CN111894794A - Two-blade wind generating set hub - Google Patents
Two-blade wind generating set hub Download PDFInfo
- Publication number
- CN111894794A CN111894794A CN202010945958.3A CN202010945958A CN111894794A CN 111894794 A CN111894794 A CN 111894794A CN 202010945958 A CN202010945958 A CN 202010945958A CN 111894794 A CN111894794 A CN 111894794A
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- hub
- flange
- variable
- main shaft
- pitch bearing
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- 238000000034 method Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 29
- 230000007704 transition Effects 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 4
- 230000008719 thickening Effects 0.000 claims description 4
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0691—Rotors characterised by their construction elements of the hub
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a two-blade wind generating set hub, wherein a front-end process hole is formed in the front end of the hub, a main shaft connecting flange is arranged at the rear end of the hub, and two same variable-pitch bearing connecting flanges are oppositely arranged on the top surface and the bottom surface of the hub. The included angle of the flange surfaces of the two variable-pitch bearing connecting flanges is equal to the cone angle of the wind wheel, the arc which is tangent to the axes of the flange surfaces of the two variable-pitch bearing connecting flanges is used as the central line of the hub, and then the flange surfaces are scanned along the central line of the hub to form a bent tubular structure as the main profile of the hub. The curve profile disperses stress, which is beneficial to lightweight design. Furthermore, the hub web is adopted to reinforce the variable-pitch bearing flange, so that the service life of the variable-pitch bearing is prolonged, and meanwhile, the mounting interfaces of the variable-pitch system and accessories are provided. In addition, the design of variable wall thickness is adopted, the front end is thin-walled, the rear end main shaft is thick near the connecting flange, and the weight of the hub is reduced on the premise of meeting the strength.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a two-blade wind generating set hub.
Background
In a wind turbine generator system, a hub is an important component for connecting a blade and a nacelle, and transmits wind energy captured by the blade to a main shaft. The hub is required to bear certain load and is connected with the blades or the variable pitch bearing, the fan main shaft and the air guide sleeve, so that the structure of the hub is a key factor for determining long-term safe and reliable operation of the wind generating set.
The conventional rigid hub structure of the two-blade hub is in a T-shaped shape similar to a three-way joint, the hub is in linear transition, the stress change is severe, the service life of the hub is greatly shortened, and the safety problem is brought. If the bearing problem is solved by simply increasing the wall thickness of the hub, the weight of the hub is greatly increased, the manufacturing cost is increased, and the installation difficulty is increased.
Disclosure of Invention
In order to solve the problems of concentrated stress and heavy weight of the hub in the prior art, the invention provides the following technical scheme:
a two-blade wind generating set hub is provided with a front-end process hole at the front end, a main shaft connecting flange is arranged at the corresponding rear end, the hub is connected with a main shaft of a generator or a gear box through the main shaft connecting flange, and a flow guide cover can be installed in the front-end process hole; two same variable-pitch bearing connecting flanges are oppositely arranged at the top and the bottom of the hub, and the variable-pitch bearing connecting flanges are connected with the wind wheel blades through variable-pitch bearings; the flange surfaces of the two variable-pitch bearing connecting flanges are not parallel but form a certain included angle, and the size of the included angle is set according to the cone angle of the wind wheel; and taking an arc tangent to the axes of the flange surfaces of the two pitch bearing connecting flanges as a central line of the hub, taking the central line of the hub as a scanning path, taking the flange surfaces of the pitch bearing connecting flanges as scanning profiles, and taking a bent tubular structure formed by scanning as a main profile of the hub. Obviously, the main profile curvature and the center line curvature are equal and are also determined by the rotor cone angle. The smooth curve profile can play a role in stress dispersion, and is favorable for lightweight design.
In addition, because the high stress area is arranged near the main shaft connecting flange, the curved surface transition is also adopted between the main shaft connecting flange and the hub main body part, and the stress concentration at the position can be further reduced.
Furthermore, the inner side of each variable pitch bearing connecting flange is provided with a hub web, the variable pitch bearing flange can be reinforced by the hub web, the service life of the variable pitch bearing is prolonged, the variable pitch bearing is suitable for installation of an internal tooth transmission variable pitch system, and an installation interface of the variable pitch system and an accessory is provided.
Furthermore, blade root bolt mounting process holes corresponding to the blade root bolts one to one are uniformly distributed on the circumferential position of the hub web plate, and the blade root bolts can be conveniently mounted through the process holes.
