Scroll Compressor Variable-Capacity Mechanism
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Solution Overview
Problem
Conventional capacity-adjustable scroll compressors face challenges with complex variable-capacity structures, asynchronous movement of actuation mechanisms, increased power consumption, leakage, and processing difficulties due to uneven stress and discharge resistance, which affect energy efficiency and reliability.
Innovation Solution
A variable-capacity mechanism for scroll compressors that employs a single actuation device to synchronously control multiple blocking members, reducing the complexity of the structure and improving reliability by using an annular piston and variable-capacity cylinder to define discharge channels, and incorporating a guide hole and sealing device to enhance sealing and reduce radial fit clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sets of variable-capacity actuation mechanisms are added to achieve larger capacity adjustment range, then the capacity adjustment capability is improved, but the structure becomes complex and the blocking members move asynchronously
Solution Approach 1:
The patent merges multiple blocking members into a single integrated structure that is simultaneously actuated by one actuation mechanism. The blocking member includes multiple blocking portions that can block multiple variable-capacity holes at once, eliminating the need for separate actuation mechanisms for each hole and resolving the complexity and asynchrony issues.
Solution Approach 2:
The single blocking member serves multiple functions by incorporating multiple blocking portions that can independently block different variable-capacity holes. This multi-functional design allows one actuation mechanism to control the opening and closing of multiple holes, achieving large capacity adjustment range without increasing structural complexity.
2Adaptability or versatility
If multiple sets of variable-capacity actuation mechanisms are added to achieve larger capacity adjustment range, then the capacity adjustment capability is improved, but the control system becomes complex and reliability is reduced
Solution Approach 1:
By combining multiple blocking functions into a single blocking member actuated by one mechanism, the patent reduces the number of moving parts and control elements. This simplification directly improves reliability by eliminating potential failure points associated with multiple independent actuation mechanisms and their control systems.
3Adaptability or versatility
If multiple pistons are added to achieve larger capacity adjustment range, then the capacity adjustment capability is improved, but the stress on pump body becomes uneven and power consumption increases
Solution Approach 1:
The patent combines the function of multiple pistons into a single blocking member that is actuated by one piston or actuation mechanism. This ensures that the force is applied uniformly to the pump body through the single blocking member, avoiding the uneven stress distribution that occurs with multiple pistons and the associated increase in power consumption.
4Adaptability or versatility
If discharge backflow channel is opened on fixed scroll to achieve capacity adjustment, then the capacity adjustment capability is improved, but the discharge resistance increases and power consumption increases
Solution Approach 1:
The patent segments the discharge backflow function from the fixed scroll and relocates it to the moving scroll. The discharge backflow hole is formed in the moving scroll, allowing the backflow channel to move with the scroll during operation. This segmentation enables capacity adjustment while maintaining smooth discharge flow and reducing resistance, as the moving scroll's rotation naturally facilitates fluid flow through the backflow hole.
Data Source
AI summary
Provided is a variable-capacity mechanism for a scroll compressor. The scroll compressor includes a compression mechanism. The compression mechanism includes a fixed scroll and an orbiting scroll for defining a series of compression cavities. The variable-capacity mechanism includes: a discharge channel, suitable for communicating a medium-pressure compression cavity in the compression cavities with a low-pressure region; blocking members, suitable for selectively opening or closing the discharge channel; an actuation device, including an execution member, the blocking members being connected to the execution member so as to selectively open or close the discharge channel along with the actions of the execution member. Multiple blocking members are connected to a single execution member so as to synchronously move along with the actions of the single execution member. By the variable-capacity mechanism, action synchronization of multiple blocking members can be reliably implemented. Provided is a scroll compressor including the variable-capacity mechanism.