Refrigerant Charging Valve Control for Stable Low-Temperature Flow
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Solution Overview
Problem
Conventional refrigerant charging devices experience variations in charging speed due to pressure differences, leading to longer charging times, especially at lower outdoor air temperatures.
Innovation Solution
A refrigerant charging device with a supply pipe connected to the suction side of a compression mechanism, featuring an adjustment mechanism that controls the flow rate within a predetermined range based on the pressure difference between the refrigerant supplied and the suction side pressure, using an electric valve and flow rate control unit to maintain consistent refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If refrigerant charging relies on pressure difference between cylinder and suction side, then charging device structure is simple, but charging speed varies and charging time increases
Solution Approach 1:
The patent applies the dynamics principle by making the flow rate adjustable through a flow rate adjustment mechanism. The flow rate is dynamically adjusted based on the pressure difference between the cylinder and suction side, allowing the system to adapt to varying pressure conditions and maintain consistent charging speed despite changes in outdoor air temperature or pressure differential.
2Device complexity
If refrigerant charging relies on pressure difference, then no additional control mechanism is needed, but charging time becomes unpredictable and longer
Solution Approach 1:
The patent implements feedback control by using a pressure difference detection mechanism to monitor the pressure differential between the cylinder and suction side. Based on this detected pressure difference, the flow rate adjustment mechanism automatically adjusts the refrigerant flow rate to maintain consistent charging speed, thereby reducing charging time and making it predictable.
3Ease of operation
If flow rate is not adjusted, then device operation is simple, but charging speed decreases when cylinder pressure drops
Solution Approach 1:
The patent applies self-service principle by implementing an automatic flow rate adjustment mechanism that autonomously responds to pressure difference changes. The system automatically detects pressure differential variations and adjusts the flow rate accordingly without requiring manual intervention, thereby maintaining consistent charging speed while keeping the operation simple through automation.
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 solution stabilizes the refrigerant charging speed, reducing the impact of pressure drops and preventing prolonged charging times, while ensuring the refrigerant is charged efficiently and effectively.
Implementation Method 1
a flow rate in the supply pipe is adjusted on the basis of a pressure difference between a pressure of refrigerant supplied to the supply pipe and a refrigerant pressure on the suction side of the compression mechanism
Data Source
AI summary
An electric valve is provided in a supply pipe. A flow rate control unit controls the degree of opening of the electric valve such that the flow rate in the supply pipe lies within a predetermined range, on the basis of a pressure difference between pressure of refrigerant supplied to the supply pipe and the pressure of refrigerant on the suction side of a compressor. An outdoor air temperature sensor detects outdoor air temperature; and a low-pressure side pressure sensor detects refrigerant pressure on the suction side of the compressor. The pressure difference is a difference between a saturation pressure corresponding to the outdoor air temperature detected by the outdoor air temperature sensor and refrigerant pressure detected by the low-pressure side pressure sensor.