CN115360838B - Gear yoke separation type counter-flow ventilation cooling system of large-scale bulk winding synchronous motor - Google Patents
Gear yoke separation type counter-flow ventilation cooling system of large-scale bulk winding synchronous motor Download PDFInfo
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- CN115360838B CN115360838B CN202211148481.1A CN202211148481A CN115360838B CN 115360838 B CN115360838 B CN 115360838B CN 202211148481 A CN202211148481 A CN 202211148481A CN 115360838 B CN115360838 B CN 115360838B
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- tooth
- yoke
- cooler
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
- H02K9/18—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a tooth yoke separation type counter-flow ventilation cooling system of a large-scale scattered winding synchronous motor, which relates to a ventilation cooling system of a large-scale steam turbine generator. The yoke part is provided with a plurality of yoke part ventilation grooves, two ends of the yoke part are provided with end structural members, a plurality of yoke part axial ventilation holes are uniformly distributed on the yoke part and the end structural members, the tooth part is provided with a plurality of tooth part radial ventilation grooves, and a plurality of tooth axial vent holes are formed in the tooth, a first cooler is arranged above and below the stator core, and a second cooler and a third cooler are respectively arranged at rotor air inlet areas on the left side and the right side of the rotating shaft. The stator windings are transposed and uniformly dispersed in the tooth ventilation grooves. The invention can simultaneously realize the direct reduction of the tooth temperature and the winding temperature, and greatly improves the cooling capacity of the large synchronous motor.
Description
Technical Field
The invention relates to a ventilating and cooling system of a large-sized steam turbine generator, in particular to a tooth yoke separation type counter-flow ventilating and cooling system of a large-sized scattered winding synchronous motor, and belongs to the technical field of electrical engineering.
Background
The large synchronous generator has higher capacity, larger size and higher stator winding density, and a large amount of heat can be generated in the stator core during operation. For a traditional large synchronous motor, a radial ventilation cooling mode of stator core tooth yoke communication is generally adopted. However, since the tooth yoke of the stator core is in a communication state, the cooling medium flows through the yoke first, is heated by the yoke and then flows to the tooth to cool the tooth, and the higher temperature of the yoke causes a larger temperature rise to the cooling medium, so that the cooling effect on the tooth is poor. In addition, because the strands in the stator slots are densely distributed and wrapped in an insulating manner has a large influence on heat dissipation, the contact area of the stator winding and the cooling medium in the ventilation grooves is small, and the cooling medium cannot fully carry away heat generated by the stator winding.
Disclosure of Invention
The invention aims to solve the problems that the traditional synchronous motor cooling mode is difficult in heat dissipation of windings and the teeth are easy to overheat, and further provides a large-scale scattered winding synchronous motor tooth yoke separation type countercurrent ventilation cooling system.
The technical scheme adopted by the invention for solving the problems is as follows:
the invention comprises a stator core, end structural members, a yoke, teeth, a baffle, a rotating shaft and a plurality of coolers, wherein the stator core is sleeved on the rotating shaft, the yoke is provided with a plurality of yoke radial ventilation grooves from outside to inside, the two ends of the yoke are provided with the end structural members, the yoke and the end structural members are uniformly provided with a plurality of yoke axial ventilation holes, the teeth are provided with a plurality of tooth radial ventilation grooves, the teeth are provided with a plurality of tooth axial ventilation holes, the baffle is arranged between the yoke and the teeth, a first cooler is arranged above and below the stator core, and a second cooler and a third cooler are respectively arranged at rotor air inlet areas at the left side and the right side of the rotating shaft.
Further, the large-scale scattered winding synchronous motor tooth yoke separation type counter-flow ventilation cooling system further comprises a stator winding and a cooling water pipe, wherein the stator winding is embedded in the tooth part of the stator core, and the cooling water pipe is embedded in the stator winding. The stator windings are transposed and uniformly dispersed in the radial ventilation grooves of the teeth, each layer of windings gradually moves down one layer from top to bottom, and the winding at the uppermost layer moves to the first layer. The tooth radial ventilation groove number m and the stator winding strand number q satisfy m/q=n, where n is an integer arbitrarily greater than 0.
