CN218235876U - Main shaft connecting structure of fan - Google Patents
Main shaft connecting structure of fan Download PDFInfo
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- CN218235876U CN218235876U CN202221750468.9U CN202221750468U CN218235876U CN 218235876 U CN218235876 U CN 218235876U CN 202221750468 U CN202221750468 U CN 202221750468U CN 218235876 U CN218235876 U CN 218235876U
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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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Abstract
The utility model provides a fan main shaft connection structure, include: the gearbox input shaft comprises a first hollow cylindrical section, wherein a concentric annular groove is formed in the end face of the first hollow cylindrical section; a spindle configured as an annular cylinder, wherein the annular cylinder enters the groove and is in interference fit therewith; and an axial pretension structure configured to provide an axial tension between the gearbox input shaft and the main shaft.
Description
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 sometimes 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 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 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 matching 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 achieved.
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 connecting operations is large due to the large 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 main shaft is connected 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 requires 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:
the gearbox input shaft comprises a first hollow cylindrical section, wherein a first end face of the first hollow cylindrical section is provided with a concentric annular groove;
a spindle configured as an annular cylinder, wherein the annular cylinder enters the groove and is in interference fit therewith; and
an axial pretension structure configured to provide an axial tension between the gearbox input shaft and the main shaft.
Optionally, in the fan main shaft connecting structure,
the side wall of the groove comprises an inner ring connection matching surface and an outer ring connection matching surface;
the inner side wall of the circular cylinder body is provided with a first connecting matching surface;
the outer side wall of the circular cylinder body is provided with a second connecting matching surface;
the first connecting matching surface is in interference fit with the inner ring connecting matching surface;
the second connecting matching surface is in interference fit with the outer ring connecting matching surface.
Optionally, in the fan main shaft connecting structure, the gearbox input shaft further includes a second hollow cylindrical section, wherein:
the inner 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 greater than the outer diameter of the second hollow cylindrical section to form a first stepped platform on the outer side of the gearbox input shaft.
Optionally, in the fan main shaft connection structure, the first stepped platform is a second end surface of the first hollow cylindrical section, the first end surface of the first hollow cylindrical section is opposite to the main shaft, and the second end surface of the first hollow cylindrical section is connected with the second hollow cylindrical section;
the groove is located on the first end face, the axial pre-tightening tension structure penetrates into the input shaft of the gearbox from the second end face, enters the groove from the bottom face of the groove and is inserted into the main shaft.
Optionally, in the fan main shaft connecting structure,
the axial pre-tightening tension structure is a locking bolt for providing axial tension, so that the main shaft penetrating into the groove as far as possible keeps the position.
Optionally, in the fan spindle connection structure, the outer side wall of the groove is an outer ring connection matching surface, the outer ring connection matching surface is a conical surface, the inner diameter of the outer ring connection matching surface gradually increases from the bottom surface of the groove to the first end surface, and the outer diameter of the first hollow cylindrical section remains unchanged;
the outer axial tangent of the first hollow cylindrical section and the inner axial tangent of the outer ring connecting matching surface form an included angle of 0-20 degrees.
Optionally, in the fan spindle connection structure, the inner side wall of the groove is an inner ring connection matching surface, the inner ring connection matching surface is a straight surface, the inner diameter of the inner ring connection matching surface remains unchanged, and the inner diameter of the first hollow cylindrical section remains unchanged;
an included angle of 0 degree is formed between the inner axial tangent of the first hollow cylindrical section and the inner axial tangent of the inner ring connecting and matching surface.
Optionally, in the fan spindle connection structure, the first connection fitting surface is a straight surface, the second connection fitting surface is a conical surface, the inner diameter of the first connection fitting surface remains unchanged, and the outer diameter of the second connection fitting surface gradually increases from the top surface of the circular cylinder to the root of the circular cylinder;
the outer axial tangent of the second connecting matching surface and the inner axial tangent of the first connecting matching surface form an included angle of 0-20 degrees.
Optionally, in the fan main shaft connecting structure, the fan main shaft 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 also has a lightening hole.
Optionally, in the fan main shaft connecting structure, the gear box input shaft further includes:
a third hollow cylindrical section configured to have an outer diameter greater than an outer diameter of the second hollow cylindrical section to form a second stepped land on an outer side of the gearbox input shaft.
