Method of cooling a hot isostatic pressing device and a hot isostatic pressing tool

1. A method of cooling a load provided in a load compartment in a furnace chamber of a furnace of a hot isostatic pressing device, comprising:

releasing hot pressure medium from the load compartment;

providing cool pressure medium and enabling it to fall through the released hot pressure medium outside the load compartment; and

leading the thus obtained mixed pressure medium into the load compartment.

2. The method as claimed in claim 1 wherein said mixed pressure medium, after having been led into the load compartment, is released from the load compartment as hot pressure medium to be mixed with the cool pressure medium.

3. The method as claimed in claim 1 wherein the cool pressure medium is introduced into a flow of released hot pressure medium at a higher level of the furnace than a level at which the mixed pressure medium is led into the load compartment.

4. The method as claimed in claim 3 wherein the cool pressure medium is introduced into the released hot pressure medium above half a height of the load compartment, preferably at a level near a top portion of the load compartment.

5. The method as claimed in claim 1 wherein the hot pressure medium is released from the load compartment at a top portion thereof.

6. The method as claimed in claim 1 wherein a part of the mixed pressure medium is diverted from the rest of the mixed pressure medium so as to be cooled down and recycled as the cool pressure medium to be mixed with new released hot pressure medium.

7. The method as claimed in claim 1 wherein the cool pressure medium is led in a shielded manner through the load compartment from a bottom portion to the top portion thereof, so as to prevent mixing with the hot pressure medium inside the load compartment but allow mixing with the hot pressure medium outside the load compartment at a top portion thereof.

8. The method as claimed in claim 1 wherein the cool pressure medium is led at a side of the load compartment to the top portion thereof for allowing mixing with the hot pressure medium outside the load compartment at the top portion thereof.

9. The method as claimed in claim 1 wherein a gas is used as said pressure medium.

10. The method as claimed in claim 9 wherein said gas is an inert gas.

11. The method as claimed in claim 10 wherein said inert gas is argon.

12. A method, comprising:

venting, at a first height near an upper portion of a load compartment of a pressure chamber, warm pressure medium from the load compartment to a first region surrounding the load compartment; and

introducing, at a second height, near the first height, cool pressure medium, having a lower temperature than a temperature of the warm pressure medium, into the first region.

13. The method of claim 12 wherein the second height is above the first height.

14. The method of claim 12 , comprising admitting, at a third height, below the first and second heights, a mixture of the warm and cool pressure mediums into the load compartment.

15. The method of claim 12 , comprising admitting a mixture of the warm and cool pressure mediums into a second region adjacent to an outer wall of the pressure chamber.

16. The method of claim 15 , comprising admitting, at a fourth height lower than the third height, the cool pressure medium from the second region to a conduit configured to conduct the cool pressure medium to the second height.

17. The method of claim 12 , comprising admitting, at a fourth height lower than the third height, the cool pressure medium from outside the pressure chamber to a conduit configured to conduct the cool pressure medium to the second height.

18. The method of claim 12 wherein the introducing step includes introducing the cool pressure medium from one or more apertures located above the load compartment.