JPS59103977A - Silencer for enclosed type motor compressor - Google Patents

Abstract

PURPOSE:To make a level of vibration reducible over an extensive frequency range, by varying the resonance frequency of a resonator in stages following a frequency component in the pressure pulsation of a fluid. CONSTITUTION:A fluid taken in a cylinder chamber 6 by suction from a suction port by rotation of a piston 5 is compressed inside the cylinder chamber 6, pushes a discharge valve 10 and enters a discharge muffler 12 from a discharge port 11, then fed out of a discharge pipe 14 after passing through a tank chamber 13. Plenum chambers 16a and 16b are partitioned off by each of partition walls 18a and 18b and interconnected alternately with the discharge valve 10 through a passage hole 17 by rotation of a rotary shaft 4 so that a noise is remarkably reduced by a renonator made up of these plenum chambers 16a, 16b and the passage hole 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention is used in air conditioners and the like. In this German compressor, the pressure pulsation of the fluid (refrigerant gas) ejected from the L discharge valve changes depending on changes in the discharge pressure, discharge and velocity, and the crank angle of the cylinder, and its frequency component is expressed by the number 1.
It exists over a wide range from 0 HK to 10 KHz. In order to prevent noise caused by pressure pulsation that changes in frequency components, conventional methods have been used, such as installing a muffler around the discharge port, but this conventional method does not produce noise within a certain frequency range. However, the silencing effect is not sufficient for pressure pulsations in a wide range of frequency components as described above.

An object of the present invention is to provide a hermetic electric compressor equipped with a silencing device that is effective against these wide range of frequency components.

The piston is in sliding contact with the inner wall of a cylinder chamber formed by a cylinder frame of the compressor fixed to the hermetic container, and the cylinder chamber is sealed on both sides of its excursion 2 by round bearings. The bearing has a structure in which the compressed gas has a discharge port equipped with a discharge valve, and the discharge port has a discharge muffler around the discharge port, and the rotary shaft is provided with a plurality of waiting chambers having different volumes, and the hollow chamber is This muffling device for a hermetic electric compressor is characterized in that the bearing is provided with a through hole that communicates with the discharge valve to form a resonator whose resonance frequency changes.

An embodiment of the present invention will be described with reference to FIG. 1 is a sealed container, 2 is an electric motor stator fixed to its inner wall, and 3 is a percentage
A motive rotor, 4 is a rotating shaft, and 5 is a piston fixed to the rotating shaft 4. Reference numeral 6 denotes a cylinder chamber formed by a cylinder frame 7 fixed to the closed container 1, both sides of which are sealed by flange type bearings 8.9, and the piston 5 rotates in sliding contact with the cylinder chamber 6. .

The cylinder chamber 6 has a discharge port 11 provided with a discharge valve 10 in the upper bearing 8, and a discharge muffler 12 is provided around the discharge port 11. Fluid (refrigerant gas) F drawn into the cylinder chamber 6 from a suction port (not shown) by the rotation of the piston 5
i. It is compressed in the cylinder chamber 6, pushes up the discharge valve 10 through the discharge port 11, enters the discharge muffler 12, passes through the tank chamber 13, and is sent out from the discharge pipe 14.

15 is lubricating oil.

In the present invention, the rotary shaft 4 has a cavity 16α having a different volume.
, 16h are provided, and the hollow chambers 16α, 16b and the discharge 77
A through hole 17 is provided in the upper bearing 8 and communicates with the discharge valve 10 in the chamber 12 to form a resonator. Cavity chamber 16α, 16
b is divided by partition walls 18α and 18b, and communicates alternately with the discharge valve 10 through the through hole 17 by rotation of the rotating shaft 4.

[Effects of the Invention] Since the resonator of the present invention has the above structure, the resonant frequency of the resonator changes stepwise in accordance with the frequency component of the pressure pulsation of the fluid that changes as the crank angle of the cylinder changes. Noise can be significantly reduced by the resonator formed by controlling the vibration level over a wide frequency range.Furthermore, the resonant frequency of the resonator is determined by changing the length of the communication path in conjunction with the rotation of the rotating body. It has the advantage that it can be controlled by changing the

[Brief explanation of drawings]

Fig. 1 2 A vertical sectional view of the hermetic electric compressor of the present invention Fig. 2:
Fig. 1 Horizontal sectional view taken along line AE [Symbols] 1... Sealed container, 2... Electric motor stator,
3... Electric motor rotor, 4... Rotating shaft, 5... Piston, 6... Cylinder chamber, 7... Cylinder frame, 8.9... Bearing, 10... Discharge valve, 11 ...Discharge port, 12...Discharge muffler, 13-...Tank chamber, 1
4...Discharge pipe, 15...Lubricating oil, 16α, 16h・
...Cavity chamber, 17...Through hole, 18α, 18b...Bulkhead-1 Patent attorney Masanobu Shibasaki

Claims (1)

[Scope of Claims] 7 runs are in sliding contact with the inner wall of the cylinder chamber formed by the cylinder frame of the compressor fixed to the container, and the cylinder chamber is sealed on both sides by one-type bearings, The bearing has a compressed gas discharge port equipped with a discharge valve, and the discharge port has a discharge muffler around the discharge port, and the rotary shaft is provided with a plurality of hollow chambers having different volumes, and the hollow chamber and A silencer for a hermetic electric compressor, characterized in that a through hole communicating with the discharge valve is provided in the bearing to form a resonator whose resonance frequency changes.