Stator end wind shielding structure of high-speed pumped storage generator motor

Abstract

The utility model discloses a high-speed pumped storage generator motor stator end wind shielding structure which is composed of an air cover, a sealing ring, an insulating back plate, an insulating sealing plate, a first polyester glass rope, a second polyester glass rope, a third polyester glass rope, a fourth polyester glass rope, a thin polyester felt and a thick polyester felt. According to the utility model, the wind shielding height of the end part of the stator core is increased in the vertical direction; and meanwhile, the trapezoidal bulges on the sealing strips enable the sealing and attaching effects of the rubber on the outer circle side of the air inducing plate and the sealing strips to be better. The deviation of the induced draft plate in the machining stage and the installation process can be controlled within the two-section elastic connection adjusting range. The air quantity generated by high-speed rotation of the rotor is all deflected to the central line side of the stator and the rotor along the upper and lower air inducing plates and passes through a stator iron core ventilating duct due to the sealing performance of the end part, heat loss generated by unit operation is transferred into an air cooler, air flows according to a specified channel, turbulent flow and reverse flow are not generated, and the air cooling heat exchange efficiency of the unit is directly improved; and unit operation parameters are effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of high-speed pumped storage power generation motors, in particular to a wind shielding structure at the end of a stator of a high-speed pumped storage power generation motor. Background Art

[0002] High-speed pumped-storage hydroelectric generator motors play a vital role in power system phase and frequency modulation, valley shifting and peak shaving, and emergency standby. They play a crucial role in strengthening power system stability and improving its economic efficiency. With the increase in pumped-storage generator motor capacity and the rise in stator bar voltage, the air cooling requirements for pumped-storage units are becoming more stringent. Existing high-speed pumped-storage units typically incorporate fixed fans at both ends of the rotor yoke, leveraging their high rotational speed to accelerate air flow. The addition of fans increases the relative height between the rotor and stator, necessitating the installation of upper and lower draft plates to isolate the reverse flow of air. The inner circumference of the upper and lower draft plates encloses the rotating fans, which extend above the stator core, while the outer circumference smoothly transitions toward the stator and rotor centerlines. Due to manufacturing limitations of the upper and lower draft plates, they cannot be offset far enough toward the stator and rotor centerlines within their limited radial dimensions. Therefore, windshields are required at the ends of the stator core to close the vertical gap between the stator core ends and the outer circumference of the upper and lower draft plates. Therefore, it is urgent to develop a high-speed pumped storage generator motor stator end wind shield structure with simple processing technology and convenient installation. Summary of the Invention

[0003] In view of this, it is urgent to provide a stator end windshield structure that can resist the high wind pressure generated by the high-speed rotation of the unit and ensure the safe operation of the high-speed pumped storage generator set. The technical solution of the utility model is: it consists of an air cover, a sealing ring, an insulating back plate, an insulating sealing plate, a first polyester glass rope, a second polyester glass rope, a third polyester glass rope, a fourth polyester glass rope, a thin polyester felt, and a thick polyester felt. The air cover is evenly distributed on the circumference on the first step formed by the core end plates and the core step plates at the upper and lower ends of the stator core. The insulating back plate, the sealing ring, and the insulating sealing plate are radially stacked in sequence according to the position of the holes processed on the air cover. The four polyester glass ropes are used to tie and fix them in sequence on the adjacent slotted pads and stator rods by a threading method, and the circumference is closed to achieve radial closure of the upper and lower ends of the stator core. The thin polyester felt and the thick polyester felt are used in combination to be impregnated with a two-component coating impregnating glue to fill the physical gap between the end windshield structure and the stator rods.

[0004] In the aforementioned high-speed pumped-storage generator motor stator end windshield structure, the air cover is made of epoxy glass cloth laminate. The air cover is machined sequentially from the core step sheet side to the wire rod end side, with first round through holes, two per group, evenly spaced between groups; first waist-shaped through holes, evenly spaced between holes; and second round through holes, two per group, evenly spaced between groups. After machining, the air cover must be dipped in epoxy agar varnish.

