CN218235873U - Main shaft connecting structure of fan - Google Patents

Abstract

The utility model provides a fan main shaft connection structure, include: a main shaft configured to coaxially surround at least a partial column section of the gearbox input shaft; and a lock outer ring configured to coaxially surround at least part of the column sections of the main shaft and the gearbox input shaft, wherein contact surfaces of at least part of the column sections of any two of the main shaft, the gearbox input shaft and the lock outer ring are in interference fit.

Description

Main shaft connecting structure of fan

Technical Field

The utility model relates to a aerogenerator technical field, in particular to fan main shaft connection structure.

Background

The advantage of the power generation device which can run for a long time without the operation of personnel for the wind driven generator is more and more obvious. The main shaft of a wind turbine is an important component, which functions to transmit the torque of the rotor to the gearbox. The planet carrier of the wind power gear box is generally connected with the main shaft through a locking disc or a flange so as to transmit the torque of the main shaft to the planet carrier. For example, through the locking of the inner ring and the outer ring of the locking disc, the holding force is gradually applied to the contact surface of the planet carrier of the gear box and the main shaft, and the torque transmission is realized. When the external load is large, the parameters of the inner ring and the outer ring are required to be redesigned to realize the transmission of the large load.

At present, two modes are adopted for the connection transmission of a wind power main shaft 1, a transmission shaft and a wind power gear box 2 of a wind generating set, fig. 1 is a schematic sectional structure diagram of the assembly of the main shaft, a planet carrier and a locking disc in the prior art, the connection of the wind power main shaft shown in fig. 1 is that the locking disc adopts an inner ring 3 and an outer ring 4 to sleeve, the wind power main shaft is locked in a key-free connection mode, and is fixed by a locking bolt 5. The connection of the main shaft and the planet carrier needs to generate axial force through a locking disc bolt to tighten the inner ring and the outer ring of the locking disc to form conical surface positive pressure which acts on the inner ring of the locking disc and the planet carrier, and the planet carrier shaft sleeve deforms after receiving the positive pressure from the locking disc and releases the force to the main shaft to tightly hold the main shaft to achieve the purpose of transmitting torque.

Specifically, the inner hole of the outer ring 4 is provided with steps and an inner conical surface, and threaded holes are uniformly distributed on the steps; the outer circle of the inner ring 3 is provided with a flange and an outer conical surface, and the flange is provided with screw through holes with the same number as the threaded holes on the outer ring ladder; the flange and the outer circular conical surface of the inner ring are assembled with the step and the inner circular conical surface of the outer ring in a matching way; the fitting surface of the inner ring 3 and the outer ring 4 is a conical surface, under the action of the pretightening force of the locking bolt 5, contact pressure is generated between the conical surfaces of the inner ring 3 and the outer ring 4, and the pressure can be transmitted between the planet carrier 2 and the main shaft 1, so that the purpose of transmitting the torque of the main shaft 1 to the planet carrier 2 is realized.

In the assembling structure of the main shaft 1, the planet carrier 2 and the locking disc, because the inner ring 3 of the locking disc is in clearance fit with the planet carrier 2, and the inner ring 3 of the locking disc has certain rigidity, the pressure finally transmitted between the main shaft 1 and the planet carrier 2 is reduced, and the capacity of transmitting torque between the main shaft 1 and the planet carrier 2 is reduced. Accordingly, there is a need for improvements and developments in the art.

In addition, when the wind generating set is installed, the locking disc is sleeved on the shaft sleeve, the main shaft is inserted into an inner hole of the shaft sleeve, and the locking disc is locked by the fastening bolt; the processed blank is huge, the material is wasted, the installation is complex, the mutual matching difficulty of the hoisting and the connection operation is large due to the heavy hoisting weight, and the installation precision is difficult to control;

another structure is that a locking disc is not used, as shown in fig. 2 (a) - (b): the large flanges are respectively connected with the output shafts of the fan main shaft 1 and the fan gear box 2 through flange connection, the two flanges are connected through the bolts 3, and the structural form of transmission is that the weight of the fan main shaft and the large flanges is large, so that the difficulty of balanced hoisting and butt joint operation is increased.

