A radial multi-parallel air path internal cooling pumped storage generator motor rotor

Abstract

The present invention discloses a radial multi-parallel air path internal cooling pumped storage power generation motor rotor, which relates to the field of motors. The present invention is to solve the problem of serious heating in the rotor area of ​​existing pumped storage power generation motors. The rotor yoke and the rotor pole body have n sections along the axial direction, and n-1 sections of yoke radial ventilation ducts are formed between each section of the rotor yoke, and n-1 sections of rotor pole body radial ventilation grooves are formed between each section of the rotor pole body. The ventilation channel steel is installed in the yoke radial ventilation duct and the rotor pole body radial ventilation groove. Each section of the rotor yoke is provided with a yoke gradually widening ventilation duct along the circumferential and axial directions, and the rotor winding is provided with rectangular ventilation holes along the axial direction. The rectangular ventilation holes correspond to the positions of the n-1 sections of rotor pole body radial ventilation grooves in the axial direction. A rotor insulation plate is installed between the rotor winding and the rotor pole body and the rotor pressure plate, and a V-shaped fan is installed at the ends of both sides of the rotor yoke. The present invention enhances the cooling effect of the rotor area, effectively reduces the rotor temperature, and is easy to implement.

Description

Technical field:

[0001] The invention relates to a radial multi-parallel air path inner-cooling pumped storage power generation motor rotor, belonging to the field of motors. Background technology:

[0002] Hydropower is one of the cleanest ways of generating electricity. Pumped-storage generator motors, as the core equipment in the entire hydropower system, play a vital role. With the rapid development of hydropower technology, the single-unit capacity of large-scale pumped-storage generator motors continues to increase, and the efficiency and material utilization rate of generator motors continue to improve. However, as the single-unit capacity of pumped-storage generator motors increases, the electromagnetic load and temperature rise problems of generator motors are also increasingly aggravated, resulting in a significant increase in the electromagnetic loss of the generator motor and a significant increase in temperature. This seriously affects the safe operation and service life of large-scale pumped-storage generator motors, and poses a hidden danger to the reliable power supply for people's living needs.

[0003] In order to improve the reliability of large pumped-storage generator motors and reduce the temperature of the rotor windings, rotor insulation plates, rotor pole shoes, damping bars and rotor pole bodies in the pumped-storage generator motors, a radial multi-parallel air path internal cooling pumped-storage generator motor rotor can be used, which effectively increases the total fluid flow in the generator motor, significantly increases the contact area between the cooling gas in the generator motor and the rotor windings, rotor insulation plates, rotor pole shoes, damping bars and rotor pole bodies, improves the utilization rate of the cooling gas, and effectively reduces the temperature of various components in the rotor area of ​​the pumped-storage generator motor. Summary of the invention:

[0004] The purpose of the present invention is to provide a radial multi-parallel air path internally cooled pumped storage generator motor rotor to solve the problem of excessive temperature of the rotor windings and rotor insulation plates of traditional pumped storage generator motors, improve the flow rate and utilization rate of the cooling gas in the generator motor, accelerate the flow rate of the cooling gas in the pumped storage generator motor, effectively reduce the temperature of the various rotor components in the generator motor, and enhance the ability of the pumped storage generator motor to operate safely and stably.

[0005] The present invention discloses a radial multi-parallel air path internal cooling pumped storage power generation motor rotor, which includes a rotor yoke, a yoke gradually widening ventilation duct, a V-shaped fan, a rotor pole shoe, a rotor pole body, ventilation channel steel, a rotor winding, a rotor insulating plate, a yoke radial ventilation duct, a rotor pole body radial ventilation groove, a rotor pressure plate, a support plate, a damping strip, a rotor slot wedge, a rectangular ventilation hole and a yoke axial ventilation hole. The rotor yoke and the rotor pole body have n sections along the axial direction, n-1 sections of yoke radial ventilation duct are formed between each section of the rotor yoke, and n-1 sections of rotor pole body radial ventilation groove are formed between each section of the rotor pole body. The ventilation channel steel is installed in the yoke radial ventilation duct and the rotor pole body radial ventilation groove. Each section of the rotor yoke is provided with a yoke gradually widening ventilation duct along the circumferential direction and the axial direction. The rotor winding is provided with a rectangular ventilation hole along the axial direction. The rectangular ventilation hole corresponds to the position of the n-1 sections of the rotor pole body radial ventilation groove in the axial direction. A rotor insulating plate is installed between the rotor winding, the rotor pole body and the rotor pressure plate. The V-shaped fan is installed at the two side ends of the rotor yoke.

