Totally-closed stator base of variable-speed generator motor

Abstract

The invention discloses a totally-closed stator frame of a variable-speed generator motor, belongs to the field of variable-speed pumped storage, and aims to solve the problem that a stator frame of an existing constant-speed generator cannot circularly cool a rotor bar higher than the end part of a rotor magnet yoke in an end part air return manner. Comprising a top ring, an upper ring, a lower ring and a bottom ring which are sequentially and coaxially arranged at intervals from top to bottom, a plurality of middle rings are coaxially arranged between the upper ring and the lower ring at intervals from top to bottom, the top ring, the upper ring, the middle rings, the lower ring and the bottom ring are connected through a plurality of components, and the periphery of the top ring is connected with the periphery of the upper ring through a non-driving end annular wall. The upper ring and the lower ring are each provided with a plurality of end air channeling holes, the air volume adjusting cover plates adjust the opening sizes of the end air channeling holes in a one-to-one correspondence mode, and a plurality of air cooler supports are arranged on the circumference of the main side wall. And the suppression of the temperature rise of the end part of the rotor bar is realized.

Description

Technical Field

[0001] The present invention belongs to the field of variable-speed pumped storage, and particularly relates to a fully enclosed stator frame of a variable-speed generating motor. Background Art

[0002] A new power system is a power system with the basic premise of ensuring energy and power security, the primary goal of meeting the power demand of economic and social development, the main task of maximizing the consumption of new energy, a strong smart grid as the hub platform, and the interaction of source-network-load-storage and multi-energy complementarity as the support, and has the basic characteristics of being clean, low-carbon, safe, controllable, flexible, efficient, intelligent, friendly, open, and interactive. In the new power system, the relationship between new energy and traditional energy, such as wind and light new energy, "depends on the weather" and has characteristics such as intermittency, randomness, and volatility. Pumped storage is currently recognized as the safest, most stable, most mature, most environmentally friendly, most economical, and most suitable for large-scale development energy storage method, and has advantages such as peak shaving and valley filling, frequency modulation, phase modulation, energy storage, accident standby, black start, and new energy consumption. At present, the pumped storage units mainly built in China are fixed-speed units, that is, they can only realize the conversion of pumping and generating conditions at a fixed speed.

[0003] Variable-speed pumped storage units have the advantages of flexibly adjusting the input power of the pump working condition, improving the accuracy of power grid frequency regulation, being able to instantaneously inject a large amount of active power into the power grid, improving the transient stability of the system, being able to independently adjust the active power and reactive power, adapting to a wider head range and flow rate changes, and reducing problems such as cavitation and erosion. At present, it has gradually attracted the attention of major power generation groups. As a main application of variable-speed regulation technology route, AC excitation variable speed is to use a doubly-fed motor combined with an AC excitation frequency conversion device. The rotor winding is upgraded from DC excitation to three-phase AC excitation. By adjusting the rotor frequency, the variable speed of the pumped storage unit is realized. The rotor structure is adjusted from a small number of series-connected rectangular pole coils to a strip winding with parallel branches, and the rotation direction and speed are changed with the conversion of the working condition. At present, the commonly used fixed-speed generating motor stator frame cannot circulate and cool the rotor bars that are higher than the end of the rotor yoke through the end air return method. Therefore, there is an urgent need for a new structure stator frame that cooperates with the three-phase AC excitation rotor, suppresses air return at the end, has a top ring and a bottom ring, and circulates and cools outside the ring. Summary of the Invention

[0004] The purpose of the present invention is to provide a fully enclosed stator frame of a variable-speed generating motor to solve the problem that the existing fixed-speed generating motor stator frame cannot circulate and cool the rotor bars that are higher than the end of the rotor yoke through the end air return method. The technical solution adopted by the present invention is as follows:

