ARRANGEMENT IN A LIQUID COOLER

• US 20110146962A1
• Filed: 11/18/2010
• Published: 06/23/2011
• Est. Priority Date: 12/18/2009
• Status: Active Grant

• Current Assignee: Vacon Oy (Danfoss A/S)
• Original Assignee: Vacon Oy (Danfoss A/S)
• Inventors: KAMULA, Petri
• Granted Patent: US 9,022,101 B2
• Time in Patent Office: Days
• US Class Current: 165/175
• CPC Class Codes: H05K 7/20927 Liquid coolant without phase change

Abstract

Arrangement for circulating liquid in a liquid cooler (11) intended particularly for power electronics appliances, inside which cooler at least two longitudinal main ducts (22, 23) are arranged and transverse ducts (21) arranged between them and connecting them, and in which cooler at least one of the longitudinal ducts is an input duct (22), into which liquid from coming from outside is led via an input joint (12) and one is an output duct (23), from where the liquid is led out via the output joint (13), inside which output duct a tubular additional part (41) having an open end at least on the side of the output joint is installed, and which additional part is arranged detached from the output duct such that a gap remains between the outer surface of the additional part and the inner surface of the output duct for enabling a liquid flow in the output duct outside the additional part, and in which arrangement a first aperture or first apertures (P, N, P2) are arranged in the part of the additional part on the output joint side and/or in the output joint and/or between them for enabling a first path of passage for a part of the nominal total flow to the output joint, and a second aperture or second apertures (T, P1) are arranged in the part of the additional part that is farther from the output joint or between the additional part and the output duct for enabling a second path of passage for the remaining part of the total flow into the additional part and via it onwards to the output joint.

Claims

1. Arrangement for circulating liquid in a liquid cooler (11) intended particularly for power electronics appliances, inside which cooler at least two longitudinal main ducts (22, 23) are arranged and transverse ducts (21) arranged between them and connecting them, and in which cooler at least one of the longitudinal ducts is an input duct (22), into which liquid from outside is led via an input joint (12) and one is an output duct (23), from where the liquid is led out via an output joint (13),

characterized in that

a tubular additional part (41) having an open end at least on the side of the output joint is installed inside the output duct, and

which additional part is arranged detached from the output duct such that a gap remains between the outer surface of the additional part and the inner surface of the output duct for enabling a liquid flow in the output duct outside the additional part, and

in which arrangement a first aperture or first apertures (P, N, P2) are arranged in the part of the additional part on the output joint side and/or in the output joint and/or between them for enabling a first path of passage for a part of the nominal total flow to the output joint, and

a second aperture or second apertures (T, P1) are arranged in the part of the additional part that is farthest from the output joint or between the additional part and the output duct for enabling a second path of passage for the remaining part of the total flow into the additional part and via it onwards to the output joint.

2. Arrangement according to claim 1,

characterized in that

the total surface area of the first apertures (P, N, P2), such as a gap (P2) between the additional part and the output joint or slots (P) or apertures (N) located in these parts, that are arranged in the part of the additional part on the output joint side and/or in the output joint is 30%-70% of the inner cross-sectional area of the additional part (41).

3. Arrangement according to claim 1,

characterized in that

some, preferably most, of the holes (P) of the part on the output joint side, are disposed at a level that is closer to the output joint (13) than the level (H₁) of the center point of the closest transverse duct (TC₁).

4. Arrangement according to claim 1,

characterized in that

the second path of passage of outgoing liquid situated farther from the output joint into the additional part is implemented such that the additional part is shorter than the output duct, in which case a free liquid flow into it via the aperture of its open top end is possible.

5. Arrangement according to claim 4,

characterized in that

the length of the additional part is such that at least one-half of the diameter of the additional part is between the level of its top end and the level of the top end of the output duct.

6. Arrangement according to claim 1,

characterized in that

the additional part (41) is fixed to the top end of the output duct (23), in which case the second path of passage of outgoing liquid situated farther from the output joint into the additional part is implemented via the apertures (P1) or slots disposed in the top end of the additional part.

7. Arrangement according to claim 1,

characterized in that

the gap between the outer surface of the additional part and the main duct is at least as great as the inner cross-sectional area of the additional part.

8. Arrangement according to claim 1,

characterized in that

the length of the additional part is such that the level (H₄₁) of the end (top end, T) that is farther from the output joint, or the level of the center points of the holes disposed in this end, is located farther from the joint (13) than the level (H_N) of the center point of the topmost transverse duct (TC_N).

9. Arrangement according to claim 2,

characterized in that

some, preferably most, of the holes (P) of the part on the output joint side, are disposed at a level that is closer to the output joint (13) than the level (H₁) of the center point of the closest transverse duct (TC₁).

10. Arrangement according to claim 2,

characterized in that

the second path of passage of outgoing liquid situated farther from the output joint into the additional part is implemented such that the additional part is shorter than the output duct, in which case a free liquid flow into it via the aperture of its open top end is possible.

11. Arrangement according to claim 3,

characterized in that

the second path of passage of outgoing liquid situated farther from the output joint into the additional part is implemented such that the additional part is shorter than the output duct, in which case a free liquid flow into it via the aperture of its open top end is possible.

12. Arrangement according to claim 2,

characterized in that

the additional part (41) is fixed to the top end of the output duct (23), in which case the second path of passage of outgoing liquid situated farther from the output joint into the additional part is implemented via the apertures (P1) or slots disposed in the top end of the additional part.

13. Arrangement according to claim 3,

characterized in that

the additional part (41) is fixed to the top end of the output duct (23), in which case the second path of passage of outgoing liquid situated farther from the output joint into the additional part is implemented via the apertures (P1) or slots disposed in the top end of the additional part.

14. Arrangement according to claim 2,

characterized in that

the gap between the outer surface of the additional part and the main duct is at least as great as the inner cross-sectional area of the additional part.

15. Arrangement according to claim 3,

characterized in that

the gap between the outer surface of the additional part and the main duct is at least as great as the inner cross-sectional area of the additional part.

16. Arrangement according to claim 4,

characterized in that

the gap between the outer surface of the additional part and the main duct is at least as great as the inner cross-sectional area of the additional part.

17. Arrangement according to claim 5,

characterized in that

the gap between the outer surface of the additional part and the main duct is at least as great as the inner cross-sectional area of the additional part.

18. Arrangement according to claim 6,

characterized in that

the gap between the outer surface of the additional part and the main duct is at least as great as the inner cross-sectional area of the additional part.

19. Arrangement according to claim 2,

characterized in that

the length of the additional part is such that the level (H₄₁) of the end (top end, T) that is farther from the output joint, or the level of the center points of the holes disposed in this end, is located farther from the joint (13) than the level (H_N) of the center point of the topmost transverse duct (TC_N).

20. Arrangement according to claim 3,

characterized in that

the length of the additional part is such that the level (H₄₁) of the end (top end, T) that is farther from the output joint, or the level of the center points of the holes disposed in this end, is located farther from the joint (13) than the level (H_N) of the center point of the topmost transverse duct (TC_N).