Spindle Compressor Refrigerant Cooling for Efficiency
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Solution Overview
Problem
Current dry-compressing spindle compressors lack efficiency, reliability, and flexibility in power adjustment, especially at high network working pressures, and often require operating fluids and complex control mechanisms.
Innovation Solution
A multi-stage spindle compressor design with non-parallel rotation axes, using refrigerant for cooling and power adjustment, and incorporating post-inlet and pre-outlet feeds with regulating devices, along with a frequency converter for rotary speed control, to achieve efficient heat dissipation and flexible power management without an operating fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dry-compressing spindle compressor is used to eliminate operating fluid, then reliability and delivery medium purity are improved, but efficiency and power adjustment flexibility deteriorate
Solution Approach 1:
The patent applies parameter changes by using refrigerant cooling to dynamically control the clearance distances between spindle rotors and compressor housing. By adjusting the refrigerant flow rate and pressure level through separate regulating devices, the compression efficiency is optimized while maintaining the dry-compressing advantage of no operating fluid in the working space.
Solution Approach 2:
The invention implements dynamics through active thermal management of the spindle rotors and housing. The refrigerant cooling system dynamically adjusts clearance volumes during operation, allowing the compressor to adapt to different operating states and maintain high efficiency across varying load conditions without requiring operating fluid.
2Productivity
If refrigerant cooling is applied to maintain clearance distances, then compression efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using the refrigerant serving multiple functions: it cools the spindle rotors and compressor housing to maintain clearance distances, and simultaneously provides power adjustment through flow rate and pressure level control. The evaporators and regulating devices enable the refrigerant system to perform both thermal management and compression control functions.
Solution Approach 2:
The invention merges the cooling function and power adjustment function into a single integrated refrigerant system. By combining the evaporators for rotor and housing cooling with the regulating devices for flow and pressure control, the system achieves both efficiency maintenance and flexible power adjustment without requiring separate mechanisms.
3Adaptability or versatility
If multiple regulating devices are added for power adjustment, then power flexibility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by enabling the refrigerant system to perform both thermal management and power adjustment functions. The evaporators and regulating devices that control refrigerant flow for cooling also provide flexible power adjustment through flow rate and pressure level control, eliminating the need for separate power control mechanisms.
4Productivity
If non-parallel rotation axes are used to increase compression ratio, then compression capacity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by using refrigerant cooling to control the thermal expansion and dimensional stability of the spindle rotors and housing. This ensures that the non-parallel rotation axes maintain their precise geometric relationships during operation, compensating for potential manufacturing tolerances through active thermal management.
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 efficiency, reliability, and noise reduction by utilizing refrigerant for cooling, eliminating the need for separate refrigerating devices, reducing bearing loads, and allowing for flexible power adjustment without complex control valves, while maintaining high compression values in a single machine.
Implementation Method 1
the spindle rotors 2 and 3, as well as the surrounding compressor housing 8, are in each case cooled so specifically... through a partial-flow branch-off 25 of liquid refrigerant
Implementation Method 2
the respective rotor interior cooling system 6 or 7 is configured as a heat exchanger... for the liquid refrigerant
Implementation Method 3
this liquid refrigerant is then conveyed away for each spindle rotor by means of, for example, a pitot tube pump... and is then, according to the invention and in a novel manner, routed to the evaporator cooling system 9 for the compressor housing
Data Source
AI summary
The invention relates to a spindle compressor without operating fluid in the working space with a 2-tooth spindle rotor and a 3-tooth spindle rotor in a surrounding compressor housing-and preferably non-parallel rotation axes of the two spindle rotors, in particular for use in compression refrigeration machines. In order to improve the degree of efficiency while providing flexible power adjustment, it is proposed according to the invention that a multi-stage spindle compressor be used as a refrigerant compressor, whose compressor housing and whose spindle rotors are cooled via a partial-flow branch-off of liquid refrigerant from the refrigerant main flow circuit, wherein the compressor housing is cooled in a controlled manner by means of refrigerant evaporation, with the refrigerant vapor being subsequently fed to the inlet, and that, for power adjustment, there are also post-inlet feeds into the working space in addition to the inlet feed, and also pre-outlet discharges in addition to the outlet discharge from the outlet space, each with their own regulating device.