[0005] A fully enclosed stator frame for a variable-speed generating motor, comprising a top ring, an upper ring, a lower ring and a bottom ring coaxially arranged at intervals from top to bottom. Between the upper ring and the lower ring, a number of middle rings are coaxially arranged at intervals from top to bottom. The upper ring, the number of middle rings and the lower ring are connected by a support pipe group. The top ring, the upper ring, the number of middle rings and the lower ring are connected by a lifting pipe group. The top ring, the upper ring, the number of middle rings, the lower ring and the bottom ring are connected by a long support rod group. The upper ring, the number of middle rings, the lower ring and the bottom ring are connected by a short support rod group. The outer peripheries of the top ring and the upper ring are connected by a non-drive-end annular wall. A number of end air leakage holes are opened on both the upper ring and the lower ring. A number of air volume adjustment covers respectively adjust the opening sizes of the number of end air leakage holes. Laminar spaces are formed between the upper ring and the adjacent middle ring, between two adjacent middle rings, and between the lower ring and the adjacent middle ring. A number of annular frame walls respectively enclose the outer peripheries of the number of said laminar spaces. The number of annular frame walls constitute the main side walls of the stator frame. A number of air cooler supports are circumferentially arranged on the main side walls. The air cooler supports are of rectangular frame structure. Cooling openings adapted to the air cooler supports are opened on the main side walls. A number of stator foundation piers are circumferentially arranged at the lower end of the bottom ring.

[0006] Further, the outer diameters of the top ring, the upper ring, the middle ring, the lower ring and the bottom ring are equal. The inner diameters of the upper ring, the middle ring, the lower ring and the bottom ring are all smaller than the inner diameter of the top ring. The support pipe group is composed of a number of support steel pipes. The number of support steel pipes are circumferentially and evenly arranged around the axis of the main side wall. Each support steel pipe penetrates through the radial inner ends of the number of middle rings.

[0007] The lifting pipe group is composed of a number of lifting steel pipes. The number of lifting steel pipes are circumferentially and evenly arranged around the axis of the main side wall outside the number of support steel pipes. Each lifting steel pipe penetrates through the top ring, the upper ring, the number of middle rings and the lower ring.

[0008] The long support rod group is composed of a number of long support round steel bars. Two long support round steel bars form a pair. The number of long support round steel bars are divided into a number of pairs. The number of pairs of long support round steel bars are circumferentially and evenly arranged around the axis of the main side wall. Each long support round steel bar penetrates through the top ring, the upper ring, the number of middle rings, the lower ring and the bottom ring.

[0009] The short support rod group is composed of a number of short support round steel bars. Two short support round steel bars form a pair. The number of short support round steel bars are divided into a number of pairs. The number of pairs of short support round steel bars are circumferentially and evenly arranged around the axis of the main side wall. Each short support round steel bar penetrates through the upper ring, the number of middle rings, the lower ring and the bottom ring. The number of pairs of long support round steel bars and the number of pairs of short support round steel bars are circumferentially arranged at intervals. A pair of long support round steel bars or a pair of short support round steel bars are provided between any two adjacent lifting steel pipes.

[0010] Furthermore, the top ring and the upper ring are connected by a number of right-angled ribs on three sides of the non-driving end. The three right-angled ribs on the non-driving end are in the shape of a Chinese character "匚". The three right-angled ribs on the non-driving end are respectively connected to the annular wall of the non-driving end, and the parts of the several hanging steel pipes between the top ring and the upper ring are enclosed one by one.

[0011] Layer spaces are formed between the upper ring and the adjacent middle ring, between two adjacent middle rings, and between the lower ring and the adjacent middle ring. Several annular machine base walls correspond one to one to close the outer peripheries of several said layer spaces. Multiple arc ribs are divided into multiple groups according to the number of said layer spaces. Several arc ribs in each group are respectively connected to the machine base walls of the same height, and surround the parts of several lifting steel pipes in the corresponding layer spaces one by one.

[0012] Furthermore, a rectangular window is opened on the non-driving end annular wall between any two adjacent lifting steel pipes, and the inspection frame is adapted to be connected to the rectangular window. The two inspection frames arranged along the direction of the main lead-out line and the neutral point lead-out line are covered by the main center lead insulation isolation wall, and the remaining inspection frames are covered by a closed cover plate, and the closed cover plate and the corresponding inspection frame are sealed by a rubber seal. The closed cover plate or the center lead insulation isolation wall is fixed to the inspection frame by a first bolt and a single-ear stop washer.

