CN111648920B

CN111648920B - Ultra-compact medium-speed permanent magnet wind generating set

Info

Publication number: CN111648920B
Application number: CN202010579246.4A
Authority: CN
Inventors: 阳雪兵; 廖建敏; 宋晓萍; 章滔; 田湘龙
Original assignee: XEMC Windpower Co Ltd
Current assignee: XEMC Windpower Co Ltd
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2022-03-04
Anticipated expiration: 2040-06-23
Also published as: CN111648920A

Abstract

The invention discloses an ultra-compact medium-speed permanent magnet wind generating set, which comprises a hub, a brake disc, a gear box, a generator, an engine room casting, a movable platform assembly, a heat dissipation system and a yaw system, wherein the hub is arranged on the front end of the engine room casting; the hub is connected with an input shaft of the gear box, a brake disc is arranged on a flange surface connected with the hub and the gear box and is connected to the gear box through a bolt, an output shaft of the gear box penetrates through the generator, and the end part of the output shaft of the gear box is connected with a generator rotor through a coupling; the movable platform assembly is arranged in the cabin casting and divides the cabin casting into an equipment cavity and a heat dissipation cavity; the gearbox is fixedly connected with the generator and then installed in the equipment cavity, and the heat dissipation system and the yawing system are installed in the heat dissipation cavity. The hub end of the invention is directly connected to the gear box, the adopted single bearing and no main shaft are simpler than the same scheme, the structure of the transmission chain is compact, and the arrangement modes of the movable platform assembly, the radiator system and the yawing system in the engine room meet the requirements of light weight of the unit and small structural size of the engine room.

Description

Ultra-compact medium-speed permanent magnet wind generating set

Technical Field

The invention belongs to the technical field of wind power generation, and particularly relates to an ultra-compact medium-speed permanent magnet wind generating set.

Background

Acceleration rate type wind generating set compares and directly drives wind generating set, promotes generator speed through the gear box, involves that transmission part is many, mainly has: the main shaft, the gear box, the coupler and the generator are flexibly connected, so that the generator of the gear box is poor in centering performance, the output shaft of the gear box is a high-speed rotating part, the stress characteristic is complex, and the actual operation failure rate is high. The offshore environment conditions are complex, the operation and maintenance difficulty and the cost are high, and the particularity of the offshore environment should be fully considered in the development of the design work of the wind generating set. In order to facilitate the hoisting of the wind generating set, the operational reliability of the wind generating set is improved, and the structure of the wind generating set is required to be compact.

Chinese patent CN103210214 proposes a medium speed integration scheme, which reduces the failure rate of the gear box by removing the high speed part, and the gear box and the generator adopt an integrated design, thereby avoiding the misalignment of the gear box, retaining the performance of the direct drive permanent magnet in the quality of electric energy, and reducing the weight and cost of the direct drive generator.

The relatively compact scheme proposed by Chinese patents CN 101702928 and CN 105240216 is that a gear box shell and a generator shell are arranged as load transmission components and are placed outside a cabin, the gear box, a main bearing, a generator and the cabin are connected through an ultra-long bolt, gear box oil and the main bearing share an oil circuit, and a connection inner cavity of the gear box and the generator is filled with oil. Load transfer path directly passes through gear box and generator among the above-mentioned scheme, and is higher to part strength design requirement, and the part hookup faying face is more simultaneously, leads to the faying face to warp easily among the load transfer process, easily takes place the oil leak, leads to overlength bolt to articulate the inefficacy, because the gear box generator is directly exposed in the air, 1/1 oil leakages will directly influence ground environment. Because the main bearing scheme will bear the load of all impeller ends, it is comparatively serious to the wearing and tearing of bearing raceway relative gear box inner part, and bearing and gear box common lubrication system will directly lead to wearing and tearing particulate matter to get into the gear box, influence the gear box meshing state.

In order to make the structure compact, chinese patents CN 101702928 and CN 10524021 integrate all units of equipment such as electrical cabinets, hydraulic stations, etc. in the cabin casting, but lose the requirement of maintenance space, and meanwhile, heat generated by the equipment running in the cabin is easy to accumulate and not easy to diffuse.