[0005] In the aforementioned high-speed pumped-storage generator motor stator end windshield structure, the sealing ring is made of heat-resistant rubber sheet. Secondary waist-shaped through-holes are formed in sequence from the core stepped sheet side to the wire rod end side, evenly spaced between the holes. Thirdly, round through-holes are formed in groups of two, evenly spaced between the groups. Thirdly, waist-shaped through-holes are formed in groups of two, evenly spaced between the groups. The centerlines of the third waist-shaped through-hole groups are offset toward the curvature of the stator wire rod. A radial trapezoidal protrusion is formed between the third and fourth holes in the sealing ring.

[0006] In the aforementioned high-speed pumped-storage generator stator end windshield structure, the insulating backplate is made of epoxy glass cloth laminate. The insulating backplate is machined sequentially from the core step side to the wire rod end side with four waist-shaped through holes evenly spaced. Four round through holes are machined in groups of two, evenly spaced between groups. Five waist-shaped through holes are machined in groups of two, evenly spaced between groups. The centerlines of the five waist-shaped through hole groups are offset toward the curvature of the stator wire rod. After machining, the insulating backplate must be dipped in epoxy agar varnish.

[0007] In the aforementioned high-speed pumped-storage generator motor stator end windshield structure, the insulating cover is made of epoxy glass cloth laminate. Sixth waist-shaped through holes are machined in the center of the insulating cover, with two holes per group, evenly spaced between groups. The center lines between the sixth waist-shaped through holes are offset in the direction of the stator bar bend. After machining, the insulating cover must be dipped in epoxy agar dry varnish.

[0008] Due to the adoption of the above solution, the beneficial effects of the utility model are:

[0009] 1. The main components used in this utility model are all epoxy glass cloth laminated sheets, which are easy to cut and process, have a simple structure, are bendable, and are fixed to the nearest wire rods and notch pads using polyester glass ropes. They are easy to install and can be replaced for later maintenance.

[0010] 2. The stator end wind shield structure in the present invention: the wind shield height of the stator core end is increased in the vertical direction, and at the same time, the trapezoidal protrusion on the sealing strip makes the sealing effect between the rubber on the outer circle of the air induced draft plate and the sealing strip better. The deviations during the processing and installation of the air induced draft plate can be controlled within the adjustment range of the two-stage elastic connection. The sealing of the end allows the air volume generated by the high-speed rotation of the rotor to all be deflected along the upper and lower air induced draft plates toward the center line side of the stator and rotor through the ventilation groove of the stator core, transferring the heat loss generated by the operation of the unit to the air cooler. The gas flows along the designated channel without generating turbulence or backflow, directly improving the air cooling and heat exchange efficiency of the unit and effectively improving the operating parameters of the unit.

[0011] 3. The wind shield structure at the stator end of the present invention can directly raise the closed height from the vertical direction without having to use an inward-probing draft plate to achieve the sealing of the air flow channel. The unnecessary draft plates are tilted inward toward the center line of the stator and rotor, which also avoids interference with the pole-to-pole connection and reserves installation space for various forms of pole-end connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The following is a brief introduction to the drawings required for the embodiments:

[0013] Figure 1 This is a schematic diagram of the end binding of the windshield structure at the stator end of a high-speed pumped storage generator motor;

[0014] Figure 2 This is a cross-sectional view of the end portion of the wind shield structure at the stator end of a high-speed pumped-storage generator motor;

[0015] Figure 3 This is a detailed drawing of the air cover structure of the stator end windshield structure of the high-speed pumped storage generator motor;

[0016] Figure 4 This is a detailed diagram of the sealing ring structure of the windshield structure at the stator end of a high-speed pumped-storage generator motor;

[0017] Figure 5 This is a cross-sectional view of the sealing ring of the windshield structure at the stator end of a high-speed pumped-storage generator motor;

[0018] Figure 6 Detailed drawing of the insulation back plate structure of the stator end windshield structure of the high-speed pumped storage generator motor;

[0019] Figure 7 This is a detailed drawing of the insulation sealing plate structure of the stator end windshield structure of the high-speed pumped storage generator motor.

