CN218235874U - Main shaft connecting structure of fan - Google Patents
Main shaft connecting structure of fan Download PDFInfo
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- CN218235874U CN218235874U CN202221752119.0U CN202221752119U CN218235874U CN 218235874 U CN218235874 U CN 218235874U CN 202221752119 U CN202221752119 U CN 202221752119U CN 218235874 U CN218235874 U CN 218235874U
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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: a spindle configured to include a first force application surface and a first connection mating surface; a gearbox input shaft configured to include a second force application surface and a second connecting mating surface; the axial pre-tightening tension structure is configured to penetrate through the second force application surface after the first force application surface penetrates through the main shaft; wherein the first connecting matching surface and the second connecting matching surface are in interference fit.
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 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 conical surface of the inner ring are assembled with the step and the inner 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 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 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 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 main shaft comprises a first force application surface and a first connecting and matching surface;
the gear box input shaft comprises a second force application surface and a second connection matching surface, wherein the first connection matching surface and the second connection matching surface are in interference fit; and
and the axial pretension tension structure is configured to penetrate through the main shaft from the first force application surface and penetrate through the second force application surface.
Optionally, in the fan spindle connecting structure, the axial pre-tightening tension structure is a locking bolt, so that the first force application surface and the second force application surface are as close as possible.
Optionally, in the connecting structure of the main shaft of the wind turbine, the main shaft includes a first hollow cylindrical section and a second hollow cylindrical section which are concentric, and a platform section connecting the first hollow cylindrical section and the second hollow cylindrical section to form a wedge-shaped cross section.
Optionally, in the fan main shaft connecting structure,
the outer diameter of the first hollow cylindrical section is greater than the outer diameter of the second hollow cylindrical section so that the platform section forms an outer wedge-shaped platform, and the second force application surface is opposite to the outer wedge-shaped platform.
Optionally, in the fan main shaft connecting structure,
the inner diameter of the first hollow cylindrical section is larger than that of the second hollow cylindrical section, so that the platform section forms an inner wedge-shaped platform, and the first acting surface is positioned on the inner wedge-shaped platform.
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 second hollow cylindrical section;
wherein the center of the inner ring bushing also has a lightening hole.
Optionally, in the fan spindle connection structure, an outer side surface of the second hollow cylindrical section is a conical surface, an outer diameter of the second hollow cylindrical section gradually decreases from a root at the outer side wedge-shaped platform to a tail end, and an inner diameter of the second hollow cylindrical section remains unchanged.
Optionally, in the connection structure of the main shaft of the blower, the input shaft of the gear box includes a third hollow cylindrical section, the second force application surface is located at the top end of the third hollow cylindrical section, the top end of the third hollow cylindrical section is opposite to the outer wedge-shaped platform, and the inner side surface of the third hollow cylindrical section is a second connection matching surface.
Optionally, in the main shaft connecting structure of the wind turbine, an inner side surface of the third hollow cylindrical section is a conical surface, an inner diameter of the third hollow cylindrical section gradually decreases from the top end to the tail end, and an outer diameter of the third hollow cylindrical section remains unchanged.
Optionally, in the fan main shaft connecting structure,
the outer axial tangent of the second hollow cylindrical section and the inner axial tangent of the second hollow cylindrical section form an included angle of 0-20 degrees;
the outer axial tangent of the third hollow cylindrical section and the inner axial tangent of the third hollow cylindrical section form an included angle of 0-20 degrees.
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 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 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 more cost.
Based on above insight, the utility model provides a fan main shaft connection structure changes main shaft and the direct conical surface cooperation of planet carrier into through traditional low-speed locking dish connection scheme, and ingenious utilization main shaft and gear box are each other for supporting separately, and the biography is turned round in the conical surface realization between them of contact. The input shaft (planet carrier) of the gear box is a conical outer ring, and the main shaft is a conical inner ring. 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 utility model has the advantages that:
one locking disc component is reduced, torque transmission is realized through respective cone interference of the main shaft and the input shaft of 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.
The radial deformation can generate a self-pretightening effect, and the axial displacement is further protected.