At present, the main bearing in the wind power industry is invalid, most reasons are that the roller and the roller path are in direct contact friction and an effective oil film cannot be established due to insufficient bearing lubrication and overhigh temperature rise. Grease is basically used for a main shaft system transmission bearing in the wind power industry, and the inherent characteristics of the grease determine that the fluidity and the cooling effect of the grease in a bearing inner cavity cannot be matched with those of thin oil lubrication.

Disclosure of Invention

In order to solve the technical problems, the invention provides the ultra-compact wind generating set which is simple in structure, compact in transmission structure, light in weight and small in cabin structural size.

The technical scheme adopted by the invention is as follows: an ultra-compact medium-speed permanent magnet wind generating set comprises a hub, a brake disc, a gear box, a generator, a cabin casting, a movable platform assembly, a heat dissipation system and a yaw system; the hub is connected with an input shaft of the gear box, a brake disc is arranged on a flange surface connected with the hub and the gear box and is connected to the gear box through a bolt, an output shaft of the gear box penetrates through the generator, and the end part of the output shaft of the gear box is connected with a generator rotor through a coupling; the movable platform assembly is arranged in the cabin casting and divides the cabin casting into an equipment cavity and a heat dissipation cavity; the gearbox is fixedly connected with the generator and then installed in the equipment cavity, and the heat dissipation system and the yawing system are installed in the heat dissipation cavity.

In the ultra-compact medium-speed permanent magnet wind generating set, the wheel hub is provided with the manhole, the cabin cover is arranged outside the cabin casting, and the manhole is communicated with the top of the cabin cover.

In the ultra-compact medium-speed permanent magnet wind generating set, the yaw system comprises a yaw drive and a yaw bearing, and the yaw bearing adopts a sliding type yaw bearing

In the ultra-compact medium-speed permanent magnet wind generating set, the gear box comprises a main bearing, a gear box shell, a primary planetary gear train and a secondary planetary gear train, wherein the wind direction side of the gear box shell is connected with an outer ring of the main bearing and an engine room casting through bolts, and the wind direction side of the gear box shell is connected with a stator shell of a generator through bolts;

the primary planetary gear train comprises a planet carrier, a primary gear ring, a planet gear, a sun gear and a primary output spline shaft, wherein the wind direction side of the planet carrier is connected with the inner ring of the main bearing through a bolt, the downwind side of the planet carrier is fixed on the shell of the gearbox through a planet carrier bearing, the primary gear ring is fixed in the shell of the gearbox, and the central hole of the sun gear is arranged on the primary output spline shaft through a spline; the planet carrier is connected with the hub through a flange;

the secondary planetary gear train comprises a planet carrier seat, a secondary planet carrier, a secondary planet gear, a secondary sun gear, a sun gear output shaft and a secondary gear ring, wherein the secondary planet carrier is arranged on the output spline shaft through a spline; the output shaft of the sun gear penetrates through the generator, and the end part of the output shaft of the sun gear is connected with a rotor of the generator.

In the ultra-compact medium-speed permanent magnet wind generating set, the generator comprises a stator shell, a rotor bracket, an end cover and a rotor bearing, wherein a stator shell is directly and rigidly connected with a gear box shell through bolts; the secondary planetary gear train of the gear box is arranged in an annular U-shaped inner cavity of a generator stator shell, the outer ring of the rotor bearing is fixed on a rotor support through bolts, and the rotor support is connected with the coupler and the rotor.

In the ultra-compact medium-speed permanent magnet wind generating set, the coupling is provided with the high-speed shaft brake disc, and the brake of the high-speed shaft brake disc is arranged on the end cover at the downwind side of the generator.

In the ultra-compact medium-speed permanent magnet wind generating set, a sealing flange is arranged between the main bearing and the cabin casting, an axial dynamic and static joint surface seal I is arranged on the wind direction side of the sealing flange and the inner ring of the main bearing, and an axial dynamic and static joint surface seal II is arranged on the downwind side of the inner ring of the main bearing and the shell of the gear box.

In the ultra-compact medium-speed permanent magnet wind generating set, the diameter of the inner ring of the sealing flange plate is larger than that of the inner ring of the main bearing connecting surface of the engine room casting.

