Compressor Suction Pipe Vibration Reduction via Outlet Orientation
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Solution Overview
Problem
Conventional compressors experience significant vibrations in the suction pipe and accumulator due to resonance of refrigerant gas, as the direction connecting the outlets coincides with the natural vibration modes of the suction pipe, leading to unwanted oscillations and pulsations.
Innovation Solution
The compressor design shifts the direction connecting the outlets relative to the natural vibration modes of the suction pipe, ensuring that the first and second directions do not coincide, and all gas channels have equal acoustic characteristics to cancel pulsations and suppress resonance, employing a double-deck muffler configuration with releasably engaged muffler covers to reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the direction connecting the outlets coincides with the natural vibration modes of the suction pipe, then the structure is simple and easy to manufacture, but significant vibrations occur in the suction pipe and accumulator due to resonance
Solution Approach 1:
The patent applies asymmetry by deliberately designing the outlet arrangement such that the direction connecting the two outlets does not coincide with the natural vibration modes (first direction along the central axis, second direction perpendicular to it) of the suction pipe. This asymmetric angular relationship prevents resonance between the discharged refrigerant gas and the suction pipe, reducing vibrations in the suction pipe and accumulator while maintaining manufacturing simplicity.
2Power
If the refrigerant gas is discharged from outlets with great pressure amplitude in resonant mode, then the compression function is effective, but the resonance causes vibrations that propagate to the closed vessel
Solution Approach 1:
The patent converts the harmful resonance effect into a beneficial outcome by utilizing the resonant mode's pressure amplitude characteristics. By positioning the outlets such that their connecting direction does not align with the suction pipe's natural vibration modes, the patent allows the refrigerant gas to maintain effective compression power while the resonance vibrations are directed away from the suction pipe, preventing harmful vibration propagation to the closed vessel.
3Object-affected harmful factors
If the gas channels have equal acoustic characteristics, then the pulsations can mutually cancel in the closed vessel, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by ensuring that the gas channels from each suction mouth to all outlets have equal acoustic characteristics, specifically matching their lengths and cross-sectional shapes. This localized precision in the gas channel design enables the pulsations of refrigerant gas from different channels to mutually cancel each other in the closed vessel, reducing overall gas pulsations while maintaining feasible manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces vibrations in the suction pipe and accumulator by decoupling the resonant mode from the natural vibration modes, further suppressing refrigerant gas pulsations and resonance, particularly effective with high-pressure refrigerants like carbon dioxide.
Implementation Method 1
gas channels from each suction mouth to all the outlets have generally mutually equal acoustic characteristics
Implementation Method 2
the refrigerant gas discharged from the outlets resonates in the closed vessel
Implementation Method 3
the direction that connects the two outlets is the direction in which the pressure amplitude in the resonant mode of the discharged refrigerant gas is great
Implementation Method 4
the first direction and the second direction are the directions in which the oscillation amplitude in the natural vibration mode of the suction pipe is great
Data Source
Figure 1
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AI summary
A second muffler cover (240) of a compression element (2) has two hole portions (240a) that discharge a refrigerant gas into a closed vessel (1). A suction pipe (11) that sucks the refrigerant gas is attached to the closed vessel (1). A first direction (D1) and a second direction (D2) of natural vibration mode of the suction pipe (11) do not coincide with a direction (D0) that connects the two hole portions (240a). Therefore, even if the refrigerant gas discharged from the compression element (2) resonates in the closed vessel (1), vibrations of the suction pipe (11) can be reduced.