SEPARATED COOLANT CIRCULATION STRUCTURE FOR WATER-COOLED POWER GENERATOR AND COOLING METHOD THEREOF

• US 20150244223A1
• Filed: 02/23/2015
• Published: 08/27/2015
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: Doosan Heavy Industries and Construction Company Limited
• Original Assignee: Doosan Heavy Industries and Construction Company Limited
• Inventors: LEE, Hakjae
• Granted Patent: US 9,985,489 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02K 3/22 consisting of hollow conductors
• CPC Class Codes: H02K 3/24 with channels or ducts for cooling medium between the conductors
• CPC Class Codes: H02K 9/197 in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Abstract

A separated coolant circulation structure for a water-cooled power generator includes a cooling circulation channel for a stator bar to cool heat of a stator bar winding, and a cooling circulation channel for a connector ring to heat of a connector ring, wherein the cooling circulation channel for the stator bar and the cooling circulation channel for the connector ring form separate coolant supply paths to improve cooling efficiency and reduce a pump load.

Claims

1. A separated coolant circulation structure for a water-cooled power generator, comprising:

a cooling circulation channel for a stator bar to cool heat of a stator bar winding; and

a cooling circulation channel for a connector ring to cool heat of a connector ring,

wherein the cooling circulation channel for the stator bar and the cooling circulation channel for the connector ring form separated coolant supply paths to improve cooling efficiency and reduce a pump load.

2. The separated coolant circulation structure according to claim 1, wherein the cooling circulation channel for the stator bar includes an annular coolant supply ring for a collector end which is connected to a coolant inlet pipe, through which a coolant flows;

a stator inner channel for supplying the coolant to the stator winding, of which an inlet terminal positioned at a collector end side is connected to the coolant supply ring for the collector end; and

an annular coolant discharge ring for a turbine end that is connected to an outlet terminal of a turbine end side of the stator inner channel.

3. The separated coolant circulation structure according to claim 2, wherein the stator inner channel includes an upper channel passing an upper winding and a lower channel passing a lower winding, and

the upper channel and the lower channel respectively form a flow of the coolant in the same direction from the collector end side to the turbine end side.

4. The separated coolant circulation structure according to claim 3, wherein the cooling circulation channel for the connector ring includes the coolant supply ring for the collector end,

a connector ring outer channel for annually enclosing a circumference of the connector ring, of which an inlet terminal is connected to the coolant supply ring for the collector end to receive the coolant, and

an annular coolant discharge ring for the collector end that is connected to an outlet terminal of the connector ring outer channel.

5. The separated coolant circulation structure according to claim 4, wherein an inlet terminal of the stator inner channel is connected to the coolant supply ring for the collector end by at least one of a first set of coupling hoses,

an inlet terminal of the connector ring outer channel is connected to the coolant supply ring for the collector end by at least one of a second set of coupling hoses, and

an outer terminal end of the connector ring outer channel is connected to the coolant discharge ring for the collector end by at least one of a third set of coupling hoses.

6. The separated coolant circulation structure according to claim 5, wherein the first set of coupling hoses includes at least one first coupling hose, of which one end is connected to the coolant supply ring for the collector end to receive the coolant, and the other end is branched into a first outlet port and a second outlet port, and

the first outlet port and the second outlet port are respectively connected to the lower channel and the upper channel to feed the coolant into the lower and upper channels.

7. The separated coolant circulation structure according to claim 5, wherein the first set of coupling hoses includes at least one fourth coupling hose, of which one end is connected to the coolant supply ring for the collector end to receive the coolant, and the other end is branched into a first outlet port and a second outlet port, and

the first outlet port and the second outlet port are respectively connected to the lower channel and the upper channel to feed the coolant into the lower and upper channels.

8. The separated coolant circulation structure according to claim 5, wherein the first set of coupling hoses includes at least one third coupling hose,

the second set of coupling hoses includes at least one second coupling hose,

the third coupling hose and the second coupling hose are connected to the coolant supply ring for the collector end at each end to receive the coolant,

the coolant fed through the third coupling hose is supplied to the lower channel, and

the coolant fed through the second coupling hose is supplied to the connector ring outer channel.

9. The separated coolant circulation structure according to claim 5, wherein the first set of coupling hoses includes at least one sixth coupling hose,

the second set of coupling hoses includes at least one fifth coupling hose,

the fifth coupling hose and the sixth coupling hose are connected to the coolant supply ring for the collector end at each end to receive the coolant,

the coolant fed through the sixth coupling hose is supplied to the upper channel, and

the coolant fed through the fifth coupling hose is supplied to the connector ring outer channel.