[0013] Furthermore, the main center lead insulation isolation wall is an epoxy insulation material component, and a plurality of rectangular holes for the main center lead to pass through are provided on the main center lead insulation isolation wall. The first bolt is a low magnetic permeability bolt, and the single-ear stop washer is a stainless steel material washer.

[0014] Furthermore, a plurality of gaskets are welded circumferentially on the upper end surface of the upper ring, and the plurality of gaskets cover the upper ends of the plurality of supporting steel pipes in a one-to-one correspondence.

[0015] Furthermore, the stator foundation buttress is fixed to the bottom ring through a second bolt and a flat washer.

[0016] Furthermore, the lower ring and the bottom ring are also connected by a number of three-sided right-angled ribs at the driving end, and the three-sided right-angled ribs at the driving end are arranged circumferentially. The three-sided right-angled ribs at the driving end are equal straight rod components arranged vertically. The cross-section of the three-sided right-angled ribs at the driving end is in the shape of a "匚". The adjacent vertical sides of the two adjacent three-sided right-angled ribs at the driving end are connected by the arc-shaped wall of the driving end, and a quick-opening hand hole is provided on the arc-shaped wall of the driving end.

[0017] Furthermore, a plurality of fixing screw holes are processed in the areas near each end air vent on the upper ring and the lower ring, and a plurality of air volume adjustment cover plates are connected to the corresponding fixing screw holes through third bolts.

[0018] Furthermore, the vertical frames on both sides of the air cooler support are connected by a plurality of horizontally arranged partitions, the plurality of partitions are aligned with the plurality of middle rings in a one-to-one correspondence and at the same height, and air gaps are left between the partitions and the corresponding middle rings.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention reconstructs the air flow path of the air cooling of the pumped-storage unit, encloses the stator frame, and only leaves the area covered by the air cooler as the air flow outlet, changing the end air flow path direction of the constant-speed pumped-storage stator frame. With the help of the forced air intake device, the air flow path is adjusted from the end return air semi-cycle cooling to the large outer cycle cooling of the top ring and bottom ring of the stator frame, extending the air flow path. Under the negative pressure formed by the high-speed rotation on the inner side of the rotor circumference, the return air speed is increased, and the temperature rise of the end of the rotor bar is suppressed.

[0021] 2. The present invention simplifies the main structure of the stator frame, sets the top ring, upper ring, middle ring, lower ring and bottom ring as circumferential supports, and sets the lifting steel pipe, short support round steel, support steel pipe and long support round steel as axial supports. No rib plate is set between the top ring and the upper ring, and short support round steel is set at the main middle lead-out line, and it is only welded through to the upper ring, improving the overall frame stiffness of the stator frame.

[0022] 3. The present invention sets a number of kidney-shaped air discharge holes parallel to the centripetal line on the upper ring and the lower ring, evenly distributes the air volume and heat accumulated at the upper and lower ends of the stator frame along the pressure direction to the main air flow path covered by the air cooler, and at the same time sets an adjustable air volume adjustment cover plate to realize the dynamic adjustment of the air volume.

[0023] 4. The present invention is applicable to large-capacity large pumped-storage variable-speed generating units. The present invention can be modularly designed. The axial positions of the upper ring, middle ring and lower ring can be adjusted according to the height of the stator core. The gaps between the top ring and the upper ring, and between the bottom ring and the lower ring can be axially adjusted according to the size limit of the bar end. The bottom ring can also be bolted and fixed to different-sized stator foundation piers or stator foundation plates. The structure of the present invention is flexible and has wide engineering application and popularization value. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is a half-sectional view of the present invention;

[0026] Figure 3 is Figure 2 an enlarged view of part A of;

[0027] Figure 4 is a top view of the present invention;

[0028] Figure 5 is a schematic structural diagram of the main middle lead insulation isolation wall.

