Refrigeration system and control method for starting refrigeration system
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Solution Overview
Problem
Refrigeration systems face high starting loads due to increasing suction and exhaust pressures with ambient temperature, leading to potential start failures and excessive lubricating oil carryover, especially in environments with large temperature differences.
Innovation Solution
Incorporating a first valve between the throttle element and condenser, and a second valve near the compressor's suction port, to isolate the suction and exhaust sides from other components during shutdown, creating a closed space with only vapor-phase refrigerant, thereby reducing the starting load and preventing oil carryover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine size is increased to handle high starting load, then the reliability of starting is improved, but the weight and cost of the system increase
Solution Approach 1:
The patent applies preliminary action by closing valves before compressor startup to isolate the compression chamber and prevent refrigerant from entering. This preparatory step reduces the starting load on the engine before the compressor actually starts, allowing a smaller engine to reliably start the system.
Solution Approach 2:
The patent applies preliminary anti-action by using valves to preemptively block the refrigerant flow path to the compressor before startup. This prevents the harmful effect of high suction pressure and refrigerant ingress that would otherwise require a larger engine to overcome.
2Power
If the engine size is increased to handle high starting load, then the starting load capacity is improved, but the device complexity increases
Solution Approach 1:
The system performs preliminary action by closing isolation valves before compressor startup. This preparatory measure reduces the starting load capacity requirement by preventing refrigerant from entering the compression chamber, avoiding the need for a larger engine while maintaining system simplicity.
3Temperature
If the system operates in high ambient temperature, then the cooling effect is improved, but the starting load increases
Solution Approach 1:
The patent applies preliminary anti-action by closing valves to block refrigerant flow paths before compressor startup in high ambient temperatures. This prevents high suction pressure caused by thermal expansion of refrigerant, thereby reducing starting load while maintaining the system's ability to provide cooling effect.
Solution Approach 2:
The system performs preliminary action by isolating the compression chamber with valves before startup. This preparatory step prevents hot refrigerant from entering the compressor, reducing the power required for starting while preserving the cooling function.
4Productivity
If the compressor runs at high suction pressure, then the refrigeration capacity is improved, but the lubricating oil carryover increases
Solution Approach 1:
The patent applies preliminary action by closing the suction valve before compressor startup. This prevents high suction pressure from developing during startup, thereby preventing lubricating oil from being carried out with the refrigerant while allowing the system to achieve high refrigeration capacity during normal operation.
Data Source
AI summary
A refrigeration system and a start control method for a refrigeration system. The refrigeration system includes: a refrigeration loop having an exhaust port of a compressor, a condenser, a throttle element, an evaporator, and a suction port of the compressor connected in sequence by using a flow path; wherein a first valve is disposed between the throttle element and the condenser, and the first valve is at least capable of cutting off a refrigerant flow from the throttle element to the condenser; and a second valve is disposed close to the suction port of the compressor, and the second valve is used to control on/off of a flow path between the evaporator and the compressor. Starting load of the refrigeration system according to the present invention can be effectively reduced, so that the power and size of a drive component for providing power can also be reduced.