[0006] The number of rotor yoke segments n is 3 to 7; the length of the rectangular ventilation hole entrance is 10 mm to 20 mm; the width of the rectangular ventilation hole entrance is 5 mm to 10 mm; the width of the radial ventilation groove of the rotor pole body is 6 mm to 20 mm; the outlet length of the yoke gradually widening ventilation duct at the outer diameter is 280 mm to 320 mm; the entrance length of the yoke gradually widening ventilation duct at the inner diameter is 200 mm to 240 mm; the width of the yoke gradually widening ventilation duct 2 is 5 mm to 15 mm; the angle a between the two blades of the V-shaped fan 3 is 30° to 50°.

[0007] Preferably, the two blades of the V-shaped fan are not connected, which further increases the flow rate of cooling gas in the end area of ​​the pumped storage generator motor and further reduces the temperature of the rotor winding end.

[0008] Preferably, the distance between adjacent rotor windings in the circumferential direction is increased, thereby increasing the gas flow between the rotor windings and further reducing the temperature of the rotor windings.

[0009] Preferably, an axial ventilation hole is provided at the end of the rotor yoke, which increases the contact area between the cooling gas and the end of the rotor yoke and further reduces the temperature of the end of the rotor yoke.

[0010] The advantages of the present invention are as follows: the temperature of the rotor winding and the rotor insulation plate of the large-capacity pumped-storage power generation motor is relatively high, and the utilization rate of the cooling gas in the rotor area is also relatively low, which makes it impossible to effectively utilize the limited space in the rotor area to generate a larger gas flow. The present invention provides a yoke with gradually widened ventilation ducts in the circumferential and axial directions in the solid rotor yoke of the original pumped-storage power generation motor, n-1 sections of rotor pole body radial ventilation grooves are provided in the rotor pole shoes and the rotor pole body, the n-1 sections of rotor pole body radial ventilation grooves are connected to the n-1 sections of rotor yoke radial ventilation ducts, ventilation channel steels are installed in the n-1 sections of yoke radial ventilation ducts and the n-1 sections of rotor pole body radial ventilation grooves, the original solid rotor winding is provided with rectangular ventilation holes in the axial direction, and V-shaped fans are newly provided at both ends of the rotor yoke, forming a radial multi-parallel air path internal cooling pumped-storage power generation motor rotor. The V-shaped fan drives the flow of cooling air within the pumped-storage generator motor's end regions, effectively removing heat from the rotor winding ends, stator core ends, stator winding ends, and various stator end components. Cooling air flowing through the radial ventilation grooves in the rotor pole body and the rectangular ventilation holes within the rotor winding effectively removes heat from the rotor pole shoes, rotor pole body, damping bars, and rotor windings, significantly reducing the temperatures of these rotor pole shoes, rotor pole body, damping bars, and rotor windings. The ventilation channels within the rotor region further increase the flow rate of cooling air within the pumped-storage generator motor, accelerating the flow rate of the cooling air. The radial multi-parallel air path internally cooled pumped-storage generator motor rotor described in this patent effectively enhances the cooling effect within the rotor region, increases the fluid flow rate and cooling air utilization within the pumped-storage generator motor, significantly reduces the temperature of various components within the rotor region, effectively reduces the temperature difference and thermal stress along the axial direction of the generator motor, and enhances the pumped-storage generator motor's ability to operate safely and reliably over the long term. Description of the drawings:

[0011] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and accompanying drawings.