[0029] In the figure, 1 - top ring; 2 - upper ring; 3 - middle ring; 4 - lower ring; 5 - bottom ring; 6 - stator foundation pier; 7 - air cooler support; 8 - packing ring; 9 - non - drive - end annular wall; 10 - non - drive - end three - sided right - angled rib; 11 - maintenance frame; 12 - rubber pad; 13 - closed cover plate; 14 - main middle - lead insulation partition wall; 15 - partition board; 16 - quick - opening manhole; 17 - lifting steel pipe; 18 - long supporting round steel; 19 - short supporting round steel; 20 - supporting steel pipe; 21 - arc - shaped rib; 22 - drive - end arc - shaped wall; 23 - drive - end three - sided right - angled rib; 24 - joint block; 25 - frame wall; 26 - first bolt; 27 - single - ear lock washer; 28 - joint bolt; 29 - joint nut; 30 - second bolt; 31 - flat washer; 32 - end air - leakage hole; 33 - fixing screw hole; 34 - third bolt; 35 - air - volume regulating cover plate; 36 - air - leakage gap; 37 - rectangular window; 38 - rectangular hole. Detailed implementation mode

[0030] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described below through specific embodiments shown in the drawings. However, it should be understood that these descriptions are only exemplary and do not limit the scope of the present invention. In addition, in the following description, the descriptions of well - known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0031] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connection is an undetachable connection, including but not limited to conventional fixed connection methods such as flanging connection, riveting connection, bonding connection and welding connection, etc. The detachable connection includes but not limited to conventional disassembly methods such as bolt connection, snap - connection, pin connection and hinge connection, etc. When the specific connection method is not clearly defined, it is defaulted that at least one connection method can be found in the existing connection methods to achieve this function, and those skilled in the art can select according to their needs. For example: for the fixed connection, welding connection is selected; for the detachable connection, bolt connection is selected.

[0032] The following will further elaborate on the present invention in conjunction with the drawings. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.

[0033] Embodiment: As Figures 1 to 5As shown in the figure, a fully enclosed stator frame of a variable-speed generating motor includes a top ring 1, an upper ring 2, a lower ring 4, and a bottom ring 5 that are coaxially spaced from top to bottom in sequence. Between the upper ring 2 and the lower ring 4, several middle rings 3 are coaxially spaced from top to bottom. The upper ring 2, several middle rings 3, and the lower ring 4 are connected by a support pipe group. The top ring 1, the upper ring 2, several middle rings 3, and the lower ring 4 are connected by a lifting pipe group. The top ring 1, the upper ring 2, several middle rings 3, the lower ring 4, and the bottom ring 5 are connected by a long support rod group. The upper ring 2, several middle rings 3, the lower ring 4, and the bottom ring 5 are connected by a short support rod group. The outer peripheries of the top ring 1 and the upper ring 2 are connected by a non-drive-end annular wall 9. Several end air leakage holes 32 are opened on both the upper ring 2 and the lower ring 4. Several air volume adjustment covers 35 adjust the opening sizes of the corresponding end air leakage holes 32 one by one. Laminar spaces are formed between the upper ring 2 and the adjacent middle ring 3, between two adjacent middle rings 3, and between the lower ring 4 and the adjacent middle ring 3. Several annular frame walls 25 enclose the peripheries of the corresponding laminar spaces one by one. The several annular frame walls 25 constitute the main side walls of the stator frame. Several air cooler supports 7 are circumferentially arranged on the main side walls. The air cooler supports 7 are of rectangular frame structure. Several cooling openings adapted to the air cooler supports 7 are opened on the main side walls. Several stator foundation piers 6 are circumferentially arranged at the lower end of the bottom ring 5.

[0034] The top ring 1 is formed by splicing several sector-shaped plates. Seam joining block devices 24 are welded at the butting edges of two adjacent sector-shaped plates. The corresponding two seam joining block devices 24 are joined by seam joining bolts 28 and seam joining nuts 29. First, each sector-shaped plate is welded into one body, and then the seam joining block devices 24, the seam joining bolts 28, and the seam joining nuts 29 are integrally cut off. The upper ring 2, the middle ring 3, the lower ring 4, and the bottom ring 5 are all processed in the same way as the top ring 1.

