Asymmetrical Vane Grooves for Rotary Compressor Load Reduction
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Solution Overview
Problem
In combined rotary compressors, the misalignment of the central axis of the roller and vane leads to increased load on the vane, causing durability issues and dead volume, which results in reduced cooling capability due to remaining refrigerants being suctioned back into the compression chamber.
Innovation Solution
The design includes a vane slot with asymmetrical discharge and suction-sided grooves, where the central axis of the vane slot is inclined towards the suction space, reducing the load on the vane and minimizing dead volume by aligning the central point of the coupling groove and compression chamber axis, thereby optimizing the vane's shape to reduce the volume at the discharge space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the central axis of the vane hinge is spaced apart from the central axis of the vane towards the discharge portion, then dead volume is reduced and cooling capability is improved, but the load on the vane increases and durability deteriorates
Solution Approach 1:
The vane is designed with asymmetrical contraction portions where the volume of the contraction portion near the discharge portion is smaller than that near the suction portion. This asymmetrical geometry optimizes the balance between reducing dead volume and minimizing load on the vane, resolving the contradiction between cooling capability and durability.
2Volume of stationary object
If the central axis of the vane hinge is spaced apart from the central axis of the vane, then dead volume is reduced, but the rotational force load on the vane increases causing damage to contraction portions
Solution Approach 1:
The vane features contraction portions with different volumes at different locations - a first contraction portion near the suction portion with larger volume and a second contraction portion near the discharge portion with smaller volume. This local variation in geometry distributes mechanical loads more effectively while minimizing dead volume, protecting the contraction portions from damage.
3Productivity
If the vane and roller are coupled to reduce dead volume, then compression efficiency is improved, but the misalignment causes increased load and durability issues
Solution Approach 1:
The coupled vane-roller system employs asymmetrical contraction portions with different volumes optimized for their respective positions. This asymmetrical design allows the vane to effectively reduce dead volume while the specific geometry of the contraction portions minimizes the load on the vane, maintaining durability alongside improved compression efficiency.
Data Source
AI summary
A rotary compressor includes a cylinder having a vane slot and a compression chamber, a shaft having an eccentric portion and configured to perpendicularly pass through a center of the compression chamber, a roller having a coupling groove and configured to orbit in the compression chamber by rotation of the shaft, and a vane having a vane hinge coupled to the coupling groove and a vane body being inserted into the vane slot and configured to divide the compression chamber into a discharge space and a suction space. A shape of the discharge-sided groove close to the discharge space and a shape of the suction-sided groove close to the suction space are asymmetrically formed between the vane hinge and the vane body with respect to the a central axis of the vane.