinder 7 is attenuated by the expansion type silencing effect when the refrigerant passes through the valve chamber 10c and the expansion chamber 12a, so that the refrigerant radiated into the sealed case 2 is reduced. The pressure fluctuation component of is reduced, and the compressor noise is reduced.

However, such a muffler cannot completely suppress pressure fluctuation components of the refrigerant. Therefore, the refrigerant passes through the small holes 15 into the discharge chamber 14.
The refrigerant discharged from the small holes 15 directly hits the discharge cover 14 at a substantially right angle, causing the discharge cover 14 to vibrate due to pressure fluctuations of the refrigerant, thereby generating abnormal noise. There was a problem.

OBJECTS OF THE INVENTION It is an object of the present invention to suppress the occurrence of abnormal noise such as chatter of a discharge cover due to pressure fluctuations of a refrigerant.

Structure of the Invention In order to achieve this object, the present invention provides a small hole formed in a partition plate to communicate a discharge chamber and an expansion chamber, and a substantially conical projection provided in the discharge chamber facing the small hole. By providing this, the refrigerant discharged from the small hole is prevented from hitting the discharge cover at a substantially right angle, and the generation of abnormal noise such as chattering of the discharge cover due to pressure fluctuations of the refrigerant is suppressed.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Incidentally, in order to avoid duplication of explanation, the same parts as in the conventional example are given the same reference numerals and detailed explanation will be omitted.

Reference numeral 16 denotes a discharge cover, which has a substantially conical projection 17 projecting in the direction of the small hole 15 at a position corresponding to the small hole 15 of the partition plate 13 . A discharge chamber 16a is formed by the partition plate 13 and the discharge cover 16.

In such a configuration, the refrigerant compressed within the cylinder 7 flows from the valve hole 10b to the valve chamber 10c.
It is further discharged into the expansion chamber 12 from the small passage 11a.
a, from the small hole 15 to the discharge chamber 16
It is discharged to a. At this time, since the projection 17 is provided on the discharge cover 16, the refrigerant discharged from the small hole 15 changes from a linear flow to a spiral flow, and hits the discharge cover 16 at an acute angle of incidence. become.

In this way, the valve chamber 10c, the small passage 11a,
The refrigerant having a pressure fluctuation component that has not been sufficiently attenuated by the expansion chamber 12a is removed by the discharge cover 16.
, the discharge cover 16 will not vibrate even if there is a pressure fluctuation component. Therefore, the chatter noise of the discharge cover 16 and the vibration of other parts caused by the chatter of the discharge cover 16 will be reduced. It becomes possible to suppress the occurrence of abnormal noise due to resonance.

Effects of the Invention As described above, the present invention houses an electric compression element in a sealed case, and has a small hole formed in a partition plate that communicates a discharge chamber and an expansion chamber, and a small hole in the discharge chamber facing the small hole. In a configuration having an expansion chamber for attenuating the pressure pulsation component of the refrigerant, the refrigerant discharged from the small hole hits the discharge cover at an acute angle of incidence. As a result, the discharge cover will not vibrate due to the pressure pulsation component that has not been damped completely, and the generation of abnormal noise such as the chattering sound of the discharge cover and resonance of other parts due to the chatter of the discharge cover can be suppressed. This makes it possible to provide a quieter rotary compressor.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional rotary compressor, FIG. 2 is an exploded perspective view showing the bearing, partition plate, and discharge cover of the compressor, and FIG. 3 is a rotary compressor showing an embodiment of the present invention. FIG. 4 is an exploded perspective view of the bearing, partition plate, and discharge cover of the compressor in the above embodiment. 7... Cylinder, 9... Bearing, 13... Partition plate, 15... Small hole, 16... Discharge cover, 17...
…protrusion.

Claims (1)

[Claims] 1. An electric compression element housed in a sealed case,
A discharge cover provided on the opposite-cylinder surface of the bearing of the electric compression element via a partition plate, a discharge chamber formed by the discharge cover and the partition plate, and an internal portion provided on the opposite-cylinder surface of the bearing. a recess in which a valve is disposed, a recess that communicates with the recess, an expansion chamber formed by the recess and the partition plate, and a small space formed in the partition plate that communicates the discharge chamber with the expansion chamber. A rotary compressor, the rotary compressor having a hole, and a substantially conical projection provided in the discharge chamber facing the small hole.