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;
shown in the figure: 11-a main shaft; 12-gearbox input shaft; 13-locking bolts; 14-first 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 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 achieve the above object, the utility model provides a fan main shaft connection structure, include: a spindle configured to include a first force application surface and a first connection mating surface; a gearbox input shaft configured to include a second force application surface and a second connecting mating surface; the axial pre-tightening tension structure is configured to penetrate through the main shaft from the first acting surface and then enter the second acting surface; wherein the first connecting matching surface and the second connecting matching surface 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 include a first force application surface 16 and a first connection mating surface 14; a gearbox input shaft 12 configured to include a second force application surface 17 and a second connection mating surface 14; the axial pre-tensioning structure 13 is configured to enter the second force application surface 17 after the first force application surface 16 passes through the spindle 11; wherein the first connecting mating face 14 and the second connecting mating face 14 are interference fit.
The utility model discloses a cooperation mode of conical surface changes traditional low-speed locking dish connection scheme into the direct conical surface cooperation of main shaft and planet carrier, advantage: one locking disc component is reduced, torque transmission is realized through respective cone interference of the main shaft and the gear box, and cost is reduced. The outer ring of the cone interference fit surface is positioned on the planet carrier of the gear box; an inner ring of the cone interference fit surface is positioned on the low-speed spindle side; the tension bolt is pre-tightened from the impeller side; the required axial pre-tightening tension is low, and the number of bolts is small; the fit surface pitch diameter is limited by the spindle bore diameter and the spindle bearing inner diameter.
Specifically, in the fan spindle connection structure, the axial pretension tension structure is the locking bolt 13, so that the first force application surface 16 and the second force application surface 17 are as close as possible. The embodiment is suitable for the connection scheme of the pneumatic low-speed spindle and the gear box, the number of bolts is enough, the low-speed spindle and the gear box are in direct interference connection and mutually support, and torque transmission is achieved.
Further, in the fan main shaft connecting structure, as shown in fig. 4, the main shaft 11 includes a first hollow cylindrical section 18 and a second hollow cylindrical section 20 which are concentric, and a platform section 19 which connects the first hollow cylindrical section 18 and the second hollow cylindrical section 20 to form a wedge-shaped cross section. In the fan main shaft connecting structure, the outer diameter of the first hollow cylindrical section 18 is larger than that of the second hollow cylindrical section 20, so that the platform section 19 forms an outer wedge-shaped platform, and the second acting surface 17 is opposite to the outer wedge-shaped platform. The inner diameter of the first hollow cylindrical section 18 is larger than the inner diameter of the second hollow cylindrical section 20, so that the platform section 19 forms an inner wedge-shaped platform on which the first force application surface 16 is located.
In addition, the low-speed main shaft 11 is fixed, the gear box input shaft 12 is gradually moved leftwards along the cone interference matching surface (the first connecting matching surface 14) through the pre-tightening of the tension bolt 3, and the purpose of interference torque transmission is achieved when no axial clearance exists between the low-speed main shaft 11 and the gear box planet carrier (the gear box input shaft 12). If the main shaft deforms greatly and the supporting capacity is insufficient, an inner ring bushing 15 can be added to increase the rigidity of the inner ring. In the fan main shaft connecting structure, the fan main shaft connecting structure further comprises an inner ring bushing 15 which is configured to be in interference fit with the inner diameter of the second hollow cylindrical section; wherein the center of the inner ring bush 15 also has a lightening hole.
In order to form an inner ring of an interference conical surface, in the fan main shaft connecting structure, the outer side surface of the second hollow cylindrical section is a conical surface, the outer diameter of the second hollow cylindrical section is gradually reduced from the root of the wedge-shaped platform at the outer side to the tail end, and the inner diameter of the second hollow cylindrical section is kept unchanged. The outer axial tangent of the second hollow cylindrical section and the inner axial tangent of the second hollow cylindrical section form an included angle of 0-20 degrees; wherein the optimal angle is 2-10 degrees.
