CN115360838A - Tooth yoke separation type counter-flow ventilation cooling system of large-scale scattered winding synchronous motor - Google Patents

Abstract

The teeth and yoke separated counterflow ventilation and cooling system of a large-scale scattered winding synchronous motor relates to a ventilation and cooling system of a large-scale turbogenerator. The stator core of the present invention is sleeved on the rotating shaft, and the stator core is divided into a yoke part and a tooth part from outside to inside, and a baffle plate is arranged between the yoke part and the tooth part. The yoke is provided with a plurality of yoke ventilation grooves, and end structural parts are provided at both ends of the yoke, and a plurality of axial ventilation holes of the yoke are evenly distributed on the yoke and the end structural parts, and the teeth are provided with There are multiple radial ventilation grooves on the teeth, and multiple axial ventilation holes on the teeth, and a first cooler, a second cooler and a third cooler above and below the stator core. They are respectively arranged at the rotor air inlet areas on the left and right sides of the rotating shaft. The stator windings are transposed and evenly spread out in the tooth ventilation slots. The invention can directly reduce the tooth temperature and the winding temperature at the same time, and greatly improves the cooling capacity of the large synchronous motor.

Description

Large-scale scattered winding synchronous motor tooth yoke separated counterflow ventilation cooling system

technical field

The invention relates to a ventilation and cooling system of a large steam turbine generator, in particular to a counterflow ventilation and cooling system of a tooth-yoke separation type of a synchronous motor with large scattered windings, and belongs to the technical field of electrical engineering.

Background technique

Large-scale synchronous generators have high capacity, large size, and high electrical density of the stator windings, which will generate a lot of heat in the stator core during operation. For traditional large synchronous motors, the radial ventilation cooling method in which the stator core is connected to the yoke is usually adopted. However, since the teeth and yoke of the stator core are in a connected state, the cooling medium first flows through the yoke, is heated by the yoke, and then flows to the teeth to cool the teeth, and the higher temperature of the yoke will cause a greater impact on the cooling medium The temperature rise makes the subsequent cooling effect on the teeth not good. In addition, due to the dense distribution of strands in the stator slot and the wrapped insulation have a greater impact on heat dissipation, and the contact area between the stator winding and the cooling medium in the ventilation ditch is small, the cooling medium cannot fully take away the heat generated by the stator winding.

Contents of the invention

In order to solve the problems of difficult heat dissipation of windings and easy overheating of teeth in traditional synchronous motor cooling methods, the present invention further provides a tooth-yoke-separated counterflow ventilation cooling system for large-scale scattered-winding synchronous motors.

The technical scheme that the present invention takes for solving the above problems is:

The invention includes a stator core, an end structure, a yoke, a tooth, a baffle, a rotating shaft and a plurality of coolers, the stator core is set on the rotating shaft, and the stator core is divided into a yoke and a tooth from the outside to the inside. The yoke is provided with a plurality of yoke ventilation grooves, end structural parts are provided at both ends of the yoke, a plurality of yoke axial ventilation holes are evenly distributed on the yoke and the end structural parts, and the teeth are provided with A plurality of teeth radial ventilation grooves, and a plurality of teeth axial ventilation holes are provided on the teeth, a baffle is provided between the yoke and the teeth, and a first cooling is provided above and below the stator core. The second cooler and the third cooler are respectively arranged at the rotor air intake area on the left and right sides of the rotating shaft.

Further, the tooth yoke separated counterflow ventilation cooling system for large-scale discrete winding synchronous motors also includes stator windings and cooling water pipes, the stator windings are embedded in the teeth of the stator core, and the cooling water pipes are embedded in the stator windings. The stator windings are transposed and evenly spread out in the radial ventilation grooves of the teeth. Each layer of windings gradually moves down one layer from top to bottom, and the uppermost layer of windings moves to the first layer. The number m of radial ventilation grooves of the teeth and the number q of stator winding strands satisfy m/q=n, where n is any integer greater than 0.

Further, the tooth yoke separation type counterflow ventilation and cooling system of the large-scale scattered winding synchronous motor also includes a multi-stage axial flow fan and a centrifugal fan, one end of the rotating shaft is provided with a multi-stage axial flow fan, and the other end of the rotating shaft is provided with a centrifugal fan .

Further, the tooth yoke separation type counterflow ventilation cooling system of large-scale scattered winding synchronous motor also includes a first partition, an air outlet area is set between the first partition and the end of the stator core, and the partition and the machine A rotor air inlet area is provided between the shells, and channels are provided near the cooler for the air outlet area and the rotor air inlet area.

Further, an air gap is provided between the rotating shaft and the tooth portion.