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 matching 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 achieved.
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 connecting operations is large due to the large 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 flange combined type butt joint device for the inner ring of the wind power main shaft locking disc is provided by utilizing flange connection, namely the output shafts of the fan main shaft 1 and the fan gear box 2 are respectively connected with one large flange, and the two flanges are connected through the bolts 3 to form a transmission structure, so that the difficulty of balanced hoisting and butt joint operation is increased due to the large weight of the fan main shaft and the large flange.
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 requires 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 the cost more.
Based on above insights, the utility model provides a fan main shaft connection structure, through slot structure gear box input shaft as locking outer loop + inner ring, the main shaft is as embedding locking outer loop and the part between the inner ring, and the gear box input shaft surrounds the main shaft two sides, changes traditional low-speed locking dish connection scheme into main shaft and the direct conical surface cooperation of gear box input shaft (planet carrier), and ingenious utilization main shaft and gear box are each other for supporting separately, contact conical surface between them and realize the biography and turn round. The main shaft and the planet carrier conical surface are leveled through the bolts, and positive pressure is generated under the matching action of the conical surfaces to inhibit the slipping between the main shaft and the gear box. The invention has the following advantages:
one locking disc part is reduced, torque transmission is realized through respective cone interference of the main shaft and the gear box, and cost is reduced.
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.
Drawings
FIG. 1 is a schematic view of a locking disk connection of a conventional wind turbine main shaft connection 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 external 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 connection structure according to an embodiment of the present invention;
fig. 6 is a schematic view illustrating a fan main shaft connection structure with double cones interference 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.
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 specified. 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: the gearbox input shaft comprises a first hollow cylindrical section, and a concentric annular groove is formed in the end face of the first hollow cylindrical section; the main shaft is configured as a circular cylinder, and the circular cylinder enters the groove and is in interference fit with the groove; and an axial pretension structure configured to provide an axial tension between the gearbox input shaft and the main shaft.
Fig. 3 provides a first embodiment of the present invention, which shows a cross-sectional view of the main shaft connection structure of the wind turbine. The fan main shaft connecting structure comprises: a gearbox input shaft 12 comprising a first hollow cylindrical section 121, said first hollow cylindrical section 121 having concentric annular grooves on a first end face 122 thereof; a main shaft 11 configured as a circular cylinder, and the circular cylinder 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 gearbox input shaft 12 and the main shaft 11. The invention adopts the matching mode that the conical surface is arranged in the groove of the main shaft, changes the traditional low-speed locking disc connection into the direct conical surface matching of the main shaft and the planet carrier, reduces one locking disc part, realizes torque transmission through the respective conical interference of the main shaft and the gear box, and reduces the cost.
The connecting structure enables the conical surface between the main shaft and the planet carrier to be matched through the tension bolt to generate axial displacement and radial interference, so that huge radial pressure and frictional resistance are generated on the interference surface to transmit torque. The locking bolt is positioned in an inner hole of the input shaft of the gear box, and is suitable for the connection scheme of the pneumatic low-speed spindle and the gear box. The outer ring of the cone interference fit surface is positioned on the side of the gear box; the cone interference fit surface inner ring is positioned on the main shaft side. An inner hole at the input end of the gear box is supported by the low-speed shaft main shaft; the locking bolt is pre-tightened from the side of the gear box; the required axial pre-tightening tension is low, and the number of bolts is small; the center diameter of the fitting surface is limited by the inner diameter of the main shaft bearing.
Specifically, in the fan spindle connecting structure, the side wall of the groove includes an inner ring connecting matching surface 141 and an outer ring connecting matching surface 142; the inner side wall of the circular cylinder body is provided with a first connecting matching surface 141; the outer side wall of the circular cylinder 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 mating surface 142 is in interference fit with the outer ring connecting mating surface 142.
