Asynchronous non-constant-pitch spiral scroll-type fluid displacement machine

Abstract

A scroll-type spiral fluid displacement machine having at least one pair of interfitting scroll elements. The scroll vanes of the scroll elements are constructed upon a base line spiral defined by the equation:L=K0φK1e−φ / <sub2>K2 < / sub2>where L is the distance from the spiral's origin to any point on the spiral curve, φ is the angular displacement of the spiral, K0 is a constant greater than 1, K1, is a constant greater than 1, and K2 is a constant greater than 10.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This application relates generally to a spiral scroll-type fluid displacement machine and more particularly to an asynchronous non-constant pitch spiral scroll-type fluid displacement machine.[0003]2. Description of the Related Art[0004]Generally, a conventional spiral scroll-type fluid displacement machine is formed with a pair of scroll elements (i.e., an orbiting scroll element and a fixed scroll element) each having spiral vanes that are fitted together in a certain predetermined way to intake fluid such as air or water through an intake port. The interfitting spiral vanes create one or more fluid pockets and trap the fluid inside the pocket(s) by moving the orbiting scroll element in a predetermined manner. The fluid pocket moves toward an outlet port while maintaining pressure in the pocket by continuously moving the orbiting scroll element within the interfitted fixed scroll element. The pressurized fluid is disc...

AI Technical Summary

Benefits of technology

[0011]With the aid of sophisticated computer-based real-time measurement systems and advanced computer fluid dynamics analysis, it was found that fluid pressure distribution and variation during the operation of scroll-type fluid displacement machines is key to the design of a new fluid displacement machine structure, and to choose an appropriate curve for scroll wraps. The present fluid displacement machine overcomes the general shortcomings of current machines and manifest inherent advantages such as high efficiency, low noise, low vibration and enhanced durability. With such consideration and using an optimization technique, the present invention uses a single, continuous curve as the base line for constructing scroll vanes.

Problems solved by technology

With such orbiting motion, the line contacts between the spiral vanes of the fixed and orbiting scrolls move along the curved surfaces of spiral wraps, thereby creating fluid pockets and possibly changing the volume of (and thus the pressure in) the fluid pockets.

Although this design concept of scroll-type fluid displacement machines appeared as early as the beginning of twentieth century, its development was hindered due the difficulty to optimize its design and the requirement for high precision machining.

However, the conventional scroll-type fluid displacement machines have problems in that the fluid pressure distribution and the fluid pressure variation during operation are not optimized such that the conventional scroll-type fluid displacement machines have the shortcomings less-than-optimal efficiency, and relatively high noise and vibration, all of which contributes to decreased durability of the machines.

Images