In the ultra-compact medium-speed permanent magnet wind generating set, a dynamic and static joint surface seal is arranged between the planet carrier seat and the sun gear output shaft in the secondary planetary gear train.

In the ultra-compact medium-speed permanent magnet wind generating set, the movable platform assembly comprises a platform plate, a ladder stand, a guardrail, a platform supporting framework, a hydraulic station and a control cabinet, wherein the platform supporting framework is arranged on the bottom surface of the platform plate, and the ladder stand is arranged at the top of the tower barrel and between the platform plates; the hoisting device is arranged in the cabin casting, is arranged at the top of the cabin cover and is arranged between the tail end of the generator and the guardrail; the hydraulic station is connected with the control cabinet and used for supplying oil and lubricating the gearbox.

In the ultra-compact medium-speed permanent magnet wind generating set, the heat dissipation system comprises a generator water-air cooling heat dissipation system and an oil-air cooling heat dissipation system of the gear box, and the generator water-air cooling heat dissipation system and the oil-air cooling heat dissipation system of the gear box are respectively arranged on the left side and the right side of the bottom of the movable platform assembly.

Compared with the prior art, the invention has the beneficial effects that:

the hub of the invention is directly connected to the planet carrier of the gear box, the main bearing and the gear box are designed in an integrated mode, an oil inlet lubricating and cooling system is shared, the operating temperature of the main bearing is reduced, the operating efficiency of the bearing is improved, the oil return of the main bearing is an independent oil return system, and the influence of abrasion particles of the main bearing on the meshing of gears in the gear box is reduced. The gear box is in two-stage planetary transmission, the planet carrier is in a squirrel-cage structure mature in the industry, the planet carrier is supported by two arms, the rigidity of the planet carrier is improved, the output of the gear box is a long shaft and is integrated with the sun gear, and the uniform load of the sun gear is realized through the long output flexible shaft. The output shaft of the gear box passes through the generator and is reversely coupled to the rotor of the generator through a coupling. The generator is of a single bearing structure, the inner ring and the outer ring are connected to the stator and the rotor of the generator respectively in a bolt connection mode, and installation and later maintenance are convenient. The gearbox is fixedly connected with the generator and is suspended on the cabin casting, so that the load at the impeller end is transmitted to the cabin casting through the main bearing, and the load transmission path is prevented from passing through the gearbox and the generator. The whole engine room is internally provided with two layers, the upper layer is a movable platform, all equipment required by the running of all units is installed, the lower layer is a heat dissipation equipment installation layer, radiators required by the heat dissipation of the gear box and the generator are installed on the left side and the right side, and the air cooling mode of the radiators adopts a side conveying and side arranging mode. The yaw system adopts a sliding yaw bearing and is connected to the top of the tower barrel through bolts, and a certain number of yaw motors are installed on the engine room casting, so that yaw action is realized, and the wind requirement of the engine group is met. According to the compact type medium-speed permanent magnet wind generating set, the hub end is directly connected to the gear box, the adopted single bearing and no main shaft are simpler than the same scheme, the structure of the transmission chain is compact, and the arrangement mode of the movable platform assembly, the radiator system and the yawing system in the engine room meets the requirements of light weight of the set and small size of the engine room structure.

Drawings

FIG. 1 is a schematic view of the overall structure of the ultra-compact medium-speed permanent magnet wind generating set.

Fig. 2 is a schematic sectional view of a main transmission chain of the compact medium-speed permanent magnet wind generating set.

Fig. 3 is an enlarged view of a in fig. 2.