Further, the tooth yoke separation type counterflow ventilation cooling system for large-scale discrete winding synchronous motors also includes a second baffle installed between the rotating shaft and the teeth, and the second baffle is located on the left side of the air gap. , right sides.

The beneficial effects of the present invention are:

1. The present invention sets independent radial ventilation grooves on the yoke and teeth of the stator core, and independently cools the yoke and the teeth respectively, avoiding the traditional tooth yoke connected cooling system, and the cooling medium passing through the yoke After being heated, it flows through the teeth, which solves the problem of poor heat dissipation of the teeth, realizes the purpose of reducing the temperature of the motor teeth, and further reduces the radial temperature difference of the motor stator;

2. By adding a cooler and a partition, the flow direction of the cooling medium is changed, so that the flow direction of the cooling medium in the ventilation ditch of the yoke and the teeth is opposite, forming a countercurrent;

3. The stator winding of the present invention adopts a diffuse transposition structure in the ventilation ditch, which can effectively suppress the circulation of the strand itself caused by the uneven distribution of the leakage magnetic field in the stator slot; on the other hand, this realizes a single strand and cooling The direct contact of the medium greatly improves the effect of the winding strands in the ventilation trench;

4. The generator of the present invention adopts an axial double-channel exhaust air cooling structure as a whole, which solves the problem of excessive axial temperature difference in the traditional single-air direction cooling method, and achieves the effect of reducing the axial temperature difference;

5. Based on the above points, the cooling structure proposed by the present invention can directly reduce the temperature of the teeth and the winding at the same time, greatly improving the cooling capacity of the large synchronous motor.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the overall structure of the present invention;

Figure 2 is an axial cross-sectional view of part of the stator core; including the flow direction of the radial ventilation groove and the axial ventilation hole;

Figure 3 is an axial view and a radial view of the diffuse transposition of the winding in the ventilation ditch;

Fig. 4 is an axial cross-sectional view of the stator core, including the air flow direction of the radial ventilation groove and the axial ventilation hole.

In the figure: 1-stator core; 2-end structure; 3-yoke; 3-1 yoke ventilation ditch; 3-2 yoke ventilation hole; 4-tooth; 4-1 tooth ventilation ditch; 4 -2 tooth vent; 7- baffle; 8-1 first cooler; 8-2 second cooler; 8-3 third cooler; 9- rotor air intake area; 10-1 multi-stage axial flow Fan; 10-2 centrifugal fan; 11-rotating shaft; 12-outlet area; 13-air gap; 14-stator winding; 15-water pipe; 16-first partition; 16-1 second partition; 17-channel ; 18-ends on both sides of the generator; 19-casing.

Detailed ways

Specific Embodiment 1: This embodiment is described with reference to FIGS. 1 to 4. This embodiment includes a stator core 1, an end structure 2, a yoke 3, a tooth 4, a baffle 7, a rotating shaft 11 and a plurality of cooling The stator core 1 is set on the rotating shaft 11. The stator core 1 is divided into a yoke part 3 and a tooth part 4 from the outside to the inside. The yoke part 3 is provided with a plurality of yoke part ventilation grooves 3-1. There are end structural parts 2 at both ends, a plurality of yoke axial ventilation holes 3-2 are evenly distributed on the yoke part 3 and the end structural part 2, and a plurality of tooth radial ventilation grooves 4 are provided on the tooth part 4 -1, and the tooth part 4 is provided with a plurality of tooth part axial ventilation holes 4-2, a baffle plate 7 is provided between the yoke part 3 and the tooth part 4, and a first part is provided above and below the stator core 1 A cooler 8-1, a second cooler 8-2 and a third cooler 8-3 are respectively arranged at the rotor air intake area 9 on the left and right sides of the rotating shaft 11.

The baffle plate 7 is placed at the junction of the yoke 3 and the tooth 4 of the stator core 1, and separates the radial ventilation grooves of the yoke 3 and the tooth 4, so that the yoke 3 and the tooth 4 are cooled independently. Both the yoke 3 and the tooth 4 of the stator core 1 are provided with axial ventilation holes, the radii of the ventilation holes on the yoke 3 and the end structural member 2 are relatively large, and the radius of the ventilation holes on the tooth 4 is small.

Specific Embodiment 2: This embodiment is described with reference to FIG. 1 and FIG. 3 . The gear-yoke separation type counterflow ventilation and cooling system of a large-scale scattered-winding synchronous motor described in this embodiment also includes a stator winding 14 and a cooling water pipe 15. The stator winding 14 is embedded Installed in the tooth part 4 of the stator core 1, the cooling water pipe 15 is embedded in the stator winding 14.