Further, the large-scale scattered winding synchronous motor tooth yoke separation type counter-flow ventilation cooling system further comprises a multistage axial flow fan and a centrifugal fan, wherein the multistage axial flow fan is arranged at one end of the rotating shaft, and the centrifugal fan is arranged at the other end of the rotating shaft.
Further, the large-scale scattered winding synchronous motor tooth yoke separation type counter-current ventilation cooling system further comprises a first partition plate, an air outlet area is arranged between the first partition plate and the end part of the stator core, a rotor air inlet area is arranged between the partition plate and the casing, and a channel is arranged at the position, close to the cooler, of the air outlet area and the rotor air inlet area.
Further, an air gap is arranged between the rotating shaft and the tooth part.
Further, the large-scale scattered winding synchronous motor tooth yoke separation type counter-flow ventilation cooling system further comprises a second baffle plate, wherein the second baffle plate is arranged between the rotating shaft and the tooth part, and the second baffle plate is positioned at the left side and the right side of the air gap.
The beneficial effects of the invention are as follows:
1. according to the invention, independent radial ventilation grooves are respectively arranged on the yoke part and the tooth part of the stator core, and the yoke part and the tooth part are independently cooled, so that the traditional tooth yoke communication type cooling system is avoided, a cooling medium passing through the yoke part flows through the tooth part after being heated, the problem of poor heat dissipation of the tooth part is solved, the aim of reducing the temperature of the tooth part of the motor is realized, and the effect of reducing the radial temperature difference of the stator of the motor is further achieved;
2. the flow direction of the cooling medium is changed by adding the cooler and the partition plate, so that the flow directions of the cooling medium in the ventilation grooves of the yoke part and the tooth part are opposite to form countercurrent;
3. the stator winding adopts a scattered transposition structure in the ventilation ditch, so that the self-circulation of the stranded wires caused by uneven distribution of a leakage magnetic field in the stator slot can be effectively restrained; on the other hand, the direct contact between the single strand and the cooling medium is realized, and the effect of the winding strand in the ventilation groove is greatly improved;
4. the generator integrally adopts an axial double-way exhaust cooling structure, solves the problem of overlarge axial temperature difference in the traditional single-wind direction cooling mode, and achieves the effect of reducing the axial temperature difference;
5. by combining the points, the cooling structure provided by the invention can simultaneously realize direct reduction of the tooth temperature and the winding temperature, and greatly improves the cooling capacity of the large synchronous motor.
Drawings
FIG. 1 is a schematic cross-sectional view of the overall structure of the present invention;
FIG. 2 is an axial cross-sectional view of a portion of a stator core; the air path flow direction comprises a radial ventilation groove and an axial ventilation hole part;
FIG. 3 is an axial view and a radial view of the winding being fanned out in the vent channel;
fig. 4 is an axial cross-sectional view of a stator core, including radial ventilation channels and axial ventilation channel portions.
In the figure: 1-a stator core; 2-end structural members; 3-yoke; 3-1 yoke radial ventilation grooves; 3-2 yoke axial vents; 4-tooth; 4-1 tooth radial ventilation grooves; 4-2 tooth axial vent holes; 7-a baffle; 8-1 a first cooler; 8-2 a second cooler; 8-3 a third cooler; 9-rotor air inlet area; 10-1 multistage axial fan; 10-2 centrifugal fans; 11-a rotating shaft; 12-an air outlet area; 13-air gap; 14-stator windings; 15-a water pipe; 16-1-a first separator; 16-2 second separator; 17-channel; 18-generator two side ends; 19-a casing.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 4, and includes a stator core 1, an end structural member 2, a yoke 3, a tooth 4, a baffle 7, a rotating shaft 11 and a plurality of coolers, wherein the stator core 1 is sleeved on the rotating shaft 11, the stator core 1 is divided into the yoke 3 and the tooth 4 from outside to inside, the yoke 3 is provided with a plurality of yoke radial ventilation grooves 3-1, the two ends of the yoke 3 are provided with the end structural member 2, the yoke 3 and the end structural member 2 are uniformly provided with a plurality of yoke axial ventilation holes 3-2, the tooth 4 is provided with a plurality of tooth radial ventilation grooves 4-1, the tooth 4 is provided with a plurality of tooth axial ventilation holes 4-2, the baffle 7 is arranged between the yoke 3 and the tooth 4, a first cooler 8-1 is respectively arranged above and below the stator core 1, and the second cooler 8-2 and the third cooler 8-3 are respectively arranged at rotor air inlet areas 9 on the left and right sides of the rotating shaft 11.
