Refrigeration device for container
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing container refrigeration apparatuses face challenges in efficiently adjusting heating capability, leading to either inadequate heating or excessive energy consumption due to the complexity and limitations of the bypass valve system, which complicates fine temperature control.
Innovation Solution
The apparatus controls the compressor's operating speed and adjusts the refrigerant circulation based on the degree of superheat, using a hot gas bypass circuit to manage refrigerant flow and fan operation, ensuring precise temperature control by varying the refrigerant amount and flow rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two open/close valves are used to adjust heating capability in the bypass circuit, then heating capability can be adjusted in two stages, but the refrigerant circuit becomes more complex and costs increase
Solution Approach 1:
The patent removes the complex two-valve bypass circuit system and extracts only the essential heating function. Instead of using two open/close valves to create two-stage heating adjustment, the invention uses a single bypass circuit with continuous refrigerant flow control, eliminating unnecessary components while preserving the core heating capability.
Solution Approach 2:
Rather than controlling heating capability by opening/closing valves to restrict flow, the invention inverts the approach by using a continuous bypass circuit where refrigerant flows freely and controls heating through compressor operating speed adjustment. This reverses the traditional valve-based discrete control method to a continuous speed-based control system.
2Adaptability or versatility
If two open/close valves are used to control refrigerant flow in bypass pipes, then heating capability can be adjusted, but fine adjustment of heating capability cannot be achieved
Solution Approach 1:
The patent transitions from static discrete valve positions (open/closed states) to dynamic continuous control. By adjusting the compressor's operating speed continuously, the system achieves fine-grained control over refrigerant circulation量和 heating capability, enabling precise temperature control rather than coarse two-stage adjustment.
Solution Approach 2:
The invention changes the control parameter from discrete valve opening states to continuous compressor speed parameter. This allows the heating capability to be adjusted precisely by varying the compressor speed across a continuous range, achieving fine adjustment that was impossible with binary valve states.
3Speed
If compressor operating speed is increased to quickly heat the container, then heating speed improves, but energy consumption increases
Solution Approach 1:
The patent employs periodic or variable compressor operation rather than continuous high-speed operation. The compressor speed is dynamically adjusted based on the heating demand and temperature differential, operating at high speed only when rapid heating is needed and reducing speed as the target temperature approaches, thereby optimizing energy consumption while maintaining heating speed when necessary.
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 allows for quick and appropriate adjustment of heating capability, ensuring the container reaches the target temperature efficiently while preventing refrigerant phase issues that could damage the compressor, thus enhancing the apparatus's reliability and energy efficiency.
Implementation Method 1
the high temperature refrigerant compressed in the compressor (30)
Implementation Method 2
bypasses the condenser (31) and flows into the evaporator (33), thereby heating the inside of the container
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A container refrigeration apparatus includes: a refrigerant circuit (20) which performs a refrigeration cycle, and includes a main circuit (21) sequentially connecting a compressor (30), a condenser (31), a main expansion valve (32) and an evaporator (33), and a hot gas bypass circuit (22) through which a refrigerant compressed in the compressor (30) bypasses the condenser (31) and the main expansion valve (32) to flow into the evaporator (33); and a compressor control section (81) which controls operating speed of rotation of the compressor (30) during heating operation for heating inside of a container by the evaporator (33) while returning the compressed refrigerant from the compressor (30) to the compressor (30) through the hot gas bypass circuit (22) and the evaporator (33) so that a temperature inside the container reaches a target temperature.