CN206972436U - Vane change device and the wind power generating set with the vane change device - Google Patents

Abstract

The utility model provides a kind of vane change device for wind power generating set and the wind power generating set with the vane change device.The wind power generating set includes wheel hub and blade, the vane change device includes pitch variable bearings, cog belt and the drive mechanism for driving cog belt, the pitch variable bearings include bearing inner race and bearing outer ring, the bearing inner race includes the extension extended axially outwardly, the blade is fixedly connected with the extension, the bearing outer ring is fixedly connected with the wheel hub, and the cog belt is connected on the extension.According to vane change device of the present utility model and wind power generating set, it is possible to increase blade root ultimate bending moment load level, the safety coefficient of vane change device, reduce the failure risk of the failure risk of pitch variable bearings, the failure risk of cog belt and bolt.

Description

Pitch changing device and wind power generating set with the pitch changing device

technical field

The utility model relates to the technical field of wind power generation, in particular to a pitch changing device for a wind power generating set and a wind generating set with the pitch changing device.

Background technique

The wind turbine is a large-scale power generation device that converts wind energy into electrical energy through the rotation of the impeller. The wind turbine uses the pitch device to adjust the blade angle of the blade according to the change of wind speed to control the absorption of wind energy by the impeller.

Specifically, during the normal operation of the wind generator set, when the wind speed exceeds the rated wind speed of the wind generator set, in order to control the power output of the wind generator set, the blade angle of the blade is controlled by the pitch control device to be between 0° and 30°, Ensure that the rotational speed of the impeller is limited within the rated range, and realize shutdown by feathering the blades to a 90° position through the pitch control device, for example.

Fig. 1 shows a schematic diagram of a pitch control device in the prior art. FIG. 2 shows a partially cut-away side view of the pitch device in FIG. 1 . As shown in Figures 1 and 2, the pitch control device includes a pitch bearing 2. The pitch bearing 2 includes a bearing inner ring 21 and a bearing outer ring 22. The hub 1, which is the base of the wind power generating set, is connected to the pitch bearing 2 through the hub connecting bolts 7. The bearing inner ring 21 of the bearing 2 is fixedly connected, the blade 6 of the wind power generator is fixedly connected with the bearing outer ring 22 of the pitch bearing 2 through the blade connecting bolt 8, and the transmission belt 3 bypasses the drive mechanism 4, the tension pulley 31 and the transmission belt pretension The device 32 is tensioned on the outer cylindrical surface of the bearing outer ring 22 of the pitch bearing 2 . When it is necessary to perform the pitch operation, the driving mechanism 4 drives the transmission belt 3, thereby driving the bearing outer ring 22 of the pitch bearing 2 and the blade 6 of the wind power generating set relative to the bearing inner ring 21 of the pitch bearing 2 and the hub of the wind generating set 1 Rotate to realize the pitch change of the blade.

However, there are certain problems in the above-mentioned pitch control device. Specifically, in the case of blades of the same specification, the bending moments experienced by the blades are the same. Because the blade 6 is connected to the bearing outer ring 22 of the pitch bearing 2 in the prior art, the size of the pitch bearing 2 is smaller in the case of blades of the same specification, and the corresponding pitch bearing and hub connecting bolts 7, bearing steel The pitch circle diameter of the ball and the layout of the drive belt diameter are both small. Since the load is proportional to the magnitude of the bending moment and inversely proportional to the diameter of the pitch circle, under the same bending moment, the load on the steel ball and the load on the bolt are larger. This results in that the pitch bearing 2 bears a relatively large pitch load during the pitching process of the blade. Therefore, the bolts connected to the hub 1 of the pitch bearing 2 and the balls of the pitch bearing 2 are subject to relatively large loads, which may easily cause damage to the pitch bearing 2 itself and its components. Therefore, the pitch control device in the prior art has the problems of low safety factor of the pitch bearing ring, low safety factor of the pitch bearing and hub connecting bolts, and low safety factor of the transmission belt, thus easily failing.

Utility model content

In order to solve the above-mentioned problems in the prior art, the utility model provides a pitch changing device for a wind power generating set and a wind power generating set with the pitch changing device, the pitch changing device can improve the safety of each component of the pitch changing device coefficient to improve the safety performance of the pitch device.

