Pressure control device
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Solution Overview
Problem
HVAC systems face challenges in controlling refrigerant pressure, as existing solutions lack effective backup mechanisms to prevent damage from high or low pressure levels, and current pressure control devices may fail, leading to equipment damage without a reliable safety system.
Innovation Solution
A pressure control device combining a mechanical pressure switch and an electronic pressure sensor to monitor and control refrigerant pressure, using both digital and mechanical means to prevent pressure from exceeding safe limits, with built-in redundancy to ensure continuous operation even if one component fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only an electronic pressure sensor is used to control the compressor, then the control precision is improved, but the reliability deteriorates because the electronic system may fail without a mechanical backup
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a mechanical pressure switch as a pre-established backup system. This mechanical switch is configured to activate before catastrophic failure can occur, providing a safety net that cuts power to the compressor when electronic systems fail or when dangerous pressure levels are reached, thereby preventing equipment damage
Solution Approach 2:
The patent uses an intermediary approach by introducing a mechanical pressure switch that acts as a mediator between the electronic control system and the power supply. This mechanical component independently monitors pressure and can interrupt power flow without relying on the electronic system, providing a layered defense against system failure
2Reliability
If a mechanical pressure switch is added as a backup to the electronic sensor, then the reliability is improved, but the device complexity increases due to additional components and control logic
Solution Approach 1:
The patent applies segmentation by dividing the pressure control function into two independent segments: an electronic pressure sensor for normal operational control and a mechanical pressure switch for safety backup. This segmentation allows each component to perform its specific function independently, simplifying the overall system architecture while maintaining high reliability through functional separation
3Ease of operation
If the electronic control system is used alone, then the ease of operation is improved, but the safety deteriorates because there is no backup mechanism to prevent equipment damage from pressure failures
Solution Approach 1:
The patent implements preliminary anti-action by configuring the mechanical pressure switch to automatically counteract harmful high-pressure conditions before they can cause equipment damage. The mechanical switch is set to activate at predetermined pressure thresholds, providing preliminary protection that prevents the harmful effects of uncontrolled pressure buildup
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 solution effectively maintains safe refrigerant pressure levels, preventing equipment damage and meeting safety standards like the Pressure Equipment Directive (PED) EN 12263, by using a mechanical switch as a backup to the electronic sensor, ensuring continuous operation and reliability.
Implementation Method 1
A pressure sensor may be used to detect the pressure of the pressure line
Implementation Method 2
A mechanical pressure switch may be used to actuate in response to a pressure of the pressure line
Data Source
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AI summary
A pressure control device for controlling a compressor includes a pressure sensor configured to measure pressure of a pressure line and a processing circuit. The processing circuit is configured to receive the measured pressure of the pressure line from the pressure sensor and control the compressor based on a set-point and the measured pressure. The pressure control device includes a mechanical switch sensitive to the pressure of the pressure line and configured to move between an open position and a closed position responsive to the pressure of the pressure line. Movement of the mechanical switch into one of the open position or the closed position causes the compressor to turn off and overrides the control of the compressor by the processing circuit.