Scroll Compressor Pressure Relief Structure for Low-Torque Restart
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Solution Overview
Problem
Scroll compressors experience difficulty in starting due to high starting torque requirements when the compressor is shut down, leading to abnormal sounds and abrasion from high-speed rotation, and this affects normal operation.
Innovation Solution
A scroll compressor design with a partition plate, movable and stationary scroll plates, and a pressure relief low-speed rotation structure that balances pressure differences between the discharge and suction spaces, using a pressure relief low-speed rotation plate to manage the passage area for refrigerant flow, reducing high-speed rotation and preventing abrasion and abnormal sounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is disposed on the stationary scroll plate to prevent refrigerant backflow, then the scroll plate is protected from abrasion and abnormal sounds, but a relatively large starting torque is required when the compressor is restarted
Solution Approach 1:
A pressure relief low-speed rotation structure is introduced as an intermediary component between the check valve function and the scroll plate rotation. This structure includes a pressure relief low-speed rotation plate with through holes that mediates the pressure balance, allowing the check valve to prevent backflow while providing a pressure relief path that reduces starting torque requirements
Solution Approach 2:
The pressure relief function is segmented from the check valve by introducing a separate pressure relief low-speed rotation structure. This segmentation allows the check valve to focus on backflow prevention while the pressure relief structure handles pressure balancing, resolving the contradiction between protection and starting torque
2Reliability
If the check valve completely isolates the intermediate pressure chamber and discharge space, then refrigerant backflow is prevented, but the starting performance of the compressor is affected
Solution Approach 1:
The pressure relief low-speed rotation structure serves as an intermediary that connects the isolated discharge space to the intermediate pressure chamber through controlled pressure relief paths. This allows complete isolation for backflow prevention during operation while providing pressure equalization paths during startup
Solution Approach 2:
The pressure relief structure provides preliminary pressure equalization action before the compressor starts. By allowing pressure to equalize through the pressure relief paths before startup, the system prepares for easier starting while maintaining complete isolation during normal operation
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
The design improves start-up performance by reducing resistance to refrigerant discharge and ensuring normal operation, preventing abrasion and abnormal sounds, and maintaining pressure balance during shut-down and start-up cycles.
Implementation Method 1
as the refrigerant in the discharge space is a compressed refrigerant, the pressure in the discharge space is generally greater than that between the movable scroll plate and the stationary scroll plate, and then the remaining refrigerant of the pressure in the discharge space can return to the place between the movable scroll plate and the stationary scroll plate through the second through hole under the action of the pressure
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A scroll compressor (100), comprising a housing (110); a partition plate (120), which is provided in the interior of the housing and which divides the interior of the housing into a suction space (210) and a discharge space (220), the partition plate being provided with a first through hole (122) to communicate the suction space with the discharge space; a rack (130), which is located in the suction space in the interior of the housing, the rack and the partition plate being spaced apart; a movable scroll plate (142), which is movably provided on the rack; a stationary scroll plate (144), which is provided on the rack and which cooperates with the movable scroll plate, the stationary scroll plate being provided with a second through hole (1442), and the second through hole communicating with the discharge space; and a pressure relief low-speed rotation structure (150), which is provided on the stationary scroll plate, the pressure relief low-speed rotation structure being configured to be capable of communicating the second through hole with the discharge space. When the scroll compressor is shut down, the movable scroll plate rotates at a low speed to balance the pressure difference between an intermediate pressure chamber (260) and the discharge space, preventing the movable scroll plate from rotating at a high speed and generating abrasion and abnormal sounds, and a refrigerant can be successfully discharged into the discharge space when restarting again, improving the start-up performance of the scroll compressor.