JP2956710B2 - Hermetic rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary compressor used for a refrigerator such as a refrigerator.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for compressors used in refrigerators and refrigerators, especially for noise reduction. Noise generated by the hermetic rotary compressor includes pressure pulsation noise generated when refrigerant gas is sucked, discharge pulsation noise generated when refrigerant gas is discharged, and gas outflow noise.
It is well known that a silencer is provided in a suction line or a discharge line after a discharge valve to prevent such a problem.

As a method of reducing noise generated during gas discharge, there is a method of reducing noise by providing a kind of resonator as disclosed in Japanese Patent Application Laid-Open No. 57-46085.

[0004] The structure of JP-A-57-46085 will be described below with reference to FIG. In the figure, reference numeral 6 denotes a cylinder, in which a compression chamber (not shown) is provided. Reference numeral 7 denotes a bearing end plate. The bearing end plate 7 closes the end surface of the cylinder 6. Reference numeral 13 denotes a discharge port provided in the bearing end plate 7, and is a portion from which the refrigerant gas is discharged from the compression chamber. Reference numeral 14 denotes a discharge valve that opens and closes the discharge port 13. 20
Denotes a resonator provided on the bearing end plate 7.

In such a conventional hermetic rotary compressor, the pulsating noise of the refrigerant gas discharged from the compression chamber enters the resonator 20, and the pulsating noise is reduced by the resonator.

[0006]

However, the above arrangement is effective in reducing the pulsation sound of a specific frequency, but cannot reduce the pulsation sound in a wide range. In addition, when the small volume is increased, the noise reduction effect is enhanced, but there is a problem that the role of the efficiency reduction due to the re-expansion increases.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a hermetic rotary compressor that reduces pressure pulsation generated in a cylinder compression chamber more effectively and does not impair the efficiency of the compressor, and that operates quietly. Things.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a rotary compressor of the present invention compresses a refrigerant gas sucked from the outside into a closed container in a compression chamber, and closes the vicinity of a vane groove provided in a cylinder. In a hermetic rotary compressor in which a discharge port provided in a bearing end plate is passed through a discharge notch and discharged to the outside of a compression chamber, a small hole formed at a position corresponding to a vane is formed on a discharge port and a side opposite to a bearing end plate. A small-volume space is provided in communication with the pressure introduction port of the cross-sectional area, and the vertical reciprocating motion of the vane is used to open and close the pressure introduction path of the small cross-section. Is provided with an opening.

[0009]

According to the present invention, refrigerant gas is introduced into the compressor chamber from the intake port of the cylinder, compressed by the action of the cylindrical piston and the vane, and is discharged from the discharge gas passage of the cylinder to the discharge port of the bearing end plate. In the compression chamber, a relatively high frequency pressure pulsation is generated in the cylinder during the passage of a series of refrigerant gas discharged through the airtight container. In order to open the high-frequency pressure pulsation into the compression chamber, when the vane is pressed down during compression, a pressure introduction passage port having a small cross-sectional area formed at a position corresponding to the discharge port and the vane provided on the side opposite to the bearing end plate. The pressure pulsation can be reduced by the small volume that communicates with the compressor, the excitation source of the compressor noise can be reduced, and the noise can be reduced without impairing the efficiency of the compressor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same components as those of the prior art will be described with the same reference numerals.

FIG. 1 is a sectional view of a hermetic rotary compressor according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. In the figure, 1
Is a closed container, 2 is a motor element, 2a is a stator,
2b is a rotor.

Reference numeral 4 denotes a crankshaft on which the rotor 3 is press-fitted. Reference numeral 5 denotes a main bearing end plate, which supports the crankshaft 4. Reference numeral 6 denotes a cylinder, and 7 denotes an auxiliary bearing end plate, which is engaged with the cylinder 6 on the main bearing end plate 5, and the cylinder 6 is fixed to the inside of the closed vessel 1.