According to an aspect of the present utility model, there is provided a pitch control device for a wind power generating set, the wind power generating set includes a hub and blades, and the pitch changing device may include a pitch bearing, a transmission element, and a device for driving the The driving mechanism of the transmission element, the pitch bearing includes a bearing inner ring and a bearing outer ring, the bearing inner ring includes an extension extending axially outward, the blade can be fixedly connected to the extension, the The bearing outer ring can be fixedly connected with the hub, and the transmission element can be arranged on the extension part.

According to an aspect of the present utility model, the inner ring of the bearing may have a plurality of axial through holes extending axially and arranged in the circumferential direction, and the plurality of axial through holes may extend through the extending portion, and the bearing The connecting bolts of the inner ring pass through the axial through holes and are fastened to the blades.

According to an aspect of the present invention, the extending portion may include an axially extending portion extending axially outward from the inner ring of the bearing, and a protruding structure disposed on an outer periphery of the axially extending portion.

According to an aspect of the present invention, the protruding structure may be formed separately from the axially extending portion, and the protruding structure is embedded into the outer periphery of the axially extending portion.

According to an aspect of the present invention, the protruding structure may include an insertion protrusion extending radially inward, and the outer periphery of the axially extending portion has a corresponding insertion groove.

According to an aspect of the present invention, the protruding structure may include a radially extending portion extending radially outward from the axially extending portion, and a drive shaft extending axially from the end of the radially extending portion. Component mounting section.

According to one aspect of the present utility model, the raised structure may have at least one of the following structural features: a lightening hole is formed in the raised structure; the raised structure is circular or partially circular ; The cross-sectional shape of the protruding structure in the radial direction is "-", "T" or "L".

According to an aspect of the present invention, the transmission element can be a transmission belt, a transmission chain or a steel rope, and the transmission element is wound on the outer circumferential surface of the extension part.

According to an aspect of the present invention, the transmission belt can be a toothed belt or a toothed chain.

According to an aspect of the present invention, a tooth-shaped structure may be formed on the outer peripheral surface of the extension part.

According to an aspect of the present invention, the extension part may be provided with a groove defining the installation position of the transmission element.

According to another aspect of the present utility model, a wind power generating set is provided, and the wind generating set includes the pitch control device as described above.

According to the pitch-changing device for wind power generators according to the embodiment of the present invention, under the condition that the specifications of the blades are the same, the size of the pitch-changing bearing used for the inner-ring pitch-changing through the inner-ring connection plate increases accordingly, and the diameter of the bolt pitch circle As the number of bolts increases, the distribution diameter of the transmission elements increases accordingly, which improves the anti-load capacity of the blade root, reduces the load on a single bolt, and reduces the load on the rolling elements of the bearing.

Therefore, the pitch control device for wind power generators according to the embodiment of the present utility model improves the ultimate bending moment load level of the blade root, improves the safety factor of the pitch bearing and the connecting bolts, and improves the safety of the inner ring and outer ring of the pitch bearing. factor and improve the safety factor of transmission components.

Description of drawings

The above-mentioned and/or other purposes and advantages of the present utility model will become more clear through the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 shows a schematic diagram of a pitch device in the prior art;

Fig. 2 shows a partially cut-away side view of the pitch control device in Fig. 1;

Fig. 3 is a perspective view of a pitch device according to a first embodiment of the present invention;

Fig. 4 is a partial cross-sectional view of the pitch device according to the first embodiment of the present invention;

Fig. 5 is a perspective view of the connection plate of the pitch control device according to the first embodiment of the present invention;

Fig. 6A is a partial sectional view of a pitch control device according to a second embodiment of the present invention;

Fig. 6B is a plan view of the connection plate of the pitch control device according to the second embodiment of the present invention;

Fig. 6C is a front sectional view of the connection plate of the pitch control device according to the second embodiment of the present invention;

7A and 7B are partial cross-sectional views of a pitch device according to a third embodiment of the present invention;

8A and 8B are partial cross-sectional views of a pitch device according to a fourth embodiment of the present invention;

9A and 9B are partial sectional views of a pitch control device according to a fifth embodiment of the present invention.

