Scroll Compressor Suction Check Valve Design to Reduce Pressure Loss
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Solution Overview
Problem
Suction pressure loss occurs in scroll compressors due to a reduction in passage area caused by cylindrical wall portions of the valve body and support, leading to inefficiencies.
Innovation Solution
The design allows one circumferential wall of the valve body or valve seat to have a smaller outside diameter than the other, enabling it to be housed inside, thereby increasing the passage area and reducing suction pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cylindrical wall portions of the valve body and support are made to have substantially the same size, then structural stability is improved, but suction passage area is reduced causing suction pressure loss
Solution Approach 1:
The patent applies nesting by making one circumferential wall (either the first circumferential wall of the valve body or the second circumferential wall of the valve seat) have a smaller outside diameter than the inside diameter of the other circumferential wall. This allows one circumferential wall to be housed inside the other, creating a nested configuration that increases the suction passage area while maintaining structural stability through the interlocked design.
2Loss of energy
If the passage area of suction passage is increased, then suction pressure loss is reduced, but structural support is weakened
Solution Approach 1:
The nested configuration of circumferential walls increases the suction passage area, allowing greater refrigerant flow and reduced suction pressure loss while the interlocking nature of the nested walls provides structural support.
Solution Approach 2:
The patent employs asymmetry by making one circumferential wall have a smaller outside diameter than the inside diameter of the other circumferential wall. This asymmetric design allows the walls to nest within each other, optimizing both the passage area for reduced pressure loss and providing structural support through the asymmetric interlocking configuration.
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 configuration reduces suction pressure loss and improves the volume efficiency of the compressor, particularly when using intermediate/low pressure refrigerants like R513A or R1234yf.
Implementation Method 1
a compression spring arranged between the valve body and the valve seat and configured to bias the valve body toward the open end of the suction pipe
Implementation Method 2
if the force exerted on the valve body by a suction refrigerant is greater than the biasing force of the coil spring, the coil spring contracts, and the valve body thus moves away from an open end face
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A suction check valve (80) includes a valve body (81), a valve seat (85), and a compression spring (88). The valve body (81) includes a first bottom portion (82), and a first circumferential wall (83) standing toward the valve seat (85) along a peripheral portion of the first bottom portion (82). The valve seat (85) includes a second bottom portion (86), and a second circumferential wall (87) standing toward the valve body (81) along a peripheral portion of the second bottom portion (86). One of the first circumferential wall (83) or the second circumferential wall (87) has an outside diameter smaller than an inside diameter of an open end of the other of the first circumferential wall (83) or the second circumferential wall (87).