Ice-Making Machine Ventilation Control for Refrigerant Leak Safety
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Solution Overview
Problem
Conventional ice-making machines using combustible gases as refrigerants face safety and reliability issues when leaks occur, as the leaking refrigerant can ignite and cause fires in electrical or hot parts within the machine.
Innovation Solution
A method is implemented where the cooling fan of the condenser is continuously operated to discharge leaking refrigerant outside the machine, preventing it from accumulating and reducing the risk of fires, even if the refrigerant detection sensor fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling fan is continuously operated to discharge leaking refrigerant, then safety is improved by preventing refrigerant accumulation, but energy consumption increases due to continuous operation
Solution Approach 1:
The control unit continuously operates the cooling fan in advance before refrigerant leakage is detected, establishing a preventive safety mechanism. This preliminary action ensures that any leaked refrigerant is immediately discharged, preventing accumulation and potential ignition, while the continuous operation is justified by the high safety stakes involved with combustible refrigerants
2Reliability
If the ice-making machine stops operation when refrigerant leakage is detected, then safety is improved by preventing fire hazards, but productivity decreases due to operation interruption
Solution Approach 1:
The harmful element (refrigerant leakage) is extracted and discharged from the system through continuous cooling fan operation. By separating the safety function (refrigerant discharge) from the production function (ice-making operation), the system can maintain productivity while independently addressing safety concerns through continuous refrigerant venting
Solution Approach 2:
The potentially harmful refrigerant leakage is converted into a manageable situation by using the cooling fan to actively discharge the leaked refrigerant. The harm (refrigerant accumulation risk) is transformed into a controlled process where leakage is continuously removed, allowing the machine to maintain operation without fire hazard
3Measurement precision
If refrigerant detection sensor is used to detect leakage, then measurement precision is improved for safety monitoring, but device complexity increases due to additional detection system
Solution Approach 1:
The cooling fan serves multiple functions: it cools the condenser during normal operation and discharges leaked refrigerant during safety incidents. By making this existing component multi-functional, the system achieves enhanced detection and response capabilities without adding dedicated new hardware, thus improving measurement precision while minimizing increased device complexity
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 enhances the safety and reliability of the ice-making machine by ensuring that refrigerant leaks are diffused and discharged, preventing hazardous concentrations from forming and reducing the risk of fires, while also allowing continuous operation during sensor failures.
Implementation Method 1
a cooling fan 34 forcedly air-cooled by a cooling fan 34
Implementation Method 2
the refrigerant is gasified by the evaporator 33, and the evaporator 33 is cooled by vaporization heat
Implementation Method 3
the refrigerant is turned to a high-pressure gas by the compressor 30
Implementation Method 4
the refrigerant is cooled and turned to a high-pressure liquid by the condenser 31
Data Source
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Figure 3
AI summary
Safety and reliability are enhanced when the leakage of a refrigerant occurs, and ice-making efficiency is prevented from being lowered when a failure occurs in refrigerant detecting means. A refrigerant detection sensor S that can detect a refrigerant leaking from a refrigerating mechanism E transmits a detection signal to controlling means C when the refrigerant has been detected, and transmits a failure signal to the controlling means C when a failure has occurred in the refrigerant detection sensor itself. The controlling means C controls a cooling fan 34, which forcedly air-cools a condenser 31, to continuously operate and also controls an ice-making mechanism D to stop an ice-making operation and a deicing operation upon receiving the detection signal from the refrigerant detection sensor S. Further, the controlling means C controls the cooling fan 34 to continuously operate and also controls the ice-making mechanism D to continue the ice-making operation and the deicing operation upon receiving the failure signal from the refrigerant detection sensor S.