Detailed ways

Because the pitch control device in the prior art connects the blades with the bearing outer ring of the pitch control bearing and adopts an outer ring pitch change scheme, there is a problem of low safety factor of the pitch control device. In order to solve the above problems, the utility model proposes to adopt an inner ring pitch change scheme different from the outer ring pitch change scheme of the prior art, so that the blades are connected with the bearing inner ring of the pitch bearing, and driven by a transmission element (for example, a transmission belt). The blade and the inner ring of the bearing rotate at a predetermined angle relative to the outer ring of the bearing and the hub, so as to realize the rotation and pitch of the blade. Therefore, compared with the outer ring pitch change scheme of the prior art, under the same blade condition, that is, when the diameter of the blade root remains unchanged, since the blade root is connected to the inner ring of the bearing, the bearing inner ring and the outer ring of the bearing The size needs to be increased accordingly, and the diameter of the hub connecting flange should also be increased accordingly. Correspondingly, the pitch circle diameter of the bearing rolling elements, the layout diameter of the transmission elements, and the diameter of the connecting bolts can all be increased accordingly, so as to improve the performance of the pitch control device. The safety factor of each component improves the safety performance of the pitch control device.

Aiming at the pitch change scheme of the inner ring proposed by the utility model, this specification provides several exemplary implementations of how to realize the connection between the blade and the inner ring of the bearing and how to connect with the transmission element. Below, various specific embodiments of the present utility model will be described in detail with reference to the accompanying drawings.

first embodiment

Fig. 3 is a perspective view of the pitch device according to the first embodiment of the present invention. Fig. 4 is a partial sectional view of the pitch control device according to the first embodiment of the present invention. Fig. 5 is a perspective view of the connection plate of the pitch control device according to the first embodiment of the present invention.

As shown in FIG. 3 and FIG. 4 , the pitch control device according to the first embodiment of the present invention includes a pitch bearing 2 , a connecting plate 10 , a driving mechanism 4 and transmission elements. The pitch bearing 2 includes a bearing inner ring 21, a bearing outer ring 22, and rolling elements 23 (for example, balls or rollers) arranged between the bearing inner ring 21 and the bearing outer ring 22. The bearing outer ring 22 is sleeved on the bearing The outer periphery of the inner ring 21 is rotatable relative to the inner ring 21 of the bearing. The bearing outer ring 22 can be fixedly connected to the hub 1 through the bearing outer ring connecting bolts 7 , and the bearing inner ring 21 can be fixedly connected to the blade 6 through the bearing inner ring connecting bolts 8 . The connection disc 10 is located between the bearing inner ring 21 and the blade 6 .

The transmission mode between the driving mechanism 4 and the transmission element can adopt modes such as belt transmission, chain transmission, hoisting transmission, and steel rope transmission. Correspondingly, the transmission element may be a transmission belt, a transmission chain, a steel rope, etc., as long as the driving force can be transmitted to the blade 6 to make the blade 6 rotate. In the following description, the transmission element is a transmission belt as an example for description.

When the pitch control device is installed on the wind power generator set, the bearing outer ring 22 is fixedly connected to the hub 1 of the wind power generator set, and the connection disc 10 is fixedly connected between the bearing inner ring 21 and the blade 6 . More specifically, the first axial end of the connecting disc 10 contacts the bearing inner ring 21 , and the second axial end of the connecting disc 10 contacts the root end of the blade 6 . At the position corresponding to the flange connection through hole of the bearing inner ring 21, a corresponding axial through hole 14 (will be described in detail below) is provided on the connecting plate 10, and the bearing inner ring connecting bolts 8 pass through the bearing inner ring in turn 21 and the through hole on the connection plate 10, and then screwed into the threaded blind hole of the blade root of the blade 6, and after being tightened by the fastening nut, the bearing inner ring 21, the connection plate 10 and the blade 6 are fixedly connected together. The driving mechanism 4 is arranged on the hub 1 of the wind power generating set. The transmission belt 3 straddles the driving mechanism 4 and is sheathed on the outer circumference of the connection plate 10 . When the blade angle of the blade 6 needs to be adjusted, the driving mechanism 4 operates, and the transmission belt 3 drives the connection plate 10, the bearing inner ring 21 and the blade 6 to rotate a predetermined angle relative to the bearing outer ring 22 and the hub 1 under the drive of the driving mechanism 4, Thereby, the pitch of the blade 6 is realized.

In an embodiment according to the present utility model, the driving mechanism 4 is composed of a pitch-changing drive gear, and the pitch-changing device may also include a tension pulley 31, and the transmission belt 3 is tensioned on the connection plate 10 through the tension pulley 31 and the pitch-change drive gear 4. on the periphery.

