High-Pressure Compressor Bypass Valve for Rapid Restart
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Solution Overview
Problem
High pressure compressors, such as rotary compressors, face difficulties in restarting due to a large pressure difference between suction and discharge pressures, leading to prolonged stop states and reduced efficiency, as they cannot maintain equilibrium pressure for extended periods, and methods to reduce equilibrium time compromise latent heat usage.
Innovation Solution
Incorporating a check valve in the discharge pipe to prevent refrigerant backflow and a solenoid valve to selectively open a bypass pipe between the discharge pipe and the suction side of the accumulator, allowing for extended differential pressure operation and rapid restart by establishing equilibrium pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor stops for a long period to reach equilibrium pressure, then the pressure difference is reduced enabling restart, but the oil level is reduced due to leakage into the accumulator and the stop state is prolonged
Solution Approach 1:
A communication passage is provided between the compression chamber and the accumulator, allowing the compressor to suck refrigerant from the accumulator during stop periods. This intermediary pathway enables pressure equalization without requiring long stop durations, as refrigerant can flow directly between the compression chamber and accumulator through the communication passage, preventing oil leakage while enabling restart.
2Reliability
If the compressor stops for a long period to reach equilibrium pressure, then the pressure difference is reduced enabling restart, but the oil level is reduced due to leakage into the accumulator
Solution Approach 1:
A communication passage is provided between the compression chamber and the accumulator, allowing the compressor to suck refrigerant from the accumulator during stop periods. This intermediary pathway enables pressure equalization without requiring long stop durations, as refrigerant can flow directly between the compression chamber and accumulator through the communication passage, preventing oil leakage while enabling restart.
3Use of energy by moving object
If a method of using latent heat during the differential pressure section is applied, then energy efficiency is maximized, but the compressor cannot be restarted due to prolonged stop requirements
Solution Approach 1:
A communication passage is provided between the compression chamber and the accumulator, allowing the compressor to suck refrigerant from the accumulator during stop periods. This intermediary pathway enables pressure equalization without requiring long stop durations, as refrigerant can flow directly between the compression chamber and accumulator through the communication passage, preventing oil leakage while enabling restart.
4Reliability
If an orifice is provided between the condenser and the evaporator to rapidly reach equilibrium pressure, then restart is enabled, but the use of latent heat during the differential pressure section is disabled
Solution Approach 1:
A communication passage is provided between the compression chamber and the accumulator, allowing the compressor to suck refrigerant from the accumulator during stop periods. This intermediary pathway enables pressure equalization without requiring long stop durations, as refrigerant can flow directly between the compression chamber and accumulator through the communication passage, preventing oil leakage while enabling restart.
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 enables continued differential pressure operation during stops, enhancing energy efficiency and ensuring rapid restart of high pressure compressors, thereby improving reliability and efficiency.
Implementation Method 1
Incorporating a check valve in the discharge pipe to prevent refrigerant backflow
Implementation Method 2
a solenoid valve to selectively open a bypass pipe between the discharge pipe and the suction side of the accumulator
Data Source
AI summary
A high pressure compressor may include a casing in which a refrigerant discharged from a compression device is filled into an inner space provided with a drive motor, a suction pipe directly connected to a suction port of the compression device, a discharge pipe in communication with the inner space of the casing, a first valve provided at the discharge pipe or the suction pipe to control a flow of the discharged refrigerant from a high pressure side to a low pressure side when the drive motor is stopped, a bypass pipe connected between a discharge side and a suction side based on the compression device, and a second valve provided at the bypass pipe to move the refrigerant at the high pressure side to the low pressure side through the bypass pipe, thereby allowing a differential pressure operation to continue when the compressor is stopped.