Scroll Compressor Anti-Return Device Mounting
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Solution Overview
Problem
Existing scroll-type refrigerator compressors face challenges with pressure pulsations and dead spaces due to the positioning of anti-return devices, making it difficult to mount and maintain them, especially when access to the upper volute is hindered by a bell or seal elements.
Innovation Solution
A scroll-type refrigerator compressor design featuring a housing on the volute surface for easy mounting of an anti-return device, which includes a movable valve and an obturation device to prevent fluid communication and reduce pressure fluctuations, allowing for flexible orifice shapes and sizes, and control mechanisms to manage the device's position based on pressure circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-return device is positioned on the upper surface of the fixed volute, then refrigerant gas backflow is prevented, but mounting becomes difficult or impossible due to limited access
Solution Approach 1:
Instead of positioning the anti-return device on the upper surface of the fixed volute (conventional approach), the invention inverts the approach by positioning it on the lower surface of the fixed volute plate. This inversion provides easy access for mounting while still effectively preventing refrigerant gas backflow from the compression chamber to the injection means.
2Ease of operation
If injection and bypass valves are positioned far from the passage orifice, then valve control is improved, but dead space increases causing pressure pulsations
Solution Approach 1:
The invention positions the anti-return device in proximity to the passage orifice on the lower surface of the fixed volute plate, utilizing the dimensional space available on the lower surface. This close positioning minimizes dead space volume and prevents pressure pulsations while still allowing effective control of refrigerant flow.
3Reliability
If the fixed volute plate surface is covered by a bell or seal elements, then discharge sealing is improved, but access for mounting anti-return devices is hindered
Solution Approach 1:
Instead of attempting to mount the anti-return device on the upper surface where the bell or seal elements block access, the invention inverts the mounting location to the lower surface of the fixed volute plate. This provides unobstructed access for mounting and maintenance while the bell and seal elements remain in place to ensure discharge sealing.
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 design simplifies the installation of anti-return devices, reduces fluid leaks, and enhances compressor efficiency by minimizing dead spaces and pressure pulsations, thereby improving performance and yield.
Implementation Method 1
an anti-return device (26) mounted in the housing (25), arranged so as to prevent communication between means for discharging and/or injecting refrigerant fluid and the compression chamber (14) into which the housing (25) opens out in a first closed position, and arranged so as to allow communication between the means for discharging and/or injecting refrigerant fluid and the compression chamber (14) into which the housing (25) opens out in a second open position
Implementation Method 2
control means (137) arranged so as to displace the anti-return device (26) between its closed and open positions
Data Source
AI summary
This compressor comprises first and second volutes describing an orbital relative movement and each comprising a plate from which a spiral extends, the two spirals being engaged one inside the other and defining pairs of compression chambers of variable volume. The compressor has a housing formed in that surface of the plate of the first volute which is turned towards the spirals, which housing opens into one of the compression chambers, refrigerant delivery means leading into the housing, and a nonreturn device being mounted in the housing, the nonreturn device preventing communication between the delivery means and the compression chamber into which housing opens in a first or closed position, and allowing communication between the delivery means and said compression chamber in a second or open position.