As shown in FIGS. 3-5 , in the embodiment of the present invention, the connecting disc 10 is a circular disc-shaped structure. To facilitate the description of the structure of the connecting plate 10 , the connecting plate 10 can be divided into an inner peripheral portion 11 , an outer peripheral portion 13 , and an intermediate transition portion 12 connecting the outer peripheral portion 13 and the inner peripheral portion 11 along the radial direction.

As shown in FIG. 5 , a plurality of first axial through holes 14 are opened in the inner peripheral portion 11 , and the plurality of first axial through holes 14 extend along the axial direction and are evenly arranged along the circumferential direction. A plurality of second axial through holes (which may be threaded holes) corresponding to the plurality of first axial through holes 14 are provided on the bearing inner ring 21, and a plurality of corresponding threaded holes are provided at the blade root of the blade 6 , the threaded hole at the root of the blade 6 may be a blind hole. When connecting the bearing inner ring 21, the connecting disc 10 and the blade 6, align the bearing inner ring 21, the connecting disc 10 and the blade 6 coaxially, and align the threaded holes or through holes of the three in the axial direction accordingly, After the bearing inner ring connecting bolt 8 passes through the second axial through hole of the bearing inner ring 21 and the first axial through hole 14 on the connection plate 10 in sequence, it is screwed into the threaded hole of the blade 6 of the wind power generating set, and then The nuts are fastened to realize the fixed connection between the blade 6 of the wind power generating set and the bearing inner ring 21 of the pitch bearing 2 (as shown in FIGS. 3 and 4 ).

Furthermore, in the embodiment, the bearing outer ring 22 is provided with a plurality of threaded holes or through holes. The bearing outer ring connecting bolts 7 pass through the bearing outer ring 22 and are fastened to the corresponding threaded holes of the hub 1 of the wind power generating set, thereby realizing the fixed connection between the bearing outer ring 22 and the hub 1 of the wind generating set.

In addition to the above method of providing threaded holes at the root of the blade 6 , a circle of studs can also be pre-embedded at the root of the blade 6 , and the studs are arranged on the root of the blade 6 along the circumferential direction. When the blade 6 is connected to the connection plate 10 and the bearing inner ring 21, the stud of the blade 6 passes through the first axial through hole 14 of the connection plate 10 and the second axial through hole of the bearing inner ring 21 in sequence, and then passes through the Nuts are tightened.

Since the transmission belt 3 has a certain width, in order to meet the installation requirements of the transmission belt 3, the surface axial thickness of the outer circumferential part 13 of the connection plate 10 contacting the transmission belt 3 is greater than or equal to the width of the transmission belt 3, so the outer circumferential part 13 of the connection plate 10 It may be thicker; at the same time, in order to meet the strength requirements for the bolt connection with the blade 6 and the bearing inner ring 21, the thickness of the inner peripheral part 11 of the connection plate 10 connected with the bearing inner ring connecting bolt 8 may also be relatively large.

Therefore, in order to reduce the weight of the connecting plate 10 and save costs, the outer peripheral portion 13 of the connecting plate 10 can be formed into a non-circular structure, for example, the inner peripheral portion 11 is a full circular structure, and the intermediate transition portion 12 and the outer peripheral portion 13 Formed not as a full circle structure, but as a part of a ring. This is because the pitching angle of the blade 6 is between 0° and 30° during the actual pitching process of the blade 6, and the winding angle of the transmission belt 3 is shown in FIG. , so as long as the structure of the connecting plate 10 can meet the winding requirements of the transmission belt 3 . In this embodiment, the outer peripheral portion of the connection plate 10 is designed as a non-circular structure, which can save material cost and reduce the weight of the connection plate 10 . Obviously, in the actual implementation process, the connection plate 10 can also be designed as a full circle structure according to actual needs.

In addition, the intermediate transition portion 12 can also be arranged as a spoke-shaped structure, in other words, a plurality of spaced apart weight-reducing holes 15 can be arranged in the intermediate transition portion 12 of the connection plate 10, so as to further reduce the self-weight of the connection plate 10 .

In addition to the above-mentioned configurations, the intermediate transition portion 12 can also be set thinner, so that the axial thickness of the intermediate transition portion 12 is less than or equal to the axial thickness of the inner peripheral portion 11, or Less than or equal to the axial thickness of the inner peripheral portion 11 and the outer peripheral portion 13, so as to further reduce the weight of the connecting plate 10. In this case, the inner peripheral portion 11 and the outer peripheral portion 13 are generally cylindrical, and the cross-sectional shape taken along the radial direction of the land 10 may be approximately "I" or "Z".