The blade root bolt mounting process holes distributed on the hub web plate are flexible in position, shape and number, can be set into single process holes with the same number as the blade root bolts in a one-to-one correspondence mode, can also adopt a structure of the multi-blade root bolt mounting process holes, namely arc-shaped or linear long-strip-shaped process holes can be adopted to replace the single process holes, the length of each long-strip-shaped process hole is the length of a plurality of single holes, the width of each long-strip-shaped process hole is not smaller than the diameter of each single process hole, and a plurality of blade root bolts can be screwed in one long-strip-shaped process hole. The elongated fabrication holes can be uniformly distributed along the circumference of the hub web, and the number of the elongated fabrication holes can be 1/2, 1/3, 1/4 and the like of the number of the blade root bolts, so that the strength of the hub web is not influenced, and the blade root bolts are convenient to disassemble and assemble. No matter a single process hole or a long-strip process hole is adopted, in order not to influence the strength of a hub web plate, local thickening can be adopted at the edge of the hole.
Furthermore, the main shaft connecting flange adopts an inner flange structure design and is connected by the stud, so that the connecting bolts for the hub and the main shaft can be installed and maintained inside the hub, and the operation is more convenient and safer. In addition, the main shaft connecting flange can also adapt to two different connecting structures of a flange bolt hole and a flange threaded hole.
Furthermore, the hub web plate is provided with two variable pitch drive mounting holes close to the circumferential position, one variable pitch drive mounting hole is used for variable pitch drive mounting, the other variable pitch drive mounting hole is standby, and when the gear teeth of the variable pitch bearing part are damaged, the variable pitch drive is replaced to a standby mounting position; if two pitch drive mounting holes are arranged, the two holes cannot be too close together, and are generally spaced at an angle of not less than 90 ° so as not to affect the strength and balance of the hub web.
Furthermore, maintenance personnel can be arranged on the hub web through holes and other accessory mounting bosses and process holes to provide mounting interfaces of the pitch system and accessories.
In addition, a lifting appliance mounting interface, a personnel passage hole and a corresponding guardrail mounting interface can be arranged on the outer side surface of the hub, so that personnel can conveniently come in and go out and mount the lifting appliance and the guardrail; the guardrail mounting interface is arranged near the personnel passage hole, so that the guardrail mounting interface can play a role in protecting when entering or exiting the personnel passage hole.
The general sling mounting interface is one and is usually arranged at a position far away from a main shaft connecting flange; the personnel access holes and the guardrail mounting interfaces can be arranged into two groups, and the two groups are symmetrically arranged at the positions close to the main shaft connecting flange. The personnel access hole can adopt a circular or elliptical hole, thereby facilitating casting and reducing stress concentration. The positions of the hanger installation interface, the personnel passage hole and the guardrail installation interface can be changed and adjusted according to the requirements.
Furthermore, the hub is integrally cast and formed by ductile cast iron, the wall thickness is changed, the region with low stress at the front end of the hub is thin-walled, and the high-stress part near the main shaft connecting flange at the rear end of the hub is thick-walled. So that the bearing not only can bear larger load, but also can reduce the whole weight.
The invention has the following outstanding advantages:
1. this patent adopts the curve profile to form the wheel hub main part, and the profile transition is smooth-going, has reduced stress concentration, does benefit to wheel hub's lightweight design.
2. This patent adopts the wheel hub web to strengthen becoming oar bearing flange, does benefit to and improves and becomes oar bearing life-span, is fit for the driven oar system installation that becomes of internal tooth simultaneously, provides the installation interface that becomes oar system and annex.
3. This patent has set up blade root bolt installation fabrication hole on the wheel hub web, and is further, blade root bolt fabrication hole can adopt the design of many root bolt installation fabrication hole, and the installation of realization blade root bolt that can be convenient adopts hole limit local thickening simultaneously, solves the not enough problem of intensity that trompil stress concentration arouses.
4. The main shaft connecting flange adopts an inner flange, so that the connecting bolt of the hub and the main shaft can be installed and maintained in the hub, and the operation safety is improved; in addition, the main shaft connecting flange adopts an inner flange and can also adapt to two different connecting structures of a flange bolt hole and a flange threaded hole.
5. The side of the wheel hub is provided with a lifting appliance mounting interface, a personnel passage hole and a guardrail mounting interface, so that personnel can conveniently come in and go out and mount the lifting appliance and the guardrail.
Drawings
Fig. 1 is a schematic perspective view of a two-blade wind turbine generator hub according to an embodiment of the present invention.
Fig. 2 is a front view of a hub of a two-blade wind turbine generator system according to an embodiment of the present invention (a spreader mounting interface is omitted in the figure for more clearly showing a curvature of a center line).