Reference numeral 8 denotes a piston fitted on the crankshaft 4. 9 is a vane. Reference numeral 10 denotes a compression chamber, and 11 denotes a suction chamber, which is formed by partitioning an inner space of the cylinder 6 with a vane 9. Reference numeral 12 denotes a discharge notch, which is provided in the cylinder 6.

A discharge port 13 is provided on the sub-bearing end plate 7. A discharge valve 14 opens and closes the discharge port 13. The discharge valve 14 is locked to the sub bearing end plate 7. Reference numeral 15 denotes a pressure introduction port formed in the main bearing end plate 5, provided on the main bearing end plate 5 corresponding to the vane 9, and opened and closed by the reciprocating motion of the vane 9.

Reference numeral 16 denotes a small volume space communicating with the pressure introduction port 15. Reference numeral 18 denotes a cover for closing the small volume space 16 communicating with the pressure introduction port 15.

The operation of the thus-configured hermetic rotary compression will be described. The refrigerant gas flowing into the compression chamber 10 is compressed as the crankshaft 4 rotates, and the discharge notch 12 and the sub-bearing end plate 7 provided in the cylinder 6 are provided.
The discharge valve 13 is pushed up and discharged through a discharge port 13 provided in the nozzle.

Here, the compressed refrigerant gas is supplied to the discharge valve 14.
At a relatively high frequency when the pressure is increased and the refrigerant gas is rapidly discharged or when the compressed refrigerant gas remaining in the discharge port 13 or the discharge notch 12 is rapidly discharged into the refrigerant gas in the suction chamber 11 and expanded. Pulsation is generated in the compression chamber 10 and the suction chamber 11 in the cylinder 6.

At this time, when the vane 9 is pushed down at the time of compression, a small volume of a small volume communicating with the discharge port 13 and the pressure introduction passage port 16 having a small sectional area formed at a position corresponding to the vane 9 provided on the opposite bearing end plate 5. Space and compression chamber 10 in cylinder 6
The pressure pulsation can be attenuated, and the efficiency of the compressor is not reduced.

By the action of a Helmholtz resonator in which the pressure introduction passage 16 having this small cross-sectional area has an acoustic capacity (cross-sectional area S, length 1) and the small volume space 17 has an acoustic capacity (volume V).

[Expression 1] A pulsation component having a frequency represented by the following equation is attenuated.

[0020]

As described above, according to the present invention, the discharge port and the counter-bearing end plate are provided with a small-volume space communicating with the pressure introduction passage port having a small cross-sectional area formed at a position corresponding to the vane. The vertical reciprocating motion is used to open and close the pressure introduction passage with a small cross-sectional area.When the vane is pushed down, the pressure introduction passage with a small cross-sectional area and the inside of the cylinder are opened, thereby attenuating the pressure pulsation generated during compression and compressing The noise reduction effect can be obtained without impairing the efficiency of the device.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic rotary compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view of a main part of a conventional hermetic rotary compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Motor element 3 Compressor element 5 Main bearing end plate 6 Cylinder 7 Sub-bearing end plate 8 Piston 9 Vane 10 Compression space compression side 11 Compressed space suction side 13 Discharge port 14 Discharge valve 15 Pressure introduction port 16 Small volume space

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F04C 23/00-29/10 331

Claims (1)

(57) [Claims] 1. An airtight container, an electric motor element, a compressor element driven by the electric motor element, a cylindrical piston provided inside a cylinder of the compressor element, an inner diameter of the cylinder and an outer diameter of the piston A vane that partitions the compression space formed by the compression side and the suction side, a bearing end plate disposed at both ends of the cylinder so as to close the cylinder, a discharge port of the bearing end plate, and a discharge port of the bearing end plate. A discharge valve to be closed, and a small-volume space communicating with a pressure introduction passage port having a small cross-sectional area formed at a position corresponding to the vane provided on the side of the discharge port and the opposite bearing end plate, and the vane is pushed down during compression. A hermetic rotary compressor characterized in that when it is opened, the pressure introduction passage opening of the small cross-sectional area and the inside of the cylinder are opened.