According to the connection scheme, after positive pressure is formed between the inner ring and the outer ring of the locking disc, the main shaft is connected through the planet carrier. Creating a second decay in the positive pressure. In order to realize larger torque transmission capacity, the specification of the locking disc, the specification of the bolts and the quantity arrangement all need to meet certain design requirements: the current design scheme needs enough bolts and increases the specification of the locking disc to ensure positive pressure;

with the increase of the requirement of the transmission torque, after the number of the bolts which can be arranged on a certain reference circle diameter reaches the upper limit, and the diameter width of the locking disc reaches the upper limit, the capacity of further improving the transmission torque capacity is limited.

As gearbox torque density increases, the reliability of the torque transmission capability becomes less and less reliable and cannot be addressed at lower cost by conventional approaches. The reasons include: 1) In a fixed space, the locking disc cannot meet the torque transmission capacity; 2) The increase space of the number of bolts is limited under the fixed reference circle diameter; 3) Increasing the low speed space increases more cost.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fan main shaft connection structure to solve the problem that can not satisfy the load demand of being connected of current wind-powered electricity generation gear box planet carrier and main shaft.

In order to solve the technical problem, the utility model provides a fan main shaft connection structure, include:

a main shaft configured to coaxially surround at least a partial column section of the gearbox input shaft; and

a lock outer ring configured to coaxially surround at least part of the column sections of the main shaft and the gearbox input shaft, wherein contact surfaces of at least part of the column sections of any two of the main shaft, the gearbox input shaft, and the lock outer ring are in interference fit.

Optionally, in the connection structure of the main shaft of the wind turbine, the input shaft of the gear box includes:

a first hollow cylindrical section configured such that an outer side surface is in contact with an inner side surface of the main shaft;

a second hollow cylindrical section configured such that an outer side surface contacts an inner side surface of the locking outer ring; and

a third hollow cylindrical section configured to be located at an end distal from the main shaft.

Optionally, in the fan main shaft connecting structure,

the inner diameters of the first hollow cylindrical section, the second hollow cylindrical section and the third hollow cylindrical section are the same;

the outer diameters of the first hollow cylindrical section and the second hollow cylindrical section are the same;

the outer diameter of the first hollow cylindrical section is smaller than the outer diameter of the third hollow cylindrical section.

Optionally, in the fan main shaft connecting structure, the main shaft includes:

a ring cylindrical section configured to connect with the lock outer ring and a partial cylindrical section of the gearbox input shaft; and

the irregular cylindrical section is configured to be located at one end far away from the input shaft of the gear box, and the inner side surface and the outer side surface are formed by splicing a conical surface, a wedge-shaped cylindrical surface and/or an arc surface.

Optionally, in the fan spindle connecting structure, the outer side surface of the circular cylindrical section is a conical surface, the outer diameter of the circular cylindrical section is gradually increased from the input shaft of the gear box to the irregular cylindrical section, and the inner diameter of the circular cylindrical section is kept unchanged;

the outer axial tangent of the circular cylindrical section and the inner axial tangent of the circular cylindrical section form an included angle of 0-20 degrees.

Optionally, in the fan spindle connecting structure, the locking outer ring includes:

a fourth hollow cylindrical section configured to surround the second hollow cylindrical section; and

a fifth hollow cylindrical section configured to surround the annular cylindrical section;

wherein the annular cylindrical section surrounds the first hollow cylindrical section; the outer diameter of the fourth hollow cylindrical section is the same as that of the fifth hollow cylindrical section; the inner diameter of the fourth hollow cylindrical section is greater than the inner diameter of the fifth hollow cylindrical section.

Optionally, in the connecting structure of the main shaft of the blower, an inner side surface of the fifth hollow cylindrical section is a conical surface, an inner diameter of the fifth hollow cylindrical section is gradually increased from an input shaft of the gearbox to the irregular cylindrical section, and an outer diameter of the fifth hollow cylindrical section is kept unchanged;

an included angle of 0-20 degrees is formed between the outer axial tangent of the fifth hollow cylindrical section and the inner axial tangent of the fifth hollow cylindrical section.

Optionally, in the fan spindle connecting structure, the fan spindle connecting structure further includes:

and the axial pretension structure is configured to provide axial tension so that the locking outer ring and the main shaft are close to each other.

