Piston compressor and portable refrigerator comprising same
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Solution Overview
Problem
Piston compressors, especially those used in portable refrigerators, generate significant vibration and noise due to high-pressure gas discharge, which is exacerbated by the limited size and volume constraints, leading to ineffective noise reduction with traditional discharge mufflers.
Innovation Solution
The piston compressor incorporates multiple gas discharge paths that diverge from the cylinder head high-pressure chamber, passing through various guide holes and channels to the crankcase discharge hole, creating counteracting effects that reduce gas pulsation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a discharge muffler with large volume is used to reduce noise and vibration, then noise reduction effect is improved, but the overall size and volume of the piston compressor increases
Solution Approach 1:
The gas discharge path is segmented into multiple separate paths (first gas discharge path, second gas discharge path, third gas discharge path) instead of using a single discharge path. This segmentation allows the gas flow to be divided and discharged through different routes, creating counteracting effects that reduce vibration and noise without requiring a large-volume discharge muffler.
2Volume of stationary object
If the piston compressor size is reduced for portable applications, then portability is improved, but noise and vibration control becomes ineffective
Solution Approach 1:
The discharge system is segmented into multiple paths with different lengths and configurations. The first gas discharge path goes through the crankcase channel and crankcase discharge hole, the second path goes through the cylinder head discharge hole directly, and the third path combines elements of both. This segmentation enables noise and vibration control within a compact compressor design.
Solution Approach 2:
The invention addresses noise and vibration control in the spatial dimension by creating three-dimensional discharge paths with different lengths and orientations. The gas flows through paths with varying geometries (different hole diameters, path lengths, and routing configurations) to create counteracting pressure waves and reduce pulsation effects, achieving noise control without increasing overall compressor volume.
3Device complexity
If gas is discharged along a single path, then the discharge structure is simple, but gas pulsation causes significant vibration and noise
Solution Approach 1:
The single gas discharge path is segmented into multiple parallel paths (first, second, and third gas discharge paths) with different lengths and configurations. The first path includes the crankcase channel and crankcase discharge hole, the second path includes the cylinder head discharge hole, and the third path combines elements of both. This segmentation creates counteracting effects that reduce gas pulsation and associated vibration and noise.
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
The multiple discharge paths significantly reduce vibration and noise during operation by counteracting gas pulsation, maintaining a compact design without the need for larger mufflers.
Implementation Method 1
the difference of travel between the plurality of gas discharge paths forms a counteracting effect, which significantly reduces gas pulsation
Implementation Method 2
significantly reduces gas pulsation, so as to reduce vibration and noise of the piston compressor during operation
Implementation Method 3
reduce vibration and noise of the piston compressor during operation
Data Source
AI summary
A piston compressor and a portable refrigerator. The portable refrigerator comprises a piston compressor, the piston compressor comprising a cylinder head, a cylinder head gasket, a valve plate, an intake valve, a valve gasket and a crankcase, wherein the cylinder head comprises a cylinder head high-pressure chamber and a cylinder head discharge hole, the crankcase comprises a crankcase high-pressure chamber and a crankcase discharge hole corresponding to the cylinder head discharge hole, and the piston compressor is provided with a plurality of gas discharge paths for discharging gas that enters the cylinder head high-pressure chamber, the plurality of gas discharge paths comprising: a gas discharge path, along which the gas leaves the cylinder head high-pressure chamber, passes through a gas guide hole in the cylinder head gasket, a gas guide hole in the valve plate, a gas guide hole in the intake valve and a gas guide hole in the valve gasket in sequence to a crankcase channel to enter the crankcase high-pressure chamber, then enters the crankcase discharge hole through a crankcase discharge channel, and is discharged through the cylinder head discharge hole; and at least one further gas discharge path, along which the gas leaves the cylinder head high-pressure chamber and returns to be discharged through the cylinder head discharge hole.