In order to form an outer ring of the interference conical surface, in the fan main shaft connection structure, as shown in fig. 5, the gear box input shaft 12 includes a third hollow cylindrical section 21, the second force application surface 17 is located at the top end of the third hollow cylindrical section 21, the top end of the third hollow cylindrical section 21 faces the outer side wedge platform, and the inner side surface of the third hollow cylindrical section is a second connection matching surface. The inner side surface of the third hollow cylindrical section is a conical surface, the inner diameter of the third hollow cylindrical section is gradually reduced from the top end to the tail end, and the outer diameter of the third hollow cylindrical section is kept unchanged. The outer axial tangent of the third hollow cylindrical section and the inner axial tangent of the third hollow cylindrical section form an included angle of 0-20 degrees, wherein the optimal angle is 2-10 degrees.
The utility model provides a pair of fan main shaft connection structure changes main shaft and the direct conical surface cooperation of planet carrier into through traditional low-speed locking dish connection scheme, and ingenious utilization main shaft and gear box are each other for supporting separately, and the biography is turned round in the conical surface realization between them of contact. The input shaft (planet carrier) of the gear box is a conical outer ring, and the main shaft is a conical inner ring. 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 utility model has the advantages of the following: one locking disc part is reduced, torque transmission is realized through respective cone interference of the main shaft and the input shaft of 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 content of the above embodiments to take the inverse three.
In the present specification, the embodiments 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 main shaft comprises a first force application surface and a first connecting and matching surface;
the gear box input shaft comprises a second force application surface and a second connection matching surface, wherein the first connection matching surface and the second connection matching surface are in interference fit; and
and the axial pretension tension structure is configured to penetrate through the main shaft from the first force application surface and penetrate through the second force application surface.
2. The fan main shaft connecting structure according to claim 1, wherein the axial pretension structure is a locking bolt so that the first force application surface and the second force application surface are as close as possible.
3. The fan main shaft connecting structure according to claim 1, wherein the main shaft includes a first hollow cylindrical section and a second hollow cylindrical section which are concentric, and a platform section which connects the first hollow cylindrical section and the second hollow cylindrical section to form a wedge-shaped section.
4. The wind turbine main shaft connecting structure according to claim 3,
the outer diameter of the first hollow cylindrical section is greater than the outer diameter of the second hollow cylindrical section so that the platform section forms an outer wedge-shaped platform, and the second force application surface is opposite to the outer wedge-shaped platform.
5. The wind turbine main shaft connecting structure according to claim 4,
the inner diameter of the first hollow cylindrical section is larger than that of the second hollow cylindrical section, so that the platform section forms an inner wedge-shaped platform, and the first acting surface is positioned on the inner wedge-shaped platform.
6. The wind turbine main shaft connecting structure according to claim 5, further comprising:
an inner ring bushing configured to have an interference fit with an inner diameter of the second hollow cylindrical section;
wherein the center of the inner ring bushing is also provided with a lightening hole.
7. The main shaft connecting structure of a wind turbine according to claim 5, wherein the outer side surface of the second hollow cylindrical section is a tapered surface, the outer diameter of the second hollow cylindrical section is gradually reduced from the root at the outer wedge-shaped platform to the tail end, and the inner diameter of the second hollow cylindrical section is kept constant.
8. The main shaft connecting structure of the wind turbine according to claim 7, wherein the input shaft of the gear box includes a third hollow cylindrical section, the second force application surface is located at a top end of the third hollow cylindrical section, the top end of the third hollow cylindrical section faces the outer wedge-shaped platform, and an inner side surface of the third hollow cylindrical section is a second connecting matching surface.
9. The main shaft connecting structure of a wind turbine according to claim 8, wherein the inner side surface of the third hollow cylindrical section is a tapered surface, the inner diameter of the third hollow cylindrical section gradually decreases from the top end to the tail end, and the outer diameter of the third hollow cylindrical section remains unchanged.
10. Fan shaft connection according to claim 9,
the outer axial tangent of the second hollow cylindrical section and the inner axial tangent of the second hollow cylindrical section form an included angle of 0-20 degrees;
the outer axial tangent of the third hollow cylindrical section and the inner axial tangent of the third hollow cylindrical section form an included angle of 0-20 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221752119.0U CN218235874U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221752119.0U CN218235874U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218235874U true CN218235874U (en) | 2023-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221752119.0U Active CN218235874U (en) | 2022-07-08 | 2022-07-08 | Main shaft connecting structure of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218235874U (en) |
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2022
- 2022-07-08 CN CN202221752119.0U patent/CN218235874U/en active Active
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