Reciprocating Piston Compressor Lubricant Suction for Oil Buildup
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Solution Overview
Problem
Reciprocating piston compressors in refrigerant circuits often accumulate excessive lubricant, leading to insufficient lubrication in other components, as the provided lubricant amount is inadequate or excessive.
Innovation Solution
A lubricant suction conduit is introduced with an inlet opening in the collecting chamber and an outlet opening in the suction gas duct, creating a pressure gradient to draw lubricant out and distribute it through the compressor and refrigerant circuit, ensuring sufficient lubrication while preventing excessive accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger amount of lubricant is provided in the collecting chamber, then the reciprocating piston compressor has sufficient lubrication, but other components of the refrigerant circuit do not have enough lubricant available
Solution Approach 1:
The patent extracts excess lubricant from the collecting chamber by introducing a suction conduit that draws lubricant out when pressure in the suction gas duct drops below collecting chamber pressure. This prevents over-accumulation in the compressor while maintaining adequate total lubricant quantity in the refrigerant circuit.
Solution Approach 2:
The patent changes the pressure parameter in the suction gas duct (by creating pressure drops during suction strokes) to control lubricant movement. When pressure drops below collecting chamber pressure, lubricant is drawn out; when pressure rises, lubricant flow stops. This dynamic pressure control regulates lubricant distribution.
2Reliability
If the amount of lubricant in the collecting chamber is increased, then the compressor is well-lubricated, but the total lubricant required for the refrigerant circuit becomes greater than provided for
Solution Approach 1:
The suction conduit enables the system to self-regulate lubricant distribution. When pressure conditions are right, lubricant automatically flows from the collecting chamber to the suction gas duct and onward to other refrigerant circuit components, eliminating the need for external lubricant management systems.
3Quantity of substance
If a lubricant suction conduit is added to remove excess lubricant, then lubricant accumulation is controlled, but the device complexity increases
Solution Approach 1:
The suction conduit serves multiple functions: it acts as a lubricant removal pathway, a pressure equalization channel, and a potential lubricant return route. This multi-functionality justifies the added component by providing several benefits from a single structural addition.
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 configuration effectively manages lubricant levels, preventing excessive accumulation in the compressor and ensuring adequate lubrication throughout the refrigerant circuit, thereby maintaining efficient operation with reduced lubricant requirements.
Implementation Method 1
the outlet opening is located in an area of the suction gas duct, in which a static pressure, which is lower than a static pressure in the collecting chamber for lubricant, prevails at least temporarily
Implementation Method 2
draw lubricant out of the collecting chamber by suction and supply it to the suction gas
Data Source
AI summary
In order to improve a reciprocating piston compressor for a refrigerant circuit, comprising a crankcase, in which a collecting chamber for lubricant is arranged, a cylinder housing, in which at least one reciprocating piston is movable in an oscillating manner, a valve plate which closes the cylinder housing and in which at least one inlet valve and one outlet valve are arranged, and a cylinder head, in which a suction gas duct which runs to the inlet valve and a compressed gas duct which leads away from the outlet valve are provided, in such a manner that excessive accumulations of lubricant can be avoided, it is suggested that a lubricant suction conduit be provided which has an inlet opening associated with the collecting chamber and an outlet opening associated with the suction gas duct and that the outlet opening be located in an area of the suction gas duct, in which a static pressure, which is lower than a static pressure in the collecting chamber for lubricant, prevails at least temporarily.