Scroll Compressor Bypass Valve Delivery Line Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing scroll refrigeration compressors face challenges with difficult valve installation on the stationary volute due to high pressure/low pressure separation bells and sealing elements, leading to potential refrigerant leaks and overheating issues, especially when there are connection faults in the power supply wires causing rotation direction inversions.
Innovation Solution
A scroll refrigeration compressor design featuring anti-return devices with bypass passages and valves that open upstream from the delivery valve, allowing for easy mounting and reducing the risk of leaks, and automatically adjusting to prevent overheating by communicating low pressure portions with the delivery line in case of rotation inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If bypass valves are installed on the upper surface of the stationary volute, then the compression rate can be reduced and energy efficiency improved, but the installation becomes difficult or impossible due to high pressure/low pressure separation bells and sealing elements
Solution Approach 1:
The bypass valve is relocated from the upper surface of the stationary volute to the delivery line, changing the spatial dimension of installation. This allows the valve to be positioned where it can still control compression rate while avoiding the obstructed upper surface area covered by separation bells and sealing elements.
Solution Approach 2:
The delivery line serves as an intermediary structure that hosts the bypass valve. Instead of directly installing the valve on the stationary volute surface, the delivery line acts as a mediator platform, enabling valve installation while maintaining the functional relationship between the bypass valve and the compression chambers.
2Adaptability or versatility
If bypass valves are installed on the stationary volute, then compression rate control is improved, but seal faults may cause refrigerant leaks and migration from high pressure to low pressure portions
Solution Approach 1:
The delivery line acts as an intermediary that connects the compression chambers to the delivery chamber while hosting the bypass valve. This intermediary structure provides a controlled pathway for refrigerant flow, reducing the risk of leaks compared to direct installation on the stationary volute surface where sealing elements are present.
Solution Approach 2:
The bypass valve is extracted from the stationary volute structure and relocated to the delivery line. This separation removes the valve from the area prone to seal faults, thereby extracting the source of potential refrigerant leakage while preserving the compression rate control functionality.
3Device complexity
If the compressor operates with standard delivery valve positioning, then the structure is simple, but connection faults in power supply wires causing rotation inversion lead to overheating and wear of volutes
Solution Approach 1:
The bypass valve positioned in the delivery line provides a preliminary protective mechanism against the harmful effects of rotation inversion. When rotation inversion occurs, the bypass valve can open to relieve pressure and prevent the severe overheating and wear that would otherwise occur, acting as a preemptive safety measure.
Solution Approach 2:
The bypass valve system provides self-service protection against rotation inversion faults. When abnormal conditions occur due to power supply faults, the bypass valve automatically activates based on pressure differential, providing self-protection without requiring external control systems or complex monitoring mechanisms.
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 enhances the compressor's performance by preventing leaks and overheating, ensuring reliable operation and easy valve installation, even with high pressure/low pressure separation plates, and protects against power supply faults.
Implementation Method 1
the bypass valve being designed so as to be elastically deformed towards its opening position and puts the low pressure portion into communication with the delivery line
Implementation Method 2
the delivery valve being designed so as to be displaced into its release position when the pressure in the delivery line exceeds the pressure in the delivery chamber by a first predetermined value
Implementation Method 3
both scrolls being engaged into each other and delimiting compression chambers of variable volume, the compression chambers having a volume which gradually decreases from the outside
Data Source
AI summary
A compressor including: a stationary volute and a moving volute each including a plate provided with a scroll, said scrolls defining variable-volume compression chambers; a delivery line provided in the plate of the stationary volute; a delivery port arranged such as to establish a communication between the delivery line and a delivery chamber; and a non-return device including (i) a valve seat surrounding the delivery port and (ii) a delivery valve which can move between delivery port opening and closing positions. The compressor includes: at least one bypass passage having a first end opening into the delivery line at a point between the central compression chamber and the valve seat and a second end opening into an intermediate compression chamber or into a low-pressure portion of the compressor, and at least one bypass valve which can move between bypass passage closing and opening positions.