In the present utility model, there are no special restrictions on the radial width and axial thickness of each part of the connection plate 10, as long as the connection plate 10 and the bearing outer ring 22 and the bearing outer ring are well connected during and after installation. It is sufficient that there is no interference between the connecting bolts 7 .

When assembling the pitch control device of this embodiment with the wind power generator set, the following method can be adopted: first, the bearing outer ring 22 is fixedly connected to the hub 1 of the wind power generator set through the bearing outer ring connecting bolt 7, and then the connecting plate 10 is placed In place, the bearing inner ring 21 is fixedly connected to the connecting plate 10 and the blade 6 of the wind power generator through the bearing inner ring connecting bolts 8, so that the installation sequence can avoid interference between the outer ring connecting bolts 7 and the connecting plate 10.

In an exemplary embodiment of the present invention, the outer circumference of the connection plate 10 and the transmission belt 3 rely on friction for transmission. Therefore, according to the needs, corresponding friction reduction treatment or friction increase treatment can be carried out on the outer peripheral surface of the connection plate 10, and the friction coefficient of the mating surface can be changed to meet the transmission requirements of different transmission belts and avoid friction between the transmission belt 3 and the connection plate 10. Risk of slippage.

Optionally, the drive belt 3 can be a toothed belt or a toothed chain, etc. In the case that the transmission belt 3 is a toothed belt or a toothed chain, a toothed structure can also be provided on the outer peripheral surface of the connection plate 10 to cooperate with the toothed belt or the toothed chain.

second embodiment

Fig. 6A is a partial sectional view of a pitch control device according to a second embodiment of the present invention. Fig. 6B is a plan view of the connection plate of the pitch control device according to the second embodiment of the present invention. Fig. 6C is a front sectional view of the connecting plate of the pitch control device according to the second embodiment of the present invention.

As shown in FIG. 6A , the pitch control device according to the second embodiment of the present invention also includes a connecting plate. 6B and 6C are schematic structural diagrams of the connection plate of the pitch control device according to the second embodiment of the present invention. Different from the pitch control device in the first embodiment, according to the pitch control device in the second embodiment of the present invention, the setting position and structure of the connecting plate 40 are changed. Except for the structure of the connection plate 40 and the blade 6, the structure of the pitch control device according to the second embodiment of the present invention is the same as the structure of the pitch control device according to the first embodiment, therefore, the description of the same parts is omitted here, and only the description Differences from the first embodiment.

As shown in Figures 6B and 6C, in the second embodiment of the present utility model, the connecting disc 40 may also be in the shape of an annular disc, and includes an inner circumferential part 41, an outer circumferential part 43 and a connection between the inner circumferential part 41 and the outer circumferential part. Section 43 of the intermediate transition section 42 . The inner circumferential portion 41 of the connection plate 40 is bonded to the blade 6 at a position close to the pitch bearing 2 . As an example, an insertion groove may be formed on the outer circumference of the blade root of the blade 6 , and the inner peripheral portion 41 of the connection disc 40 may be inserted into the insertion groove of the blade 6 . Bolt holes can be formed on the inner peripheral portion 41, and when the inner peripheral portion is inserted into the insertion groove of the blade 6, the connecting plate 40 can be pre-embedded and connected to the insertion groove of the blade root of the blade 6 through the inner ring connecting bolt 8. in the slot. The transmission belt 3 is connected to the outer peripheral surface of the connecting disc 40 through the transmission belt pretensioning device, so as to drive the blade 6 to rotate and pitch.

In order to facilitate the connection of the connecting disc 40 to the outer circumference of the blade root of the blade 6, the connecting disc 40 may be formed into a plurality of arc segments, which are spliced into a ring or a part of a ring when installed on the blade root. FIG. 6B shows that the land 40 is composed of two arc segments. The circumferential angle of each arc segment is less than or equal to 180 degrees. In order to facilitate the installation of the connecting plate 40, preferably, the connecting plate 40 can be composed of 3-6 arc segments.

