Variable flow particle separating structure

1. A particle separating structure for use with a turbine engine comprising:

a main housing including an inlet, a cooling fluid outlet, and a particle discharge zone;

first swirling structure for swirling cooling fluid passing through a first cooling fluid flowpath defined in said main housing;

second swirling structure for swirling cooling fluid passing through a second cooling fluid flowpath defined in said main housing;

wherein:

said first swirling structure is positionable in at least two positions, a first position allowing cooling fluid to pass through said first cooling fluid flowpath and a second position allowing cooling fluid to pass through said first and second cooling fluid flowpaths; and

the swirling of the cooling fluid effected by said first and second swirling structures causes particles in the cooling fluid to pass to said particle discharge zone while the cooling fluid passes out of said main housing through said cooling fluid outlet.

2. The particle separating structure according to claim 1 , wherein said particle discharge zone comprises an annular particle collection chamber.

3. The particle separating structure according to claim 2 , wherein said particle discharge zone further comprises a particle outlet located in a bottom portion of said particle collection chamber.

4. The particle separating structure according to claim 1 , wherein said cooling fluid outlet is located radially inwardly from said particle discharge zone.

5. The particle separating structure according to claim 1 , wherein said first swirling structure moves axially between said first and second positions based on an amount of cooling fluid entering said main housing inlet.

6. The particle separating structure according to claim 5 , wherein:

said first swirling structure is positioned in its first position when a first amount of cooling fluid enters said main housing inlet; and

said first swirling structure is caused to be positioned in its second position when a second amount of cooling fluid greater than the first amount enters said main housing inlet.

7. The particle separating structure according to claim 6 , wherein said main housing further comprises a first stop structure, said first stop structure is engaged by said first swirling structure when in its first position to prevent said first swirling structure from moving axially past a desired foremost position.

8. The particle separating structure according to claim 7 , further comprising a second stop structure, said second stop structure is engaged by said first swirling structure when in its second position to prevent said first swirling structure from moving axially past a desired aftmost position.

9. The particle separating structure according to claim 7 , further comprising a biasing member for biasing said first swirling structure axially toward said first stop structure.

10. The particle separating structure according to claim 1 , wherein said first swirling structure is positionable in at least one position between said first and second positions.

11. The particle separating structure according to claim 10 , wherein:

said first swirling structure is positioned in its first position when a first amount of cooling fluid enters said main housing inlet;

said first swirling structure is caused to be positioned in its second position when a second amount of cooling fluid greater than the first amount enters said main housing inlet; and

said first swirling structure is caused to be positioned in a position between said first and second positions when an amount of cooling fluid entering said main housing inlet is greater than the first amount but less than the second amount.

12. The particle separating structure according to claim 1 , wherein said first swirling structure comprises a plurality of swirl members, each swirl member comprising a leading edge and a trailing edge offset from said leading edge in a circumferential direction.

13. The particle separating structure according to claim 12 , wherein said second swirling structure comprises a plurality of swirl members, each swirl member comprising a leading edge and a trailing edge offset from said leading edge in the circumferential direction.

14. A particle separating structure for use with a turbine engine comprising:

a main housing comprising:

an inlet;

a cooling fluid outlet;

a particle discharge zone located radially outwardly from said cooling fluid outlet;

a first stop structure; and

a biasing member;

first swirling structure in said main housing for swirling cooling fluid passing through a first cooling fluid flowpath defined in said main housing;

wherein:

said first swirling structure is positionable in at least two positions, said positions based on an amount of cooling fluid entering said main housing through said inlet, a first position of said first swirling structure allowing cooling fluid to pass through said first cooling fluid flowpath and a second position of said first swirling structure allowing a first portion of cooling fluid to pass through said first cooling fluid flowpath and a second portion of cooling fluid to bypass at least a section of said first cooling fluid flowpath;

said biasing member biases said first swirling structure toward said first stop structure such that said first swirling structure engages said first stop structure when in its first position; and

the swirling of the cooling fluid effected by said first swirling structure causes particles in the cooling fluid to pass to said particle discharge zone while the cooling fluid passes out of said main housing through said cooling fluid outlet.

15. The particle separating structure according to claim 14 , further comprising second swirling structure in said main housing for swirling the second portion of cooling fluid.