[0020] Description of component numbers in the figure:

[0021] 1-air cover; 2-sealing ring; 3-insulating back plate; 4-insulating sealing plate; 5-first polyester-glass rope; 6-second polyester-glass rope; 7-third polyester-glass rope; 8-fourth polyester-glass rope; 9-thin polyester felt; 10-thick polyester felt; 11-two-component brushing impregnation glue; 12-first round through hole; 13-first waist-shaped through hole; 14-second round through hole; 15-epoxy agar dry varnish; 16-second waist-shaped through hole; 17-third round through hole; 18-third waist-shaped through hole; 19-trapezoidal protrusion; 20-fourth waist-shaped through hole; 21-fourth round through hole; 22-fifth waist-shaped through hole; 23-sixth waist-shaped through hole. DETAILED DESCRIPTION

[0022] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0023] like Figures 1 to 7 As shown, a high-speed pumped storage generator motor stator end windshield structure, consisting of an air cover 1, a sealing ring 2, an insulating back plate 3, an insulating sealing plate 4, a first polyester glass rope 5, a second polyester glass rope 6, a third polyester glass rope 7, a fourth polyester glass rope 8, a thin polyester felt 9, and a thick polyester felt 10. The air cover 1 is evenly distributed around the circumference and placed on the first step formed by the core end pieces and the core step pieces at the upper and lower ends of the stator core. The insulating back plate 3, the sealing ring 2, and the insulating sealing plate 4 are radially stacked in sequence according to the positions of the holes processed on the air cover. All the processed The circular and waist-shaped through-holes are spatially aligned, and the number of hole groups correlates with the number of stator slots. The first polyester-glass rope secures the air hood 1 to the upper and lower layers of the stator bars, utilizing the gaps between the bars and the pressure fingers. The second polyester-glass rope passes through the central wedge-shaped hole of the slotted spacer to secure the air hood 1, sealing ring 2, and insulating backing plate 3 to the upper and lower layers of the stator bars. The third polyester-glass rope secures the air hood 1, sealing ring 2, insulating backing plate 3 to the upper layer of the stator bars. The fourth polyester-glass rope secures the sealing ring 2, insulating backing plate 3, and insulating sealing plate 4 to the upper layer of the stator bars. This achieves radial closure of the upper and lower ends of the stator core. Thin polyester felt 9 and thick polyester felt 10 are combined and impregnated with a two-component impregnating adhesive 11 to fill the physical gap between the end windshield structure and the stator bars.

[0024] Furthermore, the air cover 1 is made of epoxy glass cloth laminate. The air cover 1 is machined sequentially from the core step side to the wire rod end side with a first row of first round through holes 12, two per group, evenly spaced between groups. A second row of first waist-shaped through holes 13 is machined, evenly spaced between holes. A third row of second round through holes 14 is machined, two per group, evenly spaced between groups. After machining, the air cover 1 is dipped in epoxy agar dry varnish 15.

[0025] Furthermore, the sealing ring 2 is made of heat-resistant rubber sheet. A second row of second waist-shaped through holes 16 are processed sequentially from the core step side to the wire rod end side, evenly spaced between the holes. A third row of third round through holes 17 are processed, with two holes per group, evenly spaced between the groups. A fourth row of third waist-shaped through holes 18 are processed, with two holes per group, evenly spaced between the groups. Because the fourth row of holes is positioned a certain distance above the core, the stator wire rods have entered the oblique line segment and deviated toward other slots. Therefore, the center lines between the groups of third waist-shaped through holes 18 are offset toward the bending direction of the stator wire rods, and waist-shaped through holes are processed. The sealing ring 2 has a radial trapezoidal protrusion 19 between the third and fourth holes.

[0026] Furthermore, the insulating backplane 3 is made of epoxy glass cloth laminate. A second row of four waist-shaped through holes 20 are machined from the core step side to the stator bar end side, evenly spaced. A third row of four round through holes 21 are machined, each grouping two holes evenly spaced. A fourth row of five waist-shaped through holes 22 are machined, each grouping two holes evenly spaced. The centerlines of the five waist-shaped through holes 22 are offset toward the stator bar bend, similar to the sealing ring 2. After machining, the insulating backplane 3 must be dipped in epoxy agar dry varnish 15.

[0027] Furthermore, the insulating seal 4 is made of epoxy glass cloth laminate, and is machined with four and six waist-shaped through-holes 23 in the middle, two per group, evenly spaced between groups. The centerline of the six waist-shaped through-holes 23 between groups is offset in the direction of the stator bar bend, similar to the sealing ring 2. After machining, the insulating seal 4 must be dipped in epoxy agar dry varnish 15.