The baffle 7 is arranged at the junction of the yoke part 3 and the tooth part 4 of the stator core 1, and separates the radial ventilation grooves of the yoke part 3 and the tooth part 4, so that the yoke part 3 and the tooth part 4 are independently cooled. The yoke part 3 and the tooth part 4 of the stator core 1 are both provided with axial vent holes, the vent hole radius on the yoke part 3 and the end structural part 2 is larger, and the vent hole radius of the tooth part 4 is smaller.
The second embodiment is as follows: the present embodiment is described with reference to fig. 1 and 3, and the large-sized discrete winding synchronous motor tooth-yoke separation type counter-flow ventilation cooling system according to the present embodiment further includes a stator winding 14 and a cooling water pipe 15, wherein the stator winding 14 is embedded in the tooth portion 4 of the stator core 1, and the cooling water pipe 15 is embedded in the stator winding 14.
The cooling water flows in from one end of the cooling water pipe 15 to directly cool the stator winding 14, and then flows out from the other end. The stator windings 14 are transposed in the radial ventilation grooves 4-1 of the teeth 4, wherein the upper layer windings 14-1 and the lower layer windings 14-2 are transposed once each time each radial ventilation groove 5-2 is met in the axial direction from left to right, each layer of windings gradually moves down one layer from top to bottom as shown in fig. 3, and the uppermost layer of windings moves to the first layer. The number m of radial ventilation grooves 5-2 arranged on the stator core 1 and the number q of strands of the stator winding 14 satisfy m/q=n, wherein n is an integer which is arbitrarily larger than 0. And when the winding is transposed, each strand is uniformly dispersed in the ventilation groove, and the cooling effect of the cooling medium in the radial ventilation groove on the winding is improved by increasing the contact area of the strand and the cooling medium.
Other components and connection relationships are the same as those of the first embodiment.
And a third specific embodiment: referring to fig. 1, in the present embodiment, the tooth-yoke separation type counter-flow ventilation cooling system for a large-sized bulk winding synchronous motor further includes a multistage axial fan 10-1 and a centrifugal fan 10-2, wherein one end of a rotating shaft 11 is provided with the multistage axial fan 10-1, and the other end of the rotating shaft 11 is provided with the centrifugal fan 10-2.
The rotating shaft 11 adopts a structure that a multistage axial fan 10-1 and a centrifugal fan 10-2 are connected in series. The multistage axial fan 10-1 is configured to draw out the cooling medium at both side ends 18 of the generator, and then to press the cooling medium into the air outlet area 12 by the pressurizing action of the centrifugal fan 10-2.
Other components are the same as those in the first or second embodiment in connection.
The specific embodiment IV is as follows: referring to fig. 1, in the present embodiment, the tooth-yoke separation type counter-current ventilation cooling system for a large-scale bulk winding synchronous motor further includes a first partition 16-1, an air outlet area 12 is disposed between the first partition 16-1 and an end portion of the stator core 1, a rotor air inlet area 9 is disposed between the first partition 16-1 and a casing 19, and a passage 17 is disposed between the air outlet area 12 and the rotor air inlet area 9 near the cooler 8-1.
The first partition plate 16-1 isolates the end of the stator core 1, the air outlet area 12 and the rotor air inlet area 9, wherein the air outlet area 12 and the rotor air inlet area 9 are provided with channels 17 near the first cooler 8-1, cooling medium in the air outlet area 12 is split, one part enters the cooler 8-1, and the other part enters the rotor air inlet area 9.
Other components are the same as those in the first, second or third embodiments in connection.
Fifth embodiment: the present embodiment will be described with reference to fig. 1, in which an air gap 13 is provided between the rotating shaft 11 and the tooth portion 4.
