Rotary sliding vane compressor and blade therefor

Abstract

Disclosed is a blade for a rotary blade compressor. The blade has at least two section pieces, with any two adjacent section pieces being radially aligned with each other at a junction, wherein further there is a force applying means at said junction forcing the adjacent blade section pieces apart from each other in an axial direction. The edges of said blade will thereby be positioned to form a seal against the head plates of the compressor.

Description

BACKGROUND OF THE INVENTION[0001]A “sliding” rotary vane compressor is a positive displacement machine that uses a rotor, which may be, but is not necessarily, eccentric, placed within a cylindrical chamber that is located within a rotor housing and is used to compress compressible fluids such as gases. The rotor has slots along its length, and each slot contains a blade, i.e. a vane. The vanes are thrown outwards (radially) by centrifugal force when the compressor is running and the vanes move in and out of the slot. The outer (radial) edge of the blades will follow the contour of the inner chamber wall, and the two side (axial) edges of the blades will each be adjacent to a side head plate of the compressor. The vanes thereby create individual cells or pockets of gas which, because of the vanes' movement, are compressed as the rotor turns. The vanes sweep the cylinder, sucking air in on one side and ejecting it on the other. As each cell approaches the discharge port, its volume i...

AI Technical Summary

Benefits of technology

The patent text describes a sliding vane compressor and its components. The technical problem addressed in the patent is the control of discharge temperature to avoid damage to the compressor. The main cause of increased discharge temperature is leakage of air from pocket to pocket within the compressor. The patent proposes a solution to this problem by developing a multi-sectioned blade with a tight seal between the vanes and the compressor head plates, and a joint at adjoining blade sections that provides a tight seal while automatically compensating for wear. The patent also describes the use of an oil flooded rotary vane compressor and a means of detecting advanced blade wear to prevent damage to the compressor.

Problems solved by technology

Uncontrolled discharge temperature can lead to thermal growth of internal components causing jamming, internal components degrading or melting and lubrication failure.

One cause of increased discharge temperature is the leakage of air from pocket to pocket within the compressor.

With this cycle being continuously repeated, this will result in a steady increase in discharge temperature, causing the problems discussed above.

Poorly sealing blades are the main causes for leakage from a pocket that is at a higher pressure to an adjacent pocket that is at a lower pressure.

Numerous conditions may cause excessive leakage across a blade.

The major sources for leakage are intermittent sealing contact of the blade tip at the cylinder wall, little or no axial sealing contact at the head plates located at both ends of the cylinder housing, and poor sealing contact in the rotor slot.

However, using a multi-sectioned blade may create its own disadvantage in that another significant leakage path is for air to travel from one pocket to an adjacent pocket at the joints between the multiple piece blade sections.

Such blades, however, are much more subject to wear then conventional compressor blades.

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