A plurality of arc segment portions may be respectively embedded into insertion grooves of the blade root of the blade 6 in the radial direction. Preferably, the inner circumferential portion 41 of the connection plate 40 is formed with a plurality of insertion protrusions 44 extending in a radially inward direction and uniformly arranged along the circumferential direction. An axial through hole 45 may be formed on the insertion protrusion 44 for bolt connection with the blade 6 . The plurality of insertion protrusions 44 are embedded and connected to the insertion grooves of the blade 6 , and are fixedly connected to the blade 6 by bolts.

In the second embodiment, the connection method between the connection plate 40 and the blade 6 is not limited to the one shown in the figure, and a pin connection, wedge connection, seam positioning and other methods may also be used.

Similar to the connection plate 10 according to the first embodiment of the present utility model, in the case of meeting the installation requirements and strength requirements, the outer peripheral portion 43 of the connection plate 40 may not be formed as a full circle structure, and the intermediate transition portion may also be made The axial thickness of 42 is relatively thin, and lightening holes and the like are formed in the middle transition part. In addition, the cross-sectional shape taken along the radial direction of the land 40 may be approximately "I", "Z", "L" or "T".

The shape of the connection plate 40 is not limited to the shape shown in the figure and the shape described above, as long as the outer peripheral surface of the connection plate 40 can meet the matching requirements, installation requirements and strength requirements of the transmission belt.

third embodiment

7A and 7B show partial cross-sectional views of a pitch control device according to a third embodiment of the present invention. The pitch control device according to the third embodiment also includes a connection plate, but, unlike the first embodiment and the second embodiment, the connection plate and the blade 6 according to the third embodiment form an integral structure, that is, the inner The circumferential portion forms an integral structure with the blade root. In other words, the protruding structure 60 may be integrally formed on the outer peripheral surface of the blade root of the blade 6 instead of the connection plate in the first embodiment and the second embodiment. Of course, the protruding structure 60 may also be detachable from the outer peripheral surface of the blade root. The transmission belt 3 is connected to the outer peripheral surface of the protruding structure 60 through a pretensioning device, and directly drives the blade 6 to rotate and pitch.

The protruding structure 60 may include a radially extending portion extending radially outward from the outer periphery of the blade root, and the transmission belt 3 may be wound on the outer circumferential surface of the radially extending portion. Furthermore, the protruding structure 60 may also include an axially extending portion axially extending from the end of the radially extending portion, and the transmission belt 3 may be wound on the outer circumferential surface of the axially extending portion.

Similar to the connecting pads of the first embodiment and the second embodiment, the protruding structure 60 may also be formed into a circular ring or a partial circular ring, and the outer peripheral part of the protruding structure 60 may not be formed as a full circle structure, Lightening holes or the like may also be formed in the radially extending portion. The shape of the protruding structure 60 may be the same as or similar to that of the land 10 shown in FIG. 5 and the land 40 shown in FIG. 6B , and will not be described in detail here.

As shown in FIG. 7A , in the process of manufacturing the blade 6 , the same material as the blade is used to form the protruding structure 60 . Optionally, as shown in FIG. 7B , if the material for making the blade 6 cannot meet the strength requirements of the pitch operation, other suitable materials can be selected to process the blade root and the raised structure 60 so as to meet the strength requirements.

The shape of the protruding structure 60 according to this embodiment is not limited to the illustrated shape, as long as the outer peripheral surface of the protruding structure 60 can meet the matching requirements of the transmission belt. In order to meet the transmission requirements of different transmission belts, corresponding friction reduction or friction increase treatment can be performed on the outer peripheral surface of the protruding structure 60 to change the friction coefficient of the mating surface. Optionally, the transmission belt 3 can be a toothed belt or a toothed chain, therefore, a toothed structure can also be provided on the outer peripheral surface of the protruding structure 60 to cooperate with the toothed belt or the toothed chain.

Fourth embodiment

8A and 8B show partial cross-sectional views of a pitch control device according to a fourth embodiment of the present invention. Different from the first and second embodiments of the present invention, the pitch control device according to the fourth embodiment omits the connection plate, but similar to the third embodiment of the present invention, the transmission belt 3 is pre-tensioned by the transmission belt The device is directly connected to the root of the blade 6 to drive the blade 6 to rotate and pitch. However, different from the third embodiment, no protruding structure 60 is formed on the outer periphery of the blade root of the blade 6 , but the drive belt 3 is directly wound on the outer periphery of the blade root.

In order to further limit the range of cooperation between the blade 6 and the transmission belt 3, as shown in Figure 8B, a groove 601 or other similar treatment can be opened at the matching part of the blade root and the transmission belt, so that the transmission belt 3 is stably arranged in the groove 601 to prevent Transmission belt 3 moves up and down.