Optionally, in the fan spindle connecting structure, the axial pre-tightening tension structure is a locking bolt;

the locking bolt penetrates through the fourth hollow cylindrical section from the end face of the fourth hollow cylindrical section, which is opposite to the input shaft of the gear box, and is inserted into the end face of the main shaft, which is opposite to the fourth hollow cylindrical section.

Optionally, in the fan spindle connecting structure, the fan spindle connecting structure further includes:

an inner ring bushing configured to have an interference fit with an inner diameter of the first hollow cylindrical section;

wherein the center of the inner ring bushing is also provided with a lightening hole.

At present, two modes are adopted for the connection transmission of a wind power main shaft 1, a transmission shaft and a wind power gear box 2 of a wind generating set, fig. 1 is a schematic sectional structure diagram of the assembly of the main shaft, a planet carrier and a locking disc in the prior art, the connection of the wind power main shaft shown in fig. 1 is that the locking disc adopts an inner ring 3 and an outer ring 4 to sleeve, the wind power main shaft is locked in a key-free connection mode, and is fixed by a locking bolt 5. The connection of the main shaft and the planet carrier needs to generate axial force through a locking disc bolt so as to strain the inner ring and the outer ring of the locking disc to form conical surface positive pressure to act on the inner ring of the locking disc and the planet carrier, and the planet carrier shaft sleeve deforms after receiving the positive pressure from the locking disc and releases the force to the main shaft so as to realize the purpose of tightly holding the main shaft to transmit torque.

Specifically, the inner hole of the outer ring 4 is provided with steps and an inner conical surface, and threaded holes are uniformly distributed on the steps; the outer circle of the inner ring 3 is provided with a flange and an outer circular conical surface, and the flange is provided with screw through holes which correspond to the threaded holes on the outer ring ladder and are equal in number; the flange and the outer circular conical surface of the inner ring are assembled with the step and the inner circular conical surface of the outer ring in a matching way; the fitting surface of the inner ring 3 and the outer ring 4 is a conical surface, under the action of the pretightening force of the locking bolt 5, contact pressure is generated between the conical surfaces of the inner ring 3 and the outer ring 4, and the pressure can be transmitted between the planet carrier 2 and the main shaft 1, so that the purpose of transmitting the torque of the main shaft 1 to the planet carrier 2 is realized.

In the assembling structure for assembling the main shaft 1, the planet carrier 2 and the locking disc, because the inner ring 3 of the locking disc is in clearance fit with the planet carrier 2 and the inner ring 3 of the locking disc has certain rigidity, the pressure finally transmitted between the main shaft 1 and the planet carrier 2 is reduced, and the capacity of transmitting torque between the main shaft 1 and the planet carrier 2 is reduced. Accordingly, the prior art is yet to be improved and developed.

In addition, when the wind generating set is installed, the locking disc is sleeved on the shaft sleeve, the main shaft is inserted into an inner hole of the shaft sleeve, and the locking disc is locked by the fastening bolt; the processed blank is huge, the material is wasted, the installation is complex, the mutual matching difficulty of the hoisting and the connection operation is large due to the heavy hoisting weight, and the installation precision is difficult to control;

another structure is that a locking disk is not used, as shown in fig. 2 (a) to (b): the large flanges are respectively connected with the output shafts of the fan main shaft 1 and the fan gear box 2 through flange connection, the two flanges are connected through the bolts 3, and the structural form of transmission is that the weight of the fan main shaft and the large flanges is large, so that the difficulty of balanced hoisting and butt joint operation is increased.

According to the connection scheme, after positive pressure is formed between the inner ring and the outer ring of the locking disc, the locking disc is connected to the spindle through the planet carrier. Producing a second decay in alignment pressure. In order to realize larger torque transmission capacity, the specification of the locking disc, the specification of the bolts and the quantity arrangement all need to meet certain design requirements: the current design scheme needs enough bolts and increases the specification of the locking disc to ensure positive pressure;

with the increase of the requirement of the transmission torque, after the number of the bolts which can be arranged on a certain reference circle diameter reaches the upper limit, and the diameter width of the locking disc reaches the upper limit, the capacity of further improving the transmission torque capacity is limited.

As gearbox torque density increases, the reliability of the torque transmission capability becomes less and less reliable and cannot be addressed at lower cost by conventional approaches. The reasons include: 1) In a fixed space, the locking disc cannot meet the torque transmission capacity; 2) The increase space of the number of bolts is limited under the fixed reference circle diameter; 3) Increasing the low speed space increases more cost.

