Refrigerant Compressor Check Valve Stabilized by Venturi Suction
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Solution Overview
Problem
Existing check valves for refrigerant compressors experience unstable valve element positions due to varying flow rates, leading to vibrations, pressure pulsations, and potential valve destruction.
Innovation Solution
The check valve incorporates a flow accelerating passage to create a region of reduced refrigerant pressure, which is captured by a connection channel and transferred to the stop surface of the stroke limiter, maintaining the valve element in its opening position until backflow occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional check valve design is used, then the valve structure is simple, but the valve element position becomes unstable due to varying flow rates causing rattle and vibrations
Solution Approach 1:
The outlet passage is divided into a flow accelerating passage and a pressure equalization passage, separating the functions of flow acceleration and pressure management to stabilize the valve element position
Solution Approach 2:
A pressure equalization passage is introduced as an intermediary channel to transfer pressure from the flow accelerating passage to the valve element, mediating the force balance to maintain stable positioning
2Reliability
If the valve element is allowed to move freely with varying flow rates, then the valve responds dynamically to flow changes, but pressure pulsations and vibrations occur due to rattle
Solution Approach 1:
The pressure equalization passage provides a counterbalancing pressure force that opposes the fluctuating flow forces, canceling out the harmful vibrations and pressure pulsations
Solution Approach 2:
The system changes the pressure parameter distribution by creating a flow accelerating passage that generates a pressure gradient, using this pressure difference to maintain stable valve element positioning
3Manufacturing precision
If the check valve is designed for high pressure ratios and low mass flow, then shut-off efficiency is improved, but valve retention during operation becomes problematic
Solution Approach 1:
The valve design implements different local qualities by creating distinct flow passages with different functions: the flow accelerating passage for high velocity flow and the pressure equalization passage for stable pressure retention, optimizing performance for both shut-off efficiency and operational stability
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 stabilizes the valve element in its opening position, reducing vibrations and pressure pulsations, and prevents valve destruction by ensuring efficient closure during shut-off, especially under conditions of high pressure ratios and low mass flow.
Implementation Method 1
the outlet passage of the check valve is provided with at least one flow accelerating passage, in which, by using the Venturi Effect, a flow region of reduced refrigerant pressure with respect to the refrigerant pressure within the valve chamber appears
Data Source
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AI summary
Check valve for a refrigerant compressor comprising a valve housing (30), a valve chamber (56) arranged within the valve housing, a valve element (72) arranged in the valve chamber and being moveable in said valve chamber between a bottom section (34) and a stroke limiter (54), the valve element (72) in a closing position prevents a flow of refrigerant out of said valve chamber through a bottom opening (36) and in an opening position the valve element is abutting on a stop surface of said stroke limiter (54), wherein in the opening position of the valve element a flow of refrigerant leaves the valve chamber (56) through at least one outlet passage (94,114) which comprises at least one flow accelerating passage (92) and therein provides a flow region of reduced refrigerant pressure with respect to the refrigerant pressure within the valve chamber and wherein at least one connection channel (102) extending in said stroke limiter (54) comprises an opening arranged close to the flow region of reduced refrigerant pressure for capturing the reduced refrigerant pressure and for transferring said reduced refrigerant pressure to an opening arranged in an area of the stop surface of the stroke limiter (54) on order to support retaining of the valve element in its opening position.