Cooling system and heating system
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Solution Overview
Problem
The refrigerating system with a low back pressure rotary compressor faces challenges in optimizing performance and ensuring motor reliability due to heat exchange between the motor and the sucked gas, which affects both refrigeration and heating cycles.
Innovation Solution
A refrigerating system with a control valve assembly that adjusts gas suction flow between upper and middle gas suction pipes based on mode (refrigerating or heating), minimizing heat transfer from the motor in refrigerating mode and maximizing it in heating mode to maintain motor reliability and improve system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is disposed in the shell with low temperature and low pressure environment, then the motor is cooled and reliability is guaranteed, but the sucked low temperature and low pressure gas is heated and refrigeration performance deteriorates
Solution Approach 1:
The gas suction process is segmented into two separate paths: one path (first gas suction pipe) allows gas to be sucked without passing through the motor to avoid heating, while the other path (second gas suction pipe) allows gas to pass through the motor for cooling. The control valve assembly segments the gas flow to selectively activate each path based on operating mode.
Solution Approach 2:
The system dynamically switches between different gas suction paths based on the operating mode (refrigerating or heating). The control valve assembly adjusts the gas suction flow distribution in real-time, making the system adaptable to different thermal requirements and optimizing performance for each mode.
2Productivity
If the refrigerating system is designed for refrigerating mode to optimize refrigeration performance, then refrigeration efficiency improves, but heating performance may be compromised
Solution Approach 1:
The gas suction system is designed with multi-functionality to serve both refrigerating and heating modes effectively. By providing two gas suction pipes with different paths and a control valve assembly that can direct gas flow differently, the system achieves universal applicability across both operating modes, optimizing performance in each mode without compromising the other.
3Reliability
If the refrigerating system is designed for heating mode to maximize motor cooling, then motor reliability improves, but refrigeration performance deteriorates
Solution Approach 1:
The system dynamically adjusts the gas suction flow distribution based on the operating mode. In heating mode, the control valve assembly directs more gas through the motor cooling path, while in refrigerating mode, it redirects gas away from the motor path. This dynamic adaptation ensures optimal motor cooling when needed without sacrificing refrigeration efficiency during cooling operations.
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 solution enhances the refrigeration cycle's cooling quality and heating quality by optimizing gas suction flow, reducing performance deterioration and ensuring motor reliability across different operating conditions.
Implementation Method 1
the sucked low temperature and low pressure gas exchanges heat with the motor, which cools the motor and hence guarantees the reliability of the motor on one hand, but deteriorates the performance of the refrigeration cycle since the sucked gas is heated on the other hand
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
A refrigerating system (100) and a heating system (200) are provided. The refrigerating system (100) includes a low back pressure rotary compressor (1), a four-way valve (2), an outdoor heat exchanger (3), an indoor heat exchanger (4), a throttling element (4) and a control valve assembly (6). A shell of the low back pressure rotary compressor (1) is formed with an upper gas suction pipe (S1), a middle gas suction pipe (S2) and an exhaust pipe (D). The control valve assembly (6) is connected with a gas suction valve port (21), the upper gas suction pipe (S1) and the middle gas suction pipe (S2) via a first pipeline (G), a second pipeline (F) and a third pipeline (E) respectively. When the refrigerating system is in a refrigerating mode, the control valve assembly (6) controls a gas suction flow of the third pipeline (E) to be larger than that of the second pipeline (F); when the refrigerating system is in a heating mode, the control valve assembly (6) controls the gas suction flow of the second pipeline (F) to be larger than that of the third pipeline (E).