Based on the above insights, the utility model provides a fan main shaft connection structure, through omitting locking dish inner ring, only one locking outer loop realizes through the conical surface interference that the main shaft holds gear box input shaft (planet carrier) tightly and connects, realizes the biography between main shaft and gear box input shaft and turns round. The main shaft and the locking outer ring are flattened through the locking bolt, and positive pressure is generated under the matching action of the conical surfaces. Through the deformation of the main shaft under stress, positive pressure is transmitted to the input end of the gear box, and the slipping between the main shaft and the input shaft of the gear box is inhibited. The traditional design is that the input shaft of the gear box is a shaft sleeve, and the low-speed main shaft is a shaft. In contrast, the low-speed spindle is used as the shaft sleeve to tightly hold the input end of the gear box. The invention has the following advantages:

and one locking disc inner ring component is reduced, and the cost is reduced by changing the main shaft into the locking disc inner ring component.

The design scheme has the advantages of good effect, small design change, simple process and low cost.

The radial deformation can generate a self-pretightening effect, and the axial displacement is further protected.

Drawings

FIG. 1 is a schematic connection diagram of a locking plate of a conventional wind turbine main shaft connecting structure;

FIG. 2 (a) is a schematic view of a flange connection in a conventional wind turbine main shaft connection structure;

FIG. 2 (b) is a schematic view of an outer flange connection of a conventional wind turbine main shaft connection structure;

fig. 3 is a schematic view of a connection structure of a main shaft of a blower according to an embodiment of the present invention;

fig. 4 is a schematic main shaft view of a fan main shaft connection structure according to an embodiment of the present invention;

fig. 5 is a schematic view of an input shaft of a gear box of a fan main shaft connecting structure according to an embodiment of the present invention;

fig. 6 is a schematic view of a locking outer ring of a fan main shaft connection structure according to an embodiment of the present invention;

fig. 7 is a schematic view of an inner ring bushing of a fan main shaft connection structure according to an embodiment of the present invention;

shown in the figure: 11-a main shaft; 12-gearbox input shaft; 13-locking bolts; 141-inner ring connection mating face/first connection mating face; 142-outer race connection mating face/second connection mating face; 15-inner ring liner; 16-locking the outer ring.

Detailed Description

The main shaft connecting structure of the blower according to the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

Furthermore, features in different embodiments of the invention may be combined with each other, unless otherwise stated. For example, a feature of the second embodiment may be substituted for a corresponding or functionally equivalent or similar feature of the first embodiment, and the resulting embodiments are likewise within the scope of the disclosure or recitation of the present application.

An object of the utility model is to provide a fan main shaft connecting structure to solve the problem that can not satisfy the load demand of being connected of current wind-powered electricity generation gear box planet carrier and main shaft.

In order to achieve the above object, the utility model provides a fan main shaft connection structure, include: a main shaft configured to coaxially surround at least a partial column section of the gearbox input shaft; and a lock outer ring configured to coaxially surround at least part of the column sections of the main shaft and the gearbox input shaft, wherein contact surfaces of at least part of the column sections of any two of the main shaft, the gearbox input shaft and the lock outer ring are in interference fit.

Fig. 3 provides a first embodiment of the present invention, which shows a cross-sectional view of a main shaft connection structure of a wind turbine. The fan main shaft connecting structure comprises: a main shaft 11 configured to coaxially surround a partial cylindrical section of a gearbox input shaft 12; and a lock outer ring 16 configured to coaxially surround a partial cylindrical section of the main shaft and gearbox input shaft 12; wherein part of the cylindrical section contact surfaces of any two of the main shaft 11, the gearbox input shaft 12 and the lock outer ring 16 are in interference fit. The gear box input shaft 12 and the locking outer ring 16 can surround to form a groove structure, the inner ring part is provided by the gear box input shaft, the bottom surface and the outer ring part are provided by the locking outer ring, the groove can just accommodate the main shaft 11, the main cylindrical section of the main shaft 11 is a circular cylindrical section 111, and the circular cylindrical section enters the groove and is in interference fit with the groove; and an axial pretension structure 13 configured to provide an axial tension between the groove structure and the spindle.