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 winding 14 is transposed in the radial ventilation groove 5-2 of the tooth part 4, wherein the upper layer winding 14-1 and the lower layer winding 14-2 respectively meet a radial ventilation groove 5-2 from left to right in the axial direction. 2 Carry out a transposition, as shown in Figure 3, each layer of winding gradually moves down one layer from top to bottom, and the uppermost layer of winding moves to the first layer. The number m of the radial ventilation grooves 5-2 on the stator core 1 and the number q of the 14 strands of the stator winding satisfy m/q=n, where n is any integer greater than 0. At the same time as the winding is transposed, each strand is evenly spread out in the ventilation groove, and the cooling effect of the cooling medium on the winding in the radial ventilation groove is improved by increasing the contact area between the strand and the cooling medium.

Other components and connections are the same as those in the first embodiment.

Specific Embodiment 3: This embodiment is described with reference to FIG. 1 . The gear-yoke separation type counterflow ventilation and cooling system of a large-scale scattered winding synchronous motor in this embodiment also includes a multi-stage axial flow fan 10-1 and a centrifugal fan 10-2. One end of the rotating shaft 11 is provided with a multi-stage axial flow fan 10-1, and the other end of the rotating shaft 11 is provided with a centrifugal fan 10-2.

The rotating shaft 11 adopts a structure in which a multi-stage axial flow fan 10-1 and a centrifugal fan 10-2 are connected in series. The function of the multi-stage axial flow fan 10-1 is to extract the cooling medium located at the ends 18 on both sides of the generator, and then press the cooling medium into the air outlet area 12 through the pressurization of the centrifugal fan 10-2.

The other components are the same as those in Embodiment 1 or 2 in terms of connections.

Specific Embodiment 4: This embodiment is described with reference to FIG. 1. The large-scale scattered winding synchronous motor tooth yoke separation type counterflow ventilation and cooling system in this embodiment also includes a first partition 16-1, a first partition 16-1 There is an air outlet area 12 between the end of the stator core 1, and a rotor air inlet area 9 between the partition 16-1 and the casing 19. The air outlet area 12 and the rotor air inlet area 9 are close to the cooler. Channel 17 is provided at 8-1.

The 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 arranged near the first cooler 8-1. The channel 17 is located in the air outlet area 12 where the cooling medium is divided, and part of it enters the cooler 8 - 1 , and the other part enters the rotor air inlet area 9 .

The other components are the same as those in Embodiment 1, 2 or 3 in connection relationship.

Embodiment 5: This embodiment is described with reference to FIG. 1 . In this embodiment, an air gap 13 is provided between the rotating shaft 11 and the tooth portion 4 .

The cooling medium in the stator core 1 yoke part 3 radial ventilation groove 3-1 flows in from the first cooler 8-1 above the stator core 1; the cooling medium in the stator core 1 tooth part 4 radial ventilation groove 4-1 The cooling medium from the second cooler 8-2 and the third cooler 8-3 flows into the air gap 13 through the rotating shaft 1, the yoke 3 and the teeth 4 are independently cooled and the cooling medium flows in the opposite direction, and the stator core 1 A countercurrent is formed.

Other components are the same as those in Embodiment 1, 2, 3 or 4 in terms of connections.

Specific Embodiment 6: This embodiment is described in conjunction with FIG. 1. The large-scale scattered winding synchronous motor tooth yoke separation type counterflow ventilation and cooling system in this embodiment also includes a second partition 16-2, and a second partition 16-2 Installed between the rotating shaft 11 and the gear part 4 , and the second separator 16 - 2 is located on the left and right sides of the air gap 13 .

The air gap and the ends 18 on both sides are separated by the second separator 16 - 2 , preventing the cooling medium with a lower temperature in the air gap 13 from mixing with the cooling medium located at the ends 18 on both sides of the motor. There is a small gap between the partition plate 16-2 and the rotating shaft 11 to prevent friction between the rotating shaft 11 and the partition plate 16-2 when the motor rotates.