Further, in the fan main shaft connection structure, as shown in fig. 5, the gearbox input shaft 12 further includes a second hollow cylindrical section 123, wherein: the first hollow cylindrical section 121 and the second hollow cylindrical section 123 have the same inner diameter; the first hollow cylindrical section has an outer diameter greater than the outer diameter of the second hollow cylindrical section to form a first stepped land 124 on the outer side of the gearbox input shaft 12. The first stepped platform is a second end surface 124 of the first hollow cylindrical section, the first end surface of the first hollow cylindrical section is opposite to the main shaft, and the second end surface of the first hollow cylindrical section is connected with the second hollow cylindrical section; the grooves are located on the first end face and the axial pretension structure penetrates into the gearbox input shaft 12 from the second end face and into the grooves from the bottom face of the grooves and is inserted into the end face 111 of the main shaft as shown in fig. 4. The axial pretension 13 is a locking bolt that provides an axial tension so that the spindle 11, which is as deep as possible into the groove, maintains this position.
In order to form a first interference fit surface, in the fan spindle connection structure, the outer side wall of the groove is an outer ring connection fit surface 142, the outer ring connection fit surface 142 is a conical surface, the inner diameter of the outer ring connection fit surface 142 gradually increases from the bottom surface of the groove to the first end surface 122, and the outer diameter of the first hollow cylindrical section 121 is kept unchanged; the outer axial tangent of the first hollow cylindrical section 121 and the inner axial tangent of the outer ring connecting fitting surface form an included angle of 0-20 degrees, wherein the optimal angle is 2-10 degrees.
The second interference fit surface may be formed, or may be used only as a common contact surface, if the interference fit surface is formed, the inner ring connection fit surface may also be set as a conical surface as shown in fig. 6, and similarly, the first connection fit surface may also be correspondingly set as a conical surface. If the inner ring is used as a common contact surface, as shown in the fan spindle connecting structure illustrated in fig. 3, the inner side wall of the groove is an inner ring connecting matching surface 141, the inner ring connecting matching surface 141 is a straight surface, the inner diameter of the inner ring connecting matching surface remains unchanged, and the inner diameter of the first hollow cylindrical section 121 remains unchanged; the inner axial tangent of the first hollow cylindrical section 121 and the inner axial tangent of the inner ring connecting and matching surface form an included angle of 0 degree. As shown in fig. 6, the inner ring connecting fitting surface 141 and the outer ring connecting fitting surface 142 may have double-cone interference, or as shown in fig. 3, one of them may have 0-degree interference, and the other may have cone interference.
In order to match the internal structure of the groove, the input shaft of the gear box is provided with a corresponding matching surface, in the fan main shaft connecting structure, the first connecting matching surface 141 is a straight surface, the second connecting matching surface 142 is a conical surface, the inner diameter of the first connecting matching surface 141 is kept unchanged, and the outer diameter of the second connecting matching surface 142 is gradually increased from the top surface of the circular cylinder to the root of the circular cylinder; the outer axial tangent of the second connecting fitting surface 142 and the inner axial tangent of the first connecting fitting surface have an included angle of 0 to 20 degrees, wherein the optimal angle is 2 to 10 degrees.
The low-speed spindle 11 or the gear box 12 is fixed, the gear box 12 or the low-speed spindle 11 is gradually moved along the cone interference fit surface 14 through the pre-tightening of the tension bolt 13, and the purpose of interference torque transmission is achieved when no axial clearance exists between the low-speed spindle 11 and the gear box planet carrier 12. If the support capacity is insufficient due to large deformation of the gearbox input shaft 12, an inner ring bushing 15 can be added to increase the rigidity of the inner ring, and the inner ring bushing 15 and the gearbox input shaft 12 can be integrated. In the fan main shaft connecting structure, the fan main shaft connecting structure further comprises: an inner ring bushing 15 configured to have an interference fit with the inner diameter of the first hollow cylindrical section; wherein the center of the inner ring bush 15 also has a lightening hole. In the fan main shaft connecting structure, the gear box input shaft further includes: a third hollow cylindrical section 125 configured with an outer diameter larger than the outer diameter of the second hollow cylindrical section to form a second stepped platform on the outer side of the gearbox input shaft.