[0035] During application, forced air induction devices are arranged above and below the stator frame. When the rotor rotates at a high speed, wind pressure is generated to form an air flow. The air flow blows outwards along the radial direction through several air cooler supports 7. The air flow passes through the air cooler supports 7 and is cooled down, and is divided into two streams. One stream of air flow bypasses the top ring 1 upwards and then flows downwards along the axial direction of the rotor. The other stream of air flow bypasses the bottom ring 5 downwards and then flows upwards along the axial direction of the rotor. The present invention reconstructs the air flow path of the air cooling of the pumped-storage unit, encloses the stator frame, and only leaves the area covered by the air cooler as the air flow outlet, changing the end air flow path direction of the fixed-speed pumped-storage stator frame. With the aid of the forced air induction device, the air flow path is adjusted from the end air return semi-circular cooling to the large outer circular cooling of the top ring 1 and the bottom ring 5 of the stator frame, extending the air flow path. Under the negative pressure formed by the high-speed rotation on the inner side of the rotor circumference, the air return speed is increased, and the temperature rise of the end of the rotor bar is suppressed.

[0036] The outer diameters of the top ring 1, the upper ring 2, the middle ring 3, the lower ring 4 and the bottom ring 5 are equal, and the inner diameters of the upper ring 2, the middle ring 3, the lower ring 4 and the bottom ring 5 are all smaller than the inner diameter of the top ring 1. The support tube group is composed of a plurality of support steel tubes 20, and the plurality of support steel tubes 20 are evenly arranged around the axis of the main side wall. Each support steel tube 20 passes through the radial inner end of the plurality of middle rings 3, the upper end of the support steel tube 20 is located in the upper ring 2, and the lower end of the support steel tube 20 is against the upper end surface of the lower ring 4;

[0037] The lifting pipe group is composed of a plurality of lifting steel pipes 17, which are evenly arranged around the axis of the main side wall on the outside of the plurality of supporting steel pipes 20. Each lifting steel pipe 17 passes through the top ring 1, the upper ring 2, the plurality of middle rings 3 and the lower ring 4. The upper end of the lifting steel pipe 17 is located in the top ring 1, and the lower end of the lifting steel pipe 17 is located in the lower ring 4.

[0038] The long support rod group is composed of a plurality of long support round steels 18, two long support round steels 18 form a pair, and the plurality of long support round steels 18 are divided into several pairs, and the pairs of long support round steels 18 are evenly arranged around the axis of the main side wall. Each long support round steel 18 passes through the top ring 1, the upper ring 2, the plurality of middle rings 3, the lower ring 4 and the bottom ring 5. The upper end of the long support round steel 18 is located in the top ring 1, and the lower end of the support round steel 18 is located in the bottom ring 5.

[0039] The short support rod group is composed of multiple short support round steels 19, two short support round steels 19 form a pair, and multiple short support round steels 19 are divided into several pairs. Several pairs of short support round steels 19 are evenly arranged around the axis of the main side wall. Each short support round steel 19 passes through the upper ring 2, several middle rings 3, the lower ring 4 and the bottom ring 5. The upper end of the short support round steel 19 is in the upper ring 2, and the lower end of the short support round steel 19 is in the bottom ring 5. Several pairs of long support round steels 18 and several pairs of short support round steels 19 are arranged at intervals around the circumference, and a pair of long support round steels 18 or a pair of short support round steels 19 is provided between any two adjacent lifting steel pipes 17.

[0040] The present invention simplifies the main structure of the stator base, and provides a top ring 1, an upper ring 2, a middle ring 3, a lower ring 4 and a bottom ring 5 as circumferential supports, and provides a lifting steel pipe 17, a short supporting round steel 19, a supporting steel pipe 20 and a long supporting round steel 18 as axial supports. No rib plate is provided between the top ring 1 and the upper ring 2, and a short supporting round steel 19 is provided at the main center lead-out line, which is only penetrated and welded to the upper ring 2, thereby improving the overall frame rigidity of the stator base.

[0041] The top ring 1 and the upper ring 2 are further connected by a number of right-angled ribs 10 on three sides of the non-driving end. The three-side right-angled ribs 10 on the non-driving end are in the shape of a Chinese character "匚". The three-side right-angled ribs 10 on the non-driving end are respectively connected to the non-driving end annular wall 9 and enclose the parts of the several hanging steel pipes 17 between the top ring 1 and the upper ring 2 in a one-to-one correspondence.