In the embodiment, the connection structure is pre-tightened by the locking bolt to enable the locking outer ring 16 to axially move with the conical interference surface of the main shaft 11, and radial pressure is generated between the conical interference surface and the torque transmission surface. The torque is transmitted by the radial pressure and the anti-slip capability between the matching surfaces of the input shaft (planet carrier) of the gear box and the circular cylindrical section of the main shaft. The transmission chain structure is suitable for installation and maintenance of the input shaft of the gearbox.

Awl interference fit face outer loop (locking outer loop 16) is installed outside the main shaft independently, awl interference fit face inner loop (main shaft 11+ gear box input shaft 12) is located the low-speed main shaft side, locking bolt is from gear box side pretension, required axial pretension pulling force is lower, the bolt is small in quantity, the diameter is subject to main shaft bearing internal diameter in the fitting surface, it is great to compare prior art promotion, the transmission torque capacity is bigger, the radial pressure that the conical surface cooperation produced transmits main shaft and planet carrier fitting surface, torque transmission face and awl interference fit face are independent of each other. The connecting scheme is not only suitable for the connection scheme of the pneumatic low-speed spindle and the gear box, and the low-speed spindle and the gear box are directly in interference connection and mutually supported when the number of bolts is enough, so that torque transmission is realized.

Specifically, in the fan main shaft connecting structure, the side wall of the groove includes an inner ring connecting matching surface 141 (a contact surface between the main shaft 11 and the gearbox input shaft 12) and an outer ring connecting matching surface 142 (a contact surface between the main shaft 11 and the locking outer ring 16); the inner side wall of the circular ring column section of the main shaft 11 is provided with a first connecting matching surface 141; the outer side wall of the circular ring cylinder section is provided with a second connecting matching surface 142; the first connecting fitting surface 141 is in interference fit with the inner ring connecting fitting surface 141; the second connecting fitting surface 142 is in interference fit with the outer ring connecting fitting surface 142.

Further, as shown in fig. 5, the gearbox input shaft 12 includes: a first hollow cylindrical section 121 configured such that an outer side surface is in contact with an inner side surface of the main shaft; a second hollow cylindrical section 122 configured such that the outer side surface is in contact with the inner side surface of the locking outer ring; and a third hollow cylindrical section 123 configured to be located at an end remote from the main shaft. The inner diameters of the first hollow cylindrical section, the second hollow cylindrical section and the third hollow cylindrical section are the same; the outer diameters of the first hollow cylindrical section and the second hollow cylindrical section are the same; the outer diameter of the first hollow cylindrical section is smaller than the outer diameter of the third hollow cylindrical section. As shown in fig. 4, the spindle 11 includes: a circular cylindrical section 111 configured to connect with the lock outer ring and a partial cylindrical section of the gearbox input shaft; and an irregular cylindrical section 112 configured to be positioned at one end far away from the input shaft of the gear box, and the inner side and the outer side are spliced by conical surfaces, wedge-shaped cylindrical surfaces and/or arc surfaces.

Further, in the fan main shaft connecting structure, the outer side surface of the first hollow cylindrical section forms an inner ring connecting matching surface 141; and as shown in fig. 6, the inner side surface of the fifth hollow cylindrical section 162 of the lock outer ring 16 constitutes the outer ring connecting fitting surface 142; the input shaft 12 of the gear box is arranged on the inner periphery, the locking outer ring 16 is arranged on the outer periphery, and the two radially surround to form a groove structure.

The outer side surface of the circular cylindrical section is a conical surface, the outer diameter of the circular cylindrical section is gradually increased from the input shaft of the gear box to the irregular cylindrical section, and the inner diameter of the circular cylindrical section is kept unchanged; the outer axial tangent of the circular cylindrical section and the inner axial tangent of the circular cylindrical section form an included angle of 0-20 degrees, wherein the optimal angle is 2-10 degrees. The locking outer ring includes: a fourth hollow cylindrical section 161 configured to surround the second hollow cylindrical section 122; and a fifth hollow cylindrical section 162 configured to surround the annular cylindrical section 111; wherein the annular cylindrical section surrounds the first hollow cylindrical section; the outer diameter of the fourth hollow cylindrical section is the same as that of the fifth hollow cylindrical section; the inner diameter of the fourth hollow cylindrical section is greater than the inner diameter of the fifth hollow cylindrical section. The inner side surface of the fifth hollow cylindrical section is a conical surface, the inner diameter of the fifth hollow cylindrical section is gradually increased from the input shaft of the gear box to the irregular cylindrical section, and the outer diameter of the fifth hollow cylindrical section is kept unchanged; the outer axial tangent of the fifth hollow cylindrical section and the inner axial tangent of the fifth hollow cylindrical section form an included angle of 0-20 degrees, wherein the optimal angle is 2-10 degrees.