Fig. 4 is an enlarged view at B in fig. 2.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-2, the present invention includes a hub 1, a brake disk 18, a gearbox 3, a generator 4, a nacelle casting 2, a movable platform assembly 16, a heat dissipation system (including a gearbox heat dissipation system 10 and a generator heat dissipation system 9), a yaw system 14 (including a yaw drive 12 and a yaw bearing 45), a nacelle cover 5, and a lifting device 6. The hub 1 is used for mounting blades. The movable platform assembly 16 is installed in the cabin casting 2, and divides the cabin casting 2 into an equipment cavity and a heat dissipation cavity, and the equipment cavity is located above the heat dissipation cavity. The gearbox 3, the generator 4 and the hoisting device 6 are arranged in an equipment cavity, and the gearbox cooling system 10, the generator cooling system 9 and the yawing system 14 are arranged in the cooling cavity. Sliding type yaw bearing is adopted to slide bearing 45, compares roll formula yaw bearing, and the area of atress is big, and bearing capacity is strong, can reduce the cost of unit driftage system by a wide margin. The gearbox cooling system 10 and the generator cooling system 9 are respectively arranged on the left side and the right side of the bottom of the movable platform assembly 16, and the radiator air cooling structures of the gearbox cooling system 10 and the generator cooling system 9 adopt a side-feeding side-discharging mode to ensure that ventilation and heat dissipation in the engine room meet requirements. The nacelle cover 5 is arranged outside the nacelle casting 2.

The movable platform assembly 16 comprises a platform plate 11, a ladder 19, a guardrail 13, a platform supporting framework 15, a hydraulic station 8 and a control cabinet 7, wherein the platform supporting framework 15 is arranged on the bottom surface of the platform plate 11 and is used for supporting the safety requirements required when the whole movable platform assembly 16 is used for maintaining and installing relevant parts. The ladder 19 is arranged between the top of the tower and the platform plate 11. The hoisting device 6 is arranged at the top of the cabin cover 5, is arranged between the tail end of the generator 4 and the guardrail 13 of the movable platform assembly 16, and is used for hoisting related spare parts or equipment during maintenance.

The gearbox 3 comprises a main bearing 37, a gearbox shell 20, a primary planetary gear train and a secondary planetary gear train, the windward side of the gearbox shell 20 is connected with the outer ring of the main bearing 37 and the engine room casting 2 through bolts, and the leeward side of the gearbox shell 20 is connected with the stator shell of the generator 4 through bolts. The primary planetary gear train comprises a planet carrier 26, a primary gear ring 27, a planet gear 28, a sun gear 29 and a primary output spline shaft 30, the windward side of the planet carrier 26 is connected with an inner ring 24 of a main bearing 37 through a bolt, the downwind side of the planet carrier is fixed on the gearbox shell 20 through a planet carrier bearing, the primary gear ring 27 is fixed in the gearbox shell 20, and the central hole of the sun gear 29 is arranged on the primary output spline shaft 30 through a spline. The planet carrier 26 is connected to the hub 1 via a flange on which the brake disc 18 is arranged. The hub 1 is provided with a manhole which is communicated with the top of the cabin cover 5 and can directly enter the hub from the top of the cabin cover. The secondary planetary gear train comprises a planet carrier seat 36, a secondary planet carrier 31, a secondary planet wheel 33, a secondary sun gear 34, a sun gear output shaft 41 and a secondary gear ring 32, wherein the secondary planet carrier 31 is arranged on an output spline shaft through a spline, the windward side of the secondary planet carrier 31 is fixed on the gear box shell 20 through a bearing, the downwind side of the secondary planet carrier 31 is fixed on the planet carrier seat 36 through a bearing, two ends of the secondary gear ring 31 are respectively connected with the planet carrier seat 36 and the gear box shell 20, and the secondary sun gear 34 is arranged on the sun gear output shaft 41; the sun gear output shaft 41 passes through the generator, and the end of the sun gear output shaft 41 is connected with the generator rotor.