[0042] A layer space is formed between the upper ring 2 and the adjacent middle ring 3, between two adjacent middle rings 3, and between the lower ring 4 and the adjacent middle ring 3. A plurality of annular base walls 25 respectively enclose the outer periphery of a plurality of said layer spaces. A plurality of arc-shaped ribs 21 are divided into multiple groups according to the number of said layer spaces. A plurality of arc-shaped ribs 21 in each group are respectively connected to the base walls 25 at the same height. The arc-shaped ribs 21 and the base walls 25 are welded with their arc surfaces facing each other, and the parts of a plurality of lifting steel pipes 17 located in the corresponding layer spaces are respectively surrounded therein.

[0043] Rectangular windows 37 are provided at the positions between any two adjacent lifting steel pipes 17 on the non-driving end annular wall 9. The inspection frames 11 are adaptively connected to the rectangular windows 37. The two inspection frames 11 arranged along the main lead-out line and the neutral point lead-out line directions are covered by the main neutral lead-insulating partition wall 14. The remaining inspection frames 11 are covered by the closing covers 13. The closing covers 13 and the corresponding inspection frames 11 are sealed by rubber seals 12. The closing covers 13 or the neutral lead-insulating partition wall 14 are fixed on the inspection frames 11 by the first bolts 26 and single-ear stop washers 27.

[0044] The main neutral lead-insulating partition wall 14 is a component made of epoxy insulating material. A plurality of rectangular holes 38 for the main neutral lead to pass through are provided on the main neutral lead-insulating partition wall 14. The first bolts 26 are low magnetic permeability bolts, and the single-ear stop washers 27 are washers made of stainless steel material.

[0045] The present invention is applicable to large-capacity large pumped-storage variable-speed generating units. The present invention can be modularly designed. The axial positions of the upper ring 2, the middle ring 3, and the lower ring 4 can be adjusted according to the height of the stator core. The gaps between the top ring 1 and the upper ring 2, and between the bottom ring 5 and the lower ring 4 can be axially adjusted according to the size limit of the end of the wire bar. The bottom ring 5 can also be bolted and fixed to the stator foundation pier 6 or the stator base plate with different sizes. The structure of the present invention is flexible and has wide engineering application and popularization value.

[0046] A plurality of cushion rings 8 are circumferentially welded on the upper end surface of the upper ring 2. A plurality of cushion rings 8 respectively cover the upper ends of a plurality of support steel pipes 20.

[0047] The stator foundation pier 6 is bolted and fixed to the bottom ring 5 by the second bolts 30 and flat washers 31.

[0048] The lower ring 4 and the bottom ring 5 are also connected by a number of three-sided right-angled ribs 23 on the driving end. The three-sided right-angled ribs 23 on the driving end are arranged circumferentially. The three-sided right-angled ribs 23 on the driving end are equal straight rod components arranged vertically. The cross-section of the three-sided right-angled ribs 23 on the driving end is in the shape of a "匚". The upper end of the three-sided right-angled ribs 23 on the driving end is connected to the lower ring 4, and the lower end of the three-sided right-angled ribs 23 on the driving end is connected to the bottom ring 5. The opening of the three-sided right-angled ribs 23 on the driving end is arranged radially outward along the lower ring 4. The adjacent vertical sides of two adjacent three-sided right-angled ribs 23 on the driving end are connected through the driving end arc wall 22, and the driving end arc wall 22 is provided with a quick-opening hand hole 16.

[0049] Several fixing screw holes 33 are processed in the area near each end air vent 32 on the upper ring 2 and the lower ring 4, and several air volume adjustment cover plates 35 are connected to the corresponding fixing screw holes 33 through third bolts 34.

[0050] The present invention provides a plurality of waist-shaped air vents parallel to the centripetal line on the upper ring 2 and the lower ring 4, which distribute the air volume and heat accumulated at the upper and lower ends of the stator frame to the main air path covered by the air cooler along the pressure direction, and at the same time, an adjustable air volume adjustment cover 35 is provided to realize dynamic adjustment of the air volume.

