JPH04219488A - Closed rotary compressor - Google Patents

Abstract

PURPOSE:To obtain a closed rotary compressor whose operating noise is less without lowering its efficiency by, in the closed rotary compressor used for refrigerating apparatus for a refrigerating cold storage, utilizing the vertical reciprocatory motion of a vane to open and close a pressure leading-in port communicating with a small volume space, and. opening the above port when the vane is pushed clown during a compression stroke to reduce pressure fluctuation occurring in a cylinder compression chamber. CONSTITUTION:A pressure leading-in port 15 provided in a main bearing end plate 5 communicates with a small volume space 16, and is opened to the inside of a cylinder 6 by utilizing the vertical reciprocatory motion of a vane 9 when the vane 9 is pushed down during a compression stroke.

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 in refrigeration equipment such as refrigerator-freezers.

0002

BACKGROUND OF THE INVENTION In recent years, there has been a strong demand for compressors used in refrigerators, refrigerators, etc. to reduce noise. The noise generated by hermetic rotary compressors includes pressure pulsation noise generated when refrigerant gas is sucked, discharge pulsation noise generated when refrigerant gas is discharged, and gas outflow noise.There are ways to reduce these noises.
It is well known to prevent this by providing a muffler in the suction line and the discharge line after the discharge valve.

Further, as a method for reducing the noise generated during gas discharge, there is a structure in which a type of resonator is provided to reduce the noise, as described in Japanese Patent Laid-Open No. 57-46085.

[0004] The structure of Japanese Unexamined Patent Publication No. 57-46085 will be explained below with reference to FIG. In the figure, 6 is a cylinder with a compression chamber (not shown) provided therein, and 7 is a bearing end plate. This bearing end plate 7 closes the end face of the cylinder 6. Reference numeral 13 denotes a discharge port provided in the bearing end plate 7, from which refrigerant gas from the compression chamber is discharged. 14 is a discharge valve that opens and closes the discharge port 13. 20
is 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, although the above configuration is effective in reducing pulsating noise of a specific frequency, it cannot reduce pulsating noise over a wide range. Furthermore, while increasing the small volume increases the noise reduction effect, there is a problem in that the role of efficiency reduction due to re-expansion increases.

[0007] In view of the above problems, the present invention provides a hermetic rotary compressor that more effectively reduces pressure pulsations occurring in a cylinder compression chamber and has quiet operating noise without impairing the efficiency of the compressor. It is something.

[0008]

[Means for Solving the Problems] In order to solve the above problems, the rotary compressor of the present invention compresses refrigerant gas sucked into a closed container from the outside in a compression chamber, and In a hermetic rotary compressor in which the discharge is passed from a discharge notch to the outside of the compression chamber through a discharge port provided in the bearing end plate, a small A small volume space is provided that communicates with the pressure introduction passage opening with a cross-sectional area, and the vertical reciprocating movement of the vane is used to open and close the pressure introduction passage opening with a small cross-sectional area, and when the vane is pushed down during compression, the pressure introduction passage opening and the inside of the cylinder are It is equipped with an opening.

[0009]

[Operation] With the above-described structure, the present invention leads refrigerant gas into the compressor chamber from the suction port of the cylinder, compresses it by the action of the cylindrical piston and vane, and from the discharge gas passage of the cylinder to the discharge port of the bearing end plate. Relatively high-frequency pressure pulsations are generated in the cylinder within the compression chamber during a series of passages of the refrigerant gas that is discharged into the closed container. In order to channel this high-frequency pressure pulsation into the compression chamber, a small cross-sectional area pressure introduction channel opening is formed at a position corresponding to the discharge port and the vane provided on the opposite side of the bearing end plate when the vane is pushed down during compression. Pressure pulsations can be alleviated by the small volume communicating with the compressor, reducing the source of vibration of compressor noise, and reducing noise without impairing the efficiency of the compressor.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2, and components that are the same as those of the prior art will be described using 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 in FIG. In the figure, 1 is a closed container, 2 is a motor element, 2a is a stator, 2
b is the rotor.

Reference numeral 4 denotes a crankshaft, into which a rotor 3 is press-fitted. A main bearing end plate 5 supports the crankshaft 4. 6 is a cylinder, and 7 is a sub-bearing end plate, which is engaged with the main bearing end plate 5 together with the cylinder 6, and the cylinder 6 is fixed in the closed container 1.

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

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

Reference numeral 16 denotes a small volume space communicating with the pressure introduction path port 15. Reference numeral 18 denotes a cover that closes off the small volume space 16 that communicates with the pressure introduction path port 15 .

The operation of the closed type rotary compression constructed as described above will be explained. The refrigerant gas flowing into the compression chamber 10 is compressed as the crankshaft 4 rotates, and the refrigerant gas flows through the discharge notch 12 provided in the cylinder 6 and the sub-bearing end plate 7.
It passes through the discharge port 13 provided in the , pushes up the discharge valve 14 , and is discharged.

Here, the compressed refrigerant gas passes through the discharge valve 14.
When the compressed refrigerant gas remaining in the discharge port 13 or the discharge notch 12 is suddenly discharged into the refrigerant gas in the suction chamber 11 and expands, a relatively high frequency pressure is generated. Pulsation occurs in the compression chamber 10 and suction chamber 11 inside the cylinder 6.

At this time, when the vane 9 is pushed down during compression, a small-volume pressure introduction passageway opening 16 of a small cross-sectional area formed at a position corresponding to the vane 9 provided on the opposite end plate 5 and the discharge port 13 is opened. Space and compression chamber 10 inside the cylinder 6
Since it is formed so as to be open, pressure pulsations can be attenuated and the efficiency of the compressor will not be impaired.

Due to the action of the Helmholtz resonator, the small cross-sectional area of the pressure introduction passage port 16 has an acoustic capacity (cross-sectional area S, length l), and the small volume space 17 has an acoustic capacity (volume V).

Attenuate the pulsating component of the frequency expressed by [Formula 1].

[0020]

Effects of the Invention As described above, the present invention provides a small volume space in the discharge port and the anti-bearing end plate that communicates with the pressure introduction passage opening with a small cross-sectional area formed at a position corresponding to the vane. The vertical reciprocating motion is used to open and close the small cross-sectional area of the pressure introduction passage, and when the vane is pushed down, the small cross-sectional area of the pressure introduction passage and the inside of the cylinder are opened, thereby damping the pressure pulsations that occur during compression and improving the compressor. Noise reduction effect can be obtained without sacrificing efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a hermetic rotary compressor in one embodiment of the present invention.

[Figure 2] A-A sectional view in Figure 1

[Figure 3] Cross-sectional view of main parts of a conventional hermetic rotary compressor

[Explanation of symbols]

1. Airtight container 2　　　　Electric motor element 3 Compressor element 5 Main bearing end plate 6 Cylinder 7 Secondary bearing end plate 8 Piston 9 Vane 10 Compression volume compression side 11 Compression space suction side 13 Discharge port 14 Discharge valve 15 Pressure introduction channel opening 16 Small volume space

Claims (1)

[Claims] 1. A closed 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 inside of the cylinder and an outer diameter of the piston. a vane that partitions a compression space formed by It includes a discharge valve that closes, and a small volume space that communicates with a pressure introduction passage opening of a small cross-sectional area formed at a position corresponding to the discharge port and a vane provided on the side opposite to the bearing end plate, and the vane pushes down during compression. A hermetic rotary compressor, characterized in that the small cross-sectional area pressure introduction passage opening and the inside of the cylinder open when the compressor is opened.