[0012] Figure 1 This is a three-dimensional diagram of the rotor of a radial multi-parallel air path internally cooled pumped storage generator motor according to the present invention;

[0013] Figure 2 This is a partial enlarged view of the rotor magnetic pole portion (position ①) of a radial multi-parallel air path internally cooled pumped storage generator motor according to the present invention;

[0014] Figure 3 This is a partial enlarged view of the rotor yoke portion (at position ②) of a radial multi-parallel air path internally cooled pumped storage generator motor according to the present invention;

[0015] Figure 4This is a top view of the rotor of a radial multi-parallel air path internally cooled pumped storage generator motor according to the present invention;

[0016] Figure 5 This is a side view of the rotor of a radial multi-parallel air path internally cooled pumped storage generator motor according to the present invention;

[0017] Figure 6 This is a cross-sectional view of the rotor MM of a radial multi-parallel air path internally cooled pumped storage generator motor according to the present invention;

[0018] Figure 7 A top view of a rotor yoke of a radial multi-parallel air path internally cooled pumped storage generator motor according to a second specific embodiment of the present invention;

[0019] Figure 8 A top view of a radial multi-parallel air path internally cooled pumped storage generator motor rotor according to a third embodiment of the present invention;

[0020] Figure 9 This is a partial enlarged view of a rotor yoke and a V-shaped fan of a radial multi-parallel air path internally cooled pumped storage generator motor according to a fourth embodiment of the present invention;

[0021] In the diagram: 1 - rotor yoke, 2 - yoke progressively wider ventilation duct, 3 - V-shaped fan, 4 - rotor pole shoe, 5 - rotor pole body, 6 - ventilation channel steel, 7 - rotor winding, 8 - rotor insulation plate, 9 - yoke radial ventilation duct, 10 - rotor pole body radial ventilation groove, 11 - rotor pressure plate, 12 - support plate, 13 - damping strip, 14 - rotor slot wedge, 15 - rectangular ventilation hole, and 16 - yoke axial ventilation hole. The arrows in the diagram indicate the flow direction of cooling air within the rotor of a radial multi-parallel air path internally cooled pumped storage generator motor. Specific implementation method:

[0022] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is described below using specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely illustrative and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present invention.

[0023] Specific implementation method one: Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6This embodiment describes the present invention, which includes a rotor yoke 1, a yoke gradually widened ventilation duct 2, a V-shaped fan 3, a rotor pole shoe 4, a rotor pole body 5, a ventilation channel steel 6, a rotor winding 7, a rotor insulating plate 8, a yoke radial ventilation duct 9, a rotor pole body radial ventilation groove 10, a rotor pressure plate 11, a support plate 12, a damping strip 13, a rotor slot wedge 14, a rectangular ventilation hole 15 and a yoke axial ventilation hole 16. The number of axial sections of the rotor yoke 1 and the rotor pole body 5 is n, n-1 sections of yoke radial ventilation ducts 9 are formed between each section of the rotor yoke 1, and n-1 sections of rotor pole body radial ventilation grooves 10 are formed between each section of the rotor pole body 5. The ventilation channel steel 6 is installed in the yoke radial ventilation duct 9 and the rotor pole body radial ventilation groove 10. Each section of the rotor yoke 1 is provided with a yoke gradually widening ventilation duct 2 along the circumferential and axial directions, and the rotor winding 7 is provided with a rectangular ventilation hole 15 along the axial direction. The rectangular ventilation hole 15 corresponds to the position of the n-1 sections of the rotor pole body radial ventilation grooves 10 in the axial direction. A rotor insulating plate 8 is installed between the rotor winding 7 and the rotor pole body 5 and the rotor pressure plate 11, and a V-shaped fan 3 is installed at both side ends of the rotor yoke 1.

[0024] The number n of sections of the rotor yoke 1 is 3 to 7, and 5 sections are taken in this embodiment; the inlet length of the rectangular ventilation hole 15 is 10mm to 20mm, and 15mm is taken in this embodiment; the inlet width of the rectangular ventilation hole 15 is 5mm to 10mm, and 6mm is taken in this embodiment; the width of the radial ventilation groove 10 of the rotor pole body is 6mm to 20mm, and 10mm is taken in this embodiment; the outlet length of the yoke gradually widening ventilation duct 2 at the outer diameter is 280mm to 320mm, and 300mm is taken in this embodiment; the inlet length of the yoke gradually widening ventilation duct 2 at the inner diameter is 200mm to 240mm, and 220mm is taken in this embodiment; the width of the yoke gradually widening ventilation duct 2 is 5mm to 15mm, and 7mm is taken in this embodiment; the angle a between the two blades of the V-shaped fan 3 is 30° to 50°, and 40° is taken in this embodiment.

