Outdoor Unit Leak Detection Layout for Full Machine Chamber Coverage
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Solution Overview
Problem
Existing refrigerant leakage detection systems in outdoor units of heat pump cycle apparatuses fail to accurately detect leaks from sites other than the degassing valve, such as brazed portions of pipes, leading to incomplete detection and potential safety issues.
Innovation Solution
The outdoor unit design includes a refrigerant circuit, a heating medium circuit, a sensor, a gas-liquid separator, a degassing valve, and a fan, with the sensor positioned below the gas-liquid separator to enhance detection accuracy and the machine chamber divided into areas to accommodate the degassing port and sensor, allowing for detection of leaks from various locations, and the system drives the fan to agitate refrigerant upon detection, while ensuring the compressor is explosion-proof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the degassing port is extended with a pipe to the fan chamber, then refrigerant leakage from the degassing valve can be detected, but refrigerant leakage from other sites in the machine chamber cannot be detected
Solution Approach 1:
The sensor placement moves from a one-dimensional pipe extension approach to a three-dimensional positioning within the machine chamber, specifically in the lower space where leaking refrigerant accumulates. This spatial repositioning enables detection of refrigerant leaks from any location within the chamber, not just from the degassing valve.
Solution Approach 2:
The gas-liquid separator acts as an intermediary structure that concentrates and directs leaking refrigerant toward the sensor. By positioning the sensor below the gas-liquid separator, the system uses this intermediate component to channel refrigerant vapors to the detection point, improving detection reliability.
2Device complexity
If the sensor is positioned to detect refrigerant from the degassing valve, then detection is simplified, but detection of refrigerant from other locations fails
Solution Approach 1:
The system uses the natural behavior of refrigerant leakage and gas-liquid separation to direct refrigerant vapors toward the sensor automatically. The gas-liquid separator self-regulates to allow gas phase refrigerant to rise and accumulate in the space above it, where the sensor positioned below can detect it, eliminating the need for complex active pumping or forcing mechanisms.
3Volume of stationary object
If the machine chamber accommodates all components including degassing port and sensor, then compact design is achieved, but detection of refrigerant from brazed portions is missed
Solution Approach 1:
The sensor is positioned at the same gravitational level as the potential accumulation zone for leaking refrigerant within the machine chamber. By placing the sensor in the lower space below the gas-liquid separator, the system creates an equipotential detection zone that captures refrigerant regardless of its entry point, whether from the degassing valve or brazed portions.
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 accurate detection of refrigerant leaks from all relevant areas, including brazed portions, and prevents explosion risks by agitating refrigerant and protecting the ignition source, ensuring reliable operation and safety.
Implementation Method 1
a sensor (70) that detects the refrigerant to find leakage of the refrigerant
Implementation Method 2
a gas-liquid separator (40) that is connected to the heating medium circuit
Implementation Method 3
a degassing valve (54) that is attached to the gas-liquid separator (40) and that degasses the gas-liquid separator (40)
Implementation Method 4
a fan (60) that supplies the first heat exchanger (16) with air
Implementation Method 5
The first heat exchanger (16) causes heat exchange between a refrigerant and air
Implementation Method 6
The second heat exchanger (20) causes heat exchange between the refrigerant and a heating medium
Implementation Method 7
a compressor (12) that compresses a refrigerant
Data Source
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AI summary
It is impossible to detect a refrigerant leaking from a site other than a degassing valve in the machine chamber into a machine chamber. An outdoor unit 90 includes a refrigerant circuit, a water circuit, a refrigerant sensor 70, a gas-liquid separator 40, and a degassing valve 54. The refrigerant circuit connects, by means of a pipe, a compressor 12 and a second heat exchanger 20. The second heat exchanger 20 causes heat exchange between the refrigerant and water. The water circuit has a flow of water that exchanges heat with the refrigerant in the second heat exchanger 20. The refrigerant sensor 70 detects the refrigerant to find refrigerant leakage. The gas-liquid separator 40 is connected to the water circuit. The degassing valve 54 is attached to the gas-liquid separator 40. The degassing valve 54 degasses the gas-liquid separator 40. The machine chamber R2 accommodates the compressor 12 and the second heat exchanger 20. The machine chamber R2 accommodates the degassing port 54a of the degassing valve 54 and the refrigerant sensor 70.