The utility model provides a fan main shaft connection structure, through slot structure gear box input shaft as locking outer loop + inner ring, the main shaft is as embedding locking outer loop and the part between the inner ring, and the gear box input shaft surrounds the main shaft two sides, changes traditional low-speed locking dish connection scheme into main shaft and the direct conical surface cooperation of gear box input shaft (planet carrier), and ingenious utilization main shaft and gear box are each other for supporting each other separately, contact the conical surface between them and realize the biography and turn round. The conical surfaces of the main shaft and the planet carrier are flattened through the bolts, and positive pressure is generated under the matching action of the conical surfaces to inhibit the slippage between the main shaft and the gear box. The invention has the following advantages: one locking disc part is reduced, torque transmission is realized through respective cone interference of the main shaft and the gear box, and the cost is reduced; 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 method part for description.
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:
the gearbox input shaft comprises a first hollow cylindrical section, wherein a first end face of the first hollow cylindrical section is provided with a concentric annular groove;
a spindle configured as an annular cylinder, wherein the annular cylinder enters the groove and is in interference fit therewith; and
an axial pretension structure configured to provide an axial tension between the gearbox input shaft and the main shaft.
2. The blower main shaft connection structure according to claim 1,
the side wall of the groove comprises an inner ring connection matching surface and an outer ring connection matching surface;
the inner side wall of the circular cylinder body is provided with a first connecting matching surface;
the outer side wall of the circular cylinder body is provided with a second connecting matching surface;
the first connecting matching surface is in interference fit with the inner ring connecting matching surface;
the second connecting matching surface is in interference fit with the outer ring connecting matching surface.
3. The fan spindle connection of claim 2, wherein the gearbox input shaft further comprises a second hollow cylindrical section, wherein:
the inner 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 greater than the outer diameter of the second hollow cylindrical section to form a first stepped platform on the outer side of the gearbox input shaft.
4. The connecting structure of a main shaft of a wind turbine according to claim 3, wherein the first stepped platform is a second end surface of the first hollow cylindrical section, the first end surface of the first hollow cylindrical section is opposite to the main shaft, and the second end surface of the first hollow cylindrical section is connected with the second hollow cylindrical section;
the groove is located on the first end face, the axial pre-tightening tension structure penetrates into the input shaft of the gearbox from the second end face, enters the groove from the bottom face of the groove and is inserted into the main shaft.
5. The wind turbine main shaft connecting structure according to claim 4,
the axial pre-tightening tension structure is a locking bolt for providing axial tension, so that the main shaft penetrating into the groove as far as possible keeps the position.
6. The main shaft connecting structure of a blower according to claim 4, wherein an outer side wall of the groove is an outer ring connecting fitting surface, the outer ring connecting fitting surface is a tapered surface, an inner diameter of the outer ring connecting fitting surface gradually increases from a bottom surface of the groove to the first end surface, and an outer diameter of the first hollow cylindrical section remains unchanged;
the outer axial tangent of the first hollow cylindrical section and the inner axial tangent of the outer ring connecting matching surface form an included angle of 0-20 degrees.
7. The fan main shaft connecting structure according to claim 6, wherein the inner side wall of the groove is an inner ring connecting and matching surface which is a straight surface, the inner diameter of the inner ring connecting and matching surface is kept constant, and the inner diameter of the first hollow cylindrical section is kept constant;
an included angle of 0 degree is formed between the inner axial tangent of the first hollow cylindrical section and the inner axial tangent of the inner ring connecting and matching surface.
8. The main shaft connecting structure of a blower fan according to claim 7, wherein the first connecting fitting surface is a straight surface, the second connecting fitting surface is a tapered surface, an inner diameter of the first connecting fitting surface is kept constant, and an outer diameter of the second connecting fitting surface is gradually increased from the top surface of the annular cylinder to the root of the annular cylinder;
the outer axial tangent of the second connecting matching surface and the inner axial tangent of the first connecting matching surface form an included angle of 0-20 degrees.
9. The fan main shaft connecting structure according to claim 3, 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 also has a lightening hole.
10. The wind turbine main shaft connection structure of claim 3, wherein the gearbox input shaft further comprises:
a third hollow cylindrical section configured to have an outer diameter greater than an outer diameter of the second hollow cylindrical section to form a second stepped land on an outer side of the gearbox input shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221750468.9U CN218235876U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221750468.9U CN218235876U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218235876U true CN218235876U (en) | 2023-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221750468.9U Active CN218235876U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218235876U (en) |
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2022
- 2022-07-08 CN CN202221750468.9U patent/CN218235876U/en active Active
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