[0028] Specifically, the stator end windshield structure used in the present invention increases the windshield height of the stator core end in the vertical direction. At the same time, the trapezoidal protrusion on the sealing strip makes the sealing effect between the rubber on the outer circle of the air induced draft plate and the sealing strip better. The deviations during the processing and installation of the air induced draft plate can be controlled within the adjustment range of the two-stage elastic connection. The sealing of the end allows the air volume generated by the high-speed rotation of the rotor to all be deflected along the upper and lower air induced draft plates toward the center line side of the stator and rotor through the stator core ventilation groove, transferring the heat loss generated by the operation of the unit to the air cooler. The gas flows along the designated channel without generating turbulence or backflow, directly improving the air cooling and heat exchange efficiency of the unit and effectively improving the operating parameters of the unit.

[0029] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments or that some or all of the technical features may be replaced with equivalents; however, such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the present invention.

Claims

1. A high-speed pumped storage generator stator end wind shield structure, characterized by: The invention comprises an air cover (1), a sealing ring (2), an insulating back plate (3), an insulating sealing plate (4), a first polyester glass rope (5), a second polyester glass rope (6), a third polyester glass rope (7), a fourth polyester glass rope (8), a thin polyester felt (9), and a thick polyester felt (10). The air cover (1) is evenly distributed on the circumference and placed on the first step formed by the core end plates and the core step plates at the upper and lower ends of the stator core. The insulating back plate (3), the sealing ring (2), and the insulating sealing plate (4) are radially stacked in sequence according to the position of the holes processed on the air cover. The four polyester glass ropes are sequentially tied and fixed on the adjacent slotted pads and the stator wire rods to block the wind path at the two ends of the stator core. The thin polyester felt (9) and the thick polyester felt (10) are soaked with a two-component impregnating glue (11) to fill the physical gap between the end windshield structure and the stator wire rods.

2. The high-speed pumped storage generator stator end wind shield structure according to claim 1, characterized in that: The material of the air cover (1) is epoxy glass cloth laminate. The air cover (1) is processed sequentially from the core step sheet side to the wire rod end side with first round through holes (12), two in each group, and evenly distributed between groups; first waist-shaped through holes (13) are processed, and the holes are evenly distributed; second round through holes (14) are processed, two in each group, and evenly distributed between groups. The processed air cover (1) is dipped in epoxy agar dry paint (15).

3. The high-speed pumped storage generator stator end wind shield structure according to claim 1, characterized in that: The sealing ring (2) is made of a heat-resistant rubber plate. The sealing ring (2) is processed with second waist-shaped through holes (16) in sequence from the core step sheet side to the wire rod end side, and the holes are evenly distributed; the third round through holes (17) are processed, with two in each group and evenly distributed between the groups; the third waist-shaped through holes (18) are processed, with two in each group and evenly distributed between the groups. The center lines between the third waist-shaped through holes (18) are offset toward the bending direction of the stator wire rod. The sealing ring (2) has a radial trapezoidal protrusion (19) between the third hole and the fourth hole.

4. The high-speed pumped storage generator stator end wind shield structure according to claim 1, characterized in that: The insulating back plate (3) is made of epoxy glass cloth laminate. The insulating back plate (3) is processed with fourth waist-shaped through holes (20) in sequence from the core step plate side to the wire rod end side, and the holes are evenly distributed; fourth round through holes (21) are processed, with two in each group and evenly distributed between the groups; fifth waist-shaped through holes (22) are processed, with two in each group and evenly distributed between the groups, and the center lines of the fifth waist-shaped through holes (22) are offset toward the bending direction of the stator wire rod. The processed insulating back plate (3) is dipped in epoxy agar dry paint (15).

5. The high-speed pumped storage generator stator end wind shield structure according to claim 1, characterized in that: The insulating sealing plate (4) is made of epoxy glass cloth laminate, and the insulating sealing plate (4) is processed in the middle with six waist-shaped through holes (23), two in each group, and evenly distributed between groups. The center lines between the six waist-shaped through holes (23) are offset toward the bending direction of the stator bar. The processed insulating sealing plate (4) is dipped in epoxy agar dry paint (15).

Images