10. The separated coolant circulation structure according to claim 5, wherein the first set of coupling hoses includes at least one third coupling hose;

the third set of coupling hoses includes at least one seventh coupling hose;

one end of the third coupling hose is connected to the coolant supply ring for the collector end to receive the coolant from the coolant supply ring for the collector end, and the other end is connected to the lower channel to supply the coolant to the lower channel; and

one end of the seventh coupling hose is connected to the outlet terminal of the connector ring outer channel to receive the coolant from the connector ring outer channel, and the other end is connected to the coolant discharge ring for the collector end to discharge the coolant to the coolant discharge ring for the collector end.

11. The separated coolant circulation structure according to claim 5, wherein the first set of coupling hoses includes at least one sixth coupling hose;

the third set of coupling hoses includes at least one eighth coupling hose;

one end of the eighth coupling hose is connected to the coolant supply ring for the collector end to receive the coolant from the coolant supply ring for the collector end, and the other end is connected to the upper channel to supply the coolant to the upper channel; and

one end of the eighth coupling hose is connected to the outlet terminal of the connector ring outer channel to receive the coolant from the connector ring outer channel, and the other end is connected to the coolant discharge ring for the collector end to discharge the coolant to the coolant discharge ring for the collector end.

12. The separated coolant circulation structure according to claim 5, wherein the connector ring outer channel is provided in plural in such a way that some portions are formed in an annularly cut shape, thereby enclosing the circumference of the connector ring,

each inlet terminal of the connector ring outer channels is connected to the coolant supply ring for the collector end by the second set of coupling hoses to receive the coolant, and

each outlet terminal is connected to the coolant discharge ring for the collector end by the third set of coupling hose to discharge the coolant.

13. The separated coolant circulation structure according to claim 3, wherein an outlet terminal of the stator inner channel at the turbine end side of the upper and lower channels is connected to the coolant discharge ring for the turbine end by the plurality of ninth coupling hoses,

one end of the ninth coupling hose is divided to a first inlet port and a second inlet port which receive the coolant from the upper and lower channels, respectively, and

the other end is connected to the coolant discharge ring for the turbine end in the shape of a single outlet to discharge the coolant.

14. A method of separately cooling a water-cooled power generator, comprising:

cooling heat of a stator winding by a cooling circulation channel for the stator winding;

cooling heat of a connector ring by a cooling circulation channel for the connector ring,

wherein the step of cooling the stator winding and the step of cooling the connector ring are carried out by each coolant supply path formed by the cooling circulation channel for the connector ring and the cooling circulation channel for the stator winding which are separately provided, thereby improving cooling efficiency and reducing a pump load.

15. The method of separately cooling the water-cooled power generator according to claim 14, wherein the step of cooling the stator wiring includes a step A of supplying a coolant from a coolant supply ring for a collector end to an inlet terminal of the collector end in a stator inner channel in a stator bar, and a step B of discharging the coolant from an outlet terminal of a turbine end in the stator inner channel to an annular coolant discharge ring for a turbine end.

16. The method of separately cooling the water-cooled power generator according to claim 15, wherein the step of cooling the connector ring includes a step C of supplying the coolant from the coolant supply ring for the collector end to an inlet terminal of a connector ring outer channel which annually encloses the circumference of the connector ring, and a step D of discharging the coolant from the outlet terminal of the connector ring outer channel to the coolant discharge ring for the collector end.

17. The method of separately cooling the water-cooled power generator according to claim 15, wherein in the step A, the coolant is supplied from the coolant supply ring for the collector end to a pair of an upper channel passing through an upper winding and a lower channel passing through a lower winding, and

the upper channel and the lower channel form a flow of the coolant in the same direction from the collector end to the turbine end.

18. The method of separately cooling the water-cooled power generator according to claim 16, wherein in the step A, the coolant is supplied from the coolant supply ring for the collector end via at least one of a first set of coupling hoses to the inlet terminal of the stator inner channel,

in the step C, the coolant is supplied from the coolant supply ring for the collector end via at least one of a second set of coupling hoses to the inlet terminal of the connector ring outer channel, and

in the step D, the coolant is discharged from the outlet terminal of the connector ring outer channel via at least one of a third set of coupling hoses to the coolant discharge ring for the collector end.

19. The method of separately cooling the water-cooled power generator according to claim 18, wherein in the step A, the coolant is supplied from the coolant supply ring for the collector end to one end of at least one first coupling hose of the first set of coupling hoses, and then is supplied to each of the upper channel and the lower channel through the other end of the first coupling hose which is divided into a first outlet port and a second outlet port.

20. The method of separately cooling the water-cooled power generator according to claim 18, wherein in the step A, the coolant is supplied from the coolant supply ring for the collector end to one end of at least one fourth coupling hose of the first set of coupling hoses, and then is supplied to each of the upper channel and the lower channel through the other end of the fourth coupling hose which is divided into a first outlet port and a second outlet port.