Fig. 3 is a right side view of a two-blade wind turbine generator system hub according to an embodiment of the present invention.
Fig. 4 is a left side view of a two-blade wind turbine generator system hub according to an embodiment of the present invention.
Fig. 5 is a sectional view taken along line a-a of fig. 4.
Fig. 6 is a sectional view taken along line B-B of fig. 4.
In the figure: the structure comprises a main shaft connecting flange 1, a front end process hole 2, a pitch bearing connecting flange 3, a hub web 4, a personnel passage opening 5, a lifting appliance mounting interface 6, a guardrail mounting interface 7, a personnel maintenance passage hole 8, a blade root bolt mounting process hole 9, a pitch driving mounting hole 10, a flange face included angle 11, a center line curvature 12 and a contour curvature 13.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is a schematic perspective view of an embodiment of the present invention, and fig. 2 is a front view of the schematic perspective view, wherein the spreader mounting interface 6 is omitted from fig. 2 in order to more clearly show the centerline curvature 12. In the hub of the two-blade wind generating set shown in the figure, the hole at the front end is a front-end process hole 2, a threaded hole is formed in the front-end process hole and can be connected with a fairing, and the rear end of the hub is a main shaft connecting flange 1; the hub is connected with a generator main shaft or a gear box through a main shaft connecting flange 1; two same variable-pitch bearing connecting flanges 3 are arranged at the top and the bottom of the hub in opposite positions, and each variable-pitch bearing connecting flange 3 is connected with a wind wheel blade through a variable-pitch bearing; the flange surfaces of the two pitch bearing connecting flanges 3 are not parallel but form a certain included angle, and fig. 2 shows an included angle 11 between the two flange surfaces, and the included angle is equal to the wind wheel cone angle; and taking an arc tangent to the axes of the flange surfaces of the two pitch bearing connecting flanges as a central line of the hub, taking the central line of the hub as a scanning path, taking the flange surfaces of the pitch bearing connecting flanges as scanning profiles, and taking a bent tubular structure formed by scanning as a main profile of the hub. An arc tangent to the flange surface axes of the two pitch bearing connecting flanges 3 at the same time is used as a central line, a bent tubular structure is formed by scanning along the path of the central line to be used as a main profile of the hub, obviously, the profile curvature 13 is equal to the central line curvature 12, and therefore, the profile curvature 13 is also determined by the wind wheel cone angle. The smooth curve profile can play a role in stress dispersion, and is favorable for lightweight design.
In addition, at the contour main body portion where the main shaft connecting flange 1 is connected to the hub, a curved surface transition is provided, and stress concentration at that portion can be further reduced.
A hub web 4 is arranged on the inner side of each variable-pitch bearing connecting flange 3, blade root bolt mounting process holes 9 corresponding to blade root bolts one by one are uniformly distributed on the circumferential position of the hub web, and the process holes are shown in fig. 1, 5 or 6; in addition, the blade root bolt mounting process holes 9 can also be designed into multiple blade root bolt mounting process holes, namely arc-shaped or linear long-strip-shaped process holes can be adopted, and a plurality of blade root bolts can be screwed in one long-strip-shaped process hole. No matter a single hole or a strip-shaped hole is adopted, in order not to influence the strength of a hub web plate, local thickening can be adopted at the hole edge.
Fig. 4 is a left side view of an embodiment of the present invention. Fig. 5 is a sectional view taken along line a-a of fig. 4. Fig. 6 is a sectional view taken along line B-B of fig. 4. As can be seen from the sectional views of fig. 5 and 6, the main shaft connecting flange 1 is an inner flange, which is provided with bolt holes and can be connected with a flange of the main shaft or the gearbox part through stud bolts. In addition, the bolt holes in the main shaft connecting flange can be set to be threaded blind holes, and the connection between the hub and the main shaft can be connected through the flange threaded hole structure.
As shown in FIGS. 1 and 6, two pitch drive mounting holes 10, a personnel maintenance access hole 8, and bosses and tooling holes for mounting the pitch system and other accessories are also arranged on the hub web.
As can be seen from fig. 1 to 6, on the outer side of the hub, there are also provided a spreader mounting interface 6, personnel access holes 5 and a guardrail mounting interface 7. The sling mounting interface 6 is arranged at a position far away from the main shaft connecting flange 1, and referring to fig. 1, the personnel passage hole 5 and the corresponding guardrail mounting interface 7 are arranged at a position close to the main shaft connecting flange 1. Of course, the positions of the spreader mounting interfaces 6, the personnel access holes 5 and the guardrail mounting interfaces 7 can also be adjusted as required.
