Compressor Temperature Control via Coolant Mixing Valve
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Solution Overview
Problem
Variable-speed compressors experience unstable operation due to varying outlet temperatures, which existing temperature control systems fail to manage efficiently, leading to inefficient cooling and lubrication.
Innovation Solution
A compressor system utilizing a mechanical temperature sensor with a movable valve to adjust coolant flow ratios based on the compressor discharge temperature, ensuring stable temperature control through a combination of cooled and un-cooled coolant mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable-speed compressor is used to improve productivity and adaptability, then the compressor can operate at different speeds to meet varying demands, but the outlet temperature varies greatly causing unstable operation
Solution Approach 1:
The patent employs a temperature sensor that detects the outlet temperature of the compressor and feeds this information back to a control valve. The valve adjusts the coolant flow rate based on the temperature feedback, creating a closed-loop control system that stabilizes the outlet temperature despite variable operating speeds. This feedback mechanism directly addresses the instability caused by variable-speed operation.
Solution Approach 2:
The control valve dynamically changes the coolant flow rate parameter in response to temperature variations. By adjusting the amount of coolant introduced into the compression chamber, the system modifies the thermal parameters to maintain stable outlet temperature. This parameter adjustment allows the system to compensate for temperature fluctuations caused by variable-speed operation.
2Temperature
If existing temperature control systems are used with variable-speed compressors, then temperature control is attempted, but the systems fail to manage efficiently leading to unstable operation
Solution Approach 1:
The temperature control system is designed to be self-regulating through the direct coupling of the temperature sensor and control valve. The sensor automatically detects temperature deviations and the valve autonomously adjusts coolant flow without requiring external intervention or complex control algorithms. This self-service capability enhances reliability by eliminating dependencies on external control systems.
Solution Approach 2:
The patent replaces complex electrical or electronic temperature control systems with a simpler mechanical sensing and control mechanism. The temperature sensor appears to be a mechanical expansion-based sensor that directly actuates the control valve through mechanical means, eliminating the need for electronic sensors, controllers, and actuators. This mechanical substitution improves reliability by reducing the number of failure-prone electronic components.
3Temperature
If coolant flow is increased to cool the compressor, then temperature control is improved, but compression efficiency decreases due to excessive coolant introduction
Solution Approach 1:
The control valve dynamically adjusts the coolant flow rate based on real-time temperature conditions and compressor operating speed. Rather than using a fixed coolant flow rate, the system continuously adapts the coolant amount to match the actual cooling需求, ensuring optimal cooling efficiency without excessive coolant introduction that would reduce compression performance. This dynamic adjustment maintains the balance between cooling effectiveness and compression efficiency.
Solution Approach 2:
The system applies partial cooling action by introducing only the necessary amount of coolant required to maintain stable outlet temperature, rather than using excessive coolant flow. The control valve modulates the coolant flow to provide just enough cooling to compensate for heat generation at variable speeds, avoiding the efficiency penalties associated with over-cooling while still achieving effective temperature control.
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 system provides reliable and efficient temperature control, maintaining compressor efficiency by dynamically adjusting coolant temperatures in response to varying discharge temperatures, thereby stabilizing compressor operation.
Implementation Method 1
the sensor including a mechanical element that expands and contracts in response to changes in the temperature of the flow of compressed fluid
Data Source
Figure 1
Figure 2~3
AI summary
A compressor (10) discharges a flow of compressed fluid at a predetermined temperature. The compressor includes a sensor (45) positioned to measure a first temperature indicative of the temperature of the compressed fluid, a coolant source (15), a cooler (30) positioned to receive a first flow of coolant from the coolant source and discharge a flow of cooled coolant, and a valve (40) positioned to receive the flow of cooled coolant and a second flow of coolant from the coolant source (15). The valve (40) is configured to discharge a coolant flow to the compressor (10) and the coolant flow has a ratio of cooled coolant to second flow of coolant that is variable in response to the first temperature.