Refrigeration cycle device
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Solution Overview
Problem
Accurately detecting abnormalities in electronic expansion valves and solenoid valves within a multifunctional refrigeration cycle apparatus capable of cooling and heating mixed operations is challenging due to the complexity of the system.
Innovation Solution
The refrigeration cycle apparatus employs a configuration where the compressor operates with the indoor heat exchanger as a condenser, with specific valve positions to utilize temperature sensors for abnormality detection by comparing measured temperatures against predetermined thresholds, allowing for precise identification of valve issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple valves (electronic expansion valve and two solenoid valves) are provided for each indoor heat exchanger to enable multifunctional operation, then the adaptability and versatility of the refrigeration cycle apparatus is improved, but the device complexity increases and abnormality detection becomes more difficult
Solution Approach 1:
The patent segments the abnormality detection process into distinct operational modes (heating mode and cooling mode) with specific detection sequences. In heating mode, the electronic expansion valve is detected first, then the solenoid valves; in cooling mode, the detection sequence is reversed. This segmented approach simplifies the complex detection task by breaking it down into manageable stages based on operational context.
Solution Approach 2:
The patent performs preliminary actions by setting specific valve states before detection. Before detecting the electronic expansion valve, the solenoid valves are set to predetermined positions. Before detecting solenoid valves, the electronic expansion valve is positioned appropriately. This preliminary configuration ensures that temperature differences observed during detection are solely due to the valve being tested, not other valves in the system.
2Adaptability or versatility
If multiple valves are provided for each indoor heat exchanger, then the adaptability is improved, but the measurement precision of abnormality detection deteriorates due to interference from multiple components
Solution Approach 1:
The patent extracts the detection of each valve's abnormality into separate, independent detection processes. By isolating the detection of the electronic expansion valve from the solenoid valves (and vice versa) through specific operational modes and sequences, the system eliminates interference between components. This allows each valve's temperature characteristics to be measured independently, improving detection precision.
Solution Approach 2:
The patent employs dynamic detection strategies where the detection sequence and valve states change based on the operational mode. In heating mode, the system detects the electronic expansion valve first with solenoid valves in specific positions, then detects solenoid valves with the electronic expansion valve positioned differently. This dynamic adaptation ensures optimal detection conditions for each valve type.
3Ease of operation
If conventional abnormality detection methods are used in complex valve configurations, then the ease of operation is maintained, but the reliability of abnormality detection deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where temperature sensor readings are continuously monitored and compared against expected values. When temperature differences exceed predetermined thresholds, the system identifies abnormalities and can trigger alerts or corrective actions. This feedback loop ensures reliable detection while maintaining automated operation, reducing the need for manual intervention.
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 approach enables more accurate and timely detection of abnormalities in the valves, facilitating earlier intervention and reducing the duration of poor system performance.
Implementation Method 1
a third temperature sensor configured to measure a temperature of refrigerant at a gas portion of the indoor heat exchanger
Implementation Method 2
a second temperature sensor configured to measure a temperature of refrigerant at a liquid portion of the indoor heat exchanger
Implementation Method 3
a first temperature sensor configured to measure a temperature in the room
Implementation Method 4
a saturation temperature obtained by converting a condensing pressure of the refrigerant
Data Source
Figure 1
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Figure 4~5
AI summary
A refrigeration cycle apparatus includes a refrigeration cycle circuit, a first junction portion, a second junction portion, a bypass pipe connecting the first junction portion and the second junction portion, a first valve provided between the second junction portion and a refrigerant flow switching device, a second valve provided to the bypass pipe, a first temperature sensor configured to measure a temperature in a room, a second temperature sensor configured to measure a temperature of refrigerant at a liquid portion of an indoor heat exchanger, and a third temperature sensor configured to measure a temperature of refrigerant at a gas portion of the indoor heat exchanger. In an operation status in which a compressor operates, the indoor heat exchanger operates as a condenser, the first valve is closed, and the second valve is opened, when a temperature obtained by subtracting a temperature measured by the third temperature sensor from a saturation temperature obtained by converting a condensing pressure of the refrigerant is larger than a first threshold temperature, or when a temperature obtained by subtracting a temperature measured by the first temperature sensor from a temperature measured by the second temperature sensor is smaller than a second threshold temperature, the refrigeration cycle apparatus is configured to detect an abnormality at at least one of an expansion valve and the second valve.