In order to form the surface contact or even interference fit between the first connecting matching surface 141 and the inner ring connecting matching surface 141, in the fan spindle connecting structure, the outer side surface of the first hollow cylindrical section is a straight surface or a conical surface, and the straight surface is shown in fig. 3; if the conical surface is formed, the outer diameter of the first hollow cylindrical section is gradually increased from the end surface to the second hollow cylindrical section, and the inner diameter of the first hollow cylindrical section is kept unchanged; the outer axial tangent of the first hollow cylindrical section and the inner axial tangent of the first hollow cylindrical section form an included angle of 0-20 degrees, wherein the optimal angle is 2-10 degrees.

In order to form interference fit between the second connecting matching surface 142 and the outer ring connecting matching surface 142, in the fan spindle connecting structure, the inner side surface of the locking outer ring is a conical surface, the inner diameter of the locking outer ring is gradually increased from the bottom surface with the groove to the irregular column section, and the outer diameter of the locking outer ring is kept unchanged; the outer axial tangent of the locking outer ring and the inner axial tangent of the locking outer ring form an included angle of 0-20 degrees. The two sides of the main shaft can be both torque transmission, so that the two sides are both provided with conical surfaces which have certain angles with the axis. For example, an included angle of 0-20 degrees is formed between the inner axial tangent and the outer axial tangent of the circular cylindrical section or between the inner axial tangent and the outer axial tangent of the circular cylindrical section and the inner axial tangent of the first hollow cylindrical section, wherein the optimal angle is 2-10 degrees.

In order to make two interference fit faces realize the interference, need to have axial tension between main shaft and the groove structure for both are close to as far as possible, in fan main shaft connection structure, still include: and the axial pretension structure is configured to provide axial tension so that the locking outer ring and the main shaft are close to each other. The axial pre-tightening tension structure is a locking bolt 13; the locking bolt 13 is inserted into the fourth hollow cylindrical section from the end face of the fourth hollow cylindrical section, which is opposite to the input shaft of the gear box, and is inserted into the end face of the main shaft, which is opposite to the fourth hollow cylindrical section.

Firstly, the locking outer ring 16 is placed on the low-speed spindle 11, the input end 12 of the gear box is inserted into an inner hole of the low-speed spindle, and a gap between the locking outer ring 16 and the low-speed spindle 11 is flattened by tightening the locking bolt 13, so that the purpose of interference torque transmission is achieved. If the support capacity is insufficient due to large deformation of the input shaft of the gearbox, an inner ring bushing 15 can be added to increase the rigidity of the inner ring of the input shaft of the gearbox. In the connection structure of the main shaft of the wind turbine, as shown in fig. 7, the connection structure further includes: an inner ring bushing 15 configured to have an interference fit with an inner diameter of the first hollow cylindrical section; wherein the center of the inner ring bush 15 also has a lightening hole.

To sum up the utility model provides a fan main shaft connection structure, through omitting locking dish inner ring, only one locking outer loop realizes through the conical surface interference that the main shaft holds gear box input shaft (planet carrier) tightly and connects, realizes passing the turn-round between main shaft and gear box input shaft. The main shaft and the locking outer ring are flattened through the locking bolt, and positive pressure is generated under the matching action of the conical surfaces. Through the deformation of the main shaft under stress, positive pressure is transmitted to the input end of the gear box, and the slipping between the main shaft and the input shaft of the gear box is inhibited. The traditional design is that the input shaft of the gear box is a shaft sleeve, and the low-speed main shaft is a shaft. In contrast, the low-speed spindle is used as the shaft sleeve to tightly hold the input end of the gear box. The invention has the following advantages: one locking disc inner ring component is reduced, and the cost is reduced by changing the main shaft into the locking disc inner ring component; the design scheme has the advantages of good effect, small design change, simple process and low cost; radial deformation can generate a self-pretightening effect, and further protects axial movement.