Cooling medium flows in from a first cooler 8-1 above the stator core 1 through a radial ventilation groove 3-1 at the yoke part of the stator core 1; the cooling medium in the radial ventilation grooves 4-1 of the teeth part of the stator core 1 flows in after entering the air gap 13 through the rotating shaft 11 by the cooling medium of the second cooler 8-2 and the third cooler 8-3, the yoke part 3 and the teeth part 4 are independently cooled, and the flow directions of the cooling medium are opposite, so that countercurrent is formed in the stator core 1.
Other components are the same as those in the first, second, third or fourth embodiments in connection.
Specific embodiment six: referring to fig. 1, the tooth yoke separation type counter-flow ventilation cooling system of the large-scale bulk winding synchronous motor according to the present embodiment further includes a second partition 16-2, wherein the second partition 16-2 is installed between the rotating shaft 11 and the tooth portion 4, and the second partition 16-2 is located at the left and right sides of the air gap 13.
The second separator 16-2 separates the air gap from the both side end portions 18, and prevents the cooling medium having a low temperature at the air gap 13 from flowing in a mixed manner with the cooling medium at the both side end portions 18 of the motor. A minute gap is left between the second spacer 16-2 and the rotation shaft 11 to prevent friction between the rotation shaft 11 and the second spacer 16-2 when the motor rotates.
Other components are the same as those in the first, second, third, fourth or fifth embodiments in connection.
Working principle:
as shown in figure 1 of the drawings in the specification, the end part of a stator core 1, an air outlet area 12 and a rotor air inlet area 9 are isolated by a partition plate, and a channel 17 is arranged at the air outlet area 12. At this time, the cooling in the air outlet area 12 is performed by two flow directions, one part of the cooling medium directly flows back to the cooler 8-1, and enters the stator core 1 again after being cooled by the cooler, the other part of the cooling medium enters the cooler 8-2 and the cooler 8-3 at the rotor air inlet area 9 at two sides of the rotating shaft 11, the part of the cooling medium enters the rotating shaft 11 through the rotor air inlet area 9 after being cooled, the rotating shaft 11 is cooled, and then enters the tooth part 4 of the stator core 1 through the air gap 13 in the radial direction, and the cooling medium flows in the radial ventilation groove 3-1 of the yoke part of the stator core and the radial ventilation groove 4-1 of the tooth part of the stator core in the opposite directions, so that countercurrent is formed. In order to prevent the mixed flow of the cooling medium in the air gap 13 and the cooling medium at the two side ends 18 of the generator, a second partition plate 16-2 is added at the air gap 13, the cooling medium which enters the radial ventilation grooves 4-1 of the tooth part in the radial direction flows to the two side ends of the generator together with the axial ventilation holes 3-2 of the yoke part 3, and the cooling medium is again participated in the cooling medium circulation under the pressure effect generated by the multistage fan 10.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (1)
1. The utility model provides a large-scale scattered winding synchronous motor tooth yoke disconnect-type counter-current ventilation cooling system which characterized in that: the stator iron core (1) is sleeved on the rotating shaft (11), the stator iron core (1) is divided into a yoke (3) and a tooth (4) from outside to inside, the yoke (3) is provided with a plurality of yoke radial ventilation grooves (3-1), two ends of the yoke (3) are provided with end structural members (2), a plurality of yoke axial ventilation holes (3-2) are uniformly distributed on the yoke (3) and the end structural members (2), the tooth (4) is provided with a plurality of tooth radial ventilation grooves (4-1), a plurality of tooth axial ventilation holes (4-2) are arranged on the tooth (4), the baffle (7) is arranged between the yoke (3) and the tooth (4), a first cooler (8-1) is arranged above and below the stator iron core (1), and a second cooler (8-2) and a third cooler (8-3) are respectively arranged at the left side and the right side of the rotor (9) of the rotating shaft (11); the large-scale scattered winding synchronous motor tooth yoke separation type counter-flow ventilation cooling system further comprises a stator winding (14) and a cooling water pipe (15), wherein the stator winding (14) is embedded in a tooth part (4) of a stator core (1), the cooling water pipe (15) is embedded in the stator winding (14), the stator winding (14) is transposed and uniformly dispersed in a tooth part