[0051] The vertical frames on both sides of the air cooler support 7 are connected by several horizontal partitions 15. The partitions 15 are aligned with the middle rings 3 at the same height, and air gaps 36 are left between the partitions 15 and the corresponding middle rings 3. The air gaps 36 can balance the air volume distribution of each air path and improve the air cooling effect.

[0052] The above embodiments are merely illustrative of the present invention and do not limit its scope of protection. Those skilled in the art may make partial changes thereto, which are within the scope of protection of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A fully enclosed stator frame of a variable-speed generating motor, characterized in that: It includes a top ring (1), an upper ring (2), a lower ring (4) and a bottom ring (5) which are coaxially and spaced from top to bottom in sequence. Between the upper ring (2) and the lower ring (4), a number of middle rings (3) are coaxially and spaced from top to bottom. The upper ring (2), the number of middle rings (3) and the lower ring (4) are connected by a support pipe group. The top ring (1), the upper ring (2), the number of middle rings (3) and the lower ring (4) are connected by a lifting pipe group. The top ring (1), the upper ring (2), the number of middle rings (3), the lower ring (4) and the bottom ring (5) are connected by a long support rod group. The upper ring (2), the number of middle rings (3), the lower ring (4) and the bottom ring (5) are connected by a short support rod group. The outer peripheries of the top ring (1) and the upper ring (2) are connected by a non-drive-end annular wall (9). Layer spaces are formed between the upper ring (2) and the adjacent middle ring (3), between two adjacent middle rings (3), and between the lower ring (4) and the adjacent middle ring (3). The outer peripheries of a number of annular machine base walls (25) respectively enclose a number of the layer spaces. A number of annular machine base walls (25) constitute the main side walls of the stator machine base. A number of air cooler supports (7) are circumferentially arranged on the main side walls. The air cooler supports (7) are of rectangular frame structure. Cooling openings adapted to the air cooler supports (7) are provided on the main side walls. A number of end air leakage holes (32) are provided on both the upper ring (2) and the lower ring (4). A number of air volume adjustment covers (35) respectively adjust the opening sizes of a number of the end air leakage holes (32). A number of stator foundation piers (6) are circumferentially arranged at the lower end of the bottom ring (5).

2. The fully enclosed stator frame of a variable-speed generating motor according to claim 1, characterized in that: The outer diameters of the top ring (1), the upper ring (2), the middle ring (3), the lower ring (4) and the bottom ring (5) are equal. The inner diameters of the upper ring (2), the middle ring (3), the lower ring (4) and the bottom ring (5) are all smaller than the inner diameter of the top ring (1). The support pipe group is composed of a number of support steel pipes (20). A number of support steel pipes (20) are circumferentially and evenly arranged around the axis of the main side wall. Each support steel pipe (20) passes through the radial inner ends of a number of middle rings (3); The lifting pipe group is composed of a number of lifting steel pipes (17). A number of lifting steel pipes (17) are circumferentially and evenly arranged around the axis of the main side wall outside a number of support steel pipes (20). Each lifting steel pipe (17) passes through the top ring (1), the upper ring (2), a number of middle rings (3) and the lower ring (4); The long support rod group is composed of a number of long support round steel bars (18). Two long support round steel bars (18) form a pair. A number of long support round steel bars (18) are divided into a number of pairs. A number of pairs of long support round steel bars (18) are circumferentially and evenly arranged around the axis of the main side wall. Each long support round steel bar (18) passes through the top ring (1), the upper ring (2), a number of middle rings (3), the lower ring (4) and the bottom ring (5); The short support rod group is composed of a plurality of short support round steels (19). Two short support round steels (19) form a pair, and the plurality of short support round steels (19) are divided into several pairs. The several pairs of short support round steels (19) are arranged circumferentially and evenly around the axis of the main side wall. Each short support round steel (19) passes through the upper ring (2), several middle rings (3), the lower ring (4) and the bottom ring (5). Several pairs of long support round steels (18) and several pairs of short support round steels (19) are arranged at intervals circumferentially. A pair of long support round steels (18) or a pair of short support round steels (19) are provided between any two adjacent lifting steel pipes (17).

