Pressure Equalizer Bellows Spring Motocompressor Differential
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Solution Overview
Problem
Existing systems for maintaining differential pressure between cooling oil and gaseous working fluid in integrated motocompressor machines are inadequate in preventing gas leakage into the cooling oil, especially under conditions of thermal expansion and downstream gas utilization changes.
Innovation Solution
A pressure equalizer system with bellows and a spring mechanism is connected to the motocompressor, ensuring the cooling oil pressure remains slightly higher than the process gas pressure, using separate compartments and connections to maintain a controlled differential pressure, preventing gas leakage into the cooling oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external vessels with bellows and spring means are used to maintain differential pressure, then the can is protected from pressure differences, but the system complexity increases
Solution Approach 1:
The patent combines the pressure equalization function directly into the can structure by integrating bellows and spring means within the can assembly itself, rather than using separate external vessels. This merging approach maintains the differential pressure protection function while reducing system complexity by eliminating external components and their associated connections.
2Shape
If the can is made of thin material layer, then the device size is reduced, but the can becomes sensitive to pressure differences
Solution Approach 1:
The patent employs flexible bellows elements integrated into the can structure that can expand and contract to accommodate pressure variations. These flexible components allow the use of thin-walled cans while maintaining pressure resistance, as the bellows absorb pressure differential stresses through their elastic deformation rather than requiring the thin wall to withstand full pressure loads.
Solution Approach 2:
The spring means are pre-loaded to provide a biasing force that counteracts pressure differences before they can damage the thin-walled can. This beforehand cushioning approach ensures that the thin can material never experiences excessive stress, as the spring continuously applies a compensating force to balance pressure variations.
3Reliability
If cooling oil pressure is increased to prevent gas leakage, then gas leakage is prevented, but thermal expansion effects worsen
Solution Approach 1:
The patent uses a dynamic pressure equalization system where the bellows and spring means automatically adjust the cooling oil pressure in response to thermal expansion and gas pressure changes. Rather than maintaining a fixed high pressure, the system dynamically balances pressures, allowing the cooling oil pressure to increase only when necessary to prevent gas leakage while accommodating thermal expansion through bellows deformation and spring compression.
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
Effectively maintains a desired differential pressure, preventing gas leakage into the cooling oil and ensuring the integrity of the can, even under conditions of thermal expansion and changing gas pressures, thus protecting the electric motor and compressor system.
Implementation Method 1
at least one spring is configured to provide compression on the cooling oil such that the cooling oil pressure is greater than the process gas pressure
Implementation Method 2
a pressure equalizer connected to the motocompressor. The pressure equalizer has chambers created by at least one bellow inside the pressure equalizer
Implementation Method 3
a can surrounding the motor stator provides a leak-proof separation of the working fluid and the cooling oil
Data Source
AI summary
Systems and methods for maintaining a desired differential pressure between a cooling oil of an electric motor and a process gas working fluid of a compressor connected axially to the electric motor. The cooling oil acts as a coolant for the motor compartment of the electric motor and the gas working fluid acts as a coolant for the rotor compartment of the electric motor. At least one bellow is configured to provide two sealed compartments in a pressure equalizer and a spring means is configured to add a differential pressure to the cooling oil, assuring no leaks between the two fluids flows from the cooling oil to the process gas working fluid and no contact of the process gas working fluid with the electric motor stator, in particular electric motor laminations and electric motor windings.