Method and apparatus for sealing a rotating machine using floating seals

1. A fluid machine comprising:

a housing; and

a rotating portion rotating at least partially disposed within the housing;

said housing coupled to a seal assembly comprising a plurality of seal channels and a plurality of seal rings, each of the plurality of seal channels comprising a respective one of the plurality of seal rings and a sealing surface, said seal rings comprising a lateral surface sealing against the rotating portion to form a first seal and a seal ring surface contacting the sealing surface to form a second seal.

2. The fluid machine as recited in claim 1 wherein the plurality of rings comprise a first seal ring surface contacting the rotating portion.

3. The fluid machine as recited in claim 2 wherein the first seal ring surface extends in a lateral direction.

4. The fluid machine as recited in claim 2 wherein the first seal ring surface engages the rotating portion.

5. The fluid machine as recited in claim 4 wherein the rotating portion comprises an impeller.

6. The fluid machine as recited in claim 4 wherein the rotating portion comprises an impeller of a centrifugal pump and the housing comprises a housing of a centrifugal pump.

7. The fluid machine as recited in claim 4 wherein the plurality of seal rings comprise a second seal ring surface.

8. The fluid machine as recited in claim 7 wherein the second seal ring surface is disposed in a radially extending direction.

9. The fluid machine as recited in claim 7 wherein the second seal ring surface has a notch disposed therein.

10. The fluid machine as recited in claim 1 wherein the rotating portion comprises a flange and wherein the plurality of seal rings contact an impeller of a centrifugal pump.

11. The fluid machine as recited in claim 1 wherein the plurality of seal rings are composed of one of plastic, graphite filled plastic, glass filled Noryl®, brass and Teflon®.

12. A method of sealing a rotating portion of a fluid machine to a housing;

providing a plurality of seal rings in respective seal channels of a seal assembly;

sealing a lateral edge of the seal against a surface of the rotating portion to form a first seal;

sealing a radially extending surface of the seal ring against a respective sealing surface of the seal channel to form a second seal;

moving the rotating portion relative to the seal assembly; and

moving the seal rings independently within the seal channels to compensate for moving the rotating portion to prevent leakage based upon various alignments of the rotating portion.

13. The method of claim 12 further comprising providing the sealing ring with a notch on a sealing surface.