radial ventilation groove (4-1), each layer of winding gradually moves down from top to bottom to form a layer, and the uppermost layer of winding moves to the first layer; the number m of the radial ventilation grooves (4-1) of the tooth parts and the number q of the strands of the stator winding (14) meet the condition that m/q=n, wherein n is an integer which is arbitrarily more than 0; the tooth yoke separation type counter-flow ventilation cooling system of the large-scale scattered winding synchronous motor further comprises a multi-stage axial flow fan (10-1) and a centrifugal fan (10-2), wherein the multi-stage axial flow fan (10-1) is arranged at one end of the rotating shaft (11), and the centrifugal fan (10-2) is arranged at the other end of the rotating shaft (11); the large-scale scattered winding synchronous motor tooth yoke separation type counter-flow ventilation cooling system further comprises a first partition plate (16-1), an air outlet area (12) is arranged between the first partition plate (16-1) and the end part of the stator core (1), a rotor air inlet area (9) is arranged between the first partition plate (16-1) and a shell (19), and a channel (17) is arranged at the position, close to the cooler (8-1), of the air outlet area (12) and the rotor air inlet area (9); an air gap (13) is arranged between the rotating shaft (11) and the tooth part (4); the large-scale scattered winding synchronous motor tooth yoke separation type counter-flow ventilation cooling system further comprises a second partition plate (16-2), wherein the second partition plate (16-2) is arranged between the rotating shaft (11) and the tooth part (4), and the second partition plate (16-2) is positioned at the left side and the right side of the air gap (13); cooling medium flows in from a first cooler (8-1) above the stator core (1) in a radial ventilation groove (3-1) at the yoke part of the stator core (1); the cooling medium in the radial ventilation grooves (4-1) of the teeth part of the stator core (1) flows in after entering the air gap (13) through the rotating shaft (11) by the cooling medium in the second cooler (8-2) and the third cooler (8-3), the yoke part (3) and the teeth part (4) are independently cooled, and the flow directions of the cooling medium are opposite, so that countercurrent flow is formed in the stator core (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211148481.1A CN115360838B (en) | 2022-09-21 | 2022-09-21 | Gear yoke separation type counter-flow ventilation cooling system of large-scale bulk winding synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211148481.1A CN115360838B (en) | 2022-09-21 | 2022-09-21 | Gear yoke separation type counter-flow ventilation cooling system of large-scale bulk winding synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115360838A CN115360838A (en) | 2022-11-18 |
| CN115360838B true CN115360838B (en) | 2023-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211148481.1A Active CN115360838B (en) | 2022-09-21 | 2022-09-21 | Gear yoke separation type counter-flow ventilation cooling system of large-scale bulk winding synchronous motor |
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| Country | Link |
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| CN (1) | CN115360838B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064635A (en) * | 2011-01-12 | 2011-05-18 | 哈尔滨理工大学 | Steam turbine generator provided with axial-radial ventilating and cooling system |
| CN105308832A (en) * | 2013-04-03 | 2016-02-03 | Lc动力公司 | Liquid cooled stator for high efficiency machine |
| CN113014038A (en) * | 2021-03-11 | 2021-06-22 | 哈尔滨理工大学 | Novel two-side multistage counter-flow type axial-radial ventilation cooling system of half-speed steam turbine generator |
| CN113346678A (en) * | 2021-06-09 | 2021-09-03 | 哈尔滨理工大学 | Hybrid excitation turbogenerator with multi-stage axial flow-centrifugal ventilation cooling system |
-
2022
- 2022-09-21 CN CN202211148481.1A patent/CN115360838B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064635A (en) * | 2011-01-12 | 2011-05-18 | 哈尔滨理工大学 | Steam turbine generator provided with axial-radial ventilating and cooling system |
| CN105308832A (en) * | 2013-04-03 | 2016-02-03 | Lc动力公司 | Liquid cooled stator for high efficiency machine |
| CN113014038A (en) * | 2021-03-11 | 2021-06-22 | 哈尔滨理工大学 | Novel two-side multistage counter-flow type axial-radial ventilation cooling system of half-speed steam turbine generator |
| CN113346678A (en) * | 2021-06-09 | 2021-09-03 | 哈尔滨理工大学 | Hybrid excitation turbogenerator with multi-stage axial flow-centrifugal ventilation cooling system |
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| Publication number | Publication date |
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| CN115360838A (en) | 2022-11-18 |
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