The other components are the same as those in Embodiment 1, 2, 3, 4 or 5 in terms of connections.

working principle:

As shown in Figure 1 of the accompanying drawings, the present invention isolates the end of the stator core 1, the air outlet area 12, and the rotor air inlet area 9 through a partition 16, and a passage 17 is provided at the air outlet area 12. At this time, the cooling in the air outlet area 12 flows in two directions, a part of the cooling medium directly flows back to the cooler 8-1, and then enters the stator core 1 again after being cooled by the cooler, and the other part of the cooling medium enters the stator core 1 located in the shaft rotor. The cooler 8-2 and the cooler 8-3 at the rotor air intake area 9 on both sides of the 11, this part of the cooling medium enters the rotating shaft 11 through the rotor air intake area 9 after being cooled, and then cools the rotating shaft 11 along the radial direction. Entering the tooth part 4 of the stator core 1 through the air gap 13, the cooling medium in the radial ventilation groove 3-1 of the stator core yoke part 3 and the radial ventilation groove 4-1 of the stator core tooth part 4 flow in the opposite direction, forming a reverse flow. In order to prevent the cooling medium in the air gap 13 from mixing with the cooling medium at the ends 18 on both sides of the generator, a second partition 16-2 is added at the air gap 13, and enters the radial ventilation groove 4 of the tooth part 4 along the radial direction. The cooling medium of -1 flows to the axial ventilation holes 3-2 of the yoke 3 to both ends of the generator, and participates in the circulation of the cooling medium again under the pressure generated by the multi-stage fan 10 .

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but as long as they do not depart from the content of the technical solution of the present invention, according to the present invention Within the spirit and principles of the present invention, any simple modifications, equivalent replacements and improvements made to the above embodiments still fall within the protection scope of the technical solutions of the present invention.

Claims (6)

1. Large-scale scattered winding synchronous motor teeth and yoke separated counterflow ventilation cooling system, characterized in that it includes stator core (1), end structural parts (2), yoke (3), teeth (4) , a baffle (7), a rotating shaft (11) and multiple coolers, the stator core (1) is set on the rotating shaft (11), and the stator core (1) is divided into a yoke (3) and a tooth ( 4), the yoke (3) is provided with a plurality of yoke ventilation grooves (3-1), the two ends of the yoke (3) are provided with end structural members (2), and the yoke (3) and A plurality of yoke axial ventilation holes (3-2) are evenly distributed on the end structural member (2), and a plurality of tooth radial ventilation grooves (4-1) are arranged on the tooth portion (4), and the tooth portion ( 4) There are a plurality of teeth axial ventilation holes (4-2), a baffle (7) is provided between the yoke (3) and the teeth (4), and the upper and lower sides of the stator core (1) Each is provided with a first cooler (8-1), a second cooler (8-2) and a third cooler (8-3) are respectively arranged in the rotor air intake area on the left and right sides of the rotating shaft (11) (9). 2. The tooth-yoke separated counterflow ventilation cooling system for a large-scale discrete winding synchronous motor according to claim 1, characterized in that: the large-scale discrete winding synchronous motor tooth-yoke separation counterflow ventilation cooling system also includes a stator winding (14) and cooling water pipe (15), the stator winding (14) is embedded in the stator core (1) teeth (4), the cooling water pipe (15) is embedded in the stator winding (14), the stator winding (14 ) in the tooth radial ventilation ditch (4-1) and spread out evenly, each layer of windings gradually moves down one layer from top to bottom, and the uppermost winding moves to the first layer; the tooth radial ventilation ditch (4-1) The number m and the number q of stator winding (14) strands satisfy m/q=n, wherein n is any integer greater than 0. 3. The tooth-yoke separated counterflow ventilation cooling system for a large-scale discrete winding synchronous motor according to claim 1, characterized in that: the large-scale discrete winding synchronous motor tooth-yoke separation counterflow ventilation cooling system also includes a multi-stage Axial flow fan (10-1) and centrifugal fan (10-2), one end of rotating shaft (11) is provided with multistage axial flow fan (10-1), and the other end of rotating shaft (11) is provided with centrifugal fan (10- 2). 4. The tooth-yoke separation type counterflow ventilation cooling system for large-scale discrete winding synchronous motors according to claim 1, characterized in that: the large-scale discrete winding synchronous motor tooth-yoke separation type counterflow ventilation cooling system also includes a first A partition (16-1), an air outlet area (12) is provided between the first partition (16-1) and the end of the stator core (1), and the partition (16-1) and the casing (19 ) is provided with a rotor air inlet area (9), and the air outlet area (12) and the rotor air inlet area (9) are provided with passages (17) near the cooler (8-1). 5. According to claim 1, the tooth yoke separation type counterflow ventilation and cooling system of a large-scale scattered winding synchronous motor is characterized in that: an air gap (13) is provided between the rotating shaft (11) and the tooth portion (4) . 6. The tooth-yoke separated counterflow ventilation cooling system for a large-scale discrete winding synchronous motor according to claim 5, characterized in that: the large-scale discrete winding synchronous motor tooth-yoke separation counterflow ventilation cooling system also includes a second The partition (16-2), the second partition (16-2) is installed between the rotating shaft (11) and the tooth (4), and the second partition (16-2) is located on the left side of the air gap (13) , right sides.

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