[0025] A yoke gradually widened ventilation duct 2 is provided in the circumferential and axial directions in the solid rotor yoke 1 of the original pumped-storage power generation motor, and n-1 rotor pole body radial ventilation grooves 10 are provided in the rotor pole shoes 4 and the rotor pole body 5. The n-1 rotor pole body radial ventilation grooves 10 are connected to the n-1 rotor yoke radial ventilation ducts 9. Ventilation channel steels 6 are installed in the n-1 yoke radial ventilation ducts 9 and the n-1 rotor pole body radial ventilation grooves 10. The original solid rotor winding is provided with rectangular ventilation holes 15 along the axial direction. The rectangular ventilation holes 15 correspond to the positions of the n-1 rotor pole body radial ventilation grooves in the axial direction. V-shaped fans 3 are newly provided at both ends of the rotor yoke 1, forming a radial multi-parallel air path internally cooled pumped-storage power generation motor rotor. Whether the pumped storage power generation motor is in generator operation (clockwise rotation) or motor operation (counterclockwise rotation), one path of cooling gas, driven by the V-shaped fan 3, can effectively increase the flow rate of cooling gas in the end area of ​​the pumped storage power generation motor, and accelerate the flow rate of cooling gas in the end area. This part of gas first effectively takes away the heat from the end of the rotor winding 7, significantly reduces the temperature of the end of the rotor winding 7, and then enters the stator end area, further reducing the temperature of the stator winding end, stator end component and stator end core in the stator end area; the other path of cooling gas flows radially through the gradually widening ventilation duct 2 of the magnetic yoke and enters the fluid area between the rotor windings 7, accelerates the fluid velocity around the rotor winding 7, increases the surface heat dissipation coefficient of the rotor winding 7, and effectively reduces the temperature of the rotor winding 7. This path of cooling gas passes through the air gap between the stator and rotor cores and enters the stator area, effectively taking away the heat from the stator core and the stator winding, and further reduces the temperature of the stator core and the stator winding. ; There is also a path of cooling gas flowing radially through the yoke radial ventilation channels 9 between each section of the rotor yoke 1 and into the radial ventilation grooves 10 of the rotor pole body. Part of the cooling gas passes through the rotor insulating plate 8 under the action of the rotor rotation and enters the rectangular ventilation holes 15 in the straight section area of ​​the rotor winding 7, effectively reducing the temperature of the rotor insulating plate 8. The rectangular ventilation holes 15 in the rotor winding 7 can effectively increase the contact area and surface heat dissipation coefficient between the cooling gas and the rotor winding 7, effectively reducing the temperature of the rotor winding 7. The cooling gas coming out of the rectangular ventilation holes 15 merges with the gas between the rotor winding 7 and then enters the stator straight section area through the air gap between the stator and rotor cores. The other part of the cooling gas cools the rotor pole body 5, rotor pole shoe 4 and damping bar 13 and then flows out from the outlet of the rotor pole body radial ventilation grooves 10. This part of the cooling gas can significantly accelerate the gas speed around the rotor pole body 5, rotor pole shoe 4 and damping bar 13, further reducing the temperature of the rotor pole body 5, rotor pole shoe 4 and damping bar 13. The ventilation channel steel 6 in the radial ventilation duct 9 of the yoke and the radial ventilation groove 10 of the rotor pole body can further increase the flow rate of the cooling gas, accelerate the flow rate of the cooling gas in the pumped storage generator motor, and improve the ability of the cooling gas to remove heat from the rotor area.The gradually widened yoke ventilation duct 2, the yoke radial ventilation duct 9 and the rotor pole body radial ventilation groove 10 can ensure that the air volume of the cooling gas in the straight section area of ​​the pumped storage generator motor rotor is more evenly distributed in the axial direction, reducing the temperature difference and thermal stress of the rotor yoke 1, the rotor pole body 5 and the rotor pole shoe 4 in the axial direction. At the same time, the cooling gas evenly distributed in the axial direction enters the stator area, which can also further reduce the temperature difference and thermal stress of the stator core and the stator winding in the axial direction.

