Scroll Compressor Back Pressure Valve Dynamics
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Solution Overview
Problem
Existing scroll compressors face challenges in maintaining optimal back pressure in the back pressure chamber, leading to inefficiencies such as excessive frictional loss and inadequate response to changes in operating conditions.
Innovation Solution
A back pressure regulating valve is introduced, comprising a valve housing with a piston mechanism that adjusts the back pressure by controlling the communication between the discharging chamber, back pressure chamber, and suction chamber, ensuring optimal back pressure levels based on changes in discharging and suction pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the back pressure hole is formed on the head plate surface, then the structure is simple, but the back pressure cannot be properly regulated when running conditions change
Solution Approach 1:
The back pressure hole is designed to move dynamically with the orbiting scroll's rotation, transitioning from a fixed position on the head plate to a position on the wrap surface that changes with the scroll's angular position. This dynamic positioning enables the system to adapt back pressure regulation to varying running conditions while maintaining structural simplicity.
Solution Approach 2:
The back pressure hole is pre-positioned on the wrap surface at a location that will be in the appropriate position relative to the fixed scroll during operation. This preliminary positioning ensures that high-pressure gas can flow into the back pressure chamber at the correct moment in the compression cycle, enabling proper back pressure regulation without complex control mechanisms.
2Reliability
If the back pressure is increased to minimize the axial gap between scrolls, then leakage is reduced, but frictional loss increases
Solution Approach 1:
The back pressure is dynamically regulated by the moving back pressure hole's position and the resulting gas flow timing, rather than being fixed at a high level. This dynamic regulation maintains sufficient back pressure to minimize leakage while avoiding excessive back pressure that would cause the orbiting scroll to press too closely against the fixed scroll, thereby reducing frictional loss.
Solution Approach 2:
The system changes the timing and magnitude of back pressure by varying the position of the back pressure hole during the compression cycle. This parameter change enables optimization of the balance between leakage prevention and friction reduction by adjusting back pressure levels according to the instantaneous operating conditions.
3Speed
If the back pressure hole is positioned at the centering part, then high pressure gas flows rapidly into the back pressure chamber, but the response to running condition changes is slow
Solution Approach 1:
The back pressure hole's position is made dynamic rather than fixed at the centering part. As the orbiting scroll rotates, the back pressure hole moves to different angular positions, allowing the system to rapidly respond to changes in running conditions by positioning the hole optimally relative to the compression chamber at different times in the cycle.
Solution Approach 2:
The back pressure regulation operates periodically with the rotation of the orbiting scroll, with the back pressure hole passing through different positions in each rotation cycle. This periodic action enables the system to maintain rapid gas flow while also responding quickly to running condition changes by adjusting the timing of gas flow into the back pressure chamber.
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 valve effectively maintains optimal back pressure, minimizing leakage and frictional loss between the fixed and orbiting scrolls, while rapidly adjusting to changes in operating conditions, thereby enhancing the efficiency of the scroll compressor.
Implementation Method 1
A back pressure regulating valve is introduced, comprising a valve housing with a piston mechanism that adjusts the back pressure by controlling the communication between the discharging chamber, back pressure chamber, and suction chamber
Implementation Method 2
the piston is configured to move up and down within the first and the second housing
Implementation Method 3
a connecting rod for connecting the first piston to the second piston
Data Source
AI summary
Provided is a back pressure regulating valve and an electric type of a scroll compressor with the same. A valve of an electric scroll compressor for regulating a back pressure includes a valve housing including a first housing 11, a second housing and a communicating passage 13 for connecting the first housing 11 to the second housing 12; and a piston 14 including a first piston 141 located within the first housing 11, a second piston located within the second housing 12 and a connecting rod 143 for connecting the first piston 141 to the second piston 142, wherein the piston 14 is configured to move up and down within the first and the second housing 11, 12.