JPH03258995A - Sealed type rotary electric compressor - Google Patents

Abstract

PURPOSE:To prevent the generation of columnar resonance to reduce noise by providing a communicating hole for communicating a space enclosed by a cap body and a compressor element to the discharge part of the compressor element to form a resonance type silencer. CONSTITUTION:A closely fixed cap body 5 is provided on the electric motor element side of a compressor element 3. A communicating hole 7 for communicating a space 6 enclosed by a cap body 5 and the compressor element 3 to the discharge part 4 of the compressor element 3 is provided. In a sealed type horizontal rotary electric compressor, a resonance type silencer is formed by the cap body 5, the space 6 and the communicating hole 7 at the time of operation to silence the frequency component of the pulsation of a discharge gas, so that no columnar resonance occur. Hence, noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic rotary electric compressor used in refrigeration equipment such as refrigerator-freezers.

BACKGROUND OF THE INVENTION In recent years, hermetic rotary electric compressors have been widely used in refrigeration equipment such as refrigerator-freezers.

A conventional hermetic rotary electric compressor will be described below, taking a hermetic horizontal rotary electric compressor as an example.

FIG. 2 shows a conventional hermetic horizontal rotary electric compressor. In FIG. 2, 1 is a closed case, 2 is a motor element, 3 is a compressor element, and 4 is a discharge section.

In the above configuration, when the compressor element 3 is driven by the electric motor element 2 and performs a compression action, the discharged gas is discharged to the side of the compressor element 3 opposite to the electric motor element.

Problems to be Solved by the Invention However, in the above-mentioned conventional configuration, since the closed case is the excitation source, air column resonance of a specific frequency occurs in the space inside the closed case, and the air column resonance sound causes the closed case to be damaged. The horizontal rotary electric compressor had the problem of increasing noise.

The present invention solves the above-mentioned conventional problems and provides a hermetic rotary electric compressor with less noise.

Means for Solving the Problems In order to achieve this object, the hermetic rotary electric compressor of the present invention includes a lid closely fixed to the motor element side of the compressor element, and the lid and the compressor The element has a communication hole which communicates the quadruple space with the discharge part of the compressor element and whose length and cross-sectional area are expressed by the following formula.

1=■・(2”f)・l c However, l: Length of communicating hole (m) (including opening end correction), S
: Cross-sectional area of the communicating hole Cd), f: Resonance frequency of the space inside the sealed case (Hz), C: Sound velocity (m/5llIC), ■: Volume of the space surrounded by the lid and the compression element (-) This configuration forms a resonant muffler, and prevents the frequency component of the pulsation of the discharged gas, which is the source of excitation of the air column resonance generated within the sealed case, from being discharged into the sealed cane, thereby preventing air column resonance from occurring. do not have.

EXAMPLE Hereinafter, as an example of the present invention, a hermetic horizontal rotary electric compressor will be described with reference to the drawings.

Components that are the same as those in the conventional example will be described using the same reference numerals, and portions that are the same in structure and operation will be omitted. In FIG. 1, 5 is a lid closely fixed to the motor element side of the compressor element 3, 6 is a quadruple space between the lid 6 and the compressor element 3, and 7 is the compressor element 3.
This is a communication hole that is bored in the space and communicates with the discharge part 4, and whose length and cross-sectional area are expressed by the following formula.

s=■・(4")・(j c However, l: Length of communication hole (m) (including opening end correction), S
: Cross-sectional area of the communicating hole (-), f: Resonance frequency of the space inside the sealed case (Hz), C:
Sound velocity (m/5ec) V: Volume of space surrounded by lid and compressor element (,/)
When the closed horizontal rotary electric compressor configured as described above is operated, a resonant muffler is formed by the lid 6, the space 6, and the communication hole 7, and the air column resonance generated in the closed case is excited. It mutes the frequency component of the pulsation of the discharged gas, which is the source of the noise.
Since the air is not discharged into the sealed case, air column resonance does not occur. Therefore, it is possible to provide a closed horizontal rotary electric compressor with extremely low noise.

In this embodiment, the communication hole was a hole drilled in the compression element, but the communication hole may be passed through the outside of the compressor element using a pipe. Further, the length and cross-sectional area of the communication hole may be adjusted by adding an appropriate pipe. Further, in this embodiment, a closed horizontal rotary electric compressor is used as an example, but a closed vertical rotary electric compressor may also be used.

Advantages of the Invention As described above, the present invention includes a lid closely fixed to the motor element side of a compressor element, and a quadruple space between the lid and the compressor element, and a discharge part of the compressor element. A resonant silencer is formed by providing a communication hole that communicates with the compressor, and air column resonance that occurs in the space inside the closed canister is not generated, making it possible to realize a low-noise closed-type rotary electric compressor. It is.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hermetic horizontal rotary electric compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional hermetic horizontal rotary electric compressor. 6... Lid body, 6... Space, 7...
・Communication hole.

Claims (1)

[Scope of Claims] A motor element disposed within a sealed case; a compressor element disposed within the sealed case, driven by the motor element, and having a discharge portion on a side opposite to the motor element; and the compressor. a lid closely fixed to the motor element side of the element, the space surrounded by the lid and the compressor element communicates with the discharge part of the compressor element, and the length and cross-sectional area are as follows: A closed-type rotary electric compressor with communication holes represented by. S/l=V・(2πf/c)^2 However, l: Length of communication hole (m) (including opening end correction), S
: Cross-sectional area of the communication hole (m^2), f: Resonance frequency of the air in the sealed case (Hz), c: Sound velocity (m/sec), V: Space surrounded by the lid body and the compressor element Volume (m^3
),