[0026] Specific implementation method 2: Combination Figure 7 This embodiment differs from the first embodiment in that the two blades of the V-shaped fan 3 are not connected, further increasing the flow rate of cooling gas in the end region of the pumped-storage generator motor and further reducing the temperature at the end of the rotor winding 7. The remaining components and connections are the same as those in the first embodiment.

[0027] Specific implementation method three: Combination Figure 8 This embodiment differs from the first embodiment in that the circumferential distance between adjacent rotor windings 7 is increased, thereby increasing the gas flow between the rotor windings 7 and further reducing the temperature of the rotor windings 7. The other components and connections are the same as those of the first embodiment.

[0028] Specific implementation method four: Combination Figure 9 This embodiment differs from the first embodiment in that an axial vent hole 16 is provided at the end of the rotor yoke 1. This increases the contact area between the cooling gas and the end of the rotor yoke 1, further reducing the temperature at the end of the rotor yoke 1. The remaining components and connections are the same as those of the first embodiment.

[0029] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A radial multi-parallel air path internally cooled pumped storage generator motor rotor, characterized in that: It comprises a rotor yoke (1), a yoke gradually widened ventilation duct (2), a V-shaped fan (3), a rotor pole shoe (4), a rotor pole body (5), a ventilation channel steel (6), a rotor winding (7), a rotor insulating plate (8), a yoke radial ventilation duct (9), a rotor pole body radial ventilation groove (10), a rotor pressure plate (11), a support plate (12), a damping strip (13), a rotor slot wedge (14), a rectangular ventilation hole (15) and a yoke axial ventilation hole (16). The number of axial sections of the rotor yoke (1) and the rotor pole body (5) is n, and n-1 sections of yoke radial ventilation duct (9) are formed between each section of the rotor yoke (1), and n-1 sections of rotor pole body radial ventilation groove (10) are formed between each section of the rotor pole body (5). The ventilation channel steel (6) is installed in the radial ventilation duct (9) of the yoke and the radial ventilation groove (10) of the rotor pole body. Each section of the rotor yoke (1) is provided with a yoke gradually widening ventilation duct (2) along the circumferential direction and the axial direction. The rotor winding (7) is provided with a rectangular ventilation hole (15) along the axial direction. The rectangular ventilation hole (15) corresponds to the position of the n-1 radial ventilation groove (10) of the rotor pole body in the axial direction. A rotor insulation plate (8) is installed between the rotor winding (7) and the rotor pole body (5) and the rotor pressure plate (11). A V-shaped fan (3) is installed at the two side ends of the rotor yoke (1); the two blades of the V-shaped fan (3) are not connected; and the end of the rotor yoke (1) is provided with a yoke axial ventilation hole (16).

2. The radial multi-parallel air path internally cooled pumped storage generator motor rotor according to claim 1, characterized in that: The number n of segments of the rotor yoke (1) is 3 to 7; the inlet length of the rectangular ventilation hole (15) is 10 mm to 20 mm; the inlet width of the rectangular ventilation hole (15) is 5 mm to 10 mm; the width of the radial ventilation groove (10) of the rotor pole body is 6 mm to 20 mm; the outlet length of the yoke gradually widening ventilation duct (2) at the outer diameter is 280 mm to 320 mm; the inlet length of the yoke gradually widening ventilation duct (2) at the inner diameter is 200 mm to 240 mm; the width of the yoke gradually widening ventilation duct (2) is 5 mm to 15 mm; and the angle a between the two blades of the V-shaped fan (3) is 30° to 50°.

3. The radial multi-parallel air path internally cooled pumped storage generator motor rotor according to claim 1, characterized in that: The distance between adjacent rotor windings (7) in the circumferential direction increases.

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