As shown in fig. 3 and 4, the oil circuit of the main bearing 37 includes an oil inlet valve 49, an oil inlet pipe 50, an oil return valve 53, an oil return pipe 54, a filter 55 and a filter pipe 56, the oil circuit of the gear box 3 includes an oil inlet valve 52, an oil return valve 59 and an oil return pipe 58, the oil circuit of the first-stage planetary gear train and the second-stage planetary gear train of the gear box 3 is lubricated and cooled by the oil inlet valve 52, the lubricated oil returns to the oil tank by the oil return valve 59 and the oil return pipe 58, the oil inlet pipe of the main bearing 37 is shared with the gear oil injection pipe of the gear box 3 and is realized by a three-way valve 51, the I-I end of the three-way valve 51 is connected to the I-I end of the hydraulic station by the oil pipe, the oil return pipe adopts a separate and independent mode, because the main bearing 37 of the gear box bears all loads at the impeller end, the main bearing 37 is worn, the generation of grinding particles is aggravated, the adopted common oil inlet way and the independent oil return way avoid the pollution of the oil tank by the grinding particles of the roller path, the oil liquid after lubricating the main bearing firstly passes through the filtering device 55 and then is connected to the oil return three-way valve 57 through the filtering pipeline 56, the two oil return flows jointly pass through the gear box heat dissipation system 10, and the O-O end of the oil return three-way valve 57 is finally connected to the O-O end of the hydraulic station, so that the circulating lubrication cooling of the oil way is realized. The planet carrier seat 36 and the sun gear output shaft 41 in the two-stage planetary gear train form dynamic and static joint surface sealing, so that oil in the gear box is prevented from flowing into a generator cavity.

The generator 4 comprises a stator shell 38, a rotor 39, a rotor bracket 40, an end cover 44 and a rotor bearing 42, wherein the stator shell 38 is directly and rigidly connected with the gearbox shell 20 through bolts, the wind direction side of the stator shell 38 adopts a U-shaped integrated structure, and is connected with the inner ring of the rotor bearing 42 through bolts; the secondary planetary gear train of the gear box is arranged in an annular U-shaped inner cavity of a stator shell 38 of the generator 4, the outer ring of a rotor bearing 42 is fixed on a rotor bracket 40 through bolts, and the rotor bracket 40 is connected with a coupler 43 and a rotor 39. The rotor bearing 42 is of a single-bearing structure, and may be implemented by using a three-row cylindrical roller bearing or a two-row tapered roller bearing. The generator 4 adopts a single-bearing structure, so that the influence of shaft current is avoided, and meanwhile, the rotor bearing 42 adopts an inner ring bolt connection mode and an outer ring bolt connection mode, so that the installation and the maintenance are convenient. A high-speed shaft brake disc may be provided on the coupling 43, and the brake of the high-speed shaft brake disc is mounted on the end cover 44 on the downwind side of the generator 4.

As shown in fig. 3, a sealing flange 23 is arranged between the main bearing 37 and the nacelle casting 2, an axial dynamic and static joint surface seal I46 is arranged between the sealing flange 23 and the windward side of the inner ring 24 of the main bearing 37, an axial dynamic and static joint surface seal ii 47 is arranged between the leeward side of the inner ring 24 of the main bearing 37 and the gearbox housing 20, and the axial dynamic and static joint surface seal ii 47 is formed by multiple non-contact seals. The diameter of the inner ring of the sealing flange plate 23 is larger than that of the inner ring of the connecting surface of the cabin casting 2 and the main bearing 37, so that an oil return groove 48 is conveniently formed in the sealing flange plate 23, and the phenomenon that the oil leakage of the axial dynamic and static joint surface seal 46 on the wind direction side of the main bearing 37 leaks to the bolt connecting joint surface of the cabin casting 2 to cause the connection failure is avoided.

Claims

1. The utility model provides an ultra-compact intermediate speed permanent magnet wind generating set which characterized in that: the system comprises a hub, a brake disc, a gearbox, a generator, a cabin casting, a movable platform assembly, a heat dissipation system and a yaw system; the hub is connected with an input shaft of the gear box, a brake disc is arranged on a flange surface connected with the hub and the gear box and is connected to the gear box through a bolt, an output shaft of the gear box penetrates through the generator, and the end part of the output shaft of the gear box is connected with a generator rotor through a coupling; the movable platform assembly is arranged in the cabin casting and divides the cabin casting into an equipment cavity and a heat dissipation cavity; the gearbox is fixedly connected with the generator and then installed in the equipment cavity, and the heat dissipation system and the yaw system are installed in the heat dissipation cavity;

the gearbox comprises a main bearing, a gearbox shell and a speed change mechanism, wherein the upper wind direction side of the gearbox shell is connected with an outer ring of the main bearing and a cabin casting through bolts, and the lower wind direction side of the gearbox shell is connected with a stator shell of a generator through bolts; the inner ring of the main bearing is connected with a speed change mechanism;