In addition, the hub is integrally cast and formed by ball-milling cast iron, the design of variable wall thickness is adopted, the region with low stress at the front end of the hub is thinner in wall thickness, and the high-stress part near the main shaft connecting flange 1 at the rear end of the hub is thicker in wall thickness.
The above-mentioned embodiments are only for the purpose of illustrating and explaining the preferred embodiments of the technical solution and the working principle of the present invention, and in fact, the embodiments of the present invention have many different forms and combinations, which are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, simplifications, which are made without departing from the spirit and principle of the present invention, should be regarded as equivalents, and all of them are included in the protection scope of the present invention.
Claims (10)
1. A two-blade wind generating set hub is characterized in that a front-end process hole (2) is formed in the front end of the two-blade wind generating set hub, a main shaft connecting flange (1) is arranged at the corresponding rear end of the two-blade wind generating set hub, and the hub is connected with a main shaft or a gear box of a generator through the main shaft connecting flange (1); the top and the bottom of the hub are oppositely provided with two same variable-pitch bearing connecting flanges (3), and the two variable-pitch bearing connecting flanges (3) are respectively connected with the wind wheel blade through two variable-pitch bearings; the variable-pitch bearing connecting flange is characterized in that the included angle (11) of the flange surfaces of the two variable-pitch bearing connecting flanges is equal to the cone angle of the wind wheel; and taking an arc tangent to the axes of the flange surfaces of the two variable-pitch bearing connecting flanges (3) as the central line of the hub, and scanning the flange surfaces along the central line of the hub to form a bent tubular structure as the main profile of the hub.
2. The hub of a two-bladed wind turbine according to claim 1, characterized in that the main shaft connecting flange (1) presents a smooth curved transition with the main portion of the hub.
3. The two-blade wind generating set hub according to claim 1, wherein a hub web (4) is arranged on the inner side of each pitch bearing connecting flange (3), and blade root bolt mounting process holes (9) corresponding to blade root bolts in a one-to-one mode are uniformly distributed in the circumferential position of the hub web.
4. A two-bladed wind turbine hub according to claim 3, characterised in that said blade root bolt-mounting portholes (9) are elongated multi-blade root bolt-mounting portholes, with a local thickening of the edge of the hole.
5. The hub of a two-bladed wind turbine according to claim 4, characterized in that said hub web (4) is provided with two pitch drive mounting holes (10) close to the circumferential portion and with personnel maintenance access holes (8) close to the central portion.
6. A two-bladed wind turbine hub according to any of claims 1 or 2, characterized in that said main shaft connecting flange (1) is an internal flange, and the connection of said hub to the main shaft or the gearbox can be made by two different connecting structures, flange bolt holes or flange threaded holes.
7. A two-bladed wind turbine hub according to claim 1, characterized in that on the outer side of the hub there is a spreader mounting interface (6).
8. A two-bladed wind turbine hub according to claim 7, characterized in that it is provided with personnel access holes (5) and corresponding guard rail mounting interfaces (7) on the outer lateral surface.
9. The hub of a two-bladed wind turbine according to claim 8, characterized in that said spreader mounting interface (6) is one, arranged at a distance from the main shaft connection flange (1); the personnel passage holes (5) and the corresponding guardrail mounting interfaces (7) are two groups, and the two groups are symmetrically arranged at the position close to the main shaft connecting flange (1).
10. The hub of two-bladed wind turbine generator system according to any of claims 1, 2, 3, 4, 5, 7, 8, 9, characterized in that it is of variable wall thickness design, cast in one piece with ductile iron, the front-end tooling holes (2) area being thinner than the hub rear-end main shaft connecting flange (1) area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010945958.3A CN111894794A (en) | 2020-09-10 | 2020-09-10 | Two-blade wind generating set hub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010945958.3A CN111894794A (en) | 2020-09-10 | 2020-09-10 | Two-blade wind generating set hub |
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| Publication Number | Publication Date |
|---|---|
| CN111894794A true CN111894794A (en) | 2020-11-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010945958.3A Pending CN111894794A (en) | 2020-09-10 | 2020-09-10 | Two-blade wind generating set hub |
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| CN (1) | CN111894794A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464385A (en) * | 2021-07-26 | 2021-10-01 | 三一重能股份有限公司 | Wind driven generator hub structure and wind driven generator |
-
2020
- 2020-09-10 CN CN202010945958.3A patent/CN111894794A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464385A (en) * | 2021-07-26 | 2021-10-01 | 三一重能股份有限公司 | Wind driven generator hub structure and wind driven generator |
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