Similarly, the mating surface of the blade 6 and the transmission belt 3 can be treated with corresponding friction reduction or friction increase to change the friction coefficient of the mating surface. Optionally, the transmission belt 3 can be a toothed belt or a toothed chain, therefore, a toothed structure can also be provided on the outer circumferential surface of the blade root of the blade 6 to cooperate with the toothed belt or the toothed chain.

fifth embodiment

9A and 9B show partial cross-sectional views of a pitch control device according to a fifth embodiment of the present invention. Different from the above-mentioned embodiments according to the present utility model, the bearing inner ring 21 of the pitch bearing 2 extends outward in the axial direction beyond the predetermined length of the bearing outer ring 22, in other words, the bearing inner ring 21 faces in the axial direction The direction of the blade 6 is formed with extensions 210, 310, and the axial through holes on the bearing inner ring 21 also extend through the extensions 210, 310, so that the bearing inner ring connecting bolts 8 can pass through the bearing inner ring 21 and extend The parts 210 , 310 are then fastened to the blade 6 , thereby firmly connecting the blade 6 with the bearing inner ring 21 .

The transmission belt 3 is connected to the outer circumferential surfaces of the extensions 210 and 310 of the bearing inner ring 21 through a pre-tightening device to drive the bearing inner ring 21 to rotate, and the bearing inner ring 21 drives the blade 6 to rotate and change pitch.

As shown in FIG. 9A , the extension portion 210 may extend a predetermined length from the bearing inner ring 21 in the axial direction, and is generally cylindrical in shape. The predetermined length is greater than the width of the transmission belt 3 . In order to cooperate with the transmission belt 3 , the outer peripheral surface of the extension part 210 can be treated accordingly, for example, the outer peripheral surface can be subjected to friction-increasing or friction-reducing treatment. Optionally, the transmission belt 3 can be a toothed belt or a toothed chain, therefore, a toothed structure can also be formed on the outer peripheral surface to mesh with the toothed belt or the toothed chain.

As shown in FIG. 9B , the extension 310 is different from the extension 210 in FIG. 9A . The extension 310 further includes a raised structure on the basis of the extension 210 shown in FIG. 9A to further increase the pitch circle of the transmission belt 3 diameter.

As shown in FIG. 9B , the extension part 310 may include an axial extension part 312 and a protruding structure formed on the outer periphery of the axial extension part 312 .

The raised structure may include a radially extending portion 314 extending radially outward, and in this case, the drive belt 3 may be wound on an outer circumferential surface of the radially extending portion 314 . Further, the protruding structure may further include a transmission element mounting portion 316 axially extending from an end of the radially extending portion 314 , and the transmission belt 3 may be wound on an outer circumferential surface of the transmission element mounting portion 316 . The protruding structure can be integrally formed with the axially extending portion 312 , or can be formed as a separate component and inserted into the outer periphery of the axially extending portion 312 as in the connecting plate 40 shown in the second embodiment. For example, the inner circumference of the radially extending portion 314 can be formed with an insertion protrusion extending radially inward, and the outer circumference of the axially extending portion 312 can be formed with a corresponding insertion groove, so that the protrusion structure can be inserted into the protrusion and the insertion recess. The groove engages the axially extending portion 314 in a cooperating manner. Similar to the structure of the land 40 in the above-described embodiments, the cross-sectional shape of the protruding structure can be "-", "T" or "L". The protruding structure can be formed into a circular ring or a partial circular ring, and a lightening hole can also be formed on the radially extending portion 314 .

In other words, the embodiment shown in FIG. 9B can be obtained by integrating the connection plate 10 and the bearing inner ring 21 according to the first embodiment of the present invention. In other words, the pitch control device shown in FIG. 9B also includes a connection plate 80, which is integrally formed with the inner ring 21 of the bearing. the middle transition part. A plurality of axial through holes of the bearing inner ring 21 extend through the inner circumferential portion.

The connection plate 80 (i.e. the extension 310) shown in FIG. " or "Z" shape. Other structures of the pitch control device are the same as the corresponding components of the pitch control structure in the above-described embodiments, so no repeated description is given.