3. The fully enclosed stator frame of a variable-speed generating motor according to claim 2, characterized in that: The top ring (1) and the upper ring (2) are also connected by several non-driving end three-sided right-angle ribs (23)(9). The non-driving end three-sided right-angle ribs (23)(9) are in an "L" shape. The several non-driving end three-sided right-angle ribs (23)(9) are respectively connected to the non-driving end annular wall (9), and enclose one by one the parts of the several lifting steel pipes between the top ring (1) and the upper ring (2). A layer space is formed between the upper ring (2) and the adjacent middle ring (3), between two adjacent middle rings (3), and between the lower ring (4) and the adjacent middle ring (3). The outer peripheries of the several layer spaces are hermetically sealed by several annular machine base walls (25) one by one. The plurality of arc-shaped ribs (21) are divided into multiple groups according to the number of the layer spaces. Several arc-shaped ribs (21) in each group are respectively connected to the machine base walls (25) at the same height, and enclose one by one the parts of the several lifting steel pipes within the corresponding layer spaces.

4. A fully enclosed stator frame of a variable-speed generating motor according to claim 2, characterized in that: Rectangular windows (37) are provided at the positions on the non-driving end annular wall (9) between any two adjacent lifting steel pipes (17). The inspection frames (11) are adaptively connected to the rectangular windows (37). The two inspection frames (11) arranged along the main lead-out line and the neutral point lead-out line directions are both covered by the main middle lead-insulating partition wall (14). The remaining inspection frames (11) are all covered by the closing covers (13). The closing covers (13) and the corresponding inspection frames (11) are sealed by rubber gaskets (12). The closing covers (13) or the middle lead-insulating partition wall are fixed on the inspection frames (11) by first bolts (26) and single-ear stop washers (27).

5. The all-closed stator frame of a variable-speed generating motor according to claim 4, characterized in that: The main middle lead-insulating partition wall (14) is an epoxy insulating material member. Several rectangular holes (38) for the main middle lead to pass through are provided on the main middle lead-insulating partition wall (14). The first bolts (26) are low magnetic permeability bolts, and the single-ear stop washers (27) are stainless steel material washers.

6. A fully enclosed stator frame of a variable-speed generating motor according to claim 2, characterized in that: Several cushion rings (8) are welded circumferentially on the upper end surface of the upper ring (2). The several cushion rings (8) cover the upper ends of the several support steel pipes (20) one by one.

7. A fully enclosed stator frame of a variable-speed generating motor according to claim 1, characterized in that: The stator foundation pier (6) is fixedly clamped and fixed on the bottom ring (5) by second bolts (30) and flat washers (31).

8. A fully enclosed stator frame of a variable-speed generator motor according to claim 1, characterized in that: The lower ring (4) and the bottom ring (5) are further connected by a plurality of driving end three-sided right-angled ribs (23), the plurality of driving end three-sided right-angled ribs (23) are arranged circumferentially, the driving end three-sided right-angled ribs (23) are vertically arranged straight beam members with equal cross-sections, the cross-section of the driving end three-sided right-angled ribs (23) is in the shape of a Chinese character "匚", the adjacent vertical sides of two adjacent driving end three-sided right-angled ribs (23) are connected by a driving end arc wall (22), and a quick-opening hand hole (16) is provided on the driving end arc wall (22).

9. A fully enclosed stator frame of a variable-speed generator motor according to claim 1, characterized in that: A plurality of fixing screw holes (33) are machined in the area near each end air vent (32) on the upper ring (2) and the lower ring (4), and the air volume adjustment cover plate (35) is arranged on the upper ring (2) or the lower ring (4) by engaging a third bolt (34) with the corresponding fixing screw hole (33).

10. A fully enclosed stator frame of a variable-speed generator motor according to any one of claims 1-9, characterized in that: The vertical frames on both sides of the air cooler support (7) are connected through a plurality of horizontally arranged partitions (15), the plurality of partitions (15) are aligned with the plurality of middle rings (3) in a one-to-one correspondence and are aligned at the same height, and an air gap (36) is left between the partitions (15) and the corresponding middle rings (3).

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