the gearbox is fixedly connected with the generator and then installed in the equipment cavity, and the heat dissipation system and the yaw system are installed in the heat dissipation cavity; the movable platform assembly comprises platform plates, a ladder stand, guardrails, a platform supporting framework, a hydraulic station and a control cabinet, wherein the platform supporting framework is arranged on the bottom surfaces of the platform plates, and the ladder stand is arranged at the top of the tower barrel and between the platform plates; the hoisting device is arranged in the cabin casting, is arranged at the top of the cabin cover and is arranged between the tail end of the generator and the guardrail; the hydraulic station is connected with the control cabinet and is used for supplying oil to and lubricating the gear box;

the oil circuit lubricating and cooling device of the main bearing comprises an oil inlet valve, an oil inlet pipeline, an oil return valve, an oil return pipeline, a filtering device and a filtering pipeline, the lubricating and cooling of the oil circuit of the gear box comprises an oil inlet valve, an oil return valve and an oil return pipeline, the lubricating and cooling of the oil circuit of the primary planetary gear train and the secondary planetary gear train of the gear box can realize the lubrication of each lubricating point through the oil inlet valve, the lubricated oil can return to the oil tank through the oil return valve and the oil return pipeline, the oil inlet pipeline of the main bearing is shared with the oil injection pipeline of the gear box, the three-way valve is connected to the hydraulic station through an oil pipe, an oil return pipeline of the main bearing and an oil return pipeline of the gear box adopt a separated independent mode, oil liquid lubricated by the main bearing firstly passes through a filtering device, then the oil is connected to an oil return three-way valve through a filter pipeline, the two oil return streams jointly pass through a gear box heat dissipation system, and the oil return three-way valve is connected to a hydraulic station.

2. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 1, wherein: the wheel hub on be equipped with the manhole, the cabin foundry goods outside is equipped with the cabin cover, crosses manhole and cabin cover top intercommunication.

3. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 1, wherein: the yaw system comprises a yaw drive and a yaw bearing, wherein the yaw bearing adopts a sliding type yaw bearing.

4. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 1, wherein: the speed change mechanism comprises a primary planetary gear train and a secondary planetary gear train; the primary planetary gear train comprises a planet carrier, a primary gear ring, a planet gear, a sun gear and a primary output spline shaft, wherein the wind direction side of the planet carrier is connected with an inner ring of the main bearing through a bolt; the planet carrier is connected with the hub through a flange;

5. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 1, wherein: the generator comprises a stator shell, a rotor bracket, an end cover and a rotor bearing, wherein a stator shell is directly and rigidly connected with a gearbox shell through bolts; the secondary planetary gear train of the gear box is arranged in an annular U-shaped inner cavity of a generator stator shell, the outer ring of the rotor bearing is fixed on a rotor support through bolts, and the rotor support is connected with the coupler and the rotor.

6. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 1, wherein: and a brake of the high-speed shaft brake disc is arranged on an end cover at the downwind side of the generator.

7. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 4, wherein: and a sealing flange is arranged between the main bearing and the cabin casting, an axial dynamic and static joint surface seal I is arranged on the wind direction side of the sealing flange and the inner ring of the main bearing, and an axial dynamic and static joint surface seal II is arranged on the downwind side of the inner ring of the main bearing and the shell of the gear box.

8. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 7, wherein: the diameter of the inner ring of the sealing flange plate is larger than that of the inner ring of the main bearing connecting surface of the engine room casting.

9. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 4, wherein: and a dynamic and static joint surface seal is arranged between the planet carrier seat and the sun gear output shaft in the secondary planetary gear train.

10. The ultra-compact medium speed permanent magnet wind turbine generator system of claim 1, wherein: the heat dissipation system comprises a generator water-air cooling heat dissipation system and an oil-air cooling heat dissipation system of the gear box, and the generator water-air cooling heat dissipation system and the oil-air cooling heat dissipation system of the gear box are respectively arranged on the left side and the right side of the bottom of the movable platform assembly.