Although the above five embodiments have been described separately in conjunction with the accompanying drawings, it should be understood by those skilled in the art that the structural features described in one of the examples can be applied to other embodiments, and each feature is in different In case of mutual conflict, features in different embodiments can be combined with each other to form other variant embodiments. For example, in the example shown in Figure 8B, grooves are provided on the outer circumferential surface of the blade root to prevent the drive belt from moving up and down. Obviously, this method can also be applied to the pitch disc or extension in other embodiments. part.

The pitch changing device of the utility model can be applied to a wind power generating set, therefore, the utility model provides a wind generating set having the above pitch changing device.

According to the pitch changing device for a wind power generator set and the wind power generating set with the pitch changing device according to the embodiments of the present invention, when the specifications of the blades are the same, by connecting the blades to the inner ring of the bearing, the adopted The size of the pitch bearing increases accordingly, the diameter of the bolt pitch circle increases and the number of bolts increases, and the distribution diameter of the transmission belt increases accordingly, which improves the anti-load capacity of the blade root, reduces the load on a single bolt, and reduces the load on the bearing. load on the rolling elements.

Specifically, the pitch control device for wind power generators according to the embodiment of the present utility model improves the ultimate bending moment load level of the blade root, improves the safety factor of the pitch bearing and the connecting bolts, and improves the stability of the inner ring and outer ring of the pitch bearing. The safety factor and the improvement of the safety factor of the drive belt reduce the risk of fracture failure of the pitch bearing and the risk of fracture failure of the drive belt.

The above embodiments of the present invention are merely exemplary, and the present invention is not limited thereto. It should be understood by those skilled in the art that these embodiments can be changed without departing from the principle and spirit of the present invention, wherein the scope of the present invention is defined in the claims and their equivalents.

Claims (12)

1. A pitch-changing device for a wind power generating set, said wind generating set comprising a hub (1) and a blade (6), said pitch-changing device comprising a pitch-changing bearing (2), a transmission element and a blade for driving said pitch-changing device The driving mechanism (4) of the transmission element is characterized in that, The pitch bearing (2) includes a bearing inner ring (21) and a bearing outer ring (22), the bearing inner ring (21) includes an extension (210, 310) extending axially outward, and the blade (6) Fixedly connected with the extension part (210, 310), the bearing outer ring (22) is fixedly connected with the hub (1), and the transmission element is arranged on the extension part (210, 310) . 2. The pitch control device according to claim 1, characterized in that, the bearing inner ring (21) has a plurality of axial through holes extending in the axial direction and arranged in the circumferential direction, and the plurality of axial through holes The hole extends through the extension part (210, 310), and the bearing inner ring connecting bolt (8) is fastened to the blade (6) after passing through the axial through hole. 3. The pitch control device according to claim 1, characterized in that, the extension part (310) includes an axial extension part (312) extending axially outward from the bearing inner ring (21) and a set Raised formations on the periphery of said axially extending portion (312). 4. The pitch control device according to claim 3, characterized in that, the protruding structure is formed separately from the axially extending portion (312), and the protruding structure is embedded in the axially extending portion (312) ) of the periphery. 5. The pitch control device according to claim 4, characterized in that, the protruding structure comprises an insertion protrusion extending radially inward, and the outer periphery of the axially extending portion (312) has a corresponding insertion groove . 6. The pitch control device according to claim 3, characterized in that, the protruding structure comprises a radially extending portion (314) extending radially outward from the axially extending portion (312) and extending from the axially extending portion (312). The end portion of the radially extending portion (314) is an axially extending transmission element mounting portion (316). 7. The pitch control device according to claim 3, wherein the raised structure has at least one of the following structural features: Lightening holes are formed in the raised structure; The raised structure is circular or partially circular; The cross-sectional shape of the protruding structure in the radial direction is "-", "T" or "L". 8. The pitch control device according to any one of claims 1-7, characterized in that, the transmission element is a transmission belt, a transmission chain or a steel rope, and the transmission element is wound around the extension part (210, 310 ) on the outer circumferential surface. 9. The pitch control device according to claim 8, wherein the transmission belt is a toothed belt or a toothed chain. 10. The pitch control device according to claim 9, characterized in that, a tooth-shaped structure is formed on the outer peripheral surface of the extension part (210, 310). 11. The pitch control device according to claim 8, characterized in that, the extension part (210, 310) is provided with a groove defining the installation position of the transmission element. 12. A wind generating set, characterized in that the wind generating set comprises the pitch control device according to any one of claims 1-11.