In summary, the above embodiments have described the different configurations of the main shaft connecting structure of the wind turbine in detail, and of course, the present invention includes but is not limited to the configurations listed in the above embodiments, and any configuration that is changed based on the configurations provided by the above embodiments is within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the description of the method part.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims (10)

1. The utility model provides a fan main shaft connection structure which characterized in that includes:

a main shaft configured to coaxially surround at least a partial column section of the gearbox input shaft; and

a lock outer ring configured to coaxially surround at least part of the column sections of the main shaft and the gearbox input shaft, wherein contact surfaces of at least part of the column sections of any two of the main shaft, the gearbox input shaft, and the lock outer ring are in interference fit.

2. The fan main shaft connection structure according to claim 1, wherein the gear box input shaft includes:

a first hollow cylindrical section configured such that an outer side surface thereof is in contact with an inner side surface of the main shaft;

a second hollow cylindrical section configured such that an outer side surface contacts an inner side surface of the locking outer ring; and

and the third hollow cylindrical section is configured to be positioned at one end far away from the main shaft.

3. Fan main shaft connecting structure according to claim 2,

the inner diameters of the first hollow cylindrical section, the second hollow cylindrical section and the third hollow cylindrical section are the same;

the outer diameters of the first hollow cylindrical section and the second hollow cylindrical section are the same;

the outer diameter of the first hollow cylindrical section is smaller than the outer diameter of the third hollow cylindrical section.

4. The wind turbine main shaft connecting structure according to claim 3, wherein the main shaft includes:

a ring cylindrical section configured to connect with the lock outer ring and a partial cylindrical section of the gearbox input shaft; and

the irregular cylindrical section is configured to be located at one end far away from the input shaft of the gear box, and the inner side surface and the outer side surface are formed by splicing a conical surface, a wedge-shaped cylindrical surface and/or an arc surface.

5. The connecting structure of a main shaft of a fan as claimed in claim 4, wherein the outer side surface of the circular cylindrical section is a conical surface, the outer diameter of the circular cylindrical section is gradually increased from the input shaft of the gear box to the irregular cylindrical section, and the inner diameter of the circular cylindrical section is kept unchanged;

the outer axial tangent of the circular cylindrical section and the inner axial tangent of the circular cylindrical section form an included angle of 0-20 degrees.

6. The fan main shaft connecting structure according to claim 5, wherein the lock outer ring includes:

a fourth hollow cylindrical section configured to surround the second hollow cylindrical section; and

a fifth hollow cylindrical section configured to surround the cylindrical section;

wherein the cylindrical section surrounds the first hollow cylindrical section; the outer diameter of the fourth hollow cylindrical section is the same as that of the fifth hollow cylindrical section; the inner diameter of the fourth hollow cylindrical section is greater than the inner diameter of the fifth hollow cylindrical section.

7. The fan main shaft connecting structure according to claim 6, wherein the inner side surface of the fifth hollow cylindrical section is a conical surface, the inner diameter of the fifth hollow cylindrical section is gradually increased from the input shaft of the gear box to the irregular cylindrical section, and the outer diameter of the fifth hollow cylindrical section is kept unchanged;

an included angle of 0-20 degrees is formed between the outer axial tangent of the fifth hollow cylindrical section and the inner axial tangent of the fifth hollow cylindrical section.

8. The wind turbine main shaft connecting structure according to claim 7, further comprising:

and the axial pretension structure is configured to provide axial tension so that the locking outer ring and the main shaft are close to each other.

9. The wind turbine main shaft connecting structure according to claim 8, wherein the axial pretensioning structure is a locking bolt;

the locking bolt penetrates through the fourth hollow cylindrical section from the end face of the fourth hollow cylindrical section, which is opposite to the input shaft of the gear box, and is inserted into the end face of the main shaft, which is opposite to the fourth hollow cylindrical section.

10. The blower main shaft connection structure according to claim 2, further comprising:

an inner ring bushing configured to have an interference fit with an inner diameter of the first hollow cylindrical section;

wherein the center of the inner ring bushing is also provided with a lightening hole.

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